Introduction of magnesia-calcium bricks

The magnesia-calcium brick, also known as high calcium magnesite brick, is a kind of magnesial refractory material with periclase as principal crystalline phase and tricalcium silicate as secondary phase. It contains 80 % ~ 87% MgO, 6 % ~ 9% CaO, CaO/SiO2 ratio is between 2.2 ~ 3.0. Its significant structural feature is periclase directly contact with dicalcium silicate and tricalcium silicate, making eutectic solution-4 Cao-Al2O3-Fe2O3 fill into crystal gap between dicalcium silicate and tricalcium silicate. Its porosity is low, the refractoriness under load is higher than 1700 ℃. It has good alkaline slag resistance ability, but with poor thermal shock resistance. Made by calcium magnesia sand as refractory raw material, it will be made by firing at 1550~1600 ℃ after crushing, burdening, mixing and molding. It will be used at eye place of side-blown converter, top place of open-hearth furnace and oxygen-blown converter etc.

Magnesia-calcium brick has seven properties: High temperature resistance, slag resistance, spalling resistance, wear resistance, purifying molten steel and hydration resistance performance.

With the increasing production of stainless steel and all kinds of clean steel products, the demand of various magnesia calcium brick are increasing accordingly. For better production and using correctly, detailed understanding and learning of working performance and influencing factors of magnesia calcium bricks are very necessary.

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