难处理铅锌矿酸浸渣回收硫酸铅的工艺研究

采用氯化钠-硫酸混合溶液对铅锌矿难处理酸浸渣进行浸出,对浸出液稀释,制备硫酸铅,考察了氯化钠浓度、液固比、时间、温度和硫酸浓度等因素对酸浸渣的浸出影响和考察稀释倍数、时间等因素对沉淀硫酸铅的影响。结果表明,在氯化钠浓度为330 g/L,液固比为7∶1,时间为1.5 h,温度95℃,硫酸浓度为1 mol/L的条件下,铅的浸出率为82.1%;在浸出液稀释倍数为2.5,静置时间7 h的条件下,硫酸铅的沉淀率为93%,产品纯度为99.1%。铅的回收率为76%,比传统方法提高30%以上。

Study on recovery lead sulfate from complex acid leaching residue of lead-zinc mine

The extraction process using sodium chloride and sulfuric acid mixed solution,leaching lead from complex acid leaching residue of lead-zinc mine and preparing the lead sulfate by dilute leaching solution.The influences of sodium chloride concentration,the liquid-solid ratio,time,temperature,acid concentration on lead leaching rate and diluted times,time on the lead sulfate precipitation was discussed.The results showed that the lead leaching rate of 82.1%.when sodium chloride concentration of 330 g/L,sulfuric acid concentration of 1 mol/L,the liquid-solid ratio of 7∶ 1 at 95 ℃ for 1.5 h,the purity of 99.1% products.The leaching solution in diluted times of 2.5 for standing time 7 h,lead sulfate precipitation rate was 93%.The lead recovery rate was 76%,it was improved by more than 30% compared with the traditional method.