Kaolin is also called porcelain clay and pottery clay. The difference in the degree of crystallization of kaolinite in kaolin will also significantly affect the process performance of the porcelain blank. If the degree of crystallization is good, the plasticity and bonding ability will be low, the drying shrinkage will be small, the sintering temperature will be high, and the impurity content will be reduced. Kaolin has certain plasticity, cohesiveness, suspension, and binding ability, which endows porcelain clay and enamel with good formability, which makes ceramic slime beneficial to car blanks and grouting, and is easy to form.
Specific uses of kaolin
1. The special properties of kaolin, such as plasticity, cohesiveness, certain drying strength, sinterability, and whiteness after firing, make it the main raw material for ceramic production, which is used in the production of daily-use ceramics, architectural and sanitary ceramics, electric porcelain, chemical industry Corrosion-resistant ceramics, arts and crafts ceramics and special ceramics, etc.
2. Refractory Kaolin Clay Powder excellent technological properties such as whiteness, softness, high dispersibility, adsorption, and chemical randomness make it widely used in the paper industry. Fillers and coatings for the paper to improve the density, whiteness, and smoothness of the paper, improve printing performance and reduce papermaking costs.
3. Pure kaolin with refractoriness higher than or equal to 1770℃ can be used to make crucibles and laboratory crucibles for smelting optical glass and glass fiber. White cement, etc.
4. Used as a reinforcing agent and filler, it can improve the mechanical strength and acid resistance of rubber, improve product performance and reduce cost.
5. To make high-efficiency adsorbents, instead of synthetic chemical molecular sieves, used as petroleum cracking catalysts.
6. As a filler for adsorption layer, additives, bleaching agents, detergents, cosmetics, pencils, pigments, and paints.
7. It is used as the carrier of chemical fertilizers and pesticides.
8. Kaolin with low iron content is used in the glass fiber manufacturing industry. Its main function is to provide a source of aluminum and silicon and to dull its luster.
9. The decorative plate made of glass-ceramic with kaolin as the main raw material and wollastonite as the main crystal phase adopts the melting crystallization molding process. The method has low cost, ideal product color, pattern, and appearance effect, and the surface of the product has colorful tone patterns on the basis of natural stone patterns.
10. Kaolin is transformed into metakaolin with high pozzolanic activity after dehydration. The soil aggregate cement prepared by the alkali activation of metakaolin and directly used as a concrete mineral admixture can significantly improve the workability, strength, and durability of concrete, and also have a good effect on the self-shrinking phenomenon commonly found in high-performance concrete. inhibitory effect.

Industrial use; the role of kaolin in ceramics is to introduce Al2O3, which is conducive to the formation of mullite, improves its chemical stability and sintering strength, and decomposes kaolin to form mullite during sintering, forming the main framework of green body strength, which can be It can prevent the deformation of the product, widen the firing temperature, and make the green body have a certain degree of whiteness. Ceramics not only have strict requirements on the plasticity, bonding, drying shrinkage, sintering properties, refractoriness, and whiteness after burning of kaolin, but also involve chemical properties, the existence of iron, titanium, copper, chromium, manganese, and other color elements, The whiteness after burning is reduced, so spots are generated.