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LF furnace refining slag used for aluminum-containing steel

A technology for refining slag and aluminum steel, applied in the direction of improving process efficiency, etc., can solve the problems of limiting LF furnace, single refining slag formula, unable to meet the production of aluminum-containing steel, etc., to achieve the effect of improving metallurgical properties and improving the life of ladle

Inactive Publication Date: 2008-02-20
CHONGQING UNIV
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the increasing number of steel products produced by LF furnace, the output scale is getting larger and larger, but the existing LF furnace refining slag formula is single, which not only seriously limits the full play of the advantages of LF furnace in the production of high-grade aluminum-containing steel. , and can no longer meet the needs of aluminum-containing steel production, especially for aluminum-containing steels that require a higher level of inclusions

Method used

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Embodiment Construction

[0013] According to the design principle of the present invention, the LF furnace refining slag for aluminum-containing steel is prepared from bauxite, lime, dolomite, limestone and wollastonite, and is combined into multiple ingredient formulas (weight % of chemical ingredients) according to different ingredients. According to the chemical composition of the refining slag agent as shown in Table 1, it is not difficult to calculate the weight of the required raw materials; then the above-mentioned raw materials weighed in proportion are melted evenly in the submerged arc furnace, cooled naturally after being released from the furnace; crushed and bagged for use.

[0014] Table 1 LF refining slag formulation (weight %) for aluminum-containing steel

[0015] Slag number

CaO

SiO 2

al 2 o 3

MgO

h 2 o

loss

S

B 1 L 1

B 1 L 2

B 1 L 3

B 2 L 1

B 2 L 2

B 2 L 3

B 3 L 1

...

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Abstract

The invention discloses an aluminium-steel related ladle furnace refining slag, prepared with bauxite, calcareousness, dolomite, limestone and wollastonite. The weight percentage of the chemical components are: CaO 58.05 to 64.07, SiO2 4.41 to 4.67, Al2O3 17.57 to 20.97, MgO 1.84 to 3.25, H2O 0.09 to 0.22, S 0.042 to 0.044 and the rest is loss. By adjusting the usage amount of proportioning of the refining slag, the invention provides a melting property, foaming property, viscosity, alkalinity, reduction property, surface tension and conductive property that can meet the need of aluminium-steel related production and produce refining slag of refineing molten steel with comparatively high quality.

Description

technical field [0001] The invention relates to LF furnace refining slag for aluminum-containing steel, in particular to optimizing the formula of LF furnace refining slag so that its metallurgical performance meets the smelting requirements of aluminum-containing steel. Background technique [0002] As an important production process in the modern steelmaking process, extra-furnace refining is widely adopted by most steel plants in the world. With the progress of pure steel production technology and the development of continuous casting technology, as well as the requirement of reducing production costs, the extra-furnace refining process and equipment Rapid popularity. In Japan, Europe, the United States and other advanced developed countries, the refining ratio outside the furnace reaches more than 90%, of which the vacuum refining ratio exceeds 50%. [0003] As an important part of the short-flow process, refining outside the furnace plays a pivotal role in the whole pr...

Claims

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Application Information

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IPC IPC(8): C21C7/076
CPCY02P10/20
Inventor 刘清才胡兵刘守平董凌燕杨剑杜云贵温良英
Owner CHONGQING UNIV