Cleaner recovery of multiple valuable metals from cyanide tailings via chlorination roasting

Recovery of valuable metals is hindered by sulfur in cyanide tailings. In this work, a process for the clean recovery of multiple valuable metals through chlorination roasting was proposed. HSC software was used to find that the process of dissociation of chlorides is further accelerated by sulfur i...

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Bibliographic Details
Published inSeparation science and technology Vol. 56; no. 12; pp. 2113 - 2123
Main Authors Long, Hailin, Li, Haoyu, Pei, Jiannan, Srinivasakannan, C., Yin, Shaohua, Zhang, Libo, Ma, Aiyuan, Li, Shiwei
Format Journal Article
LanguageEnglish
Published Abingdon Taylor & Francis 13.08.2021
Taylor & Francis Ltd
Subjects
Calcium chloride
Chlorides
Chlorination
Copper
Cyanide process
Cyanide tailings
Cyanides
Dissociation
Dosage
Food processing
Gold
Materials recovery
Metals
Mine tailings
Recovery
Roasting
Silver
simultaneous recycling
Sulfur
Sulphur
Tailings
Temperature
thermodynamics research
valuable metals
Zinc
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Summary:Recovery of valuable metals is hindered by sulfur in cyanide tailings. In this work, a process for the clean recovery of multiple valuable metals through chlorination roasting was proposed. HSC software was used to find that the process of dissociation of chlorides is further accelerated by sulfur in the tailings. Experiments were carried out to study temperature variables and chlorinated agent variables. The optimum conditions were identified to be a CaCl 2 dosage of 4%, roasting temperature of 1323 K, achieved maximum recovery of 84% of Au, 71% of Ag, 72% of Cu, 92% of Pb, and 69% of Zn.
ISSN:0149-6395
1520-5754
DOI:10.1080/01496395.2020.1812650