CN115074481A - Method for improving chemical heat of vanadium extraction semisteel - Google Patents
Method for improving chemical heat of vanadium extraction semisteel Download PDFInfo
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- CN115074481A CN115074481A CN202210806200.0A CN202210806200A CN115074481A CN 115074481 A CN115074481 A CN 115074481A CN 202210806200 A CN202210806200 A CN 202210806200A CN 115074481 A CN115074481 A CN 115074481A
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- CN
- China
- Prior art keywords
- blowing
- vanadium
- semisteel
- vanadium extraction
- chemical heat
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- 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
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- 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
- C21C7/0006—Adding metallic additives
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- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention belongs to the technical field of steel smelting, and particularly relates to a method for improving chemical heat of vanadium extraction semisteel. The method comprises the following steps: after the molten iron is added into the converter, an oxygen lance is used for carrying out O 2 With CO 2 Blowing the mixed gas, wherein a high lance position is adopted 0.5-1.0 min in the early stage of blowing, a low lance position is adopted in the middle stage of blowing, and a low lance position is adopted 1-1.5 min before blowing is finished; bottom blowing N in non-converting stage 2 Bottom blowing CO during converting; adding a vanadium extracting coolant 2.5min before blowing, and adding manganese ore 3min before blowing. The invention can reduce the consumption of the coolant, improve the oxidation rate of vanadium, improve the Mn content in semisteel, and is beneficial to the utilization of resources and the reduction of the subsequent steelmaking production cost.
Description
Technical Field
The invention belongs to the technical field of steel smelting, and particularly relates to a method for improving chemical heat of vanadium extraction semisteel.
Background
China is a large country with vanadium-titanium magnetite, enterprises such as climbing steel, finished steel, Kun steel, Wei steel and the like adopt the vanadium-titanium magnetite to smelt, molten iron smelted by a vanadium-titanium magnetite blast furnace has higher vanadium content than common molten iron, and vanadium is an important resource, so vanadium must be extracted before the molten iron is smelted to prepare vanadium slag. At present, the production methods for preparing vanadium slag at home and abroad are more, and mainly comprise a new zealand ladle vanadium blowing process, a south Africa ladle vanadium extraction process, a Russian and Chinese converter vanadium extraction process and the like, and other vanadium extraction processes also comprise a vanadium-containing steel slag vanadium extraction process, a stone coal vanadium extraction process and the like. Wherein, the process for extracting vanadium by the converter is optimal, and the technical and economic indexes are the best.
The production process system of vanadium extraction in the converter at home and abroad is a continuous improvement of adding a coolant, process temperature and converting time. Vanadium extraction from molten iron is a selective oxidation technology. The vanadium extraction from converter gas is an exothermic process, the oxidation of elements such as [ Si ], [ Mn ], [ V ] and [ C ] makes the bath raise the temperature quickly, and the oxidation of [ Si ] and [ Mn ] occurs before the oxidation of [ V ], the vanadium extraction can not inhibit its reaction, and the conversion temperature of [ C ] and [ V ] is about 1385 deg.C, so to obtain high oxidation rate and [ V ] yield of [ V ], it must add vanadium extraction cooling agent, control the bath temperature to approach the conversion temperature of [ C ] and [ V ], to reach the purpose of vanadium extraction and carbon protection, and reduce [ V ] to below 0.05%. The temperature of the semi-steel at the end point of vanadium extraction is not too high, vanadium oxidation is mainly used at the early stage of the vanadium extraction process, vanadium reduction is mainly used at the later stage, but vanadium reduction is mainly used in the vanadium blowing process. Therefore, when the temperature is reduced, the coolant is added to reduce the temperature of the molten iron to a proper range, and vanadium in the semisteel is oxidized by controlling the blowing time and the process temperature in the converter smelting process, so that the yield is improved.
