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Method for judging opportunity of lifting lance to pour away converter double slag

A converter and timing technology, which is applied in the manufacture of converters, etc., can solve the problems of large deviation, low success rate, judging the timing of double slag lifting of converters, etc., and achieves the effect of accurate judgment and significant economic benefits

Active Publication Date: 2015-12-23
TANGSHAN STAINLESS STEEL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the complexity of the melt pool reaction in the early stage of blowing and the change of raw material conditions such as molten iron, the success rate is not high; some steel mills use manual observation of the flame change at the furnace mouth to determine the timing of lifting the gun, and there is a large deviation in judgment based on human experience
So far, there is no particularly effective method for judging the timing of double slag lifting of the converter. Accurately judging the timing of double slag lifting of the converter has become a difficult problem for various iron and steel enterprises, which needs to be solved by professional technicians and workers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 100 tons of converter double slag smelting, furnace input conditions: molten iron C4.23%, Si0.76%, P0.133%, Ti0.018%, molten iron temperature 1320 ℃. The weight of molten iron is 105.3 tons, and the weight of scrap steel is 15.2 tons.

[0033] Double slag target alkalinity target 1.4, temperature target 1345 ℃ blowing target; through calculation, lime addition is 1.2 tons, limestone addition is 1.1 tons, ore addition is 2.9 tons; oxygen supply intensity is 3.0m3 / (min·t steel ), gun position 2.9m.

[0034] When the oxygen blowing rate of the converter reaches 14.2%, the flue gas analysis system shows that the CO concentration starts to rise, and when the oxygen blowing rate reaches 23.3%, the CO concentration reaches 27%, and double slag is produced by raising the gun. The measured melting pool temperature was 1355°C, the slag was well melted, and the furnace and slag pouring went smoothly.

Embodiment 2

[0036] 100 tons of converter double slag smelting, furnace input conditions: molten iron C4.31%, Si0.84%, P0.127%, Ti0.138%, molten iron temperature 1337 ℃. The molten iron weighs 102.3 tons, and the steel scrap weighs 8.3 tons.

[0037] Double slag target alkalinity target 1.4, temperature target 1345 ℃ blowing target; through calculation, lime addition is 1.4 tons, limestone addition is 1.2 tons, ore addition is 3.4 tons; oxygen supply intensity is 2.9m3 / (min·t steel ), gun position 2.7m.

[0038] When the oxygen blowing rate of the converter reaches 14.6%, the flue gas analysis system shows that the CO concentration starts to rise, and when the oxygen blowing rate reaches 20.8%, the CO concentration reaches 23%, and double slag is produced by raising the gun. The measured melting pool temperature was 1340°C, the slag was well melted, and the furnace and slag pouring went smoothly.

Embodiment 3

[0040] 100 tons of converter double slag smelting, furnace input conditions: molten iron C4.26%, Si0.89%, P0.127%, Ti0.155%, molten iron temperature 1401 ℃. The molten iron weighs 102.3 tons, and the steel scrap weighs 11.6 tons.

[0041] Double slag target alkalinity target 1.8, temperature target 1345 ℃ blowing target; through calculation, the amount of lime added is 2.6 tons, the amount of limestone added is 1.4 tons, and the amount of ore added is 3.2 tons; the oxygen supply intensity is 2.9m3 / (min·t steel ), gun position 2.7m.

[0042] When the oxygen blowing rate of the converter reaches 17.6%, the flue gas analysis system shows that the CO concentration starts to rise, and when the oxygen blowing rate reaches 27.9%, the CO concentration reaches 25.36%, and double slag is produced by raising the gun. The measured molten pool temperature was 1346°C, the slag was well melted, and the furnace and slag pouring went smoothly.

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Abstract

A method for judging an opportunity of lifting a lance to pour away converter double slag belongs to the technical field of converter steelmaking operation methods, and is used for accurately judging the opportunity of lifting the lance to pour away converter double slag. The technical scheme adopted by the method is that the temperature of a molten pool is determined by using a carbon monoxide curve in converter flue gas analysis equipment and is taken as a judgment basis of the opportunity of lifting the lance to pour away converter double slag, and when condition that the concentration of CO reaches the interval from 22% t0 28% is shown by the flue gas analysis equipment, the lance is lifted to pour away double slag. The method has the characteristic of accurately judging the temperature of the molten pool to judge the opportunity of lifting the lance to pour away double slag, and avoids the problems that after the lance is lifted to pour away double slag, since the temperature of the molten pool is low, lime is difficult to melt, and slag iron cannot be separated, or the temperature of the molten pool is too high, carbon in the molten pool react drastically to cause serious slag bubblization and difficult turning down of a converter. The method is an innovation in the converter steelmaking method, especially effectively judges the opportunity of lifting the lance to pour away converter double slag, solves the problems, which are puzzled for a long time and not solved by various iron and steel enterprises, and has a remarkable economic benefit.

Description

technical field [0001] The invention relates to a method for judging the timing of double slag lifting of a converter, and belongs to the technical field of converter steelmaking operation methods. Background technique [0002] Converter double slag is widely used as a process to treat silicon-rich molten iron and reduce steelmaking costs. When the molten iron silicon exceeds 0.7%, the probability of explosive splashing in the converter increases significantly, and various consumption indicators such as steel material consumption deteriorate significantly. The amount of slag can be reduced through double slag, reducing the risk of splashing. For conventional molten iron with low silicon content, some factories adopt the production method of leaving slag and double slag to reduce production costs. [0003] Converter double slag operation is to control the alkalinity in the early stage of blowing to between 1.3-1.8, adopt a suitable oxygen supply system, and when the temperat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/28
Inventor 周泉林李阳邢金栋李鹏刘海波王肖周航赵铁成
Owner TANGSHAN STAINLESS STEEL