In JUL, HOT SALES, 6*20GP FCL containers of Magnesia Spinel Brick & Mortar & Closure Shims are packed for delivering to our customer in Kenya.
Mgo Alumina Spinel Refractory Brick has been widely used in refractory materials and other industrial fields for its high melting point, good thermal shock stability and resistance to slag erosion and a series of excellent properties. At present, the most common method for preparing magnesia-aluminum spinel is the solid-phase reaction synthesis method, that is, using oxides, oxychlorides or carbonates as raw materials, mixing the raw materials and then reacting at high temperature (greater than 1400 ℃) to prepare Spinel.
The electrofusion method is another commonly used method for synthesizing spinel in the industry, and this method also has disadvantages such as high energy consumption.
Although wet chemical methods such as sol-gel method and hydrothermal method can synthesize spinel at lower temperature, their operation process is complicated, the equipment required is expensive, and the cost is too high to meet the needs of large-scale industrial production. .
The Mgo Alumina Spinel Refractory Brick produced from magnesia and magnesia-alumina spinel sand is usually called magnesia-alumina (periclase-spinel brick). The magnesia raw material used for the production of periclase spinel bricks requires the lowest possible impurity content (especially CaO).
Domestic sintered magnesia MS95, MS97, MS97.5, DMS97 are commonly used. Spinel sand is used as granular material, magnesia sand is used as fine powder and some granular materials, and it is produced according to the mixing, forming and firing process of high-grade magnesia-alumina bricks, which can produce products with good high temperature performance and high thermal shock stability. .
Magnesia-alumina spinel refractory bricks are often used in cement rotary kilns, glass kiln lattices, iron mixing furnaces and refractory furnaces where the temperature varies greatly.
Now it has been widely used in the lining of cement rotary kilns to replace Mgo Alumina Spinel Refractory Bricks.
The microstructure characteristics of magnesia-aluminum spinel are relatively complex, mainly the combination of magnesia microstructure and iron-aluminum spinel microstructure. The mutual diffusion, close combination, to achieve the direct combination of materials.
The advantages of Mgo Alumina Spinel Refractory Bricks are:
1. Good thermal shock resistance, it will react with clinker during use, and then form a thin calcium aluminate protective layer on the surface of the brick. Make it difficult for liquids to penetrate.
2. Its anti-peeling performance is better than that of directly bonded magnesia-chrome bricks. The service life of the cooling zone and transition zone of the kiln can be doubled compared with the direct combination of magnesia-chrome bricks. However, it is slightly inferior to direct-bonded magnesia-chrome bricks in terms of corrosion resistance.
3. Sintered spinel bricks are easy to be hydrated, the thermal conductivity is large, and the temperature of the kiln body is higher than that when directly combined with magnesia-chrome bricks. Pay attention to these issues when using them.
The physical and chemical properties of magnesia-alumina spinel bricks are: small thermal expansion, good thermal shock stability, stable chemical properties, and strong resistance to alkaline slag.
