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A kind of steelmaking desulfurization agent and its desulfurization method and steelmaking method

A desulfurization agent and formula technology, applied in the field of iron and steel smelting, can solve the problems of high desulfurization pressure and insufficient effect, and achieve the effects of eliminating pollution, reducing refining desulfurization pressure, and simple ingredients

Active Publication Date: 2018-03-27
CHENGDE JIANLONG SPECIAL STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the effect of desulfurization by desulfurizer is not obvious enough, and the desulfurization pressure is still high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A kind of desulfurizer, described desulfurizer is made up of following raw material according to the weight ratio of each raw material and molten iron:

[0041] Fluorite 1kg / tFe

[0042] Lime 9kg / tFe

[0043] Aluminum shot 0.25kg / tFe.

[0044] A steelmaking method, the steelmaking method firstly extracts vanadium and then desulfurizes, and the desulfurization adopts the KR stirring method for desulfurization. Among them, the vanadium extraction is carried out on the converter, the amount of molten iron in the converter is 68t, the clearance of the semi-ladle is 800mm, the blowing time of the vanadium extraction process is 5min, the temperature of the semi-steel obtained after vanadium extraction is controlled at 1400°C, and the KR During desulfurization by stirring method, the temperature of the semi-steel is 1370°C, the stirring speed is 85r / min, and the stirring time is 16min. Formulated amount of aluminum pellets; the desulfurized semi-steel is then subjected to c...

Embodiment 2

[0047] A kind of desulfurizer, described desulfurizer is made up of following raw material according to the weight ratio of each raw material and molten iron:

[0048] Fluorite 2kg / tFe

[0049] Lime 8kg / tFe

[0050] AD powder 3.3kg / tFe.

[0051] A steelmaking method, the steelmaking method firstly extracts vanadium and then desulfurizes, and the desulfurization adopts the KR stirring method for desulfurization. Among them, the vanadium extraction is carried out on the converter, the amount of molten iron in the converter is 70t, the clearance of the semi-ladle is 600mm, the blowing time of the vanadium extraction process is 4.5min, and the temperature of the semi-steel obtained after vanadium extraction is controlled at 1390°C. During desulfurization by the KR stirring method, the temperature of the semi-steel is 1360°C, the stirring speed is 75r / min, and the stirring time is 20min. When desulfurizing, first add lime and fluorite in the formula amount to the semi-steel after...

Embodiment 3

[0054] A kind of desulfurizer, described desulfurizer is made up of following raw material according to the weight ratio of each raw material and molten iron:

[0055] Fluorite 1.5kg / tFe

[0056] Lime 8.5kg / tFe

[0057] Aluminum particles and AD powder 2.0kg / tFe.

[0058] A steelmaking method, the steelmaking method firstly extracts vanadium and then desulfurizes, and the desulfurization adopts the KR stirring method for desulfurization. Among them, the vanadium extraction is carried out on the converter, the amount of molten iron in the converter is 69t, the clearance of the semi-ladle is 500mm, the blowing time of the vanadium extraction process is 4min, the temperature of the semi-steel obtained after vanadium extraction is controlled at 1360°C, and the KR During desulfurization by stirring method, the temperature of the semi-steel is 1330°C, the stirring speed is 80r / min, and the stirring time is 15min. Formulated amount of aluminum particles and AD powder; the desulfur...

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PUM

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Abstract

The invention provides a steelmaking desulfurizer and its desulfurization method and steelmaking method. The desulfurizer is mainly composed of the following raw materials according to the weight ratio of each raw material to molten iron: 1-2kg / tFe fluorite; 8-9kg / tFe tFe lime; 0.25-3.3kg / tFe aluminum particles and / or AD powder; the steelmaking method adopts the process route of first extracting vanadium and then desulfurizing. The desulfurizer can deoxidize semi-steel while desulfurizing, greatly reducing the pressure of refining desulfurization, reducing the sulfur content in the finished steel to below 0.002%, and the desulfurizer has simple components and is easy to use; The steelmaking method completely eliminates the problem of vanadium slag being polluted.

Description

technical field [0001] The invention belongs to the technical field of iron and steel smelting, and in particular relates to a steel-making desulfurization agent, a desulfurization method and a steel-making method. Background technique [0002] After vanadium-containing iron ore is smelted into vanadium-containing molten iron, it is usually necessary to extract vanadium before steelmaking. As an important vanadium-containing iron ore, vanadium-titanium magnetite has huge reserves in my country. Enterprises such as Panzhihua Iron and Steel, Chenggang, Kunming Iron and Steel, and Weiyang Iron and Steel all use vanadium-titanium magnetite for smelting. Compared with ordinary molten iron, the molten iron smelted from vanadium-titanium-magnetite blast furnace has higher vanadium content, and vanadium is an important resource. Therefore, vanadium must be extracted from molten iron to produce vanadium slag before steelmaking. At present, there are many production methods for prod...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/064
Inventor 张国东王大鹏董诗朋李澍范富华冯晓明谢勇丁闯张帆
Owner CHENGDE JIANLONG SPECIAL STEEL