CN112575138A - Method for extracting vanadium by converter - Google Patents

Method for extracting vanadium by converter Download PDF

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Publication number
CN112575138A
CN112575138A CN202011380738.7A CN202011380738A CN112575138A CN 112575138 A CN112575138 A CN 112575138A CN 202011380738 A CN202011380738 A CN 202011380738A CN 112575138 A CN112575138 A CN 112575138A
Authority
CN
China
Prior art keywords
converter
vanadium
blowing
extracting vanadium
iron
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202011380738.7A
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Chinese (zh)
Inventor
李龙
王建
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pangang Group Panzhihua Iron and Steel Research Institute Co Ltd
Original Assignee
Pangang Group Panzhihua Iron and Steel Research Institute Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Pangang Group Panzhihua Iron and Steel Research Institute Co Ltd filed Critical Pangang Group Panzhihua Iron and Steel Research Institute Co Ltd
Priority to CN202011380738.7A priority Critical patent/CN112575138A/en
Publication of CN112575138A publication Critical patent/CN112575138A/en
Pending legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/30—Regulating or controlling the blowing
    • C21C5/35—Blowing from above and through the bath
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/072—Treatment with gases
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B34/00—Obtaining refractory metals
    • C22B34/20—Obtaining niobium, tantalum or vanadium
    • C22B34/22—Obtaining vanadium
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Abstract

The invention belongs to the technical field of vanadium metallurgy, and particularly relates to a method for extracting vanadium by a converter. The invention aims to solve the technical problem of providing a method for extracting vanadium by a converter, and reducing the content of residual vanadium. The method for extracting vanadium by the converter comprises the following steps: adding vanadium-containing molten iron into a converter, and blowing CO at the bottom of the converter after the converter is shaken2Simultaneously adopting oxygen lance to top-blow O2Adding a coolant within 2min of blowing, and blowing bottom CO for 3-4 min2Switch to N2And blowing to the end point. The method recycles carbon dioxide gas discharged by steel production, is used for extracting vanadium in the converter, and can achieve the effects of energy conservation and emission reduction; at the same time, the invention adopts CO2Substituted part O2Or N2Go on to changeThe furnace vanadium extraction can play a role in inhibiting the temperature rise of a molten pool, is beneficial to vanadium extraction and carbon preservation, and can also effectively reduce the content of residual vanadium.

