Process for the manufacture of a slurry containing highly concen

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

1976-08-02

1978-07-18

Vertiz, O. R.

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

423167, 423555, C01B 2516

Patent

active

041016386

ABSTRACT:
The present invention relates to a wet process for the manufacture of phosphoric acid, which process essentially comprises 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 hemihydrate from the highly concentrated phosphoric acid (in which the concentration of P205 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.

REFERENCES:
patent: 1969449 (1934-08-01), Bryan
patent: 3505013 (1970-04-01), Araki et al.
patent: 3653826 (1972-04-01), Ishihara et al.

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