氨法处理氧化锌矿制取电锌

Treating zinc oxide ores using ammonia-ammoniumchloride to produce electrolysis zinc

研究了用氯化铵法直接从氧化锌矿提取电锌的新工艺.该工艺采用氯化铵 氨水溶液作浸出剂,氧化锌矿中的锌以锌氨配合物形式进入浸出液,在浸出锌的同时将杂质砷、锑、铁等除去.研究结果表明:氨溶锌浸出率≥93%;浸液中的As和Sb的质量浓度都低于0.25mg/L,Fe的质量浓度低于0.15mg/L,其他杂质质量浓度低;浸出液经锌粉1次净化除杂后进行电积制取电锌.电锌中Zn的质量分数达99.999%,杂质含量极低,其中Fe的质量分数仅为0.00005%;电流效率高达96.35%,直流电耗为2502kW·h;电解废液经补氨后返回浸取.

A new process of producing zinc from zinc oxide ores in the system of NH_4Cl-NH_3-H_2O was introduced . In the process, NH_4Cl-NH_3-H_2O was used as leaching agent, the Zn(NH_3)^(2+)_i was formed when the solution was reacted with zinc oxide ores, the rate of zinc that could be dissolved in the solution was more than 93%, while the content of both As and Sb were lower than 0.25 mg/L, the content of Fe was lower than 0.15 mg/L, and there were little other impurities in the solution. The leached solution was purified with zinc powder, and then electrolyzed to produce electrolysis zinc. The production had good quality, w(Zn)>99.999%, and the content of the impurities were very low, extraordinarily w(Fe)<1.0×10^(-6); the current efficiency was 96.35% while the energy requirement was 2 505 kW·h. Ammonia is added into the solution, which would be recycled as leaching solution again.