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Titanium-containing molten iron converter dephosphorization method

A dephosphorization and molten iron technology, applied in the field of converter steelmaking, can solve the problem of low dephosphorization rate

Inactive Publication Date: 2021-03-30
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The embodiment of the present invention provides a method for dephosphorizing titanium-containing molten iron to solve the technical problem of low dephosphorization rate in the smelting of titanium-containing molten iron in the prior art

Method used

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  • Titanium-containing molten iron converter dephosphorization method
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  • Titanium-containing molten iron converter dephosphorization method

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Embodiment 1 to Embodiment 5

[0075] Embodiments 1 to 5 provide a method for dephosphorizing titanium-containing molten iron in a converter. The smelted steel type is HRB400, and its 0.015%

[0076] Step 1, according to the content of Si and Ti in the titanium-containing iron water to be smelted, determine the amount of slag left in the converter of the previous furnace;

[0077] For example 1, the Si content of the titanium-containing molten iron to be smelted is 0.18%, and the Ti content is 0.15%, so the operation of leaving slag in the previous furnace is to leave all slag. The converter slag temperature of the previous furnace was 1560℃.

[0078] For example 2, the Si content of the titanium-containing molten iron to be smelted is 0.25%, and the Ti content is 0.22%. Therefore, according to the operation requirements in Table 1, the slag operation of the previous furnace is all slag. The converter slag temperature of the previous furnace was 1580℃.

Embodiment 3

[0079] In Example 3, the Si content of the titanium-containing molten iron to be smelted is 0.40%, and the Ti content is 0.23%. Therefore, according to the operation requirements in Table 1, the slag retention operation of the previous furnace is all slag retention. The converter slag temperature of the previous furnace was 1540℃.

Embodiment 4

[0080] In Example 4, the Si content of the titanium-containing molten iron to be smelted is 0.44%, and the Ti content is 0.35%. Therefore, according to the operation requirements in Table 1, the slag retention operation of the previous furnace is 1 / 2 of the slag retention. The converter slag temperature of the previous furnace was 1550℃.

[0081] Step 2: Add steel scrap and molten iron into the converter with the amount of slag left determined in step 1, and carry out the first stage of smelting. The smelting time of the first stage is 3 minutes, and the raw material loading structure is shown in Table 4.

[0082]In the first stage of smelting, lime and raw white slag were added, while oxygen was blown from the top and nitrogen was blown from the bottom for stirring. The addition amount of lime and raw burnt dolomite, oxygen supply and bottom blowing conditions are shown in Table 5. The oxygen lance adopts a four-hole oxygen lance nozzle, and the angle parameters between the ...

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Abstract

The invention provides a titanium-containing molten iron converter dephosphorization method, which comprises the following steps of obtaining the Nth converter slag; wherein in the Nth converter slag,the mass fraction of FeO is 15-25%; mixing the converter slag of the Nth converter, titanium-containing molten iron to be smelted and scrap steel, and top-blown oxygen at the flow rate of 2.95-3.35 Nm < 3 > / min / t is used to carry out first-stage smelting to obtain smelted molten steel; and the flow of top-blown oxygen of the smelted molten steel is increased to a target value, conducting second-stage smelting, obtaining the converter slag of the N+1th converter and dephosphorized molten steel, and N is a positive integer. By adopting the method provided by the invention, the dephosphorizationrate of the titanium-containing molten iron can reach 80.31-90.70%, and the iron content of the converter slag at the smelting end point of the converter is obviously reduced.

Description

technical field [0001] The invention belongs to the technical field of converter steelmaking, and in particular relates to a method for dephosphorizing titanium-containing molten iron in a converter. Background technique [0002] The titanium content in titanium-containing iron water can generally be as high as about 0.7%. On the one hand, it is due to the use of titanium ore or titanium balls to protect the blast furnace to achieve the purpose of long life of the blast furnace, resulting in titanium in the molten iron; Economical charge structure, blast furnace consumes a large amount of local cheap vanadium and titanium balls, resulting in high content of titanium (0.10-0.50%), vanadium (0.05-0.10%) and chromium (0.10-0.20%) in molten iron. [0003] At present, the converter smelting titanium-containing molten iron adopts double slag operation, that is, in the process of converter smelting, the smelting process is carried out by pouring the furnace and slag, and then addin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C1/02C21C7/064
CPCC21C1/02C21C7/064
Inventor 孔祥涛杨龙飞吕延春伍从应周德杨昌涛蓝桂年文安义刘珂李鸿荣孙齐松江金东游建刘占林
Owner SHOUGANG CORPORATION
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