Does anyone know what are the refractory materials with high alumina?

The main raw materials are bauxite, corundum, clay, and other high-alumina refractories Definition of Al2O3 content greater than 48% Aluminum silicate refractories are collectively referred to as high-alumina refractories. According to the amount of Al2O3 content, it is divided into three grades: etc.:

W(Al2O3)>75% etc.: W(Al2O3)=60% 75% etc.:W(Al2O3)=48% 60% According to the mineral composition, it is divided into:

Low mullite and mullite (w(Al2O3)=48% mullite-corundum and corundum-mullite (w(Al2O3)=corundum (w(Al2O3)=95% 100%) (Note: corundum refers to refractory products with corundum as the main crystalline phase, and different literatures have different limits on Al2O3 content, and some literature points out that corundum products refer to high-alumina products with Al2O3 greater than 90%)). In the range where W(Al2O3) is less than, with the increase of W(Al2O3) content, the main crystal phase mullite in high-alumina products increases. In the range where W(Al2O3) is greater than, the amount of mullite decreases and the amount of corundum increases with the increase of Al2O3 content.

The fire resistance of the product increases with the increase of Al2O3 content. Compared with clay refractories, the outstanding advantages of high-alumina refractories are high refractory and load softening temperature, and with the increase of Al2O3 content, the slag resistance is significantly improved. (1) Refractoriness.

The refractory of high-alumina refractory has a wide fluctuation range, generally 1770 2000, which is mainly affected by the Al2O3 content, and increases with the increase of Al2O3 content in the product. At the same time, the refractory is also affected by the content and type of impurities, which is related to the mineral structure of the product. (2) Load softening temperature.

The load of high-alumina refractory products begins to deform when the load is softened, and the temperature is greater than 1400; and increased with the increase of Al2O3 content. (3) Thermal conductivity. High-alumina refractory products have a higher thermal conductivity than clay-based products.

The reason is that there are fewer glass phases with low thermal conductivity in high-alumina products, while the amount of mullite and corundum crystals with better thermal conductivity increases, which improves the thermal conductivity of the products. (4) Thermal shock resistance. The thermal shock resistance of high-alumina refractory products is between clay and siliceous products.

The 850 water cooling cycle is only 3 to 5 times. This is mainly due to the fact that the thermal expansion of corundum is higher than that of mullite, and there is no crystalline transformation. (5) Slag resistance.

High-alumina refractory products are resistant to both acidic slag and alkaline slag. However, the resistance to alkaline slag is not as good as that of magnesia materials, but it is better than that of clay materials, and increases with the increase of mullite and corundum content. The main mineral composition of high-alumina bricks is mullite, corundum and glass facies.

With the increase of Al2O3 content in the product, the number of mullite and corundum phases also increases, the glass phase decreases accordingly, and the refractory and high temperature performance of the product are improved accordingly (2) Modified high-alumina bricks include high-load soft high-alumina bricks, micro-expansion high-alumina bricks, low-creep high-alumina bricks, and phosphate-bonded high-alumina bricks. Hehe: That's a lot.

The raw materials of high-alumina refractories mainly include high-alumina bauxite and synthetic mullite, and high-alumina, referred to as high-alumina, the main minerals are composed of diaspore and high-alumina silica. Mullite has the characteristics of good high temperature volume stability, high thermal strength, strong creep resistance and good thermal shock resistance, and is used to make various high-grade and medium-grade refractory materials. Reference to the thunder method refractories.

It seems that there are high alumina bauxite and mullite, I don't remember.

Common refractory raw materials are silica, silica fume, pyrophyllite, pyrophyllite, synthetic mullite, fused corundum, brown corundum, high-alumina corundum, white corundum, dense corundum, sintered corundum, sintered magnesia, fused magnesia, chromite, magnesia-chromium spinel, magnesia spinel, fused magnesia spinel, iron-aluminum spinel, etc., different types of refractories use different raw materials, you can go to the thunder refractory to see, thank you.

