Yuan Lei's Little Knowledge | Eight Application Fields and Functional Characteristics of Kaolin
Kaolin is an important non-metallic mineral resources, mainly composed of small flaky, tubular and laminated kaolinite cluster minerals less than 2 microns (kaolinite, dikonite, perlite, halloysite, etc.), widely used in ceramics, paper, coatings, rubber, plastics, catalysts, adhesives, agricultural carriers and other fields.
Kaolin is used in paper, which can increase the brightness and gloss of paper, and improve the ink acceptance and smoothness of fiber paper. Kaolin can also be used as a substitute for pulp.
2. Paint and coating
Kaolin has high chemical stability, high hiding power, high whiteness, good dispersion and suspension properties, which makes it occupy a large market share in the paint and coating industry. At the same time, the specific surface area of the calcined kaolin will increase accordingly, and the absorption capacity of the ink will increase. In addition, the calcined kaolin is more resistant to scrubbing than the uncalcined kaolin, and the effect of the application in the exterior paint is better.
Kaolin is used in the rubber industry as a filler and reinforcing agent for rubber, which can improve the quality of rubber products. After kaolin powder is mixed with rubber, it can greatly improve the physical and chemical properties of rubber products, and improve the corrosion resistance, wear resistance and stability of rubber products. In addition, kaolin is rich in resources and low in price, which can significantly reduce the cost of rubber products.
Kaolin is mainly used as a filler in the plastics industry. Since the calcined kaolin has a large adsorption area and activity, its application in plastics can adsorb the conductive ions in the plastics, thereby improving the performance of the plastics, making the plastics more smooth, beautiful, and resistant to chemical corrosion.
5. Wire and cable
Kaolin is also used in insulating electronic materials. Organic polymer materials account for a large proportion of insulating electronic materials. Because organic flame retardants are very harmful to the environment, inorganic flame retardants are gradually replacing traditional organic flame retardants. Modified calcined kaolin has high insulation resistance, so it is widely used in insulating electronic materials. Because it also has the ability to resist seawater erosion, kaolin can also be used in the manufacture of submarine cables, so that the insulation performance of the cable is greatly improved.
6, Ceramics and Refractories
Clay is an essential raw material in ceramic products, accounting for 25-100% of the ceramic body. However, kaolin is only one of the many clays used in the industry. The use rate of kaolin accounts for an average of 25% of pottery, 60% of porcelain, 20-30% of ceramic sanitary ware, and 20% of electric porcelain and wall tiles. Refractory uses include the lining of flat furnaces and blast furnaces in the steel industry, as well as cement and ceramic films.
7. Environmental protection materials
New environmentally friendly materials are also one of the applications of kaolin, which can be used as synthetic molecular sieves and polymeric aluminum chloride. The use of kaolin to produce polyaluminium chloride can improve the quality of the corresponding products, but also reduce the production cost, environmental pollution is small, economic and social benefits are better.
8, Building Materials
Kaolin is also widely used in cement-based materials. Metakaolin, which is prepared by calcining kaolin at appropriate temperature and ultra-fine crushing, is considered to be a new generation of cement concrete admixture. They have obvious improvement and reduction effects on the workability, strength and durability of cement-based materials, and they also have self-shrinkage and shedding phenomena that are common in high-performance cement-based materials.Better inhibition.
Properties, Kaolin, Calcined, Rubber, Medium, Application, Cement, Ceramics, Plastics, Insulation
Kaolin is a non-metallic mineral, which is a kind of clay and clay rock mainly composed of kaolinite clay minerals. Because it is white and delicate, also known as white earth. It is named after Gaoling Village, Jingdezhen, Jiangxi Province.
Barium sulfate is based on barite as the main raw material, through beneficiation, ore washing, crushing and other processes. Barium sulfate has a hardness of 3~3.5 (Mohs) and a specific gravity of 4.3~4.7. It has the characteristics of high specific gravity, low hardness and brittleness. Barite is almost insoluble in water, ethanol and acid, soluble in hot concentrated sulfuric acid. With the development of some high-performance barium sulfate products, the application field of barium sulfate is constantly expanding.