With the rapid development of the cement industry, the performance requirements for cement kilns are getting higher and higher. In order to improve the production efficiency, reduce energy consumption and reduce environmental pollution of cement kilns, the refractory materials of the firing zone, a key component of cement kilns, are also constantly improving and innovating. As a new type of refractory material, magnesium spinel zirconia brick has become an ideal choice for cement kiln firing belt because of its excellent performance.
1. Performance characteristics of magnesium spinel zirconia bricks.
High erosion resistance: Magnesium spinel zirconia bricks are mainly composed of magnesium aluminum spinel and zirconia, which has high erosion resistance. In the high-temperature environment of the cement kiln firing zone, magnesium spinel zirconia bricks are able to resist the erosion of clinker, fuel and molten matter, extending the service life of refractories.
High strength: Magnesium spinel zirconia bricks have high strength and can withstand the high temperature pressure and mechanical stress of the cement kiln firing zone, ensuring the stable operation of refractory materials.
Good thermal shock stability: Magnesium spinel zirconia bricks have good thermal shock stability, which can maintain stable performance in the case of rapid temperature changes, reducing the damage of refractory materials caused by temperature fluctuations.
Low porosity: The low porosity of magnesium spinel zirconia bricks is conducive to reducing heat loss and improving the thermal efficiency of cement kilns.
Good wear resistance: Magnesium spinel zirconia bricks have good wear resistance, which can reduce the wear of clinker and melt on refractory materials and prolong the service life of refractory materials.
2. Application of magnesium spinel zirconia bricks in cement kiln firing zone.
Improve the production efficiency of cement kiln: Because magnesium spinel zirconia bricks have high erosion resistance, high strength and good wear resistance, they can withstand the high temperature pressure and mechanical stress of the cement kiln firing belt, which ensures the stable operation of refractory materials, thereby improving the production efficiency of cement kilns.
Reduced energy consumption: The low porosity of magnesium spinel zirconia bricks is conducive to reducing heat loss and improving the thermal efficiency of cement kilns, thereby reducing energy consumption in cement production.
Reduce environmental pollution: Magnesium spinel zirconia bricks have high erosion resistance, can resist the erosion of clinker, fuel and melt, reduce the emission of toxic and harmful substances, and reduce environmental pollution.
Extend the service life of refractories: Because magnesium spinel zirconia bricks have good thermal shock stability and wear resistance, they can reduce the wear of clinker and melt on refractories, prolong the service life of refractories, and reduce production costs.
3. Application prospect of magnesium spinel zirconia bricks in cement kiln firing zone.
With the increasing requirements of the cement industry for environmental protection and energy saving, magnesium spinel zirconia brick, as a new type of refractory material, has a very broad application prospect in the firing zone of cement kiln. First of all, magnesium spinel zirconia bricks have excellent properties and can meet the various requirements of the cement kiln firing beltSecondly, the ** of magnesium spinel zirconia brick is relatively low, which can reduce the cost of cement production;Finally, the production process of magnesium spinel zirconia bricks has matured, which is conducive to large-scale production and application.
In a word, magnesium spinel zirconia brick, as a new type of refractory material, has a wide application prospect in the firing zone of cement kiln. By using magnesium spinel zirconia bricks, the production efficiency of cement kilns can be improved, energy consumption can be reduced, environmental pollution can be reduced, and contribute to the sustainable development of the cement industry.
An important disadvantage of magnesium spinel zirconia bricks compared to magnesia-chrome bricks is that they are not resistant to the erosion of alkaline media. In the kiln firing zone temperature of about 1500, much higher than the transition zone (about 200), the cement clinker containing CAO reacts with spinel, resulting in the formation of low melting point aluminate;In the secondary refining of steel, such as the rh furnace impregnating pipe, it is subject to the erosion of high alkalinity slag from the end of the converter, resulting in premature erosion of spinel bricks.
Physical and chemical indexes of magnesium spinel zirconia bricks.
As a countermeasure, one is to add fused magnesia to the ingredients;The second is to add corundum powder or AAL2O3 to the fine powder, and the third is to add ZRO2. The addition of fused magnesia improves the density, strength and corrosion resistance of the productsThe addition of corundum powder or AA2O3 generates an appropriate amount of in-situ spinel in the matrix to create the matrix structureThe addition of ZRO2 is not only conducive to improving the thermal shock resistance of the product, but also reacts with CAO first, generating high melting point (2320) calcium zircon acid CaO·ZO2, which can effectively prevent the penetration of alkaline medium into the product and protect the spinel from decomposition.
Magnesium spinel zirconia bricks have achieved good performance in the firing zone of cement kilns, and the trial of RH vacuum degassing furnaces also has good prospects. A, C, QMJG12X are bricks for firing in cement kiln;Others are used in RH furnaces.