Patent ID: 6312511
Filing Date: 2001-11-06
Classification: B03C,C01P,C04B,C09C,D21H

Abstract:
A method of making a high brightness kaolin clay comprising:a. applying magnetic separation to a blunged, degritted kaolin clay crude having a particle size distribution as follows: 50%-70% less than 2 microns, 20%-35% less than 0.5 microns and 5%-20% less than 0.3 microns, all e.s.d. as determined by Sedigraph for a period of time sufficient to achieve the brightness;b. fractionating the clay to retain a first fraction that is 90% less than two microns in particle size, separately from a second fraction of the remaining clay, wherein the retained 90% less than two micron fraction comprises the high brightness kaolin clay.