CN104498657A - Method for extracting vanadium slag from vanadium-containing molten iron - Google Patents
Method for extracting vanadium slag from vanadium-containing molten iron Download PDFInfo
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- CN104498657A CN104498657A CN201510005929.8A CN201510005929A CN104498657A CN 104498657 A CN104498657 A CN 104498657A CN 201510005929 A CN201510005929 A CN 201510005929A CN 104498657 A CN104498657 A CN 104498657A
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Abstract
The invention relates to a method for extracting vanadium slag from vanadium-containing molten iron, belonging to the field of steel smelting. The technical problem to be solved by the invention is to provide a method for extracting vanadium slag from vanadium-containing molten iron, which comprises the following steps: a. stirring vanadium-containing molten iron, wherein the stirring speed is 50-150 r/min, the immersion depth of a stirring head is 200-800 mm, and the stirring time is 20-40 minutes; b. adding iron oxide into the molten iron, wherein the addition is 10-50 kg/t Fe; c. after adding the iron oxide in the step b, blowing oxygen into the molten iron, wherein the oxygen pressure is 0.2-0.5 MPa, and the oxygen flow is 200-500 Nm<3>; and d. after stirring, removing vanadium slag to obtain semisteel. According to the method provided by the invention, the cooling agent consumption can be reduced, the vanadium oxidation rate can be improved, and the carbon oxidation rate can be lowered, thereby being beneficial to utilization of resources and lowering of vanadium extraction production cost.
Description
Technical field
The present invention relates to the method extracting vanadium slag from vanadium-bearing hot metal, belong to field of iron and steel smelting.
Background technology
China is vanadium titano-magnetite big country, and climb steel, hold steel, Kun Gangdeng enterprise adopts vanadium titano-magnetite to smelt, the molten iron content of vanadium that vanadium titano-magnetite blast-furnace smelting goes out is high, and vanadium is a kind of important resource, therefore must vanadium extraction before molten iron-steelmaking, produces vanadium slag.At present, the production method producing vanadium slag is both at home and abroad more, and mainly contain New Zealand's hot metal ladle and blow vanadium technique, South Africa shaking ladle process for extracting vanadium, Russia and Chinese vanadium extraction by converter blowing technique etc., other process for extracting vanadium also comprises v-bearing steel slag vanadium extraction, process for extracting vanadium from stone coal etc.
The production process system of domestic and international vanadium extraction by converter blowing is and adds updating of refrigerant+process temperature+duration of blast.Vanadium extraction from hot metal is a selective oxidation technology.The vanadium extraction of converter air feed is an exothermic process, [Si], [Mn], [V], element oxide such as [C] makes molten bath be rapidly heated, and [Si], before [Mn] oxidation occurs in [V] oxidation, vanadium extraction can not suppress it to react, and [C], [V] invert point is greatly about about 1385 DEG C, therefore high oxidation rate and [V] yield of [V] will be obtained, vanadium-raising cooling agent must be added, control bath temperature to make it to approach [C], [V] invert point, reach the object that carbon is protected in vanadium extraction, [V] is down to less than 0.05%.The terminal half steel temperature of vanadium extraction is unsuitable too high, and vanadium extracting process is oxidized to master with vanadium early stage, and the later stage is reduced to master with vanadium, but to blow vanadium process be that vanadium is reduced to master.So what adopt when lowering the temperature is add refrigerant to make molten iron temperature drop to suitable scope, by the control of duration of blast and process temperature in converter smelting, by the vanadium oxidation in half steel, improve recovery rate.
Publication number is that the Chinese patent application of CN1789435A discloses a kind of vanadium extraction from hot metal control calcium refrigerant and vanadium extraction from hot metal control calcium technique, the chemical composition (Wt%) of its vanadium-raising cooling agent is: iron scale 56 ~ 60%, fine iron breeze 30 ~ 40%, bonding agent 5 ~ 10%, this refrigerant can increase extraction yield and the v slag grade of vanadium, stablizes vanadium slag calcium oxide content.Publication number is that the Chinese patent application of CN101338351A discloses a kind of vanadium-raising cooling agent and preparation method thereof and using method, this refrigerant with iron scale or vanadium extraction mud, containing vanadium iron concentrate, bonding agent for raw material production, containing the ferriferous oxide of 80% ~ 95%, the SiO of 3 ~ 6%
2, 0.1 ~ 0.6% V
2o
5, 1 ~ 3%MgCl
2.
