Factors Affecting Refractory Materials for Electric Furnace Cover

1.Arc radiation
When the electric furnace is smelted, the arc temperature generated by the discharge of the electrode is as high as 3000 ° C or more, and the small furnace cover working face is subjected to severe melting loss.
2.Thermal shock
The arc heating, tapping and the rotation of the furnace cover to the outside of the furnace cause quenching and rapid heat, which causes the furnace cover to generate thermal stress and cause the working surface to peel off.
3. Chemical attack
The molten steel and slag are sprayed onto the working surface of the furnace cover, and some of the chemical components chemically react with the working surface and penetrate into the working surface to form a metamorphic layer.
4. Electrode spray water
The use of spray water on the electrode not only reduces the electrode consumption, but also causes the temperature around the electrode hole to decrease, thereby suppressing the high temperature melt loss to some extent. If this measure is not used, the electrode hole damage will be aggravated, mainly as reaming.
Changxing refractory provides refractory products, calcium silicate products, castable & mortar, china refractory brick, ceramic fiber felt, ladle & tundish nozzle, ceramic fiber with high quality for you. Such as high alumina refractory bricks, magnesia carbon brick, clay refractory bricks and other refractory products.

Article Source : Factors Affecting Refractory Materials for Electric Furnace Cover
Company name:Henan Xinmi Changxing Refractory Materials Co.,Ltd
Email: sales1@chinafirebrick.com
Website:http://www.chinafirebrick.com/

Some measures to improve the life of ladle slag line bricks

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.

Article Source:magnesia carbon bricks
Company name:Henan Xinmi Changxing Refractory Materials Co.,Ltd
Email: sales1@chinafirebrick.com
Website:http://www.chinafirebrick.com/