What is the erosion process of magnesia carbon bricks in the process of electric furnace smelting

 

The basic process of magnesia carbon brick erosion is:

(1) After the EAF magnesia-carbon brick is reacted, it is divided into three layers: the original brick layer (the brick body that has not reacted), the decarburized layer (the internal MgO and carbon undergo a self-consumption reaction), and the dense layer (the part in contact with the steel slag).

(2) The MgO and carbon inside the magnesia-carbon brick undergo a self-consumption reaction at high temperature:

(3) The oxides in the slag react directly:

Magnesium oxide is reduced to become magnesium gas, which migrates along the pores of the refractory material to the surface and is secondary oxidized to MgO, and forms a high-viscosity lithofacies structure with other impurity elements in the middle of the brick body, that is, the so-called dense layer.?

The erosion process is as follows:

(1) Physical wear. During the blowing process of these lithofacies, the movement of the physical steel slag furnace gas causes its physical and mechanical wear and peeling into the slag.

(2) Chemical attack. The chemical action is that various components in the middle of the slag will react with the dense layer of the brick body, and FeO can promote the dissolution and transfer of magnesia to the middle of the slag, increasing the erosion of EAF magnesia carbon bricks.

(3) The effect of temperature on erosion. The higher the temperature, the lower the viscosity of the steel slag, the intensified physical erosion, and the deepening of the decarburized layer, resulting in intensified erosion.

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Article Source:Why is the R.U.L of refractory materials a key indicator
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