Dephosphorization method for electric-arc furnace steelmaking

An electric arc furnace and charge technology, applied in the field of iron and steel metallurgy, can solve the problems of insufficient stirring strength of molten pool, difficult to meet high-efficiency dephosphorization, serious "rephosphorization" of molten steel, etc., so as to reduce the use and smelting production costs and improve the dephosphorization effect. , the effect of improving the service life

Active Publication Date: 2016-07-27
UNIV OF SCI & TECH BEIJING
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional EAF steelmaking slag dephosphorization process has problems such as slow slag melting speed, insufficient stirring strength of the molten pool, slow mass transfer between slag and steel, and slow dephosphorization reaction speed. Requirements for efficient dephosphorization
At the same time, in the late stage of electric arc furnace smelting, the "phosphorus return" of molten steel is serious, and the phosphorus content of molten steel at the end point is relatively high

Method used

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  • Dephosphorization method for electric-arc furnace steelmaking
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  • Dephosphorization method for electric-arc furnace steelmaking

Examples

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Embodiment 1

[0049] The present invention is applied in 90t electric arc furnace steelmaking, and two spray guns are installed, which are distributed on both sides of the electric arc furnace door. The outlet of the spray gun is 500mm below the liquid steel surface, and the angle with the horizontal plane is 10°. The dephosphorization powder is lime powder, the particle diameter is 50μm, and the single-gun spraying rate is 10~100kg / min. The carrier gas is oxygen, and the oxygen flow rate of a single gun is 50~1500Nm 3 / h. The annular gap gas is nitrogen, and the flow rate of a single gun is 10~500Nm 3 / h. The molten iron ratio is 40%, and the initial phosphorus content of the furnace charge is 0.1%, which is a low phosphorus content furnace charge smelting switching mode. image 3 .

[0050] 1) Before adding molten iron, the spray gun adopts the air blowing anti-blocking mode to spray: the central tube sprays oxygen with a flow rate of 60Nm 3 / h; Nitrogen gas is injected into the ann...

example 2

[0057] Example 2: The present invention is applied in 150t electric arc furnace steelmaking. Four spray guns are installed, which are evenly distributed on both sides of the electric arc furnace door. The outlet of the spray gun is 750mm below the liquid steel surface, and the angle with the horizontal plane is 15°. The dephosphorization powder is limestone powder, the particle diameter is 30μm, and the single-gun spraying rate is 10~200kg / min. The carrier gas is O 2 and CO 2 Mixed injection, single gun oxygen flow 50~2000Nm 3 / h. The gas in the annular seam is natural gas, and the flow rate of a single gun is 10~300Nm 3 / h. The molten iron ratio is 70%, and the initial phosphorus content of the charge is 0.17%, which is a high-phosphorus charge charge smelting mode. See Figure 4 .

[0058] 1) Before adding molten iron, the spray gun adopts the air blowing anti-blocking mode to spray: the central tube sprays oxygen, and the flow rate is 100Nm 3 / h; natural gas is inje...

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Abstract

The invention provides a dephosphorization method for electric-arc furnace steelmaking, and belongs to the field of electric-arc furnace steelmaking. The dephosphorization method is characterized in that the same spray gun is utilized for delivering oxygen gas, protective gas and carrier gas-dephosphorization powder into an electric-arc furnace molten pool directly, wherein the carrier gas-dephosphorization powder is dephosphorization powder carried in the carrier gas; gas flow violently impacts and stirs a steelmaking molten pool, so that the dephosphorization powder is in sufficient contact with molten steel directly, and good thermodynamic and dynamic conditions are provided for molten pool dephosphorization reaction, and dephosphorization efficiency of an electric-arc furnace steelmaking process is improved, consumption of slag charge such as a dephosphorization agent is reduced, a dephosphorization rate of a smelting process is increased, the quality of end-point molten steel is improved, and the production cost is reduced.

Description

technical field [0001] The invention mainly belongs to the technical field of iron and steel metallurgy, and in particular relates to an electric arc furnace steelmaking dephosphorization method. Background technique [0002] With the development of electric arc furnace molten steel hot charging technology, dephosphorization operation has become one of the important processes in the electric arc furnace smelting process. The key lies in the rapid slagging and dephosphorization in the early stage of electric arc furnace Prevent molten steel from "returning to phosphorus" in the later stage. With the continuous strengthening of oxygen supply in the electric arc furnace steelmaking process and the application of bottom blowing and stirring technology, the pace of electric arc furnace steelmaking continues to accelerate. How to quickly and efficiently dephosphorize the electric arc furnace during the smelting process has become the key to the current clean and efficient smelting...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/52C21C7/064C21C7/068
CPCC21C5/52C21C7/064C21C7/0645C21C7/068Y02P10/20
Inventor 董凯魏光升朱荣刘润藻马国宏胡绍岩王云吴学涛苏荣芳王洪朱长富王连森
Owner UNIV OF SCI & TECH BEIJING
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