Magnesia Chrome Brick in Rongsheng Kiln Refractory Company is refractory brick composed of magnesium oxide and chromium oxide, choosing magnesite and spinel as the main raw materials. Magnesia chrome brick is mainly used in metallurgy, building open-hearth furnace, electric furnace roof, refining furnace and various non-ferrous metal smelting furnace. There are high quality magnesia chrome brick, direct-bonded magnesia-chrome brick, rebonded magnesia-chrome brick and unfired magnesite-chrome brick in Rongsheng Refractory Company. If you want to buy cheap magnesia chrome brick, Email Rongsheng Kiln Company to get the quote!
Definition Of Magnesia Chrome Brick
Magnesia chrome brick, also called silicate bonded magnesia chrome brick, is made of sintered magnesia clinker and refractory chrome brick. The refractory grains are bound by silicate. The chromium oxide content of chrome ore used for producing magnesia chrome bricks is generally over 33%.
Magnesia chrome brick is different form chrome-magnesite brick due to the content of MgO and Cr2O3. Magnesia chrome brick: 55%≤MgO＜80% 30%≤Cr2O3＜45% CaO≤1.5%
Chrome-magnesite brick: 25%≤MgO＜55%
Properties Of Magnesia Chrome Brick
- Refractoriness is above 2000℃.
- Refractoriness under load(URL) is over 1550℃.
- Good volume stability at high temperature.
- Good resistance to extreme cold and extreme hot.
- Good thermal stability.
- Strong alkali slag resistance.
Applications Of Magnesia Chrome Brick
The production process of magnesia chrome brick is simple and the price is low. The magnesia chrome brick is commonly applied in cement rotary kiln, lime kiln, open hearth furnace, external refining furnace, non-ferrous metallurgy furnace, metal mixer furnace, glass kiln heat storage room, electric furnace roof, refining ladle permanent layer, refractory kiln lining, steel-making lining etc.
Ingredients Of Magnesia Chrome Brick
- Magnesite clinker
- Sintered magnesia
- Fused magnesia
- Chrome ore
- Synthetic magnesia chromite clinker
- Addictive agent
Classifications Of Magnesia Chrome Brick
- Magnesia chrome brick can be divided into the following five categories.
- Common magnesite-chrome brick
- Direct-bonded magnesia chrome brick
- Fused-rebonded magnesite-chrome brick
- Chemically bonded magnesium brick
- Fused cast magnesite chrome brick
Common Magnesite-chrome Brick
In common magnesite-chrome brick, the MgO content is more than 55%, but less than 80%, while the Cr2O3 content is no less than 8%. The main minerals in common magnesite-chrome brick are periclase and picotite, and the silicate phase is forsterite and calcium magnesium olivine.
Silicate matrix in alkaline brick has the lowest melting point and can be easily eroded. All kinds of slag may react with it, which has the great influence on the performance of magnesia chrome brick. The way to improve magnesia chrome brick quality is to adopt compact and dense coarse-grained chromite with little calcium oxide in order to avoid external expansion. The other way is to reduce the low melting point of silicate brick, such as silicate manganolite and calcium and magnesium olivine to adjust the matrix and form a high melting point forsterite, increasing the density of the bricks and reducing the infiltration of slag.
The ability of alkaline slag resistance of common magnesite-chrome brick is strong and the resistance to acid slag is better than that of magnesia brick. The load softening point of magnesia-chrome is high, the volume stability is good at high temperature and the shrinkage of the refired line at 1500℃ is small. The common magnesia-chrome brick is widely used in the firing zone of the rotary kiln.
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Direct-bonded Magnesia Chrome Brick
Direct-bonded magnesia chrome brick is a high quality magnesia chrome refractory developed in order to enlarge the large-scale production of cement. The primary minerals of direct-bonded magnesia chrome bricks are calcite and spinel combined directly which greatly improves the high temperature performance of refractory bricks.
The direct-bonded magnesia chrome brick is made of high quality magnesite ore and chromite as raw material and then fired into light magnesia. After a certain gradation, the magnesia chrome ball is formed by high pressure. The heavy magnesia is made at the temperature of 1900℃ and is pressed into mold after the adding of a certain proportion of ferrochrome. Finally, the direct-bonded magnesia chrome is calcined at 1750-1850 in a tunnel kiln. Compared with the common magnesia chrome brick, the life service of direct-bonded magnesia chrome brick is significantly improved.
The bricks fired at 1750-1850℃ are high temperature magnesia chrome bricks, while the bricks burned at 1800-1850℃ are ultra-high temperature magnesia chrome bricks and the key points of production are high purity raw materials, high pressure molding and high temperature calcination.
Fused-rebonded Magnesite-chrome Brick
Fused-rebonded magnesite-chrome brick is sintered from fused magnesia chrome sand. The agglutinating performance of fused magnesia chrome sand is poor but the calcinated product is a fine matrix with uniform pore distribution, and has tiny cracks. The sensitivity to temperature change is better than that of cast brick.
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Chemically Bonded Magnesium Brick
Chemically bonded magnesium brick is also called unfired magnesite-chrome brick, made of sintered magnesia, chromite and a small amount of chemical binder and heated at lower temperature to get hardened. Some products can be hardened at normal atmospheric temperature, and some must be heated to the appropriate temperature to make the products have certain strength. When the product is used at high temperature, ceramic bonding or high temperature resistant phase will be formed. Since the forming process is often wrapped in iron shell, chemically bonded magnesium brick is dubbed as iron sheet brick.
Fused Cast Magnesite Chrome Brick
Fused cast magnesia chrome brick is refractory product made of magnesia and chromite by electrical melting and casting, with the characteristics of large and isolated pores, high strength, good corrosion resistance and sensitivity to temperature changes.
Index Of Magnesia Chrome Brick
|0.2MPa URL ℃
|Apparent porosity %
|Cold crushing strength MPa
Supplier Of Magnesia Chrome Brick
Rongsheng Kiln Refractory Company is a leading supplier of magnesia chrome brick which can provide you various kinds of high quality magnesia chrome brick with the relatively low price. Are you a magnesia chrome buyer? Do you want to buy cheap magnesia chrome brick? Do you want to buy high quality magnesia chrome brick? Email Rongsheng Refractory Company for the best price! Quote RS Refractory Supplier now!