A method for synchronous oxidation and separation of phosphorus and vanadium in vanadium-containing molten iron in a converter

A technology for separating phosphorus, vanadium, and converters, which is applied in the manufacture of converters, etc., can solve the problems of affecting the life of converters, the dephosphorization effect is not obvious, and the lining is eroded, so as to reduce the dephosphorization task and facilitate dephosphorization and vanadium extraction. Effect of reducing TFe content

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

[0020] 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 to control the binary alkalinity of the slag at about 1.4; 2 minutes before blowing, the gun position should be 10mm above the reference gun position; 25kg / tFe is controlled, and the oxygen lance is lowered to the reference lance position at the same time; 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.

[0021] 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 ...

Embodiment 2

[0023] 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 to control the binary alkalinity of the slag at about 1.7; 2 minutes before blowing, the gun position should be 20mm above the reference gun position; 20kg / tFe is controlled, and the oxygen lance is lowered to the reference lance position at the same time; 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.

[0024] 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 ...

Embodiment 3

[0026] 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 to control the binary alkalinity of the slag at about 1.7 at the same time of blowing; 2 minutes before blowing, the gun position should be 30mm above the reference gun position; 15kg / tFe is controlled, and the oxygen lance is lowered to the reference lance position at the same time; 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.

[0027] The vanadium content in molten iron is 0.386%, and the phosphorus content is 0.061%. After blowing, the semi-steel has a vanadium content of...

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Abstract

The invention belongs to the field of steel smelting and particularly relates to a method of separating phosphorus and vanadium by simultaneous oxidation of vanadium-bearing molten iron in a converter. The method provided by the invention aims to solve the problem that the efficiency of vanadium extraction and phosphorus removal for molten iron by a conventional method is relatively low, and reduces the content TFe in vanadium slag, so that the consumption of an iron and steel material is reduce and low-phosphorous semi-steel is provided for the steel-making converter. The method of separating phosphorus and vanadium by simultaneous oxidation of vanadium-bearing molten iron in the converter provided by the invention comprises the steps of: A, after iron is blended in the vanadium-extracting converter, descending an oxygen lance to blow, wherein the oxygen flow in the full course is controlled at 1.5-3.0Nm3 / t.min, and the intensity of bottom blowing nitrogen is 0.2-0.4N3 / t.min; B, adding lime after blowing is started, and controlling the lance position 10-30mm over a standard lance position 2min before blowing; after blowing in 1-2min, adding iron oxide scales or other high iron-bearing oxides; controlling the lance position according to the standard lance position 2min after blowing; and controlling the lance position 30-50mm over the standard lance position 2min before blowing is finished; and C, after blowing is finished, discharging semi-steel and vanadium slag.

Description

technical field [0001] The invention belongs to the field of iron and steel smelting, and in particular relates to a method for synchronously oxidizing and separating phosphorus and vanadium in vanadium-containing molten iron in a 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 spl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/30C21C5/36C21C7/064C22B34/22
CPCC21C5/30C21C5/36C21C7/064C22B34/22
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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