Method of producing fine particles

Details Method of producing fine particles Method of producing fine particles

1990-12-03

1992-01-28

Rosenbaum, Mark

Solid material comminution or disintegration

Processes

With application of fluid or lubricant material

241 21, 241 24, 241 29, 241 80, B02C 1900

Patent

active

050837125

ABSTRACT:
A method of reducing the particle size of solid particles is applicable to the production of very fine particles of a wide variety of solids, including alumina hydrate, and 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 paricle size distribution can be produced, even using a hydrocyclone as the classification device.

REFERENCES:
patent: 4770352 (1988-09-01), Takamoto et al.
patent: 4989794 (1991-02-01), Askew et al.

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