Patents Assigned to Hemlo Gold Mines Inc.
  • Process for the removal of cyanide and other impurities from solution
    Patent number: 4840735
    Abstract: A process for the removal of cyanide and other impurities from an aqueous solution is disclosed. The process comprises adding copper ion and ferrous ion as reagents to the solution at a pH of about 4 to 8 with a ratio of copper to cyanide in the range of 3:1 to 10:1 by weight and with a ratio of iron to copper of at least 0.3:1 by weight.
    Type: Grant
    Filed: May 3, 1988
    Date of Patent: June 20, 1989
    Assignee: Hemlo Gold Mines Inc.
    Inventor: Ernest Goodwin