Deep desulfurization method for LF furnace

Abstract

The invention discloses a deep desulfurization method for an LF (ladle furnace), which relates to the technical field of steelmaking and refining and comprises the following steps: adding a deoxidizer and an alloy before tapping according to the requirements of smelted steel grades, deoxidizing and alloying molten steel, and carrying out primary white slag desulfurization; the sulfur content of the molten steel is reduced to 0.010% or below, white slag in the molten steel tank is fished out into a slag storage tank through a slag fishing machine, secondary white slag desulfurization is carried out, the sulfur content of the molten steel is reduced to 0.003% or below, and secondary anti-oxidation treatment is carried out on the desulfurized molten steel; according to the method, the slag making material reducing white slag is added in the tapping process, the sulfur content of the molten steel can be reduced to 0.010% or below in the primary white slag making process, the sulfur content of the molten steel can be reduced to 0.003% or below by adding the slag making material again for secondary white slag making after the slag is dredged by the slag dredger, the cleanliness of a finished product of the molten steel is higher, and the quality of the molten steel is improved. And it can be guaranteed that the LF can achieve the purpose of smelting extremely-low-sulfur steel.

Description

technical field [0001] The invention relates to the technical field of steelmaking and refining, in particular to a deep desulfurization method in an LF furnace. Background technique [0002] The LF furnace has strong deoxidation ability by making white slag, and can desulfurize molten steel. However, for steel grades with extremely low sulfur content requirements, it is difficult to achieve the goal of low-sulfur smelting according to the normal slag-making process. The main reason is that in the process of reducing white slag desulfurization in LF furnace manufacturing, the sulfur content in the slag increases while the sulfur content in the molten steel decreases. The content is reduced even lower, and the smelting of extremely low-sulfur steel cannot be realized; therefore, the present invention proposes a deep desulfurization method in an LF furnace to solve the deficiencies in the prior art. SUMMARY OF THE INVENTION [0003] In view of the above-mentioned problems, ...

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Problems solved by technology

[0002]The LF furnace has a strong deoxidation ability through the production of white slag, and can desulfurize molten steel. Slag technology is difficult to achieve low-sulfur smelting goals

The main reason is that during the desulfurization process of reducing white slag in LF furnace, the sulfur content in slag increases while the sulfur content in molten steel decreases. The content is reduced even lower, and the smelting of ultra-low sulfur steel cannot be realized; therefore, the present invention proposes a method for deep desulfurization of LF furnace to solve the deficiencies in the prior art

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