INORGANIC PARTICULATE MATERIALS AND THEIR PRODUCTION

摘要

A method of producing a product inorganic particulate material which includes the steps of: (i) feeding to a particle size classifier a feed inorganic particulate material comprising kaolin which has a particle size distribution such that the percentage P by weight of particles having a size less than x mu m, where x mu m is repectively 2 mu m, 1 mu m, 0.5 mu m, and 0.25 mu m is as given in table 1; and (ii) separating the feed inorganic particulate material into a fine fraction and a coarse fraction, wherein at least the coarse fraction is extracted for use as a product inorganic particulate material.