high alumina brick

Ceramic industry kiln

  • Monday, 29 June 2020
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At present, the kilns used in building sanitary ceramics and related industries are roughly: tunnel kilns, rail kilns, shuttle kilns, push plate kilns, clinker kilns, etc. Individual industries also involve rotary kilns, bell kilns, electric kilns, etc.

The kiln is the most critical thermal equipment of the ceramic enterprise and the equipment with the most energy consumption, but the level of kiln energy consumption depends mainly on the structure and firing technology of the kiln. The structure of the kiln is fundamental. If there is no good design, it is very difficult to improve the firing technology to a certain extent, or even helpless; on the contrary, with a good kiln structure, there is also a need for more The advanced firing technology as a guarantee is interdependent and indispensable; only the reasonable cooperation of the above two can ensure the improvement of firing quality of the new kiln and reduce energy consumption.

Reasonable selection of refractory materials for kiln

The main performance of the kiln is mainly determined by the technical and economic performance of refractory insulation materials, which directly affects the investment cost, working performance, thermal efficiency, and energy consumption of the kiln. General principles for choosing refractory insulation materials:

① Kiln performance and thermal characteristics.

②Safe use temperature of material, heat conduction system, high temperature strength, chemical stability.

③Use life.

④Investment cost and operation maintenance cost.

In general, heavy refractory materials focus on a certain technical performance index, such as high temperature stability, chemical stability, etc.; light-weight insulation materials pay more attention to the comprehensive technical and economic indicators of investment and operation.

The refractory materials used in building sanitary ceramic kilns include the wall and ceiling of the kiln. They are generally divided into three layers: the inner layer is light insulation cotton, felt, board, etc., the middle layer is heavy or light insulation brick, and the outer layer is Mainly red brick or low temperature insulation brick. The inner light-weight insulation layer has developed rapidly in recent years, mainly low-temperature mullite fiber, taking into account high-temperature mullite fiber, high-aluminum mullite fiber, zirconium-containing mullite fiber, etc., the temperature from 12000C~ Various systems of 16000C. In the process of making fiber, wire drawing, spinning, blowing and other processes are used. The inner layer is also made of lightweight bricks or slabs such as lightweight mullite and high-alumina, with hollow alumina bricks such as lightweight alumina and mullite as the main body. The heavy materials in the middle layer are still mainly made of low aluminum and high silicon, high aluminum and low silicon, mullite and cordierite, coke and mullite. The low-temperature refractory material of the outer layer is mainly made of bauxite, coke, clay, etc. The relative aluminum content is relatively low, the temperature resistance is poor but the price is low.

 The refractory materials used in building sanitary ceramic kilns include the wall and ceiling of the kiln. They are generally divided into three layers: the inner layer is light insulation cotton, felt, board, etc., the middle layer is heavy or light insulation brick, and the outer layer is Mainly red brick or low temperature insulation brick. The inner light-weight insulation layer has developed rapidly in recent years, mainly low-temperature mullite fiber, taking into account high-temperature mullite fiber, high-aluminum mullite fiber, zirconium-containing mullite fiber, etc., the temperature from 1200C~ Various systems of 1600C. In the process of making fiber, wire drawing, spinning, blowing and other processes are used. The inner layer is also made of lightweight bricks or slabs such as lightweight mullite and high-alumina, with hollow alumina bricks such as lightweight alumina and mullite as the main body. The heavy materials in the middle layer are still mainly made of low aluminum and high silicon, high aluminum and low silicon, mullite and cordierite, coke and mullite. The low-temperature refractory material of the outer layer is mainly made of bauxite, coke, clay, etc. The relative aluminum content is relatively low, the temperature resistance is poor but the price is low.

 The refractory materials for kiln car include kiln car surface, kiln car bracket, bearing plate, casket, etc. In addition to the basic structural surface materials that make up the kiln car, the rest of the materials are collectively called kiln furniture materials. The refractory materials for the kiln car and the wall material of the kiln are basically the same. Kiln furniture materials include mullite, high-aluminum mullite, cordierite, mullite-cordierite, SiC, oxide-bonded silicon carbide, silicon nitride-bonded silicon carbide, etc.

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