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Preprint REVIEW | doi:10.20944/preprints201610.0098.v1

Quasicrystals and Other Aperiodic Structures in Mineralogy

Carlos M. Pina, Victoria López-Acevedo

Subject: Engineering, Mining And Mineral Processing Keywords: quasicrystals; aperiodic mineral structures; crystal and quasicrystal morphologies; quasicrystalline minerals; skutterudite; cobaltine

Online: 24 October 2016 (04:59:48 CEST)

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Preprint ARTICLE | doi:10.20944/preprints201611.0083.v3

A Semi-empirical Model of Air Waves Induced by Falling Rock in a Closed Goaf

Fengyu Ren, Yang Liu, Jianli Cao, Rongxing He, Yuan Xu, Xi You, Yanjun Zhou

Subject: Engineering, Mining And Mineral Processing Keywords: air waves; falling rock; semi-empirical model; uniform motion phase; acceleration movement phase

Online: 25 January 2017 (03:46:33 CET)

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Preprint ARTICLE | doi:10.20944/preprints201802.0173.v1

Quick, Easy and Economic Mineralogical Studies of Flooded Chalk for EOR Experiments Using Raman Spectroscopy

Laura Borromeo, Nina Egeland, Mona Wetrhus Minde, Udo Zimmermann, Sergio Andò, Merete Vadla Madland, Reidar Inge Korsnes

Subject: Engineering, Mining And Mineral Processing Keywords: flooded chalk; Raman spectroscopy; enhanced oil recovery; carbonates; calcite; magnesite

Online: 27 February 2018 (04:59:33 CET)

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Preprint ARTICLE | doi:10.20944/preprints201711.0179.v1

Experimental Study on Methane Desorption with the Coupling Effects of High Pressure Water and Thermal

Dong Zhao, Dayuan Li, Yulin Ma, Zengchao Feng, Yangsheng Zhao

Subject: Engineering, Mining And Mineral Processing Keywords: methane; desorption; water injection; thermal

Online: 28 November 2017 (06:51:19 CET)

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Working Paper ARTICLE

Did Biology Emerge from Biotite in Micaceous Clay?

Helen Greenwood Hansma

Subject: Engineering, Mining And Mineral Processing Keywords: clay; mica; biotite; muscovite; origin of life; abiogenesis; mechanical energy; work; wet-dry

Online: 5 November 2020 (10:43:44 CET)

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Preprint REVIEW | doi:10.20944/preprints201810.0183.v1

Catalytic/Protective Properties of Martian Minerals and Implications for Possible Origin of Life on Mars

Teresa Fornaro, Andrew Steele, John Robert Brucato

Subject: Engineering, Mining And Mineral Processing Keywords: Mars; minerals; biomarkers; catalysis; preservation; ionizing radiations

Online: 9 October 2018 (10:01:26 CEST)

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Preprint REVIEW | doi:10.20944/preprints202304.0811.v1

Grinding Media in Ball Mills-A Review

Nyasha Matsanga, Willie Nheta, Ngonidzashe Chimwani

Subject: Engineering, Mining And Mineral Processing Keywords: Grinding media, ball mill, comminution, Ball size distribution, wear, alloy, cast iron

Online: 24 April 2023 (03:37:13 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202305.1429.v1

UAV Based 3D Photogrammetric Modelling in Underground Inaccessible Tunnel

Baterdene Bibish, Hisatoshi Toriya, Yewuhalashet Fissha, Hajime Ikeda, Narihiro Owada, Brian Bino Sinaice, Tsuyoshi Adachi, Youhei Kawamura

Subject: Engineering, Mining And Mineral Processing Keywords: UAV; 3D; modelling; photogrammetric; image processing; underground; tunnel

Online: 19 May 2023 (10:22:51 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202306.0891.v1

Enhancing Rock Fragmentation Assessment in Mining Blasting through Machine Learning Algorithms: An Effective Approach

Angesom Gebretsadik, Rahul Kumar, Hajime Ikeda, Mujahid Ali, Yewuhalashet Fissha, Arvind Kumar Mishra, Yemane Kide, Mohammed Mnzool, Enas Ali, E. E. Gomaa

Subject: Engineering, Mining And Mineral Processing Keywords: Fragmentation; Artificial neural network; Random Forest regression; Support vector regression; XG Boost Regression; Sensitivity analysis

Online: 13 June 2023 (08:04:17 CEST)

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In a limestone quarry mine, fragmentation is a crucial outcome of blasting operations. The optimization of blasting operations greatly benefits from the prediction of rock fragmentation. The main factors that affect fragmentation are rock mass characteristics, blast geometry, and explosive properties. This paper is a step towards the implementation of machine learning and deep learning algorithms for predicting the extent of fragmentation (in percentage) in opencast mining. Various parameters can affect fragmentation. But, in this paper initially, ten parameters (spacing, drill hole diameter, burden, average bench height, powder factor, number of holes, charge per delay, uniaxial compressive strength, specific drilling, and stemming) are collected to train the model. However, due to a weak correlation with rock fragmentation, drill diameter, Average bench height, compressive strength, stemming, and charge per delay are eliminated to reduce model complexity. A total of 219 data sets having five input features i.e., the number of holes, spacing, burden, specific drilling, and powder factor are used to develop the models. To predict rock fragmentation due to blasting in limestone quarry mines, both machine learning models (Random Forest Regression (Bagging), Support Vector Regression, and XG Boost Regression (Boosting)), as well as a deep learning model (Neural Network Regression), are applied to develop a model that can optimize the prediction of fragmentation. The Artificial neural network model optimization showed that the model with architecture 64-32-16-1 can perform well giving MSE (mean squared error) values of 41.32 and 28.59 on training and test data respectively. The R2 value for both training and test is 0.83. Random Forest regression is also performing well compared to SVR and XG boost with the MSE value 12.37 and 9.89 on training and testing data respectively. Here, the R2 value for both sets are 94%. Based on the permutation importance and Shapely plot values, the powder factor has the highest impact, and the burden has the lowest impact on fragmentation.

