커런덤 벽돌
Corundum bricks are refractory products with alumina content greater than 90% and corundum as the main crystalline phase. Corundum bricks have high normal temperature compressive strength (up to 340MPa). High load softening onset temperature (greater than 1700 ℃).
The corundum refractory bricks produced by PER Refractories can be used in blast furnaces, 뜨거운 용광로, 유리 가마, 등등. They have good chemical stability, and strong resistance to acidic or alkaline slag, metals, and glass liquids. The thermal shock stability is related to its organizational structure, and the erosion resistance of dense products is good.
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Types Of Corundum Brick
Ordinary Corundum Brick
Corundum bricks are refractory products with alumina content greater than 90% and corundum as the main crystal phase. 상온 압축강도 (up to 340MPa) is high, load softening start temperature (more than 1700 ℃), good chemical stability, acidic or alkaline slag, metal and glass liquids have strong resistance.
This corundum brick is widely used in petrochemical and fertilizer industry cracking, conversion furnace, the metallurgical industry, and other high-temperature kiln lining, and kiln furniture. Ironmaking blast furnaces and blast furnaces hot blast furnaces, steelmaking furnaces outside the refining furnace, sliding water apparatus, glass melting kilns and petrochemical industry furnaces, 등등.
Lightweight Corundum Brick
Lightweight corundum brick is also known as alumina insulation brick, foam corundum brick, or foam alumina brick. It contains more than 90% 알루미나, mainly composed of corundum lightweight refractory materials. The refractoriness is high, and the volume shrinkage of refiring is small. Compressive strength 4～25MPa, bulk density 0.8～1.35g/cm3. 낮은 열전도율. Good thermal shock resistance.
Lightweight corundum bricks can be used for the thermal insulation layer of thermal equipment, or thermal equipment lining with the direct action of the flame, but should not be used for the slag direct erosion. The maximum operating temperature is generally up to 1650℃, and products with high purity can reach 1800℃.
Chrome Corundum Brick
Chrome corundum bricks are corundum refractory products containing Cr2O3. At high temperatures, Cr2O3 and Al2O3 form a continuous solid solution, so the high-temperature performance of chrome corundum products is better than pure corundum products. It has a tough texture, dense structure, and high strength. Chromium corundum bricks have the advantages of high refractoriness, 고강도, good thermal shock stability performance, and strong erosion resistance. 긁힘에 강합니다., touch damage, 부식, and spalling in use.
It has good use in metallurgy, 유리, 석유화학, and environmental protection hazardous waste disposal industry.
Electrofused Corundum Bricks
Al2O3 content in α-βAl2O3 전기융합 벽돌 is ≥94%, and its crystalline phase structure is composed of 45~55% α-Al2O3 phase and 45~60% β-Al2O3 phase. Its load-softening temperature is ≥1750℃. Its density is 3.38 에게 3.39 g/cm3, of which electrofused α-βAl2O3 bricks are very good bricks for floating glass melting kilns used in the working part of the wall part of the cross-passage pool. For large kilns, it is mainly used in the working section, cross-pass, and branch-pass.
강옥 물라이트 벽돌
Corundum-mullite bricks are high-alumina refractory products composed of corundum and mullite main crystal phases. The physical and chemical properties of corundum-mullite brick are as follows: Al2O3>85%, Fe2O3 0.45%, apparent porosity 19%, room temperature compressive strength greater than 55MPa loaded softening temperature greater than 1700℃, heating line change (1600℃, 3시간)-0.1%, 열 충격 저항 (1100℃ water-cooled) greater than 30 타임스. 고온강도가 좋다, high-temperature creep resistance, 열 충격 저항, 내식성.
Corundum mullite bricks are mainly used in harsh industrial environments such as high temperature, high pressure, high speed, and corrosion. This includes the lining of sintering furnaces, heating furnaces, and other equipment and the manufacture of sintered bricks in metallurgical, 화학적인, and electric power industries.
Performance Index of Corundum Brick
The raw material used in corundum bricks is a solid solution synthesized by melting alumina and chromium oxide at a certain ratio. The use of a special refractory production process to make refractory bricks, can improve and enhance the intrinsic quality of the products, and improve the high-temperature performance of the products.
The physical and chemical performance indexes of some high-performance corundum bricks developed and produced by PER Refractories Factory have reached the performance indexes of some similar products and corundum bricks in foreign countries. Our corundum bricks have been widely used as lining materials in petrochemical thermal installations which are characterized by high temperature, high pressure, 화학적 침식, and severe mechanical abrasion.
With the progress of production technology in the petrochemical industry, many new techniques and technologies have been adopted in production, to make the equipment achieve the purpose of large load, long cycle, low energy consumption, and low cost.
The corundum bricks produced and supplied by PER Firebricks company are mainly used in ironmaking blast furnaces and blast furnaces hot blast furnaces, refining furnaces outside the steelmaking furnace, sliding water apparatus, glass melting kilns, and petrochemical industry furnace.
Application Scenarios of Corundum Brick
In the steel industry, the service life of chrome corundum bricks is more than double that of corundum bricks, such as ladle air-permeable bricks.
In the non-ferrous smelting industry, corundum bricks are significantly better than other bricks in terms of wear resistance and erosion resistance.
In the carbon black industry, the life span of corundum bricks is twice as long as that of corundum bricks used under the same conditions.
The AK-type chrome corundum bricks are used in the carbon black reactor of the carbon black factory, and their service life has exceeded that of corundum bricks.
In the petrochemical industry, large and medium-sized fertilizer plant gasifiers due to long-term high temperature (1350 ~ 1450 ℃), high pressure (3.1 ~ 8.53 MPa), a strong reducing atmosphere (CO + H2 + CH4), and the gas velocity (about 10 m – s-1).
The erosion and damage to the furnace lining refractories are more serious, so the requirements for the furnace lining refractories are higher.
High-performance corundum bricks have high density and strength and are more resistant to gas scouring and abrasion than corundum bricks.
The introduction of Cr2O3 in corundum bricks changes the intrinsic quality of the product, making the brick’s resistance to slag erosion and permeability significantly improved. The use of corundum bricks in gasifiers can improve the service life of gasifiers.
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