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Elements which effect Lining Performance(1)


1.Lining process
The quality of lining lining directly affects the service life. Keep the sand material uniform in particle size and no segregation of coarse and fine particles. The layer is tightly combined during feeding. The higher the density of the lining after lining, the higher the strength of the sintered layer after sintering, and the smaller the tendency for cracks on the furnace wall. When the furnace lining is knotted, the vibration is not firm, which will cause the furnace lining to be not dense or partially loose. When the pressure of the molten metal is high, leakage may occur. After a layer is manually knotted, the surface will be loosened and the material will be added to cause delamination. During use, the lining will produce transverse cracks, which cannot be bridged. The temperature rises too fast during the drying and sintering process, and the moisture in the charge escapes rapidly and will form a large number of micropores on the furnace wall. These micropores may cause the molten metal to penetrate and adsorb the slag. Therefore, formulating and strictly abiding by the furnace building process operating regulations is the primary condition for extending the life of the furnace lining.

2.Furnace capacity
The capacity of the induction electric furnace increases, and the static pressure of the molten metal on the furnace wall increases. The pressure at the junction of the furnace bottom and the furnace wall, as the static pressure increases, the rate of molten metal penetrating into the micropores or microcracks on the furnace wall also increases

3.Furnace wall thickness
The increase of electromagnetic stirring force will also increase the scouring effect on the furnace wall. If the furnace wall thickness is reduced in pursuit of over-installation, especially for larger electric furnaces, the life of the furnace lining will be significantly shortened. Selecting and mixing furnace lining materials suitable for large-capacity electric furnaces and achieving a reasonable wall thickness can improve its use.

4.Melting temperature
The temperature of molten metal is too high, and the corrosion of the slag on the furnace lining is intensified; the fluidity of the molten metal is good, and the chemical attack on the furnace lining is intensified. High temperature tapping and low temperature pouring have always been operating guidelines. Every kind of casting has its melting process requirements. Frequent observation and temperature measurement are required to achieve the appropriate temperature, and not too much pursuit of over-temperature.

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