Product Description
Corundum Brick of refractory product with corundum
Corundum Brick
Corundum Brick is a kind of refractory product with corundum as the main crystal phase and contains over 90% aluminium oxide content. Corundum fire bricks have very high cold crushing strength that can reach up to 340MPa and high apparent initial softening temperature that is over 1700ºC. Corundum refractory brick can be used in blast furnace, hot blast stove, glass furnace and etc.
Corundum Brick Sales
Corundum Brick sales is quality high temperature refractory product. It has high refractoriness and good chemical stability. Because it is manufactured with corundum as the principal crystalline phase and contain more than 90% alumina content. Corundum can resist acid and alkaline slag erosion, and also the metal and glass liquid strongly.
Properties of Corundum Fire Bricks
- High temperature resistance
- High compression strength
- High dense structure
- Good thermal shock resistance
- Strong resistance to acid and alkaline slag erosion
- Good chemical stability
- Good resistance to metal and glass liquid
Zircon Bricks
Zircon Bricks, a kind of shaped refractory brick, are manufactured with stable zircon sand and over 64% zircon content. Zircon Brick belongs to acid refractory material with various properties of high mechanical strength, good thermal shock resistance, high refractoriness under load, strong erosion resistance and high density and etc. Zircon Bricks can be widely used in glass furnace, Ladle, pure steel furnace, non-ferrous metal smelting furnace and so on.
Fused Zirconia Corundum Brick
Fused zirconia corundum bricks are commonly called white iron bricks, also known as corundum-oblique zircon bricks. The main chemical composition is Al2O3 50%~70%, ZrO2 20%~40%, and the rest is SiO2. The main mineral composition is zircon (ZrO2), corundum (α-Al2O3), and glass phase. Oblique zircon crystals form the backbone of the brick body. ZrO2 has a high melting point (2715°C) and good chemical stability. It has strong corrosion resistance to acidic and alkaline media, especially molten glass. Fused zirconia corundum bricks are used in industrial furnaces such as glass furnaces. The use parts in glass furnaces are the masonry of the upper pool wall, small furnace flat slabs, small furnace stacks, tongue hangings, and breast walls.
Detailed Photos
Application of Corundum Refractory Brick
- Blast Furnace
- Hot Blast Stove
- Refining Furnace
- Glass Furnace
- Petrochemical Industrial Furnaces
- All kinds of high temperature kiln lining in metallurgical industry
Two Types Corundum Refractory Bricks
Corundum Brick includes two types of Sintered Corundum Brick and Fused Cast Corundum Brick.
- Sintered Corundum Brick adopts sintered alumina as the raw material through sintering process.
- Fused Cast AZS Brick can be made of fused alumina as the raw material through process method of sintering.
- And also can use phosphoric acid or other adhesive to make Unburnt Corundum Brick.
Corundum Fire Brick Manufacturing Process
Corundum Bricks include Fused Cast Corundum Brick, Fused Alumina Corundum Brick and Sintered Corundum Brick. Fused Cast Corundum Brick is manufactured with commercial alumina and little sodium carbonate and quartz powder fusing in the quartz powder and through process of casting and annealing, and then form the shape and size through machining.
Fused Alumina Corundum Brick is made of fused alumina particle and fines adding little fireclay and binding agent through molding by brick machine after mulling. The density of green brick is about 2.75~2.85g/cm3. After drying the bricks are fired in the temperature of 1700~1800ºC.
Zircon Bricks Properties
- High refractoriness under load
- Excellent thermal shock resistance
- Good corrosion resistance
- High mechanical strength
- Great creep resistance
- High density
Zircon Bricks Application
- Glass melting furnace.
- Ladle lining in the metallurgical industry.
- Areas of crown, burner, thermal couple, peep hole, and secondary layer of melter bottom and back lining.
- Areas of glass tank, such as paving part and secondary layer of paving bottom, back lining, wall and bottom of fore hearth, flowing spout and spinning portion and melter.
- Upper area of flame space or frequent thermal shock position.
- Lining of alkali-free or low-alkali glass, sodium-calcium glass, boron-silicate glass, ceramic glass, lead glass, and other technical glass melting furnace.
