Preparation of dicalcium phosphate from phosphate rock by the us

Details Preparation of dicalcium phosphate from phosphate rock by the us Preparation of dicalcium phosphate from phosphate rock by the us

1977-03-18

1978-09-12

Vertiz, O. R.

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

423311, 423167, 71 33, C01B 1516, C01B 2526, C01F 100

Patent

active

041138422

ABSTRACT:
A method of preparing dicalcium phosphate from phosphate rock wherein the rock is treated with a mixture of water, carbonyl, and sulfur dioxide. Solids are separated from the liquid phase. The solid phase consists of a mixture of gangue, and calcium .alpha.-hydroxysulfonate. Carbonyl and part of the sulfur dioxide are recovered from the solid by low temperature thermal decomposition. Dicalcium phosphate is precipitated from the liquid phase by partial distilling of SO.sub.2. All carbonyl is recovered for recycle.

REFERENCES:
patent: 1137806 (1915-05-01), Stewart
patent: 1251741 (1918-01-01), Blumonberg
patent: 1981145 (1934-11-01), Keller
Wilson, The Industrial Potential of SO.sub.2 -Carbonyl Compound--Water Mixture, Proceedings of the Can Sulfur Symposium, 1974.

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