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Recovering Silver from Acid-Leaching Residues of Zinc Ore by Flotation
Author(s): 
Pages: 19-25
Year: Issue:  3
Journal: Precious Metals

Keyword:  non-ferrous metallurgyzinc leaching residuesoccurrenceflotationcondition optimization;
Abstract: In the traditional recycling of silver zinc smelting slag, most silver is recovered from rotary kiln slag. However, silver can not effectively be recovered, due to changes of the mineral properties. A process involving the recovery of silver directly from zinc-leached residues was developed. The residues after acid leaching of zinc contained Ag 350 g/t, Au<0.01 g/t, Pb 3.87%, Zn 17.45%, Cu 1.38%, and 60.13% of silver existing in the residues was natural silver state. By using HT-1# as a collector and HT-2# as a frother, and following a flowsheet of one roughing stage, four cleaning stages and three scavenging stages, the silver in the residues could be concentrated by about 20 times to a level of 6616 g/t with a recovery rate of 82.98%.
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