Method for preparing phosphoric acid and calcium sulfate

Details Method for preparing phosphoric acid and calcium sulfate Method for preparing phosphoric acid and calcium sulfate

C - Chemistry, Metallurgy

01

B

23/104, 23/76

C01B 25/229 (2006.01) C01B 25/228 (2006.01) C01F 11/46 (2006.01)

Patent

CA 1211919

"Method for preparing phosphoric acid and calcium sulfate". ABSTRACT There is described a method for preparing phosphoric acid and calcium sulfate, which comprises at least three succeeding crys- tallizing steps, a first step in which the phos- phate is reacted with said mixture of sulfuric and phosphoric acids in such conditions as to have the calcium sulfate crystallize in the .alpha.-hemihy- drate form, said hemihydrate being re-crystallized in a second step, into dihydrate by changing the temperature and acidity conditions, and the resul- ting dihydrate is converted in a third step, back to hemihydrate, II-anhydrite or a mixture of both these types, said calcium sulfate then being sub- jected to a separating operation, while the pro- duction phosphoric acid is removed during the first step.

450228

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