Kaolin has high refractoriness, commonly used to produce refractory materials, its products have high temperature resistance, and the ability to bear load at high temperature without deformation, kaolin stone as the main component, as well as bentonite and bauxite, according to its high temperature resistance, known as refractory clay. In China, the refractory greater than 1580℃ clay, refractory greater than 1770℃ bauxite, generally known as refractory clay, the former is divided into hard clay, soft clay, semi-soft clay, the latter called high alumina clay, some color China Kaolin Clay, can not be used for ceramics and papermaking, but it is a good raw material of refractory, so refractory material is an important market for the comprehensive application of kaolin.
There are two main types of refractory products for China Kaolin Clay: refractory brick, silicon aluminum cotton. The former is not less than 1730℃ refractoriness, 2×105Pa load softening starting temperature is not less than 1350℃, refiring line shrinkage rate is less than 0.5% (1400℃, 2h), according to the need to make a variety of sizes and shapes of firebrick, the latter is a kind of light refractory insulation material, its manufacturing method is using kaolin, after 1000-1100℃ roasting, Then the ore is melted by arc furnace at 2000℃ and blown into cotton under high speed air flow.
Kaolin can be used in the manufacture of refractory materials, such as firebrick, refractory enamel, etc. Because of its good fire resistance, it can be used to make firebricks to resist high temperature. Refractory enamel is a kind of corrosion-resistant refractory material, which can be used to make refractory pipe, refractory pot and refractory furnace. China Kaolin Clay can also be used to make refractory coatings, such as refractory coatings, refractory anticorrosive coatings and so on. It has the characteristics of non-toxicity, corrosion resistance and wear resistance, which can be used to protect the metal surface from corrosion and prolong the service life of the metal surface. Kaolin can also be used to make refractory insulating materials, such as refractory insulating fiber fabric, refractory insulating felt, etc. These refractory insulating materials have good fire resistance and insulation properties and can be used to protect the safe operation of electrical appliances.
However, the ratio of A1203 and Si02 content in China Kaolin Clay directly affects the change of refractorily. In high-quality kaolin, A1203/Si02 value is generally 0.7-0.8 or slightly higher, while in pure kaolin, A1203/Si02 ratio is 0.85. When the ratio is greater than 0.85, The presence of aluminium-rich minerals will improve the refractability, while the presence of quartz will reduce the refractability when the content of China Kaolin Clay is less than 0.7. In addition, the content of Fe203, TiO2, K2O in kaolin will reduce the refractoriness, with a certain degree of harm.
Kaolin is commonly used as a binder or filler material to enhance the strength and wear resistance of products. Kaolin is a white powdery substance obtained by processing kaolinite, which has excellent fire resistance and chemical stability. In refractory materials, kaolin is usually used as one of the important raw materials for the manufacture of refractory materials and ceramic products. China Kaolin Clay is a very important refractory material with excellent high temperature resistance, chemical stability and mechanical properties. It is widely used in many high temperature industrial fields.
