Methods and apparatus for producing phosphoric acid from phosphate ore
CA 1329979 C · Owner: Potash Corporation Of Saskatchewan Inc. · Inventors: Phinney, Robin L.; Wilson, James D.; Derdall, Gary D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to a method for the production of phosphoric acid by acidulation of phosphate ore and to an apparatus for carrying out the method. The process of this invention comprises forming a slurry of a phosphate ore in an aqueous phosphoric acid solution in each reaction zone of a multi-zone reaction system. The reaction zones are arranged in such a manner as to provide for the separation of the ore solids into two separate fractions. One fraction consists essentially of a slurry of coarse solids and calcium phosphate in the phosphoric acid solution, with a minor portion of fine solids. The other fraction consists essentially of a slurry of fine solids and calcium phosphate in …
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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 June 7, 1994. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 7, 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.