Corrosion mechanism of magnesia carbon brick by ladle slag

In the ladle, the lining of the slag line is most vulnerable to damage due to the complex physical and chemical environment at the slag line. The chemical attack of the slag on the magnesia carbon brick is mainly through the dissolution of magnesia and the oxidation of the carbon in the matrix of the ladle magnesia carbon brick. Under the combined action of the following factors, the magnesia carbon brick is damaged:

1. The effect of alkalinity: The lower the alkalinity of the slag, the more beneficial it is to the erosion of magnesia carbon bricks. If the alkalinity of the slag increases, the activity of SiO2 in the slag will decrease, which can reduce the oxidation of carbon. With the increase of the temperature, the FeO activity in the slag decreases, which relatively slows down the corrosion behavior of the slag on the magnesia carbon brick;

2. The influence of MgO: Osbom et al. found that the content of MgO in the slag layer was as high as 30% when analyzing the composition of the LF slag line. The higher it is, it also slows down the erosion of the magnesia carbon brick by the slag.

3. The influence of Al2O3: Al2O3 in the slag will reduce the melting point and viscosity of the slag, increase the wettability of the slag and refractory materials, make the slag easier to penetrate from the magnesia grain boundary, and make the periclase separate from the magnesia carbon brick matrix .

4. The influence of FeO: First, the FeO in the slag can easily react with the graphite in the magnesia-carbon brick at high temperature, and produce bright white iron beads to form a decarburized layer as shown in Figure 1. Secondly, the magnesia in the magnesia-carbon brick Stone also reacts with FeO in the slag to produce low melting point products.

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Ladle Magnesia Carbon Brick