| 摘要 |
<p>PROBLEM TO BE SOLVED: To obtain a highly purified nickel sulfate soln. and to effectively recover cobalt at the time of producing refined nickel sulfate from a crude nickel sulfate soln. by reducing the consumption of a neutralizer and the waste water treating cost and removing such impurities as cobalt, calcium, magnesium, iron, zinc, copper, sodium and ammonia contained in the crude nickel sulfate soln. SOLUTION: Nickel is extracted from a crude nickel sulfate soln. having high contents of sodium and ammonia with an acidic org. extractant to obtain a nickel-holding org. phase. The nickel-holding org. phase is cleaned with a nickel-contg. cleaning soln., the cleaned org. phase is allowed to react with an aq. crude nickel sulfate soln. having especially a high content of cobalt to substitute the nickel in the org. phase for the impurities in the aq. acrude nickel sulfate soln., and a refined nickel sulfate soln. and an org. phase concentrated in cobalt are obtained.</p> |
