Performance of Magnesium Aluminum Spinel Brick

November 28, 2018

Performance of magnesium aluminum spinel brick

Magnesium aluminum spinel brick is a new type of refractory material produced by replacing magnesia-chrome spinel in magnesia-chrome brick with magnesia-alumina spinel. MgO accounts for 28.2%, and Al2O3 accounts for 71.8%. Magnesium aluminate spinel belongs to equiaxed crystal minerals. The magnesium aluminum

spinel has a hardness of 8, a relative density of 3.55, a melting point of 2135 ° C, and a small coefficient of thermal expansion. Therefore, the magnesium aluminum spinel bricks have the same performance.

Magnesium aluminum spinel brick is a refractory material with high melting point, low thermal expansion and low thermal stress. And it has good thermal shock stability, strong resistance to alkaline material erosion, good wear resistance, good resistance to high temperature heat load and so on. Compared with the direct combination of magnesia-chrome bricks, the advantages of magnesium-aluminum spinel bricks are resistance to alkali vapor and free SOX erosion, strong redox atmosphere change, no production of Cr6+ to pollute the environment, and good anti-flaking performance.

Magnesium-aluminum spinel bricks improve the performance of magnesia bricks. They are mainly used in furnace roofs for steelmaking and electric furnaces, high-temperature tunnel kiln, large-scale cement rotary kiln and non-ferrous metal smelting furnace.