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

A converter and molten iron technology, which is used in the manufacture of converters and other directions, can solve the problems of large furnace lining erosion, insignificant dephosphorization effect, and impact on the life of the converter, and achieve the effect of reducing TFe content, reducing dephosphorization tasks, and reducing steel material consumption.

Active Publication Date: 2018-08-14
CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As can be seen from the above-mentioned patents, both methods use sodium compounds as dephosphorization agents. Although this can achieve a certain dephosphorization effect, the dephosphorization effect is not obvious, and the addition of sodium compounds to the converter is less erosive to the furnace lining. Large, affecting the life of the converter

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 temperature of the molten iron is measured at 1310°C. After the temperature measurement is completed, the oxygen-reducing lance is used for blowing, and the oxygen flow rate is controlled at 1.5Nm throughout the process. 3 / t.min, the intensity of bottom blowing nitrogen is 0.3Nm 3 / t.min control; add lime at the beginning of blowing, and the amount of lime added will control the binary alkalinity of slag at about 1.4. The amount of iron sheet is controlled according to 25kg / tFe, and at the same time, the oxygen lance is lowered to the reference lance position; the oxygen lance position is controlled to 50mm above the reference lance position 2 minutes before the end of blowing; semi-steel and vanadium slag are discharged after blowing; steel is tapped Add lime 2kg / t steel, iron oxide scale 1.5kg / t steel, converter final slag 1kg / t steel at 1 / 4 for mixed flushing dephosphorization.

[0024] The vanadium c...

Embodiment 2

[0026] After the 120t vanadium extracting converter has mixed iron, the temperature of the molten iron is measured at 1280°C. After the temperature measurement is completed, the oxygen-reducing lance is used for blowing, and the oxygen flow rate is controlled at 3.0Nm throughout the process. 3 / t.min, the intensity of bottom blowing nitrogen is 0.2Nm 3 / t.min control; add lime at the beginning of blowing, and the amount of lime added will control the binary alkalinity of slag at about 1.7, and the gun position 2 minutes before blowing should be controlled by 10mm above the reference gun position; 2 minutes after blowing, add iron oxide scale to oxidize The amount of iron sheet is controlled according to 20kg / tFe, and at the same time, the oxygen lance is lowered to the reference lance position; the oxygen lance position is controlled to 30mm above the reference lance position 2 minutes before the end of blowing; semi-steel and vanadium slag are discharged after blowing; steel i...

Embodiment 3

[0029] After the 200t vanadium extracting converter has mixed iron, the temperature of the 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 2Nm throughout the process. 3 / t.min, the intensity of bottom blowing nitrogen is 0.4Nm 3 / t.min control; add lime at the beginning of blowing, and the amount of lime added will control the binary alkalinity of slag at about 1.5. The amount of iron sheet is controlled according to 15kg / tFe, and at the same time, the oxygen lance is lowered to the reference lance position; the oxygen lance position is controlled to 40mm above the reference lance position 2 minutes before the end of blowing; semi-steel and vanadium slag are discharged after blowing; steel is tapped Add lime 1.5kg / t steel, oxide scale 1.4kg / t steel, converter final slag 1kg / t steel at 1 / 4 for mixed flushing dephosphorization.

[0030] The vanadium conten...

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Abstract

The invention belongs to the steel smelting field, and particularly relates to a method for dephosphorizing vanadium-containing molten iron in a vanadium extraction converter. The method aims to solve the problem that vanadium-extraction and dephosphorization efficiency is relatively low in the conventional method, and reduce TFe content in vanadium slag, so that steel material consumption is reduced, and low-phosphor semisteel is provided for a steel-making converter. The method for dephosphorizing vanadium-containing molten iron in the vanadium extraction converter comprises the following steps of: A, after iron is completely converted in the vanadium extraction converter, a deoxygenation lance is used for blowing, wherein oxygen gas flow is controlled to be 1.5-3.0Nm<3> / t.min throughout the whole process, and bottom-blowing nitrogen strength is 0.2-0.4 Nm<3> / t.min; B, lime is added when blowing starts, a lance position is controlled 10-30mm above a standard lance position 2 minutes before blowing; iron oxide scale or other oxides with high iron content are added 1-2 minutes after blowing; the lance position is controlled according to the standard lance position 2 minutes after blowing; and the lance position is controlled 30-50mm above the standard lance position 2 minutes before blowing is ended; and C, discharging semisteel and vanadium slag after blowing is ended.

Description

technical field [0001] The invention belongs to the field of iron and steel smelting, and in particular relates to a method for dephosphorizing vanadium-containing molten iron in a vanadium extraction 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 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 in industry. Dephosphorization of ladles or torpedo tanks mainly has problems such as large temperature drop, severe splashing during oxygen blowing t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/28C21C5/36
CPCC21C5/28C21C5/36
Inventor 陈炼谢兵戈文荪曾建华王建卓钧王二军付新瑞黄正华黄东平
Owner CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
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