Magnesia Bricks

Magnesia bricks are alkaline refractory materials. These products have over 90% magnesium oxide content and adopt periclase as the principal crystalline phase. Many magnesia refractory products also contain silicate, spinel, or other ingredients. However, the properties of the main crystalline phase periclase and the behavior at high temperatures directly control the performance of the magnesia refractory.

Magnesia bricks have excellent performance of superior high-temperature mechanical strength and volume stability. Magnesia Brick is mainly used in basic open-hearth furnaces for steelmaking, electric furnace, rotary cement kiln, heating furnace, glass furnaces, and hyperthermia tunnel kilns with properties of higher refractoriness, good basic slag erosion resistance, and high apparent initial softening temperature. Magnesia Bricks can service at a high temperature of 1750℃. Magnesia Bricks are widely used in the permanent lining of steel furnaces, lime kilns, glass kilns, ferroalloy furnaces, mixers, non-ferrous metal smelting furnaces, etc. They are ideal construction materials for glass kiln applications.

Magnesia bricks can generally be divided into two categories: sintered magnesia bricks and chemically bonded magnesia bricks (also known as unfired magnesia bricks). Magnesia bricks with high purity and high firing temperature become directly bonded magnesia bricks due to direct contact with periclase grains. Bricks made with fused magnesia as raw materials are called fused combined magnesia bricks. Sintered magnesia bricks are sintered at a high temperature of 1550~1600℃ after crushing, batching, mixing, and forming. The sintering temperature of high-purity products is above 1750℃. Unburned magnesia bricks are made by adding the proper amount of chemical bonding agent to magnesia. It is made by mixing, molding, and drying.