Patents by Inventor Eugene J. Michal

Eugene J. Michal 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).

  • Hydrometallurgical refining of nickeliferous sulfides
    Patent number: 4214901
    Abstract: Nickeliferous sulfidic materials containing at least one other metal selected from the group consisting of cobalt, copper and iron are leached with an at least 3 N hydrochloric acid solution to produce a pregnant nickel chloride solution. The pregnant nickel chloride solution is treated with a liquid organic extractant to extract the other metals. The nickel chloride raffinate is concentrated with respect to nickel chloride, and the concentrated nickel chloride solution is heated to at least about 750.degree. C. to hydrolyze the nickel chloride to a refined nickel oxide product and a hydrogen chloride-containing gaseous effluent which is recycled to the concentration step and then through water to regenerate the leaching solution.
    Type: Grant
    Filed: February 16, 1979
    Date of Patent: July 29, 1980
    Assignee: Amax Inc.
    Inventors: Eugene J. Michal, Simon O. Fekete, H. Jan Roorda