Alumina Magnesia Spinel Brick Introduction
Alumina magnesia spinel brick refers to the spinel refractory products synthesized by taking magnesium oxide and alumina as raw materials. The raw material is rarely found in nature, and the industrial aluminum magnesium spinel is all synthetic. Bauxite based sintered alumina magnesia spinel is made of high-quality bauxite with Al2O3 content of more than 76% and high-quality light burned magnesium powder with MgO content of more than 95%. After multistage homogenization process, it is sintered at a high temperature of more than 1800 ° C in an ultra-high temperature tunnel kiln.
Alumina Magnesia Spinel Brick Characteristics
Alumina magnesia spinel brick is a kind of magnesium brick with alumina as the main mineral in order to improve the thermal stability of magnesium brick.The advantage of alumina magnesia spinel brick is good thermal stability. It will react with clinker in the process of use, and then form a very thin calcium aluminate protective layer on the surface of the brick, so that the liquid is not easy to penetrate, and its anti peeling performance is better than that of directly combined magnesia chrome brick.When used in the cooling zone and transition zone of kiln, the service life can be doubled than that of directly bonded magnesium chromium brick. However, in terms of corrosion resistance, it is slightly inferior to directly bonded magnesia chrome brick.At the same time, sintered spinel brick is easy to hydrate, resulting in large coefficient, and the temperature of kiln carcass is higher than that when directly combined with magnesium chromium brick. Pay attention to these problems when using.
Alumina Magnesia Spinel Brick Application
Alumina magnesia spinel brick has high melting point, small thermal expansion, low thermal stress, good thermal shock stability, stable chemical properties and strong resistance to alkaline slag.The application of alumina magnesia spinel brick is mainly reflected in the following two aspects:First, aluminum spinel brick is used in cement rotary kiln instead of magnesia chrome sand as raw material, which not only avoids chromium pollution, but also has good peeling resistance;Second, it is used to make ladle castable, which greatly improves the corrosion resistance of steel plate lining. It is widely used as refractory for steelmaking. The preparation of high-quality pre synthetic spinel provides a new raw material for the production of amorphous and shaped high-purity refractories.
