HIGH-PURITY ELECTROLYTIC COPPER AND ELECTROLYTIC REFINING METHOD THEREOF

摘要

PROBLEM TO BE SOLVED: To provide an electrolytic refining method of high-purity electrolytic copper, by which a S content in precipitated copper can be adjusted to ≤0.01 ppm, even when repeating electrolysis, without requiring any large equipment.

SOLUTION: The electrolytic refining method of the high-purity electrolytic copper using an electrolyte comprising a copper nitrate solution comprises: (a) adjusting the sulfur (S) content in the electrolyte to ≤20 ppm; (b) adding polyethylene glycol (PEG) and polyvinyl alcohol (PVA) as additives; and (c) adding chlorine ions and performing electrolysis.

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