Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Alkaline earth metal
Patent
1977-12-22
1979-10-16
Carter, Herbert T.
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Alkaline earth metal
210 45, 210 51, 210 53, 423158, 423163, 423178, 423490, C01F 1122
Patent
active
041713427
ABSTRACT:
Calcium fluoride is produced from pond waters resulting from phosphoric acid processing by treating the pond waters with calcium carbonate and/or calcium oxide in two stages to precipitate out the major part of the fluorine values from the waters as calcium fluoride. After removal of the calcium fluoride the filtrate is treated with calcium oxide to remove a substantial portion of the remaining fluorine values as calcium fluoride. After removal of these calcium fluoride solids, the filtrate is treated with another charge of calcium oxide to produce dicalcium phosphate (dical) which is separated from the aqueous phase. The aqueous phase is treated with an additional charge of calcium oxide to remove a substantial portion of the solids from the aqueous phase leaving waters that can be discharged as waste or recycled as process water.
REFERENCES:
patent: 2780523 (1957-02-01), Gloss
patent: 2889200 (1959-06-01), LeBaron
patent: 3551332 (1970-12-01), Baumann et al.
patent: 3625648 (1971-12-01), Randolph
patent: 3699212 (1972-10-01), Palm
Hirko Ronald J.
Mills Harold E.
Bisson Barry A.
Carter Herbert T.
Occidental Chemical Company
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