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Arc furnace deep dephosphorization technology and deep dephosphorization agent thereof

A technology of deep dephosphorization agent and electric arc furnace, which is applied in the direction of electric furnace, process efficiency improvement, furnace, etc. It can solve the problems of weak oxygen supply capacity, achieve the effects of reducing oxygen consumption, reducing lime consumption, and saving electric energy

Inactive Publication Date: 2010-11-24
辽宁中汇环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with the converter, the oxygen supply capacity of the electric arc furnace is weaker, and high iron oxide substances are needed for dephosphorization. This process does not add high iron oxide substances

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] An electric arc furnace deep dephosphorization process, including flowing slag to melt steel, deep dephosphorization, and foaming slag. No lime is added before scrap steel is added, and lime and deep dephosphorization agent are added in stages after scrap steel is added until it is completely melted to strengthen the process. Deep dephosphorization effect, the operation steps are as follows:

[0024] 1) After adding all the scrap steel, add lime 18kg / t·steel, after the scrap steel on the slag surface in the furnace is melted, let go of 50% of the slag in the furnace, and then add lime 18kg / t·steel and deep removal Phosphorus 6kg / t·steel;

[0025] 2) Add lime 18kg / t·steel and deep dephosphorization agent 2kg / t·steel again 3 minutes before the scrap steel in the furnace is completely melted;

[0026] 3) Foaming slag operation is carried out in the whole process after the furnace material is melted, and the foaming slag is made by spraying carbon powder and oxygen blowing...

Embodiment 2

[0029] An electric arc furnace deep dephosphorization process, including flowing slag to melt steel, deep dephosphorization, and foaming slag. No lime is added before scrap steel is added, and lime and deep dephosphorization agent are added in stages after scrap steel is added until it is completely melted to strengthen the process. Deep dephosphorization effect, the operation steps are as follows:

[0030] 1) After adding all the scrap steel, add lime 20kg / t·steel, after the scrap steel on the slag surface in the furnace is melted, let go of 50% of the slag in the furnace, add lime 20kg / t·steel and deep slagging Phosphorus 6kg / t·steel;

[0031] 2) Add lime 20kg / t·steel and deep dephosphorization agent 2kg / t·steel again 3 minutes before the furnace material is completely melted;

[0032] 3) Foam slag operation is carried out in the whole process after the furnace material is melted, and the foam slag is made by spraying carbon powder and oxygen blowing, the amount of carbon p...

Embodiment 3

[0035] An electric arc furnace deep dephosphorization process, including flowing slag to melt steel, deep dephosphorization, and foaming slag. No lime is added before scrap steel is added, and lime and deep dephosphorization agent are added in stages after scrap steel is added until it is completely melted to strengthen the process. Deep dephosphorization effect, the operation steps are as follows:

[0036]1) After adding all scrap steel, add lime 22kg / t·steel, after the scrap steel on the slag surface in the furnace melts, let go of 50% of the slag in the furnace, add lime 22kg / t·steel and deep slagging Phosphorus 6kg / t·steel;

[0037] 2) Add lime 22kg / t·steel and deep dephosphorization agent 2kg / t·steel again 3 minutes before the furnace material is completely melted;

[0038] 3) Foam slag operation is carried out in the whole process after the furnace material is melted, and the foam slag is made by spraying carbon powder and oxygen blowing, the amount of carbon powder spr...

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PUM

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Abstract

The invention relates to arc furnace deep dephosphorization technology and a deep dephosphorization agent thereof. The arc furnace deep dephosphorization technology comprises the following steps of: melting steel by using slag, performing deep dephosphorization and preparing foamed slag, and is characterized in that lime and the deep dephosphorization agent are added after the addition of scrap steel and before complete melting of the scrap steel in parts so as to enhance the deep dephosphorization effect. The deep dephosphorization agent consists of the following components in percentage by weight: 25 to 40 percent of lime, and 60 to 75 percent of ferric oxide powder. The method for preparing the dephosphorization agent comprises the following steps of: smashing the raw materials into 100 to 150 meshes and uniformly mixing; and premelting the materials at the high temperature of between 1,200 and 1,550 DEG C, cooling and processing into granules with the diameter of 3 to 50 mm. Compared with the prior art, the invention has the advantages that: the deep dephosphorization technology and the deep dephosphorization agent are adopted for deep dephosphorization, the lime is not added before charging, and the lime and the deep dephosphorization agent are added after charging and before complete melting of the materials in parts to enhance the deep dephosphorization effect, so that the tapping phosphorus is reduced to 0.0030 percent or even lower.

Description

technical field [0001] The invention relates to the technical field of steelmaking in iron and steel metallurgy, in particular to an electric arc furnace deep dephosphorization process and a deep dephosphorization agent thereof. Background technique [0002] With the gradual popularization of electric arc furnace steelmaking, ultra-high power, furnace wall oxygen blowing and high-efficiency continuous casting are the development directions of electric arc furnaces. Some steel mills use mixed use of molten iron and scrap steel, which shortens the smelting cycle of electric arc furnaces and makes The metallurgical function of the electric arc furnace is more compact, and the decarburization and dephosphorization functions need to be completed in a short time; in addition, the steel grades smelted by the electric arc furnace are increasingly developing in the direction of high-precision and sophisticated, and the requirements for harmful elements and inclusions in the steel are ...

Claims

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Application Information

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IPC IPC(8): C21C7/064C21C5/52
CPCY02P10/20
Inventor 陈云天马世德
Owner 辽宁中汇环保科技有限公司
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