Description

Method for extracting vanadium by converter
Technical Field
The invention belongs to the technical field of vanadium metallurgy, and particularly relates to a method for extracting vanadium by a converter.
Background
In the process of extracting vanadium by a converter, O2The vanadium-titanium mixed smelting furnace is oxidized with silicon, manganese, vanadium, titanium and partial carbon elements to generate a large amount of heat, so that the temperature of a melting pool is quickly increased to be more than 1400 ℃, and exceeds the transition temperature of C-V oxidation of the melting pool, thereby deteriorating the thermodynamic conditions of vanadium extraction and carbon preservation. Therefore, the temperature is controlled by adding massive coolants such as pig iron blocks, iron ores, iron scales, scrap steel and the like in the production process, and the method obtainsCertain effect is achieved.
However, these lump coolants cannot control the temperature of the molten pool continuously, and simultaneously, the local part of the molten pool is easy to have a rapid cooling phenomenon, and the converter vanadium extraction process has a fast rhythm, the smelting dynamic conditions of the lump coolants are insufficient, the smelting is incomplete, the cooling effect cannot be effectively exerted, and the converter vanadium extraction is not beneficial.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for extracting vanadium by a converter, and reducing the content of residual vanadium.
The invention provides a method for extracting vanadium by a converter to solve the technical problems, which comprises the following steps: adding vanadium-containing molten iron into a converter, and blowing CO at the bottom of the converter after the converter is shaken2Simultaneously adopting oxygen lance to top-blow O2Adding a coolant within 2min of blowing, and blowing bottom CO for 3-4 min2Switch to N2And blowing to the end point.
In the method for extracting vanadium by using the converter, the temperature of the vanadium-containing molten iron is 1260-1320 ℃, and the vanadium-containing molten iron contains V: 0.28 to 0.34 percent.
Wherein, in the method for extracting vanadium by the converter, the CO is2Is obtained by recycling the discharged steel after production.
Wherein, in the method for extracting vanadium by the converter, after the converter is shaken, the converter blows CO from the bottom2The strength of (A) is 0.1 to 0.15Nm3Iron,/min. t.
Wherein, in the method for extracting vanadium by the converter, the oxygen lance is used for top blowing O2The strength of (A) is 1.5 to 2.5Nm3The/min. t iron, the gun position is controlled to be 1.7-2.0 m.
In the method for extracting vanadium by using the converter, the coolant is at least one of pellet, pig iron blocks or cold pressing blocks for the converter; the amount of the coolant is 20-27 kg/t iron.
Wherein, in the method for extracting vanadium by the converter, bottom blowing CO2Switch to N2The strength of (A) is 0.09-0.12 Nm3Iron,/min. t.
Wherein, in the method for extracting vanadium by the converter, an oxygen lance is adopted to blow O25-6 min to the end point。
In the method for extracting vanadium by the converter, the temperature of the semisteel is controlled to be 1360-1400 ℃ when the blowing reaches the end point.
The invention has the beneficial effects that:
the method recycles carbon dioxide gas discharged by steel production, is used for extracting vanadium in the converter, and can achieve the effects of energy conservation and emission reduction. The method of the invention adopts CO2The chemical heat generated by the reaction with vanadium-containing molten iron is less than O2Chemical heat generated by reaction with vanadium-containing molten iron due to CO2Has a physical heat absorption of N21.6 times of that of the catalyst, the invention adopts CO2Substituted part O2Or N2The vanadium extraction in the converter can inhibit the temperature rise of the molten pool and is beneficial to vanadium extraction and carbon protection. The method can also effectively reduce the content of residual vanadium.
Detailed Description
Specifically, the invention provides a method for extracting vanadium by a converter, which comprises the following steps:
adding vanadium-containing molten iron with the V content of 0.28-0.34% into a converter, and after the converter is shaken, blowing CO at the bottom of the converter2Bottom blowing of CO2The strength is 0.1 to 0.15Nm3The iron is subjected to the top blowing of an oxygen lance at the same time2Oxygen supply intensity of the oxygen lance is 1.5-2.5 Nm3Controlling the gun position to be 1.7-2.0 m, adding 20-27 kg/t iron coolant within 2min of blow-on, and blowing CO at the bottom for 3-4 min2Switch to N2Bottom blowing of N2The strength is 0.09-0.12 Nm3And (4) blowing oxygen for 5-6 min to the end point by using an oxygen lance in the whole process.
On one hand, the invention recovers the carbon dioxide gas discharged by steel production, is used for vanadium extraction in a converter, and can achieve the effects of energy conservation and emission reduction. On the other hand using CO2The chemical heat generated by the reaction with vanadium-containing molten iron is less than O2Chemical heat generated by reaction with vanadium-containing molten iron by adopting CO2Substituted part O2Or N2The vanadium extraction in the converter can inhibit the temperature rise of the molten pool and is beneficial to vanadium extraction and carbon protection. Meanwhile, the method can also effectively reduce the content of residual vanadium.
The present invention will be further illustrated by the following specific examples.
Example 1
Adding vanadium-containing molten iron with the V content of 0.28-0.34% into a converter, controlling the temperature of the molten iron to be 1260-1320 ℃, shaking the converter, and then blowing CO at the bottom2Strength of 0.1Nm3The iron is subjected to the top blowing of an oxygen lance at the same time2Oxygen supply intensity of the oxygen lance is 1.5-2.5 Nm3Controlling the gun position to be 1.7-2.0 m, adding 20-27 kg/t iron coolant within 2min of blow-on, and blowing CO at the bottom for 3min of blow-on2Switch to N2Bottom blowing of N2The strength is 0.09-0.12 Nm3And (4) blowing oxygen for 5min to the end point by using an oxygen lance in the whole process, and controlling the end point temperature of the semisteel to be 1360-1400 ℃. The average C content of the obtained semisteel is 3.43 percent, and the average V content is 0.036 percent.
Example 2
Adding vanadium-containing molten iron with the V content of 0.28-0.34% into a converter, controlling the temperature of the molten iron to be 1260-1320 ℃, shaking the converter, and then blowing CO at the bottom2Strength of 0.15Nm3The iron is subjected to the top blowing of an oxygen lance at the same time2Oxygen supply intensity of the oxygen lance is 1.5-2.5 Nm3Controlling the gun position to be 1.7-2.0 m, adding 20-27 kg/t iron coolant within 2min of blow-on, and blowing CO at the bottom for 4min of blow-on2Switch to N2Bottom blowing of N2The strength is 0.09-0.12 Nm3And (4) blowing oxygen for 6min to the end point by using an oxygen lance in the whole process, and controlling the end point temperature of the semisteel to be 1360-1400 ℃. The average content of C in the semisteel is 3.42 percent, and the average content of V is 0.035 percent.
Comparative example
Adding molten iron with the V content of 0.28-0.34% into a converter, controlling the temperature of the molten iron to be 1260-1320 ℃, shaking the converter and then blowing N from the bottom2，N2The blowing intensity was 0.1Nm3The oxygen supply intensity of the oxygen lance is 1.5-2.5 Nm3Controlling the lance position to be 1.7-2.0 m/min. t iron, adding a coolant within 2min of oxygen blowing of the oxygen lance, consuming 20-27 kg/t iron by the coolant, controlling the oxygen blowing time to be 5-6 min, and controlling the semi-steel end point temperature to be 1360-1400 ℃. The average content of C in the semisteel is 3.44 percent and the average content of residual vanadium is0.039％。

