Phosphoric acid wastewater treatment

Details Phosphoric acid wastewater treatment Phosphoric acid wastewater treatment

1991-03-14

1992-12-15

Hruskoci, Peter

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

210712, 210718, 210724, 210726, 210737, 210747, 210772, 210906, 210915, 423321R, C02F 152

Patent

active

051714523

ABSTRACT:
Phosphoric acid wastewater treatment to substantially eliminate discharge of contaminants to the environment. Acid pond water from conventional wet-phosphoric acid manufacturing is replaced by gypsum pond water having a pH closely matching that of the surroundings. Essentially all fluorides are insolubilized and substantially all phosphoric acid is recovered, minimizing loss to the environment.

REFERENCES:
patent: 3625648 (1971-12-01), Randolph
patent: 3699212 (1972-10-01), Palm
patent: 3725265 (1973-04-01), Legal
patent: 3859423 (1975-01-01), Hartig
patent: 4171342 (1979-10-01), Hirko et al.
patent: 4320012 (1982-03-01), Palm et al.
patent: 4374810 (1983-02-01), O'Neill
patent: 4472368 (1984-09-01), O'Neill et al.
patent: 4493820 (1985-01-01), Clausen
patent: 4657680 (1987-04-01), Zibrida

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