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Top blowing lance for refining and method for refining molten iron using the same

A molten iron and top-blowing technology, which is applied in furnaces, electric charge control, manufacturing converters, etc., can solve problems such as nozzle blockage for secondary combustion, inability to use top-blowing lances, and inability to obtain top-blowing lances, etc., and achieve iron yields Improvement, efficient oxidation refining, and productivity improvement effects

Active Publication Date: 2014-10-01
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] As a top-blowing lance for carrying out such refining, if the above-mentioned existing top-blowing lances of various shapes are verified, it will be found that any one of them cannot be used.
And, even if the above-mentioned existing top-blown spray guns are combined, it is impossible to obtain a top-blown spray gun that can meet the requirements.
For example, even if the post-combustion nozzle proposed in Patent Document 4 is connected to the oxygen-containing gas supply path of the top blowing lance proposed in Patent Document 3, if the oxygen-containing gas is sent together with the oxygen-containing gas through the oxygen-containing gas supply path If the flux is used, there will be a problem that the nozzle for secondary combustion will be clogged by the flux.

Method used

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  • Top blowing lance for refining and method for refining molten iron using the same
  • Top blowing lance for refining and method for refining molten iron using the same
  • Top blowing lance for refining and method for refining molten iron using the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] The molten iron discharged from the blast furnace is transported to a converter with a capacity of 300 tons after it is desiliconized using the cast bed of the blast furnace as required, and is utilized in the converter figure 1 The top-blown lance shown has been subjected to a total of four preliminary dephosphorization treatments (Examples 1 to 4 of the present invention). In addition, four main hole nozzles are arranged concentrically and uniformly. In addition, 8 nozzles for secondary combustion are arranged up and down in a concentric circle, and the angle θ (°) formed between the nozzles for secondary combustion and the top blowing lance makes the oxygen injection from the nozzles for secondary combustion The distance X (m) from the nozzle exit of the nozzle 13 for secondary combustion when the flow velocity of the stream reaches 30 m / sec satisfies the following formula (2).

[0072] [mathematical formula 2]

[0073] 0.10 ≤ ...

Embodiment 2

[0085] The molten iron discharged from the blast furnace is transported to a converter with a capacity of 300 tons after it is desiliconized using the cast bed of the blast furnace as required, and is utilized in the converter image 3 The shown top-blown lance was subjected to a total of two preliminary dephosphorization treatments (Examples 5-6 of the present invention).

[0086] In the dephosphorization process, the flow rate of oxygen from the nozzle for secondary combustion is controlled to be constant. O ) is the percentage of 100Q / Q O 12%. In this case, Xsin can also be confirmed

[0087] θ is in a range satisfying the above formula (2). Other dephosphorization treatment conditions were set to the same conditions as in Example 1. Table 2 shows the components and operating conditions of the molten iron before and after the dephosphorization treatment. The unit time consumption of CaO and the usage amount of solid oxygen source in Table 2 are the amounts per 1 ton of...

Embodiment 3

[0092] The molten iron discharged from the blast furnace is transported to a converter with a capacity of 300 tons after it is desiliconized using the cast bed of the blast furnace as required, and is utilized in the converter figure 1 and image 3 The top blowing lance shown has been subjected to preliminary dephosphorization treatment (Examples 7-8 of the present invention).

[0093] As a stirring gas, oxygen is fed from the tuyeres at the bottom of the converter at a rate of 0.3Nm per 1 ton of molten iron 3 / min flow blown in. The tuyeres at the bottom of the furnace are formed with a double-tube structure, and oxygen is blown in from the inner tube, and propane gas is blown in from the outer tube as cooling gas according to the flow rate of oxygen. Sintered ore (average particle size: 100 μm) of 6 kg of iron ore per 1 ton of molten iron was used as a solid oxygen source, and the solid oxygen source was sprayed from the sub-orifice nozzle of the pre-blow lance. The condi...

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Abstract

The invention provides a top-blowing lance for refining, which has a main orifice nozzle (11) and a secondary orifice nozzle (12) for blowing vertically downward or obliquely downward at the front end of the lance, and is isolated from the front end at the top The side portion of the spray gun at the place has a horizontal or obliquely downward direction secondary combustion nozzle (13), and inside the top blowing spray gun has: a first supply path, which is used to pass through the above-mentioned main hole nozzle For supplying a powder other than a solid oxygen source together with the oxygen-containing gas for blowing, or for supplying the oxygen-containing gas for blowing through the above-mentioned main hole nozzle; for supplying the secondary combustion through the above-mentioned nozzle for secondary combustion The second supply path of the oxygen-containing gas; and the third supply path for supplying the powdery solid oxygen source together with the conveying gas through the above-mentioned sub-hole nozzle, when the molten iron or molten steel is thereby oxidized and refined , can carry out effective oxidation refining, and can effectively melt the attached pig iron block of the converter type refining vessel at the same time.

Description

technical field [0001] The present invention relates to a top-blowing lance (top lance) for refining, and further relates to a method for refining molten iron using the top-blowing lance, wherein, preferably, the top-blowing lance for refining is used for refining iron in a converter type refining vessel. Oxidation refining (oxidation refining) such as dephosphorization treatment (dephosphorization treatment: dephosphorization treatment) is performed on hot metal (hot metal: molten iron) or molten steel. In the top blowing lance of the present invention, since the supply path of the oxygen containing gas is separated from the supply path of the solid oxygen source (solid oxygen source) such as iron oxide, it is possible to flow from these paths to the molten iron in the converter type refining vessel. Or the liquid surface of molten steel is independently supplied with oxygen-containing gas and solid oxygen source. Furthermore, the top blowing lance of the present invention c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/46C21C1/02
CPCC21C7/072C21C7/068C21C5/32C21C5/36C21C1/02C21C5/4613F27D3/18C21C5/305F27D3/16C21C5/46
Inventor 内田祐一小笠原太加藤规泰古家雅之五十岚佑马
Owner JFE STEEL CORP
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