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Method for reducing converter hot metal single consumption

A technology of molten iron and unit consumption, which is applied in the manufacture of converters, etc., can solve the problem of increasing scrap steel, and achieve the effects of reducing the unit consumption of molten iron, increasing economic benefits, and reducing production costs

Active Publication Date: 2013-07-03
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In particular, the resource market is ever-changing, and temporary molten iron shortages occur from time to time. In the case of insufficient molten iron resources, it is commonplace to increase the use of scrap steel in order to achieve production and ensure production, and it is one of the effective measures.
However, due to the increase in the amount of steel scrap added to the molten iron, the composition and temperature of the molten iron will change accordingly. How to compensate the temperature of the molten iron under the condition of eating more scrap steel to ensure the stable quality of the molten steel has become a problem. Issues to be solved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Adopt 260t converter.

[0029] The actual weight of Si in molten iron [Si] is 0.45%. The actual temperature of molten iron entering the desulfurization station is T = 1380°C, which meets the standard conditions of molten iron. Just add 50t of scrap steel to the molten iron at one time.

Embodiment 2

[0031] Adopt 260t converter.

[0032] [Si] in molten iron = 0.3%, the actual temperature T of molten iron entering the desulfurization station is 1350°C, the measures of combining silicon and carbon are adopted, the silicon content of molten iron is adjusted first, and then coke is added for temperature compensation, and the molten iron is mixed to standard conditions.

[0033] Silicon mix: Compared with the minimum limit of standard conditions, [Si] in molten iron is 0.1% less, adding 1.35kg of ferrosilicon per ton of molten iron can increase the proportion of [Si] 0.1% in molten iron, so add it to the molten iron at one time 350kg of ferrosilicon containing 67% Si.

[0034] Carbon distribution: according to the coke addition formula:

[0035] W=(1380-T)×w=(1380-1350)×40=1200kg, so add 1200kg of coke containing 90% C to the molten iron.

[0036] Among them: 960kg of coke is added in the first batch when oxygen blowing starts, and the remaining 240kg of coke is added before...

Embodiment 3

[0039] Adopt 260t converter.

[0040] [Si] in molten iron is 0.27%, and the actual temperature T of molten iron entering the desulfurization station is 1300°C. First adjust the silicon content of molten iron, and then add coke for temperature compensation.

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Abstract

The present invention provides a method for reducing converter hot metal single consumption. According to the present invention, the following conditions are adopted as the standard conditions: the Si content in the hot metal is more than or equal to 0.4%, the actual hot metal temperature T is more than or equal to 1380 DEG C; each ton of the iron is added with 180-200 kg of scrap steel; when theT is more than or equal to 1320 DEG C and less than 1380 DEG C, the treatment of silicon preparing is firstly performed, then the treatment of carbon preparing is performed, and the scrap steel is added according to the ratio when the ratio of the hot metal meets the standard conditions; when the T is more than or equal to 1280 DEG C and less than 1320 DEG C, each ton of the iron is added with 150-175 kg of the scrap steel after the ratio of the hot metal meets the standard conditions by the silicon preparing treatment and the carbon preparing treatment,. With the present invention, the combined temperature compensation manner of the ferrosilicon and the coke is adopted, such that the converter carbon temperature at the end point is basically coordinated so as to ensure the stability of the final quality of the hot metal; the use amount of the scrap steel is 20% of the total amount of the converter hot metal, such that the hot metal single consumption of the converter can be substantially reduced, the production cost is reduced when the price of the scrap steel is less than the price of the hot metal; the resource shortage can be effectively released during the hot metal shortage process, the production scale and the performance rate of the contract can be ensured.

Description

technical field [0001] The invention belongs to the technical field of steelmaking technology, and in particular relates to a method for reducing the unit consumption of molten iron in a converter steelmaking process. Background technique [0002] The temperature-raising agents used in the converter steelmaking process mainly include ferrosilicon, silicon carbide, coke, etc. The main purpose is to balance the heat source of molten iron and ensure the coordination of the control of the converter smelting end point. However, so far, there is no control method for comprehensively using ferrosilicon and coke for temperature compensation for the purpose of reducing the unit consumption of molten iron. With the improvement and refinement of management, the intensity of cost accounting is increasing. When the price of scrap steel in the market is lower than that of molten iron, increasing the amount of scrap steel added in the steelmaking process becomes an extremely effective way ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/28
Inventor 张越张志文王鹏飞王小善刘君李树斌王国涛赵小野王冠李德民
Owner ANGANG STEEL CO LTD
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