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A High Efficiency Stirring Desulfurization Method

A stirring desulfurization, high-efficiency technology, applied in the field of molten iron pretreatment, to achieve good application prospects, low cost, high efficiency

Active Publication Date: 2019-12-20
NINGBO IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a high-efficiency stirring desulfurization method, which solves the problem of how to achieve high-efficiency desulfurization under low-cost conditions, and the sulfur content of molten iron after stirring desulfurization treatment meets the production requirements of ultra-low sulfur steel technical problem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Take the molten iron from the torpedo tank to the iron ladle at the can dumping station, and hoist the iron ladle to the desulfurization treatment position by driving. Before the desulfurization treatment, take temperature measurement and sampling, and then carry out the front slag removal, the front slag removal requirements The exposed area of ​​molten iron is more than 75%;

[0023] (2) The temperature of the molten iron during desulfurization treatment is ≥1280°C; lower the stirring paddle to the bottom of the paddle to contact the molten iron liquid level, and record the descending height h; continue to lower the stirring paddle to the descending height H, start stirring the molten iron, and gradually increase the stirring speed Until the stirring current reaches A; keep the stirring current at A, add the desulfurizer step by step, and weigh the material in the silo during the feeding process (according to the total amount of 1 / 2 lime, all fluorite, and the tota...

Embodiment 2

[0028] (1) Take the molten iron from the torpedo tank to the iron ladle at the can dumping station, and hoist the iron ladle to the desulfurization treatment position by driving. Before the desulfurization treatment, take temperature measurement and sampling, and then carry out the front slag removal, the front slag removal requirements The exposed area of ​​molten iron is more than 75%;

[0029] (2) The temperature of the molten iron during desulfurization treatment is ≥1280°C; lower the stirring paddle to the bottom of the paddle to contact the molten iron liquid level, and record the descending height h; continue to lower the stirring paddle to the descending height H, start stirring the molten iron, and gradually increase the stirring speed Until the stirring current reaches A; keep the stirring current at A, add the desulfurizer step by step, and weigh the material in the silo during the feeding process (according to the total amount of 1 / 2 lime, all fluorite, and the tota...

Embodiment 3

[0034] (1) Take the molten iron from the torpedo tank to the iron ladle at the can dumping station, and hoist the iron ladle to the desulfurization treatment position by driving. Before the desulfurization treatment, take temperature measurement and sampling, and then carry out the front slag removal, the front slag removal requirements The exposed area of ​​molten iron is more than 75%;

[0035] (2) The temperature of the molten iron during desulfurization treatment is ≥1280°C; lower the stirring paddle until the bottom of the paddle touches the molten iron liquid level, and record the descending height h; continue to lower the stirring paddle to the descending height H, start stirring the molten iron, and gradually increase the stirring speed Until the stirring current reaches A; keep the stirring current at A, add the desulfurizer step by step, and weigh the material in the silo (according to the total amount of 1 / 2 lime, all fluorite, and the total amount of 1 / 2 lime) When...

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PUM

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Abstract

The invention relates to a high-efficiency stirring desulphurization method. The method comprises the following steps: (1) opening a foundry ladle to a slagging-off position for pre-slagging-off; (2)allowing a stirring paddle to descend until the bottom of the paddle contacts with the surface of molten iron, recording descending height h, allowing the stirring paddle to continue to descend to a descending height H, starting to stir the molten iron, gradually increasing the stirring speed until stirring current reaches an A interval, maintaining the stirring current in the A interval, adding adesulphurization agent step by step, continuing stirring until addition of all the desulphurization agent is completed, increasing the stirring speed until stirring current reaches a B interval, andcontinuing stirring; and (3) after completion of the mixing, carrying out slagging-off. According to the invention, out-of-station sulfur content can be stably controlled within 15 ppm under the condition that the unit consumption of lime is no more than 7 kg / t by improving the blanking mode of stirring desulfurization, adjusting the insertion depth of the stirring paddle, optimizing the rotatingspeed of the stirring paddle and the slagging-off mechanism, etc.; and the method has low cost, high efficiency and good application prospects.

Description

technical field [0001] The invention belongs to the field of molten iron pretreatment, in particular to a high-efficiency stirring desulfurization method. Background technique [0002] As the global steel market continues to slump, and major steel companies are in the background of small profits or losses, in order to maintain their strong competitiveness in the market, steel companies need to continue to seek new profit growth points. Carry out self-pressurization, tap the potential deeply, and ensure low-cost smelting. [0003] With the gradual increase of the production proportion of low-sulfur and ultra-low-sulfur steel, the sulfur content of molten iron entering the furnace is required to be lower and lower, which puts forward higher requirements for the desulfurization of molten iron pretreatment. [0004] Stirring desulfurization has been widely used in the production of ultra-low sulfur steel due to its good desulfurization kinetics conditions. The attention of the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/064
Inventor 葛允宗张本亮杜振杰王辉李洪鹏常海涛刘万善
Owner NINGBO IRON & STEEL