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電解酸化法および沈殿法による硫酸亜鉛溶液中の塩化物イオンの除去 Removal of chloride ion from acidic zinc sulfate solution by electrolytic oxidation and precipitation 高崎, 康志 渡辺, 斉 小池, 一男 TAKASAKI, Yasushi WATANABE, Hitoshi KOIKE, Kazuo open access Zinc electrowinning Electrolytic oxidation Removal of chloride Precipitation Anode Pb-Ag-Ca alloy During the hydrometallurgical extraction process of zinc, the elimination of chloride ions from the electrolyte is an important issue, because the contamination of the anode by chloride ion promotes the dissolution of Pb from the anode and raises the Pb content in the zinc cathode. In this study, two fundamental nvestigations were carried out. One involved the anodic oxidation behaviors of zinc sulfate solutions, while the other was concerned with the elimination process of chlorides ions as precipitations by adding copper powder to the solution. The concentration of chloride ion was reduced to about 50 ppm by electrolytic oxidation using Pb-alloyanodes (Pb-Ag and Pb-Ag-Ca). However, the rate of decrease in the chloride ion concentration was not very rapid when using the Pb-alloy anodes compared when using catalytic activated anodes (Pt, Ti/Ru02). Chloride ions can be removed as CuCl by the addition of copper powder. However, it was found that the presence of a large amount of copper ion [Cu2+J in the solution was required for the more effective elimination of the chloride ions. 日本素材物性学会 2003-12-01 jpn journal article VoR http://hdl.handle.net/10295/1235 https://air.repo.nii.ac.jp/records/1285 素材物性学雑誌 16 2 86 92 https://air.repo.nii.ac.jp/record/1285/files/sozai16b9.pdf application/pdf 769.8 kB 2017-02-16