CN101691623B - Process for smelting vanadium-containing molten iron converter - Google Patents
Process for smelting vanadium-containing molten iron converter Download PDFInfo
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- CN101691623B CN101691623B CN2009103092038A CN200910309203A CN101691623B CN 101691623 B CN101691623 B CN 101691623B CN 2009103092038 A CN2009103092038 A CN 2009103092038A CN 200910309203 A CN200910309203 A CN 200910309203A CN 101691623 B CN101691623 B CN 101691623B
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- slag
- converter
- vanadium
- slag making
- molten iron
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Abstract
The invention belongs to the technical field of ferrous metallurgy, in particular relates to a process for smelting a vanadium-containing molten iron converter, and solves the technical problem of improving the service life of the vanadium-containing molten iron converter. The process comprises two times of slag making, namely in the first time of slag making, reducing the vanadium content of blown molten iron to below 0.03 percent and discharging formed primary slag, and adding slag making materials in the converter for the second time for smelting. Slag with high vanadium content and phosphor content formed in the first time of slag making is removed possibly, and converter slag which has high melting point and low oxidability and is suitable for slag splashing is formed in the second times of slag making, so that the service life of the vanadium-containing molten iron converter is obviously improved. The method not only can effectively ensure smooth operation of the converter steel making process, but also can produce converter slags more suitable for slag splashing to greatly improve the service life of the converter.
Description
Technical field
The invention belongs to technical field of ferrous metallurgy, particularly a kind of technology of vanadium-bearing hot metal converter smelting.
Background technology
At present, the main means of raising converter lining life are to optimize the converter type of furnace, raising refractory brick quality, the maintenance of reinforcement converter lining, slag splashing.
Can reduce the damage of furnace lining mechanical erosion through optimizing the converter type of furnace, reduce loss.
Improve the refractory brick quality refractoriness of refractory brick is reached more than 1780 ℃, high temperature break resistant intensity (1400 ℃ * 0.5h)>=and 8MPa, loading softening begins 1600 ℃ of temperature, volume density>=2.95g/cm
3Realize improving the purpose in furnace life.
Strengthen converter lining and safeguard it then is in converter steelmaking process, when the local generation of body of heater is corroded, in time to repair with refractory materials, refractory materials is generally magnesian, and wherein MgO content is 60～90%.
Slag splashing reaches the slag of HMP, low oxidative through the composition and the performance of technological operation through adjustment converter terminal slag, and through oxygen gun system blown inert gas this slag is spattered to body of heater formation resist, reaches the purpose that improves furnace life.The adjustment slag is to reach the purpose that improves converter lining life by MgO content and FeO content in the adjustment molten steel at present; Cardinal principle is: MgO is 8%～12% in the adjustment slag; MgO content is reached or near saturation value; MgO shifts to slag in the minimizing furnace lining; Reduce the fire proof material of furnace lining erosive velocity, thereby improve furnace life; Reduce FeO content in the slag, reduce low melting point phase (calcium ferrite) growing amount in the slag, reduce fire proof material of furnace lining and corrode.
But the existing raising of employing converter lining life is not obvious for the effect in raising vanadium-bearing hot metal smelting converter furnace life; Converter lining life is at 5000～6000 stoves; Converter duration of service is 185～220 days, and converter need fettling since 800～1000 stoves, and mending material consumption is at 345～430 tons during the stove labour.
Summary of the invention
The technical problem that the present invention solved is a kind of technology of vanadium-bearing hot metal converter smelting, is used to improve converter lining life.
Technology of the present invention is included in the converter and adds slag making materials and carry out slag making, it is characterized in that: described slag making slag making at twice: the content of vanadium of blowing back molten iron is reduced to below 0.03%, discharge the first slag that forms; In converter, adding slag making materials for the second time again smelts.
The reason that adopts twice slag making is that the contriver finds in the vanadium-bearing hot metal converter steelmaking process, because vanadium is bigger to the avidity of oxygen, and the various low-melting vannadate of the preferential oxidized formation of vanadium.If adopt a traditional slag making to smelt, can make converter smelting initial stage scorification slag difficulty also to be easy to sticking rifle, the smelting technology difficulty strengthens, and vannadate and silicate form sosoloid simultaneously, greatly reduce the temperature of fusion (V of slag
2O
5Influence to the slag melting properties: initial melting temperature, melting temperature, fine melt temperature all reduce, and are benchmark with the melting temperature, average every 1%V
2O
5Reduce by 27 ℃ approximately), this slag is difficult to adapt to slag splashing.Existence based on P and V influences converter lining life; So remove first slag phosphorous, vanadium through the slag making first time; Make the low-melting vannadate content in the slag that the second time, converter slag-making formed be lower than 1.0% as much as possible; The converter slag that is fit to slag splashing for converter slag-making formation second time HMP lays the first stone, and guarantees to smelt for the second time normally to carry out.
