A kind of method for reducing tfe content in converter final slag

A technology of final slag and content, applied in the field of iron and steel metallurgy, can solve the problems of rising use cost of converter refractories, corrosion of furnace lining, poor effect of slag splashing to protect the furnace, etc. Effect

Active Publication Date: 2022-08-05
SHANDONG IRON & STEEL GRP YONGFENG LINGANG CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The low content of TFe in the final slag of the converter will affect the slag removal effect of the converter and the control of the final composition of the converter, the number of times the converter is reversed, the peroxidation of molten steel, and the high consumption of steel materials; the high content of TFe in the final slag of the converter will cause a large amount of metal loss , high consumption of iron and steel materials, good slag fluidity, poor protection effect of slag splashing, severe lining erosion, rising cost of converter refractories, etc.
Therefore, the control target range of TFe (∑FeO, MFe) content in the iron and steel industry has not yet reached the optimal cost-effective matching and effective control method

Method used

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  • A kind of method for reducing tfe content in converter final slag
  • A kind of method for reducing tfe content in converter final slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0077] Embodiment 1 provides a method for reducing the TFe content in the final converter slag, comprising the following steps in sequence:

[0078] 1) The semi-oxygen automatic blowing mode is adopted 1.5 minutes before the dry dust removal and blowing. After the semi-oxygen is completed, according to the physical and chemical indicators of molten iron and scrap steel and the charging system, the oxygen supply operation with low gun position and high oxygen pressure is adopted to achieve the thermodynamics of slag removal. A benign match with dynamics;

[0079] The batch, amount and timing of adding slag-forming materials perform the slag-retaining operation in the converter blowing model;

[0080] In step 1), the oxygen supply operation using low gun position and high oxygen pressure is specifically: the low gun position is 1.1m, and the working oxygen pressure is ≥0.95Mpa;

[0081] 2) After blowing for 3.5min-4min, when the CO concentration curve slopes upward, carry out t...

Embodiment 2

[0100] Embodiment 2 provides a method for reducing the TFe content in the converter final slag, comprising the following steps of performing in sequence:

[0101] 1) The semi-oxygen automatic blowing mode is adopted 1.5 minutes before the dry dust removal and blowing. After the semi-oxygen is completed, according to the physical and chemical indicators of molten iron and scrap steel and the charging system, the oxygen supply operation with low gun position and high oxygen pressure is adopted to achieve the thermodynamics of slag removal. A benign match with dynamics;

[0102] The batch, amount and timing of adding slag-forming materials perform the slag-retaining operation in the converter blowing model;

[0103] In step 1), the oxygen supply operation using low gun position and high oxygen pressure is specifically: the low gun position is 1.2m, and the working oxygen pressure is ≥ 0.95Mpa;

[0104] 2) After blowing for 3.5min-4min, when the CO concentration curve slopes upwa...

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Abstract

This application provides a method to reduce the tFE content in the final residue of the turntable. The oxygen supply and slag manufacturing system adopts the combination and complement of the intelligent steelmaking push mode and experience operation.The effect of peak operations, full -process residue stability, and final residue effect during the sensitive period of the sensitive period to ensure that the smelting process is controlled; the high -strength operation of the furnace blowing at the bottom of the stove, high -efficiency nitrogen slag operation before the furnace, steel out of steel, and steel out of steelAdd the slag ball to achieve the use of auxiliary means to further reduce the final slag TFE content on the basis of the conventional blowing process operation.%, Limestone consumption is reduced by no less than 5kg / T. The content of the remaining steel water manganese is increased by 0.03WT%, the content of the end steel water C content increases by 0.02WT%, and the cost of tons of steel is reduced by 18.76 yuan / t.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, in particular to a method for reducing the TFe content in final converter slag. Background technique [0002] In the converter smelting process, the TFe content in the final slag is an important technical and economic indicator reflecting the level of smelting control. The reduction of TFe content in the final slag is beneficial to reduce the burning loss of metallic iron, improve the yield of molten steel, reduce the consumption of steel materials, reduce the oxidation of molten steel to improve the cleanliness of molten steel and the yield of alloy, and the degree of corrosion of furnace lining will also be somewhat weakened. [0003] In the control of converter smelting, theoretically, the TFe content of the slag at the initial stage of blowing should be increased to rapidly slag, and the TFe content of the slag should be reduced at the end of the blowing process, so as to r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/36C21C5/30
CPCY02P10/20
Inventor 李生根刘强满孝秦武胜可吴峰怀其冬李勇
Owner SHANDONG IRON & STEEL GRP YONGFENG LINGANG CO LTD
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