High Alumina Refractory Bricks
Product Information
High-alumina refractory bricks are a type of aluminosilicate refractory material with alumina as the main component. With an alumina content exceeding 48%, they are classified as neutral refractory materials, made from bauxite or other raw materials with high alumina content through molding and calcination.
Classification:
Based on the alumina content, they are divided into three grades:
Grade 1: high-alumina bricks (Al₂O₃ content > 75%)
Grade 2: high-alumina bricks (Al₂O₃ content: 60%~75%)
Grade 3: high-alumina bricks (Al₂O₃ content: 48%~60%)
Physicochemical Properties:
1. Refractoriness
It can withstand high temperatures above 1770℃, generally ranging from 1750℃ to 1790℃. The refractoriness increases with the rise of alumina content.
2. Load Softening Temperature
It is generally 1420℃~1530℃. Owing to the high alumina content, low impurity content and minimal formation of fusible glass phase, its load softening temperature is higher than that of fire clay bricks.
3. Cold Compressive Strength
The cold compressive strength of Grade 1 high-alumina bricks (LZ-80) is ≥ 70 MPa, while that of Grade 3 high-alumina bricks (LZ-48) is ≥ 40 MPa.
4. Slag Resistance
High-alumina bricks are close to neutral refractory materials, which can resist the erosion of both acidic and alkaline slags, but their resistance to alkaline slags is weaker than that to acidic slags.
5. Apparent Porosity
The apparent porosity of Grade 1 high-alumina bricks is ≤ 21%, and that of Grade 3 high-alumina bricks is ≤ 22%.
Production Process:
The production process of high-alumina bricks is similar to that of multi-clinker fire clay bricks. The proportion of clinker in the mix can be as high as 90%~95%. Before crushing, the clinker needs to be graded, sorted and sieved for iron removal. The firing temperature is relatively high; Grade 1 and Grade 2 high-alumina bricks are generally fired at 1500℃~1600℃ in tunnel kilns.
Product Index
|
INDEX
|
SK-35
|
SK-36
|
SK-37
|
SK-38
|
SK-39
|
SK-40
|
|
Refractoriness(℃) ≥
|
1770
|
1790
|
1820
|
1850
|
1880
|
1920
|
|
Bulk Density(g/cm3) ≥
|
2.25
|
2.30
|
2.35
|
2.40
|
2.45
|
2.55
|
|
Apparent Porosity(%) ≤
|
23
|
23
|
22
|
22
|
21
|
20
|
|
Cold Crushing Strength(MPa) ≥
|
40
|
45
|
50
|
55
|
60
|
70
|
|
Permanent Linear Change@1400°×2h(%)
|
±0.3
|
±0.3
|
±0.3
|
±0.3
|
±0.2
|
±0.2
|
|
Refractoriness Under Load @ 0.2MPa(℃) ≥
|
1420
|
1450
|
1480
|
1520
|
1550
|
1600
|
|
Al2O3(%) ≥
|
48
|
55
|
62
|
70
|
75
|
80
|
|
Fe2O3(%) ≤
|
2.0
|
2.0
|
2.0
|
2.0
|
2.0
|
1.8
|
Application
High alumina bricks are mainly used for VOD, AOD, blast furnaces, hot blast furnaces, EAF, reverberatory furnaces, and rotary kiln linings. In addition, high alumina bricks are also widely used as open-hearth heat storage checker bricks, plugs for pouring systems, nozzle bricks, etc.
Company Profile
Shandong Robert New Material Co., Ltd. is located in Zibo City, Shandong Province, China, which is a refractory material production base. We are a modern enterprise that integrates the research and development, production, sales, kiln design and construction, technology, and export refractory materials. We have complete equipment, advanced technology, strong technical strength, excellent product quality, and good reputation. Our factory covers over 200 acres and an annual output of shaped refractory materials is approximately 30000 tons and unshaped refractory materials is 12000 tons.
Our main products of refractory materials include: alkaline refractory materials; aluminum silicon refractory materials; unshaped refractory materials; insulation thermal refractory materials; special refractory materials; functional refractory materials for continuous casting systems.
Frequently Asked Questions
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We are a real manufacturer, our factory is specialized in producing refractory materials for more than 30 years. We promise to provide the best price, the best pre-sale and after-sale service.
For each production process, RBT has a complete QC system for chemical composition and physical properties. And we will test the goods, and the quality certificate will be shipped with the goods. If you have special requirements, we will try our best to accommodate them.
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