Aluminium Fluoride is produced by reacting wet (3-7% H2O) Aluminium Hydroxide with the Hydrofluoric Acid gas in a one bed expanded fluid bed reactor. Aluminium Fluoride produced in this process will achieve higher purity, lower content of impurity, especially the SiO2 only 0.02-0.05%, P2O5 0.007%, which will provide better performance in the application of primary Aluminium smelting.