Large quantities of indium-bearing zinc-leached residue (ZLR) are produced constantly in the hydrometallurgical production of zinc, including zinc, indium, iron and other valuable metals. In order to recover valuable metals from the residue, a new reductive leaching process using galena as reductant has been developed, in which the extensive leaching of zinc and indium is achieved. A shrinking core model under the control of surface chemical reaction best fitted the leaching of indium from the residue. The apparent activation energy of indium leaching was calculated to be 64 kJ/mol, and the reaction orders were determined as −0.34 and 1.47 with respect to particle size and initial H₂SO₄ concentration, respectively. The extent of leaching was 87% for zinc, 91% for iron and 88% for indium after 90 min at 85 °C, using an initial H₂SO₄ concentration of 140 g/L and a molar ratio of lead sulfide to zinc ferrite of 1:1. The reductive leaching process of the residue achieved high dissolution of zinc and indium, and iron existed as Fe²⁺ in solution would prove beneficial for the subsequent iron removal stage.

在锌的湿法冶金生产中不断产生大量的含铟锌浸出残渣（ZLR），包括锌，铟，铁和其他贵重金属。为了从残留物中回收有价值的金属，已经开发了一种利用方铅矿作为还原剂的新的还原浸出工艺，其中实现了锌和铟的大量浸出。在表面化学反应控制下的收缩核模型最适合从残留物中浸出铟。铟浸出的表观活化能经计算为64 kJ / mol，相对于粒径和初始H ₂ SO ₄，反应阶数确定为-0.34和1.47集中。使用初始浓度为140 g / L的H ₂ SO ₄和硫化铅与铁酸锌的摩尔比，在85°C下经过90分钟后，锌的浸出率为87％，铁为91％，铟为88％。1：1 残留物的还原浸出过程实现了锌和铟的高度溶解，铁以Fe ^2+的形式存在于溶液中将证明对随后的除铁步骤有利。