A kind of production method of low-phosphorus semi-steel

A production method and semi-steel production technology, which is applied in the manufacture of converters, etc., can solve the problems of large corrosion of the furnace lining, affect the life of the converter, and the ineffective dephosphorization effect, so as to reduce the consumption of steel materials and reduce the dephosphorization task.

Active Publication Date: 2018-09-04
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 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; at the beginning of blowing, add 10kg / tFe of final slag from steelmaking converter to extract vanadium to make slag; 2 minutes before blowing, the gun position is controlled by 30mm above the reference gun position; after blowing 2min, add iron oxide scale, the amount of oxide scale Control according to 25kg / tFe, and lower the lance position to the reference lance position at the same time; control the oxygen lance lance position to 40mm above the reference lance position 2 minutes before the end of blowing; after the end of blowing, semi-steel and vanadium slag are produced.

[0024] The vanadium content in molt...

Embodiment 2

[0027] 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; when blowing starts, add 5kg / tFe of vanadium extraction final slag from steelmaking converter to make slag, 2 minutes before blowing, the gun position is controlled by 20mm above the reference gun position; after blowing 2min, add iron oxide scale, the amount of iron oxide scale The amount is controlled according to 20kg / tFe, and at the same time, it is controlled according to the reference lance position; the oxygen lance position is controlled to be 50mm above the reference lance position 2 minutes before the end of blowing; semi-steel and vanadium slag are discharged after blowing.

[0028] The vanadium conten...

Embodiment 3

[0031] 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; when blowing starts, add 8kg / tFe of final slag from steelmaking converter to extract vanadium, 2 minutes before blowing, the gun position is controlled by 10mm above the reference gun position; after blowing 1.5min, add iron oxide scale, the amount of iron oxide scale Control according to 15kg / tFe; control according to the reference lance position after 2 minutes of blowing; control the oxygen lance lance position to 30mm above the reference lance position 2 minutes before the end of blowing; produce semi-steel and vanadium slag after blowing.

[0032] The vanadium content in molten iron is 0.386%, and the phosphor...

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Abstract

The invention belongs to the field of steel and iron smelting, in particular, relates to a production method of low-phosphorus semisteel, aims to solve the problem of lower dephosphorization rate in molten iron vanadium extraction by a conventional method, reduces the TFe content in vanadium slag, and reduces the steel and iron consumption to provide the low-phosphorus semisteel to a steel making converter. The production method of the low-phosphorus semisteel comprises the following steps: (A) after a vanadium extracting converter mixes iron, 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) steel making converter final slag is added at the beginning of blowing; the gun position is controlled according to a reference gun position by above 10-30 mm before blowing by 2 min; oxide iron sheets or other high-iron-content oxides are added after blowing by 1-2 min; the control is performed according to the reference gun position after blowing by 2 min; and the gun position is controlled according to a reference gun position by above 30-50 mm before blowing by 2 min; and (C) the semisteel and the vanadium steel are discharged after blowing.

Description

technical field [0001] The invention belongs to the field of iron and steel smelting, and in particular relates to a production method of low-phosphorus semi-steel. 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 to compensate for temperature drop, and long pro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/30C21C5/36C21C7/064C21C7/00
CPCC21C5/30C21C5/36C21C7/00C21C7/064C21C2007/0093
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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