Method of production of synthetic fluorite having a selected gra

Details Method of production of synthetic fluorite having a selected gra Method of production of synthetic fluorite having a selected gra

1976-10-21

1978-06-06

Stern, Edward

Chemistry of inorganic compounds

Halogen or compound thereof

Binary fluorine containing compound

423420, 423421, 423335, C01F 1122

Patent

active

040937062

ABSTRACT:
Method of production of synthetic fluorite with a selected specified grain size to be obtained, by submitting the calcium carbonate to a reaction with fluoride ions present in an aqueous solution, consists therein that calcium carbonate is used having a grain size substantially the same as the selected grain size for the synthetic fluorite to be obtained. The fluoride ions for the reaction with the calcium carbonate are supplied in the form of a solution of ammonium fluoride and/or potassium fluoride and/or sodium fluoride. The process is conducted at a temperature chosen within the range of 50.degree. C to 150.degree. C, under a pressure reduced, atmospheric or elevated, within the range of 0.5 to 10 atm, and preferably at the boiling temperature or at a temperature not too far from the boiling point, especially in a reaction system containing ammonium fluoride. The process is conducted by mixing the calcium carbonate grains with a solution containing fluoride ions, or by passing the solution containing the fluoride ions through a bed of grains containing the calcium carbonate. In both cases it is preferable to conduct the process by counter-current displacement of the reaction agents.

REFERENCES:
patent: 2573704 (1951-11-01), Gilbert et al.
patent: 3357788 (1967-12-01), Ross

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