Magnesium-aluminum refractory is a refractory material made of magnesia (magnesium oxide) and bauxite (aluminum oxide) as the main raw materials, which is widely used in high-temperature industrial fields. Due to its unique chemical composition and remarkable physical properties, this material has irreplaceable advantages in many high-temperature environments.
Magnesium aluminum refractory products
The ladle is an indispensable and important equipment in the steelmaking industry. As the refractory material of the ladle lining, it has undergone several major changes. In the past, traditional sintered clay bricks and third-grade high-alumina bricks were used. This refractory material showed poor spalling resistance and erosion resistance during use and had a low service life, an average of only 10 times, and only about 20 times after treatment.
The excellent properties of magnesia products combined with spinel (magnesia-alumina spinel), such as slag resistance, spalling resistance, and creep resistance, have long been known to people. Use shows that the developed magnesia-alumina spinel unfired brick has a firing service life of more than 1 year in the active lime rotary kiln. For a long time, directly combined magnesia-chrome bricks have excellent slag resistance and erosion resistance and have been widely used in large alkaline rotary kilns. At present, the most widely used and used refractory material in the steel industry is magnesium-aluminum amorphous refractory, accounting for about 85% of the total production of amorphous refractory, and is widely used in converters, ladles, iron ladles, heating furnaces, and blast furnaces, almost all metallurgical thermal equipment.
Magnesium-aluminum spinel (MgO·Al2O3) has a high melting point, small thermal expansion, low thermal stress, and good thermal vibration stability, and at the same time, it has relatively stable chemical properties and strong resistance to alkaline slag. It is the core point for the use of aluminum-magnesium unfired bricks and one of the key materials to improve the service life. Due to the gradual maturity of the technology of artificial synthesis of magnesium-aluminum spinel in recent years, it is possible to directly produce ladle bricks using synthesized spinel materials, which can significantly improve its characteristics.
Application of magnesia alumina spinel bricks in cement rotary kiln
Magnesium-aluminum spinel bricks are widely used in the unstable kiln skin area at the tail of the cement rotary kiln firing zone. Its performance is mainly reflected in: good kiln skin performance, excellent thermal shock resistance and anti-stripping performance, and strong physical and chemical stability. Among various refractory bricks for cement rotary kilns, magnesium-aluminum spinel bricks are a relatively comprehensive refractory brick.
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