Dephosphorization converter blowing control method

A dephosphorization converter and control method technology, applied in the direction of manufacturing converters, etc., can solve the problems of difficult melting of dephosphorization converter scrap steel, low lime utilization rate, unbalanced reaction, etc., to improve normal production process indicators, reduce TFe content, The effect of improving quality

Active Publication Date: 2017-03-15
SHOUGANG JINGTANG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention provides a dephosphorization converter blowing control method, which solves the problems in the prior art that the dephosphorization converter scrap steel is difficult to melt, the dephosphorization rate is low, the lime utilization rate is low, and the final slag FeO of the dephosphorization rate is too high. Balancing Technical Issues

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The temperature of the molten iron entering the furnace is 1352°C, the molten iron C: 4.37%, the molten iron Si: 0.13%, the molten iron Mn: 0.17%, the molten iron P: 0.097%, the molten iron S: 0.0004%, and the oxygen supply flow rate of the blowing is 30000Nm 3 / h, adjusted to 20000Nm after 2.2 minutes 3 / h, adjusted to 120000Nm in the last 1.5 minutes 3 / h, the total oxygen supply time is 5min, and the oxygen pressure is controlled at 0.9MPa; the gun position is 2 meters in the first 2.2 minutes, and 1.4 meters in the later period until the end of blowing. The end temperature of the converter is 1332°C, semi-steel C: 3.26%, semi-steel P: 0.024%, final slag basicity is 1.8, and final slag TFe is 9.87%.

Embodiment 2

[0038] The temperature of the molten iron entering the furnace is 1321°C, the molten iron C: 4.32%, the molten iron Si: 0.21%, the molten iron Mn: 0.21%, the molten iron P: 0.111%, the molten iron S: 0.0009%, and the flow rate of oxygen supply for blowing is 33000Nm 3 / h, adjusted to 25000Nm after 2.5 minutes 3 / h, adjusted to 120000Nm in the last 2 minutes 3 / h, the total oxygen supply time is 6min, and the oxygen pressure is controlled at 0.5MPa; the gun position is 2 meters in the first 2.5 minutes, and 1.4 meters in the later period until the end of blowing. The end temperature of the converter is 1322°C, semi-steel C: 3.37%, semi-steel P: 0.021%, final slag basicity is 2.2, and final slag TFe is 6.54%.

Embodiment 3

[0040] The temperature of the molten iron entering the furnace is 1413°C, the molten iron C: 4.57%, the molten iron Si: 0.32%, the molten iron Mn: 0.23%, the molten iron P: 0.104%, the molten iron S: 0.0003%, and the flow rate of oxygen supply for blowing is 35000Nm 3 / h, adjusted to 25000Nm after 2.5 minutes 3 / h, adjusted to 150000Nm in the last 2 minutes 3 / h, the total oxygen supply time is 5.5min, and the oxygen pressure is controlled at 0.7MPa; the gun position is 2 meters in the first 2.5 minutes, and 1.4 meters in the later period until the end of blowing. The end temperature of the converter is 1348°C, the semi-steel C: 3.45%, the semi-steel P: 0.022%, the final slag basicity is 2.0, and the final slag TFe is 7.93%.

[0041] One or more technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:

[0042] 1. The dephosphorization converter blowing control method provided in the embodiment of th...

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PUM

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Abstract

The invention discloses a dephosphorization converter blowing control method and belongs to the technical field of steelmaking. The method comprises top-blown oxygen supply flow control and gun position control during blowing, wherein in early blowing, controlled oxygen supply flow is 30000-35000 Nm<3> / h, the oxygen supply flow is adjusted to 20000-25000 Nm<3> / h 2-3 min after blowing and is adjusted to 12000-15000 Nm<3> / h 2-3 min before the end; in early stage, gun position is controlled to 2 meters and is adjusted to 1.4 meters 2-3 minutes after the early stage until blowing is ended. Through oxygen supply flow and gun position controlling during blowing, it is possible to guarantee full melting of waste steel, dephosphorization smelting final slag is 1.8-2.2 in alkalinity, element P content at the end of dephosphorization smelting is averagely up to 0.025%, dephosphorization rate is increased, TFe content of the final slag is lowered, low-cost dephosphorization converter smelting is achieved, the production target high efficiency is achieved, and the temperature requirement of semi-steel is unaffected.

Description

technical field [0001] The invention relates to the technical field of steelmaking, in particular to a dephosphorization converter blowing control method. Background technique [0002] With the development of society, higher requirements are put forward for the service performance, processing performance and material life of steel products. In order to improve steel quality and reduce production costs, since the beginning of the 20th century, Nippon Steel’s Nagoya Works, Sumitomo’s Kashima Works, and Kawasaki Steel’s Mizushima Iron and Steel Works have tested dedicated converters for dephosphorization. Shougang Jingtang Company, which was put into operation in 2009, is the first steel plant in China to research and develop the new "three-off" pretreatment process of converter molten iron, and it is also the first domestic new-type steel plant designed and constructed according to the dual process. [0003] The blowing time of the dephosphorization converter is short, only 5...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/32
CPCC21C5/32
Inventor 闫占辉张丙龙张新国白艳江裴培郭小龙
Owner SHOUGANG JINGTANG IRON & STEEL CO LTD
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