CN1789435A discloses a molten iron vanadium-extracting calcium-controlling coolant and a molten iron vanadium-extracting calcium-controlling process, wherein the vanadium-extracting coolant comprises the following chemical components in percentage by weight: 56-60% of iron scale, 30-40% of iron concentrate powder and 5-10% of binding agent, and the cooling agent can increase the extraction rate of vanadium and the grade of vanadium slag and stabilize the content of calcium oxide in the vanadium slag. CN101338351A discloses a vanadium extraction coolant, a preparation method and a use method thereof, the coolant is produced by using iron scale or vanadium extraction sludge, vanadium-containing iron ore concentrate and a binding agent as raw materials, and contains 80-95% of iron oxide and 3-6% of SiO 2 0.1-0.6% of V 2 O 5 、1-3％MgCl 2 . In the prior art, the problem of insufficient heat source exists when vanadium extraction semisteel is used for steelmaking, so that a method for improving the chemical heat deficiency of semisteel is needed to be solved.
Disclosure of Invention
The invention provides a method for improving the chemical heat of vanadium extraction semisteel, which aims to solve the problem of insufficient chemical heat of semisteel produced in a vanadium extraction workshop of a steel plant.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a method for improving the chemical heat of vanadium extraction semisteel, comprising the following steps:
after the molten iron is added into the converter, an oxygen lance is used for carrying out O 2 With CO 2 Blowing, wherein a high lance position is adopted 0.5-1.0 min in the early stage of blowing, a low lance position is adopted in the middle stage of blowing, and a low lance position is adopted 1-1.5 min before blowing is finished;
bottom blowing N in non-converting stage 2 Bottom blowing CO during converting;
adding a vanadium extracting coolant 2.5min before blowing, and adding manganese ore 3min before blowing.
In the technical scheme, furthermore, the blowing air supply intensity of the oxygen lance is 2.0-3.5 m 3 V (min. tFe), wherein O 2 With CO 2 The flow ratio of (A) is 0.05 to 0.30.
In the above technical scheme, further, bottom blowing N is performed in the non-converting stage 2 Has a strength of not more than 0.0015m 3 /(min·tFe)。
In the technical scheme, furthermore, the strength of bottom blowing CO in the blowing period is 0.25-0.5 m 3 /(min·tFe)。
In the above technical solution, further, the vanadium extraction coolant includes one or a combination of more of pig iron, iron scale, and ore.
In the technical scheme, the addition amount of the coolant is not more than 20kg/tFe, the addition amount of the manganese ore is 10-20 kg/tFe, and TMn in the manganese ore is more than or equal to 30%.
The invention is suitable for the top-bottom combined blowing vanadium extraction converter.
The invention has the beneficial effects that:
in the process of extracting vanadium, manganese ore is added, and simultaneously top-blown O is adopted 2 With CO 2 Mixed gas, bottom blowing N in non-converting stage 2 Bottom blowing CO during converting, canThe Mn content in the semisteel is improved, so that the chemical heat of the semisteel is improved, the problem of insufficient smelting heat source of a semisteel converter is solved, and the utilization of resources and the reduction of the subsequent steelmaking production cost are facilitated.
Detailed Description
Example 1
After molten iron is added into a 200t vanadium extraction converter, an oxygen lance is adopted for carrying out O 2 With CO 2 Blowing the mixed gas, wherein the high lance position is 1.8m at 0.5-1.0 min in the early stage of blowing, the low lance position is 1.7m at the middle stage of blowing, and the low lance position is 1.6m at 1-1.5 min before blowing; the blowing air supply intensity of the oxygen lance is 3.0m 3 V (min. tFe), wherein O 2 With CO 2 The flow ratio of (3) is 0.15; intensity of bottom blown CO during converting was 0.35m 3 V (min. tFe); after blowing for 1min, 18kg/tFe of coolant (pellets produced by iron scale) is added, and after blowing for 2.5min, 16kg/tFe of manganese ore with TMn 32% is added; discharging semisteel and vanadium slag after the blowing is finished, and bottom blowing N in the non-blowing stage 2 Has a strength of not more than 0.0015m 3 /(min. tFe). Iron melt containing [ C ]]4.32％、[V]0.298％、[Mn]0.211% of steel, in which the vanadium is extracted]3.61％、[V]0.028％、[Mn]0.063％。
Comparative example 1
