Process for the treatment of a calcium aluminophosphate

Details Process for the treatment of a calcium aluminophosphate Process for the treatment of a calcium aluminophosphate

1980-08-05

1982-03-23

Vertiz, O. R.

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

423167, 423522, 423132, 423150, C01B 2516

Patent

active

043212441

ABSTRACT:
A process for treating a rock essentially constituted by calcium aluminophosphate, comprising the treatment of the ground rock with a concentrated sulfuric acid in stoichiometric excess with respect to calcium and aluminum, at a temperature of above about 120.degree. C., for a time between a few minutes and about 5 hours, followed by controlled water take-up. Subsequently, a residue containing substantially all the calcium and the aluminum of the rock and a solution of the acids serving to digest a tricalciumphosphate charge are separated. The process is particularly suitable for the treatment of Thies phosphate ore.

REFERENCES:
patent: 2504544 (1950-04-01), Legal
patent: 3124419 (1964-03-01), Germain et al.
patent: 3161467 (1964-12-01), Hignett et al.
patent: 3420628 (1969-01-01), Robinson
patent: 3562769 (1971-02-01), Sugahara et al.
Bridges et al., Producing Acid from Low Grade Phosphatic Materials, CEP, Nov. 1978, pp. 62-65.
Legal et al., Phosphoric Acid by the Clinker Process, I&EC, Mar. 1957, pp. 334-337.

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