METHOD OF PRODUCNG ALUMINIUM OXIDE Russian patent published in 2017 - IPC C01F7/30 

FIELD: chemistry.

SUBSTANCE: aluminium nitrate Al(NO₃)₃⋅9H₂O or aluminium chloride AlCl₃⋅6H₂O is mixed with ammonium carbonate or with a mixture of ammonium carbonate and ammonium bicarbonate. The amount of ammonium hydrogen carbonate in the mixture does not exceed 50 moll. %. The mixing is carried out for 10-30 minutes to form a reaction mass containing ammonium hydroalumacarbonate. Ammonium carbonate or a mixture thereof with ammonium bicarbonate is taken in an amount of 100-130% by stoichiometry to form ammonium hydroalumocarbonate. The resulting reaction mass is subjected to a thermal treatment at a temperature of 300-600°C to produce aluminium oxide.

EFFECT: reducing the duration and energy intensity of the method, eliminating the formation of acidic sewage, which increases environmental friendliness.

2 cl, 6 ex