What Is a Vitrified Clay Pipe?
Ceramic clay is a general term for clays suitable for use as ceramic raw materials. It is mainly composed of kaolin.
- Ceramic clay, also commonly known as kaolin or kaolinite clay. It is a clay specifically used for firing ceramics.
- The mineral composition is mainly kaolinite.
- Its characteristics are generally high adhesion, plasticity and good sintering performance. It can be sintered at 1360 ° C. The sintering temperature and refractory interval are large, no scars and spots after firing. FeO, Fe2O3 in chemical composition , TiO2 and other harmful impurities content is very small. It is the main raw material for manufacturing various industrial technical ceramics, building sanitary ceramics and daily-use ceramics.
- Kaolin is white, and when it contains impurities, it can be off-white, gray, yellow-yellow, yellow-brown, gray-green, and gray-black. Soil-like or compact, with hardness between 1 ~ 2.5. It has obvious slippery feel when touched by hand, density is 2.2 ~ 2.6 g / cm³, and it feels sticky when licked with tongue when dry. It has strong water absorption, but does not swell. After crushing into powder and mixing with water, it has plasticity, insulation and high fire resistance. Its chemical properties are relatively stable and its acid resistance is also good.
- The main chemical composition of kaolin is Fe 2 O 3 , TiO 2 , CaO, MgO, K 2 O, and Na 2 O in the amounts of Al 2 O 3 , SiO 2 , and H 2 O, but the composition of different origin varies greatly.
- Chemical composition is an important factor in evaluating the quality of kaolin. The higher the Al2O3 content, the higher the fire resistance, and the better the product's firmness. A large amount of impurities will seriously affect the quality of kaolin.
- The general industrial requirements are shown in the following table:
- In addition to kaolin, which is mainly used in the ceramics industry, the paper industry will also be the largest user of kaolin, and it will also be used in industrial sectors such as rubber, plastics, and refractories. Since the 1980s, in the advanced industrial field, kaolin has also begun to be used as an important component of high temperature resistant composite materials to make infrared and far-infrared radiation ceramic components and high-temperature ceramic plates for space shuttle shells. In ancient medicine, kaolin was known as baishizhi, Xingping, jaundice, diarrhea, and qi and soreness [1]
- It is mainly distributed in the southeast coastal areas, but also in southern Sichuan, northern Guizhou, western Kunming, and central Hubei. Weathered kaolin deposits are the main type of deposits, followed by sedimentary types. Hydrothermal kaolin deposits in China are smaller in scale, and the kaolin deposits in Jingdezhen, a well-known porcelain capital of China, belong to weathered residual deposits [2] .