分银渣脱铅工艺研究

Study on Technology of Lead Leaching from Silver Separating Residue

以分银渣为原料,对比研究了高氯盐脱铅、碱浸脱铅、钠盐转化酸浸脱铅工艺,探寻了最佳的分银渣脱铅工艺。采用高氯盐脱铅工艺,分银渣中铅的浸出率达98.4%,但溶液中氯化钠容易结晶析出。采用碱浸脱铅工艺和钠盐转化酸浸脱铅工艺,分银渣中铅的浸出率分别为87.9%和87.0%,两者浸出率相当,但碱浸脱铅工艺需高浓度碱液,成本较高且生产操作困难,钠盐转化酸浸脱铅工艺具有流程简单、选择性好及成本较低等优点。

Using silver slag as raw material, the technology of removing lead from silver residue was studied by comparing with high chlorine salt, alkali leaching and sodium salt conversion acid leaching, the best lead leaching method was explored. The leaching rate of lead was 98.4 % by using salt leaching method, but sodium chloride in solution was easily crystallized. With alkaline leaching method and sodium carbonate transformation and acid leaching method, the leaching rates of lead were 87.9 % and 87.0 %, but the alkaline leaching method requires high concentration of alkali liquor, which with high cost and difficult to operate. The sodium carbonate transformation and acid leaching method has the advantages of simple process, good selectivity and low cost.