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湿法炼锌过程中产出的铅银渣经硫化浮选得到的银精矿 ,通过氧化焙烧产出含银达± 1 .0 %的富银焙砂。研究了采用盐酸氧化酸浸预处理该富银焙砂以分离锌、铜等 ,同时使银转化为氯化银 ,再用亚硫酸钠碱性络合浸出转化渣回收银的工艺。考查了盐酸氧化酸浸过程中银的分散情况 ,结果表明 ,该过程中银的浸出率平均为 2 .7% ;采用了单因素条件试验研究方法 ,在试验的最佳条件下 ,富银焙砂经盐酸氧化酸浸后亚硫酸钠络合浸银 ,银的浸出率达 90 %以上 ,浸银液未经净化 ,直接用水合肼还原可得含量为 96 %以上的银粉。
The lead silver slag produced in the wet-process zinc smelting process is benefited from the silver concentrate obtained by sulfide flotation, and the silver-rich calcine containing up to ± 1.0% of silver is produced by oxidation roasting. The process of pretreating the silver-rich calcine to separate zinc, copper and the like by using hydrochloric acid acid leaching while converting the silver into the silver chloride and then recovering the silver by alkali complexation with sodium sulfite was studied. The results showed that the average leaching rate of silver in the process was 2.7%. Under the optimum conditions of the experiment, the silver-rich calcine After acid leaching with hydrochloric acid, the leaching rate of silver is above 90%. The silver immersion liquid is not purified, and the silver powder can be directly reduced to 96% with hydrazine hydrate.