Abstract The separation and recovery of copper and indium from a solution arising from the reductive leaching of a zinc leaching residue was studied. Copper was enriched into a copper precipitate produced by iron powder precipitation; indium was hydrolyzed and enriched into a gypsum indium precipitate produced by limestone adjustment of pH. Separation and recovery of both copper and indium were achieved. The results showed that precipitation of copper(II) and arsenic(III) as Cu2O and Cu3As is thermodynamically feasible by adding iron powder to the reductive leach of a zinc leaching residue. Increasing the iron powder addition and reaction temperature promoted the formation of Cu2O and Cu3As. In the process of neutralizing and precipitating indium by adjusting the pH using limestone, indium was mainly concentrated in the precipitate by hydrolytic precipitation. The pH of the neutralization endpoint plays a decisive role in this hydrolytic enrichment. The extent of indium precipitation exceeded 98%, and the indium content of the precipitate reached 3.6 kg/t. Addition of limestone balances the acid across the entire production process. The main phase in the gypsum indium precipitate was CaSO4·2H2O, the stable properties of which create favorable conditions for the recovery of indium in subsequent steps.

中文翻译：

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从湿法冶金溶液中分离铜和铟

摘要 研究了从锌浸渣还原浸出的溶液中分离回收铜和铟。铜富集成铁粉沉淀产生的铜沉淀；铟被水解并富集成通过石灰石调节 pH 值产生的石膏铟沉淀物。实现了铜和铟的分离和回收。结果表明，通过将铁粉加入锌浸出渣的还原浸出中，铜 (II) 和砷 (III) 以 Cu2O 和 Cu3As 的形式沉淀在热力学上是可行的。增加铁粉添加量和反应温度促进了Cu2O和Cu3As的形成。在用石灰石调节pH值中和沉淀铟的过程中，铟主要通过水解沉淀而富集在沉淀物中。中和终点的 pH 值在这种水解富集中起着决定性的作用。铟析出程度超过98%，析出物中铟含量达到3.6kg/t。添加石灰石可以平衡整个生产过程中的酸。石膏铟沉淀物的主要相为CaSO4·2H2O，其稳定的性质为后续步骤中铟的回收创造了有利条件。