PreprintArticleVersion 1Preserved in Portico This version is not peer-reviewed
A Step Towards CO2 Sequestration through Mineral Carbonation: Using Ammonium Based Lixiviants for the Dissolution of Calcium from Iron Making Blast Furnace Slag
Version 1
: Received: 16 May 2024 / Approved: 16 May 2024 / Online: 16 May 2024 (17:22:23 CEST)
How to cite:
Kohitlhetse, I. C.; Manono, M. S.; Motsetse, C. K.; Mendonidis, P. M. A Step Towards CO2 Sequestration through Mineral Carbonation: Using Ammonium Based Lixiviants for the Dissolution of Calcium from Iron Making Blast Furnace Slag. Preprints2024, 2024051114. https://doi.org/10.20944/preprints202405.1114.v1
Kohitlhetse, I. C.; Manono, M. S.; Motsetse, C. K.; Mendonidis, P. M. A Step Towards CO2 Sequestration through Mineral Carbonation: Using Ammonium Based Lixiviants for the Dissolution of Calcium from Iron Making Blast Furnace Slag. Preprints 2024, 2024051114. https://doi.org/10.20944/preprints202405.1114.v1
Kohitlhetse, I. C.; Manono, M. S.; Motsetse, C. K.; Mendonidis, P. M. A Step Towards CO2 Sequestration through Mineral Carbonation: Using Ammonium Based Lixiviants for the Dissolution of Calcium from Iron Making Blast Furnace Slag. Preprints2024, 2024051114. https://doi.org/10.20944/preprints202405.1114.v1
APA Style
Kohitlhetse, I. C., Manono, M. S., Motsetse, C. K., & Mendonidis, P. M. (2024). A Step Towards CO<sub>2</sub> Sequestration through Mineral Carbonation: Using Ammonium Based Lixiviants for the Dissolution of Calcium from Iron Making Blast Furnace Slag. Preprints. https://doi.org/10.20944/preprints202405.1114.v1
Chicago/Turabian Style
Kohitlhetse, I. C., Catherine K. Motsetse and Peter M. Mendonidis. 2024 "A Step Towards CO<sub>2</sub> Sequestration through Mineral Carbonation: Using Ammonium Based Lixiviants for the Dissolution of Calcium from Iron Making Blast Furnace Slag" Preprints. https://doi.org/10.20944/preprints202405.1114.v1
Abstract
In recent years, technical processes for the sequestration of CO2 through industrial waste mineral carbonation have been explored and developed. There is a large portfolio of Carbon Capture, Uti-lisation and Storage (CCUS) techniques that have been employed on a laboratory and at pilot scale. These include geological storage, ocean storage and mineralisation by carbonate ores. In view of this, the main purpose of this research was to investigate and explore chemical variables, particularly ammonium salts as lixiviants for calcium mineral extraction from iron making slag. The slag in use was acquired from a Steel Mill in the Vaal Triangle Region in Gauteng, South Af-rica. The experimental test work was conducted using different ammonium lixiviants, namely, NH4NO3, NH4Cl and CH3COONH4 to understand the influence of anion type as well as possible differences in mechanisms of interactions. Lixiviant concentration as well as the reaction time were varied in this research study. The three selected ammonium based lixiviants showed different extents of calcium extraction owing to differences in the anion groups. NH4NO3, NH4Cl and CH3COONH4 were found capable of dissolving 50% to 80% of calcium from the selected slag for different molar concentrations. Anion type and leaching time also had significant influences on the leaching of calcium from the slag. Rapid pH degradation resulted in better calcium extraction ca-pabilities. This work has shown that the selected ammonium salts have a potential as lixiviants for calcium dissolution from iron making blast furnace slags. These lixiviants would therefore be important to consider during calcium mineral carbonation for CO2 sequestration.
Keywords
Ammonium Lixiviants; Calcium Mineral; CO2 Sequestration; Ironmaking Slag
Subject
Engineering, Metallurgy and Metallurgical Engineering
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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