Production of phosphates from alkali-processed phosphate rock

Details Production of phosphates from alkali-processed phosphate rock Production of phosphates from alkali-processed phosphate rock

C - Chemistry, Metallurgy

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C01B 25/01 (2006.01) C01B 25/28 (2006.01) C01B 25/30 (2006.01) C01B 25/41 (2006.01) C01B 25/42 (2006.01) C01B 25/445 (2006.01) C01B 25/45 (2006.01)

Patent

CA 1230958

ABSTRACT Process for production of desired phosphates from naturally occurring phosphates is characterized by treating naturally occurring phosphates under alkaline conditions to produce a material comprising trisodium and/or tripotassium orthophosphates, carbonating said material in solution, and recovering the desired phosphates from the carbonated solution. The desired phosphates include di- and mono-sodium orthophosphate; pentasodium tripolyphosphate; sodium metaphosphate and its polymers; tetrasodium pyrophosphate; ammonium phosphate; sodium ammonium hydrogen phosphate, magnesium ammonium phosphate; and the corresponding potassium salts thereof.

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