INFLUENCE OF THE TYPE AND SIZE OF GRINDING MEDIA ON THE PROPERTIES OF REACTIVE ALUMINA FOR REFRACTORY CONCRETE

Abstract

Refractory concrete products are used in various fields of production, such as metallurgy, ceramics, glass, cement and even nuclear industry. In any places where high temperature is used, a kind of "protector" is required from aggressive media, such as liquid, gas, solid materials. Just such a material is monolithic refractory, or simply refractory concrete. Such concrete, as well as ordinary construction, consists of various kinds of aggregates that have both high melting temper-atures and strong mechanical properties that give the final composite the necessary properties. This article presents the results of a study ofthe effect of the type and size of grinding media in a vibrat-ing mill on the properties of reactive alumina for refractory concrete. Studies have shown that the use of Ø12-18 balls as grinding media is the most optimal. Microscopic analysis showed that the shape and size of the grinding media affects the size and shape of the particles of reactive alumina. Since it allows you to reduce the grinding time from 30 min (workshop) to 20 min, which from an economic point of view reduces production costs by reducing energy costs and increasing the ser-vice life of the vibrating mill. Also, by increasing the specific surface area to 11838 cm2/g compared to the workshop (8500 cm2/g), it is possible to achieve better packing of particles in concrete. Thus, high indicators of reactive alumina were obtained, which will improve the construction and tech-nical properties of refractory concrete.