Method of producing fine particles

Details Method of producing fine particles Method of producing fine particles

B - Operations, Transporting

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C

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B02C 23/12 (2006.01) B02C 21/00 (2006.01) B02C 23/18 (2006.01) B02C 23/36 (2006.01)

Patent

CA 1323015

-17- ABSTRACT METHOD OF PRODUCING FINE PARTICLES This invention relates to a method of reducing the particle size of solid particles and is applicable to the production of very fine particles of a wide variety of solids, including relatively hard solids. The method comprises milling a liquid suspension of solid particles in an agitated media mill, pumping the milled suspension through a particle size classification device to separate the slurry into a coarse fraction and a fine fraction, the particles of the coarse fraction having a greater median particle size than the particles of the fine fraction, recycling the coarse fraction from the particle size classification device to the input of the mill, and recycling the fine fraction by pumping it to the classification device, wherein recycling of both coarse and fine fractions are continued until solid particles of the desired reduced particle size are produced. Preferably a single classification device and a single mill can be used, and particles having a median particle size of 0.3 microns or less and a relatively narrow particle size distribution can be produced, even using a hydrocyclone as the classification device.

571405

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