選択的沈殿剤としてのザンセートの利用 (第2報)

ニッケル, コバルトの分離とザンセートの回収

抄録

A study on the separation of nickel and cobalt from a solutions containing Fe²⁺, Cr²⁺ and Mn²⁺ has been made using ethyl xanthate as a precipitant. Owing to the strong hydrophobic property of nickel and cobalt xanthates, it was possible to remove the precipitate of nickel and cobalt xanthates from the solution by the flotation technique. Nickel and cobalt xanthates were separated satisfactorily from each other by washing with ammonia water ; cobalt xanthate remains as an unaltered precipitate while nickel xanthate is dissolved by aqueous ammonia solution to give an ammine solution. Nickel sulfide was obtained when the solution was treated with sodium sulfide. The filtrate from which nickel sulfide was removed was a solution containing ammonia and xanthate. Xanthate in the solution was recovered over 90% and was identified by UV spectra.
Similarly, when sodium hydroxide or calcium hydroxide were used in place of ammonia, nickel xanthate turned to nickel hydroxide and xanthate is recovered over 90%