| Item |
Magnesium Iron Spinel Brick |
Chemical Composition
|
Mgo
|
87-91 |
| Fe2o3 |
4-6 |
| Bulk Density |
g/cm3 |
3.0 |
| Apparent Porosity |
% |
16 |
| Cold crushing strength |
Mpa |
60 |
| Refractoriness under load |
℃ |
1650 |
Thermal expansion percent |
% |
400℃
|
0.4 |
| 800℃ |
0.9 |
| 1200℃ |
1.5 |
Thermal conductivity |
W/m.k |
300℃
|
3.7 |
700℃
|
3.0 |
| 1000℃ |
2.8 |
| Thermal shock resistance(time)950 |
℃ |
100 |
Magnesium Iron Spinel Brick Application
Magnesium iron spinel refractory brick has the excellent kiln skin properties of dolomite brick and magnesia chrome brick, the magnesia iron spinel brick has high refractoriness and strong anti-oxidation and reduction and mechanical stress functions. The mechanical and thermochemical properties of the product. There are significant improvements. Magnesium iron spine firebrick has been widely used in firing belts and upper transition belts in the cement rotary kiln, becoming a new variety to replace magnesia chrome bricks in conventional raw fuel production lines.
Magnesium Iron Spinel Brick Feature Reason
1.Magnesium Iron Spinel Refractory Brick have Good Corrosion Resistance
Magnesium iron spinel brick reacts with iron oxide, iron spinel and aluminum spinel to form uneven pores and fine crack structures locally, forming a highly direct bond structure between crystals.
MgO and The Al2O3, Fe2O3 or FeO of the magnesium iron spinel reacts more easily, forming a mutual diffusion phenomenon, which simultaneously forms a secondary spinel and forms a high Fe content around the iron-aluminum spinel particles. The dense layer, the formation of secondary spinel after sintering also enhances the compactness of the magnesium iron refractory spinel brick.
The direct bond between the magnesia and the chemical stability of the iron spinel is the magnesium iron spinel composite tip. The spar brick has a strong resistance to silicate melt penetration and resistance to salt and alkali corrosion. During the production and use of the refractory spinel brick, the produced spinel has good corrosion resistance, and the liquid phase in the cement clinker is mainly C4AF and C3A. In the cement production process, the clinker first penetrates into the interior of the brick, mainly C4AF. At the same time, when the liquid phase in the clinker enters the surface of the brick, the reaction between the liquid phase and the chemical composition of the brick first forms a high-temperature refractory layer, which prevents further penetration of the liquid phase and improves the resistance to clinker erosion.
2.Refractory Magnesium Iron Spinel Brick Have Good Performance of Hanging Kiln Skin
The process of forming the kiln skin is that when the kiln temperature reaches a certain value, the kiln material melts and reacts with the refractory magnesium iron spine brick surface, penetrates into the brick through the pores of the brick, the infiltrated material enters the brick to be solidified at a position lower than 1200 ℃. Produces a "mechanical anchoring" effect, which is the initial stage of the kiln skin. On this basis, the first layer of kiln skin is then bonded to the clinker granules, the kiln skin is gradually thickened. When the kiln skin is thickened to a certain value, the dynamic equilibrium is terminated and thickened to form a kiln skin. When the operation process of the kiln changes, especially when the kiln is stopped, the kiln skin will fall off when the gravity of the kiln skin is greater than the "anchor force" of the kiln skin on the brick, causing damage to the lining brick. Therefore, the "anchoring force" of the kiln skin on the lining brick has an important significance for the stability of the kiln skin. In order to make the kiln skin and the lining brick firmly bonded, in addition to the chemical composition of the refractory brick, the structure of the brick is also very important. There should be a certain amount of uniformly distributed pores to facilitate the infiltration of the kiln melt to form a mechanical anchor.
3.Magnesium Iron Spinel Brick Have Good Thermal Shock Resistance
The magnesium iron spinel refractory brick has the characteristics of small thermal expansion coefficient and high thermal conductivity, which can significantly reduce the thermal stress of the refractory magnesium iron spinel brick. The magnesia aluminum composite spinel brick contains various phases such as periclase, iron-aluminum spinel, magnesium iron spinel, magnesium-aluminum spinel. Due to different thermal expansion coefficients of various phases, in firing During the process, a large number of microcracks are present inside the material, thereby increasing the toughness of the material. Therefore, the magnesia alumina spinel brick has good flexibility and thermal shock resistance.
4.Magnesium Iron Spinel Brick Have Lower Thermal Conductivity
The kiln lining bricks of the cement kiln are single layer structure. The long term high temperature of the kiln cylinder is easy to cause deformation of the cylinder, affecting the operation of the kiln and reducing the cement output. Therefore, magnesium iron spinel brick is required to reduce the thermal conductivity of the kiln lining as much as possible. Compared with the direct combination of magnesia chrome bricks, the magnesia iron spinel brick reduces the thermal conductivity of the kiln lining material, reduces the surface temperature of the cylinder, reduces heat loss, correspondingly reduces fuel consumption, in order to improve cement. The operating rate of the kiln and the improvement of the service life have created favorable conditions.
❉The magnesium iron spine refractory bricks anti-erosion performance is good, and there is no phenomenon of alkali cracking and looseness in use.
❉The Refractory magnesium iron spinel bricks kiln skin is formed quickly, the kiln skin is stable and does not fall off.
❉Magnesium iron spinel bricks have good thermal shock resistance can improve the resistance to temperature fluctuations of cement kiln.
❉The thermal conductivity of the magnesium iron spinel brick is small, the surface temperature of the rotary kiln cylinder is lowered, and the energy saving effect is remarkable.
Why to Choose RS Refractory as a Magnesium Iron Spinel Brick Manufacturer
❉Now the magnesium iron spinel brick produced by Zhengzhou Rongsheng Refractory factory has been widely used in nearly 100 cement enterprises at home and abroad. The application of magnesium iron spinel brick in various cement enterprises: magnesium iron spinel brick performance is excellent . magnesium iron spinel fire brick exceeds the level of the existing direct combination of magnesia chrome brick, which can be used instead of directly combining magnesia chrome brick. can completely realize the chromium-free material of the cement kiln firing zone.
❉Rongsheng Refractory factory Specializing in the production of refractory bricks for nearly 20 years, now has formed a comprehensive enterprise for the production of refractory materials for the metallurgy, building materials, power, and chemical industries.
❉Rongsheng Refractory factory can provide specification and category as well as competitive price & high grade quality magnesium iron spinel bricks products. Fireproof magnesium iron spinel bricks size can be customized according to customer requirements.
