Clean steel smelting system and method

Abstract

The invention relates to a clean steel smelting system and method, and belongs to the technical field of metallurgy. The clean steel smelting system comprises a primary smelting furnace, a slag-steel separation device, a refining furnace and a continuous casting ladle which are sequentially arranged in the flowing direction of molten steel, the slag-steel separation device is used for removing high-oxidability steel slag in the molten steel, deoxidation alloying operation is not carried out during primary smelting tapping, and deoxidation and alloying are carried out in sequence during refining. By arranging the slag-steel separation device, the high-oxidability steel slag of the primary smelting furnace is prevented from entering the refining process, the possibility that the molten steel is polluted is reduced, and the consumption of alloy for steel slag deoxidation is reduced; and meanwhile, the alloying operation is carried out in the refining furnace after deoxidation is finished, so that the alloy yield is increased, and generation of oxide inclusions is inhibited from the source.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and relates to a clean steel smelting system and method. Background technique [0002] The current typical clean steel smelting process is: molten iron pretreatment → primary smelting furnace (electric arc furnace or converter) → out-of-furnace refining (LF / VD / VOD / RH) → continuous casting. [0003] 1) During the tapping process of the primary furnace, measures such as slag blocking balls, sliding plate slag blocking, and slag detection are often used to control the slag. However, practical application shows that a large amount of steel slag still enters the refining process. The highly oxidative primary steel slag enters the refining process and will pollute the molten steel. Deoxidation alloys are usually used to reduce the oxygen in the slag to change the physical and chemical properties of the steel slag, but increase the production cost; [0004] 2) In the molten steel at the end of smel...

AI Technical Summary

Problems solved by technology

On the one hand, it leads to a decrease in alloy yield; in addition, alloying elements combine with oxygen to form a large number of inclusions, which are difficult to remove and affect the quality of molten steel;

[0005] 3) When smelting high-quality steel grades, double refining facilities such as LF+VD or LF+RH are often used, and the treatment cycle of a single process is more than 30 minutes, resulting in an increase in the natural temperature drop of molten steel;

[0006] 4) The ladle is loaded with molten steel and the ladle is lifted by a large casting crane, which leads to complex design of the load-bearing structure of the workshop and increased investment

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