METHOD FOR SEPARATING SOLID PHASE OF ALUMINUM HYDROXIDE SUSPENSION Russian patent published in 2003 - IPC

FIELD: alumina production. SUBSTANCE: solid phase of aluminum hydroxide suspension is separated into two fractions on sizing screen, which process involves loading starting material, gravitational fluidized-bed size separation in, withdrawal of coarse and fine fractions from bottom and top sections, respectively, and feeding treatment fluid into lower part of fluidized bed. Concentration of solid phase in fluidized bed suspension in the region located above thickened product zone is maintained within the limits between 500 and 900 kg/cu.m and this concentration is controlled by varying value of treatment fluid consumption and varying amount of coarse-fraction particles withdrawn from sizing screen. EFFECT: enhanced aluminum hydroxide classification efficiency. 2 cl, 3 dwg