The use of magnesia bricks is mainly used in steelmaking alkaline open-hearth furnace, electric furnace bottom, and furnace wall. The permanent lining of oxygen converter. Non-ferrous metal smelting furnace, high-temperature tunnel kiln, calcined magnesium brick, and cement rotary kiln lining. The bottom and wall of the heating furnace, the lattice brick of the regenerator of the glass kiln, etc. The advantages of using magnesia bricks can be perfectly reflected in these refractory linings. If you want to know more about the advantages of using magnesia bricks, you need to first understand magnesia bricks.
Definition of magnesia brick
Magnesia bricks are basic refractory materials with magnesium oxide content above 85% and cristobalite as the main crystal phase. Magnesia bricks are refractory bricks made of fused magnesia and sintered magnesia at high temperatures. Generally, it can be divided into two categories: sintered magnesia brick (also called fired magnesia brick) and chemically combined magnesia brick (also called unfired magnesia brick). Magnesia bricks with high purity and high firing temperature are called directly bonded magnesia bricks due to the direct contact of the periclase grains. Bricks made of fused magnesia as raw materials are called fused and combined magnesia bricks, and are suitable for large and medium-sized lime kilns such as various rotary kilns, sleeve kilns, and shaft kilns.
Magnesium brick characteristics
It has a high degree of refractoriness, good resistance to alkaline slag, high temperature at the beginning of load softening, but poor thermal shock resistance. Sintered magnesia bricks are made of magnesia bricks. After crushing, batching, kneading and molding, it is fired at a high temperature of 1550 to 1600°C, and the firing temperature of high-purity products is above 1750°C. Unburnt magnesia bricks are made by adding appropriate chemical binders to magnesia, mixed, shaped, and dried.
Magnesium bricks have the advantages of strong alkali resistance, strong erosion resistance, good thermal stability, high compressive strength, and high load softening temperature. The fired magnesia brick uses high-quality sintered magnesia as the main raw material and uses pulp as the binding agent. After mixing and high-pressure molding, it is fired in a high-temperature tunnel kiln above 1550℃. Has good thermal stability, anti-erosion, and anti-stripping properties. It is widely used as lining refractories in industrial furnaces such as converters and electric arc furnaces.
The advantages of using magnesia bricks
Unburned alumina magnesia brick for ladle refers to non-fired refractory products made of high-alumina bauxite clinker and magnesia for lining bricks in the steel drum. With the development of new steelmaking technologies such as oxygen blowing in the converter, continuous casting, and refining outside the furnace, the temperature of the molten steel increases, and the residence time in the steel drum increases. The use conditions of the inner lining of the steel drum are harsh, which causes serious erosion of the clay brick. The use of this kind of lining brick has a better use effect.
The fused magnesia brick has the advantages of the dense brick structure, high mechanical strength, and low impurity content. Mainly used for heat storage of large glass kiln. Dense refractory bricks have certain shapes and sizes of refractory materials, with unit volume weight and high density. Dense refractory brick is a kind of siliceous clay rich in hydrated aluminum silicate. It has the ability to not deform, crack, soften or paste at high temperature. The basic quality requirements of refractory bricks are higher than 38% alumina and low iron and low alkali metal content. These products may not be calcined or calcined, such as refractory clay, plastic materials for overload, high alumina plastics, refractory clay and high alumina castables.
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