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Removal of As in Copper Smelter Dust's Chlorinated Leaching Solution by SO2 Reduction and the Subsequent Separation of Bi/Cu/Zn
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Removal of As in Copper Smelter Dust's Chlorinated Leaching Solution by SO2 Reduction and the Subsequent Separation of Bi/Cu/Zn
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Journal Article
Removal of As in Copper Smelter Dust's Chlorinated Leaching Solution by SO2 Reduction and the Subsequent Separation of Bi/Cu/Zn
2025
Overview
This paper presents a treatment process for copper smelter dust's chlorinated leaching solution. Addressing the challenge of separating As and valuable metals from this solution, the process utilized S02 to reduce As(V) to As(III) and NaOH to neutralize Bi(III), resulting in the stepwise formation of AS2O3 and BiOCl. The results indicate that, under optimal conditions, the precipitation ratio of As reached 71.23%, and the Bi precipitation ratio reached 98.38%. Following Bi precipitation, two separation strategies were attempted for the recovery of Cu and Zn. The first strategy involves recovery of Cu using a sulfide precipitation method, followed by the recrystallization of ZnS04. Under optimal conditions, the Cu precipitation ratio can reach 99.81%. The second strategy involves Cu solvent extraction using Lix984N coupled with Zn solvent extraction using P204. Under appropriate conditions, the Cu extraction rate can achieve 98.59%. A comprehensive assessment indicates that using sulfidation - crystallization to separate Cu and Zn is more economical than employing solvent extraction methods. Consequently, the final process is determined as follows: As removal by SO2 reduction > Bi recovery by NaOH neutralization > Cu recovery by sulfidation precipitation > Zn recovery by crystallization.
Publisher
Springer Nature B.V
Subject
