Magnesia chrome bricks are divided into ordinary magnesia chrome bricks, direct-bonded magnesia chrome bricks, semi-bonded magnesia chrome bricks, fused magnesia chrome bricks, fused semi-bonded magnesia chrome bricks, and unfired magnesia chrome bricks. The difference between magnesia chrome bricks and direct-bonded magnesia chrome bricks lies in: 1. the purity of magnesite (raw material); 2. the sintering temperature. The sintering temperature of ordinary magnesia chrome bricks is between 1550°C and 1600°C, while the sintering temperature of direct-bonded magnesia chrome bricks is above 1700°C. When the temperature exceeds 1700°C, the microstructure of magnesia chrome bricks changes, with periclase directly bonding with chromite, hence termed as direct-bonded magnesia chrome bricks. Direct-bonded magnesia chrome bricks perform better in all aspects compared to ordinary magnesia chrome bricks.
Sintered magnesia bricks are made primarily from high-quality sintered magnesite sand as the main raw material, with pulp as the binder. After mixing and high-pressure forming, they are sintered in tunnel kilns at temperatures above 1550°C. They exhibit good thermal stability, erosion resistance, and spalling resistance. Widely used as refractory linings for industrial kilns such as converters and electric arc furnaces.
Fused magnesia bricks have a dense brick structure, high mechanical strength, low impurity content, and are mainly used in the high-temperature areas of large glass kiln regenerators.
Magnesia brick is an alkaline refractory material with a magnesium oxide content of over 90%, mainly composed of periclase as the primary crystal phase. It can generally be divided into sintered magnesia bricks (also known as fired magnesia bricks) and chemically bonded magnesia bricks (also known as unfired magnesia bricks). Magnesia bricks with high purity and sintering temperature have periclase grains directly in contact, known as direct-bonded magnesia bricks; bricks made from fused magnesia sand are called fused re-bonded magnesia bricks.
Magnesia bricks have high refractoriness, excellent resistance to alkali slag, and a high starting temperature for load softening but poor thermal shock resistance. Sintered magnesia bricks are made from sintered magnesite sand as the main raw material, crushed, mixed, formed, and then sintered at temperatures between 1550°C and 1600°C, with the sintering temperature of high-purity products being above 1750°C. Unfired magnesia bricks involve adding appropriate chemical binders to magnesia sand, mixing, forming, and drying.
Sintered magnesia bricks are made primarily from high-quality sintered magnesite sand as the main raw material, with pulp as the binder. After mixing and high-pressure forming, they are sintered in tunnel kilns at temperatures above 1550°C. They exhibit good thermal stability, erosion resistance, and spalling resistance. Widely used as refractory linings for industrial kilns such as converters and electric arc furnaces.
Fused magnesia bricks have a dense brick structure, high mechanical strength, low impurity content, and are mainly used in the high-temperature areas of large glass kiln regenerators. Fused magnesia sand is made from high-quality magnesite sand melted down, also known as fused magnesite. It is obtained by high-temperature calcination of magnesite or magnesium hydroxide extracted from seawater. It has strong resistance to hydration.
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