Preprint ARTICLE | doi:10.20944/preprints202307.1348.v1

Extensive Validation of a New Rock Breakage Test

Marcos De Paiva Bueno, Thiago Almeida, Malcolm S. Powell

Subject: Engineering, Mining And Mineral Processing Keywords: Geometallurgy; comminution; ore characterization; variability; breakage test

Online: 20 July 2023 (08:34:45 CEST)

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Preprint REVIEW | doi:10.20944/preprints202307.1132.v1

A Review on Dimension Stone Extraction Methods

Anjula Buddhika Nayomi Dassanayake, Anjana Udara Samarakoon, Samarasuriya Patabendige Chaminda, Chulantha Lakmal Jayawardena, Yasanga Suduweli Kondage, Kannangara Appuhamilage Tharindu Theekshana Kannangara

Subject: Engineering, Mining And Mineral Processing Keywords: Diamond saw cutters; Diamond wire cutting; Dimension stones; Expansive mortar; Mining Engineering; Natural stone extraction

Online: 18 July 2023 (10:39:54 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202301.0119.v1

First-principles Calculation of In and Ag, Cu Replacing Zn in Sphalerite

Fan Xiao, Weipeng Lin

Subject: Engineering, Mining And Mineral Processing Keywords: sphalerite; first principle; indium enrichment mechanism; copper; silver

Online: 6 January 2023 (06:54:27 CET)

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Preprint REVIEW | doi:10.20944/preprints202310.2059.v1

Mineral Characterization using Scanning Electron Microscopy (SEM): A Review of the Fundamentals, Advancements, and Research Directions

Asif Ali, Ning Zhang, Rafael M. Santos

Subject: Engineering, Mining And Mineral Processing Keywords: Scanning electron microscopy; Minerals; Artificial Intelligence; Machine Learning; Energy-dispersive spectrometer; Backscattered electron imaging; Secondary electron imaging

Online: 31 October 2023 (09:54:18 CET)

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Preprint ARTICLE | doi:10.20944/preprints202308.0892.v1

Application of Artificial Intelligence Technique and Multi-Objective Grasshopper Optimization Algorithm for Mine-to-Crusher Optimization in Surface Mines

Shahab Hosseini, Masoud Monjezi

Subject: Engineering, Mining And Mineral Processing Keywords: Mining Cost; Fly-Rock; Back-Break; Grasshopper Optimization Algorithm; Artificial Neural Network

Online: 11 August 2023 (08:36:01 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202310.0492.v1

The Hydrological Impacts of Large-Scale Mining Operations: A Social and Environmental Perspective

Katherine Arenas-Collao, Héctor Valdés-González

Subject: Engineering, Mining And Mineral Processing Keywords: Sustainability; Communities; Engagement; Social perspectives; Water stewardship

Online: 9 October 2023 (14:43:32 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202306.0615.v1

Assessment of Charge Initiation Techniques Effect on Blast Fragmentation and Environmental Safety: An Application of WipFrag Software

Blessing Olamide Taiwo, Yewuhalashet Fissha, Thomas Palangio, Andrew Palangio, Hajime Ikeda, N.Rao Cheepurupalli, Naseer Muhammad Khan, Adams Abiodun Akinlabi, Oluwaseun Victor Famobuwa, Joshua Oluwaseun Faluyi, Youhei Kawamura

Subject: Engineering, Mining And Mineral Processing Keywords: marble; small-scale mining; blast impact; fragments size characterization; WipFrag,

Online: 8 June 2023 (09:44:49 CEST)

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Preprint REVIEW | doi:10.20944/preprints202305.0725.v1

A Brief Review on Micro-particle Slurry Rheology in Grinding and Flotation for Enhancing Fine Mineral Processing Efficiency

Guangsheng Zeng, Yangge Zhu, Wei Chen

Subject: Engineering, Mining And Mineral Processing Keywords: slurry rheology; froth rheology; grinding; flotation; fine particle

Online: 10 May 2023 (09:55:32 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202401.0650.v1

IOTA-Based Distributed Ledger in the Mining Industry: Efficiency, Sustainability and Transparency

Nenad Gligorić, David Escuín, Lorena Polo, Angelos Amditis, Tasos Georgakopoulos, Alberto Fraile

Subject: Engineering, Mining And Mineral Processing Keywords: Blockchain; IOTA; Industry 4.0; Mining, Internet of Things, Trust

Online: 8 January 2024 (16:13:55 CET)

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Preprint ARTICLE | doi:10.20944/preprints202307.1898.v1

The Impact of Pulp Temperature on the Water Chemistry and Flotation Performance

Ozlem Bicak, Ertuna Cakir, Seda Ozcelik, Zafir Ekmekci

Subject: Engineering, Mining And Mineral Processing Keywords: Flotation; sulfide ores; water chemistry, temperature; statistical experimental design

Online: 27 July 2023 (09:52:04 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202305.0516.v1

Context-Based Synthesis of Unmeasurable Signals before Attenuation in Line-Scan X-ray Transmission

Tianzhong Xiong, Wenhua Ye

Subject: Engineering, Mining And Mineral Processing Keywords: context-based synthesis of unmeasurable signal; line-scan dual-energy X-ray transmission; vertical and horizontal anisotropy; difference of synthesis; real-time

Online: 8 May 2023 (10:28:04 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202307.1631.v1

Hybrid Model for Optimisation of Waste Dump Design and Site Selection

Aleksandar Doderovic, Svetozar-Milan Doderovic, Sasa Stepanovic, Mirjana Bankovic, Dejan Stevanovic

Subject: Engineering, Mining And Mineral Processing Keywords: waste dump design and site selection; hybrid model; optimisation; genetic algorithm

Online: 24 July 2023 (16:50:56 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202308.0753.v1

Ceramic Grinding Kinetics of Fine Magnetite Ores in the Batch Ball Mill

Chengfang Yuan, Caibin Wu, Li Ling, Xin Yao, Zheyang Li, Feng Xie, Jingkun Tian

Subject: Engineering, Mining And Mineral Processing Keywords: grinding kinetics; PBM; magnetite; breakage rate; zero-order output

Online: 10 August 2023 (05:02:33 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202310.1960.v1

Comprehensive Research of Construction and Stability of Horizontal-Well Cavity Natural Gas Storage in Thinly-Bedded Salt Rocks in China

Dan Lu, Jie Chen, Fei Wu, Deyi Jiang, Wei Liu, Bowen Ding, Xinyu Luo, Yanfei Kang, Yi He

Subject: Engineering, Mining And Mineral Processing Keywords: natural gas storage; bedded salt rock; multi-stage horizontal cavity leaching; nitrogen cushion

Online: 31 October 2023 (02:58:34 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.1063.v1

An Innovative Magnetic Density Separation Process

Lin Wang, Peter Rem, Francesco Di Maio, Max Van Beek, Gonçalo Tomás

Subject: Engineering, Mining And Mineral Processing Keywords: magnetic density separation; magnetic fluid; granular sorting; particle sliding phenomenon; solid waste; wasted PCBAs; wasted wires

Online: 19 March 2024 (06:59:37 CET)

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Preprint ARTICLE | doi:10.20944/preprints202311.1074.v1

Mining and Mineral Processing Journals in the WoS and Their Rankings When Merging SCIEx and ESCI Databases—Case Study Based on the JCR 2022 Data

Tomislav Korman, Tomislav Malvić, Vasyl Lozynskyi, Zlatko Briševac, Zoran Kovač, Lidia Hrnčević, Krešimir Pavlić

Subject: Engineering, Mining And Mineral Processing Keywords: Mining and Mineral Processing journals; WoS; SCIEx; ESCI; ranking

Online: 16 November 2023 (09:43:59 CET)

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Preprint ARTICLE | doi:10.20944/preprints202308.1190.v1

Supplementary Relationship between Circulating Load and Classification Efficiency in Closed Circuit Ball Mills

