Molten iron desulphurization device and method

Abstract

The invention provides a molten iron desulphurization device which comprises a blowing tank (1), a stirring unit (2), a lifting unit (3) and a molten iron tank (4). A discharge outlet in the bottom of the blowing tank (1) is connected with the stirring unit (2) through a conveying pipe (5). The molten iron tank (4) is arranged under the stirring unit (2). The lifting unit (3) is connected with the stirring unit (2) to control the stirring unit (2) to go up and down. Furthermore, the invention provides a molten iron desulphurization method adopting the molten iron desulphurization device. By means of the molten iron desulphurization device and method, good dynamic conditions and stable and efficient desulfurization capacity are achieved, and the purpose of efficient desulfurization with low consumption can be achieved.

Description

technical field

[0001] The invention relates to the technical field of converter steelmaking, in particular to a molten iron desulfurization device and method. Background technique

[0002] In the converter steelmaking process, the desulfurization pretreatment of the molten iron in the molten iron tank is an important link to realize the modern production process of the steelmaking plant. Especially in the situation of increasingly fierce competition in the steel market, users have continuously improved the quality requirements of steel products. As a harmful element in molten iron, sulfur must be controlled in steel products.

[0003] Among the existing hot metal desulfurization pretreatment methods in hot metal tanks, the most widely used and most representative methods are mainly the injection method and the mechanical stirring method.

[0004] The injection method is to use high-pressure gas as a carrier to spray desulfurization powder from a spray gun into molten iron....

Examples

Embodiment 1

[0044] This embodiment provides a molten iron desulfurization device, including a blowing tank 1 , a stirring device 2 , a lifting device 3 , and a molten iron tank 4 . The top of the blowing tank 1 is provided with a main air pipe 6 , and the outlet of the bottom of the spray tank 1 is provided with an auxiliary blowing air pipe 7 , and the auxiliary blowing air pipe 7 is connected to the conveying pipe 5 . Nitrogen gas is passed through the main air pipe 6 and the auxiliary blow air pipe 7, and a desulfurizing agent is stored in the blowing tank 1, and the desulfurizing agent is CaO, CaF 2 The mixture, the mass percentage of CaO is 90%, CaF 2 The mass percentage is 10%. The main air pipe 6 can be set above the desulfurizing agent in the blowing tank 1, and the main air pipe 6 inflates and pressurizes the blowing tank 1 so that the desulfurizing agent flows out from the discharge port at the bottom of the blowing tank 1, assisting the blowing of the air pipe 7 Just set it u...

Embodiment 2

[0062] This embodiment provides a molten iron desulfurization device and method. The molten iron desulfurization device is basically the same as in Embodiment 1. The method for using the above device to desulfurize molten iron includes the following steps:

[0063] 1) Transport the molten iron tank 4 to the desulfurization station for temperature measurement and sampling.

[0064] 2) The lifting drive mechanism 31 is started, the traction agitator 23 is lowered, and after reaching 250mm above the liquid level of the molten iron, the auxiliary blowing vent pipe 7 is opened to blow nitrogen, and the nitrogen is ejected from the bottom of the agitator 23. At this time, the working pressure of nitrogen is 0.4MPa, Injection volume is 20Nm 3 / h.

[0065] 3) The agitator 23 continues to descend, and when it reaches the set height (the center of the agitator blade coincides with the center of the molten iron), the main ventilation pipe 6 and the discharge port of the injection tank 1...

Embodiment 3

[0072] This embodiment provides a molten iron desulfurization device and method. The molten iron desulfurization device is basically the same as in Embodiment 1. The method for using the above device to desulfurize molten iron includes the following steps:

[0073] 1) Transport the molten iron tank 4 to the desulfurization station for temperature measurement and sampling.

[0074] 2) The lifting drive mechanism 31 is started, the traction agitator 23 is lowered, and after reaching 150 mm above the liquid level of the molten iron, the auxiliary blowing vent pipe 7 is opened to blow nitrogen, and the nitrogen is ejected from the bottom of the agitator 23. At this time, the working pressure of nitrogen is 0.5 MPa, Injection volume is 25Nm 3 / h.

