Splashed slag furnace protection method for vanadium extraction converter

A technology for protecting furnaces and converters by splashing slag, applied in the field of iron and steel metallurgy, can solve the problems of low end temperature and short time of vanadium extraction process, and achieve the effect of simple operation and good furnace protection effect

Active Publication Date: 2014-12-17
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are obvious differences between the vanadium extraction converter and the steelmaking converter: firstly, the vanadium extraction process takes a short time, and the end point temperature of the vanadium extraction process control is low, about 1340-1450°C. Therefore, the viscosity of the vanadium slag after slag adjustment needs Properly adjusted so that it can splash and adhere to the furnace lining

Method used

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  • Splashed slag furnace protection method for vanadium extraction converter

Examples

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Effect test

example 1

[0029] Mix vanadium-containing molten iron into a 30t converter for vanadium blowing. When the vanadium blowing end point is reached, the semi-steel temperature is 1400°C, and the vanadium-extracted semi-steel is poured out. Then shake the converter to the "zero" position (that is, the converter is not tilted and is in a vertical state), add metallurgical magnesia and carbon powder with a total amount of 2kg / t steel as slag adjustment agent, and blow oxygen slag for 1min to blow the oxidized slag to The slag is uniformly melted to obtain thick vanadium slag, wherein the particle size of the regulator used is below 3.0 mm. After the oxidized slag blowing is completed, switch between oxygen and nitrogen for nitrogen blowing and slag splashing. The working pressure of nitrogen gas for slag splashing is adjusted to 0.8MPa, the distance between the slag splash gun and the furnace bottom is 1000mm, and the slag splashing time is 3.5min. After the thick vanadium slag adheres evenly o...

example 2

[0031] Mix vanadium-containing molten iron into a 120t converter for vanadium blowing. When the vanadium blowing end point is reached, the semi-steel temperature is 1430°C, and the vanadium-extracted semi-steel is poured out. Then shake the converter to the "zero" position, add metallurgical magnesia and carbon powder with a total amount of 3.8kg / t steel as a slag adjustment agent, and pass in oxygen for 2 minutes to blow the oxidized slag until the slag is uniform, and obtain a thick vanadium slag , wherein the particle size of the regulator used is below 3.0mm. After the oxidized slag blowing is completed, switch between oxygen and nitrogen for nitrogen blowing and slag splashing. The working pressure of nitrogen gas for slag splashing is adjusted to 0.9MPa, the distance between the slag splashing gun and the furnace bottom is 1250mm, and the slag splashing time is 3min. After the thick vanadium slag adheres evenly on the furnace lining of the converter, lift the gun and sha...

example 3

[0033]Mix vanadium-containing molten iron into a 200t converter for vanadium blowing. When the vanadium blowing end point is reached, the semi-steel temperature is 1450°C, and the vanadium-extracted semi-steel is poured out. Then shake the converter to the "zero" position, add metallurgical magnesia and carbon powder with a total amount of 5g / t steel as a slag adjustment agent, and pass in oxygen for 3 minutes to blow the oxidized slag until the slag is evenly dissolved, and a thick vanadium slag is obtained. Wherein, the particle size of the regulator used is below 3.0 mm. After the oxidized slag blowing is completed, switch between oxygen and nitrogen for nitrogen blowing and slag splashing. The working pressure of nitrogen gas for slag splashing is adjusted to 1.0MPa, the distance between the slag splash gun and the furnace bottom is 1500mm, and the slag splashing time is 4min. After the thick vanadium slag adheres evenly on the furnace lining of the converter, lift the gun...

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Abstract

The invention discloses a splashed slag furnace protection method for a vanadium extraction converter. The method comprises the following steps: after completing converter tapping and before performing splashed slag furnace protection, adding the magnesian slag modifier with the particle size under 3.0 mm into the converter and performing oxidizing slag blowing to obtain the condensed vanadium slag which can be adhered to a converter lining, wherein the magnesian slag modifier is composed of fettling magnesite grain and carbon powder. According to the invention, with the adoption of the method, the furnace life of the vanadium extraction converter can be prolonged remarkably with the range of more than 1000 furnace, and the method has the advantages of simplicity in operation, good furnace protection effect, and capabilities of remarkably prolonging the furnace life of the vanadium extraction converter and reducing the vanadium extraction cost.

Description

technical field [0001] The patent of the invention belongs to the field of iron and steel metallurgy, and in particular relates to the process of protecting the converter by splashing slag for vanadium-containing molten iron smelting. Background technique [0002] Converter slag splashing furnace protection technology and combined blowing steelmaking technology are listed as two major new technologies in converter steelmaking. Among them, converter slag splashing protection is an effective technical measure to increase the service life of the converter. The basic principle is to add a slag adjusting agent to the converter after the converter is tapped to make the MgO in it chemically react with the slag to form a series of high melting points. Substances (such as magnesia-iron spinel) are sprayed to most or designated areas of the furnace lining by the high-pressure nitrogen gas sprayed through the oxygen lance system, and adhere to the inner wall of the furnace lining to fo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/36
Inventor 戈文荪龚洪君熊开伟陈炼王二军黄正华卓钧周海龙张龙超朱鹏张家利黄东平董克平蒋龙奎王建李龙
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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