Recovery of fluorine and phosphate values from waste water

Details Recovery of fluorine and phosphate values from waste water Recovery of fluorine and phosphate values from waste water

C - Chemistry, Metallurgy

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C02F 1/00 (2006.01) A23K 1/175 (2006.01) C01B 25/22 (2006.01) C01B 25/222 (2006.01) C01B 25/32 (2006.01) C01F 11/22 (2006.01) C02F 1/52 (2006.01) C02F 1/58 (2006.01) C02F 1/66 (2006.01)

Patent

CA 1045258

ABSTRACT Calcium fluoride is produced from pond waters resulting from phosphoric acid processing by treating the pond waters with calcium carbonate in two stages to precipitate out at least 80% 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 waters. - ? 1

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