Process for the recovery of aluminum and iron salts from acidic waste waters
CA 1201422 A · Owner: Sued-Chemie Aktiengesellschaft · Inventors: Buckl, Hans; Fahn, Rudolf
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Aluminum and iron salts contained in acidic waste waters are recovered by precipitation by means of an alkaline earth precipitating agent. The precipitate in the form of aluminum hydroxide and ferric oxide hydrate is separated from the supernatant liquid and the aluminum hydroxide is leached out of the ferric oxide precipitate by treatment with sodium hydroxide. The sodium hydroxide converts the aluminum hydroxide over to sodium aluminate which is further treated with sodium silicate and additional sodium hydroxide to form a crystalline zeolite. The remaining iron oxide hydrate is washed and dried and may be pelleted for use as a gas purification substance or calcined to to the iron oxide …
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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 March 4, 1986. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 4, 2003.
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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.