ボール・ミル粉砕の速度定数 : 供給粒度質量比の減少,比表面積増加速度定数に与える供給粒径の影響

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In the previous paper, the authors studied the effects of hardness of samples and feed weight on grinding rate constants from the kinetic point of view. In the present paper, we studied the effect of feed size on the rate constants of weight fraction decrease of feed and specific surface increase. The samples used were silica glass, borosilicate glass, soda glass, quartz, feldspar, Iimestone, gypsum and talc. The pebble mill consisted of a 12.8 cm-diameter by 13.2 cm-long cylinder and 40 balls of 3 cm diameter having the total weight of 1 180 g. The testes were done at the speed of 88.1% of critical one with several feed size ranges, 14〜20, 20〜28, 28〜35, 35〜48, 48〜65, 65〜100, 100〜150, 150〜200 mesh. With an assumption that the shape factor was six, the specific surface of fine particles was measured by the permeability method and that of coarse ones was calculated from the size distribution. As the result, the following equations were obtained. K_l = 0.02H_<v^^->^<-0.23gt;(W_s/W_B)^<-1.5> (x_f/x_0) K_S = 0.41H_<v^^->^<0.58>(W_S/W_B)^<-1.5>(x_f/x_0) Where K_1 is the first order decreasing rate constant of weight fraction of feed, H_<v^^-> the dimensionless Vickers hardness, W_S the feed weight, W_B the ball weight, x_f the feed size, x_0 the optimum feed size and K_S the zero order increasing rate constant of specific surface. To obtain K_S from K_1, the following equation was derived. K_S=20H_<v^^->^<-0.35>K_l
社団法人日本材料学会の論文
1978-07-15

ボール・ミル粉砕の速度定数 : 供給粒度質量比の減少,比表面積増加速度定数に与える供給粒径の影響

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