高铅Zn焙砂两段浸出工艺提锌试验研究

Experimental study on zinc extraction by two-stage leaching process of high lead Zn calcine

以Pb含量为7.91%的高铅Zn焙砂为原料,采用中性浸出—酸性浸出两段酸浸工艺浸出该焙砂,使焙砂中的Zn进入到溶液,而Pb在渣中富集。探究了中性浸出、酸性浸出过程中温度、硫酸浓度、液固比、时间等工艺因素对锌浸出率和铅富集效率的影响。结果表明,在中性浸出过程中,Zn浸出率为90.73%,Pb在中浸渣中的富集含量为29.68%;中浸渣经酸浸处理,Zn浸出率可以达到98.60%,Pb在酸浸渣中的富集含量为36.54%。

High-lead Zn calcine with Pb content of 7.91%is used as raw material.The calcine is leached by two-stage leaching process of neutral leaching and acid leaching.Zn in the calcine enters the solution while Pb is enriched in residue.This paper explored the influence of process factors such as temperature,acid concentration,liquid-to-solid ratio and time in the neutral leaching and acid leaching processes on the leaching rate of zinc and the enrichment efficiency of lead.The results show that the leaching rate of Zn is 90.73%,and the enrichment content of Pb in the intermediate leaching residue is 29.68%at the neutral leaching stage.After the acid leaching treatment of the intermediate leaching residue,the leaching rate of Zn can reach 98.60%,the enrichment content of lead in the acid leaching residue is 36.54%.