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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  • 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 intens

Method used

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  • Fast smelting method of blast furnace in-service converter

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0068] Example 1: Hot metal temperature 1400℃, molten iron silicon 0.50%

[0069] 30 tons of scrap steel and 110 tons of molten iron;

[0070] After splashing the slag in the converter, do not pour the slag. After the scrap steel and molten iron are added to the converter, the oxygen lance blows oxygen for smelting;

[0071] After the oxygen lance is installed in the converter, quickly add 1500kg of quicklime weighed in advance and 1200kg of light burned dolomite into the converter;

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

[0073] During the smelting process, the temperature rises quickly. Iron oxides are added in batches to cool down, and the addition is completed 10 minutes before smelting.

[0074] After 10 minutes of smelting, start to lower the oxygen lance gradually, apply th...

Example Embodiment

[0077] Example 2: The temperature of molten iron is 1320℃, and the molten iron silicon is 0.30%

[0078] 1) 30 tons of scrap steel and 113 tons of molten iron;

[0079] 2) Pour half of the slag after splashing the slag in the converter. After the scrap steel and molten iron are added to the converter, the oxygen lance is used to blow oxygen for smelting;

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

[0081] 4) Oxygen lance position 800-900mm, after the carbon-oxygen reaction starts, the smelting lance position is increased to 1200mm-1500mm, and 2000kg 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 gradually, apply the oxygen lance to 600-700mm in 11 minutes and 30 seconds, and keep the position of the oxygen lance unchanged for more than 40 seconds.

[0...

Example Embodiment

[0085] Example 3: The molten iron temperature is 1280℃, the molten iron silicon is 0.25%

[0086] 1) 26 tons of scrap steel and 115 tons of molten iron;

[0087] 2) Pour all the slag splashing in the converter before the furnace, and after the scrap steel and molten iron are added to the converter, the oxygen lance blows oxygen for smelting;

[0088] 3) After the oxygen lance is installed in the converter, quickly add the pre-weighed 1000kg quicklime and 800kg light-burned dolomite into the converter;

[0089] 4) Oxygen lance position 800-900mm, after the carbon-oxygen reaction starts, the smelting lance position is increased to 1200mm-1500mm, and 2000kg quicklime and 400kg light-burned dolomite are added in batches, and the addition is finished 8 minutes before smelting;

[0090] 5) After 10 minutes of smelting, start to lower the oxygen lance gradually, apply the oxygen lance to 600-700mm in 11 minutes and 30 seconds, and keep the position of the oxygen lance unchanged for more than 4...

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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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