| 摘要 |
<p>PURPOSE:To produce high-purity copper with good productivity by conducting electrolysis in an electrolytic bath obtained by dissolving CuCl and imidazolium halide in org. solvent using a Cu anode and a cathode and melting the Cu electrodeposited on the cathode in vacuum. CONSTITUTION:CuCl or CuCl2 and imidazolium halide (1-methyl-3- ethylimidazolium chloride, etc.) are dissolved in org. solvent (benzene, etc.) in the molar ratio of about 1/4-4/1 to prepare an electrolytic bath. At this time, the CuCl or CuCl2 having a low content of Ag is used. The Cu anode as the raw material and the cathode to be electrodeposited with Cu are arranged in the bath in opposition to each other, and electrolysis is conducted at about 0-150 deg.C bath temp. and about 0.1-30A/dm<2> current density. The Cu obtained by the electrolysis is melted in vacuum, or oxidation-melted in the atmosphere and then melted in vacuum. Consequently, copper having about 99.999 to 99.9999% purity is obtained with good productivity.</p> |
