Kaolin, a non-metallic mineral, is a type of clay and clay rock mainly composed of kaolinite group clay minerals. Due to its white and delicate appearance, it is also known as Baiyun soil. The main components are aluminum trioxide and silicon dioxide

Its pure kaolin is white, delicate, and soft in texture, with good physical and chemical properties such as plasticity and fire resistance. Its mineral composition is mainly composed of kaolinite, halloysite, hydromica, illite, montmorillonite, as well as minerals such as quartz and feldspar.

Process characteristics:

1. Whiteness Brightness – Whiteness is one of the main parameters for the processing performance of kaolin, and high-purity kaolin is white. The whiteness of kaolin is divided into natural whiteness and calcined whiteness. For ceramic raw materials, the whiteness after calcination is more important, and the higher the calcined whiteness, the better the quality

2. Particle size distribution – Particle size distribution refers to the proportion (expressed in percentage content) of particles in natural kaolin within a given range of continuous different particle sizes (expressed in millimeters or micrometer mesh). Each industrial department has specific requirements for the particle size and fineness of kaolin for different purposes. The United States requires kaolin used as a coating to have a content of less than 2 μ m (6250 mesh), accounting for 90-95%, and paper-making fillers with a content of less than 2 μ m account for 78-80%. For casting processes that require fast casting, accelerated grouting speed, and dehydration speed, it is necessary to increase the particle size of the ingredients.

3. Suspension: Suspension and dispersion refer to the properties of kaolin that are difficult to precipitate when dispersed in water. Also known as anti flocculation. The smaller the particle size, the better the suspension. Kaolin used in the enamel industry requires good suspension properties. The suspension performance of a sample dispersed in water is generally determined by its settling rate over a certain period of time.

4. Electrical insulation: High quality kaolin has good electrical insulation properties, which can be used to make high-frequency ceramics and wireless ceramics. The level of electrical insulation performance can be measured by its ability to withstand electrical breakdown.

Classification:

Water washed kaolin calcined kaolin metakaolin

Usage:

Kaolin has a wide range of uses, mainly used in papermaking, ceramics, and refractory materials, followed by coatings, rubber fillers, enamel glazes, and white cement raw materials. In small amounts, it is used in industrial sectors such as plastics, paints, pigments, grinding wheels, pencils, daily cosmetics, soap, textiles, petroleum, chemical, building materials, etc