Alkaline refractories mainly refer to refractories with magnesium oxide and calcium oxide as the main components, which have strong corrosion resistance to alkaline slag. It includes magnesia brick, magnesia alumina brick, magnesia chrome brick, dolomite brick, etc.

Magnesia brick is commonly used. The magnesia brick containing more than 80% - 85% MgO has good resistance to alkaline slag and iron slag, and its fire resistance is higher than that of clay brick and silica brick. It is mainly used in open hearth furnace, oxygen blowing converter, electric furnace, nonferrous metal smelting equipment and some high temperature equipment.

Characteristics of basic refractories

Inorganic nonmetallic materials with fire resistance higher than 1580 ℃. Refractoriness refers to the centigrade temperature at which refractory cone specimen can resist high temperature without softening and melting without load. Refractory materials and high-temperature technology appeared together, roughly originated in the middle of the bronze age. In the Eastern Han Dynasty, clay refractory was used as kiln material and sagger for porcelain firing. At the beginning of the 20th century, refractories developed towards high purity, high density and ultra-high temperature products. At the same time, amorphous refractories and refractory fibers with little energy consumption appeared. In modern times, with the development of atomic energy technology, space technology and new energy technology, refractories with high temperature resistance, corrosion resistance, thermal vibration resistance and erosion resistance have been applied.