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Method of using aod to desulfurize molten iron

A technology for desulfurization and desilication of molten iron, applied in the direction of improving process efficiency, etc., can solve the problems of low utilization rate of pre-treatment devices outside the furnace, increased capital construction investment, low intentional benefits, etc., to reduce investment costs, flexible organization, The effect of flexible production

Active Publication Date: 2017-09-29
XINGTAI IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, as the pre-desulfurization process of molten iron, it mainly includes the injection method and the KR stirring method. These methods without exception need to increase special processing equipment and increase infrastructure investment; at the same time, because not all steel types require low sulfur content, resulting in The utilization rate of the built pretreatment device outside the furnace is not high, and the benefit is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1: The specific process of the method for using AOD to desulfurize molten iron is as follows.

[0022] (1) Initial conditions: the amount of molten iron is 45 tons, the initial temperature of the molten iron is 1150°C, the initial sulfur content of the molten iron is 470ppm, and the initial silicon content of the molten iron is 0.97wt%.

[0023] (2) Desulfurization process and calculation process: the total flow of oxygen is 1.96m per ton of iron 3 / min, among which, the oxygen flow rate of the top gun is 80m 3 / min, side gun oxygen flow 8m 3 / min, side gun nitrogen flow 12m 3 / minute;

[0024] Calculate the desiliconization amount according to the target molten iron temperature of 1380°C = (1380-1150) / 250*45*10=414 (kg);

[0025] Corresponding oxygen blowing volume=414*0.98=405.7m 3 ;

[0026] Corresponding lime addition = 414*2.14*1.8 / 0.88=1812.2 (kg);

[0027] Corresponding fluorite addition amount=1812.2*0.25=453 (kg);

[0028] Corresponding oxyge...

Embodiment 2

[0030] Embodiment 2: The specific process of the method for using AOD to desulfurize molten iron is as follows.

[0031] (1) Initial conditions: the amount of molten iron is 45 tons, the initial temperature of the molten iron is 1145°C, the initial sulfur content of the molten iron is 480ppm, and the initial silicon content of the molten iron is 0.96wt%.

[0032] (2) Desulfurization process and calculation process: the total flow of oxygen is 1.89m per ton of iron 3 / min, among which, the oxygen flow rate of the top gun is 80m 3 / min, side gun oxygen flow 8m 3 / min, side gun nitrogen flow 20m 3 / minute;

[0033] According to the target molten iron temperature of 1400°C, calculate the desiliconization amount = (1400-1145) / 280*45*10=409.8 (kg);

[0034] Corresponding oxygen blowing volume=409.8*0.90=368.8m 3 ;

[0035] Corresponding lime addition = 409.8*2.14*1.7 / 0.88=1694.2 (kg);

[0036] Corresponding fluorite addition amount=1694.2*0.30=508.3 (kg);

[0037] Correspond...

Embodiment 3

[0039] Embodiment 3: The specific process of the method of using AOD to desulfurize molten iron is as follows.

[0040] (1) Initial conditions: the amount of molten iron is 45 tons, the initial temperature of the molten iron is 1152°C, the initial sulfur content of the molten iron is 476ppm, and the initial silicon content of the molten iron is 0.98wt%.

[0041] (2) Desulfurization process and calculation process: the total flow rate of oxygen is 2.3m per ton of iron 3 / min, among which, the oxygen flow rate of the top gun is 90m 3 / min, side gun oxygen flow 10m 3 / min, side gun nitrogen flow 20m 3 / minute;

[0042] Calculate the desiliconization amount according to the target molten iron temperature of 1430°C = (1430-1152) / 260*45*10=481.2 (kg);

[0043] Corresponding oxygen blowing volume=481.2*1.0=481.2m 3 ;

[0044] Corresponding lime addition = 481.2*2.14*1.8 / 0.88=2106.3 (kg);

[0045] Corresponding fluorite addition amount=2106.3*0.20=421.3 (kg);

[0046] Correspo...

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Abstract

The invention discloses a method for conducting molten iron desulphurization through AOD. The method technology includes the steps that oxygen blowing desulphurization is carried out through an AOD furnace in the manners of top blowing and side blowing at the same time, and the oxygen blowing quantity is calculated according to the terminal temperature ranging from 1380 DEG C to 1430 DEG C; lime is added while oxygen blowing is started, the adding quantity is calculated according to the alkalinity ranging from 1.7 to 1.9, and then fluorite and / or bauxite accounting for 20%-30% of the quantity of the lime are / is added; Si remaining after oxygen blowing is controlled to be larger than or equal to 0.1 weight percent; and oxygen supplying is stopped after the oxygen blowing quantity reaches a preset value, and meanwhile side blowing gas is changed into nitrogen for stirring and turning down. A metallurgy function of the AOD furnace is utilized in the method, thermodynamics and kinetics conditions of molten iron pre-desulfurization are met to the maximum degree, the sulfur element (not larger than 1000 ppm) in the molten iron can be reduced to be smaller than 20 ppm, and the desulphurization efficiency is 97% or higher and reaches or exceeds the level of a KR method.

Description

technical field [0001] The invention relates to a method for pretreatment of molten iron, in particular to a method for desulfurizing molten iron by using AOD. Background technique [0002] With the continuous improvement of product quality in some iron and steel production plants, some steel types have lower and lower requirements for [S] element content, so that traditional converter desulfurization alone is difficult to meet the needs of quality improvement. For this reason, relying on molten iron pretreatment to reduce the sulfur content of molten iron and then reduce the sulfur content of steel has become a common practice. [0003] At present, as the pre-desulfurization process of molten iron, it mainly includes the injection method and the KR stirring method. These methods without exception need to increase special processing equipment and increase infrastructure investment; at the same time, because not all steel types require low sulfur content, resulting in The ut...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/064
CPCC21C7/064Y02P10/20
Inventor 曹红波吴广海胡黎宁王郢韩清连冯文甫郭志彬黄翠环李智
Owner XINGTAI IRON & STEEL
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