A method for maintaining the bottom of a dephosphorization converter

A dephosphorization converter and furnace bottom technology, applied in the manufacture of converters, etc., can solve the problems of poor adhesion of dephosphorization furnace slag, inability to adhere to the furnace wall, and failure to protect the furnace lining, so as to ensure the effect of bottom blowing and protect Furnace lining and furnace bottom, the effect of reducing lime consumption

Active Publication Date: 2019-11-19
SHOUGANG JINGTANG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The blowing end temperature of the dephosphorization converter is low, and the temperature in the furnace is about 1350°C. At present, the furnace lining is mainly protected by splashing slag and adding dolomite, but the slag of the dephosphorization furnace has poor adhesion and cannot adhere to the furnace wall, and most of the slag accumulates At the bottom of the furnace, it cannot protect the furnace lining, but instead causes the bottom of the furnace to rise, affecting the effect of bottom blowing

Method used

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  • A method for maintaining the bottom of a dephosphorization converter
  • A method for maintaining the bottom of a dephosphorization converter

Examples

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Embodiment 1

[0028] The method for maintaining the bottom of the dephosphorization converter according to the embodiment of the present invention, the method includes:

[0029] S101: Pour the liquid decarburized slag after smelting semi-steel in the decarburization furnace into the feeding device; the decarburized slag is decarburized semi-steel slag with a melting point of 1450°C; the composition of the decarburized slag is shown in Table 1 ; The basicity R of the decarburized slag is 3.7;

[0030] Pour the decarburized slag into the dephosphorized converter after tapping through a feeding device; the feeding device is a slag tank; the capacity of the dephosphorized converter is 300t, and the amount of added decarburized slag is 10t;

[0031] S102: Add cold solidified pellets to the dephosphorization converter, so that the hot decarburization slag in the dephosphorization converter is cooled and thickened; the amount of cold solidified pellets is based on the next batch of molten iron ent...

Embodiment 2

[0035] The method for maintaining the bottom of the dephosphorization converter according to the embodiment of the present invention, the method includes:

[0036] S201: Pour the liquid decarburized slag after smelting semi-steel in the decarburization furnace into the feeding device; the decarburized slag is decarburized semi-steel slag with a melting point of 1465°C; the composition of the decarburized slag is shown in Table 1 ; The basicity R of the decarburized slag is 3.03;

[0037] The decarburization slag is poured into the dephosphorization converter after tapping through the feeding device; the feeding device is a slag tank, and the slag irrigation is provided with a diversion nozzle to prevent the process of mixing slag from spreading; the capacity of the dephosphorization converter is 300t, the addition of described decarburization slag is 10t;

[0038] S202: Add cold-fixed pellets to the dephosphorization converter, so that the hot decarburization slag in the deph...

Embodiment 3

[0042] The method for maintaining the bottom of the dephosphorization converter according to the embodiment of the present invention, the method includes:

[0043] S301: Pour the liquid decarburized slag after smelting semi-steel in the decarburization furnace into the feeding device; the decarburized slag is decarburized semi-steel slag with a melting point of 1476°C; the composition of the decarburized slag is shown in Table 1 ; The basicity R of the decarburized slag is 3.43;

[0044] Pour the decarburized slag into the dephosphorized converter after tapping through a feeding device; the feeding device is a slag tank; the capacity of the dephosphorized converter is 300t, and the amount of added decarburized slag is 20t;

[0045]S302: Add cold-fixed pellets to the dephosphorization converter, so that the hot decarburization slag in the dephosphorization converter is cooled and thickened; the amount of cold-fixed pellets is based on the temperature of molten iron, the amount ...

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Abstract

The invention discloses a dephosphorization converter bottom maintaining method. The dephosphorization converter bottom maintaining method comprises the steps that liquid decarbonized slag is added into a dephosphorization converter subjected to steel tapping, wherein the decarbonized slag is decarbonized semisteel slag obtained after semisteel is smelted in a decarbonization furnace, and the melting point of the decarbonized slag is 1450-1500 DEG C; cooled agglomerated pellets are added into the dephosphorization converter, so that the liquid decarbonized slag in the dephosphorization converter is cooled and densified; and the dephosphorization converter is subjected to slag splashing operation, and after the decarbonized slag is completely solidified, converter bottom maintaining is finished. The decarbonized slag is high in melting point, can be quickly solidified after slag splashing and achieves an effect of protecting a lining and the bottom of the converter; meanwhile, the decarbonized slag has the characteristics of being high in alkalinity and ferric oxide content and capable of reducing the consumption amount of lime of the dephosphorization converter and providing the initial high-ferric-oxide condition for the dephosphorization converter, so that the slagging speed in the initial stage of smelting is increased, and the purpose of smelting ultralow-phosphorus steel with the low cost is achieved.

Description

technical field [0001] The invention relates to the technical field of steelmaking, in particular to a method for maintaining the bottom of a dephosphorization converter. Background technique [0002] With the development of modern industry and the advancement of science and technology, users have higher and higher requirements for steel quality and performance, especially for phosphorus in steel, and the maintenance of the dephosphorization converter bottom is smelting ultra-low This is also one of the main reasons affecting the control of the end point of the dephosphorization converter. The blowing end temperature of the dephosphorization converter is low, and the temperature in the furnace is about 1350°C. At present, the furnace lining is mainly protected by splashing slag and adding dolomite, but the slag of the dephosphorization furnace has poor adhesion and cannot adhere to the furnace wall, and most of the slag accumulates At the bottom of the furnace, it cannot pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/28C21C5/44C21C5/48
Inventor 刘延强罗磊赵长亮梅宁安泽秋王皓单伟杨晓山边吉明张丙龙袁天祥杨敬铭尹世超贾刘兵王延飞尚明洋
Owner SHOUGANG JINGTANG IRON & STEEL CO LTD
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