Deep cleaning of a metallurgical zinc leaching residue and recovery of valuable metals
来源期刊：International Journal of Minerals Metallurgy and Materials2017年第11期
论文作者：Peng Xing Bao-zhong Ma Peng Zeng Cheng-yan Wang Ling Wang Yong-lu Zhang Yong-qiang Chen Shuo Wang Qiu-yin Wang
文章页码：1217 - 1227
摘 要：Huge quantities of zinc leaching residues（ZLRs） generated from zinc production are dumped continuously around the world and pose a potential environmental threat because of their considerable amounts of entrained heavy metals（mainly lead）. Most ZLRs have not been properly treated and the valuable metals in them have not yet been effectively recovered. Herein, the deep cleaning of a ZLR and recovery of valuable metals via a hydrometallurgical route were investigated. The cleaning process consists of two essential stages: acid leaching followed by calcium chloride leaching. The optimum conditions for extracting zinc, copper, and indium by acid leaching were a sulfuric acid concentration of 200 g·L-1, a liquid/solid ratio of 4:1（m L/g）, a leaching time of 2 h, and a temperature of 90°C. For lead and silver extractions, the optimum conditions were a calcium chloride concentration of 400 g·L-1, a pH value of 1.0, a leaching time of 1 h, and a temperature of 30°C. After calcium chloride leaching, silver and lead were extracted out and the lead was finally recovered as electrolytic lead by electrowinning. The anglesite phase, which poses the greatest potential environmental hazard, was removed from the ZLR after deep cleaning, thus reducing the cost of environmental management of ZLRs. The treatment of chlorine and spent electrolyte generated in the process was discussed.
Peng Xing1，Bao-zhong Ma1，Peng Zeng1,2，Cheng-yan Wang1，Ling Wang1，Yong-lu Zhang1，Yong-qiang Chen1，Shuo Wang3，Qiu-yin Wang2
1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing2. Yunnan Yuntong Zinc Co.Ltd.3. Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology
摘 要：Huge quantities of zinc leaching residues（ZLRs） generated from zinc production are dumped continuously around the world and pose a potential environmental threat because of their considerable amounts of entrained heavy metals（mainly lead）. Most ZLRs have not been properly treated and the valuable metals in them have not yet been effectively recovered. Herein, the deep cleaning of a ZLR and recovery of valuable metals via a hydrometallurgical route were investigated. The cleaning process consists of two essential stages: acid leaching followed by calcium chloride leaching. The optimum conditions for extracting zinc, copper, and indium by acid leaching were a sulfuric acid concentration of 200 g·L-1, a liquid/solid ratio of 4:1（m L/g）, a leaching time of 2 h, and a temperature of 90°C. For lead and silver extractions, the optimum conditions were a calcium chloride concentration of 400 g·L-1, a pH value of 1.0, a leaching time of 1 h, and a temperature of 30°C. After calcium chloride leaching, silver and lead were extracted out and the lead was finally recovered as electrolytic lead by electrowinning. The anglesite phase, which poses the greatest potential environmental hazard, was removed from the ZLR after deep cleaning, thus reducing the cost of environmental management of ZLRs. The treatment of chlorine and spent electrolyte generated in the process was discussed.
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