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Desulfurizing method for molten iron containing sulfur

A hot metal desulfurization and molten iron technology, applied in the field of steelmaking, can solve the problems of low utilization rate of desulfurization agent, large consumption of desulfurization agent, reduction of desulfurization cost, etc., to achieve optimal desulfurization kinetics, high utilization rate of desulfurization agent, and reduction of desulfurization cost effect

Active Publication Date: 2016-03-09
SHOUGANG CORPORATION +1
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  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0004] The desulfurization method of sulfur-containing molten iron provided by this application solves or partially solves the technical problems of low utilization rate of desulfurizer in the prior art, excessive consumption of desulfurizer, and relatively high desulfurization cost, and achieves the goal of ensuring desulfurization effect and Under the premise of the desulfurization cycle, it can reduce the consumption of desulfurization agent by 15-20%, and effectively reduce the technical effect of desulfurization cost

Method used

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  • Desulfurizing method for molten iron containing sulfur

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Effect test

Embodiment 1

[0047] Desulfurization is carried out by using a low-cost desulfurization method for medium-high sulfur molten iron. The composition of the molten iron before desulfurization is: by mass percentage, C: 4.33%, Si: 0.41%, Mn: 0.10%, P: 0.073%, S: 0.041, Ti: 0.07 , the temperature of molten iron is 1358°C, and the specific steps of the desulfurization method are:

[0048] S1: After the molten iron enters the desulfurization station, the slag removal operation is performed first, and the amount of slag removal is 50% of the total slag amount in the ladle in terms of mass percentage.

[0049] S2: After the slag removal, the injection is divided into three stages. In the first injection process, the injection volume of the powder is 1.0kg per ton of iron, and the powder injection rate is 720kg / h. The chemical composition of the powder 40% CaO, 30% CaC 2 , 30% Mg, nitrogen injection flow rate of 120Nm 3 / h, the injection pressure of the spray gun is 0.44MPa, the ratio of the powder...

Embodiment 2

[0055] Desulfurization is carried out by low-cost desulfurization method for medium and high-sulfur hot metal. The composition of hot metal before desulfurization is: by mass percentage, C: 4.23%, Si: 0.31%, Mn: 0.11%, P: 0.077%, S: 0.060, Ti: 0.05 , the temperature of molten iron is 1341°C, the specific steps of the desulfurization method are:

[0056] S1: After the molten iron enters the desulfurization station, the slag removal operation is performed first, and the amount of slag removal is 50% of the total slag amount in the ladle in terms of mass percentage.

[0057] S2: After the slag removal, the injection is divided into three stages. In the first injection treatment, the injection volume of the powder is 1.1kg per ton of iron, and the powder injection rate is 720kg / h. The chemical composition of the powder 40% CaO, 30% CaC 2 , 30% Mg, nitrogen injection flow rate is 110Nm 3 / h, the injection pressure of the spray gun is 0.43MPa, the ratio of the powder injection rat...

Embodiment 3

[0063] Desulfurization is carried out by using a low-cost desulfurization method for medium-high sulfur molten iron. The composition of the molten iron before desulfurization is: by mass percentage, C: 4.41%, Si: 0.33%, Mn: 0.12%, P: 0.084%, S: 0.052, Ti: 0.09 , the temperature of molten iron is 1359°C, and the specific steps of the desulfurization method are:

[0064] S1: After the molten iron enters the desulfurization station, the slag removal operation is performed first, and the amount of slag removal is 50% of the total slag amount in the ladle in terms of mass percentage.

[0065] S2: After the slag removal, the injection is divided into three stages. In the first injection process, the injection volume of the powder is 1.0kg per ton of iron, and the powder injection rate is 720kg / h. The chemical composition of the powder 40% CaO, 30% CaC 2 , 30% Mg, nitrogen injection flow rate of 120Nm 3 / h, the injection pressure of the spray gun is 0.45MPa, the ratio of the powder...

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Abstract

The invention relates to a desulfurizing method for molten iron containing sulfur. The desulfurizing method includes the steps that a ladle is sent to a desulfurizing station, and a first time of slagging-off treatment is conducted; a first time of injection treatment is conducted on the ladle; a second time of injection treatment is conducted on the ladle; a third time of injection treatment is conducted on the ladle; and a second time of slagging-off treatment is conducted on the ladle. According to the desulfurizing method, on the premise that the desulfurizing effect and the desulfurizing period are ensured, the consumption of a desulfurizing agent can be reduced by 15-20%, and the desulfurizing cost is effectively reduced.

Description

technical field [0001] The invention relates to the technical field of steelmaking, in particular to a method for desulfurizing molten iron containing sulfur. Background technique [0002] Sulfur is a common element in steel. Except for sulfur-containing free-cutting steel, sulfur exists as a harmful element in most steels. have serious repercussions. In recent years, with the development of material science and technology, there have been higher and higher requirements for the control of harmful elements in steel, and the market demand for low-sulfur steel and even ultra-low-sulfur steel has become more and more extensive. Under this background, molten iron spraying Powder pre-desulfurization is widely used as an effective desulfurization method. However, with the continuous decline of steel prices, cost control has become a key point for the survival of enterprises. How to achieve low-cost desulfurization based on existing equipment has become the focus of research by va...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/064C21C1/02
CPCC21C1/02C21C7/064
Inventor 马文俊李海波陈斌包春林崔阳冀建立刘国梁赵东伟尹娜高攀罗衍昭庞在刚王东
Owner SHOUGANG CORPORATION
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