Wet process phosphoric acid produced using gypsum-containing was

Details Wet process phosphoric acid produced using gypsum-containing was Wet process phosphoric acid produced using gypsum-containing was

1976-06-17

1978-09-26

Vertiz, O. R.

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

423555, C01B 2516

Patent

active

041170911

ABSTRACT:
Diluted sulfuric acid used in the production of wet process phosphoric acid is obtained by the admixing of gypsum-containing waste water with concentrated sulfuric acid and subsequently cooling in a liquid-to-liquid heat exchanger. By maintaining the concentration of the diluted acid at from about 65 to 80% H.sub.2 SO.sub.4, harmful formation of scale in the heat exchanger is prevented. The process permits the recovery of P.sub.2 O.sub.5 values from gypsum-containing waste waters and does not require expensive dilution tanks or flash coolers.

REFERENCES:
patent: 3493340 (1970-02-01), Bosei et al.
patent: 3498746 (1970-03-01), Smaltz et al.
patent: 3498747 (1970-03-01), Smaltz et al.
patent: 3699212 (1972-10-01), Palm
Phosphoric Acid-Slack, vol. 1, 1968, pp. 227-279.

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