Kaolin clay powder for building industry painting coating

Description

Kaolin powder, mainly composed of kaolinite with the chemical formula Al₂Si₂O₅(OH)₄, may contain trace amounts of quartz, feldspar, and other minerals. High - purity kaolin, free from excessive impurities, is highly sought - after for high - end applications.

Physically, its high whiteness, often exceeding 90% as measured by standard meters, makes it perfect for enhancing the brightness in paper and cosmetics. The particle size varies; ultra - fine particles (less than 2 microns) are used in advanced coatings and electronics, while coarser ones serve as industrial fillers. Its good plasticity when mixed with water is crucial for ceramic shaping, and a relatively low density of around 2.6 - 2.63 g/cm³ enables it to be a lightweight filler in composites.

Chemically, kaolin powder is stable under normal conditions, resistant to acids and alkalis. It also has a certain cation exchange capacity, useful in soil improvement and some chemical reactions.

In production, kaolin is mined from open - pit or underground mines. After mining, beneficiation processes like washing, magnetic separation, and flotation remove impurities. Then, it is ground to the desired size using methods such as ball milling and classified by cyclones or air - classifier systems. Finally, it is dried through spray - drying or rotary - drum drying and packaged.

Kaolin powder has diverse applications. In ceramics, it forms the base for porcelain, pottery, and tiles. In paper - making, it functions as a filler and coating pigment. In cosmetics, it absorbs oil in face masks and provides a smooth texture in powders. In plastics, it enhances mechanical properties. It also serves in paints, adhesives, rubber, and pharmaceuticals, playing various roles like pigment extension, viscosity adjustment.

Specification