| 摘要 |
PROBLEM TO BE SOLVED: To provide technology that efficiently manufactures high purity nickel having a purity of 5N(99.999 wt.%) or more regarding a simple method of performing electrolytic refining employing a solution containing nickel from nickel raw material containing a substantial amount of impurities. SOLUTION: Upon performing electrolysis with a solution containing nickel as the electrolytic solution, anolyte is adjusted to pH 2 to 5; impurities such as iron, cobalt and copper contained in the anolyte are eliminated by combining any one or two or more of the methods among methods adding an oxidizing agent 7 and precipitating and eliminating the impurities as hydroxide, eliminating the impurities through preliminary electrolysis, or adding Ni foil and eliminating the impurities through displacement reaction; impurities are thereafter further eliminated with a filter 8; and the impurity-free solution is employed as catholyte to perform the electrolysis. COPYRIGHT: (C)2007,JPO&INPIT |
