1. Magnesium chrome brick is generally produced by sintered magnesia (MgO content is between 89 ~ 92) and chromium-refractory materials. Refractory grains are combined by silicate due to its impurities. The commonly known as magnesium chrome bricks in China is generally refers to the ordinary burned magnesium chrome bricks.
Magnesium chrome brick is also called magnesium silicate bonded chrome bricks and magnesium chrome bricks for short.
The production process of ordinary Magnesium chrome brick is simple and its price is cheap and that are widely used in rotary cement kiln.
Directly bonded magnesium chrome brick is the product that is produced by chrome ore with lower impurity and magnesia with high purity that is sintering in a temperature above 1700 ℃. The refractory grains are contacted directly. The direct combination as a micro-structure parameter is not only used in magnesium chrome materials but also in other materials.
The main difference of production process between direct combination magnesium chrome brick and magnesium chrome brick is that the first is used pure raw material and sintered in higher temperature.
Direct combination magnesium chrome bricks have good slag resistance and high temperature performance due to its less impurity in the chemical composition and the high combination rate between refractory grains. Its thermal shock resistance is excellent and can reach 6 to 10 times from 1100 ℃ to cold water.
2.
Applications:
the mainly used for cement rotary kiln, lime kiln and refractory calcining kiln.
3.
Chemical and Physical Index
| Index |
Standard |
Semi-direct bonded |
direct bonded |
MgO/%≥ |
55~60 |
≥65 |
≥70 |
≥70 |
≥75 |
≥80 |
Cr2O3/%≤ |
8~12 |
8~13 |
≥9 |
≥9 |
≥6 |
≥4 |
SiO2/% |
≤5.5 |
≤4.0 |
≤3.0 |
≤2.8 |
≤2.8 |
≤2.5 |
volume density ./kg.m-3 |
2850 |
2900 |
≥2980 |
≥2980 |
≥2950 |
≥2930 |
Apparent porosity%≤ |
23~24 |
20~22 |
≤19 |
≤19 |
≤18 |
≤18 |
Compress strength,/MPa≥ |
≥20 |
≥35 |
≥40 |
≥40 |
≥40 |
≥40 |
refractoriness under load, ℃≥ T0.6
T2 |
≥1530 |
≥1550 ≥1650 |
≥1580 ≥1700 |
≥1600 ≥1700 |
≥1600 ≥1700 |
≥1600 ≥1700 |
Linear expansivity /% (1000℃) |
1.0 |
1.1 |
1.01 |
1.03 |
1.05 |
1.05 |
Thermal shock resistance (1100℃-Water cold) |
≥3 |
≥4 |
≥4 |
≥4 |
≥4 |
≥4 |
Magnesium chrome brick packing
Products are packed on wooden pallet and then polyethylene film is placed over it, finally the package is tied up with steel strips.
Magnesium chrome brick minimum order
20 t is our minimum order but more then 2000 t can be supplied per month
Magnesium chrome brick delivery time
The products can be delivered within 35 days after receiving L/C at sight. |