Process for reducing aluminum and fluorine in phosphoric acids

Details Process for reducing aluminum and fluorine in phosphoric acids Process for reducing aluminum and fluorine in phosphoric acids

1981-07-13

1983-04-12

Vertiz, O. R.

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

423166, 423320, C01B 2516

Patent

active

043797768

ABSTRACT:
Aluminum fluorophosphate can be produced by the aging of phosphoric acid containing fluorine and aluminum, preferably phosphoric acid analyzing in the range of about 15-45 weight percent P.sub.2 O.sub.5, 2-4% Al.sub.2 O.sub.3 and 1-2% fluorine. One process involves digestion of phosphate ore matrix in recycled phosphoric acid, filtration of the insoluble residue, precipitation and filtration of gypsum, and aging of the product acid to precipitate the aluminum impurity as an aluminum fluorophosphate compound. The aluminum fluorophosphate can be decomposed (as by heating at about 195.degree. C.) to produce HF and aluminum phosphate.

REFERENCES:
patent: 3379501 (1968-04-01), Treitler et al.
patent: 3528771 (1970-09-01), Shearon et al.
patent: 3792151 (1974-02-01), Case
patent: 4299804 (1981-11-01), Parks
Gatilova et al., "Synthesis & Study of Aluminum Fluoride Phosphates," Jul. 1980, pp. 997-999.
White et al., New Zealand Journal of Science, "Calcination of Christmas Island Phosphates," Dec. 1971, vol. 14, pp. 971-992.
White et al., New Zealand Journal of Science, "Compounds Formed in the Manufacture of Superphosphates from the Phosphates of Christmas and Nauru Islands and Queensland", vol. 19, pp. 421-431.
Frazier et al., TVA, "Chemical Behavior of Fluorine in the Production of Wet-Process Phosphoric Acid," pp. 1-19.

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