An innovative technology for recovery of zinc, lead and silver from zinc leaching residue
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State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology, Kunming 650093, China
Faculty of Land Resource Engineering, Kunming University of Science and Technology, Kunming 650093, China
School of Minerals Processing and Bioengineering, Central South University, Changsha, Hunan 410083, P. R. China
Publication date: 2016-06-01
Corresponding author
Wei Liu   

Central South University, School of Minerals Processing and Bioengineering, 410000 Chang Sha, China
Physicochem. Probl. Miner. Process. 2016;52(2):943-954
Zinc leaching residue is a good source of zinc and has a great potential to be utilized. However, it is very difficult to recover lead, zinc and silver from the residue by traditional technologies. In this study, a new technology based on conversions of PbSO4 and ZnSO4 in the residue to their respective sulfides by reduction roasting with coal powder followed by a flotation treatment was developed. The effects of roasting temperature, coal dosage, reaction time and pyrite dosage were investigated at a laboratory scale. The results showed that the conversion extent of PbSO4 and ZnSO4 under the optimal experimental conditions was 71.89 and 69.76%, respectively. A flotation concentrate containing 39.13% Zn, 6.93% Pb and 973.54 g/Mg Ag was obtained from the treated material, and the recovery of Zn, Pb and Ag was 48.38, 68.23 and 77.41%, respectively. The tailing containing ZnFe2O4 or Fe3O4 could be either stockpiled or further disposed.
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