Fluoride removal from aqueous streams

Details Fluoride removal from aqueous streams Fluoride removal from aqueous streams

1990-04-30

1993-06-01

Niebling, John

Chemistry: electrical and wave energy

Processes and products

204 86, 204128, 204242, 210726, 210 95, 423305, 423490, 423555, C25B 114, C25B 124, C25B 900

Patent

active

052156320

ABSTRACT:
Disclosed is a method of removing fluoride and sulfate ions from an aqueous stream by adding calcium chloride and a source of phosphate ion to the stream to form a first precipitate of calcium sulfate and a compound of calcium, fluoride, and phosphate. The precipitate is separated from the aqueous stream and a source of carbonate ion is added to the stream to form a second precipitate which contains fluoride and calcium. The second precipitate is then separated from the aqueous stream.

REFERENCES:
patent: 2902418 (1959-09-01), Burns
patent: 3970528 (1976-07-01), Zirngiebl et al.
patent: 4145282 (1979-03-01), Bruckenstein
patent: 4636376 (1987-01-01), Maloney et al.
patent: 4702805 (1987-10-01), Burkell et al.
Encyclopedia of Inorganic Reactions, p. 361.
Industrial Inorganic Chemiocals, vol. 65 (1966:19746d).
Chemical Abstracts 102 (24):206019w.
Chemical Abstract 74 (6):27470t.

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