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中文摘要: 以湿法炼锌渣高温挥发所得含铟氧化锌烟尘为原料，在对其进行物性分析基础上，提出在中性体系环境下微波辅助浸出氧化锌烟尘中锌的同时富集铟于渣中。考察了微波功率、硫酸浓度、浸出温度、浸出时间、液固比对烟尘中锌浸出率和铟富集率的影响。结果表明，在初始硫酸浓度65 g/L、浸出时间10 min、浸出温度65 ℃、液固比4 mL/g、微波功率600 W的条件下，锌的浸出率为80.31%，铟的富集率为42.23%，终点pH维持在5.1，铁几乎不被溶出。本方法实现了氧化锌烟尘中锌与铟的有效分离，并成功富集了铟，为后续铟的高效回收提供有利保障。
Abstract:Indium-bearing zinc oxide flue dust generated by reductive volatilization of zinc leaching residue in rotary kiln was used as raw material. Microwave assisted neutral leaching method was recommended to enrich indium and zinc was recovered as much as possible from indium-bearing zinc oxide flue dust based on analysis of its chemical composition and microscopic morphology. Effects of microwave power, concentration of sulfuric acid, temperature, leaching time, and L/S on zinc leaching rate and indium enrichment rate in flue dust were investigated, and phase transformation of leaching residues were analyzed. The results show that zinc leaching rate is 80.31%, indium enrichment rate is 42.23%, and end point pH value is 5.1 under the conditions including sulfuric acid concentration of 65 g/L, holding time of 10 min, leaching temperature of 50 ℃, L/S of 4 mL/g, and microwave power of 600 W. The neutral system environment is negligible for Fe leaching. This method can effectively separate zinc and indium from zinc oxide dust, and indium is successfully enriched, which provides a favorable guarantee for efficient recovery of indium in the subsequent process.
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CHANG Jun,WANG Zi-yang,YU Ju-hua,GUO Ting,LI Xue-peng.Recovery of Zinc and Enrichment of Indium from Indium-bearing Zinc Oxide Flue Dust under Microwave Assisted Neutral Leaching[J].Nonferrous Metals (Extractive Metallurgy),2022(2):69-75.