Claims (8)

1. The method for extracting vanadium by the converter is characterized by comprising the following steps: the method comprises the following steps: adding vanadium-containing molten iron into a converter, and blowing CO at the bottom of the converter after the converter is shaken2Simultaneously adopting oxygen lance to top-blow O2Adding a coolant within 2min of blowing, and blowing bottom CO for 3-4 min2Switch to N2And blowing to the end point.
2. The method for extracting vanadium by using the converter according to claim 1, characterized by comprising the following steps: the temperature of the vanadium-containing molten iron is 1260-1320 ℃.
3. The method for extracting vanadium by a converter according to claim 1 or 2, characterized in that: the bottom blowing CO of the converter after the swinging2The strength of (A) is 0.1 to 0.15Nm3Iron,/min. t.
4. The method for extracting vanadium by using the converter according to any one of claims 1 to 3, characterized by comprising the following steps: the oxygen lance is top blown with O2The strength of (A) is 1.5 to 2.5Nm3The/min. t iron, the gun position is controlled to be 1.7-2.0 m.
5. The method for extracting vanadium by using the converter according to any one of claims 1 to 4, wherein the method comprises the following steps: the coolant is selected from at least one of pellet ore, pig iron blocks or cold pressing blocks for a converter; the amount of the coolant is 20-27 kg/t iron.
6. The method for extracting vanadium by using the converter according to any one of claims 1 to 5, wherein: bottom blowing CO2Switch to N2The strength of (A) is 0.09-0.12 Nm3Iron,/min. t.
7. The method for extracting vanadium by using the converter according to any one of claims 1 to 6, characterized by comprising the following steps: blowing oxygen by oxygen lance25-6 min to the end point.
8. The method for extracting vanadium by using the converter according to any one of claims 1 to 7, characterized by comprising the following steps: and when the blowing is finished, controlling the temperature of the semisteel to be 1360-1400 ℃.
CN202011380738.7A 2020-11-30 2020-11-30 Method for extracting vanadium by converter Pending CN112575138A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011380738.7A CN112575138A (en) 2020-11-30 2020-11-30 Method for extracting vanadium by converter

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Application Number Priority Date Filing Date Title
CN202011380738.7A CN112575138A (en) 2020-11-30 2020-11-30 Method for extracting vanadium by converter

Publications (1)

Publication Number Publication Date
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4334921A (en) * 1979-04-16 1982-06-15 Nippon Steel Corporation Converter steelmaking process
CN101736116A (en) * 2010-02-01 2010-06-16 中冶赛迪工程技术股份有限公司 Temperature reduction technology for steel converter coal gas flue
CN103966391A (en) * 2014-05-05 2014-08-06 攀钢集团攀枝花钢铁研究院有限公司 Method for extracting vanadium through top-bottom combined blowing converter
CN103966390A (en) * 2014-05-05 2014-08-06 攀钢集团攀枝花钢铁研究院有限公司 Method for extracting vanadium through top-bottom combined blowing converter
CN110257583A (en) * 2019-07-10 2019-09-20 攀钢集团攀枝花钢铁研究院有限公司 The method for reducing TFe content in converter extracting vanadium finishing slag

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4334921A (en) * 1979-04-16 1982-06-15 Nippon Steel Corporation Converter steelmaking process
CN101736116A (en) * 2010-02-01 2010-06-16 中冶赛迪工程技术股份有限公司 Temperature reduction technology for steel converter coal gas flue
CN103966391A (en) * 2014-05-05 2014-08-06 攀钢集团攀枝花钢铁研究院有限公司 Method for extracting vanadium through top-bottom combined blowing converter
CN103966390A (en) * 2014-05-05 2014-08-06 攀钢集团攀枝花钢铁研究院有限公司 Method for extracting vanadium through top-bottom combined blowing converter
CN110257583A (en) * 2019-07-10 2019-09-20 攀钢集团攀枝花钢铁研究院有限公司 The method for reducing TFe content in converter extracting vanadium finishing slag

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Application publication date: 20210330