湿法炼锌浸出渣湿法和火法联合处理工艺

为了综合回收锌浸渣中的有价金属，进行了弱酸渣酸浸减量化研究，减量后的渣进回转窑处理，酸浸混合液采用锌精矿还原处理－铁粉置换沉铜－锌焙砂预中和－氧化锌粉中和沉铟工艺来分离回收有价金属。采用酸浸工艺和回转窑工艺联合处理锌浸渣，可减少入窑渣量，降低能耗。结果表明，锌浸渣经酸浸可减量50%以上，锌粉中和沉铟工艺可实现锌回收率大于90%，铜回收率大于99%，沉铟后液铟小于5 mg/L。减量后的渣可富集铅、银等金属，该渣送回转窑挥发处理，产出的氧化锌烟尘可用于中和沉铟，中和过程既可使氧化锌中的锌预先浸出，又可进一步富集铟。该工艺可实现锌浸渣的无害化处理和资源综合利用。

Combined Treatment Process of Hydrometallurgy and Pyrometallurgy for Zinc Leaching Residue

In order to comprehensively recover valuable metals from zinc leaching residue, quantitative research on acid leaching reduction of weak acid residue was carried out. The reduced residue was treated in rotary kiln. The acid leaching mixture was separated and recovered by zinc concentrate reduction treatment iron powder replacement copper precipitation zinc calcine pre neutralization zinc oxide powder neutralization indium precipitation process. Adopting acid leaching process and rotary kiln process to treat zinc leaching residue can reduce the amount of residue and energy consumption. The results show that the zinc leaching residue can be reduced by more than 50% after acid leaching, the recovery of zinc is more than 90%, the recovery of copper is more than 99%, and the liquid indium is less than 5mg / L after indium precipitation. The reduced slag can enrich lead, silver and other metals. The slag is sent to rotary kiln for volatilization treatment. The zinc oxide dust can be used for neutralization and indium precipitation. The neutralization process can not only pre leach zinc from zinc oxide, but also further enrich indium. The process realizes the harmless treatment of zinc leaching residue and comprehensive utilization of resources