Application of Kaolin

Application of Kaolin

Compared with unfired kaolin, low-temperature calcined kaolin has a lower bound water content, an increase in silicon dioxide and alumina content, an increase in active sites, structural changes, small and uniform particle sizes. Compared with low-temperature calcined kaolin fillers, the vulcanization characteristic curve of NR Shaoer rubber is basically the same. The hardness remains unchanged, and the tensile strength increases. Both physical properties meet the requirements of the industry standard for sports shoe non-transparent sole.

In recent years, ceramics, rubber, plastics, Artificial leather, cement, refractory materials, chemicals and other industries and agriculture have not been widely used. With the further improvement of mineral processing technology, the application range of kaolin will become increasingly widespread. Each unit of the coal field geological system can start from the actual situation based on the resources and market demand of kaolin in the coal system strata. Kaolin is a common non-metallic mineral in nature. In the past, it was usually used to produce ceramics, refractory materials, and a small amount of mixed plastic and rubber as fillers. With the continuous development of various fields of the national economy, people are paying more and more attention to the deep processing of kaolin because it can not only obtain new materials with special properties, but also improve economic benefits. One of the methods for deep processing kaolin is to further heat, bake, and dehydrate it to become kaolin, which is used as a filler in the plastic cable department to improve the insulation performance of the cable sheath. Commonly used shoe rubber fillers and inorganic fillers. Kaolin is a new type of rubber filler developed in recent years, including titanium white magnesium, Magnesium carbonate, Magnesium carbonate, Magnesium carbonate.

But all applications of kaolin must be processed into fine powder before other materials can be added and fully integrated.

Ceramic Applications

The ceramic industry is the earliest and most widely used industry for the application of kaolin. The general dosage is 20% to 30% of the formula. The role of kaolin in ceramics is to introduce Al2O3, which is beneficial for the formation of mullite, improving its chemical stability and sintering strength. It decomposes to form mullite in kaolin, forming the main framework for the strength of the body, preventing product deformation, widening the sintering temperature, and giving the body a certain whiteness. At the same time, kaolin has a certain degree of plasticity, adhesiveness, suspension, and combination, which makes the ceramic mud and glaze have good formability, making the ceramic mud body beneficial for the billet and grouting, and easy to form. If used for wires, it can increase insulation and reduce dielectric loss.

Ceramics not only have strict requirements for the plasticity, combination, dry shrinkage, dry strength, sintering shrinkage, sintering properties, fire resistance, and post firing whiteness of kaolin, but also involve chemical properties, especially the presence of coloring elements such as iron, titanium, copper, chromium, and manganese, which reduce the post firing whiteness and produce spots.

The requirement for the particle size of kaolin is generally as fine as possible, so that the porcelain mud has good plasticity and drying strength. However, for casting processes that require rapid casting, accelerated grouting speed, and dehydration speed, it is necessary to increase the particle size of the components. In addition, the difference in crystallinity of kaolin can also significantly affect the process performance of porcelain billets. If the crystallinity is good, the plasticity and combination ability are low, the dry harvest is reduced, the sintering temperature is high, and the impurity content is also reduced; On the contrary, it has high plasticity, large dry shrinkage, low sintering temperature, and corresponding high impurity content.