METHOD OF PRODUCTION OF HYDROXOCHLORIDE OF ALUMINIUM Russian patent published in 2000 - IPC

FIELD: production of hydroxochloride of aluminium. SUBSTANCE: non-desilified or desilicified aluminate solutions formed in processing bauxites by sintering are mixed with slag or flushing water till solution at concentration of 15 to 30 g/l of Al₂O₃ is obtained and reducing temperature to 20-25 C followed by carbonization of mixed solutions by flue gases at content of CO₂ of 5 to 7%, filtration of hydrate pulp and dissolving of amorphous aluminum hydroxide in hydrochloric acid. Aluminate solutions are mixed with slag or flushing water at ratio of 1:4 - 6. Carbonization of mixed solutions is performed at flue gas pressure not exceeding 0.68 kg/sq.cm for 1 to 1.5 hours. Filtration is performed in vacuum of 0.6 to 0.75 kg/sq, cm at supply of water at temperature of 15 to 25 C. Dissolving of amorphous aluminium hydroxide is effected in 25- to 35% hydrochloric acid at temperature of 90 to 95 C maintaining pH of medium of 2 to 4.5 during 2 to 4 hours. EFFECT: improved quality of product; low cost. 5 cl, 1 tbl