Formula of steel and iron refining slag system

Abstract

The invention provides a formula of a steel and iron refining slag system. The formula comprises lime, fluorite and aluminum particles to form a calcium oxide-calcium fluoride-silicon dioxide-aluminumoxide slag system. Therefore, the formula achieves the beneficial effects that in the steel and iron refining process, related ores are added into molten steel according to the formula, so that the melting point of the slag system is reduced, the fluidity of slag is improved, the deoxidation of the molten steel and the adsorption of inclusions is further optimized, and the smelting energy consumption is reduced under the condition that the molten steel component meets the technical requirements of silicon, aluminum, oxygen and the like.

Description

technical field [0001] The invention relates to the field of iron and steel smelting, in particular to an iron and steel refining slag formula. Background technique [0002] In the prior art, the vacuum carbon deoxidation process of low-pressure rotor steel refers to the use of carbon powder for deoxidation in the refining and reduction process. In this process stage, in order to ensure that the composition of molten steel meets the technical requirements of Si≤0.10% and Al≤0.010%, the use of deoxidizers containing aluminum and silicon such as aluminum powder and silicon-calcium powder is prohibited in the whole process of the vacuum carbon deoxidation process, so that In the molten steel refining process, the slag is relatively single. In the prior art, the slag is lime and fluorite at a ratio of 3:1 to 4:1, and only C powder is used as a deoxidizer. As a result, the existing slag ratio has led to the following defects in the prior art: the slag has a high melting point, a...

AI Technical Summary

Problems solved by technology

In this process stage, in order to ensure that the composition of molten steel meets the technical requirements of Si≤0.10% and Al≤0.010%, the use of deoxidizers containing aluminum and silicon such as aluminum powder and silicon-calcium powder is prohibited in the whole process of the vacuum carbon deoxidation process, so that In the molten steel refining process, the slag is relatively single. In the prior art, the slag is lime and fluorite at a ratio of 3:1 to 4:1, and only C powder is used as a deoxidizer.

As a result, the existing slag ratio has led to the following defects in the prior art: the slag has a high melting point, and its complete melting temperature is as high as about 2067°C; at 1600°C, the liquid-solid ratio is 1.76, and the slag has poor fluidity, which is not conducive to molten steel deoxidation and the adsorption of inclusions; and the energy consumption of smelting is high, the average power consumption per ton of steel is about 235KW h; the measured value of total oxygen T[O] is as high as 21ppm; the number density of inclusions in steel ingots is 4.6 pieces / mm 2

[0003] The technical problems existing in the iron and steel refining slag formula in the prior art are: high melting point of slag system; poor fluidity of slag; high smelting energy consumption, etc.

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