低品位氧化锌矿在MACA体系中的循环浸出

Cycle leaching of low grade zinc oxide ores in MACA system

研究Me(Ⅱ)-NH4Cl-NH3-H2O(MACA)体系处理兰坪低品位氧化锌矿的浸出过程,提出用循环浸出方法富集浸出液中锌浓度的工艺技术方案。结果表明:循环浸出的优化条件为液固比4:1、常温、搅拌速度300 r/min、浸出时间3 h;通过循环次数分别为14、15及10的3个阶段的循环浸出试验,获得渣计锌浸出率≥69%、浸出液锌浓度≥33 g/L的较好结果。该工艺具有流程简短、能耗低、净化容易、环境友好等优点,对低品位高碱性脉石难选氧化锌矿的开发利用具有重要意义。

The leaching processes of the low grade zinc oxide ores from Lanping in the system of Me（Ⅱ）-NH4Cl-NH3-H2O（MACA） were studied.The technical process of enriching the concentration of zinc in lixivium by cycle leaching was proposed.The results show that the optimal conditions are found,including the ratio of liquid to solid to be 4,stirring speed to be 300 r/min,leaching time to be 3 h and at ambient temperature.Three-stage experiments of cycle leaching were carried out,and the results indicated that the zinc-leaching rate is more than 69% and the zinc concentration of leaching solution is more than 33 g/L.This process has lots of advantages,including a simple flow sheet,low energy consumption,easy purification,being environment-friendly and so on.Therefore,it is to be significant in exploitation and utilization of low-grade zinc oxide ores,which contain high-alkaline gangues and are also difficultly treated by beneficiation.