High alumina fire bricks mean bricks with Al2O3 content over 48%. Raw material is high alumina bauxite or other refractory raw materials with high alumina content like tabular alumina, calcined alumina etc. High alumina bricks are with stable properties, high refractoriness over 1770℃, excellent slag resistance etc. They are widely used for linings of ELectric Arc Furnace, glass smelting furnace, cement rotary kiln etc.
Bricks with high refractoriness under load and low creep performance are made from high quality raw materials like super grade bauxite, fused corundum, fused mullite etc. Such bricks with low thermal creep, high corrosion resistance, excellent thermal shock resistance etc., they are proper for large and medium hot blast stove.
Producing process for high alumina bricks are similar to that of calcined fire clay bricks. For high alumina fire bricks, calcined raw materials are more applied, about 90~95%. The calcined raw materials are distributed and treated with iron removal before being grinding, so firing temperature of high alumina bricks is higher. The super and top grade high alumina bricks are sintered under temperature 1500-1600 ℃
One of the important working properties of high alumina fire brickis its structural strength at high temperature, which is usually evaluated by load softening deformation temperature. The high temperature creep was also measured to reflect the high temperature structural strength. The test results show that the softening temperature under load increases with the increase of Al2O3 content.
When the content of alumina is less than 70%, the load softening temperature of high alumina refractory depends on the proportion of mullite crystal phase and liquid phase, and increases with the increase of mullite content. The amount and properties of liquid phase have obvious influence on the softening temperature under load. Therefore, reducing the impurity content in the raw material is beneficial to improve the load softening temperature and high temperature creep.
HIGH ALUMINA FIRE BRICKS Product Data:
|
Material |
Common |
Special |
|||||||||||||
|
Item |
SK36 |
SK38 |
TS80 |
TS85 |
SL-92 |
SL-90 |
SL-85 |
SL-80 |
SL-75 |
SL-70 |
SL-60 |
SL-50 |
|||
|
Pyrometric Cone Equivalent Orton cone |
35-36 |
37-38 |
38 |
﹥38 |
40 |
40 |
40 |
39 |
39 |
38 |
37 |
36 |
|||
|
Refractoriness (℃) |
1785 |
1810 |
1835 |
1840 |
– |
– |
– |
– |
– |
– |
– |
– |
|||
|
0.2 MPa soft under load (%) |
– |
– |
– |
– |
1700 |
1700 |
1700 |
1670 |
1650 |
1580 |
1550 |
1500 |
|||
|
Bulk Density (kg/m³) |
2300-2350 |
2400-2450 |
2550-2650 |
2650-2750 |
3.10 |
2.95 |
2.90 |
2.85 |
2.70 |
2.62 |
2.50 |
2.40 |
|||
|
Apparent Porosity (%) |
20.0-22.0 |
19.0-20.0 |
18.0-19.0 |
17.0-18.0 |
16 |
16 |
19 |
18 |
18 |
18 |
18 |
18 |
|||
|
Cold Crushing Strength (MPa) |
45-48 |
50-55 |
60-65 |
70-75 |
80 |
80 |
800 |
750 |
700 |
700 |
650 |
600 |
|||
|
Modulus of Rupture (kg/cm²) |
70-80 |
80-90 |
90-100 |
150-180 |
– |
– |
– |
– |
– |
– |
– |
– |
|||
|
Thermal Expanison at 1000℃(%) |
– |
– |
– |
– |
– |
– |
0.75 |
0.7 |
0.65 |
0.60 |
0.55 |
0.50 |
|||
|
Reheat test,permanent linear change after heating at |
1500℃,2h(%) |
– |
– |
– |
– |
±0.2 |
±0.2 |
±0.2 |
±0.2 |
±0.2 |
±0.2 |
±0.2 |
±0.2 |
||
|
1400℃(%) |
(+)0.5 |
(+)1.00 |
(+)1.02 |
– |
– |
– |
– |
– |
– |
– |
– |
– |
|||
|
SiO2 (%) |
38.2 |
20.2 |
14.0 |
8.7 |
– |
– |
– |
– |
– |
– |
– |
– |
|||
|
Al2O3 (%) |
48-55 |
70-75 |
81.1 |
85 |
92 |
90 |
85 |
80 |
76 |
70 |
65 |
50 |
|||
|
Fe2O3 (%) |
1.8 |
1.8 |
1.8 |
1.8 |
0.8 |
0.8 |
1.0 |
1.0 |
– |
– |
– |
– |
|||
|
Cao (%) |
0.4 |
0.4 |
0.3 |
0.2 |
– |
– |
– |
– |
– |
– |
– |
– |
|||
|
Na2O+K2O+Li2O (%) |
0.5 |
0.5 |
0.3 |
0.2 |
– |
– |
– |
– |
– |
– |
– |
– |
|||
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