From above-mentioned prior art, adopt mechanical mixing method+ferriferous oxide+blowing oxygen to carry out vanadium extraction and yet there are no report.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of method extracting vanadium slag from vanadium-bearing hot metal.
The present invention extracts the method for vanadium slag from vanadium-bearing hot metal, comprises the steps:
A, carry out stir process to vanadium-bearing hot metal, stirring velocity is 50 ~ 150r/min, and stirring-head immersion depth is 200 ~ 800mm, churning time 20 ~ 40min;
B, in the 3min that a step stir process starts, add the oxide compound of iron in molten iron, add-on is 10 ~ 50kg/tFe;
C, add iron in b step oxide compound after, carry out oxygen blast to molten iron, oxygen pressure is between 0.2 ~ 0.5MPa, and oxygen flow is 200 ~ 500Nm
3between;
D, stirring claw vanadium slag after terminating, and obtain half steel.
Further, preferably, in described a step, stirring velocity is 120 ~ 150r/min, and stirring-head immersion depth is 500 ~ 800mm, churning time 30 ~ 40min.
In described b step, the oxide addition of iron is preferably 30 ~ 50kg/tFe.
Further, preferably adopt Self comsuming Single Hole Oxygen Lance to carry out oxygen blast to molten iron in described step c, oxygen rifle controls 500 ~ 1000mm above molten iron level; More preferably control at 700 ~ 1000mm.
Preferably, in b step, the joining day of the oxide compound of iron is in 2 ~ 2.5min of starting of stir process.
Further, as most preferably scheme, the method for the present invention's vanadium extraction from vanadium-bearing hot metal, comprises the steps:
A, carry out stir process to vanadium-bearing hot metal, stirring velocity is 150r/min, and stirring-head immersion depth is 800mm, churning time 30min;
B, when the 2min that a step stir process starts, add the oxide compound of iron in molten iron, add-on is 50kg/tFe;
C, add iron in b step oxide compound after, adopt Self comsuming Single Hole Oxygen Lance to carry out oxygen blast to molten iron, oxygen rifle controls 1000mm above molten iron level, and oxygen pressure is 0.35MPa, and oxygen flow is 500Nm
3;
D, stirring claw vanadium slag after terminating, and obtain half steel.
Beneficial effect of the present invention:
1, the present invention to extract in the method for vanadium slag a step and adopts mechanical mixing method to carry out vanadium extraction from vanadium-bearing hot metal, b step adds the oxide compound of iron, step c coordinates carries out oxygen blast, the oxidation ratio that can reduce refrigerant consumption, improve the oxidation ratio of vanadium, reduce carbon, the utilization and the vanadium extraction production cost that are conducive to resource reduce.
2, the method for vanadium-bearing hot metal vanadium extraction of the present invention is compared with vanadium extraction by converter blowing, can reduce flow of oxygen.
3, the present invention extracts the method for the method employing mechanical mixing method+ferriferous oxide+blowing oxygen of vanadium slag from vanadium-bearing hot metal, still belongs to precedent.
Embodiment
The present invention extracts the method for vanadium slag from vanadium-bearing hot metal, comprises the steps:
A, carry out stir process to vanadium-bearing hot metal, stirring velocity is 50 ~ 150r/min, and stirring-head immersion depth is 200 ~ 800mm, churning time 20 ~ 40min;
B, in the 3min that a step stir process starts, add the oxide compound of iron in molten iron, add-on is 10 ~ 50kg/tFe;
C, add iron in b step oxide compound after, carry out oxygen blast to molten iron, oxygen pressure is between 0.2 ~ 0.5MPa, and oxygen flow is 200 ~ 500Nm
3between;
D, stirring claw vanadium slag after terminating, and obtain half steel.
