Brief Introduction
Magnesia Chrome Brick is a kind of basic refractory material with more than 90% magnesium oxide content and periclase as the main crystal phase, which has excellent properties of high refractoriness, high temperature strength, good thermal shock resistance and strong basic slag erosion resistance and is mainly used for steelmaking basic open-hearth furnace, electric furnace bottom and wall, permanent lining of oxygen converter, non-ferrous metal metallurgy furnace, high-temperature tunnel kiln, lining of rotary kiln, furnace bottom and wall of heating furnace, regenerative chamber of glass furnace and etc.
For the Magnesia Chrome Brick, the maximum allowed environment temperature is 1700℃. It has features of high strength, high refractoriness under load, high alkali erosion resistance and high thermal shock resistance under the load conditions of 1500~1650℃ and also have big advantages of environmental protection and long service life. 
Technical Datas
|
Item |
Commom Magnesia Chrome Brick |
Direct-Bonded Magnesia Chrome Brick |
||||||
|
MgO % |
80 |
72 |
70 |
65 |
85 |
77 |
74 |
69 |
|
Cr2O3 % |
7 |
10 |
13 |
17 |
5.5 |
9.1 |
14 |
18 |
|
CaO % |
1.2 |
1.2 |
1.2 |
1.2 |
1.1 |
1.4 |
1.2 |
1.2 |
|
SiO2 % |
3.4 |
4 |
4 |
4.2 |
1.3 |
1.2 |
1.2 |
1.5 |
|
Al2O3 % |
4.5 |
6.5 |
6 |
6 |
3.5 |
4 |
3.5 |
4.5 |
|
Fe2O3 % |
4 |
4.8 |
5.5 |
6.5 |
3 |
6.4 |
5 |
5.7 |
|
Apparent Porosity % |
17 |
18 |
18 |
18 |
18 |
18 |
18 |
18 |
|
Bulk Density g/cm3 |
3 |
3 |
3.02 |
3.05 |
3.02 |
3.04 |
3.06 |
3.08 |
|
Cold Crushing Strength Mpa |
55 |
55 |
55 |
50 |
50 |
50 |
55 |
55 |
|
Refractoriness Under Load °C |
1600 |
1600 |
1600 |
1600 |
1700 |
1700 |
1700 |
1700 |
|
Thermal expansion % 1000°C |
/ |
/ |
/ |
/ |
1 |
1 |
1 |
0.9 |
|
Thermal expansion % 1600°C |
/ |
/ |
/ |
/ |
1.8 |
1.8 |
1.8 |
1.6 |
|
Item |
Fused Semi-rebond Magnesia Chrome Brick |
Fused Rebonded Magnesia Chrome Brick |
|||||
|
MgO % |
68 |
64 |
65 |
56 |
56 |
75 |
75 |
|
Cr2O3 % |
16 |
18 |
20 |
22 |
26 |
12 |
14 |
|
SiO2 % |
1.5 |
1.5 |
1 |
2.5 |
2.5 |
1.5 |
1.5 |
|
Apparent Porosity % |
16 |
16 |
14 |
16 |
16 |
15 |
15 |
|
Bulk Density g/cm3 |
3.1 |
3.1 |
3.1 |
3.1 |
3.1 |
3.2 |
3.2 |
|
Cold Crushing Strength Mpa |
40 |
40 |
40 |
40 |
40 |
50 |
50 |
|
Refractoriness Under Load °C |
1700 |
1700 |
1700 |
1700 |
1700 |
1700 |
1700 |
Application
1. Magnesia Chrome Brick is mainly used in metallurgical industry, such as for building open-hearth furnace top, electric furnace top, finery out of furnace and all kinds of non-ferrous metal metallurgy furnace.
2. Fused cast magnesite chrome brick is adopted for high temperature position of furnace wall in electric furnace with ultra high power.
3. Magnesia chrome brick that made of synthetic compost is adopted for strong erosion area in finery out of furnace.
4. Fused cast magnesite chrome brick or magnesia chrome brick that made of synthetic compost is adopted for strong erosion area of nonferrous metals flash smelting furnace.
5. Besides, Magnesia Chrome Brick also can be used for burning zone in rotary cement kiln and regenerative chamber in glass furnace.
