Study on Extraction Separation Process of In,Ga and Ge from Weak Acid Leaching Solution of Secondary Zinc Oxide AITranslate

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Chinese Library Classification Number:TF843.1[冶金工程—有色金属冶金]

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Taking the weak acid leaching solution of secondary zinc oxide that is a by-product from the lead-zinc smelting system as the research subject,solvent extraction was employed to recover In,Ga,and Ge from it.The effects of solution pH value and the synergistic extractant YW100 on the extraction rates of In,Ga,and Ge were investigated through a series of extraction experiments.Suitable stripping agents and selective extraction separation processes for In,Ga and Ge were determined.The experimental results reveal that Fe³⁺significantly impacts the extraction of Ga and Ge,so it is necessary to reduce the Fe³⁺in the leaching solution before extraction.In the P204 extraction system,the extraction rate of In reaches 99.99%,while Ga and Ge are hardly extracted.The In-loaded organic phase is stripped with 6 mol/L hydrochloric acid,and the In stripping rate is close to 90%.Subsequently,the synergistic extraction system of P204+YW100 is used to extract Ga and Ge from the raffinate.The extraction rates of Ga and Ge reach 93.30%and 98.90%,respectively.The Ga-and Ge-loaded organic phase is first stripped with 6 mol/L sulfuric acid to recover Ga(achieving a stripping rate of 65%),followed by Ge stripping using sodium hypochlorite or ammonium fluoride solution,which yields a Ge stripping rate of approximately 90%.The selective extraction separation of In,Ga and Ge from the weak acid leaching solution of secondary zinc oxide have been realized,and the goal of efficient recycling and utilization of resources has been achieved.