Washed kaolin

Washed kaolin natural kaolin ore output, according to its quality, plasticity and sandy (quartz, feldspar, mica and other mineral particle size> 50 microns) content, can be divided into coal (hard) kaolin, a soft kaolin and sandy clay of three types: 1, hard kaolin (kaolinite Shiyan): hard (hardness 3-4), no plasticity, crushing, grinding after having plasticity. 2, soft kaolin (kaolinite earthy): soft, strong plasticity in general, sandy content. 3, sandy clay: quality soft, weak general plasticity of the sand after a strong, sandy content of> 50%. By cause classification by geological origin kaolin into two types: 1, native kaolinite: is after weathering of rocks and rock without the forces of nature and the residual carrying kaolin together. Kaolin produced in southern China mainly belong to this type. 2, deposited kaolinite: refers to transport and deposited by the forces of nature, while the transport and deposition process has various impurities mixed with clay. Kaolin northern China mostly belong to this category. [2] Kaolin - Kaolin forming the Earth millions of years ago the ancient rivers and lakes sedimentary rocks above the ground after orogeny, and after the original earth movement, after completely weathered to form kaolinite, quartz and soluble salts; re with the rain, river rafting and deposited at the turn to it again, this time separating quartz and soluble salts Pat, you can get kaolin, which K2O, Na2O water-soluble ingredients, most taken away by the water. The wind is not complete, the stone will form part of a long muscovite, there are some rock deep underground and could not due to weathering, still feldspar form. Some sedimentary kaolin in the formation process will be deposited simultaneously with certain impurities. [2] Kaolin - Kaolin clay composition consists of less than 2 microns small sheet, tube, fold or flake kaolinite cluster minerals (kaolinite, dickite, pearl stone, halloysite, etc.), with ideal The formula Al2O3-2SiO2-2H2O, the main mineral component is kaolinite and halloysite, kaolinite cluster minerals in addition, there are montmorillonite, illite, pyrophyllite, quartz and feldspar and other minerals associated . The chemical composition of kaolin contains large amounts of Al2O3, SiO2 and a small amount of Fe2O3, TiO2, and trace amounts of K2O, Na2O, CaO and MgO, etc. Theoretically, kaolinite chemical composition should be: silicon dioxide (SiO2) 46.5%, aluminum oxide (Al2O3) 39.5%, water (H2O) 14%. [3] Kaolin - the nature of the physical attributes of appearance: pure kaolin appearance of white or light gray. When containing impurities yellow, gray, green and other colors of roses. Ore dense block or loose earthy, soft, creamy feel, hardness of less than nails. Specific Gravity: 2.4-2.6. There are sucked dry lubrication. Refractoriness: high, up to 1770-1790 ℃. Plasticity, insulation and chemical stability: medium and low plasticity. It has good insulation properties and chemical stability. Calcined whiteness: high, up to 60% -90% range. Technological characteristics measure kaolin technical characteristics of indicators are: the whiteness and brightness; particle size distribution; plasticity; binding; viscosity and thixotropy; drying performance; sintering properties; firing shrinkage; fire resistance; suspension and dispersion; optional ; adsorption and ion exchange properties; chemical stability; electrical insulation. Depending on the process as a basis for characteristic values ??can produce different kinds of products. Kaolin - use porcelain ceramic kaolin mainly under the surface, which can directly affect the different texture and composition of the pottery and porcelain in the kiln changes, it can produce high quality kaolin outstanding artifacts, but more often in the periphery build kilns, Jingdezhen in Jiangxi Province as China, Fujian Province, Kinmen County. Development and use of kaolin, Jingdezhen Porcelain for the rapid development has laid a solid foundation for the development of the world's ceramic technology played a major role in the revolution. With the first single porcelain material into the porcelain (using porcelain stone as a raw material to make porcelain) and later binary formulations (using two materials porcelain stone and clay to make porcelain), porcelain technology is increasingly outstanding. As kaolin porcelain raw materials, greatly promoted the improvement of the level of ceramic technology and product quality, and promote the development of ceramics. Other kaolin is also widely used in paper, rubber, chemicals, paints, pharmaceuticals and defense industries and dozens of mineral raw materials necessary. Kaolin is also used in place of steel manufacturing aspects of cutting tools, lathes, drills and internal combustion engines, such as Shell. The rapid development of modern science and technology, making applications more widely kaolin, some of the high-tech field began to make extensive use of kaolin as a new material, even atomic reactors, high temperature porcelain space shuttle and spacecraft parts, also made of kaolin.