The need for ultra fine particles has been increasing in the preparation field of raw powders such as fine ceramics and high functional products. A series of wet grinding experiments were carried out on inorganic powders such as calcite, pyrophyllite and talc by a stirred ball mill. The grinding rate constant K’ in the equation of grinding kinetics was examined based on the grinding kinetics analysis as the same type of function of a previous paper on a vertical type planetary ball mill. The experimental particle size distribution of the ground products was obtained in various grinding conditions. The grinding rate constants K and K' were expressed by empirical equation involving experimental conditions by a stirred ball mill. The empirical equation on the grinding rate constant was expressed in terms of a function involving the ball diameter of grinding balls, the median diameter of feed material, and Bond’s work index of material, in the experimental conditions. The values of empirical constants C1 and C2 were 21.13 and 0.0109 on K, while C1 and C2 were 120.99 and 0.0192 on K', respectively. And the particle size distribution of ground products of each test material for a given grinding time was found to be expressing the selection function (the specific rate of breakage) which was obtained from the grinding kinetics analysis. In this study, the grinding rate change on calcite and pyrophyllite was similar at the same experimental operation condition. However, in the case of talc, it was observed that the grinding_x000D_ rate was not increased compared with other samples.

Ultra Fine Grinding Stirred Ball Mill Grinding Kinetics Selection Function Grinding Rate Constant

Jimbo G, J. of Chem. Eng. of Jpn., 25, 117 (1992)
Choi WS, J. of Soc. Powd. Technol. in Jpn., 33, 747 (1996)
Choi WS, Chung HY, Yoon BR, Kim SS, Powder Technol., 115(3), 209 (2001)
Gao M, Forssberg E, Powd. Technol., 84, 107 (1995)
Zheng J, Harris CC, Somasundaran P, Powd. Technol., 86, 191 (1996)
Kwade A, Powder Technol., 105(1-3), 382 (1999)
Bernhardt C, Reinsch E, Husemann K, Powder Technol., 105(1-3), 357 (1999)
Reid KJ, Chem. Eng. Sci., 20, 953 (1965)
Berthiaux H, Dodds J, Powder Technol., 94(2), 173 (1997)
Park JK, Jeong Y, Yang JI, Jung MY, Korean J. Chem. Eng., 15(4), 375 (1998)
Kim S, Choi WS, Korean J. Chem. Eng., 25(3), 585 (2008)
Deshpande SB, Potdar HS, Patil MM, Deshpande VV, Khollam YB, J. Ind. Eng. Chem., 12(4), 584 (2006)
Kano J, Saito F, Powder Technol., 98(2), 166 (1998)
Belaroui K, Pons MN, Vivier H, Meijer M, Powder Technol., 105(1-3), 396 (1999)
Choi HK, Hwang JY, Kim SS, J. of the Miner. Soc. of Kor., 20, 135 (2007)
Nakajima Y, Tanaka T, IEC Proc. Des. Dve., 12, 23 (1973)
Tanaka T, Introduction to powder processing, 2nd Ed., Kogaku Tosha Kabushiki Kaisha, 182-193, Japan (1985)
Tanaka T, KONA, 13, 19 (1995)
Prasher CL, Crushing and grinding proc. handbook, John Wiley & Sons, 81-84, New York (1987)