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박홍민,홍응기 전북대학교 공업기술연구소 1989 工學硏究 Vol.20 No.-
In order to examine whether or not we could apply the Hardgrove index to the Korean anthracite we measured the Hardgrove grindability index of coals whose samples were gathered from each colliery extensively. Each coal sample was grinded with Hardgrove grindability machine. The specific surface area of coal samples was calculated from equivalent number of surface area with paricle distribution. In addition, we also investigated relation between the grindability and fixed carbon contents, ash contests. The results are summarized as follows. ①The grindability index of coal samples was widely distributed with 46.33~248.48 larger than that(50~120) of general foreign ones. ②The formula of the Hardgrove grindability index, H.G.I is 6.93W+13. According to the formula of the grindability index obtained by the experiment, G.I is 6.98W+13.8. ③When the grindability index range from 50 to 220 the difference of the grindability index caculated with the formula obtained by the experiment and the formula of Hardgrove index is +1.26%~-0.18%. ④There is no correlation between the fixed carbon content, the ash content and the grindability index of total samples. But there is some correlation between the above and each coalfield and colliery.