"Alkaline refractory" for new building materials
The basic refractory material mainly refers to a refractory material mainly composed of magnesium oxide and calcium oxide, and has strong corrosion resistance to alkaline slag. Including magnesium brick, magnesium aluminum brick, magnesia chrome brick, dolomite brick, etc. (see magnesia brick).
Commonly used is magnesia brick. Magnesia bricks containing 80% to 85% of magnesia have good resistance to alkaline slag and iron slag, and have higher refractoriness than clay bricks and silica bricks. Mainly used in open hearth furnaces, oxygen blowing converters, electric furnaces, non-ferrous metal smelting equipment and some high temperature equipment.
Basic refractory characteristics
An inorganic non-metallic material having a refractoriness higher than 1580 °C. Refractoriness refers to the Celsius temperature of a refractory cone specimen that resists high temperatures without softening without melting. Refractory materials are associated with high-temperature technology, which originated in the middle of the Bronze Age. In the Eastern Han Dynasty of China, clay refractories were used to make kiln and enamel for burning porcelain. At the beginning of the 20th century, refractory materials were developed in the direction of high-purity, high-density and ultra-high-temperature products. At the same time, unshaped refractories and refractory fibers that did not require firing and had low energy consumption appeared. Modern, with the development of atomic energy technology, space technology, and new energy technology, refractories with high temperature resistance, corrosion resistance, thermal shock resistance, and erosion resistance have been applied.