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After the blast furnace was shut down, our investigation and research on the hearth lining showed that the section of the hearth lining is composed of the following parts(arc fused alumina). The characteristics of each area of the hearth are summarized as follows: molten iron penetrates into the pores with a diameter of about 1 μm, and the high temperature strength of the carbon brick decreases with the increase of the molten iron penetration(60 grit aluminum oxide).

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The penetration of the molten iron reaches the front surface of the embrittlement layer(silicon carbide price); the dissolution of the carbon bricks in the molten iron first occurs in the matrix; the embrittlement layer is formed along the erosion contour of the furnace side wall and bottom(fused alumina); embrittlement layers can form even when smaller carbon bricks are built; The penetration of molten iron increases the linear thermal expansion of carbon bricks.

The deposition of zinc and alkali near the embrittlement layer is only visible in some blast furnaces(white fused alumina), and not in all other blast furnaces; under normal circumstances, the blast furnace will have a brittle molten iron permeability zone about one and a half years after being used(black oxide aluminum); the linear thermal expansion of carbon bricks caused by the penetration of molten iron in the molten iron erosion zone layer increases with the amount of molten iron penetration ,

We consider the following factors related to the embrittlement layer: deposition of zinc and alkali(white aluminum oxide); penetration of molten iron; generation of thermal stress constrained by linear thermal expansion. Nippon Steel Corporation's Muroran Steel Plant's No. 3 blast furnace was shut down for a year and a half after blowing the sixth furnace(glass beads supplier). According to the inspection of the hearth, it was found that there was a embrittlement layer, shear force is generated on the carbon brick.

Because there is no embrittlement layer in some parts of the hearth(white corundum), there is no exact argument to explain the influence of the above factors, but it is possible that this factor accelerates the deterioration of the structure of the carbon brick. The linear thermal expansion of carbon bricks penetrated by molten iron increases with the amount of molten iron infiltrated(silicon carbide companies). The deposition of zinc and alkali accelerates the cracking of the carbon brick.

If it is inferred that the formation of the embrittlement layer is related to these findings considered, then the embrittlement layer may be generated in this process(brown fused alumina price). The first stage: penetration of molten iron in the pores of carbon bricks. Traditional carbon bricks have about 20% iron penetration(aluminum oxide 220 grit abrasive). The second stage: the dissolution of carbon bricks and the penetration of molten iron occur simultaneously, leading to the penetration of molten iron into the carbon brick. 

The dissolution of carbon bricks in molten iron first occurs in the matrix(black corundum). The penetration of molten iron destroys the structure of carbon bricks, and accelerates the corrosion of carbon bricks in molten iron. At the same time, the repeated solidification and melting of molten iron causes fine cracks in carbon bricks, and makes Reduced brick strength(aluminum oxide 40 grit). However, only a small amount of zinc and alkali are deposited, which shows that the influence of the above factors is very small.

The third stage: the cooling of the cold surface prevents the penetration of molten iron(pink corundum). The fourth stage: due to the difference in physical properties between the molten iron infiltrated part and the undamaged part and the change in the hot surface temperature(green carborundum). The fifth stage: bricks can also form in double-ring structures Embrittlement layer; the internal transfer of carbon bricks and the decomposition of molten iron penetration end.