Method for deep desulfurization of molten steel refining, device and application for molten steel refining

A technology for deep desulfurization and molten steel, which is applied in the field of equipment for deep desulfurization and molten steel refining, can solve the problems of low stirring effect of argon gas-enhanced molten pool and the desulfurization kinetic conditions need to be further improved, so as to improve the thermodynamics of desulfurization. and kinetic conditions, low-cost and high-efficiency removal, and the effect of shortening smelting time

Active Publication Date: 2021-04-30
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent application CN110982988A discloses a desulfurization method and a steelmaking method for promoting the contact of steel slag in the LF refining furnace. Combining the gas phase, the steel slag and the molten steel are simultaneously desulfurized by circulating flow; however, the argon-enhanced molten pool agitation effect that this method can achieve is relatively low, and its desulfurization dynamics conditions need to be further improved

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  • Method for deep desulfurization of molten steel refining, device and application for molten steel refining
  • Method for deep desulfurization of molten steel refining, device and application for molten steel refining

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Embodiment 1

[0078] The molten steel refining deep desulfurization process in this embodiment adopts such as figure 1 The shown device for refining molten steel is carried out, and the specific process is as follows:

[0079] ①Converter tapping, in the process of tapping the molten steel to be refined to the ladle, the bottom blowing argon gas is started after the ladle sees flow, and the flow rate of the bottom blowing argon gas is 1.2NL / (min·t); 1 / 4 of the total mass of the molten steel to be refined is tapped into the ladle, and then active lime is added. The amount of active lime added is 3.2 kg / t.

[0080] ② When LF enters the station, the sulfur content of molten steel to be refined (initial sulfur content) [S] 进 After all the molten steel to be refined is tapped into the ladle, the ladle containing the molten steel to be refined is sent to the LF station (refining station), and after entering the LF station, adjust the bottom blowing argon The gas flow rate is 4NL / (min·t).

[008...

Embodiment 2

[0087] The molten steel refining deep desulfurization process in this embodiment adopts such as figure 1 The shown device for refining molten steel is carried out, and the specific process is as follows:

[0088] ①Converter tapping, in the process of tapping the molten steel to be refined to the ladle, the bottom blowing of argon is started after the ladle sees flow, and the flow rate of the bottom blowing argon is 2NL / (min·t); 1 / 4 of the total mass of the molten steel to be refined is tapped into the ladle, and then active lime is added. The amount of active lime added is 3.8 kg / t.

[0089] ② When LF enters the station, the sulfur content of molten steel to be refined (initial sulfur content) [S] 进 is 36ppm; after all the molten steel to be refined is tapped into the ladle, the ladle containing the molten steel to be refined is sent to the LF station (refining station), and after entering the LF station, adjust the bottom blowing argon The gas flow rate is 6NL / (min·t).

[...

Embodiment 3

[0096] ①Converter tapping, in the process of tapping the molten steel to be refined to the ladle, the bottom blowing of argon is started after the ladle sees flow, and the flow rate of the bottom blowing argon is 2NL / (min·t); 1 / 4 of the total mass of the molten steel to be refined is tapped into the ladle, and then active lime is added, and the amount of active lime added is 4.0 kg / t.

[0097] ② When LF enters the station, the sulfur content of molten steel to be refined (initial sulfur content) [S] 进 After all the molten steel to be refined is tapped into the ladle, the ladle containing the molten steel to be refined is sent to the LF station (refining station), and after entering the LF station, adjust the bottom blowing argon The gas flow rate is 7NL / (min·t).

[0098] ③Preliminary stage of slag removal: Open the top-blowing argon valve, and top-blown argon into the ladle. Argon plasma slag formed by argon gas for 3 minutes, then adjust the flow rate of top-blown argon to ...

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Abstract

The invention relates to a method for deep desulfurization of molten steel refining, a device for refining molten steel and its application. The method is as follows: S1, tapping the molten steel to be refined into a ladle and adding smelting materials into the ladle containing the molten steel to be refined, to obtain the steel material to be refined; S2, according to the Initial sulfur content of molten steel [S] 进 and target sulfur content [S] 目 , to determine the process parameters of lime powder injection, carbon powder injection and top-blown argon gas injection when the steel material to be refined is refined; S3, the steel material to be refined is refined; , injecting lime powder-carbon powder-argon mixed powder flow into the steel material to be refined through the hollow electrode to deeply desulfurize the molten steel. The present invention carries out deep desulfurization by dynamically injecting lime powder and carbon powder through hollow electrodes, which can not only ensure reasonable decarburization and desulfurization of molten steel, improve desulfurization kinetic conditions, increase desulfurization efficiency, shorten smelting time, but also reduce power consumption and electrode loss , to reduce production costs.

Description

technical field [0001] The invention belongs to the technical field of out-of-furnace refining, and in particular relates to a method for deep desulfurization of molten steel refining, a device for refining molten steel and its application. Background technique [0002] Sulfur is generally a detrimental element for most steel grades. Sulfur will exist in the grain boundary or heterogeneous interface of steel in the form of sulfide, which will have a great impact on the processing performance, mechanical performance, corrosion and welding performance of steel. Such as: the formation of sulfide inclusions will reduce the ductility and toughness of steel; the formation of low melting point FeS will cause hot embrittlement of steel in hot rolling and welding; when the sulfur content in steel is high, it will significantly reduce its resistance to hydrogen induction. crack corrosion capability. Therefore, in order to improve the quality and performance of steel and reduce the o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/064
CPCC21C7/0025C21C7/064C21C7/0645
Inventor 杨树峰王田田李京社刘威张福君
Owner UNIV OF SCI & TECH BEIJING
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