High-purity electrolytic copper and electrolytic refining method thereof
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United States of America Patent
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Oct 10, 2017
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Jun 11, 2013
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Jun 14, 2012
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Abstract
This electrolytic refining method of high-purity electrolytic copper includes: performing electrolysis by using an electrolyte which includes a copper nitrate solution, a cathode made of stainless steel, and an anode made of copper so as to deposit high-purity electrolytic copper on the cathode.
- (a) The electrolyte includes a mixture of polyethylene glycol and polyvinyl alcohol at a content of 20 ppm or more as an additive.(b) When a molecular weight of the polyethylene glycol is given as Z and a current density during the electrolysis is given as X (A/dm2), the electrolysis is performed under conditions that fulfill the following relational expressions,1000≦Z≦20001.2−(Z−1000)×0.0008≦X≦2.2−(Z−1000)×0.001.
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