Recovery of nickel and cobalt values from a sulfidic flotation concentrate by chloride assisted oxidative pressure leaching in sulfuric acid
CA 2376883 C · Owner: Love, Bruce John · Inventors: Singhal, Avinash; Krause, Eberhard; Kerfoot, Derek G.E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
There is provided a process for the recovery of nickel and cobalt values from a sulfidic flotation concentrate. The process involves forming a slurry of the flotation concentrate in a sulfuric acid solution and subjecting the slurried , flotation concentrate to a chlorine leach at atmospheric pressure followed by an oxidative pressure leach at elevated temperature under acidic conditions. After liquid-solids separation, purification and cobalt removal the nickel-, containing solution is directly treated by electrowinning to recover nickel cathode therefrom.
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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
- Filed February 26, 2001 and granted December 3, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 26, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 26, 2023.
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.