METHOD OF PRODUCING CRYOLITE

摘要

FIELD: chemistry. ^ SUBSTANCE: cryolite is obtained by mixing aluminium oxide, sodium chloride and ammonium hydrodifluoride or fluoride in stoichiometric ratio, taken in excess of up to 20% of the stoichiometric ratio. The obtained mixture is heated at the first stage to 240C and kept at this temperature until complete separation of ammonia gas and water, and at the second stage - to 400C and kept until complete subliminal removal of ammonium chloride. ^ EFFECT: invention allows for obtaining cryolite and ammonium chloride at the same time. ^ 2 ex