In the industrial industry, there are many choices for kilns in various industries, and the classification of refractory materials is also very important, so what are they divided into? Generally speaking, it is mainly divided into four types: refractories for glass tank kilns, refractories for cement kilns, castables for ceramic kilns, and refractories for coke ovens. For specific details, please continue to look down:
Refractory materials for glass tank kiln
According to the working environment of the glass tank kiln, various factors that lead to the damage of the kiln lining are comprehensively considered: chemical erosion, mechanical erosion, temperature fluctuations and high temperature effects, etc. The selection of kiln materials mainly includes the following series:
1.Al2O3-SiO2 series; mainly include clay bricks and silica bricks.
4. MgO-Al2O3, MgO-Cr2O3, MgO-Sioz series;
5.Thermal insulation material
Refractories for cement kilns
Refractory materials for cement kilns are multi-variety materials and should be used in a comprehensive manner. There are mainly the following categories:
1.Alkaline refractories; the main varieties of alkaline refractories are: magnesia chrome bricks, magnesia bricks, spinel bricks, dolomite bricks, etc. Magnesia-chrome bricks are divided into ordinary magnesia-chrome bricks, direct-bonded magnesia-chrome bricks, and semi-direct-bonded magnesia-chrome bricks.
2.Aluminum-silicon refractories; aluminum-silicon refractories for cement kilns, in addition to ordinary clay bricks and high-alumina bricks, have their special requirements. Mainly wear-resistant, alkali-resistant, and temperature-resistant. For this reason, a series of special high alumina bricks have been developed, such as phosphate bonded high alumina bricks, phosphate bonded high alumina wear-resistant bricks, anti-stripping high alumina bricks and resistant Alkali and semi-acid clay bricks, etc.
3.Thermal insulation refractory materials; mainly including silicic acid cover plates and lightweight thermal insulation bricks.
4. Pouring material. Castables for cement kilns include high-strength and high-alkali castables, anti-skinning castables, low-cement refractory castables, special castables for kiln mouths, castables for coal injection pipes, special castables for tertiary air ducts, and wear-resistant castables.
Castable for ceramic kiln
The inner wall material of the kiln wall is required to be resistant to high temperature, and the type of refractory material selected is determined by the baking temperature of the product.
1.Use clay refractory bricks at temperatures below 1300℃;
2.Use high alumina bricks at 1300-1400℃;
3.Use silica brick at 1400-1500℃;
4.Use magnesia alumina bricks at 1500—1600℃;
5.Use corundum bricks below 1800°C.
Refractories for coke ovens
1.Refractory materials used in the carbonization chamber; clay bricks were mostly used in the past, but now they tend to use high-quality high-alumina bricks, sillimanite bricks and andalusite bricks for masonry.
2.Refractory materials for combustion chamber. The combustion chamber and the carbonization chamber share the furnace wall, and the bricks used are the same as the carbonization chamber.
3.Refractory materials for furnace roof. Due to the large temperature fluctuation around the coal loading hole on the furnace roof, it is built with clay bricks, and the other parts are built with silica bricks.
4.Refractory materials used for ramps. The chute connects the combustion chamber and the regenerator, requiring a stable brick structure and resistance to thermal stress. Clay refractory bricks are used for small coke ovens, and silica bricks are used for masonry of large and medium-sized coke ovens.
5.Refractory materials for regenerators. The single vertical wall, partition wall, bottom and checker brick masonry of the small coke oven regenerator are all built with clay bricks. The middle and upper masonry of the large and medium coke oven regenerators are all built with silica bricks to make the coke oven The whole is expanded evenly.
6.Refractory materials for small flues. The small flue is located at the bottom of the regenerator and communicates with the flue. All small flues are lined with clay bricks.