从冶锌酸浸渣中回收铅、锌的工艺研究  

Study on Recovery of Pb and Zn from Zinc Acid-leaching Residue

作　　者：徐辉[1] 颜文斌[1] 张传宝[1] 高峰[1] 易静[1] 华骏[1] 

机构地区：[1]吉首大学化学化工学院,湖南吉首416000

出　　处：《矿冶工程》2012年第6期78-81,85,共5页Mining and Metallurgical Engineering

基　　金：湖南省科技计划项目(2008GK3003);湖南省教育厅资助科研项目(08C717);吉首大学研究生创新目(JGY201213)

摘　　要：采用高酸氯盐浸出-分离-纯化工艺回收保靖某厂冶锌酸浸渣中的铅、锌并制备PbCl2、ZnO,条件试验研究得出最佳条件如下:第一段浸出中氯化钙用量为渣量的1/5、液固比6∶1、盐酸浓度2 mol/L、反应温度90℃、反应时间1 h,并在此条件下,上清液返回原渣中回浸一次后,补加1/10渣量的氯化钙和1/60溶液体积的浓盐酸作为浸出液循环使用;第二段采用氯化钠溶液纯化PbCl2;第三段采用分段中和法分离铁锌,并加入碳酸钠处理废水。原料扩大10倍验证工艺流程试验,所得产品氯化铅和氧化锌的纯度分别为99.5%和87.6%,其中氯化铅产品纯度达到了试剂化学纯的要求,铅和锌的总收率分别为63.7%和72.5%。The process of highly-acidic chloride leaching-separation-purification was used to recover Pb and Zn from zinc acid-leaching residue in a Baojing smelter for preparing PbCl2 and ZnO.The optimum operating parameters obtained by condition tests were as follows： at the first stage,with CaCl2-slag ratio of 1/5,liquid-solid ratio of 6,hydrochloric acid concentration of 2 mol/L,reaction temperature of 90 ℃ and reaction time of 1 h,CaCl2 of 1/10 slag amount and strong hydrochloric acid of 1/60 solution volume were added as leaching solution for recycling after the supernatant fluid was returned to the original leaching residue;at the second stage,PbCl2 was purified by NaCl solution;at the third stage,iron and zinc was separated by subsection neutralization and the wastewater was treated by adding sodium carbonate.A large-scale test was conducted with the amount of raw materials increased by 10 times to verify the technological process,resulting in PbCl2 and ZnO with purities of 99.5% and 87.6%,respectively,and the recovery rate of lead and zinc being 63.7% and 72.5%,respectively.The purity of PbCl2 came up to the chemical reagent standard.

关 键 词：冶锌酸浸渣 氯化铅 氧化锌 制备 提纯 

分 类 号：X751[环境科学与工程—环境工程] TQ09[化学工程]