A production method for improving converter smelting efficiency

A production method and converter smelting technology, which is applied in the manufacture of converters, etc., can solve problems such as unfavorable furnace condition maintenance, restricting production output, and affecting production efficiency, so as to improve converter smelting efficiency, reduce converter smelting slag volume, and improve composition hit rate effect

Active Publication Date: 2021-06-11
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The raw materials of the blast furnace fluctuate greatly, and the operation is difficult. The composition of the molten iron in the blast furnace fluctuates greatly. The torpedo tanker is used to transport the molten iron. There is no mixing furnace process, and the temperature of the molten iron fluctuates greatly.
Converter smelting mainly depends on the stability of raw materials of molten iron and scrap steel. The fluctuation of raw materials brings difficulties to converter smelting. The instability of converter smelting cycle increases, which seriously affects production efficiency. The instability of production operation brings unfavorable maintenance of furnace conditions. , Oxygen lance nodules, furnace mouth sticking steel, high furnace head and many other negative effects have brought many adverse effects on production and restricted production output

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] This example provides a production method for improving converter smelting efficiency. The composition content of molten iron is C: 4.6%, Si: 0.40%, Mn: 0.15%, P: 0.129%, S: 0.030%, and the balance is Fe and not Impurities to avoid, molten iron temperature 1220°C, including the following measures:

[0054] Add ferromanganese alloy after pretreatment of molten iron to make the content ratio of manganese to silicon reach 0.9;

[0055] The converter adopts the top-bottom combined blowing mode. Lime, light-burned dolomite, and magnesium balls are added at one time 2 minutes before blowing to make slag.

[0056] When the converter blowing reaches 85%, the sub-lance measurement is carried out, and the end point control is carried out according to the sub-lance measurement results to ensure that the iron oxide content in the final smelting slag is 15% to 20%, and the manganese oxide content is 3.0% to 3.5%;

[0057] Adjust the flow rate of bottom blowing argon, and the flow r...

Embodiment 2

[0060] This example provides a production method for improving converter smelting efficiency. The composition content of molten iron is C: 4.8%, Si: 0.22%, Mn: 0.16%, P: 0.139%, S: 0.040%, and the balance is Fe and not To avoid impurities, the temperature of molten iron is 1290°C;

[0061] Add appropriate amount of ferromanganese alloy after pretreatment of molten iron, so that the content ratio of manganese to silicon reaches 1.0;

[0062] The converter adopts the top-bottom combined blowing mode. Lime, light-burned dolomite, and magnesium balls are added at one time 2 minutes before blowing to make slag.

[0063] When the converter blowing reaches 85%, the sub-lance measurement is carried out, and the end point control is carried out according to the sub-lance measurement results to ensure that the iron oxide content in the final smelting slag is 15% to 20%, and the manganese oxide content is 3.0% to 3.5%;

[0064] Adjust the flow rate of bottom blowing argon, and the flow ...

Embodiment 3

[0067] A production method for improving converter smelting efficiency provided in this example, the composition content of molten iron is C: 4.8%, Si: 0.45%, Mn: 0.12%, P: 0.139%, S: 0.040%, and the balance is Fe and not To avoid impurities, the temperature of molten iron is 1255°C;

[0068] Add appropriate amount of ferromanganese alloy after pretreatment of molten iron, so that the content ratio of manganese to silicon reaches 0.8;

[0069] The converter adopts the top-bottom combined blowing mode. Lime, light-burned dolomite, and magnesium balls are added at one time 2 minutes before blowing to make slag.

[0070] When the converter blowing reaches 85%, the sub-lance measurement is carried out, and the end point control is carried out according to the sub-lance measurement results to ensure that the iron oxide content in the final smelting slag is 15% to 20%, and the manganese oxide content is 3.0% to 3.5%;

[0071] Adjust the flow rate of bottom blowing argon, and the fl...

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PUM

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Abstract

The invention discloses a production method for improving converter smelting efficiency, and relates to the field of iron and steel smelting. If the temperature of molten iron is ≥1250°C and the silicon content is 0.10%≤Si≤0.50%, ferromanganese alloy is added after pretreatment of molten iron to make manganese silicon The content ratio reaches 0.8-1.0; if the molten iron temperature is <1250°C and the silicon content is 0.40%≤Si≤0.50%, add manganese-ferroalloy after the pretreatment of the molten iron to make the manganese-silicon content ratio reach 0.8-1.0; if the molten iron temperature is <1250 ℃ and the silicon content is 0.10%≤Si<0.40%, add manganese-ferroalloy after the molten iron pretreatment, so that the manganese-silicon content ratio reaches 1.0-1.2; by adjusting the manganese-silicon ratio of the molten iron, the molten pool temperature in the early stage of converter smelting is increased, The ability to dephosphorize the slag in the early stage is improved, the fluidity of the converter slag is promoted, the back-drying of the slag is reduced, and the dephosphorization ability in the smelting process is effectively improved.

Description

technical field [0001] The invention relates to the technical field of iron and steel smelting, in particular to a production method for improving the smelting efficiency of a converter. Background technique [0002] At present, the steel plants in the Yangtze River Economic Belt do not have their own factories, and iron ore is mainly purchased from Australia, Brazil and other places. The raw materials of the blast furnace fluctuate greatly, and the operation is difficult. The composition of the molten iron in the blast furnace fluctuates greatly. The torpedo tanker is used to transport the molten iron. There is no iron mixing furnace process, and the temperature of the molten iron fluctuates greatly. Converter smelting mainly depends on the stability of raw materials of molten iron and scrap steel. The fluctuation of raw materials brings difficulties to converter smelting. The instability of converter smelting cycle increases, which seriously affects production efficiency. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/35C22C33/06C22C38/04C22C38/02
CPCC21C5/35C22C33/06C22C38/02C22C38/04
Inventor 翟冬雨吴俊平方磊姜金星杜海军员强鹏殷杰刘帅
Owner NANJING IRON & STEEL CO LTD
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