Chengfang Yuan, Caibin Wu, Li Ling, Xin Yao, Zheyang Li, Feng Xie, Jingkun Tian

Subject: Engineering, Mining And Mineral Processing Keywords: Closed circuit ball mill; circulating load; classification efficiency; relative capacity of ball mills; industrial applications

Online: 16 August 2023 (09:55:30 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202306.1208.v1

An Investigation of Approaches for Enhanced Reverse Flotation of Refractory Hematite Ore

Zhongxian Wu, Hao Huang, Huaizhi Shao, Dongping Tao, Youjun Tao

Subject: Engineering, Mining And Mineral Processing Keywords: process mineralogy; hematite; quartz; reverse flotation; flotation mechanisms

Online: 16 June 2023 (10:00:33 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202309.1158.v1

Derivation Of KCl from Potassium Feldspar via Varied Salts

Tülay Türk, Murat Olgaç Kangal

Subject: Engineering, Mining And Mineral Processing Keywords: potassium feldspar; potassium chloride; calcium chloride; sodium chloride; calcium sulfate

Online: 19 September 2023 (04:30:16 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202306.0236.v1

Research on Optimization and Numerical Simulation of Layout Scheme of Mining Approach in Downward Slicing and Filling Method

Kui Zhao, Nan Liang, Peng Zeng, Wanyin Wang, Cong Gong, Liangfeng Xiong, Hao Liu

Subject: Engineering, Mining And Mineral Processing Keywords: Downward slicing and filling method; The weak filling surface; Route arrangement; Numerical simulation

Online: 5 June 2023 (04:44:34 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202309.1872.v1

Alkaline Leaching for Arsenic Removal in Gold-Bearing Ore from Miraflores Mine, El Oro, Ecuador

Washington Epinoza-Ramón, Oscar Reyes-Rodríguez, Elizabeth Peña Carpio, Samantha Jiménez-Oyola, Kenny Escobar-Segovia, Juan M Menendez-Aguado, Daniela Paz Barzola

Subject: Engineering, Mining And Mineral Processing Keywords: arsenic removal; alkaline leaching; gold-bearing material

Online: 27 September 2023 (14:50:50 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202306.1072.v1

Landscape Evolution Modelling of a Post-mining Catchment for Long-term Simulations

Devika Nair, Dr.Ken Evans, Dr.Sean Bellairs

Subject: Engineering, Mining And Mineral Processing Keywords: Landform evolution modelling; catchment hydrology; post-mining landscape; sediment transport; mine rehabilitation

Online: 15 June 2023 (05:08:13 CEST)

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Landform Evolution Modelling (LEM) provides an avenue for simulating how a landscape may evolve over extended time periods of thousands of years. The CAESAR-Lisflood LEM that includes a hydrologic model (TOPMODEL) and a hydraulic model (Lisflood) can be used to assess the proposed final landform morphology of a mine site by simulating how the mine landform and the landscape would evolve over a 1,000-year period. The accuracy of future simulations depends on the calibration and validation of the model to the past and present events. Calibration and validation of the model involves finding a combination of parameters of the model which when applied and simulated gives model outputs similar to those observed for the real site scenario for corresponding input data. Calibrating the sediment output of the CAESAR-Lisflood model at the catchment level and using it for studying the equilibrium conditions of the landform is an area yet to be explored. Therefore, the aim of this study was to calibrate the CAESAR-Lisflood model and then validate it. To achieve this, the model was run for a rainfall event with a set of parameters, plus discharge and sediment data for the input point of the catchment, to analyze how similar the model output would behave when compared with the discharge and sediment data for the output point of the catchment. The model parameters were then adjusted until the model closely approximate the real site values of the catchment. It was then validated by running the model for a different set of events and checking that the model gave similar results to the real site values. The outcomes demonstrated that while the model can be calibrated to a greater extent for hydrology (discharge output) throughout the year, the sediment output calibration may be slightly improved by having the ability to change parameters to take into account the seasonal vegetation growth during the start and end of the wet season. This study is important for designing and testing post-mining rehabilitated landscape systems that assess hydrology and sediment movement in seasonal biomes.

Preprint ARTICLE | doi:10.20944/preprints202307.0184.v1

A Stope Mining Design with Consideration of Hanging Wall When Transitioning from Open Pit Mining to Underground Mining for Sepon Gold Mine Deposit, Laos

Seelae Phaisopha, Hideki Shimada, Takashi Sasaoka, Akihiro Hamanaka, Phanthoudeth Pongpanya, Seva Shorin, Khounma Senthavisouk

Subject: Engineering, Mining And Mineral Processing Keywords: open pit slope stability; finite element analysis; generalized Hoek-Brown criterion; underground stopping stability; surface subsidence

Online: 4 July 2023 (09:32:14 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202402.0351.v1

The Influence of Explosive and Rock Mass Properties on Blast Damage in a Single-Hole Blasting

Magreth Sungwa Dotto, Yashar Pourrahimian

Subject: Engineering, Mining And Mineral Processing Keywords: Blast fragmentation; numerical simulation; rock mass properties; explosive properties; rock damage

Online: 6 February 2024 (09:42:33 CET)

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Preprint ARTICLE | doi:10.20944/preprints202312.0129.v1

Effect of an Environment-Friendly Depressant on the Flotation of Bastnaesite and Fluorite

Chunlei Guo, Shaochun Hou, Weiwei Wang, Qiang Li

Subject: Engineering, Mining And Mineral Processing Keywords: Bastnaesite; Fluorite; Sodium alginate; Flotation

Online: 5 December 2023 (06:11:00 CET)

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Preprint ARTICLE | doi:10.20944/preprints202306.2097.v1

Rock Classification Using a Vibration Signal in the Process of Rotary Drilling

Beáta Stehlíková, Gabriela Bogdanovská, Patrik Flegner, Rebecca Frančáková, Ladislav Drančák

Subject: Engineering, Mining And Mineral Processing Keywords: rotary drilling, rock classification, vibration signal, cluster dendrogram, machine learning, the decision tree classifier

Online: 29 June 2023 (11:07:47 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202306.0656.v1

Simulation of the Damage and Failure Characteristics of Coal under True Triaxial Static-Dynamic Loads

Hu He, Siyuan Gong, Xuwei Li, Zonglong Mu

Subject: Engineering, Mining And Mineral Processing Keywords: rockburst; true triaxial; numerical simulation; static-dynamic loads; damage evolution

Online: 9 June 2023 (03:51:39 CEST)

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Preprint COMMUNICATION | doi:10.20944/preprints202309.0128.v1

Investigation on the Adsorption Mechanism of a Noval Collector Cetyl Trimethyl Ammonium Chloride on the Surface of Hematite and Quartz

Haoran Sun, Yulian Wang, Jin Yao, Wanzhong Yin

Subject: Engineering, Mining And Mineral Processing Keywords: Hematite; Quartz; Cetyl trimethyl ammonium chloride; Selective adsorption; Flotation separation

Online: 4 September 2023 (07:21:40 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202307.0388.v1

