The magnesia content of magnesia brick is more than 90%, and the main crystal phase is periclase

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 bonded magnesia brick due to the direct contact of periclase grains; the brick made from fused magnesia is called electrofusion reconstituted magnesia brick.

Magnesia brick has high refractoriness, good slag resistance, high softening temperature under load, but poor thermal shock resistance. Fired magnesia brick is made of magnesia brick as raw material. After crushing, proportioning, mixing and molding, it is fired at 1550-1600 ℃, and the firing temperature of high-purity products is above 1750 ℃. Unburned magnesia brick is made by mixing, molding and drying with appropriate chemical binder in magnesia.

The main raw material of fired magnesia brick is high quality sintered magnesia, and pulp is used as binder. After mixing and high pressure molding, it is fired in a high temperature tunnel kiln above 1550 ℃. It has good thermal stability, corrosion resistance and spalling resistance. It is widely used as lining refractory for converter, electric arc furnace and other industrial furnaces.

The fused magnesia brick has the advantages of compact structure, high mechanical strength and low impurity content. It is mainly used for heat storage in large glass kilns

High temperature area of the chamber. Fused magnesia is a kind of fused magnesia, which is made of high quality magnesia by melting. Magnesium is extracted from magnesite or water by calcination. It has strong hydration resistance.