Production of electrolytic copper from dilute solutions contaminated by other metals
CA 2245018 A1 · Owner: Ecochem Aktiengesellschaft · Inventors: Zoppi, Gianni
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The copper is selectively precipitated in the form of a sulfide from the solutions containing it according to, the reaction:, CU2+ + S2 ~ CuS The precipitated solid, constituted by copper sulfide is filtered, washed and then leached with a solution of ferric fluoborate and fluoboric acid, which dissolves the copper as a fluoborate while forming elemental sulfur, according to the reaction:, CuS + 2Fe (BF4)3 ~ Cu (BF4)2 + 2Fe (BF4)2 + S° After filtering off the sulfur, the copper fluoborate solution is subjected to an electrolysis in a diaphragm cell, obtaining a deposit of pure copper at the cathode and a regenerated solution of ferric fluoborate at the anode, which is utilized to leach …
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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 August 13, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 13, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 13, 2020.
- 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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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.