ボール・ミル粉砕について : 湿式・乾式粉砕の比較

概要

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To investigate ball mill grinding from the kinetic point of view, the effects of hardness of samples, feed weight and feed size on the grinding rate constant of weight fraction decrease of feed have been studied. The samples used were silica glass, borosilicate glass, quartz, feldspar, Iimestone, marble and talc. The pebble mill consisted of a 12.8 cm-diameter by 13.2 cm-long cylinder and the grinding medium was 40 balls of 3 cm diameter having the total weight of 1 180 g. In the case of wet grin-ding, 400 cc-water was added to the mill. The test were done at the speed of 88.1% of critical one. The experiments were performed on 10 different particle sizes from 4 to 100 mesh for dry grinding and on 8 different ones from 8 to 100 mesh for wet grinding to obtain the grinding rate constants. The following results were obtained. Dry ; K_1=0.02H_<v^^->^<-0.23>・(W_s/W_B)^<-1.5>・(x_f/x_0) Wet ; K_l=0.06H_<v^^->^<-0.23>・(W_s/W_B)^<-1>・(x_f/x_0)^<0.7> 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 and x_0 the optimum feed size.
社団法人日本材料学会の論文
1978-07-15