Patents by Inventor Larry W. Bierman

Larry W. Bierman 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).

  • Increased reduction of magnesium content by use of inorganic promoters during beneficiation of phosphate ores by flotation
    Patent number: 4642181
    Abstract: A process for beneficiating phosphate containing ores, wherein promoter reagents are added to the ore slurry prior to the addition of collectors and depressants for flotation of the carbonate and silica components. The promoters aid in increasing the rejection of the magnesium present during carbonate and silica flotation steps and recovery of phosphates, so that acceptably low magnesium levels for phosphoric acid production can be achieved in a phosphate concentrate in a single rougher stage. Preferred promoters include sodium carbonate and ammonium hydroxide.
    Type: Grant
    Filed: February 28, 1985
    Date of Patent: February 10, 1987
    Assignee: J. R. Simplot Co.
    Inventors: Samuel M. Polinsky, Larry W. Bierman, David A. Hempel