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Types of high alumina bricks commonly used in industrial kilns

2019-03-26
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1. Ordinary high aluminum brick


(1) The main mineral composition of the brick is mullite, corundum and glass phase. As the content of Al2O3 in the product increases, mullite and corundum also increase, the glass phase will decrease accordingly, and the refractoriness and high temperature performance of the product will increase.


(2) Ordinary high-alumina brick has a series of better fire resistance than clay products. It is a material with good application effect and wide use. Widely used in various thermal furnaces. Compared with clay products, it can effectively increase the service life of the kiln.


2. High-load soft high-alumina brick


Compared with ordinary high-alumina bricks, high-load soft high-alumina bricks differ in the matrix part and the binder part: the matrix part, except for the addition of three stone concentrates, is reasonably introduced according to the theoretical composition of the mullite after the chemical composition after firing High-alumina materials, such as corundum powder, high-aluminum corundum powder, etc.; the choice of high-quality ball clay, etc., depending on the variety of different clay composite binder, or mullite binder. Through the above method, the load softening temperature of high alumina bricks can be increased by about 50 ~ 70 ℃.


3. High aluminum brick with low creep


By using the so-called unbalanced reaction to improve the creep resistance of high alumina bricks. That is, according to the use temperature of the kiln, adding three stone minerals, activated alumina, etc. to the matrix to make the composition of the matrix close to or completely composed of mullite, because the mullite of the matrix will definitely increase the mullite content of the material , Reduce the glass phase content, and the excellent mechanical and thermal properties of mullite are conducive to the improvement of the high temperature performance of the material.


4. Phosphate combined with high alumina brick


(1) Phosphate-bonded high-alumina brick is made of compact super-grade or first-grade high-alumina bauxite clinker as the main raw material, phosphate solution or aluminum phosphate solution as the binding agent, after semi-dry machine press molding, it is 400 to 600 Chemically bonded refractory products made by heat treatment at ℃.


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(2) It belongs to non-fired bricks. In order to avoid large shrinkage of products during use, it is generally necessary to introduce heated and expandable raw materials, such as kyanite and silica, into the ingredients.


(3) Compared with the fired high-alumina brick combined with ceramics, its anti-stripping performance is better, but its load softening temperature is lower, and its anti-erosion performance is poor. Therefore, a small amount of fused corundum, mullite, etc. need to be added. To strengthen the matrix. Phosphate combined with high alumina bricks are widely used in cement kilns, electric furnace roofs and other kiln parts.


5. Micro-expansion high alumina brick


(1) The brick is mainly made of high-alumina bauxite, added with three-stone concentrate, and made according to the production process of high-alumina brick. In order to make the high-alumina brick expand appropriately during use, the key is to choose the three-stone concentrate and its particle size, control the firing temperature, make the selected three-stone mineral part mullite, and leave some three-stone mineral.


(2) The remaining three stone minerals are further mulliteized (primary or secondary mulliteized) during use, accompanied by volume expansion. The selected three-stone mineral is preferably a composite material, because the decomposition temperature of the three-stone mineral is different, and the expansion caused by mullite is also different.


(3) Using this feature, high alumina bricks have corresponding expansion effects due to different working temperatures, squeezing the brick joints, improving the overall compactness of the lining, and thus improving the brick's resistance to slag penetration.



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