Magnesia brick is an alkaline refractory with magnesia content of more than 90% and magnesia as the main crystal phase. Generally, it can be divided into sintered magnesia brick (also known as fired magnesia brick) and chemically bonded magnesia brick (also known as unburned magnesia brick). The magnesia brick with high purity and high firing temperature is called direct combined magnesia brick because of the direct contact of periclase grains; the brick made of fused magnesia is called electric combined magnesia brick, which is suitable for various rotary kilns, sleeve kilns, shaft kilns and other large and medium lime kilns. Magnesia brick has the advantages of strong alkaline erosion resistance, strong erosion resistance, good thermal stability, high compressive strength and high load softening temperature. High quality sintered magnesia is used as the main raw material for firing magnesia brick, and pulp is used as the binder. After mixing and high pressure forming, it is fired in a high temperature tunnel kiln above 1550 ℃. It has good thermal stability, erosion resistance and peeling resistance. It is widely used in converter, electric arc furnace and other industrial furnaces as lining refractories.

Electric fused magnesia brick has the advantages of compact brick structure, high mechanical strength and low impurity content. It is mainly used in large-scale glass kilns. It has certain shape and size of refractory materials, unit volume weight and high density, indicating that the compactness is good, and the strength may be high, which is also called high temperature load starting deformation temperature, which is called reburning line change or residual line change, which means that each time at the same time In the same temperature change, the volume expands and contracts. It is high temperature resistant, 1800 ℃, load softening temperature is 1620-1640, and the coefficient of thermal expansion is small.

Dense refractory brick is a kind of siliceous clay rich in hydrated aluminum silicate, which has no deformation and fragmentation under high temperature

The ability of no softening and no paste. In the amorphous materials sector, there are a variety of products for consumption. The basic quality requirements are that alumina is higher than 38% and the content of low iron and low alkali metal. These products can not be calcined or calcined, such as refractory clay, plastic material for overload, high alumina plastic, refractory clay and high alumina castable.

Unburned alumina Ma gnesia brick for ladle refers to unburned refractory products made from bauxite clinker and magnesia for ladle lining brick. With the development of new steelmaking technologies such as converter oxygen blowing, continuous casting and refining, the increase of molten steel temperature and the extension of residence time in the ladle, the service conditions of the ladle lining are harsh, resulting in serious erosion of clay lining brick, and the use of this lining brick has a good effect of unburned alumina Ma gnesia brick for the ladle Ladle) refers to unburned refractory products made of bauxite clinker and magnesia for lining bricks of steel drums. With the development of new steelmaking technologies, such as converter oxygen blowing, continuous casting and external refining, the increase of molten steel temperature and the prolongation of residence time in the ladle, the service conditions of the ladle lining are harsh, resulting in serious erosion of clay lining brick, which has better service effect