Preparation method of alumina milling balls

Abstract

The invention discloses a preparation method of an alumina milling balll. The preparation method comprises the following steps: 1) sieving aluminum oxide powder with the purity of more than or equal to 99.995%, the particle size D50 value of 0.6-1.0 [mu]m and the specific surface area of less than or equal to 8 m<2> / g to obtain sieved aluminum oxide powder; 2) collecting the sieved alumina powder,adding pure water accounting for 5-20% of the weight of the sieved alumina powder, and preparing ball seeds in a ball forming machine, when the particle size of the ball seeds reaches 0.1-0.3 mm, adding sieved aluminum oxide powder on the ball seeds in the ball forming machine to start to grow balls, when the ball diameter is increased to 0.5-0.6 mm, adjusting the rolling moving track of the ball, and adding sieved alumina powder to continuously grow the ball, when the ball diameter is increased to 0.7-0.8 mm, adjusting the rolling moving track of the ball, and adding sieved aluminum oxide powder to grow the ball continuosuly, when the ball diameter is increased to 0.8-0.9 mm and the apparent density of the alumina ball after ball repairing and pressing reaches 1.5 g / cm<3> or above, drying and sintering the balls at 1300-1400 DEG C for 15-25 hours to obtain the alumina milling ball. The alumina milling ball has the characteristics of high purity, low abrasion, high strength and smoothand round surface.

Description

technical field [0001] The invention belongs to the technical field of grinding, in particular, the invention relates to a method for preparing high-purity alumina ceramic grinding balls with high grinding efficiency, high purity and low wear. Background technique [0002] At present, the domestic production of alumina grinding ceramic balls includes isostatic pressing method, combustion titration method, rolling agglomeration method and so on. The purity of additives added by the isostatic pressing method is low; the production cost of the combustion titration method is high, which is not conducive to market competition; the rolling agglomeration method is used to prepare alumina ceramic grinding balls, in order to increase the density, hardness, and sintering activity of the balls. The raw materials of aluminum balls are added with various additives, and then calcined at high temperature in the later stage to form alumina ceramic grinding balls, but the purity of the produ...

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Problems solved by technology

The purity of additives added by the isostatic pressing method is low; the production cost of the combustion titration method is high, which is not conducive to market competition; the rolling agglomeration method is used to prepare alumina ceramic grinding balls, in order to increase the density and hardness of the balls, and increase the sintering activity. The raw materials of aluminum balls are added with various additives, and after high-temperature calcination in the later stage, they are made into alumina ceramic grinding balls, but the purity of the product and the instability of wear are affected by the addition of additives.

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