Submerged arc slag for refining aluminum-containing low-silicon steel ladle and preparation method for submerged arc slag

Abstract

The invention discloses submerged arc slag for refining aluminum-containing low-silicon steel ladle and a preparation method for the submerged arc slag. The submerged arc slag is prepared from the following raw materials: limestone, dolomite, soda ash, high-aluminum vanadine, coke and cement clinker. The submerged arc slag comprises the following chemical compositions in percentage by weight: more than 35 percent and less than 45 percent of CaO, more than 6 percent and less than 10 percent of Al2O3, more than 5 percent and less than 8 percent of MgO, more than 3 percent and less than 5 percent of Na2O, less than 5 percent of SiO2, more than 3 percent and less than 5 percent of C and the balance of impurities. The blocky limestone and spherical materials including limestone powder, dolomite powder and the like are reasonably matched to improve the submerged arc performance. Aiming at aluminum-containing low-silicon steel ladle furnace (LF) refining, the mixed submerged arc slag can prolong submerged arc time, improve submerged arc heating effect and prolong the service life of a furnace liner; and moreover, after water is added, silicon cannot be increased in the molten steel, the requirement on components of final slag for aluminum-containing steel LF refining is met, and the molten steel refining effect can be ensured.

Description

technical field [0001] The invention relates to a submerged arc slag, in particular to a submerged arc slag for refining an aluminum-containing low-silicon steel ladle and a preparation method thereof, belonging to the technical field of steelmaking and molten steel refining. Background technique [0002] With the development of continuous casting technology and the continuous improvement of steel quality requirements, ladle refining furnace (LF) has been paid more and more attention. Using the heating and refining function of the ladle furnace can provide qualified molten steel for continuous casting, and coordinate the rhythm of steelmaking and continuous casting. The ladle refining furnace adopts submerged arc heating, and the synthetic slag is melted into slag to form part of the foam slag, which can be submerged arc heating operation on the arc to reduce the damage of the arc to the lining and cover refractory materials, which can protect the lining and reduce the cost ...

AI Technical Summary

Problems solved by technology

The amount of submerged arc slag added is relatively large, 6-10Kg / ton of steel, and it contains more metallic aluminum, so the cost is higher, and generally speaking, CaO / Al in traditional aluminum-containing low-silicon steel 2 o 3 =1.6~1.9, so adding a large amount of submerged arc slag is not conducive to the accurate control of the final composition of aluminum-containing steel refining

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