Method for precipitation of chromium and/or vanadium from waste sulphuric acid from the titanium dioxide production
CA 1329005 C · Owner: Sulzer-Escher Wyss Ag · Inventors: Bansal, Parmanand; Wiesmann, Hans
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Waste sulphuric acid resulting from the titanium dioxide production is concentrated by evaporation followed by an aging process during which the metals, except chromium and vanadium are, precipitated. In order to sufficiently precipitate chromium and vanadium in a reasonably short time, the evaporated waste sulphuric acid is mixed with aluminum having an active surface which, may be achieved by comminution e.g. cutting or pulverization not more than 4 hours before adding it to the waste sulphuric acid.
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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 May 3, 1994. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 3, 2011.
- 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.