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A kind of foaming agent used in the molten iron pretreatment process, its preparation method and application

A technology of molten iron pretreatment and foaming agent, which is applied in the field of iron and steel metallurgy, can solve the problems that have not been popularized and applied, and the effect of removing liquid scum is not ideal, so as to shorten the time for removing slag, achieve considerable economic benefits, and reduce the iron loss of slag removal Reduced effect

Active Publication Date: 2019-06-28
MAANSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the unsatisfactory effect of removing liquid scum in the later stage, it has not been popularized and applied.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A foaming agent used in the pretreatment process of molten iron includes the following raw materials in weight percentages: calcium carbonate 10%, graphite 8%, and quartz sand 82%. The preparation method is: after mixing the raw materials according to the formula ratio, they are crushed into Particles with a particle size ≤ 10mm.

[0033] The application of the foaming agent to the molten iron pretreatment process can significantly reduce the iron loss and shorten the slag removal time in the molten iron pretreatment process. The specific operation method is as follows:

[0034] 1) During the injection process, add 200 kg of foaming agent to the top slag of the 100t molten iron ladle 2 minutes before the end of powder injection and desulfurization;

[0035] 2) Wait for 1 minute after the desulfurization is completed to make the desulfurization slag fully foam;

[0036] 3) Remove the first slag; remove the foamed and agglomerated desulfurization slag until there is no foaming lu...

Embodiment 2

[0041] A foaming agent used in the pretreatment of molten iron includes the following raw materials in weight percentages: sodium carbonate 8%, carbon powder 12%, and quartz sand 80%. The preparation method is as follows: after mixing the raw materials according to the formula ratio, crushing Into particles with a particle size ≤ 10mm.

[0042] The application of the foaming agent to the molten iron pretreatment process can significantly reduce the iron loss and shorten the slag removal time in the molten iron pretreatment process. The specific operation method is as follows:

[0043] 1) During the injection process, add 250kg of foaming agent to the top slag of 100t hot metal ladle 2 minutes before the end of powder injection and desulfurization;

[0044] 2) Wait for 1.5 minutes after the desulfurization is completed to make the desulfurization slag fully foam;

[0045] 3) Remove the first slag; remove the foamed and agglomerated desulfurization slag until there is no foaming lumps f...

Embodiment 3

[0050] A foaming agent used in the pretreatment process of molten iron includes the following raw materials in weight percentages: 15% magnesium carbonate, 10% coke, 50% quartz sand, and 25% river sand. The preparation method is as follows: After mixing, it is broken into particles with a particle size ≤ 10mm.

[0051] The application of the foaming agent to the molten iron pretreatment process can significantly reduce the iron loss and shorten the slag removal time in the molten iron pretreatment process. The specific operation method is as follows:

[0052] 1) During the injection process, add 120kg of foaming agent to the top slag of the 60t molten iron ladle 2 minutes before the end of powder injection and desulfurization;

[0053] 2) Wait for 2 minutes after the desulfurization is completed to make the desulfurization slag fully foam;

[0054] 3) Remove the first slag; remove the foamed and agglomerated desulfurization slag until there is no foaming lumps floating;

[0055] 4) Aft...

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Abstract

The invention discloses a foaming agent used in a liquid iron pretreatment process as well as a preparation method and an application of the foaming agent. The foaming agent comprises raw materials inpercentage by weight as follows: 5%-20% of a foaming material, 5%-12% of a carbon substance and 75%-90% of a silicon dioxide material. The preparation method of the foaming agent comprises the following steps: the raw materials are mixed in the formula ratio and broken into granules with grain size smaller than or equal to 10 mm. With adoption of the foaming agent used in the liquid iron pretreatment process, slagging-off iron loss in the liquid iron pretreatment process can be reduced remarkably, the slagging-off time can be shortened remarkably, on the premise that the investment of liquidiron pretreatment is not increased, the slagging-off time can be shortened by 1-2 min, the slagging-off iron loss can be reduced by 3-6 kg of iron per ton, and substantial economic benefits are realized.

Description

Technical field [0001] The invention belongs to the field of iron and steel metallurgy, and specifically relates to a foaming agent used in the pretreatment process of molten iron, its preparation method and application. Background technique [0002] During the hot metal pretreatment process, the molten iron slag contains a large amount of desulfurization products, and the slag is not clean after the pretreatment. The sulfur in the molten iron slag returns to the molten steel during the converter blowing process, causing the molten iron pretreatment to lose the application of metallurgical effects. In addition to the use of high-quality raw materials and slagging materials to reduce the sulfur return of molten steel in the smelting process, whether the desulfurization slag after hot metal pretreatment can be quickly cleaned is also a crucial metallurgical method to control the sulfur return of molten steel. At present, molten iron desulfurization slag is basically removed by a sl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C1/02
Inventor 沈昶郭俊波张晓峰陆强孙彪舒宏富潘远望王勇
Owner MAANSHAN IRON & STEEL CO LTD
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