The microstructure of magnesia bricks is actually a combination of magnesia microstructures. The microstructure of magnesia bricks produced using one raw material is the simplest. A magnesia brick made British seawater magnesia, with the exception of pores in the matrix, there is almost no silicate. The intra- intergranular micropores of periclase are characteristic structural parameters. The production of magnesia bricks mainly depends on the sintering effect of the liquid phase in the magnesia fine powder matrix to achieve the bonding between the particles. Therefore, the raw materials with high purity are difficult to sinter. Sintering at a temperature above ℃. Bricks containing more silicate (CMS) can be sintered at 1500 ~ 1600 ° C. Therefore, common magnesium bricks are very dense, while seawater magnesium bricks are porous. However, it is reflected in the high temperature mechanical properties, but it shows the opposite result. For example, the softening temperature of seawater magnesia bricks is higher than 1700 ° C; sintered magnesia bricks are generally 1500 ~ 1600 ° C. Most high-purity magnesia bricks produced abroad use seawater magnesia seawater magnesia fused magnesia.

The magnesia raw material is crushed crushed into granules powders, after mixing according to a certain proportion, a binder is added to knead the mud, then calcined magnesia bricks are formed through processes such as molding, drying, firing. The firing temperature of ordinary magnesia brick is generally 1500 ~ 1650 ℃, the firing temperature of high-purity magnesia brick is as high as 1700 ~ 1900 ℃. The production process of chemically bonded magnesium bricks is basically the same, except that the use of chemical bonding agents does require high-temperature firing, only appropriate low-temperature heat treatment can be used to make non-fired magnesium bricks.