Method for improving service life of ladle slag line lining bricks

Abstract

The invention relates to a method for improving the service life of ladle slag line lining bricks. In the method, the chemical properties of slag is controlled and modified by adding MgO into the slag by stage. In a refining process, MgO, which accounts for 50 to 63 percent of the total amount, is added into the slag to control the MgO content of the slag to approach a saturated concentration; and after static argon blowing, MgO, which accounts for 40 to 46 percent of the total amount, is added into the slag to control the MgO content of the final slag to be greater than a saturated concentration, so the amount of the MgO fused into slag from slag line MgO-C lining bricks is reduced. The destruction speed of the slag line lining bricks is reduced by 60 percent, so the corrosion loss of the slag line lining bricks is relieved greatly, the service life of the slag line lining bricks is prolonged, the consumption of refractory materials is reduced, the replacement and repair workloads are reduced, and the using efficiency of the ladle is improved. The process is simple and easy to implement, the operation is convenient and reliable, the control is accurate and effective, and on extraequipment is used.

Description

technical field [0001] The invention belongs to the field of refractory materials for steelmaking, and in particular relates to a method for increasing the service life of ladle slag lining bricks by adding MgO to LF furnace ladle slag. Background technique [0002] At present, domestic steelmaking and rolling mills generally use LF furnaces to refine molten steel, and the refractories lining the slag line are mostly MgO-C lining bricks. Due to the properties of molten slag, especially the pH of the final slag, The slag caused serious erosion of the slag-line lining brick, so the service life of the MgO-C lining brick was greatly reduced, which not only increased the consumption of refractory materials, but also increased the smelting cost, and directly affected the use efficiency of the ladle, increasing the Efforts to replace and repair. Contents of the invention [0003] The object of the present invention is to address the above defects and provide a method with low c...

AI Technical Summary

Problems solved by technology

[0002] At present, domestic steelmaking and rolling mills generally use LF furnaces to refine molten steel, and the refractories lining the slag line are mostly MgO-C lining bricks. Due to the properties of molten slag, especially the pH of the final slag, The slag caused serious erosion of the slag-line lining brick, so the service life of the MgO-C lining brick was greatly reduced, which not only increased the consumption of refractory materials, but also increased the smelting cost, and directly affected the use efficiency of the ladle, increasing the Efforts to replace and repair