无铁渣湿法炼锌提铟工艺

提出了一种锌、铟清洁生产工艺,该方法在保留传统湿法炼锌主体流程的前提下,利用铁闪锌矿精矿的铁资源、部分锌源及锰矿的锰源,直接制备高档次的锰锌软磁铁氧体材料。工艺过程包括:中浸渣高温高酸浸出、还原及除铜、萃取提铟、初步净化、深度净化及开路锌、共沉淀、铁氧体制备等。本方法取消了湿法炼锌流程中的除铁过程,作到铁渣和SO2的零排放,简化了湿法炼锌提铟流程,大幅度提高铟锌回收率;同时解决了"直接共沉淀法"铁源的长期供应问题。

The Hydrometallurgy of Zinc and Indium without Iron Residue

A clear zinc hydrometallurgical process is proposed. By using iron and part of zinc in sphalerite concentrates and manganese in pyrolusite, high quality Mn-Zn soft magnetic ferrites can be directly prepared in the process, going on premise remaining the neutral leaching, purification and electrowinning in the traditional zinc hydrometallurgy flow sheet. This method includes the following processes, such as leaching the neutral leached residue with high concentration sulphuric acid at high temperature, reduction and copper removing, indium extracting, the primary purifying, deeply purifying and zinc separating, coprecipitating and preparing Mn-Zn soft magnetic ferrites, etc. This process cancel the iron removing process in traditional zinc hydrometallurgy flow sheet, so it has the following advantages: no discharging of iron residue and SO_2, simplify the indium recovering process, increasing the indium recovery obviously, and resolving the iron supply problem for long time existed in directly coprecipitating process.