Technical Data
Physical and Chemical Index of Corundum Brick
| Item |
Unit |
High Purity Corundum Brick |
Common Corundum Brick |
Common Corundum Brick |
Mullite Corundum Brick |
Chrome Corundum Brick |
| |
|
DL-98 |
DL-95 |
DL-90 |
MDL-80 |
GDL-85 |
| Al2O3 ≥ |
% |
98.5 |
95 |
90 |
80 |
85 |
| SiO2 ≤ |
% |
0.3 |
3.0 |
9.0 |
18 |
0.2 |
| Fe2O3 ≤ |
% |
0.2 |
0.2 |
0.5 |
0.5 |
0.2 |
| R20 ≤ |
% |
0.3 |
0.6 |
0.6 |
0.4 |
0.5 |
| Bulk Density ≥ |
g/cm3 |
3.0 |
2.9 |
2.9 |
2.7 |
3.1 |
| Cold Crushing Strength ≥ |
MPa |
75 |
100 |
100 |
60 |
80 |
| Refractoriness ≥ |
ºC |
1790 |
1790 |
1790 |
1790 |
1790 |
| Deformation Temperature 0.2MPa ≥ |
ºC |
1700 |
1650 |
1650 |
1700 |
1700 |
| Linear Change On Reheating 1600*3h ≤ |
% |
0.2 |
0.2 |
0.2 |
0.3 |
0.2 |
| Thermal Stability (1100ºC) ≥ |
Times |
6 |
10 |
10 |
20 |
15 |
Zircon Bricks Specification
| Zircon Bricks |
| Item/Index |
ZR-30 |
ZR-50 |
ZR-55 |
ZR-60 |
ZR-62 |
| Al2O3 % |
42 |
10 |
6 |
4 |
- |
| SiO2 |
20 |
34 |
35 |
30 |
34 |
| ZrO2 |
30 |
50 |
55 |
60 |
62 |
| Bulk Density (g/cm3) |
≥3.10 |
≥3.30 |
≥3.45 |
≥3.50 |
≥3.60 |
| Apparent Porosity % |
≤21 |
≤20 |
≤20 |
≤21 |
≤20 |
| Compressive Strength (kg/cm2) |
≥500 |
≥400 |
≥500 |
≥500 |
≥500 |
| Refractoriness Under Load ºC (T2) |
>1500 |
>1450 |
>1500 |
>1600 |
>1550 |
| Expansion at 1000ºC (%) |
0.6~0.8 |
0.4~0.6 |
0.4~0.6 |
0.4~0.6 |
0.4~0.6 |
| Thermal Conductivity |
500ºC |
1.7 |
1.4 |
1.3 |
1.2 |
1.2 |
| 1000ºC |
1.8 |
1.6 |
1.5 |
1.5 |
1.5 |
| Application |
Glass Furnace |
Nozzle Seat |
Ladle |
Ladle |
Ladle Glass Furnace |
Zirconia Hollow Ball Brick
Zirconia hollow ball brick is a heat-insulating refractory product made of zirconia hollow ball as the main raw material. The main crystal phase of this brick is cubic zirconia, which accounts for about 70% to 80% of the mineral phase composition. The refractoriness is greater than 2400ºC, the apparent porosity is 55% to 60%, the bulk density is 2.5 to 3.0 g/cm3, the compressive strength is not less than 4.9 MPa, and the thermal conductivity is 0.23 to 0.35w/(m· K). The production method of zirconia hollow ball brick is the same as the production method of alumina hollow ball, except that its melting temperature is higher, reaching above 2700ºC. CaO is widely used as a stabilizer in China.
Zirconia hollow ball bricks are heat-insulating refractory products with excellent performance. The maximum safe use temperature is 2200ºC. It is used as a high-temperature lining material that directly contacts the flame in thermal equipment in metallurgy, petrochemical, electronics, and other industries. The zirconia hollow sphere products are entirely made of zirconia hollow spheres. With good high-temperature strength and stable pore structure, it is used as heat insulation material for furnace cover and other parts in ultra-high temperature equipment. For example, intermediate frequency high-temperature furnace, carbon black reactor, tungsten rod furnace, molybdenum furnace, etc.
Zirconia Mullite Cast Brick
Zirconia mullite fused cast bricks are fused cast refractory products made of mullite (3Al2O3·2SiO2) and zirconia (ZrO2) as raw materials. Zirconia mullite cast bricks have low porosity, high density, excellent chemical stability and wear resistance. Its corrosion resistance to molten glass is better than that of mullite cast bricks. Zirconia mullite cast bricks can be used in heating furnaces, soaking furnaces in the metallurgical industry, sidewalls of glass melting tank kilns in the building materials industry, and neck hanging walls.
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