Ammoniacal leaching and recovery of copper from alloyed low-grade e-waste

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• 作者：Ewa Rudnik ; Maciej Pierzynka ; Piotr Handzlik
• 关键词：Copper ; Ammoniacal leaching ; Electrolysis ; Recovery ; E ; waste
• 刊名：Journal of Material Cycles and Waste Management
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：18
• 期：2
• 页码：318-328
• 全文大小：3,157 KB
• 刊物类别：Earth and Environmental Science
• 刊物主题：Environment
  Waste Management and Waste Technology
  Environmental Management
  Industrial Pollution Prevention
  
• 出版者：Springer Japan
• ISSN：1611-8227

文摘

The paper concerns a hydrometallurgical method for selective recovery of copper from low-grade electric and electronic wastes. The following consecutive stages were proposed: smelting of the scraps to produce Cu–Zn–Ag alloy, leaching of the alloy in ammoniacal solution, and selective copper electrowinning. Cu–Zn–Ag alloy was a polymetallic and five-phase system. It was leached in chloride, carbonate, sulfate and thiosulfate solutions. This resulted in the separation of the metals, wherein metallic tin and silver as well as lead salts remained in the slimes, while copper and zinc were transferred to the electrolyte. Copper was selectively recovered from the ammoniacal solutions by the electrolysis, leaving zinc ions in the electrolyte. The best conditions of the alloy treatment were obtained in the ammonia–carbonate system, where the final product was copper of high purity (99.9 %) at the current efficiency of 60 %. Thiosulfate solution was not applicable for the leaching of the copper alloy due to secondary reactions of the formation of copper(I) thiosulfate complexes and precipitation of copper(I) sulfide, both inhibiting dissolution of the metallic material.