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Operation method for adding modifier before tapping

An operation method and modifier technology, applied in the manufacture of converters, etc., can solve the problems of increased nitrogen consumption in slag splashing, incomplete slag splashing, high consumption of slag splashing in strong oxidizing slag, etc., to achieve strengthening effect and improve slag splashing efficiency , The effect of reducing the consumption of slag splashing slag

Active Publication Date: 2014-07-30
SHOUGANG JINGTANG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The slag at the end of converter smelting is called the final slag. The Tfe content of total iron in the final slag of the converter is an important indicator to measure the oxidation of the final slag. Under normal production conditions, the Tfe data of the final slag of the converter fluctuates between 10% and 30%. Higher, the stronger the oxidizing property of the final slag of the converter, the stronger oxidizing property directly affects the slag splashing protection operation of the next furnace, resulting in an increase in the consumption of modifiers for slag splashing, auxiliary raw materials such as light-burned dolomite and slag splashing nitrogen, More importantly, under the operating conditions of leaving slag, the highly oxidizing slag is not easy to splash dry, and there is a safety hazard of splashing during the iron mixing process
In the existing steelmaking process, strong oxidizing slag splashing consumes a lot of slag, and the slag splashing is not complete

Method used

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  • Operation method for adding modifier before tapping

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] experiment one

[0036] When α≤800ppm, the dose of modifier added before tapping is 500kg; at this time, the reaction dose can be guaranteed to realize the pre-deoxidation of the converter final slag, and the minimum demand can be guaranteed under the premise of uniform mixing.

[0037] The content of magnesium oxide MgO is 60%, which ensures that the content of magnesium oxide MgO in the slag is at a high level and fully saturated, and the dissolved amount of magnesium oxide MgO in the furnace lining is lower, so as to ensure that the furnace lining has better anti-corrosion ability and achieve enhanced slag splashing Furnace protection effect; at the same time, the slag has good viscosity, can be stably attached to the furnace wall, enhances its anti-corrosion ability, and strengthens the ability of slag splashing to protect the furnace.

[0038] The content of carbon C in the modifier is 15%. On the premise of uniform mixing, sufficient carbon-oxygen reaction can be ...

Embodiment 2

[0051] Experiment four

[0052] When 800ppm<α≤900ppm, the dose of modifier added before tapping is 1000kg; at this time, the reaction dose can be guaranteed to realize the pre-deoxidation of the converter final slag, and the minimum demand can be guaranteed under the premise of uniform mixing.

[0053] The content of magnesium oxide MgO is 60%, which ensures that the content of magnesium oxide MgO in the slag is at a high level and fully saturated, and the dissolved amount of magnesium oxide MgO in the furnace lining is lower, so as to ensure that the furnace lining has better anti-corrosion ability and achieve enhanced slag splashing Furnace protection effect; at the same time, the slag has good viscosity, can be stably attached to the furnace wall, enhances its anti-corrosion ability, and strengthens the ability of slag splashing to protect the furnace.

[0054] The content of carbon C in the modifier is 15%. On the premise of uniform mixing, sufficient carbon-oxygen reactio...

Embodiment 3

[0067] Experiment seven

[0068] When 900ppm<α≤1000ppm, the dose of modifier added before tapping is 1500kg; at this time, the reaction dose can be guaranteed to realize the pre-deoxidation of the converter final slag, and the minimum demand can be guaranteed under the premise of uniform mixing.

[0069] The content of magnesium oxide MgO is 60%, which ensures that the content of magnesium oxide MgO in the slag is at a high level and fully saturated, and the dissolved amount of magnesium oxide MgO in the furnace lining is lower, so as to ensure that the furnace lining has better anti-corrosion ability and achieve enhanced slag splashing Furnace protection effect; at the same time, the slag has good viscosity, can be stably attached to the furnace wall, enhances its anti-corrosion ability, and strengthens the ability of slag splashing to protect the furnace.

[0070] The content of carbon C in the modifier is 15%. On the premise of uniform mixing, sufficient carbon-oxygen react...

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Abstract

The invention belongs to the technical field of steel making, and discloses an operation method for adding a modifier before tapping. The operation method comprises the following steps: performing converter smelting to an end point for catch carbon; measuring the content alpha of oxygen at the end point; according to the content alpha of oxygen at the end point, adding the modifier in a converter; performing converter tapping operation; after the converter tapping is over, carrying out slag splashing converter protection operation, wherein when alpha is less than or equal to 800ppm, the modifier added before tapping ranges from 500kg to 1000kg; when alpha is more than 800ppm and less than or equal to 900ppm, the modifier added before tapping ranges from 1000kg to 1500kg; when alpha is more than 900ppm and less than or equal to 1000ppm, the modifier added before tapping ranges from 1500kg to 2000kg; when alpha is more than 1000ppm, the modifier added before tapping ranges from 2000kg to 2500kg; and for all after-blow converters, the modifier added before tapping ranges from 1500kg to 2000kg. By utilizing the method for adding the modifier, the difficulties that the strongly oxidized converter slag splashing consumption is high and splashing is not dry can be solved, and an excellent effect can be achieved.

Description

technical field [0001] The invention relates to the technical field of steelmaking technology, in particular to an operation method for adding a modifier before tapping. Background technique [0002] At present, the competition among iron and steel enterprises is becoming increasingly fierce. In this situation, it is particularly important to reduce consumption and control production costs. In the converter steelmaking process, oxygen is blown into the furnace, and the oxygen reacts with the auxiliary raw materials added to the furnace: lime, light-burned dolomite, sintered ore, etc. to form converter slag, which is mixed with the furnace under the agitation of the oxygen stream. The molten iron undergoes a chemical reaction, and finally realizes functions such as carbon removal and inclusion removal. [0003] The slag at the end of converter smelting is called the final slag. The Tfe content of total iron in the final slag of the converter is an important indicator to meas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/28C21C5/36
Inventor 王建斌袁天祥高宠光李勇边吉明罗伯钢李金柱苏震霆张丙龙田志红彭国仲赵长亮郭小龙
Owner SHOUGANG JINGTANG IRON & STEEL CO LTD