Chemical beneficiation of phosphatic limestone and phosphate roc

Details Chemical beneficiation of phosphatic limestone and phosphate roc Chemical beneficiation of phosphatic limestone and phosphate roc

1979-06-18

1980-12-09

Vertiz, O. R.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Alkaline earth metal

423173, C01F 1148

Patent

active

042384591

ABSTRACT:
A method of selectively extracting calcite and dolomite away from apatite in phosphate rock or phosphatic limestone wherein the phosphate rock or phosphatic limestone is treated with a mixture of sulfur dioxide, water, and a carbonyl compound. Solids are separated from the liquid phase. The solids consist principally of apatite admixed with clay, quartz, and other accessory minerals originally in the rock. The solids are heated to drive off adhering sulfur dioxide, water, and carbonyl. The liquid phase consists of carbonyl, water, sulfur dioxide, and magnesium and calcium ions. Heating this liquid preferentially precipitates CaSO.sub.3.1/2H.sub.2 O. This solid is filtered off and the filtrate further heated to precipitate MgSO.sub.3.3H.sub.2 O largely free of CaSO.sub.3.1/2H.sub.2 O. All off gas and filtrate is returned to the process.

REFERENCES:
patent: 4113842 (1978-09-01), McCullough et al.

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