Vanadium is wherein removed in slag making for the first time as far as possible, and control slag making for the first time terminal point makes to form CaO/SiO
22.2～2.8, V
2O
54.5～7.5%, TFe12～16%, the first slag of P1.0～1.4%, wherein vanadium and phosphorus content is higher.Used slag making materials is quickened lime and steel-smelting sewage sludge; In tapping molten steel per ton; The quickened lime add-on is 20～30kg, and the add-on of steel-smelting sewage sludge is 4～7kg, and effect is the V that in converting process, removes in the molten iron; Can also remove the P that influences metallurgical effect, meet the slag of above-mentioned requirements with formation.
The rational oxygen blast control of lance position of slag making for the first time: the oxygen blast control of lance position guarantees initial stage slag effectuation slag at 1.2～1.6m, avoids sticking rifle.The control blowing oxygen quantity is 20～30Nm
3(in tapping molten steel per ton), 1400～1460 ℃ of temperature.
The smelting of slag making for the second time adopts slag making materials commonly used to smelt can realize normal purpose of smelting.Secondary slag making materials is by quickened lime, and light dolomite and composite fluxing medium are formed, in tapping molten steel per ton; The quickened lime add-on is 40～50kg; The light dolomite add-on is 20～30kg, and the composite fluxing medium add-on is 7～12kg, and " composite fluxing medium " mainly is to contain SiO
2, the material of MnO and part oxides-containing iron consists of TFe 10～20%, SiO
245～65%, MnO 3～5%, and all the other are impurity; TFe is that the material by ferriferous oxide provides, like iron scale, and steel scale of steel rolling etc., SiO
2Be to provide, and MnO is provided by manganese ore by silica sand and silica.Main purpose is the P that in converting process, further removes in the molten iron, forms the converter slag of HMP, the suitable slag splashing of low oxidative simultaneously.For the first time in the slagging process, molten iron is Si in converter among the present invention, the equal complete oxidation of Mn, slag making for the second time is difficult to slagging, add composite fluxing medium after, making has enough TFe, SiO in the slag
2And MnO, reach the purpose of quick formation slag.
The oxygen blast of slag making for the second time control of lance position guarantees that at 0.8～1.4m process scorification is good, changes and passes through.The control blowing oxygen quantity is 25～35Nm
3(in tapping molten steel per ton), the slag making terminal temperature is 1640～1660 ℃.
The inventive method provides a kind of vanadium-bearing hot metal (molten iron V content 0.15%～0.20%; The low content of vanadium of genus) converter smelting improves the method in furnace life; This method is twice slag practice, and slagging process forms the first slag of higher content of vanadium and phosphorus content mainly through rational slag charge amount control, oxygen blast control of lance position, blowing oxygen quantity control and temperature controlling; Guarantee the direct motion of subsequent smelting technology; The slag that slag making for the first time forms is got rid of as far as possible, and slag making for the second time forms HMP, low oxidative is fit to the converter slag of slag splashing, thereby significantly improves vanadium-bearing hot metal smelting converter furnace life.This method can not only effectively make converter steelmaking process direct motion more, obtains being more suitable for the converter slag of slag splashing simultaneously, and converter lining life also is greatly improved.
Embodiment
Below through to the description of specific embodiment of the invention explanation but do not limit the present invention.
Embodiment 1
In the practice, when the 80t converter adopts vanadium-bearing hot metal to smelt, be blended into molten iron when beginning oxygen rifle blowing down, add 20～30kg quickened lime in tapping molten steel per ton, 4～7kg sludge ball of steel smelting, and according to molten iron Si content, by (CaO/SiO in the slag that forms
2) 2.2～2.8 adding composite fluxing mediums, the oxygen blast control of lance position is at 1.2～1.6m.At blowing oxygen quantity 20～30Nm
3When (in tapping molten steel per ton), 1400～1460 ℃ of temperature, stop blowing, and the slag that forms is got rid of to slag ladle in converter as far as possible.The slag principal constituent that forms is CaO/SiO
22.2～2.8, V
2O
54.5～7.5%, TFe12～16%, P1.0～1.4%, vanadium-bearing hot metal V content is 0.15%～0.20% before the blowing, blowing back molten iron V content reduces to 0.01%～0.03%.In the practical application, slag can bleed off gets rid of 50～70%, makes V in the converter smelting endpoint slag
2O
5＜1.0%, realize significantly improving vanadium-bearing hot metal smelting converter furnace life.
