Grade and characteristics of high alumina brick

high alumina bricks

Aluminum oxide (Al2O3) content higher than 48% of alumina silicate refractory products. An alumina content of more than 48% of a neutral refractory material. Of alumina or other high alumina content of raw materials by forming and calcination. High thermal stability, Refractoriness above 1770 ℃, Slag resistance good, used for  the lining of masonry furnace, glass furnaces, cement rotary kiln, etc.

Alumina bricks is a refractory materials, the main ingredient of such a refractory brick is AL2O3. Such as Al2O3 content higher than 90%, called corundum brick. Due to the different resources, national standards are not entirely consistent. European countries such as high alumina refractories prescribed limit of 42% Al2O3 content. In China, according to the high alumina bricks Al2O3 content is usually divided into three classes: Ⅰ Grade ──Al2O3 content> 75%;  Ⅱ Grade──Al2O3 content 60 ~ 75%; Ⅲ Grade ──Al2O3 content 48 to 60%.

Soft high load, low creep high alumina brick is a premium alumina, fused alumina, fused mullite refractory materials as the main raw material. The product has a small temperature creep, corrosion resistance, good thermal shock resistance, etc., suitable for large and medium-sized stove, it is required for our new high-quality stove, imports of high-grade refractory localization open next Road to Success.

Characteristic as follows:

a, refractoriness; high alumina bricks refractoriness are higher than clay and semi-silica brick refractoriness up to 1750 ~ 1790 ℃, belonging to high-grade refractory.

b, load softening temperature; high aluminum products because of high Al2O3, less impurities, less fusible vitreous formed, so load softening temperature is higher than the clay brick, but not formed mullite crystalline , so load softening temperature silica brick is still not high.

c, slag resistance; Al2O3 in alumina bricks are more close to neutral refractories, resistant to erosion of acid and alkaline slag slag, because it contains SiO2, so resistance to alkaline slag ratio of acid slag ability weaker.

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Grade and characteristics of high alumina brick
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Corundum brick introduction

Corundum brick

Alumina content of corundum brick is more than 90%, it is refractory material using corundum as the main crystalline phase. High cold crushing strength (up to 340MPa), high refractoriness under load. Good chemical stability, strong resistance to acid or alkaline slag, metal, and glass liquid. Corundum brick can be divided into two kinds refractory brick, namely sintered corundum brick and fused corundum brick. It can use sintered alumina and fused corundum as raw materials, produced by sintering method. It can also be made of phosphoric acid or other binders into non -fired corundum refractory brick. Refractory Suppliers corundum bricks is mainly used in blast furnaces, vod furnaces, blast furnaces, water heaters, glass furnaces and petrochemical furnaces.

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Corundum brick introduction

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Purpose and related properties of magnesia brick

Magnesia Brick

The main components of the magnesia brick：

The magmesia bricks' main composition is magnesia, and the main crystal is periclase, accounting for 80% of the magnesia bricks quality - 90%, its matrix compound for magnesium, magnesium aluminate spinel ferrite, magnesium olivine, calcium magnesium olivine, etc.

The classification of magnesia brick:

Magnesia bricks generally divided into sintered magnesia refractory brick and chemical combination of two kinds of magnesia bricks. And sintering temperature of high purity magnesite bricks, because the periclase grains, direct contact is called direct combination of magnesite bricks; Electric fused magnesia as raw material made of brick is called reunited fused magnesia brick.

The uses of the magnesite brick:

Because of the high temperature performance is good, the alkaline slag resistance is strong, so the magnesia bricks properties widely used in steel industry steelmaking furnace lining, the ferroalloy fiber cable furnace, mixer; Non-ferrous metallurgical industry furnace, such as copper, lead, zinc, tin, lining; Building materials industry kiln; Glass industry body and heat exchanger regenerator grid; refractory material industry of high temperature calcination kiln, shaft kiln, tunnel kiln, etc.

The important thing:

While the high-temperature calcined magnesite raw materials and products are, but it still has the hydration. Magnesite brick hydration resistance ability at high temperature is lower. So should pay attention to waterproof under any circumstances.

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Purpose and related properties of magnesia brick
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Dolomite brick and magnesia dolomite brick

Dolomite brick and magnesia dolomite brick

The main component of dolomite is calcium magnesium carbonate. Mohs hardness (MOH) is between 3.5 and 4.
 
Dolomite bricks is made as refractory products from calcined dolomite sand. Generally refractory materials dolomite brick has more than 40% CaO, more than 35% MgO and some SiO2, Al2O3, Fe2O3 and some other impurities. The ratio of CaO/MgO in natural dolomite is little large. If the ratio of CaO/MgO is less than 1.39, it will be called magnesite dolomite brick.

In China, Chinese mainly use resin bonded dolomite refractory bricks and resin bonded magnesite dolomite brick for converter furnace . Some factories use light burning oil and oil fired magnesia refractory products for sale dolomite brick in easily damaged part. In Western Europe and Japan, people usually use resin bonded and oil fired dolomite brick and magnesite material dolomite brick for their converter furnace. Besides, magnesite dolomite bricks also can be used for lining of some refining furnaces.

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Dolomite brick and magnesia dolomite brick
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