A method for simultaneously dephosphorizing and extracting vanadium in a vanadium-containing molten iron converter

A converter and molten iron technology, applied in the manufacture of converters and other directions, can solve problems such as converter lining erosion, and achieve the effect of reducing steel material consumption, reducing dephosphorization tasks, and achieving excellent quality.

Active Publication Date: 2017-12-12
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problem of conventional dephosphorization and vanadium extracting agents eroding the converter lining, and at the same time carry out partial removal of phosphorus in molten iron and extraction of vanadium, and reduce the TFe content of vanadium slag, thereby reducing the consumption of iron and steel materials and providing for steelmaking Converter provides low phosphorous semi-steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] After the 200t vanadium-extracting converter has mixed iron, the oxygen-reducing lance is used for blowing, and the oxygen flow rate is controlled at 20,000Nm throughout the process 3 / min, the intensity of nitrogen blowing at the bottom is 0.3Nm 3 / t·min control; blowing 1 ~ 2min gun position is controlled by 1.9m, at the same time add steel slag 10kg / tFe for control, then add iron oxide scale and lime, the amount of iron oxide scale is controlled by 25kg / tFe, add lime to reduce the slag The binary alkalinity is controlled at about 1.5; the position of the oxygen lance is controlled to 2.2m 2 minutes before the end of blowing; after the end of blowing, semi-steel and vanadium slag are produced.

[0024] The vanadium content in molten iron is 0.330%, and the phosphorus content is 0.070%. After blowing, the semi-steel has a vanadium content of 0.062%, a phosphorus content of 0.041%, a semi-steel temperature of 1380°C, and a vanadium slag TFe of 16.32%.

Embodiment 2

[0026] After the 120t vanadium-extracting converter has mixed iron, the oxygen-reducing lance is used for blowing, and the oxygen flow rate is controlled at 35,000Nm throughout the process 3 / min, the intensity of nitrogen blowing at the bottom is 0.1Nm 3 / t·min control; blowing 1 ~ 2min gun position is controlled by 2.0m, steel slag 5kg / tFe is added at the same time, then iron oxide scale and lime are added, the amount of iron oxide scale is controlled by 20kg / tFe, lime is added to dibasic slag The temperature is controlled at about 1.8; the position of the oxygen lance is controlled to 2.1m 2 minutes before the end of blowing; semi-steel and vanadium slag are produced after blowing.

[0027] The vanadium content in molten iron is 0.302%, and the phosphorus content is 0.081%. After blowing, the semi-steel has a vanadium content of 0.046%, a phosphorus content of 0.042%, a semi-steel temperature of 1395°C, and a vanadium slag TFe of 13.59%.

Embodiment 3

[0029] After the 200t vanadium extracting converter has mixed iron, the oxygen-reducing lance is used for blowing, and the oxygen flow rate is controlled at 23000Nm throughout the process 3 / min, the intensity of nitrogen blowing at the bottom is 0.2Nm 3 / t·min control; blowing 1 ~ 2min gun position is controlled by 1.9m, and steel slag is added at the same time, the amount of steel slag is controlled by 8kg / tFe, then oxide scale and lime are added, and the amount of oxide scale is controlled by 15kg / tFe, Add lime to control the binary alkalinity of the slag at about 1.7; control the position of the oxygen lance to 2.1m 2 minutes before the end of the blowing; after the end of the blowing, semi-steel and vanadium slag are produced.

[0030] 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 phosphorus content of 0.039%, a semi-steel temperature of 1392°C, and a vanadium slag TFe...

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Abstract

The invention belongs to the field of iron and steel smelting and particularly relates to a method for simultaneously conducting dephosphorization and vanadium extraction on vanadium-contained molten iron through a converter. The method aims to solve the problem that a furnace lining of a converter is corroded by a conventional dephosphorization and vanadium extraction agent, part of phosphorus in the molten iron is removed while vanadium extraction is conducted, and the content of TFe in vanadium slag is reduced, so that the steel material consumption is reduced, and low-phosphorus semisteel is provided for a steel converter. The method for simultaneously conducting dephosphorization and vanadium extraction on the vanadium-contained molten iron through the converter comprises the following steps that A, after the molten iron is poured into the vanadium extraction converter, blowing is conducted through a deoxygenation lance, the oxygen flow is controlled to be 20000-35000 Nm<3> / min in the whole process, and the nitrogen bottom blowing intensity is 0.1-0.3 Nm<3> / t.min; B, after nitrogen bottom blowing is conducted for 1-2 min, the lance position is controlled according to 1.9-2.0 m, and meanwhile steel slag, ferric oxide and lime are added in sequence for slagging; C, the lance position of the deoxygenation lance is controlled to 2.0-2.2 m two minutes before blowing is finished; and D, the semisteel and the vanadium slag are discharged after blowing is finished.

Description

technical field [0001] The invention belongs to the field of iron and steel smelting, and in particular relates to a method for simultaneously dephosphorizing and extracting vanadium in a vanadium-containing molten iron converter. Background technique [0002] 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 1980's, 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 in industry. Dephosphorization of ladles or torpedo tanks mainly has problems such as large temperature drop, severe splashing dur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/36C21C5/34
CPCC21C5/34C21C5/36
Inventor 陈炼谢兵戈文荪曾建华王建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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