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Method of slag splashing for protection of converter

A technology for protecting furnaces and converters by slag splashing, which is applied in the manufacture of converters, etc., which can solve the problems of poor furnace protection by slag splashing and failure to protect furnaces by slag splashing, and achieve the effects of prolonging service life and reducing costs

Active Publication Date: 2020-06-19
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem that in the existing converter slag splashing protection method, the slag splashing furnace protection effect is poor due to the strong oxidation of the converter slag end point, and the requirements of the slag splashing furnace protection cannot be met. The present invention provides a converter slag splashing method. The method of protecting the furnace

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A method for protecting the converter by slag splashing, wherein the oxygen content of molten steel at the end point of the converter is 572ppm, after the converter is tapped, 1 / 2 of the slag in the converter is poured out, and the thickness of the furnace shaft is measured by a thickness gauge at this time to be 1084mm, and the The magnesia-carbon bricks dismantled during the use of the ladle are broken into 10-15mm particles, which are transported to the top silo of the converter through a belt. After the converter is restored to the blowing position, magnesia-carbon bricks are added to the converter. The amount of magnesia-carbon bricks added is 1.2kg / ton of tapping molten steel, magnesia-carbon bricks contain 70% MgO, 14% C and the rest of impurities in the mass content, add magnesia-carbon bricks into the converter and let it stand for 45s, then add lightly burned dolomite, lightly The addition of burnt dolomite is 2.5kg / ton of tapping molten steel, and the describe...

Embodiment 2

[0028] A method for protecting the converter by slag splashing, wherein the oxygen content of the molten steel at the end of the converter is 647ppm, after the converter is tapped, 2 / 3 of the slag in the converter is poured out, and the thickness of the furnace shaft is measured by a thickness gauge at this time to be 1079mm, and the The magnesia-carbon bricks dismantled during the use of the ladle are broken into 10-15mm particles, which are transported to the top silo of the converter through a belt. After the converter is restored to the blowing position, magnesia-carbon bricks are added to the converter. The amount of magnesia-carbon bricks added is 1.5kg / ton of tapping molten steel, magnesia-carbon bricks contain 72% MgO, 15% C and the rest of the impurities, add magnesia-carbon bricks into the converter and let it stand for 50s, then add lightly burned dolomite, light The addition of burnt dolomite is 3kg / ton of tapping molten steel, and the described dolomite contains Ca...

Embodiment 3

[0032] A method for protecting the converter by slag splashing, wherein the oxygen content of the molten steel at the end of the converter is 672ppm, after the converter is tapped, 2 / 3 of the slag in the converter is poured out, and the thickness of the furnace shaft is measured to be 1077mm by a thickness gauge at this time. The magnesia-carbon bricks dismantled during the use of the ladle are broken into 10-15mm particles, which are transported to the top silo of the converter through a belt. After the converter is restored to the blowing position, magnesia-carbon bricks are added to the converter. The amount of magnesia-carbon bricks added is 2kg / ton of molten steel, the magnesia-carbon brick contains 74% MgO, 16% C and the rest of impurities. Add magnesia-carbon bricks to the converter and let it stand for 60s, then add lightly burned dolomite, lightly burnt The addition of dolomite is 4kg / ton of tapping molten steel, and described dolomite comprises the CaO that mass cont...

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PUM

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Abstract

The invention relates to the technical field of converter smelting, in particular to a method of slag splashing for protection of a converter. The method of slag splashing for protection of the converter comprises the steps that after tapping of the converter is finished, 1 / 2-2 / 3 slag in the converter is poured out, magnesia carbon bricks and light-burned magnesian limestone are sequentially arranged into the converter, gun-descending nitrogen flushing is carried out for 180-240 s, and slag splashing for protection of the converter is finished. The method of slag splashing for protection of the converter overcomes the defect of poor slag splashing converter protection effect caused by high converter slag end-point oxidability, and is easy to operate, low in cost and capable of achieving the ideal slag splashing converter protection effect.

Description

technical field [0001] The invention relates to the technical field of converter smelting, in particular to a method for protecting a converter by splashing slag. Background technique [0002] Slag splashing protects the furnace during the steelmaking process of the converter. After the molten steel is discharged, light-burned dolomite, magnesium balls and other substances are added to the converter to make the MgO content in the slag reach a saturated or supersaturated state. Finally, it is sprayed by high-pressure nitrogen gas. , A layer of high melting point slag splash layer is formed on the surface of the furnace lining, and it is well sintered and adhered to the furnace lining to reduce the erosion of the furnace lining during the molten steel blowing process. [0003] In the steelmaking process using the molten iron dual process, that is, the molten iron first extracts vanadium in the steelmaking process, because the carbon content of the semi-steel decreases after th...

Claims

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Application Information

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IPC IPC(8): C21C5/44
CPCC21C5/443
Inventor 李亚厚靳刚强康毅胡心光连庆康爱元徐焕钦
Owner HEBEI IRON AND STEEL