Patents Assigned to Swarsab Mining, Exploration & Development Company (Proprietary) Limited
  • Separation and/or purification of precious metals
    Patent number: 3997337
    Abstract: A process for the treatment of a concentrate of by-metals comprises heating he concentrate at between 1100.degree. C and 1500.degree. C, preferably at about 1300.degree. C, in a gaseous stream which comprises oxygen. The heating step is effected for a period of time sufficient to ensure quantitative removal of one or more of lead, arsenic, silver, bismuth and/or tellurium and the oxidation of ruthenium, rhodium and iridium to their oxides.
    Type: Grant
    Filed: August 29, 1975
    Date of Patent: December 14, 1976
    Assignee: Swarsab Mining, Exploration & Development Company (Proprietary) Limited
    Inventors: Willem H. Pittie, Gerhardus Overbeek