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Method for increasing cold charge ratio of converter and reducing molten iron consumption

A converter and cold charge technology, applied in the manufacture of converters, lime production, etc., can solve the problem of not fully considering the compressive strength of briquettes' volatile binders, insufficient molten iron supply, and converter steelmaking output and molten iron supply. Production needs and other issues, to achieve the effect of strengthening process coordination, reducing lime consumption, good economic and social benefits

Pending Publication Date: 2022-03-25
SHANDONG LAIGANG YONGFENG STEEL & IRON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there are several technical problems as follows: 1) The existing supply of molten iron is far from meeting the production needs of converter steelmaking, and the insufficient supply of molten iron has always been the main problem that plagues the increase of converter steelmaking output; 2) The cooling capacity cannot be adjusted quickly. 3) The physical and chemical indicators of briquettes are not considered comprehensively, and the compressive strength of the volatile binder in briquettes is not fully considered

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044]Embodiment 1 provides a method for increasing the cold material ratio of the converter and reducing the consumption of molten iron, and increasing the temperature of the molten iron entering the converter to 1400°C to increase the heat in the converter by increasing the physical heat;

[0045] Adopt pig iron instead of steel scrap to increase the heat in the converter by increasing chemical heat, the quality of cold material: the quality of molten iron=280:790, the addition of pig iron is 10Kg / t, and the addition of scrap is 10Kg / t;

[0046] During the smelting process, carbonaceous exothermic agent is added to the converter to increase heat income. The carbonaceous exothermic agent is briquettes. In furnaces where the temperature of molten iron is lower than 1260°C and the silicon content is less than 0.40wt%, 11Kg / t of briquettes;

[0047] Lower the tapping temperature of the converter to 1610°C to reduce the heat expenditure of the converter;

[0048] Improve the ox...

Embodiment 2

[0052] Embodiment 2 provides a method of increasing the cold material ratio of the converter and reducing the consumption of molten iron, and raising the temperature of the molten iron entering the converter to 1420°C to increase the heat in the converter by increasing the physical heat;

[0053] Adopt pig iron instead of steel scrap to increase the heat in the converter by increasing chemical heat, the quality of cold material: the quality of molten iron=280:790, the addition of pig iron is 12Kg / t, and the addition of scrap is 11Kg / t;

[0054] In the smelting process, carbonaceous heating agent is added to the converter to increase heat income. The carbonaceous heating agent is coal pellets. In furnaces where the temperature of molten iron is lower than 1260°C and the silicon content is less than 0.40wt%, add 12Kg / t of briquettes;

[0055] Lower the tapping temperature of the converter to 1600°C to reduce the heat expenditure of the converter;

[0056] Improve the oxygen su...

Embodiment 3

[0060] Embodiment 3 provides a method for increasing the cold material ratio of the converter and reducing the consumption of molten iron, and increasing the temperature of the molten iron entering the converter to 1420°C to increase the heat in the converter by increasing physical heat;

[0061] Adopt pig iron instead of steel scrap to increase the heat in the converter by increasing chemical heat, the quality of cold material: the quality of molten iron=280:790, the addition of pig iron is 12Kg / t, and the addition of scrap is 8Kg / t;

[0062] In the smelting process, carbonaceous heating agent is added to the converter to increase heat income. The carbonaceous heating agent is coal pellets. In furnaces where the temperature of molten iron is lower than 1260°C and the silicon content is less than 0.40wt%, add 12Kg / t of briquettes;

[0063] Lower the tapping temperature of the converter to 1600°C to reduce the heat expenditure of the converter;

[0064] Improve the oxygen sup...

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Abstract

According to the method for increasing the cold charge ratio of the converter and reducing the consumption of the molten iron, the heat income of the converter is increased by increasing the charging temperature of the molten iron of the converter, replacing the vast majority of scrap steel with pig iron and adding a carbonaceous heat generating agent into the converter, and the heat expenditure is reduced by reducing the tapping temperature; the heat balance of the converter is realized; in order to eliminate the negative influence of the improvement on the normal and stable production of the converter, the slagging system, the oxygen supply system and the temperature system of the converter are adaptively improved, the lime consumption is reduced, and a low-temperature smelting project is realized; according to the invention, the molten iron consumption is reduced from 859.33 Kg / t steel to 788.23 Kg / t steel at present, so that the steel yield is obviously increased under the condition of not increasing any equipment, and good economic benefits and social benefits are obtained.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, in particular to a method for increasing the cold material ratio of a converter and reducing the consumption of molten iron. Background technique [0002] Some iron and steel enterprises are limited by the shortage of iron ore resources, and the supply of molten iron has always been a restrictive link. Generally speaking, the steelmaking production capacity is greater than the ironmaking production capacity, but the cold material ratio of the converter has been relatively low due to various reasons. Therefore, the research and development of technology to increase the ratio of cold material is an extremely important measure to solve the shortage of molten iron supply. On the other hand, with the role of market regulation, the price of scrap steel will be significantly lower than the price of hot metal in stages, so it is necessary for iron and steel enterprises to carry out tech...

Claims

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Application Information

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IPC IPC(8): C21C5/28C21C5/32
CPCC21C5/28C21C5/32Y02P40/40
Inventor 李晓龙刘晓东尹兴彬孙怀彬蒋毅苏庆林
Owner SHANDONG LAIGANG YONGFENG STEEL & IRON