Study on the recovery of silver from zinc hydrometallurgy residue

PENG Zhongping; SHEN Qianghua; HE Qian; ZHANG Zhou; LEI Jinqi

doi:10.13264/j.cnki.ysjskx.2020.05.017

Volume 11 Issue 5

Oct. 2020

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Nonferrous Metals Science and Engineering > 2020 > 11(5): 118-126. > DOI: 10.13264/j.cnki.ysjskx.2020.05.017

PENG Zhongping, SHEN Qianghua, HE Qian, ZHANG Zhou, LEI Jinqi. Study on the recovery of silver from zinc hydrometallurgy residue[J]. Nonferrous Metals Science and Engineering, 2020, 11(5): 118-126. DOI: 10.13264/j.cnki.ysjskx.2020.05.017

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Study on the recovery of silver from zinc hydrometallurgy residue

Faculty of Metallurgy and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China

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Received Date: August 17, 2020
Published Date: October 30, 2020

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In the process of zinc hydrometallurgy, the silver in zinc concentrate is mainly concentrated in acid leaching residue. The grade of Ag in the leaching residue of this mineral sample is about 234 g/t, containing Zn, Pb and other reusable metals. Therefore, it is of great significance to study the recovery and reuse of Ag, Zn, Pb, etc. This paper studied the enrichment trend of Ag, Zn and Pb in the physical separation process and the influence of the amount of sodium chloride, roasting time and temperature on Ag leaching rate, through physical separation, reduction roasting, direct smelting and oxidation roasting and cyanidation of Ag from acid leaching residue. The results showed that Zn and Ag could be enriched by flotation after high temperature and high acid leaching. The Ag and Pb in crude lead were enriched and Ag grade was increased by 6 times after acid leaching. The optimum parameters of oxidation roasting and cyanide leaching for silver extraction were obtained by the experiments.
- acid leaching residue,
- physical separation,
- oxidizing roasting,
- cyanidation,
- silver

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