Patents Assigned to Compagne Francaise D'Entreprises Minieres, Metallurgiques et D'Investissements
  • Controlling scale composition during acid pressure leaching of laterite and garnierite ore
    Patent number: 4415542
    Abstract: The scaling of autoclave and leaching-equipment surfaces during the high pressure leaching of nickeliferous oxide and silicate ores is controlled during leaching to favor the formation of scale containing substantial amounts of magnesium sulfate that is more easily removed by chemical dissolution using water or dilute sulfuric acid at temperatures ranging from about 50.degree. C. to 250.degree. C. than scale containing substantial amounts of alunite.
    Type: Grant
    Filed: June 21, 1982
    Date of Patent: November 15, 1983
    Assignee: Compagne Francaise D'Entreprises Minieres, Metallurgiques et D'Investissements
    Inventors: Paul B. Queneau, Robert E. Doane, Mark H. Berggren, Mark W. Cooperrider