Anhydrous kaolin clay pigment and method of preparation
Kaolin calciner waste heat and feed recovery system and method Patent #: 4717559
ApplicationNo. 479793 filed on 02/14/1990
US Classes:106/416, Clay containing or derived therefrom106/485, Special process of pelletizing or agglomerating or product106/486, Clay or material derived therefrom containing162/181.6, Silicon containing additive other than clay162/181.8, Clay501/144, Kaolin (e.g., ball clay, fire clay, etc.) containing501/145Clay pretreatment
ExaminersPrimary: Group, Karl
International ClassC04B 014/10
AbstractA low-abrasion calcined kaolin opacifying pigment composed of particles in the size range of about 70 to 84% by weight finer than 2 microns and having a color defined by Hunter Trisitimulus values of "L" within the range of 92 to 94, "a" within the range of + 1.0 to + 2.2 and "b" within the range of +6.4 to + 7.5. The pigment is produced by novel wet processing including high solids degritting of a high iron, high titania content Tertiary kaolin without conventional fractionation, bleaching and dewatering to isolate a fine particle size fraction, followed by spray drying, pulverization, calcination and repulverization.