湿法炼锌渣中银的回收

在湿法炼锌工艺中锌精矿中的银主要富集在酸性浸出渣中，此矿样的浸出渣中Ag的品位约为234 g/t，还含有Zn、Pb等可重复利用金属，研究Ag、Zn、Pb等的回收再利用具有十分重要的意义。本文以酸性浸出渣为原料进行了物理分选、还原焙烧、直接熔炼法以及氧化焙烧-氰化提银的试验，重点研究了物理分选过程Ag、Zn、Pb的富集走向及氧化焙烧-氰化提银工艺中氯化钠用量、焙烧时间及温度对Ag浸出率的影响。研究得出:高温高酸浸出后浮选可使Zn和Ag得到富集；浸出渣酸浸后熔炼使粗铅中的Ag和Pb富集，Ag品位可提高6倍；并通过试验得到了较优的氧化焙烧和氰化浸出提银工艺参数。 

Study on the recovery of silver from zinc hydrometallurgy residue

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.