What are the characteristics of kaolin

What are the characteristics of kaolin

Suspensibility

Suspension and dispersion refer to the function of kaolin that is difficult to deposit in water due to its dispersion. Also known as anti flocculation. Generally, the finer the particle size, the better the suspension. Kaolin used in the enamel industry requires outstanding suspension properties. The suspension function of a sample dispersed in water is generally determined by its settling rate at a certain time.

Selectability

Selectability refers to the function of manually selecting, mechanically processing, and chemically treating kaolin minerals to remove harmful impurities and achieve industrial quality requirements. The selectivity of kaolin depends on the mineral composition, occurrence state, particle size, etc. of harmful impurities. Quartz, feldspar, mica, iron, titanium deposits, etc. are all harmful impurities. Kaolin beneficiation mainly includes projects such as sand removal, iron removal, and sulfur removal.

The calcination temperature of Kaolinite is low and its activity is high. When calcined at high temperature, it can form aluminum spinel and produce mullite at a certain temperature. At the moment, the activity of kaolin is very low, which cannot meet the production demand for organic polymer products

Kaolin has excellent calcination function and is widely used in industrial production such as papermaking, plastics, coatings, and rubber. In the papermaking industry, kaolin is used as a filler and coating material. As a plasticizer of titanium dioxide in coatings, it reduces cost and improves the viscosity and stability of coatings. It is suitable for the plastic industry to improve surface smoothness, reduce hot cracks, facilitate polishing and chemical corrosion. As a rubber filler, it can reduce cost and enhance rubber

Therefore, in actual production and use, it is necessary to select kaolin with different calcination temperatures and modify the appearance based on different process parameters. For example, modified kaolin cables require low-temperature calcination, which has excellent surface activity and excellent use effect. For the filling agent of insulated cables, high-temperature calcination of kaolin is required, which has high chemical stability and electrical insulation, which helps to improve electrical resistivity. The calcination temperature of modified kaolin is high, Mainly used as a substitute for pigments, but not too high. The hydroxyl groups after calcination, or after chemical surface modification and grinding, are often used as filler reinforcement fillers. Kaolin is filled with rubber and plastic, and has excellent reinforcement effects. It can also be used as functional coating additives to optimize the coating function