Magnesia Alumina Brick is made of high-quality sintered magnesia, with about 8% of pure Al2O3 fine powder or high-quality high alumina bauxite (Al2O3> 78%, SiO2 <20%, a small amount of Fe2O3 and other impurities)as raw materials, sulfite pulp waste liquid as a binder. And finally, an alkaline refractory brick, Magnesia Alumina Bricks are made by the processes of compounding, mixing, billeting, drying, firing, and the like.
Physical and Chemical Properties of Magnesia Alumina Brick
|MgO (%) ≥||80||80|
|Al2O3 (%) ≥||5 ~ 10||5 ~ 10|
|Apparent Porosity (%) ≤||18||20|
|Cold Crushing Strength (MPa) ≥||40||30|
|0.2 MPa Refractoriness Under Load (℃) ≥||1600||1580|
|Thermal Shock Resistance
(1100℃, water quenching, cycle) ≥
Magnesia Alumina Brick Properties
According to the physical and chemical indicators of Magnesia Alumina Bricks, we can analyze the main characteristics of the Magnesia Alumina Brick. As follows:
(1) The chemical composition of Magnesia Alumina Bricks.
The chemical composition varies with the raw materials, such as MgO>81%, Al2O3 8.7%, SiO2<6.0%, CaO<1.5%, and Fe2O3<1.0%.
(2) The mineral composition of Magnesia Alumina Bricks.
In its mineral composition, the main crystal is composed of periclase, and the matrix is composed of magnesium ferrite, forsterite, calcium forsterite and magnesia alumina spinel.
(3) The refractoriness and load softening temperature of Magnesia Alumina Bricks.
In Magnesia Alumina Bricks, the periclase crystal forms a network skeleton with the magnesia-alumina spinel. Although a small amount of low melting point impurities are filled in the interstices of the network backbone, the network backbone still has the ability to withstand high temperatures and loads. Therefore, the refractoriness and load softening temperature of the magnesia-alumina brick are relatively high, the refractoriness can reach 2100 ° C, and the load softening temperature is 1570 ° C.
(4) Thermal expansion and thermal stability of Magnesia Alumina Bricks.
Since the coefficient of linear expansion of the magnesia-alumina spinel is small, the coefficient of linear expansion of the magnesia-alumina brick is small. In the range of 20 to 1000 ° C, the coefficient of linear expansion of the magnesia-alumina brick is . Because the magnesia-alumina spinel acts to enhance the thermal shock resistance in the brick, the thermal shock resistance of the magnesium-aluminum brick is better, and the number of water cooling is more than 20 times.
(5) Slag resistance of magnesium aluminum brick.
Due to the high density and low porosity of the magnesia-aluminum brick. The periclase is surrounded by magnesia aluminate spinel. At the same time, Al2O3 is a typical neutral oxide, so the ability of magnesium-aluminum brick to resist acid and alkaline slag erosion is relatively strong.
RS Magnesia Alumina Brick Supplier
RS Kiln Refractory manufacturer provides customers with the price of Magnesia Alumina Brick. If you need to buy Magnesia Alumina Spinel Bricks, Magnesia Chrome Bricks, Sintered Magnesia Bricks, Magnesia Carbon Bricks, etc., please contact us, RS Magnesia Brick Supplier, and we will get back to you in the shortest time.
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