Slag splashing method for converter high-oxidisability furnace residue

A slag splash protection furnace and high oxidation technology, applied in the field of metallurgy, can solve problems such as unfavorable protection of converter lining, life of difficult converter lining, and difficult bonding of slag, so as to improve the effect of slag splash protection furnace, process optimization, slag splash The effect of increasing time

Inactive Publication Date: 2008-05-14
NANJING IRON & STEEL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, due to the low viscosity of highly oxidizing slag, the splashed slag is not easy to bond with the converter wall, and the formed slag splash layer is thin, which is not conducive to protecting the converter lining
Therefore, when the converter smelts various steels and high value-added steels, the highly oxidizing slag produced is not conducive to slag splashing to protect the furnace, and it is difficult to improve the life of the converter lining.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The method for protecting the furnace by slag splashing of the present invention is to leave a suitable amount of slag in the furnace after the steel is tapped from the converter for highly oxidizing slag, and blow nitrogen with a certain pressure and flow rate into the furnace top oxygen lance. The system adds a slagging agent containing a highly reactive reducing agent and magnesium oxide to the furnace, and uses the efficient reducing agent in the slag adjusting agent to reduce the iron oxide in the highly oxidizing slag, and at the same time increase the content of magnesium oxide and magnesium oxide in the slag. Solid phase particles, increase the melting temperature of highly oxidizing slag, and adjust the viscosity of slag at the same time, so that the physical properties of slag are suitable for the process requirements of slag splashing furnace protection. During the incubation period, the effective slag splashing time is increased. When slag adjusting agent is...

Embodiment 2

[0027] The method for protecting the furnace by slag splashing of the present invention is to leave a suitable amount of slag in the furnace after the steel is tapped from the converter for highly oxidizing slag, and blow nitrogen with a certain pressure and flow rate into the furnace top oxygen lance. The system adds a slagging agent containing a highly reactive reducing agent and magnesium oxide to the furnace, and uses the efficient reducing agent in the slag adjusting agent to reduce the iron oxide in the highly oxidizing slag, and at the same time increase the content of magnesium oxide and magnesium oxide in the slag. Solid phase particles, increase the melting temperature of highly oxidizing slag, and adjust the viscosity of slag at the same time, so that the physical properties of slag are suitable for the process requirements of slag splashing furnace protection. During the incubation period, the effective slag splashing time is increased. When slag adjusting agent is...

Embodiment 3

[0030]The method for protecting the furnace by slag splashing of the present invention is to leave a suitable amount of slag in the furnace after the steel is tapped from the converter for highly oxidizing slag, and blow nitrogen with a certain pressure and flow rate into the furnace top oxygen lance. The system adds a slagging agent containing a highly reactive reducing agent and magnesium oxide to the furnace, and uses the efficient reducing agent in the slag adjusting agent to reduce the iron oxide in the highly oxidizing slag, and at the same time increase the content of magnesium oxide and magnesium oxide in the slag. Solid phase particles, increase the melting temperature of highly oxidizing slag, and adjust the viscosity of slag at the same time, so that the physical properties of slag are suitable for the process requirements of slag splashing furnace protection. During the incubation period, the effective slag splashing time is increased. When slag adjusting agent is ...

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PUM

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Abstract

The invention pertains to the metallurgy field and relates to a method of slag splashing for converter maintenance, in particular to a method of the slag splashing for the converter maintenance of converter high oxide slag. After steel come out from a converter, the slag is left inside the converter, a converter top oxygen lance is used for insufflating nitrogen; after the nitrogen is insufflated into the converter through the converter top oxygen lance, a slag modifier compounded by anthracite and magnesia is added into the converter, and the addition quantity of the slag modifier is: 30-100 kilograms slag modifier is added to every ton of the slag. Terminal slag of the converter ironmaking is splashed and bonded on the converter wall to form slag splashing layers. By actualizing the slag splashing for the converter maintenance of the invention, the effect of the slag splashing for the converter maintenance of the converter with high oxidation slag production when smelting the high additional value steel can be obviously improved, and the service life of a converter liner of the converter can be greatly prolonged.

Description

technical field [0001] The invention belongs to the field of metallurgy, and relates to a method for protecting a furnace by slag splashing, in particular to a method for protecting a furnace by splashing slag with highly oxidative slag in a converter. Background technique [0002] Converter steelmaking uses slag splashing to protect the furnace, which can greatly increase the life of the converter lining and reduce the cost of steelmaking. The slag splash protection method of converter slag is to leave a suitable amount of slag in the converter after the steel is tapped, and blow nitrogen with a certain pressure and flow rate into the furnace top oxygen lance to splash and stick the slag at the end of converter steelmaking. It is bound on the furnace wall to form a slag splash layer, which protects the furnace lining during the steelmaking process and prolongs the life of the furnace lining. [0003] When the converter smelts low-carbon and ultra-low-carbon steel, it is ne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/44C21C5/36
Inventor 姚永宽钟良才耿建林朱英雄蔡可森周贺贺刘德祥
Owner NANJING IRON & STEEL CO LTD
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