Deep cleaning of a metallurgical zinc leaching residue and recovery of valuable metals

Peng Xing; Bao-zhong Ma; Peng Zeng; Cheng-yan Wang; Ling Wang; Yong-lu Zhang; Yong-qiang Chen; Shuo Wang; Qiu-yin Wang

doi:10.1007/s12613-017-1514-2

Volume 24 Issue 11

Nov. 2017

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2017 > 24(11): 1217-1227

Peng Xing, Bao-zhong Ma, Peng Zeng, Cheng-yan Wang, Ling Wang, Yong-lu Zhang, Yong-qiang Chen, Shuo Wang, and Qiu-yin Wang, Deep cleaning of a metallurgical zinc leaching residue and recovery of valuable metals, Int. J. Miner. Metall. Mater., 24(2017), No. 11, pp. 1217-1227. https://doi.org/10.1007/s12613-017-1514-2

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Peng Xing, Bao-zhong Ma, Peng Zeng, Cheng-yan Wang, Ling Wang, Yong-lu Zhang, Yong-qiang Chen, Shuo Wang, and Qiu-yin Wang, Deep cleaning of a metallurgical zinc leaching residue and recovery of valuable metals, Int. J. Miner. Metall. Mater., 24(2017), No. 11, pp. 1217-1227. https://doi.org/10.1007/s12613-017-1514-2

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Research Article

Deep cleaning of a metallurgical zinc leaching residue and recovery of valuable metals

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Corresponding author:
Cheng-yan Wang E-mail: chywang@yeah.net
Received: 5 February 2017; Revised: 19 June 2017; Accepted: 29 June 2017

Abstract

Abstract

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 (mL/g), a leaching time of 2 h, and a temperature of 90℃. 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℃. 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.
- deep cleaning;
- zinc leaching residue;
- zinc;
- lead;
- leaching;
- electrowinning

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