Preparation of crystalline cryolite

Details Preparation of crystalline cryolite Preparation of crystalline cryolite

1979-07-11

1980-10-07

Hearn, Brian E.

Chemistry of inorganic compounds

Halogen or compound thereof

Plural metal or metal and ammonium containing

C01F 750

Patent

active

042268427

ABSTRACT:
An improved process for the preparation of crystalline cryolite having a molar ratio Na:Al of 2.9:1 to 3.0:1, by reacting aqueous solutions of aluminum fluoride with at least a stoichiometric amount of sodium fluoride in aqueous solution, while heating, in the presence of cryolite seed crystals, wherein the sodium fluoride is used in an amount of 3.2 to 3.5 moles of sodium per mole of aluminum, the aluminum fluoride concentration being from 15 to 250 g./l., the sodium fluoride concentration being from 30 to 42 g./l., the reaction temperature being from 85.degree. to 100.degree. C., the reaction time from 0.5 to 3 hours and the pH value in the reaction mixture from 5 to 8, to provide an end product having an adsorbed water content of 8% or less.

REFERENCES:
patent: 2492650 (1949-12-01), McLean
patent: 3825659 (1974-07-01), Harrison et al.

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