Process for preparing phosphoric acid

Details Process for preparing phosphoric acid Process for preparing phosphoric acid

1976-07-28

1978-01-31

Vertiz, O. R.

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

423555, C01B 2516, C01F 1146

Patent

active

040716031

ABSTRACT:
In a process for preparing phosphoric acid by contact of sulphuric acid and phosphate rock with filtration of the gypsum slurry and recycle of the rest for contact with fresh rock, a fraction of the recycle slurry is treated with sulphuric acid to convert at least some of the gypsum to calcium sulphate hemihydrate and the slurry comprising hemihydrate is returned to contact the mixture of phosphate rock, phosphoric acid and recycle gypsum slurry. The process gives an easily filtered gypsum slurry with low phosphate losses in the gypsum filter cake.

REFERENCES:
patent: 3416887 (1968-12-01), Matsubara et al.
patent: 3418077 (1968-12-01), Robinson
patent: 3453076 (1969-01-01), Long et al.
patent: 3505013 (1970-04-01), Araki et al.
patent: 3522003 (1970-07-01), Lopker
patent: 3523754 (1970-08-01), Yasutake et al.
patent: 3552918 (1971-01-01), Fitch et al.
patent: 3627485 (1971-12-01), Hori et al.

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