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A method for controlling the amount of sulfur returned in converter smelting

A converter smelting and content technology

Active Publication Date: 2017-01-04
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 application provides a method for controlling the amount of sulfur returned in converter smelting, which is used to solve the technical problem existing in the prior art that the amount of sulfur returned when using KR for molten iron converter smelting is large

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1 of the present invention proposes a method for controlling the amount of sulfur returned in converter smelting, using KR molten iron pretreatment, and 300 tons of top-bottom combined blowing converter for smelting. The specific process of the method is as follows:

[0025] Step a: Pretreatment and desulfurization of molten iron by KR, wherein the content of S in the molten iron after KR desulfurization is 0.0002wt%.

[0026] In the specific implementation process, the molten iron produced by the blast furnace is pretreated and desulfurized by KR, and the S content in the molten iron after the KR desulfurization is controlled to 0.0002wt%, so that the S content in the molten iron after the KR desulfurization treatment is reduced.

[0027] Step b: Slagging off the molten iron after KR desulfurization, wherein the desulphurization slag removal rate after the slagging treatment is 99%.

[0028] In the specific implementation process, the slag removal treatment ...

Embodiment 2

[0038] Embodiment 2 of the present invention proposes a method for controlling the amount of sulfur returned in converter smelting, using KR molten iron pretreatment, 300 tons of top-bottom combined blowing converter for smelting, the specific process of the method is as follows:

[0039] Step a: Pretreatment and desulfurization of molten iron by KR, wherein the content of S in the molten iron after KR desulfurization is 0.0008wt%.

[0040] In the specific implementation process, the molten iron refined in the blast furnace is pretreated and desulfurized by the KR, and the S content in the molten iron after the KR desulfurization is controlled to be 0.0008wt%.

[0041] Step b: Slagging treatment is performed on the molten iron after KR desulfurization, wherein the removal rate of desulfurization slag after the slagging treatment is 97%.

[0042] In the specific implementation process, the slag removal treatment is carried out on the molten iron after KR desulfurization, and th...

Embodiment 3

[0052] Embodiment 3 of the present invention proposes a method for controlling the amount of sulfur returned in converter smelting, using KR molten iron pretreatment, and 300 tons of top-bottom combined blowing converter for smelting. The specific process of the method is as follows:

[0053] Step a: Pretreatment and desulfurization of molten iron by KR, wherein the content of S in the molten iron after KR desulfurization is 0.0010wt%.

[0054] In the specific implementation process, the molten iron produced by the blast furnace is pretreated and desulfurized by the KR, and the S content in the molten iron after the desulfurization by the KR is controlled to be 0.0010wt%.

[0055] Step b: Slagging treatment is performed on the molten iron after KR desulfurization, wherein the removal rate of desulfurization slag after the slagging treatment is 95%.

[0056] In the specific implementation process, the slag removal treatment is carried out on the molten iron after KR desulfuriza...

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Abstract

The invention discloses a method for controlling the amount of sulfur returned in converter smelting. KR is used to pretreat and desulfurize molten iron, wherein the S content in molten iron after KR desulfurization is 0.0002wt% to 0.0010wt%, and then the S content after KR desulfurization is completed The molten iron is subjected to slag removal treatment, wherein the removal rate of desulfurization slag after the slag removal treatment is 95% to 99%, and 1 to 3kg / t of molten iron lime is added to the molten iron after the slag removal treatment, and then the molten iron is poured into the converter for smelting, wherein the content of S in the molten steel after the converter smelting is 0.0016wt%-0.0030wt%.

Description

technical field [0001] The invention relates to the field of smelting, in particular to a method for controlling the amount of sulfur returned in converter smelting. Background technique [0002] With the continuous development of iron and steel smelting technology, and the downstream products have higher and higher requirements on steel quality, it is necessary to make the steel have a lower content of sulfur (S). In the prior art, KR is generally used for desulfurization pretreatment, so that the content of S in the molten iron after KR desulfurization treatment can reach 0.0010wt% or less, and then the molten iron after KR treatment is poured into the converter for smelting, so that the converter smelts out The content of S in the molten steel is reduced, thereby improving the quality of the steel. [0003] However, in the prior art, when the molten iron after KR desulfurization treatment is poured into the converter for smelting, due to reasons such as desulfurization s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C1/02C21C5/28
Inventor 高攀李海波朱国森陈斌赵东伟王飞
Owner SHOUGANG CORPORATION