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Method for synchronously dephosphorization and vanadium extraction of vanadium-containing molten iron

A technology of molten iron and iron oxide scale, applied in the direction of manufacturing converters, etc., can solve serious problems such as corrosion of furnace lining, and achieve the effect of reducing TFe content, reducing steel material consumption, and avoiding corrosion

Inactive Publication Date: 2013-07-10
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the above two methods have the disadvantage that the lining is corroded more seriously.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0022] After the 200t vanadium extracting converter has mixed iron, the temperature of the vanadium-containing molten iron is 1310°C, and 15t pig iron blocks are added to cool down; after the pig iron blocks are added, the oxygen-reducing lance is blown, and the oxygen flow rate is controlled at 25000Nm throughout the process 3 / min; 1-2 minutes before blowing, the gun position is controlled by 1.8m, and iron oxide scale and lime are added at the same time. The amount of iron oxide scale is controlled by 20kg / tFe, and the amount of lime added is 10kg / tFe; m control, and at the same time add the second batch of iron oxide scales to control the temperature within 3 minutes of blowing oxygen, and the amount of iron oxide scales is controlled by 18kg / tFe; The height is reduced to 1.7m; semi-steel and vanadium slag are produced after blowing. In this example, the total blowing time for oxygen lance blowing is 5.5 minutes.

[0023] The vanadium content in molten iron is 0.330%, and...

example 2

[0025] After the 120t vanadium-extracting converter has mixed iron, the temperature of the vanadium-containing molten iron is 1280°C, and 2t of pig iron blocks are added to cool down; after the pig iron blocks are added, the oxygen-reducing lance is blown, and the oxygen flow rate is controlled at 17000Nm throughout the process 3 / min; 1-2 minutes before blowing, the gun position is controlled by 1.6m, and iron oxide scale and lime are added at the same time. The amount of iron oxide scale is controlled by 10kg / tFe, and the amount of lime added is 8kg / tFe; m control, and at the same time add the second batch of iron oxide scales to control the temperature within 3 minutes of blowing oxygen, and the amount of iron oxide scales is controlled by 17kg / tFe; The gun position is lowered to 1.7m; semi-steel and vanadium slag are produced after blowing. In this example, the total blowing time for oxygen lance blowing is 6.0 minutes.

[0026]The vanadium content in molten iron is 0.302...

example 3

[0028] After the 200t vanadium-extracting converter has mixed iron, the temperature of the vanadium-containing molten iron is measured at 1250°C. After the temperature measurement is completed, the oxygen-reducing lance is used for blowing, and the oxygen flow rate is controlled at 23000Nm throughout the process. 3 / min; 1-2 minutes before blowing, the gun position is controlled at 1.7m, and iron oxide scale and lime are added at the same time. m control, and at the same time add the second batch of iron oxide scales to control the temperature within 3 minutes of blowing oxygen, and the amount of iron oxide scales is controlled by 18kg / tFe; The gun position is lowered to 1.6m; semi-steel and vanadium slag are produced after blowing. In this example, the total blowing time for oxygen lance blowing is 6.5 minutes.

[0029] The vanadium content in molten iron is 0.336%, and the phosphorus content is 0.061%. After blowing, the semi-steel has a vanadium content of 0.046%, a phosph...

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Abstract

The invention discloses a method for synchronously dephosphorization and vanadium extraction of vanadium-containing molten iron. The method comprises the following steps of: controlling temperature of vanadium-containing molten iron at 1230-1250 DEG C; carrying out oxygen-injection blowing, wherein oxygen flow is constantly controlled at 17000-25000Nm<3> / h, and the blowing process sequentially comprises three stages; the first stage starts from blowing to 1-2min of blowing, gun position is 1.6-1.8m, and lime for controlling alkalinity of slag to be 2-4 lime and 15-20kg / tFe of iron scale are added simultaneously; the second stage starts after 1-2min of blowing, gun position is 1.8-2.1m, and 5-18kg / tFe of iron scale is added in the process that oxygen-injection time is not greater than 3min; and the third stage starts from blowing to 2min of the end, 0.5-2kg / tFe of high-magnesium lime is added, and gun position is reduced to 1.6-1.8m; and blowing to end, and discharging semi-steel and vanadium slag. The method disclosed by the invention has the advantages that corrosion to lining of a vanadium extraction converter is effectively avoided, and dephosphorization and vanadium extraction are synchronously implemented; and TFe content in the vanadium slag is reduced.

Description

technical field [0001] The invention belongs to the technical field of smelting vanadium-containing molten iron, and specifically relates to a method for simultaneously dephosphorizing and extracting vanadium-containing molten iron by using a vanadium-extracting converter. Background technique [0002] In general, phosphorus is a harmful element in most steel grades. In recent years, with the rapid development of science and technology, low-temperature steel, marine steel, hydrogen-induced cracking-resistant steel and steel for some thick plates must not only have extremely low sulfur content, but also require the phosphorus content in steel to be less than 0.01% or 0.005%. Since the 1980s, various treatment methods have been developed for the pre-dephosphorization of molten iron. The dephosphorization pretreatment of molten iron is carried out in the converter, and both methods have been applied industrially. Dephosphorization of ladles or torpedo tanks mainly has proble...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/34
Inventor 陈炼陈永戈文荪王建曾建华蒋龙奎卓钧王二军黄正华董克平
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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