METHOD OF PRODUCING ALUMINIUM FLUORIDE Russian patent published in 2011 - IPC C01F7/50 

FIELD: chemistry.

SUBSTANCE: invention relates to inorganic chemistry and can be used to produce aluminium fluoride. Aluminium hydroxide is mixed with an excess of up 20% ammonium fluoride or hydrofluoride. The mixture is heated to 126-238°C and then kept at that temperature until complete separation of ammonia gas and water vapour to obtain ammonium cryolite. The ammonium cryolite undergoes thermal decomposition at temperature higher than 350°C until complete separation of ammonia gas and hydrogen fluoride to obtain aluminium fluoride.

EFFECT: invention enables to carry out an anhydrous continuous process in a single chemical apparatus - a tubular revolving furnace with two heating zones.

2 dwg