Process for the manufacture of a slurry containing highly...

Details Process for the manufacture of a slurry containing highly... Process for the manufacture of a slurry containing highly...

C - Chemistry, Metallurgy

01

B

23/76

C01B 25/22 (2006.01)

Patent

CA 1067675

ABSTRACT The present invention relates to a wet process for the manufacture of phosphoric acid, which process essentially com- prises a digestion step in which phosphate rock is digested by means of phosphoric acid and sulfuric acid to form a slurry containing highly concentrated phosphoric acid together with calcium sulfate hemihydrate, and a separation step in which the slurry is filtered for separation of calcium sulfate hemi- hydrate from the highly concentrated phosphoric cold (in which the concentration of P2O5 in the product acid is higher than 40% by weight, based on the weight of the product acid) and which is characterized by supplying active silica at a ratio of 0.2 - 5% by weight, based on the weight of phosphate rock, in order that active silica may be present in the above mentioned digestion step.

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