Study on Electrochemical Behavior of Pyrite Oxidation in Alkaline Electrolyte

Yehao Huang, Zipei Jia, Wen Wang, Jia Yao, Runbo Gao, Laifu Xu, Hongtao Zhang, Yongsheng Zhang, Xiangyu Song

Subject: Engineering, Mining And Mineral Processing Keywords: Pyrite; Alkaline oxidation; Electrochemical technique; Surface passivation

Online: 6 July 2023 (09:09:16 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202306.1581.v1

Liquid-solid Coupling Simulation Experiment on Distribution Law of Water-conducted Fracture in Weakly Cemented Over-burden Strata -------- Exemplified by Daliuta Coal Mine in West-ern China

Yangyang Li, Shichuan Zhang, Xuexian Han, Weihong Yang, Junxi Liu, Shilong Song

Subject: Engineering, Mining And Mineral Processing Keywords: Weakly cemented strata, distribution of fractures in overburden strata, evolution of water pas-sage; pore water pressure, physical simulation

Online: 21 June 2023 (16:45:47 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202310.0110.v1

The Impact of Restricting the Air Intake in Self-Aspirated Flotation Cells at Los Pelambres Concentrator

Michel Morales Gacitúa, Miguel Maldonado Saavedra, Luis Vinnett

Subject: Engineering, Mining And Mineral Processing Keywords: Self-aspirated flotation cells; WEMCO cells; flotation banks; air restriction

Online: 3 October 2023 (07:19:53 CEST)

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This article describes the impact of restricting the air intake in industrial 250 m3 WEMCO flotation cells at Los Pelambres concentrator. The influence of this air restriction on the hydrodynamic and metallurgical performance of this type of machine was evaluated. The experiments were conducted in single flotation cells and in entire rougher banks. In all cases, the gas holdup was measured to estimate the effectiveness of the obstruction system to decrease the air concentration. In single cells, axial profiles for solid percentage and particle size were evaluated. In addition, a mass balance was conducted to assess the copper recovery and concentrate features. In individual cells, the air restriction led to a decrease in the gas holdup. However, this slight change was enough to obtain a more stable froth zone and a better solids suspension. The latter was observed as a higher P80 below the pulp-froth interface, a less diluted pulp at this level, a slightly higher Cu recovery, and a coarser concentrate product. A mineralogical analysis of the concentrate sample also showed the presence of coarser liberated Cu-sulfide particles. The results in single cells suggested an improvement in the recovery of coarse particles by a more intense solids suspension. The air intake was also restricted in 3 rougher banks to assess the impact of the air obstruction on the overall performance of the respective circuit. Eleven out of fourteen cells were operated with air restriction, which led to a significant recovery improvement of 0.9%-1.6% (absolute) with a 95% confidence level. Size-by-size mass balances were also conducted for the rougher circuits, which proved that the recovery improvements were justified by the simultaneous increase in the recovery of coarse and fine particles. Thus, a restriction of the air intake showed that the decrease in the gas holdup (and in the bubble surface area flux) was compensated by a better solids suspension and a higher turbulence in the impeller. The former promotes the recovery of coarse particles, whereas the latter improves the interaction between bubbles and fine particles. Further developments are being made to implement a regulatory control strategy to control the air intake in self-aspirated flotation cells, and to use this approach for optimizing industrial flotation banks.

Preprint ARTICLE | doi:10.20944/preprints202310.1122.v1

Unveiling the Diagenetic and Mineralogical Impact on the Carbonate Formation of the Indus Basin, Pakistan: Implications for Reservoir Characterization and Quality Assessment

Faisal Hussain Memon, Abdul Haque Tunio, Khalil Rehman Memon, Aftab Ahmed Mahesar, Ghulam Abbas

Subject: Engineering, Mining And Mineral Processing Keywords: carbonate formation; mineralogy; diagenesis; petrophysical properties; stress sensitivity; reservoir quality

Online: 18 October 2023 (09:43:00 CEST)

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The Chiltan Formation is a potential hydrocarbon-producing reservoir in the Indus Basin, Pakistan. However, its diagenetic alterations and heterogeneous behavior lead to significant challenges in accurately characterizing the reservoir and production performance. This manuscript aims to utilize Chiltan Limestone core samples to conduct a detailed analysis of the diagenetic impacts on reservoir quality. The formation evaluation was carried out through thin section analysis, SEM-EDS and FTIR investigation, as well as plug porosity and permeability measurements under different stress conditions. In results, Petrography revealed three microfacies with distinct diagenetic features and micro-nano fossil assemblages, including intraclasts, pelloids, bioclasts, and stylolites. Diagenesis has a significant impact on petrophysical properties, leading to increased reservoir heterogeneity. The specified depositional environment exposed the alteration of the Chiltan formation during distinct diagenetic phases in marine, meteoric, and burial settings. Pore morphology and mineralogy reveals complex micro-pore structure with various carbonate mineral phases and cement types in the formation samples. The average porosity and permeability of the core samples were found to be 3.4% and 0.449 mD respectively, indicating poor reservoir quality. Stress sensitivity was determined using Klinkenberg corrected permeability, which indicated a reduction in measured and absolute permeability due to increasing confining stress, further reducing the pore throat structure of the formation. In conclusion, the Chiltan formation possesses intricate reservoir heterogeneity and varied micro-pore structure caused by diagenesis and depositional settings. The formation is classified as a low-quality reservoir due to its non-uniform pore geometry, which exhibits low petrophysical properties resulting from overburden stress. The results of this study provide solid foundation in reservoir characterization and quality assessment which has implications for exploring and exploitation of indigenous resources.

Preprint CASE REPORT | doi:10.20944/preprints202311.1189.v1

Petrographic and Geotechnical Study of Aggregates from the Alfallé Magmatic and Metamorphic Massif (Central Chad )

Hamid Zagalo Al-hadj, Pierre Rochette, Annour Birké Allafouza

Subject: Engineering, Mining And Mineral Processing Keywords: Chad; granites; gneiss; petrography; geotechnics; aggregates

Online: 20 November 2023 (10:47:45 CET)

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Preprint ESSAY | doi:10.20944/preprints202308.1844.v1

Experimental Study of the Mechanical and Acoustic Emission Characteristics of Sandstone by Using High-Temperature Water-Cooling Cycles

Wen Wang, Lei Hong, Xuewen Cao, Xiaowei Lu, Fan Wang, Tong Zhang, Weibing Zhu

Subject: Engineering, Mining And Mineral Processing Keywords: rock mechanics; high-temperature water-cooling cycle; uniaxial compression; acoustic emission characteristics

Online: 29 August 2023 (03:36:33 CEST)

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Preprint REVIEW | doi:10.20944/preprints202403.0079.v1

A Review of Orebody Knowledge Enhancement using Machine Learning on Open Pit Mine Measure-While-Drilling Data

