Method for production of gallium
CA 1309869 C · Owner: Engdal, Svein E. · Inventors: Engdal, Svein E.; Boe, Gunnar H.; Gundersen, Roald
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a method for selective extraction of gallium from dust which is recovered from gas collecting systems in plants for electrolytic production of aluminium. The dust is leached in an aqueous hydrochloric acid solution at a temperature between 50° and 120°C whereby gallium is leached as gallium chloride. Gallium chloride is thereafter selectively extracted from the leach solution by an organic phase consisting of undiluted tri-n-butylphosphate, whereafter gallium is stripped from the organic phase by water or an alkaline solution of NaOH with a consentration of 0.1 to 3 M, preferably 1 - 2 M.
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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 November 10, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 10, 2009.
- 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
Timeline From CIPO dates
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.