Production of pure alkali metal phosphate solutions from wet-pro

Details Production of pure alkali metal phosphate solutions from wet-pro Production of pure alkali metal phosphate solutions from wet-pro

1977-02-23

1979-01-16

Vertiz, O. R.

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

423309, 423321R, C01B 1516, C01B 2526, C01B 2516

Patent

active

041349628

ABSTRACT:
Alkali metal phosphate solutions (alkali metal oxide : P.sub.2 O.sub.5 - molar ratio greater than 1.9 : 1) of reduced vanadium and chromium contents are made from wet-processed phosphoric acids which are neutralized by means of an alkali metal hydroxide and/or carbonate. The alkali metal phosphate solutions contain less than 20 ppm of vanadium and less than 1 ppm of chromium and are made by stepwise neutralization. More specifically the acid is neutralized in a first step to an alkali metal oxide to P.sub.2 O.sub.5 - molar ratio of 1.0 : 1 to 1.8 : 1; resulting precipitate is separated and resulting solution is admixed with iron(II)salt at 60 to 90.degree. C. Next, the acid is neutralized in a second step to an alkali metal oxide to P.sub.2 O.sub.5 - molar ratio greater than 1.9 : 1, and resulting precipitate is separated again.

REFERENCES:
patent: 2174138 (1939-09-01), Kepfer et al.
patent: 3305305 (1967-02-01), Peterson et al.
patent: 3421845 (1969-01-01), Peterson
patent: 3493336 (1970-02-01), Milling

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