What is a first-grade high alumina brick?

First-grade high alumina brick is a common refractory material, widely used in various high temperature industrial fields. Due to its excellent high temperature resistance, corrosion resistance and mechanical strength, it has become an ideal choice for high temperature kilns, metallurgical industry, steel industry, glass melting furnaces and other applications.

Standards for first-grade high alumina brick

The main component of first-grade high alumina bricks is alumina (Al2O3), the content of which is usually above 75%, and it has good refractory, wear resistance, and corrosion resistance. High alumina bricks are divided into primary, secondary, and tertiary high alumina bricks. The main difference between them is the different alumina content, which leads to differences in their refractoriness, load-softening temperature, apparent porosity, and bulk density. The performance of primary aluminum bricks is superior to other

Physical properties

The physical properties of first-grade high alumina bricks include bulk density, compressive strength, refractoriness, thermal expansion coefficient, and thermal conductivity. Generally speaking, the bulk density of first-grade high alumina bricks is between 2.5-2.7g/cm³, the compressive strength is between 70-100MPa, the refractoriness is above 1750℃, the thermal expansion coefficient is below 0.6×10^-6/℃, and the thermal conductivity is between 1.5-2.5W/(m·K).

Chemical properties of first-grade high-alumina brick

The chemical properties of first-grade high-alumina bricks are crucial for their application in different industries. Generally speaking, the chemical composition of first-grade high-alumina bricks should be as pure as possible, without a large number of impurity elements such as alkali metals, iron, calcium, etc., so as to avoid reaction, sintering or melting at high temperatures. In addition, the acid and alkali corrosion resistance of first-grade high-alumina bricks is also one of its important chemical performance indicators.

Uses of high alumina bricks

High alumina refractory bricks are mainly used for lining blast furnaces, hot blast furnaces, electric furnace tops, blast furnaces, reverberatory furnaces, and rotary kiln linings. For the selection of high alumina bricks, you only need to choose the most suitable type, so that the price of high alumina bricks is appropriate because the price of first-grade high alumina bricks is higher than other high alumina bricks.

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