Patents by Inventor Peter Frederic Wells

Peter Frederic Wells 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).

  • Arsenide depression in flotation of multi-sulfide minerals
    Patent number: 7004326
    Abstract: A mineral separation process includes wet-grinding the ore to liberation of minerals, oxidizing the slurry using air, hydrogen peroxide or other oxidants and floating the valuable minerals at a pH between about 9.0 and 10.0 with a xanthate as collector, and a combination of a polyamine and a sulfur containing species as depressants for arsenide minerals. This depressant suite effectively depresses the flotation of arsenide minerals with no effect on the flotation of the valuable minerals.
    Type: Grant
    Filed: October 7, 2004
    Date of Patent: February 28, 2006
    Assignee: Inco Limited
    Inventors: Zongfu Dai, Julie-Ann Arlene Garritsen, Peter Frederic Wells, Manqiu Xu