China Clay Powder
Description
China clay, also known as kaolin, is a white, commercially valuable clay primarily composed of the mineral kaolinite. It’s characterized by its fine particle size and whiteness, making it useful in various industries. Its properties like brightness, glossiness, abrasiveness, and viscosity also influence its applications. China clay is used in paper manufacturing, paints, rubber, and cosmetics, among other industries.
Typical Properties
Composition: Primarily kaolinite (Al2Si2O5(OH)4).
Appearance: White to off-white, fine powder.
Particle Size: Small, with a smooth, non-gelatinous feel.
Low Plasticity: Does not readily deform under pressure.
Low Shrinkage and Swelling: Minimizes cracking and distortion.
Chemical Inertness: Resists chemical reactions and degradation.
High Refractoriness: Withstands high temperatures.
Good Dispersion: Easily mixes into other materials.
Oil Absorption: Can absorb significant amounts of oil.
pH: 10% aqueous solution has a pH of 7-8.
Water Soluble Salts: Max 1.0%.
Volatile Matter: Max 10%.
Loss on Ignition: 13-15%.
Specific Gravity: 2.5-2.7.
Chemical Composition of Calcite
China clay, also known as kaolin, is primarily composed of the mineral kaolinite, which has the chemical formula Al₂Si₂O₅(OH)₄. This can also be expressed as Al₂O₃·2SiO₂·2H₂O. In addition to kaolinite, raw china clay often contains other minerals like quartz, feldspar, and mica
Applications
Paper Industry. The china clay powder has one of the most important applications in the paper industry. …
Ceramics. China clay is an important ceramic product, used particularly in the manufacture of porcelain and fine china. …
Paints and Coatings. …
Rubber Industry. …
Pharmaceuticals.