Daniel Goldstein, Chris Aldrich, Louisa O'Connor

Subject: Engineering, Mining And Mineral Processing Keywords: Measure While Drilling (MWD); Open-pit mining; Subsurface characterization; Machine Learning (ML); Data acquisition; Rock properties; Geochemical analysis; Artificial Intelligence (AI); Predictive modeling; Feature Importance

Online: 4 March 2024 (09:29:05 CET)

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Preprint CASE REPORT | doi:10.20944/preprints202311.1189.v2

Petrographic and Mechanical Study of Aggregates from Central Chad: a case for Natural Selection of hard rocks

Hamid Zagalo Al-hadj, Pierre Rochette, Annour Birké Allafouza

Subject: Engineering, Mining And Mineral Processing Keywords: Chad; granites; gneiss; petrography; geotechnics; aggregates

Online: 2 January 2024 (07:55:29 CET)

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Preprint ARTICLE | doi:10.20944/preprints202307.0450.v1

Optimal Layout Methods of Deep Chamber for Coal-gangue Separation Based on the Horizon of the Weak Stratum

Cheng Zhu, Yong Yuan, Hanqing Sun, Zhongshun Chen, Wenmiao Wang

Subject: Engineering, Mining And Mineral Processing Keywords: coal-gangue separation chamber; structure characteristics; weak-stratum horizon; deformation and failure law; optimal layout methods

Online: 7 July 2023 (08:58:37 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202310.1341.v1

Mine Productivity Upper Bounds and Truck Dispatch Rules

Adriano Chaves Lisboa, Felipe Luz Barbosa Castro, Pedro Vinícius Almeida Borges de Venâncio

Subject: Engineering, Mining And Mineral Processing Keywords: mine productivity; upper bound; truck dispatch rule

Online: 23 October 2023 (05:42:19 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202312.2231.v1

Study on the Separation and Mixing Characteristics of Wide-Grained Dense Medium in Vibration Separation Fluidized Bed

Ruikang Fan, Zhibin Guo, Ziyi Guo, Ronmiao Zhang, Yifan Wang, Sai Xiong

Subject: Engineering, Mining And Mineral Processing Keywords: Vibrated fluidized bed; Fine coal; Mixing characteristic; Separation characteristics

Online: 29 December 2023 (11:29:08 CET)

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Preprint ARTICLE | doi:10.20944/preprints202401.1084.v2

Preparation and corrosion resistance of Zn-Y₂O₃-Al₂O₃ nanocomposite coatings fabricated via electrodeposition

Xiujuan Feng, Falong Qiu, SEKOU MOHAMED CONDE, Chengliang Dong Dong

Subject: Engineering, Mining And Mineral Processing Keywords: Electrodeposition; Zn-Y₂O₃-Al₂O₃; Nanocomposite; Corrosion; Microhardness

Online: 16 January 2024 (06:25:46 CET)

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Preprint ARTICLE | doi:10.20944/preprints202312.0862.v1

Characteristics of Electrical Resistance Alteration during In-Situ Leaching of Ion-Adsorption Type Rare Earth Ore

Xiujuan Feng, Xiaoqing Wang

Subject: Engineering, Mining And Mineral Processing Keywords: ion-adsorption type rare earth; in-situ leaching; electrochemical impedance spectroscopy; electrical resistance; equivalent circuit model

Online: 12 December 2023 (13:14:24 CET)

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Preprint ARTICLE | doi:10.20944/preprints202310.2038.v1

Shaft Wall Damage of High Depth Inclined Ore-Pass under Impact Wear Behavior

Lichun Jiang, Haoyu Ji, Luanluan Xue

Subject: Engineering, Mining And Mineral Processing Keywords: Shaft wall damage model; High depth inclined ore-pass; Ore-pass structure parameters; Ore block size; Impact wear behavior

Online: 31 October 2023 (09:04:53 CET)

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Preprint ARTICLE | doi:10.20944/preprints202310.1700.v1

Study on the Mechanism of Gas Intrusion and Its Transportation in Wellbore Under Shut-In Conditions

Haifeng Zhu, Ming Xiang, Jicheng Yang, Xuerui Wang, Xueqi Liu, Zhiyuan Wang

Subject: Engineering, Mining And Mineral Processing Keywords: offshore well drilling; gas intrusion rate; bubble initial size; bubble transport velocity

Online: 26 October 2023 (11:05:34 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202403.0128.v1

Mechanical Model and Finite Element Analysis of Concrete False Roof in Downward Approach Type Infill Quarry

HAO LI, HONGJIANG WANG, CHUNKANG LIU

Subject: Engineering, Mining And Mineral Processing Keywords: concrete false roof; thin slab theory; ultimate strength; thickness; downward approach infill mining method

Online: 4 March 2024 (10:58:01 CET)

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Concrete is more stable than filler as a false roof in a downward approach type infill quarry, but the mechanical model of a concrete false roof is not clear. As a result, there has been limited application. Therefore, it is necessary to establish the mechanical model of a concrete artificial false roof to enhance the stability of the downward approach infill quarry. This paper combines theoretical analysis, model derivation, finite element analysis and field application methods. Firstly, the basic assumptions of thin plate theory and elasticity mechanics are used as the premise to establish the differential equations of the deflection curve of the concrete thin plate false roof. Then, the three types of bending moment generation of the concrete thin plate false roof are explored. Secondly, the relationship between the location of dangerous surface and dangerous point in hard-supported weak-slab structure and soft-supported weak-slab structure is analyzed, and the type of uniform load and calculation model of concrete thin-slab false roof are improved. Finally, according to the established mechanical model of thin slab false roof, finite element analysis and field application were carried out. The results show that there are three types of deflection curve differential equations in the concrete thin slab false roof perpendicular to the strike, and three extreme points exist in the middle section of the thin slab and on both sides of the surrounding rock. The hazardous surface of the hard-supported weak-slab structure is present at the intersection of the encircling rock and the thin-slab fake ceiling, with the perilous point situated on the top of this surface. The hazardous surface of the soft-supported weak-slab structure can be found in the centre section of the thin-slab fake ceiling, with the perilous point being located at the bottom of this surface. Moreover, the damage mode for both structures is that of maximum tensile stress damage. Upon conducting a finite element analysis, the results indicate that the concrete's maximum tensile stress is significantly high.

