Silver sulfide leaching with a copper-thiosulfate solution in the absence of ammonia

作     者：CUI Yiqi TONG Xiong Alejandro Lopez-Valdivieso 

作者机构：Faculty of land and Resource Engineering Kunming University of Science and Technology Kunming 650093 China Instituto de Metalurgia UniversidadAutonoma de San Luis Potosi San Luis Potosi C.P. 78210 Mexico 

出 版 物：《Rare Metals》 (稀有金属（英文版）)

年 卷 期：2011年第30卷第2期

页      面：105-109页

核心收录：

学科分类：081702[工学-化学工艺] 081704[工学-应用化学] 07[理学] 0806[工学-冶金工程] 08[工学] 0817[工学-化学工程与技术] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 070301[理学-无机化学] 0702[理学-物理学] 

基　　金：supported by the Joint Foundation of the National Natural Science Foundation Committee and Yunnan Provincial Government of China (No. U0937602) 

主　　题：extraction silver leaching copper sulfate thiosulfate 

摘      要：Leaching from silver *** a copper-thiosulfate solution in the absence of ammonia was investigated. It is found that silver sulfide could be effectively dissolved in the copper-thiosulfate system without ammonia. The effects of thiosulfate concentration, cop- per-to-thiosulfate ratio, agitation vigorousness, pH values, and dissolved gases on the leaching of silver sulfide with the copper-thiosulfate solution were studied. A maximum extraction of 95.1% was achieved with the 0.12 mol/L thiosulfate and the 0.048 rnol/L copper sulfate. It is shown that copper-to-thiosulfate ratio is an important factor in silver sulfide dissolution and oxygen is not needed to leach silver sulfide, which leads to the instability of the leaching system at high copper-to-thiosulfate ratio. On the other hand, the silver extraction is not affected by the pulp pH values.