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Furnace protection process combining high flow bottom blowing slag splashing with top blowing slag splashing

A large flow, slag phase technology, applied in the field of metallurgy, can solve problems such as poor furnace maintenance effect, achieve the effect of shortening the time of slag splashing and furnace protection, shortening the time of furnace protection, and reducing the frequency of static maintenance

Inactive Publication Date: 2019-01-25
GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a furnace protection process combining large-flow bottom blowing slag splashing and top blowing slag splashing to solve the problem of poor furnace type maintenance effect under the condition of bottom blowing powder spraying in converter in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Add lime, limestone, light-burned dolomite, raw dolomite, and magnesite during the smelting process of the converter to obtain the final slag of the converter. After tapping, adjust the nitrogen flow rate of the carrier gas of the bottom blowing lance to 2000Nm 3 / h, annular seam gas nitrogen flow rate to 100Nm 3 / h, blow nitrogen into the furnace, shake the furnace back and forth to splash slag for 1.5min, then lower the top gun to splash slag, adjust the top gun to 200mm above the reference gun position and blow nitrogen into the furnace, the nitrogen flow rate is 28500Nm 3 / h, at the same time, adjust the nitrogen flow rate of the carrier gas of the bottom blowing powder spray gun to 500Nm 3 / h, annular seam gas nitrogen flow rate to 50Nm 3 / h; After this method is used to protect the furnace by slag splashing, the slag hangs evenly in the furnace, and there is no uneven slag hanging in the position of the furnace.

Embodiment 2

[0040] Add lime, limestone, light-burned dolomite, raw dolomite, and magnesite during the smelting process of the converter to obtain the final slag of the converter. After tapping, adjust the nitrogen flow rate of the carrier gas of the bottom blowing lance to 2400Nm 3 / h, annular seam gas nitrogen flow rate to 200Nm 3 / h, blow nitrogen into the furnace, shake the furnace back and forth for 2.5 minutes to splash slag, then lower the top gun to splash slag, adjust the top gun to 600mm above the reference gun position and blow nitrogen into the furnace, the nitrogen flow rate is 31500Nm 3 / h, at the same time, adjust the nitrogen flow rate of the carrier gas of the bottom blowing powder gun to 1000Nm 3 / h, annular seam gas nitrogen flow rate to 100Nm 3 / h; After this method is used to protect the furnace by slag splashing, the slag hangs evenly in the furnace, and there is no uneven slag hanging in the position of the furnace.

Embodiment 3

[0042] Add lime, limestone, light-burned dolomite, raw dolomite, and magnesite during the smelting process of the converter to obtain the final slag of the converter. After tapping, adjust the nitrogen flow rate of the carrier gas of the bottom blowing lance to 2200Nm 3 / h, the annular seam gas nitrogen flow rate to 150Nm 3 / h, blow nitrogen into the furnace, shake the furnace back and forth to splash slag for 2 minutes, then lower the top gun to splash slag, adjust the top gun to 400mm above the reference gun position and blow nitrogen into the furnace, the nitrogen flow rate is 30500Nm 3 / h, at the same time, adjust the nitrogen flow rate of the carrier gas of the bottom blowing powder spray gun to 800Nm 3 / h, annular seam gas nitrogen flow rate to 80Nm 3 / h; After this method is used to protect the furnace by slag splashing, the slag hangs evenly in the furnace, and there is no uneven slag hanging in the position of the furnace.

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Abstract

The invention discloses a furnace protection process combining high flow bottom blowing slag splashing with top blowing slag splashing, and belongs to the technical field of metallurgy. The process includes a converter cap and a trunnion for slagging operation and bottom blowing slag splashing maintenance and a converter bottom and a batch for top gun slag splashing as the main maintenance. On onehand, the high flow bottom blowing slag splashing process is adopted to make up for the blank of the current high flow bottom blowing slag splashing process; on the other hand, the high flow bottom blowing slag splashing is combined with the top blowing slag splashing process. The high flow bottom blowing slag splashing solves the problem of difficult maintenance of the converter cap portion of the top gun slag splashing furnace protection process by compensation, and the top gun slag splashing process solves the problem of difficult maintenance of the bottom of the high flow bottom blowing slag splashing furnace protection process, the two processes are complementary, the furnace protection quality is improved, and conditions are created for achieving long furnace life of a converter. The process improves the slag splashing furnace protection effect of the converter, reduces the static maintenance frequency of the converter cap portion, shortens the slag splashing furnace protectiontime, improves the converter operation rate, achieves the long furnace life of the converter, prevents the converter bottom from rising, and prevents a bottom blowing spray gun from being blocked.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a furnace protection process combining large-flow bottom-blowing slag splashing and top-blowing slag splashing. Background technique [0002] The slag splashing furnace protection technology is to use the steelmaking end slag whose MgO content reaches saturation or supersaturation, through high-pressure N 2 Sputtering, cooling, and solidification form a layer of high-melting slag layer on the surface of the furnace lining, which is well bonded to the furnace lining. The slag-splash layer formed by slag-splashing has good corrosion resistance, and at the same time, it can inhibit the oxidation and decarburization of the surface of the lining brick, and can reduce the erosion and erosion of the lining brick by high-temperature slag, thereby protecting the lining brick, reducing the loss rate of refractory materials, and reducing gunning Reduce material consumption, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/36C21C5/35
CPCC21C5/35C21C5/36
Inventor 朱青德胡邵岩魏国立朱荣阮强茹作栋王德勇张英嘉
Owner GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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