Recovery of gold from auriferous refractory iron- containing sulphidic material
CA 1234291 A · Owner: Genik-Sas-Berezowsky, Roman M. · Inventors: Genik-Sas-Berezowsky, Roman M.; Weir, Donald R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
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A process for recovering gold from refractory auriferous iron containing sulphidic material which comprises treating an aqueous slurry of the material in a pressure oxidation step at a temperature in the range of from about 135 to about 250°C under a total pressure of from about 500 to about 5000 kPa to oxidize sulphide sulphur to sulphate form and release gold from a refractory state. The pH of the resultant oxidized slurry is adjusted to a value suitable for cyanidation. The pH adjusted slurry is subjected to a cyanidation step in which gold is dissolved in a cyanide solution. The cyanided slurry is diluted to a pulp density in the range of from about 2 to about 10% solids by weight. The …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted March 22, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 22, 2005.
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.