A low-cost silicon carbide deoxidation method

Abstract

The invention discloses a low-cost silicon carbide deoxidation method, and belongs to the technical field of ladle refining. The low-cost silicon carbide deoxidation method is characterized by comprising the following process steps: slag washing, refining, electric slagging and deoxidation, wherein a deoxidizer comprises silicon carbide and calcium carbide, acceleration of a steel slag interface reaction and soft blowing. Compared with the prior art, the low-cost silicon carbide deoxidation method has the characteristics that the product deoxidation effect is good, the deoxidation cost is reduced remarkably and the product quality is stable.

Description

【Technical field】 [0001] The invention relates to the technical field of LF refining, in particular to a low-cost refining technology suitable for deoxidation of killed steel. 【Background technique】 [0002] According to the degree of deoxidation during smelting, steel is divided into boiling steel, semi-killed steel and killed steel. In continuous casting, it needs to be completely deoxidized killed steel. In the prior art, CaO-CaF is used when smelting non-low silicon aluminum killed steel. 2 Refining slag system, the slag system increases with the increase of CaO, the viscosity of the slag increases, the slag has a high alkalinity, and there is no SiO 2 The slag material neutralizes the alkalinity of the slag. [0003] This process has the following defects in application: ①CaF 2 The main function is to improve the fluidity of slag, reduce the melting point of slag, increase the diffusion rate of desulfurization products, improve the kinetic conditions of desulfurizati...

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Problems solved by technology

[0003] This process has the following defects in application: ①CaF 2 The main function is to improve the fluidity of slag, reduce the melting point of slag, increase the diffusion rate of desulfurization products, improve the kinetic conditions of desulfurization, thereby adjusting the viscosity of slag, but can not adjust the alkalinity. Severe erosion of furnace lining and ladle slag line; at the same time, the viscosity of this slag system is small, which is not conducive to submerged arc operation, resulting in radiation erosion of the arc to the lining; in addition, CaF 2 It will also react with other components in the slag to generate fluorine-containing gas that will pollute the environment; ② single calcium carbide (CaC 2 ) diffusion deoxidation method, as the amount of slag increases, the amount of calcium carbide increases significantly, while the price of calcium carbide remains high, which squeezes the profit margins of steel companies and seriously affects the economic benefits of enterprises; ③ When deoxidizing killed steel, the slag at the end of refining is white slag Finally, feed the metal calcium wire to denature the deoxidation product, which will increase additional costs; ④Single calcium carbide is used as LF deoxidizer, and the sampling inspection of casting slab inclusions grade ≥ 3.0 is 4.3 times per month on average, indicating that the number of inclusions is large. The inclusions are mainly sulfide inclusions and oxidized inclusions, a small part of the sulfide inclusions and oxidized inclusions gather in the segregation area, most of the sulfide inclusions and oxidized inclusions are due to the unreasonable deoxidation system, and the inclusions in the molten steel are not fully denatured and removed, resulting in the casting slab There are many inclusions grade ≥ 3.0, which affects the quality of the end product and increases the economic loss of the enterprise

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