Magnesium brick is an alkaline refractory with magnesia content over 90% and periclase as the main crystalline phase. The sales of regenerative bricks can generally be divided into two categories: sintered magnesia bricks (also known as fired magnesia bricks) and chemically bonded magnesia bricks (also known as unburned magnesia bricks). Magnesium-chrome bricks with high purity and firing temperature are called directly bonded magnesia bricks because of the direct contact of periclase grains. The bricks made from electrofused magnesia sand are called electrofused combined magnesia bricks, which are suitable for various rotary kilns, sleeve kilns, shaft kilns and other large and medium-sized lime kilns. Magnesium bricks have the advantages of strong alkali resistance, strong scouring resistance, good thermal stability, high compressive strength and high load softening temperature. The sintered magnesia brick is made of high quality sintered magnesia as the main raw material and pulp as the binder. After mixing and high pressure forming, it is fired in a high temperature tunnel kiln above 1550 C. It has good thermal stability, corrosion resistance and spalling resistance. It is widely used in industrial kilns such as converters and electric arc furnaces as lining refractories.
The fused magnesia brick has compact structure and high mechanical strength.
The advantages of low impurity content are mainly used for the heat-storage compact refractory bricks of large glass kilns, which have certain shape and size of refractory materials. The unit volume weight and density are large, indicating good compactness and high strength. It is also called the beginning deformation temperature of high-temperature load, which is called the change of reburning line or residual line. It refers to the change of volume expansion and shrinkage in the same temperature change each time. High temperature, 1800 degrees, load softening temperature 1620-1640, thermal expansion coefficient is small.
Dense refractory brick is a kind of siliceous clay rich in hydrated aluminium silicate, which is not deformed and fragmented at high temperature.
The ability of non-softening and non-pasting, refractory bricks are consumed in amorphous material sector. The basic quality requirements are that alumina content is higher than 38% and low iron and alkali metal content. These products can not be calcined or calcined, such as refractory clay, overload plastics, high alumina plastics, refractory clay and high alumina castables.
Unburned alumina-ma-gnesia brick for ladle is an unburned refractory product made from bauxite clinker and Ma gnesia for lining brick of ladle. With the development of new steelmaking technologies such as converter oxygen blowing, continuous casting and refining outside the furnace, the increase of molten steel temperature and the prolongation of residence time in ladle make the service conditions of ladle lining harsh, which results in serious erosion of clay lining bricks. The unburned alumina-ma-gnesia brick for ladle with better service effect means that the ladle is ripe from bauxite. An unburned refractory product made of magnesia and material for lining bricks of ladles. With the development of new steelmaking technologies such as converter oxygen blowing, continuous casting and refining outside the furnace, the increase of molten steel temperature and the prolongation of residence time in ladle make the service conditions of ladle lining harsh, which results in serious erosion of clay lining brick, and the use of this kind of lining brick has better effect.