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Fast smelting method of blast furnace in-service converter

A smelting method and converter technology, applied in the field of smelting, can solve the problems of being unsuitable for the production and use of blast furnace age converters, intensified erosion of converter linings, and high content of iron oxide in slag, so as to improve the production efficiency of converters, realize scale benefits, and reduce carbon content. Effect

Inactive Publication Date: 2019-04-23
JIUJIANG PINGGANG STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] (1) Add iron-containing oxides such as iron ore, causing a large amount of heat to be absorbed, reducing the heat balance of the converter, requiring compensation for the heat, and prolonging the smelting time;
[0013] (2) After adding synthetic slag, iron ore, etc., the erosion of the converter lining is intensified, which is unfavorable to the production of the converter at the age of the blast furnace;
[0015] (4) In the process of adopting high-carbon deep dephosphorization process, the content of iron oxide in the slag is relatively high, which is not suitable for the production and use of the old blast furnace converter;

Method used

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  • Fast smelting method of blast furnace in-service converter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] Example 1: Hot metal temperature 1400°C, hot metal silicon 0.50%

[0069] The amount of steel scrap added is 30 tons, and the amount of molten iron added is 110 tons;

[0070] No slag dumping after slag splashing in the converter, scrap steel and molten iron are added to the converter, and the oxygen lance is used to blow oxygen for smelting;

[0071] After placing the oxygen lance in the converter, quickly add 1500kg of quicklime and 1200kg of lightly burned dolomite into the converter;

[0072] The position of the oxygen lance is 800-900mm. After the carbon-oxygen reaction starts, the position of the smelting lance is raised to 1200mm-1500mm, and 2500kg of quicklime is added in batches, and the addition is completed 8 minutes before smelting;

[0073] The temperature rises rapidly during the smelting process, and the iron-containing oxides are added in batches to cool down, and the addition is completed 10 minutes before the smelting.

[0074] After 10 minutes of sm...

Embodiment 2

[0077] Embodiment 2: molten iron temperature 1320°C, molten iron silicon 0.30%

[0078] 1) The amount of steel scrap added is 30 tons, and the amount of molten iron added is 113 tons;

[0079] 2) Pour out half of the slag after splashing the slag in the converter, add scrap steel and molten iron into the converter, and then put down the oxygen lance to blow oxygen for smelting;

[0080] 3) After the oxygen lance is lowered in the converter, quickly add 1200kg of quicklime weighed in advance and 1200kg of lightly burned dolomite into the converter;

[0081] 4) The position of the oxygen lance is 800-900mm. After the carbon-oxygen reaction starts, the position of the smelting lance is raised to 1200mm-1500mm, and 2000kg of quicklime is added in batches, and the addition is completed 8 minutes before smelting;

[0082] 5) After 10 minutes of smelting, start to lower the oxygen lance step by step, and the oxygen lance will be lowered to 600-700mm in 11 minutes and 30 seconds, and...

Embodiment 3

[0085] Embodiment three: molten iron temperature 1280 ℃, molten iron silicon 0.25%

[0086] 1) The amount of steel scrap added is 26 tons, and the amount of molten iron added is 115 tons;

[0087] 2) Pour out all the slag splashing in front of the converter, put scrap steel and molten iron into the converter, and put oxygen lance into it for oxygen blowing smelting;

[0088] 3) After placing the oxygen lance in the converter, quickly add 1000kg of quicklime and 800kg of lightly burned dolomite into the converter;

[0089] 4) The position of the oxygen lance is 800-900mm. After the carbon-oxygen reaction starts, the smelting lance position is raised to 1200mm-1500mm, and 2000kg of quicklime and 400kg of lightly burned dolomite are added in batches, and the addition is completed 8 minutes before smelting;

[0090] 5) After 10 minutes of smelting, start to lower the oxygen lance step by step, and the oxygen lance will be lowered to 600-700mm in 11 minutes and 30 seconds, and kee...

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Abstract

The invention relates to the technical field of smelting, in particular to a fast smelting method of a blast furnace in-service converter. The fast smelting method is characterized by comprising the following steps: S1, adding molten iron and steel scrap in the converter according to certain proportion; S2, after slag splashing of the converter, not pouring the slag, and after adding the molten iron and steel scrap in the converter, adopting an oxygen lance for oxygen blowing smelting; S3, after adopting the oxygen lance in the converter, quickly adding quick lime and light roasted dolomite weighed in advance in the converter; and S4, enabling the position level of the oxygen lance to be 800-900 mm, after carbon and oxygen reaction, raising the position level of the smelting lance to be 1200-1500 mm, and adding quick lime in batches, and adding the rest of the quick lime eight minutes before smelting. With adoption of the fast smelting method, rapid dephosphorization and temperature rise of the converter are realized, the entire smelting period can be shortened, the production efficiency of the converter is improved, and the purpose of realizing the scale benefit of the iron and steel industry is realized.

Description

technical field [0001] The invention relates to the technical field of smelting, in particular to a rapid smelting method of a blast furnace converter. Background technique [0002] In the literature search, there are mainly reports on converter smelting theory, dephosphorization, and temperature-raising production practice. In these reports, only relevant research and feedback are carried out from the aspects of thermodynamics, kinetic conditions and related influencing factors of converter smelting. , and for how to further develop and improve the method for improving the smelting speed of the converter under the blast furnace service, there is no research and report on its specific implementation plan. [0003] Patent search situation: [0004] (1) Converter smelting method [0005] Main classification number: CN1814814, this invention belongs to the technical field of iron and steel metallurgy, and specifically relates to the smelting process of implementing single sla...

Claims

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Application Information

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IPC IPC(8): C21C5/28C21C7/064C21C5/30
CPCC21C5/28C21C5/30C21C7/064Y02P10/20
Inventor 李波杨创煌彭高楚袁仕兵吕康建肖太平
Owner JIUJIANG PINGGANG STEEL
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