Preprint ARTICLE | doi:10.20944/preprints202309.0381.v1

Study on Thermal Crack Characteristics of Granite in Shandong Province, China under Different Temperatures and Heating/Cooling Treatments

Weiqiang Zhang, Wei Li, Xin Zhang, Wei Qiao, Yangzhou Wang, Jinyu Xie

Subject: Engineering, Mining And Mineral Processing Keywords: granite; thermal crack; high temperature; heating/cooling path; crack mechanism

Online: 6 September 2023 (10:07:27 CEST)

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Understanding the thermal cracks of rock caused by high temperature is of great help to the development of underground engineering, such as geothermal mining, underground coal gasification. Although there has been many study on thermal cracking, it is not systematic and in-depth enough. In order to deeply study the thermal crack mechanism of rock, this paper conducted thermal cracking experiments on granite at different temperatures and heating/cooling paths, and qualitative and quantitative analysis was conducted on the crack initiation characteristics, propagation paths, and crack network morphology of rock thermal crack under different test conditions. The thermal crack mechanism was also analyzed from the perspectives of mineral petrology, fracture mechanics, thermodynamics, and other aspects. The research results show that there are two obvious mutation points in the study temperature range for samples with fast cooling paths (SF path: slow heating and fast cooling; FF path: fast heating and fast cooling), around 200-300 ℃ and 600 ℃, respectively, while for samples with slow cooling paths (SS path: slow heating and slow cooling; FS path: fast heating and slow cooling), there is only one mutation point around 600 ℃. The initiation positions of thermal cracking under all temperature paths are relatively similar, with intergranular crack located between particles at the edge of the sample or intercrystalline crack in the middle of feldspar or quartz aggregates. The initiation temperature of SF and FF path specimens is relatively low compared to SS and FS path specimens, and the number and size of cracks is small. The crack network structure formed by the SF path is the most complex, with the largest crack ratio and cumulative crack length; The crack network structure formed by the FF path is relatively complex, with a larger main crack size but relatively fewer secondary cracks; The FS and SS paths do not form a complex network with good connectivity. The process of thermal crack development can be divided into three stages: the development of small cracks, the joint development of main cracks and small cracks, and the connection of cracks into a network structure. The mechanism of thermal crack propagation is that the expansion and thermal conductivity between different crystals are different. The thermal stress caused by temperature gradient and the tension or shear stress caused by the inconsistent deformation of crystals form stress concentration in weak areas such as particles boundary, cleavage, and original cracks. Firstly, it causes some crystals with smaller strength or less rounded shape to crack, and when the combined stress is large, the cracks will gradually expand along the existing fine cracks. This also explains that the most main cracks of the SF and FF path specimens mainly surround some large mineral aggregates or between particles.

Preprint ARTICLE | doi:10.20944/preprints202309.1230.v1

Multifractal Characteristics of Uranium Grade Distribution and Spatial Regularities in a Sandstone Type Uranium Deposit in Xinjiang, China

Qiue Cai, Kaixuan Tan, Junjie Zhu, Sheng Zeng

Subject: Engineering, Mining And Mineral Processing Keywords: element concentration–area (C-A); multifractal; singularity exponent; uranium ore; uranium distribution characteristic

Online: 19 September 2023 (13:30:31 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202307.1189.v1

Study on Roof Cutting and Pressure Releasing Technology of Roof Blasting

Xiaowu Huang, Jian Guo, Yusong Miao, Xianqi Xie, Yujin Li, Hailiang Wang, Feifei Huang

Subject: Engineering, Mining And Mineral Processing Keywords: Roof-cutting blasting; Pressure-relief blasting; Deep rock mass; Rock burst; Fracture zone

Online: 18 July 2023 (08:06:52 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202306.1691.v1

Influence of Key Strata on the Evolution Law of Mining-induced Stress in the Working Face of Deep and Large-scale Mining

Jianlin Xie, Shan Ning, Weibing Zhu, Xiaozhen Wang, Tao Hou

Subject: Engineering, Mining And Mineral Processing Keywords: key strata; mining-induced stress; DOFS; 3DEC; large-scale mining

Online: 23 June 2023 (14:09:45 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202403.1195.v1

Study On The Damage And Fragmentation Characteristics Of Blasting Ore Rock Based On Different Delay Time Conditions

Jingkun Zhao, Hui Chen

Subject: Engineering, Mining And Mineral Processing Keywords: Electronic detonator; RHT model; precision delay; Rock damage; Mohr-Coulomb criterion

Online: 20 March 2024 (10:19:04 CET)

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Preprint ARTICLE | doi:10.20944/preprints202401.0663.v1

Research on the Strength Damage and Permeability Characteristics of Backfill under the Action of Chlorine Salt Erosion and Dry–Wet Cycles

HAO LI, HONGJIANG WANG, LONGJIAN BAI

Subject: Engineering, Mining And Mineral Processing Keywords: Cemented paste backfill; Chloride salt erosion; Dry-wet cycle; Permeability characteristics

Online: 9 January 2024 (10:31:28 CET)

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Preprint ARTICLE | doi:10.20944/preprints202310.1960.v2

Comprehensive Research on Construction and Stability of Horizontal-Well Cavity Natural Gas Storage in Thinly Bedded Salt Rocks in China

Dan Lu, Jie Chen, Fei Wu, Deyi Jiang, Wei Liu, Bowen Ding, Xinyu Luo, Yanfei Kang, Yi He

Subject: Engineering, Mining And Mineral Processing Keywords: natural gas storage; bedded salt rock; multi-stage horizontal cavity leaching; nitrogen cushion

Online: 14 December 2023 (06:30:02 CET)

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Preprint ARTICLE | doi:10.20944/preprints202310.0342.v1

Carbon Nanocomposite Material Used in Physical Modelling on Overburden Subsidence Process

Jianlin Xie, Shan Ning, Qingdong Qu, Weibing Zhu, Bozhi Zhao, Jialin Xu

Subject: Engineering, Mining And Mineral Processing Keywords: Massive sandstone; Ultra-thick key stratum; Strata movement; mining engineering; Carbon nanocomposite material

Online: 6 October 2023 (11:26:51 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202401.2026.v1

Phosphorus Adsorbed by Hydrochloric Acid Desorption–Activated Red Mud Adsorbents: A Molecular Dynamics Study

Longjiang Li, Zhi wen Yang, Yueqin Qiu, Yalan Wang

Subject: Engineering, Mining And Mineral Processing Keywords: red mud; hydrochloric acid; desorption; density functional theory; molecular dynamics

Online: 29 January 2024 (12:33:32 CET)

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Preprint ARTICLE | doi:10.20944/preprints202310.1707.v1

Uneven Stiffness Coal Seam: A New Structural Factor Prone to Coal Bump Based on Stiffness Theory

Tiewu Tang, Zhigang Deng, Weiguang Reng, Shankun Zhao, Yin Wang, Yang Zhao, Wenxin Li

Subject: Engineering, Mining And Mineral Processing Keywords: coal bump; stiffness theory; failure criterion; stiffness criterion; USCS; HSZ; LSZ; NSC

Online: 26 October 2023 (11:27:22 CEST)