Before not using this method, converter lining life is at 5000～6000 stoves, and converter duration of service is 185～220 days, and converter is since 800～1000 stove fettling, and mending material consumption is at 345～430 tons during the stove labour.After using this method, converter lining life is at 8000～9300 stoves, and converter duration of service is 300～340 days, and converter is since 3000 stove fettling, and mending material consumption is at 215～270 tons during the stove labour.
Claims (2)
1. the technology of vanadium-bearing hot metal converter smelting is included in and adds slag making materials in the converter and carry out slag making, and V content is 0.15%～0.20% in the said vanadium-bearing hot metal;
It is characterized in that: described slag making slag making at twice: the content of vanadium of blowing back molten iron is reduced to below 0.03%, discharge the first slag that forms; In converter, adding slag making materials for the second time again smelts;
The slag making materials that slag making is for the first time adopted is quickened lime and steel-smelting sewage sludge, in tapping molten steel per ton, adds quickened lime 20～30kg, steel-smelting sewage sludge 4～7kg; The oxygen blast control of lance position is 20～30Nm at 1.2～1.6m in tapping molten steel blowing oxygen quantity per ton
3, 1400～1460 ℃ of temperature;
Slag making materials is by quickened lime for the second time, and light dolomite and composite fluxing medium are formed, and in tapping molten steel per ton, adds quickened lime 40～50kg, light dolomite 20～30kg, composite fluxing medium 7～12kg; Said composite fluxing medium is to contain SiO
2, the material of MnO and part oxides-containing iron consists of TFe 10～20%, SiO
245～65%, MnO 3～5%, and all the other are impurity; The oxygen blast control of lance position is 25～35Nm3 at 0.8～1.4m in tapping molten steel blowing oxygen quantity per ton; The slag making terminal temperature is 1640～1660 ℃.
2. the technology of vanadium-bearing hot metal converter smelting according to claim 1 is characterized in that: first slag making makes blowing back molten iron content of vanadium reduce to 0.01%～0.03%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009103092038A CN101691623B (en) | 2009-11-02 | 2009-11-02 | Process for smelting vanadium-containing molten iron converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009103092038A CN101691623B (en) | 2009-11-02 | 2009-11-02 | Process for smelting vanadium-containing molten iron converter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101691623A CN101691623A (en) | 2010-04-07 |
| CN101691623B true CN101691623B (en) | 2012-05-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009103092038A Expired - Fee Related CN101691623B (en) | 2009-11-02 | 2009-11-02 | Process for smelting vanadium-containing molten iron converter |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102382927B (en) * | 2010-09-03 | 2013-07-10 | 攀钢集团钢铁钒钛股份有限公司 | Molten iron smelting method and vanadium-containing molten iron smelting method |
| CN102605231B (en) * | 2011-12-22 | 2014-05-14 | 内蒙古科技大学 | Method for smelting niobium steel and vanadium steel |
| CN103194565B (en) * | 2013-04-28 | 2014-12-31 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for synchronously dephosphorization and vanadium extraction of vanadium-containing molten iron |
| CN103320566B (en) * | 2013-06-26 | 2015-09-09 | 攀钢集团攀枝花钢铁研究院有限公司 | Double slag process smelts the method for half steel |
| CN103409595B (en) * | 2013-07-24 | 2015-02-18 | 攀钢集团攀枝花钢铁研究院有限公司 | Dephosphorization and steel-making method of vanadium-containing molten iron |
| CN104711390B (en) * | 2015-03-16 | 2016-11-02 | 攀钢集团研究院有限公司 | A kind of hot metal containing low silicon vanadium extraction by converter blowing chromium slag state regulator and preparation method thereof |
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2009
- 2009-11-02 CN CN2009103092038A patent/CN101691623B/en not_active Expired - Fee Related
Non-Patent Citations (2)
| Title |
|---|
| 戈文荪 等.攀钢转炉提钒工艺的技术变革与展望.《钢铁钒钛》.2001,第22卷(第3期),11-14. * |
| 高剑辉.转炉提钒工艺对钒渣质量的影响.《金属世界》.2008,(第4期),8-11. * |
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