Among the sintered refractories with the main chemical composition of Al2O3-SiO2, the aluminum silicate refractories with an Al2O3 content greater than 48% are collectively referred to as high-alumina refractories.

Aluminum silicate refractories with an Al2O3 content of more than 48% are collectively referred to as high-alumina refractories.

There are too many refractories. "Practical Refractory Raw Materials Handbook - Guo Haizhu" is a very complete introduction to refractory raw materials. "Refractories for short-process steelmaking" and "Application of refractories" introduce the use of refractories.

Refractory Microstructure" introduces the microstructure of refractory materials. The "Kiln Lining Brick Size Design and Radial Bricklaying Calculation Manual" introduces the design of refractory bricks. The Refractory Handbook is a comprehensive and general introduction to all aspects of refractory materials published in 2007.

Refractory clay is one of the most basic and widely used raw materials in the refractory industry. Special refractory materials are mainly zirconia, titanium oxide, beryllium oxide, cerium oxide, thorium oxide, yttrium oxide, etc. These raw materials have different degrees of resistance to various slags, but because there are not many raw materials, they cannot be used in a large number of applications in the refractory industry, and the rotary kiln can only be used in special circumstances, so it is commonly known as special refractory raw materials.

There are many kinds of refractory raw materials, we can roughly divide them into the following categories, from these refractory raw materials, you can analyze which ones need a general mill for processing and milling. The raw materials of alkaline refractories are mainly magnesite (rhododite), dolomite, lime, olivine, serpentine, and high alumina oxygen raw materials (sometimes neutral), which have strong resistance to alkaline slag and are mostly used in masonry alkaline furnaces.

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Acid refractories use silicon oxide as the main component, and silica bricks and clay bricks are commonly used. Silica celery brick is a silica product containing more than 93% silicon oxide, the raw materials used are silica, waste silica bricks, etc., its resistance to acid slag erosion is strong, the load softening temperature is high, and the volume does not shrink after repeated calcination, and even expands slightly; However, it is susceptible to the erosion of alkaline slag and has poor thermal vibration resistance. Silica bricks are mainly used in thermal equipment such as coke ovens, glass melting furnaces, and acid steelmaking furnaces.

Clay bricks are made of refractory clay as the main raw material, containing 30% 46% alumina, which is a weakly acidic silver refractory material, with good thermal vibration resistance, corrosion resistance to acid slag, and is widely used.

Neutral refractories have alumina, chromium oxide, or carbon as the main components. Corundum products containing more than 95% alumina are a high-quality refractory material with a wide range of uses. The chromium bricks with chromium oxide as the main component have good corrosion resistance to steel slag, but the thermal vibration resistance is poor, and the deformation temperature of high temperature load is low.

Carbonaceous refractories include carbon bricks, graphite products and silicon carbide products, which have a very low coefficient of thermal expansion, high thermal conductivity, good thermal vibration resistance, high high temperature strength, resistance to acid, alkali and salt erosion, and are not wetted by metal and slag of the melting ruler, and are light in weight. It is widely used as a high-temperature furnace lining material, and is also used as an autoclave lining for petroleum and chemical industries.

Alkaline refractories use magnesium oxide and calcium oxide as the main components, and magnesia bricks are commonly used. Magnesium bricks containing 80% of magnesium oxide and more than 85% have good resistance to alkaline slag and iron slag, and have higher refractory resistance than clay bricks and silica bricks. It is mainly used in open-hearth, oxygen blowing converter, electric furnace, non-ferrous metal smelting equipment and some high-temperature equipment.

Refractory materials used in special occasions include high-temperature oxide materials, such as alumina, lanthanum oxide, beryllium oxide, calcium oxide, zirconia, etc., and refractory compound materials, such as carbide, nitride, boride, silicide and sulfide, etc.; High-temperature composite materials, mainly including cermets, high-temperature inorganic coatings and fiber-reinforced ceramics.