Production of phosphates from alkali-processes phosphate rock

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

1987-02-09

1988-10-11

Doll, John

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

423167, 423306, 423307, 423308, 423311, 423312, 423314, 423315, C01B 2516

Patent

active

047770260

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.

REFERENCES:
patent: 2220790 (1940-11-01), McCullough
patent: 4106922 (1978-08-01), Hauschild et al.
Skoog et al, Fundamentals of Analytical Chemistry, (1963), Holt, Rinehart and Winston, pp. 180-182.
Chemical Abstracts, 70, 36700n.
Chemical Abstracts, 72, 2723y.
Chemical Abstracts, 72, 68719h.

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