ボール・ミル粉砕に関する研究 : 非表面積増加速度に対するビッカース硬度の影響

概要

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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 their effects on rate constant of specific surface increase. The samples used were silica glass, borosilicate glass, soda glass, quartz, feldspar, Iimestone, marble, 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 1180 g. The tests were done at the speed of 88.1% of critical one and with the feed size of -14+20 mesh. Assuming that the shape factor is six, the specific surface of fine particles was measured by the permeability method and that of coarse particles was calculated from the size distribution. As the result. the following equation was obtained. K_s=17H-_V^<-0.58>・W_s^<1.5> where K_s is the rate constant of specific surface increase of zero order kinetics, H-_V the dimension-less Vickers hardness and W_s the dimensionless feed weight. To obtain K_s from the first order rate constant of feed size decrease K_1, the following equation was derived. K_s = 20H-_V<-0.35> ( W_s/W_1)^<-1.5>・K_1 where W_1 is the dimensionless feed weight for the measurement of K_1.
社団法人日本材料学会の論文
1977-02-15