首页| Introduction to Carbon Free Refractory Lining for Ladle Steel Bath in EAF Steel Mill
Introduction to Carbon Free Refractory Lining for Ladle Steel Bath in EAF Steel Mill
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It is prospected that, in accordance with the progress of environmental and ecological activities connected with achieving carbon neutralization by 2050, the ratio of steel production by electric arc furnace (EAF), which is characterized by a smaller amount of CO2 emission, will increase in the steel industry. Consequentially, production of high-grade steel products would increase in EAF steel mill, resulting in intensification of secondary refining treatments in the teeming ladle to guarantee steel qualities. Since teeming ladle refractories are severely damaged by intensive secondary refining, Al_2O_3-MgO-C brick is usually applied. As an alternative teeming ladle refractory, Al_2O_3-MgO refractory with superior corrosion resistance are introduced in this article as carbon free refractory for steel bath in teeming ladle in which intensive secondary refining is conducted. In practice, according to teeming ladle operational conditions, ALTIMA unburnt Al_2O_3-MgO brick, Al_2O_3-MgO castable refractories and precast block fabricated with Al_2O_3-MgO monolithic refractory can be used in combination. By applying carbon free refractories with low thermal conductivity for the steel bath in the teeming ladle, suppression of heat radiation from the teeming ladle steel shell results in the reduction of CO2 gas emission in EAF operation is expected along with prevention of molten steel contamination by the C component contained in refractories. In the case where a teeming ladle is relined with castable refractories, reduction of teeming ladle refractory unit consumption is expected by adopting partial additional repair work along with reduction of waste disposal. Because of such advantageous characteristics, carbon free refractories are practically applied for teeming ladle in several steel mills.
Eiji Ishihara、Masafumi Nishimura
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Shaped Refractories R&D Sec, Research Dept. No.1, Research Center
Unshaped Refractories R&D Sec, Research Dept No.2, Research Center
NSTL
