| 摘要 |
The method for electrolytically refining copper herein described makes use of crude copper as an anode and is characterized in that the temperature of the electrolyte in an electrolytic cell is maintained at a level of not less than 55 DEG C; that the electrolyte is continuously introduced into the electrolytic cell from the top of the cell, continuously discharged from the bottom of the cell along with slime, the slime is removed from the electrolyte discharged from the electrolytic cell and the electrolyte free of any slime is recirculated in the cell; and that the electrolyte is passed through the space between the electrodes at an average electrolyte velocity sufficient for allowing the electrolyte to flow on the whole surface of the cathode downward or in the direction opposite to that of the upward stream of the electrolyte generated on the cathode surface when the electrolysis is initiated while the electrolyte is in the stationary state. The use of the foregoing electrolytic refining method would permit the production of electrolytically refined copper, which has only a low content of impurities such as S, As, Sb and Bi, without causing any passivation of the anode even when copper is electrolytically refined at a high current density, any adhesion of slime to the cathode surface and generation of any nodule (particulate copper) and/or wrinkle-like unevenness on the cathode surface. <IMAGE> |
