Process for leaching noble metals from ores and ore concentrates with cyanidic solutions while adding hydrogen peroxide
CA 1331518 C · Owner: Degussa Aktiengesellschaft · Inventors: Lorosch, Jurgen; Griffiths, Andrew; Knorre, Helmut
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a process for leaching gold and/or silver from ores or ore concentrates using an aqueous alkaline cyanide solution with addition of hydrogen peroxide. The industrial application of this process has hitherto been hampered by its lack of economy, i.e. the consumption of H2O2 and NaCN was too high. According to the invention it has been found that the process can be made very economical and that disadvantages of the conventional leaching process can be avoided if the addition of the aqueous H2O2 solution is regulated through the concentration of the oxygen dissolved in the leaching solution the leaching, solution containing from 2 to 20 mg O2 and preferably from 7 to …
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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 August 23, 1994. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 23, 2011.
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Timeline
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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.