Magnesia-chrome bricks are refractory products with magnesium oxide (MgO) and chromium trioxide (Cr2O3) as the main components. Magnesia-carbon bricks are made of periclase and spinel as the main mineral components. This type of brick has high fire resistance, high temperature strength, strong resistance to alkaline slag erosion, excellent thermal stability, and has certain adaptability to acid slag. The main raw materials for making magnesia-chrome bricks are sintered magnesia and chromite. The purity of the magnesia raw material should be as high as possible. The requirements for the chemical composition of chromite are: Cr2O3: 30 to 45%, and CaO: ≤ 1.0 to 1.5%.

Magnesia-chrome bricks are mainly used in the metallurgical industry, such as the construction of open-hearth furnace roofs, electric furnace roofs, external furnace refining furnaces and various non-ferrous metal smelting furnaces. The high-temperature part of the furnace wall of the ultra-high-power electric furnace is made of fused cast magnesia-chrome bricks. The high-erosion area of the refining furnace outside the furnace is made of synthetic magnesia-chrome bricks. Made of magnesia-chrome bricks. In addition, magnesia-chrome bricks are also used in cement rotary kiln firing zones and heat storage chambers in glass kilns.