Process for producing phosphoric acid from low purity phosphate

Details Process for producing phosphoric acid from low purity phosphate Process for producing phosphoric acid from low purity phosphate

1987-03-16

1988-05-10

Doll, John

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

423167, 423319, C01B 2516

Patent

active

047434384

ABSTRACT:
An improved process for extending the capabilities of an existing, conventional wet-process phosphoric acid production plant to more effectively utilize phosphate values contained in low purity phosphate rock which process comprises (1) adjustment of the maximum soluble sulfate level in phosphoric acid taken from, for example, the conventional wet-process acid facility prior to reacting same with such low purity phosphate rock, in combination therewith, and (2) control of the parameters of (a) ratio of attack acid to feed rock, (b) reaction temperature, and (c) reaction time. Said improved process effects selective dissolution of calcium and phosphate values from such rock without incurring unwanted and undesired high codissolution of congeneric aluminum and iron impurities therein. After separation from the undissolved impurity-containing gangue, the resulting solution of calcium phosphate in phosphoric acid is returned to a conventional wet-process facility for subsequent treatment with sulfuric acid to produce phosphoric acid and calcium sulfate, while the gangue is washed to recover additional phosphate values, and the wash liquor is transported to a conventional facility where it is used to wash the calcium sulfate filter cake.

REFERENCES:
patent: 4435370 (1984-03-01), Holcomb et al.

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