Cause Analysis of Damaged Furnace Lining

Furnace lining, is a coreless intermediate frequency induction furnace suitable for iron and steel plants, foundries and metal manufacturing. It needs to supply high temperature resistant lining materials when firing the furnace. The main raw material of the material belongs to the quartz matrix, the chemical property is acidic, based on the high-purity microcrystalline quartz matrix. Adding part of fused silica, high temperature resistant binder, anti-quick cooling and rapid heat stabilizer, anti-seepage agent, anti-cracking agent, and imported composite micro-powder material can improve the expansion drawback of the furnace lining, and there is no crack during cooling.

Analysis of the cause of the damage:

A. The penetration of molten iron destroys the penetration of molten iron into the carbon brick along the pores of the carbon brick. The infiltrated molten iron dissolves the binder in the carbon brick, and then dissolves the carbon particles in the carbon brick, destroys the compactness of the carbon brick, and reduces the carbon brick. The molten iron infiltrated into the carbon brick reacts with the carbon brick to form a brittle substance like FexC. The hot surface of the carbon brick forms an embrittlement layer.
B, the circulation of molten iron in the furnace
The circulation of molten iron aggravates the erosion and erosion of the brittle layer on the surface of the carbon brick by molten iron, which makes the carbon brick thinner. The bricks are strongly eroded by the flowing slag iron, thereby reducing the life of the furnace lining.

Erosion of carbon bricks by C, alkali metals and zinc
Thermodynamic calculations show that when the heat transfer performance of the carbon brick is poor, there is a large temperature difference between the hot surface and the cold surface, and the thermal stress of the temperature difference inside the carbon brick is large, which induces cracks in the carbon brick, and pure alkali metal vapor passes through the carbon brick. The micro-cracks of the carbon bricks continuously flow and spread to the low temperature area of ​​the carbon brick, and the micro-cracks are the cause of ring cracks. If the alkali metal vapor enters the micro-cracks of the carbon brick, when the temperature reaches 800 degrees Celsius, the alkali metal vapor will be in the micro-cracks. Liquefaction, and then react with the silica-alumina ash of carbon bricks,

The above is the analysis of the reasons for the damage to the furnace lining

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