C - Chemistry – Metallurgy – 01 – B
Patent
C - Chemistry, Metallurgy
01
B
23/384, 23/76
C01B 25/22 (2006.01) B01J 19/00 (2006.01) C01B 25/237 (2006.01)
Patent
CA 1045339
ABSTRACT OF THE DISCLOSURE Process and apparatus for purifying crude wet-processed phosphoric sold containing free sulphuric acid. To this end, the wet-processes phosphoric acid is treated in a reaction zone, at a temperature of 70°C to 100°C, with a calcium compound and with calcium sulphate seed crystals; the sulphate acid is precipitated in the form of calcium sulphate semihydrate with the resultant formation of a suspension; a proportion of the suspension, with the calcium sulphate semihydrate seed crystals present therein, is recycled to the reaction zone; the balance of the sus- pension is treated for separation of purified phosphoric acid from the accompanying precipitate; the precipitate is transformed into an aqueous suspension and the calcium sulphate semihydrate in said suspension is converted into calcium sulphate dihydrate; the aqueous phase of the sus- pension is separated from the solid matter therein, and the solid matter is water-washed; a proportion of the aqueous phase so separated in recycled together with a pro- portion of the wash water, for use in suspending and con- verting calcium sulphate semihydrate to dihydrate; and the balance of the aqueous phase and wash water are com- bined with the said purified phosphoric acid.
235803
Ehlers Klaus P.
Heymer Gero
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