Treatment of roasted metal sulphide ores and ferrites by leaching with peroxysulphuric acid
CA 2334511 A1 · Owner: Ortech Corporation · Inventors: Lakshmanan, Vaikuntam Iyer; Rishea, Marc Murray; Hanna, Michael Mourad
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for the treatment of a roasted metal sulphide ore for the , separation of metals therefrom. The process comprises leaching the roasted ore with peroxysulphuric acid, optionally in the presence of chlorine and , separating a solution containing metals. The process is particularly useful in separating copper and zinc from sulphide ores of those metals in particular , when the ore has been subjected to a dead roast or to a sulphation roast and the roasted ore contains then metal ferrites which otherwise require high acid concentrations and high leach temperatures for metal recovery 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 June 9, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 9, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 9, 2021.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
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.