Molten iron desulphurization method for molten iron mixing process

A technology for hot metal desulfurization and molten iron, which is applied in the field of hot metal desulfurization in the process of adding molten iron, can solve problems such as easy entry of desulfurization slag into the ladle, difficult removal of desulfurization slag, and poor kinetic conditions, so as to enhance process matching ability and production operation The effect of low cost and long desulfurization duration

Active Publication Date: 2015-05-06
德龙钢铁有限公司
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  • Summary
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Problems solved by technology

[0004] Patent documents CN 101649367A and CN 100482809C, which disclose the method of injecting desulfurizer with carrier gas to realize desulfurization of molten iron in the mixed iron furnace / car. In this method, the mixed iron furnace / car is used as a single molten iron container for desulfurization, and the dynamic conditions are not Well, there is a dead zone, the efficiency is not high, and during the process of adding iron to the ladle, desulfurization slag easily enters the ladle, causing sulfur to return to the converter process. At the same time, the removal of desulfurization slag in the mixing furnace / car is also a big problem

Method used

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Examples

Experimental program
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Effect test

Embodiment example 1

[0025] The composition of molten iron in the mixer furnace is C: 0.41%, Si: 0.38%, Mn: 0.18%, S: 0.049%, P: 0.082%. The mixing rate of molten iron in the molten iron mixing furnace is 320kg / s, the temperature of the molten iron is 1350°C, and the molten iron ladle is planned to hold 120t of molten iron. The entire process of adding molten iron takes about 6.2 minutes.

[0026] In the process of mixing molten iron in the mixing furnace, 1mm to 3mm of pre-melted desulfurizer is continuously added to the impact area of ​​molten iron in the ladle. The main components of the desulfurizer are CaO: 68%, SiO 2 : 2.5%, MgO: 3.5%, CaF 2 :1.8%, Al 2 o 3 : 10%; Melting point 1275°C. The addition rate of desulfurizer is 0.81kg / s, equivalent to 2.5kg / t iron consumption per ton 铁 .

[0027] After the iron has been blended, the molten iron ladle is hoisted to the slag removal station with a crane, and 95% of the slag on the surface of the molten iron is quickly removed. After treatment, ...

Embodiment example 2

[0029] The composition of molten iron in the mixing furnace is C: 0.40%, Si: 0.35%, Mn: 0.15%, S: 0.035%, P: 0.105%. The mixing rate of molten iron in the molten iron mixing furnace is 280kg / s, the temperature of the molten iron is 1375°C, and the molten iron ladle is planned to hold 80t of molten iron. The entire process of mixing the molten iron takes about 4.8 minutes.

[0030] In the process of adding molten iron to the mixing furnace, continuously add 1mm to 5mm self-prepared desulfurizer to the impact area of ​​molten iron in the ladle, and the desulfurizer (lime: fluorite: aluminum particles = 8:0.7:1.3) totals 280kg. The adding rate of desulfurizer is 1.0kg / s, equivalent to 3.5kg / t iron consumption per ton 铁 .

[0031] After the iron has been blended, the molten iron ladle is hoisted to the slag removal station with a crane, and 93% of the slag on the surface of the molten iron is quickly removed. After treatment, the sulfur content of the molten iron is 0.007%, and t...

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Abstract

The invention discloses a molten iron desulphurization method for a molten iron mixing process, and belongs to the technical field of molten iron preprocessing. A process of adding molten iron into a molten iron ladle from an iron mixing furnace / car is utilized as the desulphurization reaction time of the molten iron in a molten pool and the potential energy of the molten iron is utilized as the stirring power of the molten pool; a granular desulphurization agent with the proportion the same as the iron output quantity is continuously added in a molten iron mixing impact region through a simple device, so that the best desulphurization environment is created in the molten iron mixing impact region during the whole dynamic molten iron mixing process; when the sulfur-containing molten iron flowing at high speed enters the molten pool of the molten iron, quick and efficient desulphurization is achieved. The method is high in desulphurization efficiency, simple in process, easy and convenient to operate and low in process cost.

Description

technical field [0001] The invention belongs to the technical field of molten iron pretreatment, in particular to a method for desulfurizing molten iron in the process of adding molten iron. Background technique [0002] As the market continues to slump, iron and steel enterprises have changed from the previous extensive expansion model to a sustainable development model that focuses on cost and efficiency. On the one hand, iron and steel enterprises are becoming more and more cautious about the investment in new equipment, and on the other hand, they are vigorously carrying out cost reduction and efficiency enhancement work in various links to strengthen the competitiveness of enterprises. At present, the control of sulfur content in molten iron is mainly divided into three types: internal sulfur control of blast furnace, desulfurization pretreatment of molten iron, and desulfurization by refining outside the furnace. Desulfurization by refining outside the furnace is main...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C1/02
CPCY02P10/20
Inventor 易操孟宪成李兴才王克玉俞飞侯娜娜
Owner 德龙钢铁有限公司
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