After molten iron is added into a 200t vanadium extraction converter, an oxygen lance is adopted for carrying out O 2 Blowing, wherein the high lance position is 1.7m at 0.5-1.0 min in the early stage of blowing, the low lance position is 1.8m at the middle stage of blowing, and the low lance position is 1.6m at 1-1.5 min before blowing; the blowing air supply intensity of the oxygen lance is 3.0m 3 V (min. tFe); bottom blowing during converting N 2 Has a strength of 0.35m 3 V (min. tFe); after blowing for 1min, adding 35kg/tFe of coolant (pellets produced by iron scale); discharging semisteel and vanadium slag after the blowing is finished, and bottom blowing N in the non-blowing stage 2 Has a strength of not more than 0.0015m 3 /(min. tFe). Iron melt containing [ C ]]4.36％、[V]0.302％、[Mn]0.227% of the steel product obtained by vanadium extraction]3.56％、[V]0.031％、[Mn]0.023％。
Claims (6)
1. A method for improving the chemical heat of vanadium extraction semisteel is characterized by comprising the following steps: the method comprises the following steps:
after the molten iron is added into the converter, the method adoptsOxygen lance for carrying out O 2 With CO 2 Blowing the mixed gas, wherein a high lance position is adopted 0.5-1.0 min in the early stage of blowing, a low lance position is adopted in the middle stage of blowing, and a low lance position is adopted 1-1.5 min before blowing is finished;
bottom blowing N in non-converting stage 2 Bottom blowing CO during converting;
adding a vanadium extracting coolant 2.5min before blowing, and adding manganese ore 3min before blowing.
2. The method for improving the chemical heat of the vanadium extraction semisteel according to claim 1, is characterized in that: the blowing air supply intensity of the oxygen lance is 2.0-3.5 m 3 V (min. tFe), wherein O 2 With CO 2 The flow ratio of (A) is 0.05 to 0.30.
3. The method for improving the chemical heat of the vanadium extraction semisteel according to claim 1, is characterized in that: bottom blowing N in non-converting stage 2 Has a strength of not more than 0.0015m 3 /(min·tFe)。
4. The method for improving the chemical heat of the vanadium extraction semisteel according to claim 1, is characterized in that: the strength of bottom blown CO during converting is 0.25-0.5 m 3 /(min·tFe)。
5. The method for improving the chemical heat of the vanadium extraction semisteel according to claim 1, is characterized in that: the vanadium extracting coolant comprises one or more of pig iron blocks, iron scales and ores.
6. The method for improving the chemical heat of the vanadium extraction semisteel according to claim 1, is characterized in that: the addition amount of the coolant is not higher than 20kg/tFe, the addition amount of the manganese ore is 10-20 kg/tFe, and TMn in the manganese ore is more than or equal to 30%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210806200.0A CN115074481A (en) | 2022-07-08 | 2022-07-08 | Method for improving chemical heat of vanadium extraction semisteel |
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| CN202210806200.0A CN115074481A (en) | 2022-07-08 | 2022-07-08 | Method for improving chemical heat of vanadium extraction semisteel |
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| CN202210806200.0A Pending CN115074481A (en) | 2022-07-08 | 2022-07-08 | Method for improving chemical heat of vanadium extraction semisteel |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101962698A (en) * | 2009-07-24 | 2011-02-02 | 攀钢集团攀枝花钢铁研究院有限公司 | Semisteel converter steelmaking method |
| CN103397132A (en) * | 2013-07-11 | 2013-11-20 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for enhancing erosion resistance of vanadium extraction converter lining |
| CN108048618A (en) * | 2018-01-29 | 2018-05-18 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of converter CO2The method of vanadium extraction |
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2022
- 2022-07-08 CN CN202210806200.0A patent/CN115074481A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101962698A (en) * | 2009-07-24 | 2011-02-02 | 攀钢集团攀枝花钢铁研究院有限公司 | Semisteel converter steelmaking method |
| CN103397132A (en) * | 2013-07-11 | 2013-11-20 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for enhancing erosion resistance of vanadium extraction converter lining |
| CN108048618A (en) * | 2018-01-29 | 2018-05-18 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of converter CO2The method of vanadium extraction |
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