Product Details
Product Introduction
Magnesia-alumina bricks represent a key offering from Rongsheng Kiln Refractory Materials Co., Ltd., comprising three distinct varieties: ordinary magnesia-alumina bricks, magnesia-alumina spinel bricks, and modified magnesia-alumina spinel bricks. These bricks are primarily made from high-alumina bauxite clinker, sintered magnesia, and high-purity pre-synthesized magnesia-aluminum spinel. The generation of a magnesia-alumina spinel mineral phase within these bricks at elevated temperatures results in enhanced thermal expansion homogeneity and a reduced thermal expansion coefficient, thereby significantly boosting their thermal shock stability and thermomechanical characteristics. Ordinary magnesia-alumina bricks find extensive application in steel-making open-hearth furnaces, electric furnaces, glass kilns, tunnel kilns for firing refractory products, and shuttle kilns, among others. On the other hand, magnesia-alumina spinel bricks are particularly well-suited for high-temperature applications, including key areas of cement rotary kilns, lime kilns, glass kilns, and refining units outside the furnace, owing to their impressive corrosion resistance, oxidation-reduction stability, and high-temperature volume consistency. Modified magnesia-alumina spinel bricks were specifically engineered for the firing zone of cement rotary kilns, demonstrating marked improvements in resistance to alkali vapor and cement clinker liquid phase permeability, as well as enhanced capacity to withstand mechanical stress. This development addresses the shortcomings often observed in traditional magnesia-alumina bricks within the firing zones, such as tissue embrittlement and structural spalling typically seen in tape-forming applications. In summary, magnesia-alumina bricks exhibit a broad applicability across diverse high-temperature kiln environments, thanks to their stable chemical composition, versatile configurations, and outstanding performance, underscoring their quality and dependability in demanding high-temperature conditions.
Advantages and features
1. Superior thermal shock resistance: The magnesium-aluminum spinel mineral phase exhibits excellent thermal expansion uniformity and a minimal thermal expansion coefficient; 2. Outstanding volume stability at high temperatures: Magnesia-alumina spinel bricks retain a consistent volume structure even in elevated temperature settings; 3. Exceptional corrosion resistance: These bricks demonstrate formidable resistance to both oxidation and reduction; 4. High mechanical stress resistance: Enhanced magnesia-alumina spinel bricks significantly bolster their ability to withstand mechanical stresses, effectively preventing tissue embrittlement and structural spalling; 5. Consistent chemical composition: The use of premium raw materials, such as high-purity pre-synthesized magnesium-aluminum spinel, guarantees the reliability and stability of product performance.
Application Scenario
1. Ordinary magnesia-alumina bricks are ideal for high-temperature applications, including steelmaking open-hearth furnaces, electric furnaces, and tunnel kilns; 2. Magnesium-aluminum spinel bricks are especially suited for equipment where high temperature volume stability is crucial, like the transition zone of cement rotary kilns; 3. Modified magnesia-alumina spinel bricks are designed for use in equipment subjected to significant high temperature mechanical stress, such as the firing zone of cement rotary kilns.
