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Method for preventing molten iron from splashing in KR desulfurization

A technology of molten iron and desulfurization agent is applied in the field of preventing molten iron splashing in KR desulfurization, and can solve the problems of molten iron splashing, economic loss, and viscosity increase of desulfurization slag.

Active Publication Date: 2013-03-20
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a method for preventing molten iron from splashing in KR desulfurization, and to solve the existing problems in the existing molten iron desulfurization treatment process, that is, after the condition of molten iron deteriorates, the molten iron is caused by Si, Ti, etc. in the molten iron. The viscosity increases, and the viscosity of the desulfurization slag increases, which will easily lead to molten iron splashing during the KR desulfurization process, causing economic losses and affecting the production rhythm.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The method for preventing molten iron from splashing during KR stirring provided by Embodiment 1 of the present invention comprises the following steps:

[0027] 1) Control the temperature of molten iron entering the KR station to 1350°C;

[0028] 2) Control the clearance of molten iron to 900mm at the station;

[0029] 3) Before KR desulfurization, remove the molten iron slag, and the amount of slag removed is 90%;

[0030] 4) The mass fraction of KR desulfurizer is 90% CaO+10% CaF 2 , the desulfurization agent is reduced by 1.2%, and the amount of desulfurization agent added is 1.8t;

[0031] 5) The desulfurization catalyst has an Al content of 30-40%, Al 2 o 3 Aluminum slag with a content of 60-70% is added in an amount of 120kg;

[0032] 6) When the desulfurizer is added, control the rotation speed of the stirring head to 40rpm;

[0033] 7) When stirring, control the speed of the stirring head to 70-100rpm, and the stirring time is 6min;

[0034] 8) Control t...

Embodiment 2

[0037] The method for preventing molten iron from splashing during KR stirring provided by Embodiment 2 of the present invention comprises the following steps:

[0038] 1) Control the temperature of molten iron entering the KR station to 1320°C;

[0039] 2) Control the clearance of molten iron to 950mm at the station;

[0040] 3) Before KR desulfurization, remove the molten iron slag, and the amount of slag removed is 92%;

[0041] 4) The mass fraction of KR desulfurizer is 90% CaO+10% CaF 2 , the amount of desulfurization agent added is 3t, and the desulfurization agent is burned by 1.0%;

[0042] 5) Use desulfurization catalyst. The desulfurization catalyst has an Al content of 30-40%, Al 2 o 3 Aluminum slag with a content of 60-70% is added in an amount of 180kg;

[0043] 6) When the desulfurizer is added, control the rotation speed of the stirring head to 60rpm;

[0044] 7) When stirring, control the speed of the stirring head to 70-100rpm, and control the stirring ...

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PUM

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Abstract

The invention discloses a method for preventing molten iron from splashing in KR desulfurization. The method comprises the following steps of: controlling the generation of gas in the desulfurization process, and controlling the viscosity of molten iron, wherein the step of controlling the generation of gas in the desulfurization process comprises the steps of controlling the ignition loss of a desulfurizing agent, reducing the source of gas CO / CO2 in the desulfurizing agent, and reacting the desulfurizing agent with oxide in the slag in the presence of a desulfurizing catalyst to reduce the oxidability of slag and lower the generation of gas CO / CO2; and the step of controlling the viscosity of molten iron comprises a step of removing the molten iron slag before desulfurization. The method for preventing molten iron from splashing in KR desulfurization provided by the invention solves the problems in the existing molten iron desulfurization treatment technology that the viscosity of molten iron and the viscosity of the desulfurization slag are both increased due to Si, Ti and the like in the molten iron, the molten iron easily splashes in the KR desulfurization process and consequently economic loss is caused and the production rhythm is influenced after the conditions of the molten iron deteriorate, and therefore the splashing of molten iron is prevented in the KR desulfurization process.

Description

technical field [0001] The invention relates to the technical field of molten iron pretreatment in iron and steel metallurgy, in particular to a method for preventing molten iron from splashing in KR desulfurization. Background technique [0002] With the deterioration of blast furnace ores, coke and other materials, due to cost considerations, ores with more impurities are often used for smelting molten iron in ironmaking, which leads to deterioration of molten iron conditions and increases the difficulty of KR desulfurization pretreatment. In the traditional steelmaking production process, KR desulfurization is used, and the mass fraction of S at the end point can reach 0.0010% or less. However, after the condition of molten iron deteriorates, the viscosity of molten iron increases due to Si, Ti, etc. in the molten iron, and the viscosity of desulfurization slag increases, which is easy As a result, molten iron splashes during the KR desulfurization process, causing econom...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C1/02
Inventor 高攀崔园园王飞崔阳朱国森曹勇
Owner SHOUGANG CORPORATION
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