Patents Assigned to Queensland Nickel Pty. Ltd.
  • Process for the removal of cationic impurities from a cobalt sulphate solution
    Patent number: 6048506
    Abstract: A process for the separation of unwanted ferric, iron and zinc impurities from a cobalt sulphate solution containing these impurities, the process including the steps of (i) reacting the cobalt sulphate solution with an organic reagent specific for the removal of iron and zinc at an initial pH of less 2.8 to remove the majority of the unwanted ferric iron impurities; and (ii) slowly raising the pH of the solution to about 3.5 in order to remove zinc impurities and any remaining ferric iron impurities.
    Type: Grant
    Filed: November 25, 1996
    Date of Patent: April 11, 2000
    Assignee: Queensland Nickel Pty. Ltd.
    Inventors: John E. Fittock, Malcolm J. Price, John G. Reid