Neutralization of phosphoric acid waste waters

Details Neutralization of phosphoric acid waste waters Neutralization of phosphoric acid waste waters

1980-08-07

1982-03-16

Castel, Benoit

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

210724, 210906, 210915, 423163, 423321R, C02F 152

Patent

active

043200125

ABSTRACT:
Method for neutralizing waste cooling pond waters of wet process phosphoric acid plants, and for neutralizing similar waste waters from phosphate complexes, wherein neutralization is performed in two stages and wherein the flocculent precipitate from the second neutralization stage is disposed of by dissolving it in incoming untreated waste water prior to the first neutralization stage. Neutralization in the first neutralization stage is accomplished by addition of limestone to the waste water, and neutralization in the second neutralization stage is accomplished by addition of limestone to the water phase from the first neutralization stage. The precipitate from the first neutralization stage is readily separable from the liquid phase, and is suitable for disposal in the gypsum stack of a wet process phosphoric acid plant. The fully neutralized water meets federal and state requirements for disposal in surface and underground water systems as to pH and as to fluoride and phosphate content. Lime, instead of limestone, may be used for neutralization in the first neutralization stage, but this procedure will increase operating costs somewhat in most cases.

REFERENCES:
patent: 3493340 (1970-02-01), Bosen et al.
patent: 3650686 (1972-03-01), Hudson et al.
patent: 3725265 (1973-04-01), Legal, Jr.
Mooney, G. A. et al.; "Removal of Fluoride and Phosphorus from Phosphoric Acid Wastes with Two Stage Line Treatment"; Proceed of the 33rd Ind. Waste Conf., Purdue Univ., (1978).
Mooney et al.; "Laboratory and Pilot Treatment of Phosphoric Acid Wastewaters"; presented at the A.I.C.E., 1977, Joint Meeting of Central Fla. and Peninsular, Florida.

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