Magnesia chrome brick
Material and Technique
12% 16% Cr2O3 lower porosity direct bonded magnesia chrome bricks for cement rotary kiln use high purity sintered magnesia and chromium concentrate as main raw materials, manufactured by sintering at high temperature or ultra-high temperature.
In order to form direct bonded, the SiO2 content in raw materials is best to low, and that the sintering temperature must be raised to about 1700℃.
Properties
Direct bonded magnesia chrome bricks have the advantages of less impurities, lower porosity, high strength, strong abrasion resistance, high corrosion resistance, high thermal shock-resistance and good anti-stripping capacity.
|
Index |
DMC12A |
DMC9A |
DMC12B |
DMC9B |
DMC20C |
DMC18C |
DMC16C |
DMC12C |
|
MgO(%) ≥ |
65 |
70 |
65 |
75 |
55 |
60 |
65 |
70 |
|
Cr2O3(%) ≥ |
12 |
9 |
12 |
9 |
20 |
18 |
16 |
12 |
|
SiO2(%) ≤ |
2.5 |
2.2 |
2.0 |
1.8 |
2.5 |
2.4 |
2.4 |
2.0 |
|
Apparent porosity(%) ≤ |
18 |
18 |
18 |
18 |
18 |
18 |
18 |
18 |
|
Bulk density(g/cm3) ≥ |
3.00 |
3.00 |
3.05 |
3.05 |
3.15 |
3.10 |
3.05 |
3.00 |
|
Cold Crushing Strength MPa ≥ |
40 |
40 |
40 |
40 |
40 |
40 |
40 |
40 |
|
Refractoriness Under Load 0.2MPa℃ |
1650 |
1650 |
1680 |
1680 |
1700 |
1700 |
1700 |
1680 |
|
Thermal Shock Resistance 950℃ Air cooling, 1100℃ Water cooling (times) ≥ |
4 |
4 |
6 |
6 |
6 |
6 |
6 |
6 |
