CN104673957B - Containing vanadium and chromium molten iron compounding method - Google Patents
Containing vanadium and chromium molten iron compounding method Download PDFInfo
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Abstract
The present invention relates to containing vanadium and chromium molten iron compounding method, belong to field of iron and steel smelting.Present invention solves the technical problem that and be to provide containing vanadium and chromium molten iron compounding method.Containing vanadium and chromium molten iron compounding method, iron oxides powder of jetting in comprising the steps: spray gun immerses containing vanadium and chromium molten iron, carrier gas is nitrogen；Use bottom blowing mode molten iron to be jetted CO simultaneously2, winding-up obtains vanadium chromium slag and half steel after terminating.The present invention can reduce iron oxides consumption, improve vanadium and the oxygenation efficiency of chromium, the utilization of the oxygenation efficiency of minimizing carbon, beneficially resource and the reduction of vanadium extraction chromium production cost.
Description
Technical field
The present invention relates to containing vanadium and chromium molten iron compounding method, belong to field of iron and steel smelting.
Background technology
China is vanadium titano-magnetite big country, climb steel, hold steel, Kun Gangdeng enterprise all be use vanadium titano-magnetite smelt, vanadium titanium
The molten iron content of vanadium that magnetic iron ore blast furnace process goes out is high, and vanadium is a kind of important resource, therefore necessary vanadium extraction, system before molten iron-steelmaking
Take vanadium slag.At present, the production method producing vanadium slag both at home and abroad is more, mainly has New Zealand's ladle to blow vanadium technique, South Africa shaking ladle
Process for extracting vanadium, Russian and Chinese vanadium extraction by converter blowing technique etc., other process for extracting vanadium also includes v-bearing steel slag vanadium extraction, extracting vanadium from stone coal
Technique etc..
The production process system of vanadium extraction by converter blowing is updating of addition coolant+process temperature+duration of blast both at home and abroad.Molten iron
Vanadium extraction is a selective oxidation technology.Converter supply vanadium extraction is an exothermic process, the elemental oxygen such as [Si], [Mn], [V], [C]
Changing makes molten bath be rapidly heated, and [Si], [Mn] oxidation generation are before [V] aoxidizes, and vanadium extraction can not suppress it to react, and [C],
[V] conversion temperature, about at about 1385 DEG C, therefore to obtain high oxidation rate and [V] yield of [V], it is necessary to add vanadium-raising cooling agent,
Control bath temperature to be allowed to approach [C], [V] conversion temperature, reach vanadium extraction and protect the purpose of carbon, [V] is down to less than 0.05%.Carry
The terminal half steel temperature of vanadium is unsuitable too high, and vanadium extracting process early stage is oxidized to main with vanadium, and the later stage is reduced to main with vanadium, but blowing vanadium process is vanadium
It is reduced to main.Make molten iron temperature drop to suitable scope so use addition coolant when cooling, converter smelting passes through
Duration of blast and the control of process temperature, aoxidize the vanadium in half steel, improves recovery rate.
Flos Bombacis Malabarici high lattice vanadium titano-magnetite mineral species is many, and ore structures is complicated, select the ferrum in smelting separation Ore, vanadium, titanium,
The alloying technology difficulty such as chromium, nickel, cobalt are big, are worldwide technological puzzle to be captured.Under normal circumstances, in schreyerite thing
Vanadium is with V3+Form be solid-solution in magnetic iron ore lattice, formed vanadium iron spinelle；Titanium is mainly with oxide TiO2Presented in titanium
In ferrum spar and ilmenite.Cr3+With Fe3+Ionic radius approximates, and ferric ion in trivalent chromium displacement titanomagnetite, in endoplasm
With as.Chromium is as vanadium, and together with ferrum symbiosis, mineral are FeO (V, Cr)2O3Spinelle.Chromium and vanadium 80% in ore dressing process
More than it is enriched in iron ore concentrate.Preferable raw material basis has been established for jointly being extracted vanadium chromium by metallurgical method.Many scientific research institutions
And colleges and universities to Hongge Deposit from selecting and purchasing, smelt, extract and follow-up vanadium chromium separate all done substantial amounts of work, established certain
Theory and practice basis.Capture multiple technical barrier at present, but also have many key technology bottlenecks, technique skill away from industrialization
Art is the most immature.
