METHOD FOR PRODUCING FINELY DISPERSED ACTIVATED ALPHA-ALUMINUM OXIDE Russian patent published in 2022 - IPC C01F7/23 B22F9/04 B82Y30/00 

FIELD: chemistry.

SUBSTANCE: invention relates to the field of chemical technology, namely to methods for producing finely dispersed activated alpha-aluminum oxide (α-Al₂O₃), which is used as a highly dispersed component in the production of technical and special corundum ceramics, and as a component of matrix systems in the technology of low-cement refractory injection molding masses. The method includes dry grinding of raw materials, as which calcined alumina is used, in which the content of a phase α-Al₂O₃ is at least 98%, and a median particle size D50 is in the range from 40 to 60 mcm, in a ball mill using cylindrical grinding bodies with a volume of 6.3 cm³ each and volumetric loading of a reel with grinding bodies of 35 %. Before the start of grinding, polyethylene glycol is added in the amount of 0.05% of the weight of raw materials above calcined alumina, and polycarboxylate ether is simultaneously added in the amount of 0.085-0.68% of the weight of raw materials.

EFFECT: alpha-aluminum oxide is obtained with a submicron fraction content from 22.2 to 25.7%, with the minimum viscosity and high fluidity of suspensions based on it at minimum operating humidity, as well as reduction in grinding time.

1 cl, 2 dwg, 3 tbl, 4 ex