| 摘要 |
FIELD: chemistry. ^ SUBSTANCE: in order to obtain aluminium oxide applicable for manufacturing artificial corundum crystals, aluminium of 99.95-99.999% purity is dissolved in solution of chlorides of ammonium, sodium or their mixture, which contains 5-150 g/l of chloride-ions, at temperature 20-95C with reverse supply of constant current at current density 0.045-0.12 A/cm2. Electrode surface is washed with rate 60-1400 l/(m2h) with electrolyte, circulating in outer contour. Formation of dense aluminium hydroxide sediment is performed in collection expansion tank with expansion coefficient 25-400. Aluminium hydroxide is separated from electrolyte by centrifugation with rotation rate 20-60 rev/s. Sediment is washed in specially prepared water with specific resistance 0.4-18 megaohmcm. Washed sediment is dried in flow of hot air with temperature 100-400C and annealed in electric furnace until aluminium oxide is obtained. ^ EFFECT: invention makes it possible to increase product output and electrolyser productivity, improve quality of obtained aluminium oxide. ^ 7 cl, 1 tbl |
