Definition:
Low Creep High Alumina Refractory Bricks is a kind of refractory material. The main component of this refractory brick is Al2O3.
Due to different resources, national standards are not completely consistent. For example, European countries stipulate that the lower limit of Al2O3 content for high aluminum refractory is 42%.
In China, the Al2O3 content in high-alumina bricks is usually divided into three grades: Ⅰ etc.-Al2O3 content> 75%; Ⅱ etc.-Al2O3 content is 60 ~ 75%; III etc.-Al2O3 content is 48 ~ 60%.
Low Creep High Alumina Refractory Bricks is a neutral refractory with alumina content above 48%.
Low Creep High Alumina Refractory Bricks can be divided into three process: Raw material, molding, burning.Generally, refractory brick was molded by dry pressing. By means of mixing the material uniformity in proportion and aging mixture some time. Then, pour some powders into the module and dry pressing. After dry pressing, the adobe need to pushed in the drying kiln to stoving or stay in the air to drying. This progress will need about 3-5 days. After this progress, then push the adobe into the tunnel furnace or shuttle kiln to burning around 1300C. This progress will be need about 5-7 days.
After burning, the brick will be packed in pallet and leave the factory.
Advantage:
(1) Refractoriness:
The refractoriness of high-alumina bricks is higher than that of clay bricks and semi-silicon bricks, reaching 1750-1790℃, which belongs to advanced refractory materials.
(2) Load softening temperature:
Because of high Al2O3 in high-aluminum products, less impurities, and less fusible glass body, the load softening temperature is higher than clay bricks, but the mullite crystal does not form a network structure, so the load softens The temperature is still not as high as silicon brick.
(3) Thermal conductivity:
High aluminum brick has better thermal conductivity than clay brick
(4) Thermal shock resistance:
The thermal shock resistance of high alumina bricks is between clay products and silica products
Application:
Low Creep High Alumina Refractory Bricks that mainly used for lining blast furnaces, hot blast stoves, electric furnace tops, blast furnaces, reverberatory furnaces, rotary kilns. In addition, high-alumina bricks are also widely used as open-hearth regenerative lattice bricks, plugs for pouring systems, nozzle bricks, etc.
However, the price of high alumina bricks is higher than that of clay bricks, so it is not necessary to use high alumina bricks where clay bricks can meet the requirements.
Product Description:
| Low Creep High Alumina Refractory Bricks |
| Item | Unit | DRL-155 | DR-150 | DRL-145 | DRL-140 | DRL-135 | DRL-130 | DRL-127 |
| Al2O3 | % | ≥75 | ≥75 | ≥65 | ≥65 | ≥65 | ≥60 | ≥50 |
| Apparent Porosity | % | ≤20 | ≤21 | ≤21 | ≤22 | ≤22 | ≤22 | ≤23 |
| Bulk Density | % | 2.65~2.85 | 2.65~2.85 | 2.5~2.7 | 2.4~2.6 | 2.35~2.55 | 2.3~2.5 | 2.3~2.5 |
| Cold Crushing Strength | Mpa | ≥60 | ≥60 | ≥60 | ≥55 | ≥55 | ≥55 | ≥55 |
| Creep Rate(0~50h ,0.2MPa) | % | 1550℃
0.8 | 1500℃
0.8 | 1450℃
0.8 | 1400℃
0.8 | 1350℃
0.8 | 1300℃
0.8 | 1270℃
0.8 |
| Linear Change on Reheating | % | 1550℃×2h
0.1 ~ -0.2 | 1550℃×2h
0.1 ~ -0.2 | 1550℃×2h
0.1 ~ -0.2 | 1450℃×2h
0.1 ~ -0.2 | 1450℃×2h
0.1 ~ -0.4 | 1450℃×2h
0.1 ~ -0.4 | 1450℃×2h
0.1 ~ -0.4 |
Company Profile
Zhengzhou Annec CO., Ltd. was founded in 2003, and has been a NASDAQ listed corporation since 2011 with ticker identification ANNC. Annec had become the industrial leader within China in the areas of refractory production, Engineering for hot blast stove of blast furnace, and capability for EPC project. Annec has its own Provincial Enterprise Technology Center and Top Combustion Hot Blast Stove Research Centre, Annec (Beijing) Engineering & Technology Co., Ltd and four Manufacturers for Refractories. The annual output of different type of refractories can reach 150 thousand tons, and undertaken capability of more than 10 turnkey projects for hot blast
Annec has established a strong research and development team, represented by 11 wee known experts including prof. Zhou Gouzhi, an academician of Chinese academy of sciences, Mr. Wu Qichang, Chinese national design master of iron-making engineering. Prof. Zhang Bopeng, Inventor of the top combustion hot blast stove in Shougang Steel. The team possesses a multi-subject crossing and combination superiority in terms of metallurgy, materials science and engineering, thermal engineering, structure engineering, etc. And is beneficial to aim at the front of world steelmaking technology and continuously new technologies and new products to meet challenges of greenization, intelligence and collaboration in steelmaking industry and refractories industry.
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high strength low creep high alumina refractory bricks for hot blast stove ironmaking furnace Images
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