Rotating powder spraying device used for modifying of steel ladle slag and modifying method

Abstract

The invention provides a rotating powder spraying device used for modifying of steel ladle slag and a modifying method. The rotating powder spraying device comprises a lifting unit, an anti-splashing unit, a feeding system, a spraying and blowing system, a rotating unit and a powder spraying gun. The powder spraying gun is an inverted-T-shaped hollow tube. The rotating unit comprises a rotating connector and a motor. The whole rotating connector is of a three-way structure. An inner bearing of the rotating connector is connected with the upper end of a hollow shaft in the motor. The rotating connector in the horizontal direction communicates with a pipeline. The lower end of the hollow shaft is connected with the upper end of the powder spraying gun through a flange. The anti-splashing unit is a big-end-down cylinder. The rotating unit is located in the anti-splashing unit, and the pipeline penetrates through the anti-splashing unit to communicate with the feeding system and the spraying and blowing system through metal hoses correspondingly. The anti-splashing unit is connected with the lifting unit. Flux in the feeding system and carrier gas in the spraying and blowing system are blown into the powder spraying gun through the rotating unit, so that powder is sprayed in a rotating mode. The powder is more uniformly laid between the surface of molten steel and the steel ladle slag through rotating spraying and blowing, and pollution of the steel ladle slag to the molten steel is completely avoided.

Description

technical field [0001] The invention belongs to the technical field of steelmaking, and in particular relates to a method for improving ladle slag by rotating spraying powder. Background technique [0002] In recent years, with the continuous improvement of users' requirements for steel quality, high-quality pipeline steel, container steel, acid-resistant steel, first-class automobile panels, bearing steel, high-speed rail and other low-sulfur and low-oxygen steels have a negative effect on the sulfur content or total Oxygen content puts forward more stringent requirements, requiring the total oxygen content in steel to be lower than 0.0020%, or even lower. The number and size requirements of inclusions in steel for different purposes are also different. Therefore, in order to reduce the adverse effects of oxide inclusions on steel quality, the content of inclusions in steel must be reduced. [0003] To produce clean steel, it is first necessary to improve the cleanliness o...

AI Technical Summary

Problems solved by technology

[0006] Causes secondary oxidation of molten steel, on the one hand, the alloy element aluminum in molten steel is lost, and on the other hand, a large amount of alumina inclusions are formed. During the continuous casting process, the alumina in the steel is very easy to adhere to the continuous casting nozzle. Causes nozzle clogging during the continuous casting process, affects the smooth progress of continuous casting production, and causes unstable casting speed during continuous casting. If the floc falls off during the casting process, large particle inclusions will be formed in the slab, causing Product quality problems and waste products

When the flocculation is serious, the continuous casting will be interrupted, and the molten steel will be forced to heat recovery, causing significant economic losses

[0007] If the modified material is added to the vacuum refining equipment such as RH, the small particle powder in the modified material will be vacuumed away, which will affect the vacuum treatment process of the equipment on the one hand, and cause adverse effects on the vacuum system on the other hand.

If it is carried out in refining equipment such as CAS-OB, the modified material added can only play a role in mixing with ladle slag, and has a limited effect on inhibiting the influence of ladle slag on molten steel

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