In existing blast furnace ironmaking-pneumatic steelmaking process for extracting vanadium, the titanium in vanadium titano-magnetite mainly enters blast furnace with perovskite form
Slag phase, vanadium, chromated oxide are reduced entrance ferrum phase, and the oxidized point forming vanadium iron, ferrochrome respectively during vanadium extraction by converter blowing
Spinel structure enters slag and forms vanadium slag mutually, remains in the vanadium chromium in half steel and can enter height by partial oxidation in further steelmaking process
In the steelmaking slag of basicity.Owing to current molten iron chromium content is low, production technology, just for the recovery of Vanadium in Vanadium Residue, adopts the technology that
High temperature sodium roasting-water logging process for extracting vanadium.Due to the similarity of vanadium chromium physical chemistry behavior in metallurgical process, with red lattice
Ore deposit be raw material vanadium chromium hot melt vanadium extracting process in the oxidation of substantial amounts of chromium certainly will be made to enter in slag, form the vanadium chromium slag of high chrome contents.
From the point of view of existing document, smelt about vanadium chromium hot melt and only have a small amount of commerical test report, owing to there being the participation of chromium, contain
Vanadium chromium hot melt oxidation characteristic in converter can be varied from accordingly, and chromated oxide existence in slag can affect the physics of vanadium chromium slag
Chemical property, can cause thermodynamic condition and the change of distribution in slag and in half steel of vanadium chromium that vanadium chromium aoxidizes.
CN1789435 discloses a kind of vanadium extraction from hot metal control calcium coolant and vanadium extraction from hot metal control calcium technique, the chemistry of its vanadium-raising cooling agent
Composition (Wt%) is: iron scale 56-60%, fine iron breeze 30-40%, bonding agent 5-10%, and its vanadium extraction from hot metal control calcium technique is
Adding above-mentioned coolant at Primary period, this coolant can increase extraction ratio and the v slag grade of vanadium, stablize vanadium slag calcium oxide content.
CN101338351 discloses a kind of vanadium-raising cooling agent and preparation method thereof and using method, and this coolant is with iron scale or vanadium extraction
Mud, it is raw material production containing vanadium iron concentrate, bonding agent, containing the iron oxides of 80%-95%, SiO2,0.1-0.6% of 3-6%
V2O5, 1-3%MgCl2.The using method of this coolant passes through oxygen supply by lance for entering furnace rear at vanadium-bearing hot metal, and oxygen supply pressure is
0.6～0.8MPa, oxygen-supplying amount is 8～12m3/t molten iron, and oxygen supply time is 240～340s；In stove, add vanadium-raising cooling agent enter
Row Control for Kiln Temperature, the bath temperature after oxygen blast terminates is 1360～1420 DEG C, it is thus achieved that vanadium slag and half steel.
In terms of above-mentioned prior art, all just for the recovery of Vanadium in Vanadium Residue, the Adding Way of coolant is disposable addition, its
Vanadium oxygenation efficiency needs to be improved further.Process to containing vanadium and chromium molten iron, does not have pertinent literature.
Summary of the invention
Present invention solves the technical problem that and be to provide containing vanadium and chromium molten iron compounding method.
Containing vanadium and chromium molten iron compounding method of the present invention, comprises the steps:
Spray gun immerses winding-up iron oxides powder in containing vanadium and chromium molten iron, and carrier gas is nitrogen；Use bottom blowing mode that molten iron is jetted simultaneously
CO2, winding-up obtains vanadium chromium slag and half steel after terminating.
Wherein, nitrogen pressure is 0.3～0.8MPa, and the winding-up amount of iron oxides powder is 20～60kg/tFe, the spray of iron oxides powder
Blowing speed is 50～100kg/min, and gun slot insertion depth is distance Iron bottom portion 500～1500mm.
Further, bottom blowing CO2Consumption controls 0.10～0.50m3Between/(min tFe).
Further, at least one during described iron oxides is Iron Ore Powder, iron scale and iron oxide red.
Further, the composition of described containing vanadium and chromium molten iron is: the total amount of [V]+[Cr] is 0.5%～1.0%, carbon content be 4.0%～
5.0%.
