Mini-Encyclopedia of Papermaking Wet-End Chemistry Additives and Ingredients, their Composition, Functions, Strategies for Use. CLAY. Composition: This discussion will be limited to kaolin, the most common form of clay added to paper as a filler.(Bentonite, a generic term for montmorillonite clay, is a microparticle, and it is described elsewhere in this mini-encyclopedia.)Kaolin Clay Mask Benefits for Clearer, Brighter Skin,Kaolin, also known as white clay or china clay, is a soft clay that’s been used in China for centuries to create porcelain products. It’s also used widely in skin care products, toothpastes,Washed kaolin production process - News - Foshan Powtech,,Oct 16, 2019· The kaolin purification process can be washed, calcined, magnetically selected, and the like. Washed kaolin production process. Washed kaolin is produced by coarsening, slurring, sieving, grinding, centrifuging, grading, chemical and possibly magnetic treatment, concentration and drying of coarse clay to achieve the desired purity, particle size and brightness.