Method of treating alunite ore
CA 1066025 A · Owner: National-Southwire Aluminum Company · Inventors: Stephens, Frank M. (Jr.); Jennings, Larry D.; Bowen, Francis J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
INVENTORS, Douglas STEVENS, Helge Ole FORBERG Larry Dean JENNINGS, Frank Moe STEPHENS Jr. Francis John BOWEN, TITLE, METHOD OF TREATING ALUNITE ORE, ABSTRACT OF THE DISCLOSURE This invention relates to a method for recovering aluminum hydroxide from ore containing alunite by roasting the ore to remove the water of hydration leaching the, roasted ore with a weak base to remove potassium and sulfate extracting the aluminum content with a mixture of sodium hydroxide and potassium hydroxide and pre-, cipitating aluminum hydroxide crystals from the solution. When a mixture of sodium hydroxide and potassium hydroxide is used to digest the leached ore the sulfates, recovered are useful as …
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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 13, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 13, 1996.
- 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.