Lightweight high-alumina refractory bricks have good thermal insulation, good thermal insulation effect, and high refractoriness. The use temperature is related to the index, and can be exposed to flame. According to the index, it can be used for a long time at a high temperature within 1300-1350-1380°C.
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Product description:
Lightweight high-alumina refractory bricks contain more than 48% alumina and are mainly composed of mullite and glass phase or corundum. Bulk density 0.4~1.35g/cm3. The porosity is 66%~73%, and the compressive strength is 1~8MPa. Thermal shock resistance is good.
Performance characteristics:
Lightweight high-alumina refractory bricks have the advantages of high porosity, low bulk density, good thermal insulation effect, high mechanical strength, low thermal conductivity and long service life. It is suitable for various industrial kilns and is a basic refractory material with energy saving and heat preservation.
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Precautions
In daily life, there are many high-alumina light-weight thermal insulation refractory bricks for coke ovens and furnace linings, and most of them are used to build the inner lining and thermal insulation layer of kilns, as well as parts without strong high-temperature molten material erosion and scouring. . It is worth noting that when it is in direct contact with the flame, according to the indicators of each product, the safe use temperature cannot be exceeded.
Production method of high-alumina lightweight refractory brick:
The specific preparation steps include:
(1) According to the raw material calculation of the above-mentioned percentage of mass stars, the prefabricated mud is prepared by mixing and grinding the large particles of high alumina clinker, calcium aluminate fine powder, kaolin superfine powder, pore-forming agent and pulp water; Add AL2O3 micropowder, silicon micropowder and fine silica aerogel to the prefabricated mud, and mix and grind to obtain the mixed mud;
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(2) The mixed-rolled mud material is pressed into bricks by a press, and the bricks are naturally dried for 24 hours, then placed in a drying kiln, and dried at a temperature of 200 ° C for 24 hours; then the dried The brick body is calcined at a temperature of 1350° C. for 10 hours, thereby obtaining the microporous high-alumina light-weight refractory brick.
What is the use temperature of lightweight high alumina refractory bricks?
According to the reference physical and chemical indicators, the AL2O3 content of 50% is used below 1300°C, the AL2O3 content of 52% is used below 1350°C, and the AL2O3 content of 56% is used below 1380°C.
Zhengzhou Shennan Refractory CO.,Ltd are professional in producing lightweight high alumina bricks , any demands,please don't hesitate contact with me.
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+86-15238007351 |
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+86-371-86039318 |
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annie@snrefractory.com |
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www.snrefractory.com |
