Conversion of phosphoric acid waters

Details Conversion of phosphoric acid waters Conversion of phosphoric acid waters

1993-09-14

1994-11-22

Langel, Wayne

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

210726, 210747, 210912, 210915, 423320, C02F 162

Patent

active

053666402

ABSTRACT:
Converting wet-process phosphoric acid operations, to minimize and nearly eliminate discharge of contaminants to the environment, by generation, use, and treatment of new and unique process waters. Fluorides and other contaminants soluble under acidic conditions are insolubilized, and substantially all phosphoric acid is recovered. Acid pond water from conventional wet-process phosphoric acid manufacturing is replaced by neutralized gypsum stack water having a pH closely matching that of the surroundings. Both air and ground water contamination are reduced to essentially negligible levels.

REFERENCES:
patent: 3625648 (1971-12-01), Randolph
patent: 3699212 (1972-10-01), Palm
patent: 4320012 (1982-03-01), Palm et al.
Kirk-Othmer, Encyclopedia of Chemical Technology, Third Edition, vol. 24, John Wiley & Sons (1984), pp. 300-304.
Lund, H. F., ed, "Industrial Pollution Control Handbook", McGraw Hill; New York (1971), pp. 7-35, 7-36, 14-21, 14-22.

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