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Method for removing phosphorus in converter through blowing nitrogen

A converter and phosphorus method technology, applied in the manufacture of converters, etc., can solve the problems of unfavorable smelting costs, reduction, maintenance of unfavorable furnace conditions and billet quality, etc., and achieve a good dephosphorization effect

Inactive Publication Date: 2015-09-23
JIANGSU YONGGANG GROUP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, oxygen blowing and slagging are generally used to remove phosphorus in converter molten steel dephosphorization. In the manual control of converter operation, when the phosphorus content in a pour of molten steel is greater than 0.030%, it is necessary to continue to blow oxygen and slag to the smelted molten steel. Further dephosphorization, but the above method will also cause the molten steel to be overoxidized due to decarburization in the process of dephosphorization, because the peroxidation of molten steel is not only not conducive to the maintenance of furnace conditions and the improvement of billet quality, but also is not conducive to the reduction of smelting costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The nitrogen blowing and dephosphorization method in the converter furnace includes the following steps:

[0018] (1) When the first pouring temperature is 1660℃, the phosphorus content of the first pouring molten steel is 0.030%, and the slag fluidity is good, change the oxygen lance to nitrogen blowing, and control the nitrogen flow at 11500m 3 / h;

[0019] (2) Then lower the oxygen lance to the low blowing position;

[0020] (3) Then open the oxygen lance for 20s, so that the oxygen lance can blow nitrogen and dephosphorize the molten steel in the converter furnace.

Embodiment 2

[0022] The nitrogen blowing and dephosphorization method in the converter furnace includes the following steps:

[0023] (1) When the first pouring temperature is 1670℃, the phosphorus content of the first pouring molten steel is 0.045%, and the slag fluidity is good, the oxygen lance is changed to nitrogen blowing, and the nitrogen flow is controlled at 12000m 3 / h;

[0024] (2) Then lower the oxygen lance to the low blowing position;

[0025] (3) Then open the oxygen lance for 30s, so that the oxygen lance can blow nitrogen and dephosphorize the molten steel in the converter furnace.

Embodiment 3

[0027] The nitrogen blowing and dephosphorization method in the converter furnace includes the following steps:

[0028] (1) When the first pouring temperature is 1680℃, the phosphorus content of the first pouring molten steel is 0.060%, and the fluidity of the slag is good, the oxygen lance is changed to nitrogen blowing, and the nitrogen flow is controlled at 12500m 3 / h;

[0029] (2) Then lower the oxygen lance to the low blowing position;

[0030] (3) Then open the oxygen lance for 40s, so that the oxygen lance can blow nitrogen and dephosphorize the molten steel in the converter furnace.

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Abstract

The invention discloses a method for removing phosphorus in a converter through blowing nitrogen. The method comprises the following steps: (1), when the first-pouring temperature is larger than 1660 DEG C, first-pouring molten steel contains 0.030-0.060% of phosphorus, and meanwhile, the liquidity of furnace slag is good, oxygen blowing by an oxygen gun is changed into nitrogen blowing and nitrogen flow is controlled to be 11500-12500 m<3> / h; (2), the oxygen gun is dropped to a converting low gun position; (3), the oxygen gun is opened for 20-40 s, so as to enable the oxygen gun to remove phosphorus from the smelting molten steel in the converter through blowing nitrogen. The method has the advantages that average temperature drop can reach 1 DEG C per second, the average phosphorus removal ratio is 0.015%, the phosphorus removal effect is good and the peroxidating phenomenon of molten steel does not occur in a phosphorus removal process.

Description

technical field [0001] The invention relates to a nitrogen blowing and dephosphorization method for smelting molten steel in a converter furnace. Background technique [0002] The first downturn (referred to as "one down") is a pause in the converter smelting process. The purpose of one downfall is to understand the smelting process in the converter at this time, such as the molten steel temperature (the detected molten steel temperature is referred to as "one down" for short). One pour temperature), molten steel composition (the phosphorus content in the molten steel obtained by one pour detection is referred to as the one pour molten steel phosphorus content), slag conditions, etc., to determine the accurate control of the tapping conditions. At present, the dephosphorization of molten steel in converters generally uses oxygen blowing, slag making and other methods to remove phosphorus. In the manual control of converter operation, when the phosphorus content of molten ste...

Claims

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Application Information

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IPC IPC(8): C21C5/30
Inventor 李尚兵李伟甘智聪
Owner JIANGSU YONGGANG GROUP CO LTD
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