The present invention uses Dual-Phrase Distribution of Gas olid blowing process to carry out vanadium extraction, and compared with prior art, the present invention can reduce iron oxides and use
Amount, raising vanadium and the oxygenation efficiency of chromium, the utilization of the oxygenation efficiency of minimizing carbon, beneficially resource and vanadium extraction chromium production cost reduce.
Detailed description of the invention
Containing vanadium and chromium molten iron compounding method of the present invention, comprises the steps:
Spray gun immerses winding-up iron oxides powder in containing vanadium and chromium molten iron, and carrier gas is nitrogen；Simultaneously to molten iron bottom blowing CO2Gas, spray
Vanadium chromium slag and half steel is obtained after blowing bundle.
Wherein, nitrogen pressure is 0.3～0.8MPa, and the winding-up amount of iron oxides powder is 20～60kg/tFe, the spray of iron oxides powder
Blowing speed is 50～100kg/min, and gun slot insertion depth is distance Iron bottom portion 500～1500mm.
During winding-up, bottom blowing CO2Consumption controls 0.10～0.50m3Between/(min tFe).
Powder containing iron oxides is all applicable to the present invention, it is preferred that described iron oxides is Iron Ore Powder, iron scale, ferrum
At least one in red or in the higher pulverulent material of other oxides-containing irons.
In the present invention, the composition of containing vanadium and chromium molten iron is: the total amount of [V]+[Cr] is between 0.5%～1.0%, and carbon content is 4.0%～5.0%
Between, remaining composition is without particular/special requirement.In the present invention, containing vanadium and chromium molten iron uses existing technique to prepare, as used technique to be: high
Chromium vanadium titanium octahedral iron ore blast furnace or electric furnace smelting containing vanadium and chromium molten iron.In the present invention, [V]+[Cr] represents the total of content of vanadium and chromium content
With, it is identical that other are similar to.Content of the present invention is weight percentage.
The present invention is mainly suitable for containing vanadium and chromium molten iron and carry out vanadium chromium slag producing process, it specifically can use following steps:
(1) use Dual-Phrase Distribution of Gas olid blowing process carry out vanadium extraction, i.e. ladle enter into process station after, spray gun is immersed in molten iron
Winding-up iron oxides powder, carrier gas is nitrogen；
(2) spray gun immerses winding-up iron oxides powder in molten iron, and described iron oxides is for including Iron Ore Powder, iron scale, iron oxide red
Deng the compositions of one or more containing iron oxides；
(3) nitrogen pressure controls between 0.3～0.8MPa, and powder injection amount is between 20～50kg/tFe, and powder is jetted
Speed controlling between 50～100kg/min, gun slot insertion depth by distance bag/tank bottoms distance in terms of 500～1500mm；
(4) use bottom blowing mode that molten iron is carried out CO simultaneously2Winding-up, bottom blowing CO2Consumption control 0.10～
0.50m3Between/(min tFe), winding-up claws/pull out vanadium chromium slag after terminating, and gained half steel is transported to steelmaking converter and makes steel.
Other concrete operations modes and the condition of the present invention NM blowing vanadium extraction all can be same as the prior art, to this ability
Known in field technique personnel, therefore not to repeat here.
Below in conjunction with embodiment, the detailed description of the invention of the present invention is further described, the most therefore limits the present invention to institute
Among the scope of embodiments stated.
Embodiment 1
After 80t ladle entrance processes station, iron oxides powder of jetting in spray gun immerses molten iron, carrier gas is nitrogen, powder
Injection amount is at 20kg/tFe, and gun slot insertion depth distance bag/tank bottoms distance 1500mm, nitrogen pressure controls at 0.3MPa
Between, powder injecting velocity controls at 50kg/min, uses bottom blowing CO simultaneously2Mode is stirred and protects carbon, bottom blowing CO2With
Amount controls at 0.50m3/ (min tFe), jets and pulls vanadium chromium slag out after terminating, and gained half steel is transported to steelmaking converter and makes steel.Ferrum
Water vanadium drops to 0.022% from 0.161%, and chromium drops to 0.087% from 0.326%, and oxidation of coal rate is 7.3%.
