Patents by Inventor Heimo U. A. Saarinen

Heimo U. A. Saarinen has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Selective two stage leaching of nickel from nickel-copper matte
    Patent number: 4323541
    Abstract: A finely-ground nickel-copper matte is leached using an acid at a minimum temperature of approx. 80.degree. C. and under oxidizing conditions in order to produce a nickel sulfate solution and a nickel-cooper sulfide residue, which is separated from the solution and thereafter the nickel-copper sulfide residue is leached using acid in an autoclave at a minimum temperature of 110.degree. C. and under oxidizing conditions in order to produce an additional quantity of nickel sulfate solution and a copper sulfide precipitate.
    Type: Grant
    Filed: June 18, 1980
    Date of Patent: April 6, 1982
    Assignee: Outokumpu Oy
    Inventors: Heimo U. A. Saarinen, Matti Seilo