Selection of refractory material for VOD ladle lining

Only refractory materials with the following two characteristics can be used as the lining of the VOD furnace: 1) It can resist the erosion of high-temperature slag; 2) It has excellent resistance to spalling in a sudden cold and hot environment. At present, the refractory materials used in VOD furnaces are generally magnesia dolomite bricks and magnesia chrome bricks.

1. Magnesium Dolomite Brick

MgO is the main component of magnesia dolomite fire brick. When the impurity elements are less than 1.5%, its high temperature strength will be very good. The magnesium oxide composition of magnesia dolomite bricks designed and produced in Japan and some European countries fluctuates from 60% to 90%, but the sum of magnesium oxide and calcium oxide reaches about 98%. Magnesia dolomite fire bricks have more outstanding thermal shock resistance than magnesia chrome bricks, because the calcium oxide in the refractory bricks can form a new phase with a very high melting point with the slag, and the erosion of the refractory bricks will also be weakened. The calcium oxide in the fire lining can increase the wetting angle and strengthen the ability of fire bricks to resist corrosion by molten steel.

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