Selection requirements of refractories for refining ladle slag line

 In the past, magnesia-chrome bricks and high alumina bricks were mainly used for refining ladles as lining refractories for slag line parts and low-corrosion areas respectively. Considering the requirements of environmental protection, except for the vacuum deoxidized ladle, all chromium-free have been realized, and ladle magnesia carbon brick or magnesia-carbon-calcium brick is used as the refractory material for the lining of the slag line, and the molten steel is vacuum refined (Including refined low-carbon and super-carbon steel) The lining of the ladle slag line is made of low-carbon magnesia-carbon bricks.

The choice of ladle magnesia carbon bricks or magnesia-carbon-calcium bricks for the refining ladle slag line mainly depends on the refined steel type, slag characteristics and operating conditions.

The advantages of magnesia-carbon-calcium brick:

The research results show that: in the CaO-SiO2 system slag (low alkalinity slag), the magnesia-carbon-calcium brick has a high corrosion resistance. The reason is: when the MgO-CaO particles contact the CaO-SiO2 slag, the fCaO dissolved from the magnesia-carbon MgO-CaO sand particles will immediately react with the slag components to form a high melting point and 2CaO·SiO2 and 3CaO·SiO2 solidified dense On the surface of the brick, the slag becomes highly viscous and forms a solid protective layer on the brick surface, thereby improving the durability of the magnesia-carbon-calcium brick lining.
At the same time, in the CaO-Al2O3 slag, the loss of MgOCaO-C bricks is serious, and increases with the increase of CaO in the bricks. The reason is that the fCaO dissolved from the refractory brick will immediately dissolve in the CaO-Al2O3 system slag to generate 12CaO 7A12O3 and other low melting point substances, which are discharged from the surface of the brick in the slag in a molten state, which accelerates the conversion of the brick to the slag. In the dissolution. On the contrary, magnesia carbon bricks are easily corroded by CaO-SiO2 slag, but have high resistance to CaO-Al2O3 slag.
From this point of view, it is necessary to select the refractory material for the slag line of the refining ladle according to the specific refining conditions and slag characteristics.

The main damage mechanism of magnesia-carbon lining in the flooded line of refining ladle is the oxidation of C. In addition to the direct oxidation of C, it is mainly caused by the operating temperature (greater than 1650°C) and high temperature and decompression operation. This is especially true under conditions of high temperature and reduced pressure.

Wanhao is a manufacturer who is specialized in designing various kinds of furnace and making ladle magnesia carbon bricks for electric furnace, ladle, tundish, blast furnace, AOD furnace, IF furnace, etc.

Article Source: refractories for refining ladle slag line

More Refractory Products:https://www.wanhaorefractory.com/en/product.html

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Ladle Magnesia Carbon Brick


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