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Molten iron desulfurization method and desulfurization apparatus

A desulfurization device and molten iron technology, applied in the direction of manufacturing converters, etc., can solve the problem of low desulfurization rate, and achieve the effect of improving desulfurization rate and preventing the increase of equipment cost.

Active Publication Date: 2018-12-21
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is difficult for the desulfurizer to get involved in the molten steel, so the desulfurization rate is low

Method used

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  • Molten iron desulfurization method and desulfurization apparatus
  • Molten iron desulfurization method and desulfurization apparatus
  • Molten iron desulfurization method and desulfurization apparatus

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Effect test

Embodiment

[0054] use figure 1 The shown desulfurization device 0 of the present invention and the desulfurization device of the conventional example in which the blowing device 6 is removed from the desulfurization device 0 were obtained, and the desulfurization rate was obtained. That is, when tapping the molten steel 7 that has been blown by the converter 1 (primary refining) by conventional means, a desulfurizer is added, and the desulfurization rate is obtained from [S] before and after tapping.

[0055] The size of the tapping hole 13 of the converter 1 is 250 mm. The desulfurizing agent 7 was added by blowing the desulfurizing agent 7 toward the tapping stream 11 using the blowing device 0 . The nozzle diameter of the blowing nozzle 3 was 200 mm. Ar gas was used as the carrier gas of the desulfurizing agent 7 .

[0056] In the desulfurization device 0, the blowing nozzle 3 of the desulfurizing agent 7 is fixed and fixed by appropriate means such as welding and fastening in suc...

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Abstract

The present invention provides a technique for carrying out desulfurization at a high desulfurization ratio when tapping molten steel from a converter. Using spray equipment 6 comprising a spray nozzle 3 provided on a charging chute 8, a vessel (hopper) 4 for storing a desulfurization agent, and piping 5 connecting the spray nozzle and the vessel, the desulfurization agent 7 is sprayed from the spray nozzle 3 onto a tapped molten steel flow 11 when tapping molten steel from a refining vessel 1 to a ladle 2.

Description

technical field [0001] The invention relates to a desulfurization method and a desulfurization device for molten iron. Background technique [0002] In the past, when smelting low-sulfur steel such as [S]≤24ppm, in order to reduce the desulfurization load in the secondary refining, when the steel is tapped from the converter to the ladle, the desulfurizer and the deoxidizer are simultaneously injected from the slip The tank is poured into the ladle for desulfurization. However, it is difficult for the desulfurizer to get involved in the molten steel, so the desulfurization rate is low. [0003] Patent Document 1 discloses a method of desulfurizing by adding a deoxidizing agent, a desulfurizing agent, and a slag modifier to molten steel during tapping. In this method, the desulfurizing agent and the molten steel are stirred by using the stirring energy of the tapping flow during the tapping of the converter to make the desulfurizing agent and the molten steel react. [000...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/04C21C5/46C21C7/064
CPCC21C5/46C21C7/04C21C7/064
Inventor 井蓋俊夫
Owner NIPPON STEEL CORP