Recovery of P.sub.2 O.sub.5 values from phosphoric acid hemihydr

Details Recovery of P.sub.2 O.sub.5 values from phosphoric acid hemihydr Recovery of P.sub.2 O.sub.5 values from phosphoric acid hemihydr

1988-07-11

1989-08-01

Heller, Gregory A.

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

423555, C01B 2516

Patent

active

048532010

ABSTRACT:
P.sub.2 O.sub.5 values occluded in the crystals which are precipitated during the hemihydrate process for manufacturing phosphoric acid are recovered by dissolving and recrystallizing the hemihydrate crystals as dihydrate crystals in an acidic environment having a P.sub.2 O.sub.5 concentration of from about 0.1% to about 10% and a free sulfate concentration in the range of about 0.1% to about 10%. Water is used to wash the dihydrate filter cake, and the filtrate from this wash is used to redissolve the hemihydrate crystals. The free sulfate values are preferably supplied to the dihydrate crystallizer as sulfuric acid.

REFERENCES:
patent: 3511602 (1970-05-01), Fitch et al.
patent: 3745208 (1973-09-01), Bigot et al.
patent: 4522918 (1971-01-01), Fitch et al.

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