Patents Assigned to Outukumpu OY
  • Removing zinc from a nickel solution by extraction
    Patent number: 4125587
    Abstract: A process for removing zinc from an aqueous solution of a nickel salt by liquid-liquid extraction using as the extraction agent an organic phosphoric acid dissolved in an organic solvent, adding a strongly oxidizing substance at an elevated temperature to the aqueous phase emerging from the extraction to precipitate the cobalt as a hydroxide and decompose the organic phase left in the aqueous phase and to adsorb it into the cobalt hydroxide precipitate, and finally separating it from the pure aqueous nickel salt solution.
    Type: Grant
    Filed: October 12, 1977
    Date of Patent: November 14, 1978
    Assignee: Outukumpu OY
    Inventors: Raimo J. Leimala, Matti Seilo