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An analysis of the stiffness theory reveals that coal mass compression bumps occur only when both the failure criterion and the stiffness criterion are simultaneously satisfied. Then a new structural factor called uneven stiffness coal seam structure (USCS) is proposed, which consists of an uneven stiffness coal seam along with continuous roof and floor. The USCS serves the dual functions of pressure concentration and stiffness reduction. The former facilitates stress concentration from the low stiffness zone (LSZ) to the high stiffness zone (HSZ), thus raising the risk (rF) of failure. The latter reduces the stiffness of the surrounding rock of the HSZ, allowing the system to meet the stiffness criterion even with a hard roof, thereby reconciling the contradiction between the stiffness theory and engineering experience and raising the risk (rI) of instability. The HSZ of the USCS, including thinning zones, bifurcating areas, magmatic intrusion areas, and remnant pillar affected areas, is more susceptible to coal bump incidents than a conventional coal seam. Mechanical analysis and simple numerical simulations validate the pressure concentration and stiffness reduction functions of the USCS. The results demonstrate the following: 1) The normal stress of the HSZ positively correlates with ER, HR, KH, and SL, but negatively correlates with KL and SH; The stiffness of surrounding rock of the HSZ negatively correlates with HR, KH, SL, and SH, but positively correlates with ER and KL. 2) Failures within the HSZ of the USCS enables the roof strata to release bending deformation energy without undergoing fracturing. 3) The alignment between the HSZ of an existing USCS and the HSZ of an artificial USCS advancing with the working face intensifies stress concentration and reduces stiffness, thereby significantly increases the risk (rCB) of coal bump. By applying the stiffness theory and relevant USCS findings, new explanations can be provided for engineering phenomena such as the time-delayed coal bumps, the inefficient pressure relief in ultra thick coal seams, and the “microseism deficiency” observed prior to certain coal bumps.

Preprint ARTICLE | doi:10.20944/preprints202310.1958.v1

Aeration Accelerates the Microbial Leaching of Low-Grade Copper Sulfide Ores

Mingqing Huang, Zhaolan Li, Ming Zhang, Weicheng Wang

Subject: Engineering, Mining And Mineral Processing Keywords: bioleaching; forced aeration; airflow; low-grade ores; oxygen concentration

Online: 31 October 2023 (04:29:01 CET)

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Preprint ARTICLE | doi:10.20944/preprints202401.1051.v1

Rainfall-Mining Coupling Effects on Slope Failure Mechanism and Evolution Process: A Case Study of Open-Pit to Underground Mining

Qihang Li, Yunmin Wang, Xiaoshuang Li, Bin Gong

Subject: Engineering, Mining And Mineral Processing Keywords: Rainfall and mining coupling; Open-pit to underground mining; Rock slope; Failure mechanism; Evolution process; Similarity simulation experiment

Online: 15 January 2024 (10:27:35 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.1805.v1

Evalution of the Efficiency of Using an Oxidizer in the Leaching Process of Gold-Containing Concentrate

B.K. Kenzhaliyev, N.K. Tussupbayev, G.Zh. Abdykirova, A.K. Koizhanova, D.Ye. Fischer, Zh.A. Baltabekova, N.O. Samenova

Subject: Engineering, Mining And Mineral Processing Keywords: stale tailings of a processing factory; grinding; centrifugal separation; pyrite; gold; redox 26 potential; thermodynamic analysis; extraction

Online: 29 March 2024 (09:51:30 CET)

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Preprint ARTICLE | doi:10.20944/preprints202310.0133.v1

Energy Accumulation Law of Different Forms of Coal-Rock Com-Binations

Zibo Li, Guohua Zhang, Yubo Li, Wenjun Zhou, Tao Qin, Li Zeng, Gang Liu

Subject: Engineering, Mining And Mineral Processing Keywords: Coal thickness change; Combination; Combined rock strata; Energy accumulation; Rock burst

Online: 3 October 2023 (09:05:37 CEST)

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This paper aims to investigate the coal thickness change area of the combined rock strata energy accumulation law. The method of connecting a uniaxial compression experiment with a theoret-ical analysis is used in this work. We employ a combination of coal and rock to carry out our studies. We investigate how different lithologies and ratios of coal-rock height affect the me-chanical properties of the mixture and the law governing energy accumulation. We have deter-mined the following facts: (1) The combination's peak strength and elastic modulus exceed that of coal and are inferior to that of rock but are nearer to that of coal. (2) When the coal-rock height ratios are dissimilar, the peak strength and modulus of elasticity of the combination show a negative correlation with the coal-thickness share, and the pre-peak energy accumulation and impact energy index of the combination shows a positive correlation with the coal-thickness share. (3) For the combination with the same coal-rock height ratio, the peak strength, elastic modulus, pre-peak energy accumulation, and impact energy index all increase with greater rock strength and elastic modulus. The presence of a hard rock layer affects the accumulation of pre-peak energy. ( 4 ) The stress in the surrounding rock gradually decreases as the coal thick-ness increases. In the area where coal thickness declines, the stress in surrounding rock is higher than that in the region where it thickens. The energy stored in the surrounding rock is directly proportional to the coal in the zone. Conversely, areas with thinner coal deposits exhibit a lower energy storage capacity in the surrounding rock than those with thicker coal deposits. The stress distribution of surrounding rock in coal thickness change is abnormal; substantial energy accu-mulation can swiftly initiate dynamic disasters, such as rock bursts. This study has important reference significance for preventing and controlling rock burst in coal thickness change areas.

Preprint ARTICLE | doi:10.20944/preprints202402.1477.v1

Research on Damage Size Effect of Cemented Paste Backfill under High Sand-Cement Ratio Conditions

HAO LI, HONGJIANG WANG, LONGJIAN BAI

Subject: Engineering, Mining And Mineral Processing Keywords: High sand-cement ratio; Cemented paste backfill; response surface method; size effect

Online: 26 February 2024 (14:36:55 CET)

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To facilitate the computation of the uniaxial compressive strength value of the cemented paste backfill under the condition of high sand-cement ratio, and to analyze the size effect of the cemented paste backfill with high sand-cement ratio under varied aspect ratios, the cemented paste backfill specimens with sand-cement ratios of 8:1-24:1 and aspect ratios of 0.5, 1, and 2 were prepared. Through response surface experiments and finite element analysis, the influence of three aspect ratios on the cemented paste backfill strength was explored, and the failure characteristics and size effect mechanisms of cemented paste backfill with various aspect ratios were analyzed. The model of strength conversion between cemented paste backfill with different aspect ratios was established. The results show that the compressive strength of the cemented paste backfill decreases with the increase of the aspect ratio under the same mass concentration and sand-cement ratio. When the aspect ratio is 0.5 and 1, the splitting failure is the main factor; when the aspect ratio is 2, the shearing failure is the main factor. The three-dimensional stress caused by the end effect of the cemented paste backfill is the main reason for the high strength when the aspect ratio is 0.5. Due to the one-dimensional stress zone generated in the middle of the cemented paste backfill with an aspect ratio of 2 in the laboratory, its strength value is closer to the actual uniaxial compressive strength value of the cemented paste backfill. The strength values of the cemented paste backfill with aspect ratios of 0.5 and 1 were higher than the actual uniaxial compressive strength values in the laboratory. The rationality of the theoretical analysis was verified by the ABAQUS analysis results. According to the experimental results, a strength conversion model between different aspect ratios is established, which can provide a reference for the design of the uniaxial compressive strength of the cemented paste backfill.

