METHOD FOR PROCESSING ALUMINIUM-CONTAINING RAW MATERIAL Russian patent published in 2015 - IPC C22B21/00 

FIELD: chemistry.

SUBSTANCE: method includes burning aluminium-containing raw material, processing burnt material with hydrochloric acid, separation of obtained pulp into clarified chloride solution and Si-stoff, washed with water before sending in dump, desalting aluminium chloride by saturation of clarified chloride solution with gaseous hydrogen chloride, calcination of aluminium chloride to obtain aluminium oxide and pyrohydrolysis of mother liquor with return of hydrogen chloride to stages of acid processing and desalting, aluminium chloride hexahydrate, precipitated in process of desalting, is processed with water ammonia, obtained sediment is directed to calcination, solution of ammonium chloride is mixed with aluminium-containing raw material before its burning or in the process of burning, separated in the process of burning ammonia is dissolved in water, obtained water ammonia is supplied for processing of aluminium chloride hexahydrate, and burnt material before acid processing is subjected to water leaching with ratio of liquid and solid phases equal 0.6-1.4.

EFFECT: increased alumina quality and reduction of energy consumption.

4 cl, 1 tbl, 1 dwg