Embodiment 2
After 200t hot-metal bottle entrance processes station, iron oxides powder of jetting in spray gun immerses molten iron, carrier gas is nitrogen, powder
Injection amount is at 60kg/tFe, and gun insertion depth is with apart from tank bottoms distance 500mm, and nitrogen pressure controls at 0.8MPa, powder
Agent injecting velocity controls at 100kg/min, uses bottom blowing CO simultaneously2Mode is stirred and protects carbon, bottom blowing CO2Consumption controls
At 0.30m3/ (min tFe), winding-up claws vanadium chromium slag after terminating, and gained half steel is transported to steelmaking converter and makes steel.Molten iron vanadium from
0.369% drops to 0.030%, and chromium drops to 0.059% from 0.217%, and oxidation of coal rate is 7.9%.
Embodiment 3
After 140t hot-metal bottle entrance processes station, iron oxides powder of jetting in spray gun immerses molten iron, carrier gas is nitrogen, powder
Injection amount is at 30kg/tFe, and gun insertion depth is with apart from tank bottoms distance 1000mm, and nitrogen pressure controls at 0.7MPa,
Powder injecting velocity controls at 80kg/min, uses bottom blowing CO simultaneously2Mode is stirred and protects carbon, bottom blowing CO2Consumption controls
At 0.10m3/ (min tFe), winding-up claws vanadium chromium slag after terminating, and gained half steel is transported to steelmaking converter and makes steel.Molten iron vanadium from
0.268% drops to 0.030%, and chromium drops to 0.13% from 0.57%, and oxidation of coal rate is 9.6%.
To sum up, the processing method of the present invention, it is possible not only to reduce vanadium and the content of chromium in molten iron, moreover it is possible to oxidation of coal rate be reduced to
Less than 9.6%, compared with the oxidation of coal rate about 16% of existing technical finesse, the present invention can reduce the oxygenation efficiency of carbon, is conducive to
The utilization of resource and vanadium extraction production cost reduce.
Claims (3)
1. containing vanadium and chromium molten iron compounding method, it is characterised in that comprise the steps:
Spray gun immerses winding-up iron oxides powder in containing vanadium and chromium molten iron, and carrier gas is nitrogen；Use bottom blowing mode that molten iron is jetted simultaneously
CO2, winding-up obtains vanadium chromium slag and half steel after terminating；Nitrogen pressure is 0.3～0.8MPa, the winding-up amount of iron oxides powder be 20～
60kg/tFe, the injecting velocity of iron oxides powder is 50～100kg/min, gun slot insertion depth be distance Iron bottom portion 500～
1500mm；CO2Consumption is 0.10～0.50m3/(min·tFe)。
Containing vanadium and chromium molten iron compounding method the most according to claim 1, it is characterised in that: described iron oxides is iron mine
At least one of powder, iron scale and iron oxide red.
Containing vanadium and chromium molten iron compounding method the most according to claim 1 and 2, it is characterised in that: described containing vanadium and chromium molten iron
Composition be: the total amount of [V]+[Cr] is 0.5%～1.0%, and carbon content is 4.0%～5.0%.
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| CN110195142A (en) * | 2019-07-12 | 2019-09-03 | 攀钢集团攀枝花钢铁研究院有限公司 | The method for improving vanadium extraction by converter blowing vanadium yield |
| CN111763794B (en) * | 2020-06-10 | 2021-05-14 | 北京科技大学 | Method for smelting stainless steel by mixed blowing of chromium ore powder and carbon powder in TSR converter |
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| CN102127613A (en) * | 2011-02-25 | 2011-07-20 | 河北钢铁股份有限公司承德分公司 | Method for extracting vanadium through composite blowing of converter |
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| CN103981322A (en) * | 2014-05-05 | 2014-08-13 | 攀钢集团攀枝花钢铁研究院有限公司 | Top-bottom combined blowing converter vanadium extraction method |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102127613A (en) * | 2011-02-25 | 2011-07-20 | 河北钢铁股份有限公司承德分公司 | Method for extracting vanadium through composite blowing of converter |
| CN102660659A (en) * | 2012-04-20 | 2012-09-12 | 北京科技大学 | Converter vanadium extraction process adopting top blowing oxygen lance to blow cooling agents |
| CN103952517A (en) * | 2014-04-24 | 2014-07-30 | 攀钢集团攀枝花钢铁研究院有限公司 | Treatment method for water containing vanadium, chromium and iron and smelting process for high chromium vanadium titanium magnetite concentrate |
| 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 |
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