Process for purifying water containing fluoride ion

Details Process for purifying water containing fluoride ion Process for purifying water containing fluoride ion

1979-02-12

1980-10-07

Castel, Benoit

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

423163, 210724, 210915, C02B 120

Patent

active

042267102

ABSTRACT:
A process for purifying water containing fluoride which comprises precipitating fluoride from the water as fluorapatite in the presence of a bed of seeding composition. Fluoride is removed as fluorapatite by having sufficient available calcium for each mole of fluoride present in the water and sufficient available phosphate for each mole of fluoride in the water to form a precipitate which is or converts to sufficient fluorapatite to remove essentially all fluoride from the water.

REFERENCES:
patent: 2380800 (1945-07-01), Smith et al.
patent: 3284350 (1966-11-01), Williamson
patent: 3467496 (1969-09-01), English et al.
patent: 3552918 (1971-01-01), Fitch et al.
patent: 4028237 (1977-06-01), Nishimura et al.
patent: 4145282 (1979-03-01), Bruckenstein

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