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