LF furnace shallow dephosphorization refining method

A refining and converter technology, applied in the refining field of shallow dephosphorization of LF furnace, can solve the problems of excessive phosphorus in ladle, steelmaking cost and adverse impact on production efficiency, etc. strong effect

Inactive Publication Date: 2015-11-11
武钢集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Phosphorus is generally a harmful element in steel, and the dephosphorization method mainly adopts converter smelting to remove phosphorus, but converter smelting, such as improper process control or slag during tapping process, may easily cause the phosphorus in the ladle to exceed the standard
The conventional rescue method for ladle phosphorus high is to return the molten steel to the converter for secondary treatment to remove phosphorus, which has an adverse impact on steelmaking costs and production efficiency

Method used

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  • LF furnace shallow dephosphorization refining method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The initial phosphorus content of molten steel entering the LF furnace: w(P)%: 0.034%.

[0020] 1) After the molten steel enters the LF furnace, connect the ladle bottom blowing pipe and an external oxygen source, switch to the argon source after 40 seconds of bottom blowing oxygen, and bottom blow argon throughout the refining process.

[0021] 2) Power transmission and slagging: Add the following slag-making materials before power transmission. The slag-making material is 9Kg / t of slag returned at the end of converter smelting, (that is, the slag at the end of converter is returned and broken, and its main components are CaO: 45-49%; FeO : 14~20%), ore 1.5Kg / t, fluorite 2Kg / t. Send electricity until the slag is fully melted.

[0022] 3) Power off after the slag is fully melted, increase the flow rate of bottom blowing argon to 800NL / min, use this large volume to stir for 10min, add 1Kg of converter particle steel and 1Kg / t of ore during the stirring process. Fluorit...

Embodiment 2

[0027] Initial phosphorus content of molten steel entering the LF furnace: w(P)%: 0.035%.

[0028] 1) After the molten steel enters the LF furnace, connect the ladle bottom blowing pipe and an external oxygen source, switch to the argon source after 41s of bottom blowing oxygen, and bottom blow argon throughout the refining process.

[0029] 2) Power transmission and slagging: add the following slagging material before power transmission, the slagging material is 9.5Kg / t of converter particle steel, (that is, the slag at the end of the converter is returned and broken, and its main components are CaO: 45-49%; FeO: 14~20%), ore 1.8Kg / t, fluorite 2Kg / t. Send electricity until the slag is fully melted.

[0030] 3) Power off after the slag has melted, increase the flow rate of bottom blowing argon to 830NL / min, use this large volume to stir for 12min, add 1.2Kg / t of converter particle steel and 1.2Kg / t of ore during the stirring process. Fluorite powder 1Kg / t steel spread to the...

Embodiment 3

[0035] The initial phosphorus content of molten steel entering the LF furnace: w(P)%: 0.036%.

[0036] 1) After the molten steel enters the LF furnace, connect the ladle bottom blowing pipe and an external oxygen source, switch to the argon source after 42 seconds of bottom blowing oxygen, and bottom blow argon throughout the refining process.

[0037] 2) Power transmission and slagging: add the following slagging material before power transmission, the slagging material is selected from converter particle steel 10Kg / t, (that is, the slag at the end of the converter is returned to crushing, and its main components are CaO: 45-49%; FeO: 14 ~20%), ore 2.8Kg / t, fluorite 2Kg / t. Send electricity until the slag is fully melted.

[0038] 3) Power off after the slag has melted, increase the bottom blowing argon flow rate to 850NL / min, use this large volume to stir for 15 minutes, add 1.5Kg / t of converter particle steel and 1.5Kg / t of ore during the stirring process. Fluorite powder ...

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Abstract

The invention discloses an LF furnace shallow dephosphorization refining method. The method comprises the following steps that firstly, after molten steel enters an LF furnace, a steel ladle bottom blowing pipe and an external oxygen source are connected, bottom oxygen blowing is carried out, and bottom argon blowing is carried out in the whole refining process; secondly, current delivery and slagging are carried out; thirdly, after slag is molten thoroughly, power is cut off, the bottom argon blowing flow is increased to 800-850 NL/min, stirring is carried out, and dephosphorization is carried out; and fourthly, after dephosphorization is finished, lime is added so as to prevent rephosphorization. Dephosphorization is finished in the LF furnace, molten steel furnace returning is avoided, and the steel making production cost is reduced. Converter terminal point slag returning is mainly adopted to finish dephosphorization, secondary utilization of resources is effectively achieved, and good social benefits and economic benefits are achieved. The molten steel dephosphorization task can be finished only by adopting fluorite, ore, fluorite powder and other conventional materials as the auxiliary dephosphorization materials, the medicament input is little, and cost is saved; and the technology process is simple and clear, operability is high, and control is easy.

Description

technical field [0001] The invention relates to the technical field of steelmaking, in particular to a refining method for shallow dephosphorization in an LF furnace. Background technique [0002] Phosphorus is generally a harmful element in steel, and the dephosphorization method mainly uses converter smelting to remove phosphorus, but converter smelting such as improper process control or slag during tapping can easily cause phosphorus in the ladle to exceed the standard. The conventional rescue method for ladle phosphorus high is to return the molten steel to the converter for secondary treatment to remove phosphorus, which has an adverse impact on steelmaking costs and production efficiency. Contents of the invention [0003] The object of the present invention is to provide a kind of refining method of LF furnace dephosphorization at the problems referred to above, [0004] In order to achieve the above object, the LF furnace dephosphorization refining method provide...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/064
Inventor 汪晛方建红吴本胜黄道昌李相付
Owner 武钢集团有限公司
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