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A kind of method for producing low phosphorus semi-steel by vanadium-containing molten iron converter

A molten iron and converter technology, applied in the direction of manufacturing converters, etc., can solve the problems of large furnace lining erosion, affecting the life of the converter, and the dephosphorization effect is not obvious. stable effect

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

[0025] After the first heat of the 200t vanadium extraction converter has been mixed with iron, the temperature of the molten iron is measured at 1305°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, the amount of lime added to control the binary alkalinity of the slag at about 2.0, the gun position 2 minutes before blowing is controlled by 10 mm above the reference gun position; add iron oxide scale after blowing 2 minutes, and Lower the lance position to the reference lance position, and control the amount of oxide scale at 25kg / tFe; 2 minutes before the end of blowing, the oxygen lance position is controlled to be 50mm above the reference lance position; semi-steel and 50% vanadium slag are produced after blowing. The slag basicity of the se...

Embodiment 2

[0029] 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; lime is added at the beginning of blowing, and the amount of lime added to control the binary alkalinity of the slag at about 1.8, the gun position 2 minutes before blowing is controlled by 20mm above the reference gun position; iron oxide scale is added after blowing 1.5min; After 2 minutes of blowing, lower the lance position to the reference lance position, and the amount of oxide scale is controlled at 20kg / tFe; 2 minutes before the end of blowing, the oxygen lance position is controlled to be 40mm above the reference lance position; after blowing, semi-steel and 50 % Vanadium slag. The slag basicity of the ...

Embodiment 3

[0033] 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; lime is added at the beginning of blowing, and the amount of lime added to control the binary alkalinity of slag at about 1.9, the gun position 2 minutes before blowing is controlled by 30 mm above the reference gun position; iron oxide scale is added after blowing 2 minutes, and Lower the lance position to the reference lance position, and control the amount of oxide scale at 15kg / tFe; 2 minutes before the end of blowing, the oxygen lance position is controlled to be 30mm above the reference lance position; after blowing, semi-steel and 50% vanadium slag are produced. The slag basicity of the second furnace is cont...

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Abstract

The invention belongs to the field of steel and iron smelting, and in particular, relates to a method for producing low-phosphorus semisteel by a vanadium-contained molten iron converter. The method for producing the low-phosphorus semisteel by the vanadium-contained molten iron converter comprises the following steps: (A) after iron is mixed by a vanadium extracting converter, an oxygen reducing gun performs blowing; the oxygen flow is controlled within 1.5-3.0 Nm3 / t.min in the whole process; and the bottom blowing nitrogen strength is 0.2-0.4 Nm3 / t.min; (B) a gun position is controlled by above 10-30 mm according to a reference gun position before blowing by 2 min; steel making converter final slag is added at the beginning of blowing; iron-contained oxides are added after blowing by 1-2 min; the reference gun position is reduced to during blowing by 2-5 min; and the gun position is controlled by above 30-50 mm according to the reference gun position before blowing by 2 min; and (C) the semisteel and 50% of vanadium slag are discharged after blowing; in a second furnace, the oxygen supply system is the same with the first furnace; the basicity of the slag is controlled within 1.5-1.8 by the added lime quantity; the semisteel and 50% of vanadium slag are discharged after blowing; and the subsequent furnace operation is the same with the second furnace.

Description

technical field [0001] The invention belongs to the field of iron and steel smelting, and in particular relates to a method for producing low-phosphorus semi-steel by 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 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): C21C5/30C21C5/36C21C7/064
CPCC21C5/30C21C5/36C21C7/064
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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