What is magnesia brick?
Magnesia brick is an alkaline refractory brick. The main crystal phase is periclase, which has the typical characteristics of general alkaline refractory products, but its thermal shock resistance is poor.
Magnesia bricks are mainly used in steelmaking alkaline open hearth furnace, electric furnace bottom and furnace wall, permanent lining of oxygen converter, non-ferrous metal smelting furnace, high temperature tunnel kiln, calcined magnesia brick and cement rotary kiln lining, furnace bottom and furnace of heating furnace Walls, glass kiln regenerator checker bricks, etc.
Generally, it can be divided into two categories: sintered magnesia bricks and chemically bonded magnesia bricks. Magnesia bricks with high purity and firing temperature are called directly bonded magnesia bricks because of the direct contact of periclase grains; bricks made of fused magnesia are called fused rebonded magnesia bricks.
Sintered magnesia bricks are made of magnesia bricks as raw materials. After crushing, batching, kneading and molding, they are fired at a high temperature of 1550~1600°C, and the firing temperature of high-purity products is above 1750°C.
Non-cast magnesia bricks are made by adding appropriate chemical binders to magnesia, kneading, molding and drying.