Hydrometallurgical process for the recovery of nickel and cobalt by ammoniacal leaching
CA 2256560 A1 · Owner: Castellanos Suarez, Jose · Inventors: Lobaina Urtafe, Isabel; Alvarez Villanueva, German A.; Escalona, Rodriguez, Milagros
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present is a hydrometallurgical process for nickel and cobalt recovery which involves leaching with ammonia-ammonium carbonate solution of the nickel and cobalt bearing mineral material, using a tubular reactor (4) with air or oxygen injection (5), said mineral material is previously submitted to selective reduction and cooling. The new ammonia leaching process followed by , liquid/solid separation (7) and/or nickel and/or cobalt extraction by solvent or ion-exchange resin, allows the recovery of all the extractable nickel and up to the 130 % cobalt extraction reported by the standard ammonia-ammonium leaching.
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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 6, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 6, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 6, 2020.
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Timeline
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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.