[0075] 3) The agitator 23 continues to descend, and when it reaches the set height (the center of the agitator blade coincides with the center of the molten iron), the main ventilation pipe 6 and the discharge port of the injection tank...

technical field

[0001] The invention relates to the technical field of converter steelmaking, in particular to a molten iron desulfurization device and method. Background technique

[0002] In the converter steelmaking process, the desulfurization pretreatment of the molten iron in the molten iron tank is an important link to realize the modern production process of the steelmaking plant. Especially in the situation of increasingly fierce competition in the steel market, users have continuously improved the quality requirements of steel products. As a harmful element in molten iron, sulfur must be controlled in steel products.

[0003] Among the existing hot metal desulfurization pretreatment methods in hot metal tanks, the most widely used and most representative methods are mainly the injection method and the mechanical stirring method.

[0004] The injection method is to use high-pressure gas as a carrier to spray desulfurization powder from a spray gun into molten iron....

Examples

Embodiment 1

[0044] This embodiment provides a molten iron desulfurization device, including a blowing tank 1 , a stirring device 2 , a lifting device 3 , and a molten iron tank 4 . The top of the blowing tank 1 is provided with a main air pipe 6 , and the outlet of the bottom of the spray tank 1 is provided with an auxiliary blowing air pipe 7 , and the auxiliary blowing air pipe 7 is connected to the conveying pipe 5 . Nitrogen gas is passed through the main air pipe 6 and the auxiliary blow air pipe 7, and a desulfurizing agent is stored in the blowing tank 1, and the desulfurizing agent is CaO, CaF 2 The mixture, the mass percentage of CaO is 90%, CaF 2 The mass percentage is 10%. The main air pipe 6 can be set above the desulfurizing agent in the blowing tank 1, and the main air pipe 6 inflates and pressurizes the blowing tank 1 so that the desulfurizing agent flows out from the discharge port at the bottom of the blowing tank 1, assisting the blowing of the air pipe 7 Just set it u...

Embodiment 2

[0062] This embodiment provides a molten iron desulfurization device and method. The molten iron desulfurization device is basically the same as in Embodiment 1. The method for using the above device to desulfurize molten iron includes the following steps:

[0063] 1) Transport the molten iron tank 4 to the desulfurization station for temperature measurement and sampling.

[0064] 2) The lifting drive mechanism 31 is started, the traction agitator 23 is lowered, and after reaching 250mm above the liquid level of the molten iron, the auxiliary blowing vent pipe 7 is opened to blow nitrogen, and the nitrogen is ejected from the bottom of the agitator 23. At this time, the working pressure of nitrogen is 0.4MPa, Injection volume is 20Nm 3 / h.

[0065] 3) The agitator 23 continues to descend, and when it reaches the set height (the center of the agitator blade coincides with the center of the molten iron), the main ventilation pipe 6 and the discharge port of the injection tank 1...

Embodiment 3

[0072] This embodiment provides a molten iron desulfurization device and method. The molten iron desulfurization device is basically the same as in Embodiment 1. The method for using the above device to desulfurize molten iron includes the following steps:

[0073] 1) Transport the molten iron tank 4 to the desulfurization station for temperature measurement and sampling.

[0074] 2) The lifting drive mechanism 31 is started, the traction agitator 23 is lowered, and after reaching 150 mm above the liquid level of the molten iron, the auxiliary blowing vent pipe 7 is opened to blow nitrogen, and the nitrogen is ejected from the bottom of the agitator 23. At this time, the working pressure of nitrogen is 0.5 MPa, Injection volume is 25Nm 3 / h.

[0075] 3) The agitator 23 continues to descend, and when it reaches the set height (the center of the agitator blade coincides with the center of the molten iron), the main ventilation pipe 6 and the discharge port of the injection tank...

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