Method for treatment of potlining residue from primary aluminium smelters
CA 2082341 A1 · Owner: Johnsen, Terje · Inventors: Johnsen, Terje; LINDKVIST, JON GõRAN
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Method for treatment of spent potlining from aluminium reduction cells included the refractory material in order to transfer the spent potlining to a form in which it can be used as a filler or as a raw material. The spent potlining is crushed and supplied lo a closed electrothermic smelting furnace optionally together with a SiO2 source. wherein the spent potlining is melted at a temperature between 1300 and 1750°C. An oxidation agent is supplied to the furnace in order to oxidize carbon and other oxidizable components contained in the spent potlining such as metals carbides and, nitrides. Further, a source of calcium oxide is supplied to the smelting furnace in an amount necessary to …
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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 November 6, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 6, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 6, 2014.
- 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.