Process for producing low aluminum content phosphoric acid from

Details Process for producing low aluminum content phosphoric acid from Process for producing low aluminum content phosphoric acid from

1981-07-13

1983-03-22

Vertiz, O. R.

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

423166, 423320, C01B 2516

Patent

active

043775608

ABSTRACT:
A process for producing low aluminum content phosphoric acid from high aluminum matrix comprises digesting the matrix in phosphoric acid; adding a flocculant to consolidate gelatinous or fine undigested solids; separating the flocculated solids from the mother liquid comprising monocalcium phosphate; acidifying the monocalcium phosphate with sulfuric acid to precipitate solid calcium sulfate and simultaneously adding at least one sodium or potassium compound or both to co-precipitate some of the soluble fluoride with the gypsum; separating the product phosphoric acid from the precipitated solids; recycling part of the lower fluoride content phosphoric acid back to the digestion step; and, aging the remainder of the product phosphoric acid until a precipitate of aluminum fluorophosphate forms and separating the precipitate to produce a low aluminum content phosphoric acid. Additional fluorine (e.g., a fluoride compound) can be added to accellerate formation of the aluminum fluorophosphate.

REFERENCES:
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patent: 3792151 (1974-02-01), Case
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patent: 4299804 (1981-11-01), Parks et al.
Frazier et al., TVA, "Chemical Behavior of Fluorine in the Production of Wet-Process Phosphoric Acid," pp. 1-19.
Pechkovskii et al., "Synthesis and Study of Aluminum Fluoride Phosphates," Russian Journal of Inorganic Chemistry, vol. 25(7), 1980, pp. 997-999.
White, "Calcination of Christmas Island Phosphates," New Zealand Journal of Science, vol. 14, Dec. 1971, pp. 971-992.
White, "Compounds Formed in the Manufacture of Superphosphates From the Phosphates of Christmas and Nauru Islands and Queensland," New Zealand Journal of Science, vol. 19, 1976, pp. 421-431.

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