Working Paper Article Version 1 This version is not peer-reviewed

Pyrometallurgical Removal of Arsenic from Dusts Collected in Electrostatic Precipitators of Copper Part II:-Dust from a Fluidized Bed Roasting Furnace

Version 1 : Received: 15 August 2020 / Approved: 20 August 2020 / Online: 20 August 2020 (09:55:21 CEST)

How to cite: Henao, H.; Paredes, I.; Diaz, R.; Ortiz, J. Pyrometallurgical Removal of Arsenic from Dusts Collected in Electrostatic Precipitators of Copper Part II:-Dust from a Fluidized Bed Roasting Furnace. Preprints 2020, 2020080454 Henao, H.; Paredes, I.; Diaz, R.; Ortiz, J. Pyrometallurgical Removal of Arsenic from Dusts Collected in Electrostatic Precipitators of Copper Part II:-Dust from a Fluidized Bed Roasting Furnace. Preprints 2020, 2020080454

Abstract

This paper, the second in a series of two, describes the experimental results for removing arsenic from the dust collected in the electrostatic precipitators of a fluidized bed roasting oven (RP dust). The RP dust produced is discharged as a toxic waste, although its copper content is close to 20% by weight. This work aims to process the RP dust; until obtained a material with a low concentration of arsenic, which could be recirculated in smelting operations and recover the valuable metals. Based on the successful experience obtained in the first document with FS dust, this work proposes to use the reduction-sulphidation-volatilization processes to carry out the volatilization of arsenic from RP dust. A set of experiments was realized in the roasting different ratios of the mixture of copper concentrate / RP dust, sulfur / RP dust varying temperature and roasting time; to reach an arsenic concentration <0.5% by weight. The RP dust was characterized using different techniques, that confirmed more than 20% by weight of copper and describing its structure as a small particle agglomerate (<5 µm), with a complex sulfoxide morphology. The main results indicated: that for a 75/25 mixture of the copper concentrate / PR dust under 700 ° C, 15 minutes roasting time with air atmosphere, the arsenic volatilization was 96% by weight. Meanwhile, for a 5/95 mixture of sulfur / RP dust, at 650 ° C, the volatilization of arsenic was 67% by weight.

Subject Areas

Copper smelter dust; electrostatic precipitators of copper; removal of arsenic; sulphidisation; roasting process.

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