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A method for dephosphorizing molten iron using ans-ob refining furnace

A technology of refining furnace and molten iron, which is applied in the field of dephosphorization of molten iron by using ANS-OB refining furnace, can solve the problems that cannot meet the requirements of phosphorus, need more equipment, complex process, etc., achieve low-cost dephosphorization of molten iron, and realize the Effect of dephosphorization and avoiding complex process operation

Active Publication Date: 2016-12-28
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its disadvantage is that it needs more equipment, large investment, complicated process and large heat loss.
Therefore, in order to produce these low-phosphorus and ultra-low-phosphorus steels, conventional smelting methods can no longer meet the phosphorus requirements of these steel types

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Dephosphorization of molten iron using ANS-OB refining furnace:

[0028] 1) Use the special molten iron tank for dephosphorization to transport the molten iron to the slag removal position, and firstly carry out the slag removal treatment on the molten iron. After the slag removal is completed, the temperature of the molten iron is measured and sampled. The measured temperature of the molten iron is 1320°C, and the phosphorus content is 0.065%.

[0029] 2) Transport the molten iron to the ANS-OB refining furnace station, first open the bottom blowing gas valve to blow argon and stir. Then add slagging material into the tank in two batches, the total amount of slagging material added is 25kg / t iron. The content of each component in the slagging material is (Wt%), CaO: 45%; iron oxide: 30%; dolomite: 12%; CaF2: 13%.

[0030] 3) Use the spray gun above the impregnation hood of the ANS-OB refining furnace to blow in oxygen, and the gas flow rate is controlled at 6Nm 3 / h...

Embodiment 2

[0035] Dephosphorization of molten iron using ANS-OB refining furnace:

[0036] 1) Use the special molten iron tank for dephosphorization to transport the molten iron to the slag removal position, and firstly carry out the slag removal treatment on the molten iron. After the slag removal is completed, the molten iron is taken for temperature measurement and sampling. The measured temperature of molten iron is 1301°C, and the phosphorus content is 0.091%.

[0037] 2) Transport the molten iron to the ANS-OB refining furnace station, first open the bottom blowing gas valve to blow nitrogen and stir. Then add slagging material into the tank in 3 batches, and the total amount of slagging material added is 40kg / t iron. The content of each component in the slagging material is (Wt%), CaO: 52%; iron oxide: 25%; dolomite: 14%; CaF2: 9%.

[0038] 3) Use the spray gun above the impregnation hood of the ANS-OB refining furnace to blow air in, and the gas flow rate is controlled at 10Nm...

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Abstract

The invention relates to a method for dephosphorizing molten iron by utilizing an ANS-OB refining furnace. The method for dephosphorizing the molten iron by utilizing the ANS-OB refining furnace concretely comprises the following steps: transporting the molten iron to a slagging-off station to be subjected to slagging-off treatment by adopting a dephosphorized molten iron tank, and measuring temperature of the molten iron and sampling; transporting the molten iron to an ANS-OB refining furnace station, and carrying out gas blowing stirring by opening a bottom blowing gas valve firstly; adding slag materials into the dephosphorized molten iron tank in 1-3 batches, wherein the total quantity of the added slag materials is 20-50kg / t; blowing oxygen or the air into the dephosphorized molten iron tank by utilizing a spray gun above a dipping cover of the ANS-OB refining furnace; and after dephosphorizing is completed, carrying out slagging-off treatment on the molten iron, measuring the temperature of the molten iron and sampling, and carrying out the next process. The method for dephosphorizing the molten iron by utilizing the ANS-OB refining furnace has the advantages that dephosphorizing is carried out on the molten iron by utilizing the original refining furnace in a factory without increasing equipment investment, and a great deal of equipment investment cost and area occupied by equipment in a site are greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of pretreatment of molten iron, and in particular relates to a method for dephosphorizing molten iron by using an ANS-OB refining furnace. Background technique [0002] Phosphorus is usually a harmful element in steel, because phosphorus is easy to segregate at grain boundaries, resulting in cold and brittle steel, phosphorus segregation can also cause anisotropy of steel, reduce welding performance, and cause corrosion fatigue of stainless steel, so most steel types Both require a reduction in phosphorus content. In recent years, with the rapid development of clean steel production technology, the demand for low-phosphorus steel has been raised, such as the production of surface-hardened high-quality alloy steel for automobiles, deep-drawing steel, tinplate, ultra-low carbon steel, bearing steel, high-grade Steel types such as pipeline steel, low temperature steel and marine steel require that w(P) in the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/064
CPCY02P10/20
Inventor 孙群尚德礼康磊李广帮林洋王荣费鹏
Owner ANGANG STEEL CO LTD
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