The pure kaolin is white, delicate and Mollisol like, with good plasticity, fire resistance and other physical and chemical properties. Its mineral composition is mainly composed of Kaolinite, halloysite, hydromica, Illite, Montmorillonite, quartz, feldspar and other minerals. Kaolin is widely used in papermaking, ceramics, and refractory materials, followed by coatings, rubber fillers, enamel glazes, and white cement raw materials. A small amount is used in plastic, paint, pigments, grinding wheels, pencils, daily cosmetics, soap, pesticides, pharmaceuticals, textiles, petroleum, chemical, building materials, national defense, and other industrial sectors.

Physical and chemical properties of kaolin

Physical and chemical properties: It is mostly matte, with a pure and delicate appearance. If it contains impurities, it can have colors such as gray, yellow, and brown. The appearance can appear as loose soil blocks or dense rock blocks depending on the origin. Density 2.54-2.60 g/cm3. The melting point is about 1785 ℃. It has plasticity, and wet soil can be molded into various shapes without breaking, and can remain unchanged for a long time.

Genetic type of kaolin Ore genesis

On the basis of the cause of formation of kaolin deposits, according to the differences in metallogenic geology, geographical conditions, deposit scale, ore body shape and occurrence characteristics, ore material composition and other aspects reflected by different mineralization, China's kaolin deposits are divided into three types and six subtypes in the Geological Exploration Specifications for Kaolin Mines.

1. Weathering type: also divided into weathering residual subtype and weathering leaching subtype;

2. Hydrothermal alteration type: further divided into hydrothermal alteration subtypes and modern hydrothermal alteration subtypes;

3. Sedimentary type: it can be divided into sedimentary and sedimentary weathering subtypes and Kaolinite clay rock subtypes in coal bearing strata.

Industrial types of kaolin ore

According to its texture, plasticity, and mass fraction of sand, it can be divided into three types:

1. Hard kaolin: It is hard and has no plasticity, but has plasticity after being crushed and finely ground.

2. Soft kaolin: It is soft and has strong plasticity, with a sand mass fraction of<50%;

3. Sandy kaolin: It is soft and has weak plasticity, with a sand mass fraction of>50%.