Alumina refractory brick, that is, an aluminum silicate refractory material with an alumina content of more than 48%. It is formed and calcined from bauxite or other raw materials with high alumina content. High thermal stability, refractoriness above 1770℃. Good slag resistance. High alumina brick is the most widely used aluminum refractory brick, that is, an aluminum silicate refractory material with an alumina content of more than 48%. It is formed and calcined from bauxite or other raw materials with high alumina content. High thermal stability, refractoriness above 1770℃. Good slag resistance.
High alumina bricks are the most widely used type of refractory bricks. Therefore, the price of high alumina bricks directly affects the production cost of enterprises.
1. The influence of aluminum content on the price of high alumina bricks
One of the important working properties of high alumina refractory bricks is the structural strength at high temperature, which is usually evaluated by the softening deformation temperature under load. Its high temperature creep property was also measured to reflect its high temperature structural strength. The test results show that the softening temperature under load increases with the increase of Al2O3 content. High-alumina brick manufacturers are divided into three grades according to the Al2O3 content of Al2O3: Grade I-Al2O3 content>75%; Grade II-Al2O3 content is 60-75%; Grade III-Al2O3 content is 48-60%, generally That said, the three grades divide lightweight brick into three price ladders.
The alumina content of high-alumina bricks is more than 48% and belongs to neutral refractory brick manufacturers. It is formed and calcined from bauxite or other raw materials with high alumina content. High thermal stability, the temperature of refractory brick manufacturers is above 1770 ℃. It has good slag resistance and is used for the lining of steelmaking electric furnaces, glass melting furnaces, cement rotary furnaces, etc. This product has the advantages of small creep at high temperature, strong corrosion resistance and good thermal shock stability, and is suitable for large and medium-sized hot blast stoves.
The production process of high-alumina bricks and multi-clinker clay bricks is similar. The difference is that the proportion of clinker in the ingredients is higher, which can be as high as 90-95%. Higher, such as I, II and other high-alumina bricks are generally 1500 ~ 1600 ℃ when fired in a tunnel kiln.
Second, the performance of high-alumina bricks is an important factor affecting the price of high-alumina bricks
1. Refractoriness
The refractoriness of high-alumina bricks is higher than that of clay bricks and semi-silica bricks, reaching 1750~1790℃, which belongs to high-grade refractory materials.
2. Load softening temperature
Because of the high Al2O3 in high alumina products, less impurities and less fusible glass body, the softening temperature under load is higher than that of clay bricks, but because mullite crystals do not form a network structure, the softening temperature under load is still lower than that of silica bricks.
3. Slag resistance
There are more Al2O3 in high alumina bricks, which are close to neutral refractory materials, and can resist the erosion of acid slag and alkaline slag. Because it contains SiO2, the ability to resist alkaline slag is weaker than that of acid slag.
High alumina bricks are mainly used for the lining of blast furnaces, hot blast stoves, electric furnace tops, blast furnaces, reverberatory furnaces and rotary kilns. In addition, high alumina bricks are also widely used as open hearth regenerative checker bricks, plugs for pouring systems, nozzle bricks, etc. However, the price of high-alumina bricks is higher than that of clay bricks, so it is not necessary to use high-alumina bricks where clay bricks can meet the requirements.
3. The influence of size on the price of high alumina bricks
The size of high alumina bricks is generally divided into national standard, special type and special type. The size of the national standard is fixed, and the production enterprises can produce in large quantities, so the price is relatively low; while the size and shape of special-shaped and special-shaped bricks are not fixed. Except for general special-shaped bricks, customized production is generally required, which requires the cost of mold opening and production. The difficulty also increases according to the complexity of the shape, so the price is relatively high.
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