Process for the production of aluminum hydroxide of improved whiteness

摘要: Aluminium hydroxide of high whiteness is produced by (i) heating aluminium obtained from the Bayer process to a temperature 300 700° C. (ii) dissolving soluble fraction thus activated product at 85 275° in aqueous sodium form aluminate liquor containing an undissolved residue very fine boehmite, (iii) filtering said obtain clear solution supersaturated with respect dissolved alumina, (iv) cooling 50 80° and seeding crystallized induce further crystallization, (v) separating, washing drying crystals.