机械力化学浸出法从氧化锌矿中高效浸出锌

Efficient mechanochemical leaching of zinc from zinc oxide ores

以篮式研磨机为机械力化学活化设备对我国兰坪地区低品位氧化铅锌矿进行研究,提出将研磨与NaOH溶液浸出过程相结合浸出锌的机械力化学浸出(MCL)工艺。研究浸出温度、NaOH浓度、浸出时间、液固比和搅拌速度对锌浸出率的影响。实验结果表明,在最佳浸出条件下,采用MCL工艺锌的浸出率达到92.3%,比常规搅拌浸出(CSL)工艺的高7.2%,且两种工艺的能耗相差不大,证明了MCL工艺的优越性。通过对原矿进行锌物相分析以及对最佳条件下不同工艺浸出渣进行XRD、SEM-EDS、EPMA和粒度等分析,研究机械力化学活化的强化机理。

A basket grinder was used as mechanochemical activation equipment to study low-grade lead-zinc oxide ores in the Lanping area,China and a mechanochemical leaching(MCL)process combining grinding with NaOH solution leaching was proposed for zinc leaching.The effects of leaching temperature,NaOH concentration,leaching time,liquid-solid ratio,and stirring speed on zinc leaching rate were investigated.Experimental results show that under the optimal conditions,the zinc leaching rate of MCL reaches 92.3%,which is 7.2%higher than that of conventional stirring leaching(CSL).And small difference in energy consumption is observed between the two processes,indicating the superiority of MCL.The strengthening mechanism of mechanochemical activation was investigated by analyzing the zinc phase of raw ore,and XRD,SEM−EDS,EPMA and particle size analyses were conducted on leaching residues from different processes under the optimal conditions.