How to control the calcination process of Liaoning kaolin calcination process? Where is kaolin used?

How to control the calcination process of Liaoning kaolin calcination process? Where is kaolin used?

In the calcination process of Liaoning kaolin, the whiteness of kaolin products increases with the increase of calcination temperature, and the trend becomes slower. Compared with calcined kaolin products, metakaolin not only removes crystal water, but also increases pores, while maintaining flakiness. It belongs to medium temperature calcination, which reduces investment cost and environmental pollution, so it is selected as the best calcination temperature. The whiteness of the product increases with the extension of the constant temperature time, but the trend slows down. If the constant temperature time is too short, the carbon in the kaolin is not easy to remove, which reduces the whiteness. After the constant temperature time exceeds hours, the degree of decarburization and dehydroxylation of the product is small, so although the whiteness of the product is improved, the degree of improvement is small. In order to improve the heat utilization rate, the constant temperature time of calcined products should be controlled at hours. Liaoning kaolin calcination process uses different calcining aids, which can simplify the production process, reduce costs, and greatly improve the whiteness of calcined products. Among them, chloride is an effective additive. The introduction of urea as intercalating agent also improved the whiteness of calcined kaolin.

The calcination temperature control of Liaoning kaolin calcination process also has a great influence on the whiteness and yellowness of calcined products. Because the removal of carbon from coal series kaolin requires oxidation atmosphere calcination, and the low valent iron in it is oxidized to high valence, which will inevitably lead to the removal of carbon from kaolin and the corresponding increase of product yellowness. Therefore, after the calcination temperature is reached, the high valent iron is reduced to low valent iron by reducing atmosphere, and the whiteness of the product is improved and the yellowness is reduced by controlling the calcination atmosphere. The wet stirring mill is used for superfine processing of calcined kaolin, although the wet stirring mill can finely grind the calcined kaolin of coal measures to about M content. But the raw materials are difficult to grind, so the efficiency is low. But when grinding to the M content, the efficiency is higher. Therefore, the grinding classification process is adopted to make the content reach about 0.5%.

The calcined kaolin from Liaoning has high whiteness, softness, easy dispersion and suspension in water, good plasticity, high cohesion, excellent electrical insulation, good acid solubility, low cation exchange capacity, good fire resistance and other physical and chemical properties. Therefore, kaolin has become a mineral raw material for dozens of industries such as papermaking, ceramics, rubber, chemical industry, coating, medicine, national defense, etc.

Especially in recent years, with the rapid development of modern science and technology, kaolin has been widely used in some high-tech fields, and even the high-temperature ceramic parts of atomic reactors, space shuttles and spaceships are made of kaolin. Therefore, the calcination process of Liaoning kaolin is very important.