Preprint ARTICLE | doi:10.20944/preprints202404.0192.v1

Explicit Numerical Study on Dynamic Behavior of Threadbar under Impact Loading

L.Y. Marulanda, J.A. Vallejos, J.I. Velásquez

Subject: Engineering, Mining And Mineral Processing Keywords: Rockbursts; Threadbar; Dynamic testing; Numerical modelling; energy absorption

Online: 2 April 2024 (10:26:04 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202403.1668.v1

Utilization of Flotation Wastewater for Separation of Chalcopyrite and Molybdenite by Selective Surface Passivation

Guohua Gu, Yuwu Guo, Yisheng Zhang, Qingke Li, Su Liao, Yanhong Wang

Subject: Engineering, Mining And Mineral Processing Keywords: Chalcopyrite; Molybdenite; Flotation wastewater; Surface passivation; Flotation separation

Online: 27 March 2024 (10:33:26 CET)

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Preprint ARTICLE | doi:10.20944/preprints202310.0133.v2

Energy Accumulation Law of Different Forms of Coal-Rock Com-Binations

Zibo Li, Guohua Zhang, Yubo Li, Wenjun Zhou, Tao Qin, Li Zeng, Gang Liu

Subject: Engineering, Mining And Mineral Processing Keywords: Coal thickness change; Combination; Combined rock strata; Energy accumulation; Rock burst

Online: 6 October 2023 (11:45:55 CEST)

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This paper aims to investigate the coal thickness change area of the combined rock strata energy accumulation law. The method of connecting a uniaxial compression experiment with a theoret-ical analysis is used in this work. We employ a combination of coal and rock to carry out our studies. We investigate how different lithologies and ratios of coal-rock height affect the me-chanical properties of the mixture and the law governing energy accumulation. We have deter-mined the following facts: (1) The combination's peak strength and elastic modulus exceed that of coal and are inferior to that of rock but are nearer to that of coal. (2) When the coal-rock height ratios are dissimilar, the peak strength and modulus of elasticity of the combination show a negative correlation with the coal-thickness share, and the pre-peak energy accumulation and impact energy index of the combination shows a positive correlation with the coal-thickness share. (3) For the combination with the same coal-rock height ratio, the peak strength, elastic modulus, pre-peak energy accumulation, and impact energy index all increase with greater rock strength and elastic modulus. The presence of a hard rock layer affects the accumulation of pre-peak energy. ( 4 ) The stress in the surrounding rock gradually decreases as the coal thick-ness increases. In the area where coal thickness declines, the stress in surrounding rock is higher than that in the region where it thickens. The energy stored in the surrounding rock is directly proportional to the coal in the zone. Conversely, areas with thinner coal deposits exhibit a lower energy storage capacity in the surrounding rock than those with thicker coal deposits. The stress distribution of surrounding rock in coal thickness change is abnormal; substantial energy accu-mulation can swiftly initiate dynamic disasters, such as rock bursts. This study has important reference significance for preventing and controlling rock burst in coal thickness change areas.

Preprint ARTICLE | doi:10.20944/preprints202403.0373.v1

New Model and Finite Element Analysis of the Anti-extrusion Strength of Backfill Drilling Pipelines

HAO LI, HONGJIANG WANG, CHUNKANG LIU

Subject: Engineering, Mining And Mineral Processing Keywords: backfill filling; pipeline rupture; anti-extrusion strength; finite element analysis ;

Online: 6 March 2024 (14:26:29 CET)

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Preprint ARTICLE | doi:10.20944/preprints202401.1999.v1

Formulation Optimization and Performance Prediction of Red Mud Particle Adsorbents Based on Neural Networks

Longjiang Li, Zhi Wen Yang, Yalan Wang, WenYuan Wang

Subject: Engineering, Mining And Mineral Processing Keywords: Back-propagation neural networks; hazardous bauxite waste; orthogonal test; wastewater treatment

Online: 29 January 2024 (08:49:13 CET)

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Preprint ARTICLE | doi:10.20944/preprints202404.0164.v1

Determination of Critical Damage Size of Inclined Waterproof Coal Pillar under Asymmetric Load

Xingping Lai, Xiaoqian Yuchi, Helong Gu, Pengfei Shan, Wenhua Yang

Subject: Engineering, Mining And Mineral Processing Keywords: Inclined coal seam; Asymmetric loading; Waterproof coal pillar; Critical size

Online: 2 April 2024 (05:35:59 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202401.2070.v1

Mechanism of Phosphate Desorption from Activated Red Mud Particle Adsorbents

Zhi wen Yang, Longjiang Li, Yueqin Qiu, Yalan Wang

Subject: Engineering, Mining And Mineral Processing Keywords: red mud; granular adsorbent; desorption mechanism; regeneration

Online: 31 January 2024 (01:56:31 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0994.v1

Design of Unmanned Road Width in Open-Pit Mines Based on Offset Reaction Time

Liu Han, Peng Liu

Subject: Engineering, Mining And Mineral Processing Keywords: Unmanned driving; Truck dynamics; Offset reaction time; Road width; Economic benefits

Online: 18 March 2024 (08:09:42 CET)

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Preprint ARTICLE | doi:10.20944/preprints202307.1710.v1

Mechanistic Study and Application of Anionic/Cationic Combination Collector ST-8 for the Flotation of Spodumene

Jun Zhao, Huihua Luo, Yutong Liu, Ju Liu, Liqing Peng, Mei Cen, Fengyuan Li

Subject: Engineering, Mining And Mineral Processing Keywords: spodumene, combined collector, flotation, surface tension measurement, Zeta potential, infrared spectrum analysis

Online: 26 July 2023 (11:27:39 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202312.1408.v1

Fractal Evolution Characteristics of Isolation Layers in Submarine Gold Mine: A Case Study

Yin Chen, Zijun Li, Weixing Lin, Yan He, Guoqiang Wang, Renze Ou, Qi Liu

Subject: Engineering, Mining And Mineral Processing Keywords: undersea mining; isolation layer; discrete element method; fracture fractal dimension

Online: 19 December 2023 (09:01:49 CET)

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Preprint ARTICLE | doi:10.20944/preprints202403.0877.v1

Study on the Macro-Fine Mechanical Behavior of Ores Flow Based on Discrete Element Method

Zhiguo Xia, Zhe Deng, Zengxiang Lu, Chenglong Ma

Subject: Engineering, Mining And Mineral Processing Keywords: ore storage section of orepass; discrete element method; ore-rock flow characteristics; lateral pressure of shaft wall; wall damage degree

Online: 15 March 2024 (14:41:00 CET)

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Preprint ARTICLE | doi:10.20944/preprints202404.1139.v1

Deformation Prediction Model of Existing Tunnel Structures with Equivalent Layered Method‐Peck Coupled under Multiple Factors

Yifan Li, Changfu Huang, Hongjian Lu, Chao Mou

Subject: Engineering, Mining And Mineral Processing Keywords: deformation prediction model; multiple factors; equivalent layered method; peck; underpass tunnel; existing tunnel

Online: 17 April 2024 (12:03:36 CEST)

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