Production of alkali metal phosphate solutions of low vanadium c

Details Production of alkali metal phosphate solutions of low vanadium c Production of alkali metal phosphate solutions of low vanadium c

1976-06-22

1977-10-11

Vertiz, O. R.

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

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

Patent

active

040535622

ABSTRACT:
Alkali metal phosphate solutions of low vanadium content are produced from wet-processed phosphoric acids contaminated with vanadium and iron. The acids containing vanadium and iron in the highest stage of oxidation are treated with a reductant to effect conversion of the vanadium and iron contaminants to a lower stage of oxidation, the resulting acids are neutralized by means of an alkaline liquor and/or alkali metal carbonate down to a pH of at least 3, and the resulting precipitate is separated. The reductant used is the sodium salt of hydroxymethane-sulfinic acid.

REFERENCES:
patent: 2150921 (1939-03-01), Havas
patent: 2977191 (1961-03-01), Poltiez
patent: 3042609 (1962-07-01), Hughes
patent: 3305305 (1967-02-01), Peterson
patent: 3493336 (1970-02-01), Milling

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