Research in the area of obtaining of activated alumina. Part 5. Various technological approaches to the process of fine grinding of high-alumina raw materials

The results of studying the process of fine grinding of α-Al2O3 in the presence of polyethylene glycol (PEG) and an antistatic composition are presented. It is shown that the main reason for the agglomeration of fine particles is the effect of the appearance of an electrostatic surface charge. The introduction of PEG prevents the appearance of a «pseudo-viscous grinding medium», removing the excess electrostatic charge on the surface of newly formed ultrafine particles, and also intensifies the process of abrasion of primary alpha-alumina crystals. The antistatic composition successfully neutralizes the surface electrical charge, but does not have the effect of a grinding aid.