Recovery of copper from chalcopyrite
CA 1069317 A · Owner: Cyprus Metallurgical Processes Corporation · Inventors: Goens, Duane N.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Chalcopyrite is converted to ferrous chloride and insoluble copper sulfides comprising covellite and chalcocite by reacting the chalcopyrite with cupric chloride and/or cuprous chloride at a temperature of at least about 110°C for sufficient time in order to convert substantially all of the reacted chalcopyrite to copper sulfides. Copper may then be conventionally recovered from the copper sulfides. In a preferred embodiment the Chalcopyrite to be treated is in the presence of one or more metal impurities selected from the group consisting of lead bismuth and, zinc, as these metal impurities will be solubilized and thereby separated from the solid copper sulfides.
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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 January 8, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 8, 1997.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.