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Kotake N.,Yamagata University | Matsumoto K.,Yamagata University | Sekine Y.,Nippon Coke and Engineering Company | Gunji S.,Nippon Coke and Engineering Company | Kezuka H.,Nippon Coke and Engineering Company
International Journal of the Society of Material Engineering for Resources | Year: 2014

This study examined the fine grinding of limestone using a bead mill and a circular stirred media mill. Fine grinding characteristics of the bead mill using poly-sized grinding media with a volume mean diameter of 0.5 mm were compared with those observed by mono-sized grinding media with the same mean diameter. The median diameter of the ground particles and the mass of milled products below 1? m can be expressed as functions of the number of rotor revolutions, the mass of the grinding media, and/or the mass of the sample; these relationships were observed for both the poly-sized and mono-sized grinding media. This study showed that the median diameter of particles milled with poly-sized grinding media was more than 10% smaller than that obtained with mono-sized grinding media, and the mass of milled particles below 1? m produced with the poly-sized media was more than 10% greater than that milled using mono-sized media. The use of the poly-sized grinding media in the bead mill led to improvement in productivity of fine particles of limestone. © 2014 Soc. Mater. Eng. Resour. Japan. Source


Kotake N.,Yamagata University | Endo K.,Yamagata University | Sato I.,Yamagata University | Gunjic S.,Nippon Coke and Engineering Company | And 2 more authors.
International Journal of the Society of Material Engineering for Resources | Year: 2010

This study presents results from a study of fine grinding in limestone conducted using a super centrifugal mill (SC-mill), a type of circular stirred mill. The effects of the operational conditions in the SCmill such as rotor speed, grinding time, the mass of the grinding media, and the mass of the feed sample on the fine grindability of limestone were investigated for 0.5 and 0.8 mm grinding media. The results suggest that the mass and the specific surface area of the fine particles produced by the SC-mill could be expressed as functions of the operational conditions mentioned above for the respective grinding media size. Source

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