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Some measures to improve the life of ladle slag line bricks

[12/05/2018]

1. Optimize the refined slag system
The light burned dolomite is added during the refining process to increase the MgO concentration in the slag, increase the alkalinity and viscosity of the slag, control the amount of slag under the converter, and reduce the FeO content in the slag. The alkalinity of the refining slag is controlled in the range of 4.2~5.0, and the FeO content in the slag is controlled at about 0.5%. At the same time, the viscosity of the slag is adjusted, and the MgO content in the slag is controlled at about 12%, which can effectively reduce the erosion of the slag on the magnesia carbon brick.

2. Improve slag brick material
The higher the purity of magnesia used in magnesia carbon bricks, the less B2O3 in impurities, and the higher the corrosion resistance of lining bricks when the proportion of carbon to sulfur is high.

The material of the slag-line magnesia carbon brick is improved, and the fused magnesia with high purity is used as the refrafctory raw material, and the carbon content is controlled at about 14%, which can effectively improve the corrosion resistance of the slag line.

3. Control the argon blowing system and the power supply system
The LF furnace adopts an argon blowing mode combining intelligent argon blowing and manual control. By manually controlling the intermittent stirring of large argon gas, the heat transfer of the steel slag near the electrode is promoted, and the slag temperature is too high to cause destructive erosion of the magnesia carbon brick. The VD furnace uses a staged argon control mode. At the same time, the refining and energizing system is controlled. When the power is turned on, the high voltage and low current long arc operation is adopted. After the slag is formed, the low voltage and high current submerged arc operation is used.

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