Mist suppressant for solvent extraction metal electrowinning
CA 1191812 A · Owner: Minnesota Mining And Manufacturing Company · Inventors: Olson, Maynard H.; Bultman, David A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a process for the recovery of elemental metal values from ores and processing liquids by solvent extraction-eletrowinning. The process involves extracting metal values by means of an aqueous strip solution containing strong acid such as sulphuric or phosphoric acid. The aqueous strip solution containing the metal values is used as electrolyte in an electroplating process to electrowin the metal values. A problem which has arisen is that oxygen evolved at the anode during electroplating entrains the strong acid electrolyte, to form a fine mist or spray which is corrosive and constitutes a health hazard. In the present invention the aqueous strip solution contains, …
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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 August 13, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 13, 2002.
- 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.