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Desulfurizing accelerator for molten iron pretreatment and application thereof

A desulfurization accelerator and molten iron pretreatment technology, which is applied in the field of metallurgical engineering, can solve the problems of desulfurization slag foaming and aggregation rarely mentioned in the process of slag removal, and achieve simple and easy process methods, fast slag removal, and added The effect of simple process

Inactive Publication Date: 2019-06-28
SHANDONG IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] To sum up, some of the above patent applications are all aimed at the design and process of desulfurization agents for molten iron desulfurization, and rarely mention the slag melting process, desulfurization slag foaming and aggregation in the desulfurization process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] KR desulfurization process, 120t molten iron tank, the actual amount of molten iron is 117.55t, the temperature of the incoming molten iron is 1420°C, and the S content of the molten iron is 0.037%.

[0033] The ore raw material composition (wt%) of the desulfurization accelerator in this embodiment is: 55% of aluminum slag, 20% of Bayer process red mud, 12% of sintering process red mud, and 13% of LF refining waste residue.

[0034] The added desulfurization accelerator composition is: Al: 12.5%, Al 2 o 3 : 51.2%, Si: 9.5%, CaO: 7.8%, Na 2 O: 3.5%, Fe: 1.3%, (S+P): 1.6%, and other components are unavoidable impurities.

[0035] After the molten iron tank enters the material level, add the molten iron pretreatment desulfurization accelerator according to the present invention and add passivation lime at the same time and stir. Add 0.03 kg for every 10 ppm sulfur. After the passivation lime and desulfurization accelerator are added at the same time, the high-speed st...

Embodiment 2

[0037]Magnesium pellet desulfurization, 110t molten iron tank, incoming molten iron temperature is 1390℃. The S content of molten iron is 0.029%.

[0038] The ore raw material components (wt%) of the desulfurization accelerator in this embodiment are: 40% of aluminum slag, 30% of Bayer process red mud, 10% of sintering process red mud, and 20% of LF refining waste residue.

[0039] The added desulfurization accelerator composition is: Al: 6.5%, Al 2 o 3 : 42%, Si: 7.5%, CaO: 12.5%, Na 2 O: 4.5%, Fe: 4.5%, (S+P): 1.5%, and other components are unavoidable impurities.

[0040] After desulfurization by spraying magnesium pellets in a 110t molten iron tank, add a desulfurization accelerator while adding magnesium pellets, the ratio of the two is 8:2, and the total amount of addition is 1350kg. The pressure is 0.15Mpa and the injection time is 8 minutes; after the stirring is completed, follow-up procedures are carried out according to the routine. The results show that the S c...

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Abstract

The invention belongs to the field of metallurgical engineering, and particularly relates to a desulfurizing accelerator for molten iron pretreatment and an application thereof. The raw materials of the desulfurizing accelerator for molten iron pretreatment comprises the following, by weight 35%-70% of aluminum slag, 10%-35% of Bayer process red mud, 5%-30% of sintering process red mud and 0%-25%of LF refining waste slag. The chemical components comprise the following, by weight 1.5%-15% of Al, 15%-80% of Al2O3, less than or equal to 15% of SiO2, 2%-15% of CaO, 1.0-15% of Na2O, less than or equal to 5% of Fe, less than or equal to 2.0% of S and P, and other components are inevitable impurities. When the desulfurizing accelerator for molten iron is applied, the process method is simple andfeasible, the slagging and slagging speed is high, and the desulfurization efficiency is high; according to the desulfurizing accelerator, the use amount of passivated lime is obviously reduced, andthe consumption of the passivated lime is reduced by more than 12% by applying the desulphurization promoter for molten iron pretreatment.

Description

technical field [0001] The invention belongs to the field of metallurgical engineering, and in particular relates to a molten iron pretreatment desulfurization accelerator and its application, which is mainly used in the production of the molten iron pretreatment desulfurization process. Background technique [0002] With the rapid development of hot metal pretreatment technology, desulfurization in the hot metal pretreatment process can not only improve the desulfurization efficiency, but also provide better raw material conditions for the converter steelmaking process. Currently widely used hot metal pretreatment desulfurization is mainly KR process and magnesium particle injection. However, for various metallurgical manufacturers, due to the constraints of various conditions such as process, equipment, environment, and space, the desulfurization efficiency fluctuates greatly. How to maximize the desulfurization efficiency has become the focus of the hot metal pretreatmen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C1/02
CPCY02P10/20
Inventor 张思勋王强王兆存王建景
Owner SHANDONG IRON & STEEL CO LTD
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