High Alumina Bricks are a kind of refractory bricks for sale in RS Company, whose main component is Al2O3. High Alumina Bricks have lots of different properties due to its different uses, such as high refractoriness, high strength, acid and washing erosion resistance, good thermal stability and so on. High Alumina Bricks are mainly used for masonry blast furnace, hot-air furnace, electric furnace, reverberatory furnace, etc. As a leading manufacturer, RS in China adheres to the product quality as life, enterprise honesty as the foundation,winning the trust and praise from customers at home and abroad. Therefore, RS can provide you high quality products at low price. Welcome to contact us for free quotation/price list.
What Is High Alumina Bricks?
High alumina bricks usually refer to the aluminum silicate refractory materials that contain Al2O3 above 48%. As a neutral refractories with an alumina content above 48%, High-alumina bricks are shaped and calcined from bauxite or other high-alumina raw materials.
Characteristics of High Alumina Brick
- Good thermal stability
- High refractoriness, more than 1770℃
- Good thermal conductivity and good thermal shock resistance
- High temperature creep is small
- Wear and spalling resistance, and chemical resistance
High Alumina Bricks Specification
|Cold Crusing Strength ≥||60||55||40|
|Apparent Porosity(%) ≤||20||22||23|
|Bulk Density(g/cm*) ≥||2.5||2.4||2.3|
|0.2MPa Refractoriness Under Load ≥||1500||1470||1450|
|Refiring Linear Change||0~-0.2||0~-0.2||±0.2|
High Alumina Bricks Uses
High Alumina Bricks are mainly used for masonry blast furnace, hot-air furnace, electric furnace, blast furnace, reverberatory furnace, rotary kiln lining. In addition, high-alumina bricks are widely used as refrigerated lattice bricks for open hearth furnaces, plug heads for gating systems, and nozzle bricks.
High Alumina Bricks Classification
According to different Al2O3 contents, High Alumina Bricks can be classified into Three Grades in China.
- Grade I : High Alumina Bricks have Al2O3 content above 75%.
- Grade II : High Alumina Bricks have Al2O3 content about 60~75%.
- Grade III : High Alumina Bricks have Al2O3 content about 48~60%.
In addition, High Alumina Bricks can also be classified according to its mineral composition, generally divided into the following five categories:Low mullite（including Sillimanite）, mullite（48%～71.8%）, mullite-corundum, corundum-mullite（71.8%～95%） and corundum（95%～100%）.
High Alumina Bricks Composition
High alumina brick is made of high-quality bauxite clicker as starting material by sgaping at high pressure and sintering at high temperature. High alumina bricks consist of the following parts:
- Alumina: above 48%
- Clinker: up to 90-95%
- Raw materials:bauxite, corundum, and clay
- Production technology: crushing, mixing, molding, drying, firing, inspecting, and packing.
High Alumina Bricks Properties
High alumina brick has high thermal stability, good slag-resistance, and their refractoriness is above 1770°C.
Besides, High Alumina Brick has the advantages of high temperature creep, strong erosion resistance, good thermal shock resistance, etc. It is suitable for large and medium-sized hot blast stoves. Because of the higher Al2O3 proportion, the chemical properties of high alumina bricks are close to neutral refractory, which is resistant to acid and alkaline slag erosion.
High Alumina Bricks Manufacturing Process
The production process of high-alumina bricks is similar to that of multi-clinker clay bricks. The difference is that the proportion of clinker in the ingredients is relatively high, up to 90~95%. The clinker must be sorted and sieved to remove iron before crushing and the sintering temperature is higher. For example, Grade I & II High Alumina Bricks can be fired in the high temperature of 1500~1600℃ in the tunnel kiln. In production, the method of forming a mixture of smut and mud particles is usually adopted to improve the grain structure characteristics of the high-alumina brick, thereby improving its thermal shock resistance.
High Alumina Bricks Price
When it comes to high alimina bricks, we always think of fireclay bricks. But high alumina bricks usually are better than fireclay. Why? Maybe the next chart can tell you something.
Comparision Between High Alumina Index and Fireclay Brick Index
|Items/Brands||High aluminum brick||Clay brick|
|AL2O3, % ≥||65||55||48||42||42|
|Fe2O3, % ≤||2||2||2||1.6||1.7|
|Apparent Porosity(%) ≤||19||19||18||15||16|
|Cold Crushing Strength ≥||58.8||58.8||49||58.8||49|
|Bulk Density(g/cm*) ≥||2.6||2.5||2.4||2.3||2.2|
|Permanent Linear Change||0~-0.2||0~-0.2||0~-0.2||0~-0.2||0~-0.3|
|0.2MPa Refractoriness Under Load ≥||1500||1480||1450||1450||1430|
The difference between high-alumina brick and fireclay brick is that the content of Al2O3 is different, and the AL2O3 of fireclay brick is between 30% and 48%, but the Al2O3 of high alumina brick is above 48%. The slag resistance of high alumina bricks also increase with the increase of Al2O3 content. Therefore, compared with fire clay bricks, high alumina bricks have good performance and long service life. The price of high-alumina bricks is higher than that of fire clay bricks.
Raw Materials Of High Alumina Bricks In China
China is rich in high-alumina vanadium resources, which has excellent quality in texture. According to different resource conditions and product requirements, the following types of raw materials of high alumina bricks can be used:
- High-alumina bauxite mainly composed of hydrous alumino-oxygen minerals
- (one water aluminum, aluminum trihydrate, etc)
- Sillimanite mineral (Kyanite, Andalusite, Sillimanite)
- Synthetic raw materials
High Alumina Bricks Application
As neutral refractories, High-alumina bricks have strong resistance to acidic and alkaline slags, have high refractoriness and high-temperature mechanical strength, and are slightly inferior in resistance to quenching and hot-heating than clay bricks, and have a higher cost than clay bricks. High alumina bricks are mainly used for the furnace bottom of the soaking furnace, the lower furnace wall, the furnace wall of the continuous heating furnace, the ceiling, the bottom of the furnace and the burner brick.
High Alumina Bricks Manufacturer
Now Rongsheng have professional sales team, senior professional technicians and complete manufacturing and testing equipment with continuous innovation and development. Our products are popular in the whole country and have been exported to Vietnam, India, Korea, Russia, Pakistan, Iran,etc. Welcome to contact us for high quality bricks in RS at a low price!