Patents Assigned to TCM RESEARCH LTD.
  • Extraction methods from refractory ores
    Patent number: 11401578
    Abstract: A method for extracting and separating Gold, Silver, Copper, Zinc and/or Lead from an Arsenic-containing ore, concentrate or tailings characterized in that the extraction is carried by roasting in the presence of a calcium-containing material and at least one of an alkali metal halide and alkaline metal halide. In the method, Arsenic remains immobilized in the extraction residue.
    Type: Grant
    Filed: November 10, 2017
    Date of Patent: August 2, 2022
    Assignee: TCM RESEARCH LTD.
    Inventors: Dmitri S. Terekhov, Colwyn S. van der Linde