Wherein, the stirring-head stirred in a step stirring-head preferably used with KR desulfurization is identical.Stirring velocity is preferably 120 ~ 150r/min, and stirring-head immersion depth is 500 ~ 800mm, churning time 30 ~ 40min.
In b step, ferriferous oxide pulvis winding-up amount is 10 ~ 50kg/tFe, refers to that molten iron per ton uses the ferriferous oxide of 10 ~ 50kg.Add ferriferous oxide in b step and can improve molten iron oxygen gesture, oxidation slagging is carried out to elements such as vanadium.Further, preferably, in described b step, ferriferous oxide can adopt the medium composition of one or more containing ferriferous oxide of powdered iron ore, iron scale, iron oxide red.The oxide addition of iron is preferably 30 ~ 50kg/tFe.
Wherein, described in b step in the 3min that a step stir process starts, refer to that stirring-head immerses molten iron and starts in 3min that stir process rises.
Step c injecting oxygen is the calorific value element such as silicon, manganese, carbon in order to be oxidized in molten iron, ensures that molten iron temperature can not drop to very low, to ensure that treating processes is carried out smoothly in treating processes.Preferably, adopt Self comsuming Single Hole Oxygen Lance to carry out oxygen blast to molten iron in step c, oxygen rifle controls 500 ~ 1000mm above molten iron level, and oxygen rifle position is in the middle of stirring-head center and molten iron tank skin.Preferably, oxygen rifle controls 700 ~ 1000mm above molten iron level.
Further, preferably, in b step, the joining day of the oxide compound of iron immerses molten iron at stirring-head and starts in 2 ~ 2.5min that stir process rises.
Further, as most preferably scheme, the method for the present invention's vanadium extraction from vanadium-bearing hot metal, comprises the steps:
A, carry out stir process to vanadium-bearing hot metal, stirring velocity is 150r/min, and stirring-head immersion depth is 800mm, churning time 30min;
B, when the 2min that a step stir process starts, add the oxide compound of iron in molten iron, add-on is 50kg/tFe;
C, add iron in b step oxide compound after, adopt Self comsuming Single Hole Oxygen Lance to carry out oxygen blast to molten iron, oxygen rifle controls 1000mm above molten iron level, and oxygen pressure is 0.35MPa, and oxygen flow is 500Nm
3;
D, stirring claw vanadium slag after terminating, and obtain half steel.
Below in conjunction with embodiment, the specific embodiment of the present invention is further described, does not therefore limit the present invention among described scope of embodiments.
Embodiment 1 adopts the inventive method to extract vanadium slag from vanadium-bearing hot metal
After 80t hot metal ladle enters process station, immersed by stirring-head in molten iron, immersion depth controls at 200mm, and stirring-head stirring velocity controls at 50r/min; Immerse molten iron at stirring-head and start to add iron scale 10kg/tFe in the 3min that stir process rises; Oxygen rifle controls 500mm above molten iron level, and oxygen pressure controls between 0.5MPa, and oxygen flux control is at 200Nm
3; Churning time controls to pull vanadium slag out after 20 min, realizes slag gold and is separated.
After testing, molten iron vanadium drops to 0.03% from 0.15%, and oxidation of coal rate is 6.2%.
Embodiment 2 adopts the inventive method to extract vanadium slag from vanadium-bearing hot metal
After 200t iron ladle enters process station, immersed by stirring-head in molten iron, immersion depth controls between 800mm, and stirring-head stirring velocity controls at 150r/min; Immerse molten iron at stirring-head and start the 2min that stir process rises and add powdered iron ore and iron scale, add overall control at 50kg/tFe; Oxygen rifle controls 1000mm above molten iron level, and oxygen pressure controls between 0.35MPa, and oxygen flux control is at 500Nm
3; Churning time controls at 30min, stirs after terminating and claws vanadium slag, realizes slag gold and is separated.
After testing, molten iron vanadium drops to 0.04% from 0.39%, and oxidation of coal rate is 8.9%.
Embodiment 3 adopts the inventive method to extract vanadium slag from vanadium-bearing hot metal
After 140t iron ladle enters process station, immersed by stirring-head in molten iron, immersion depth controls between 500mm, and stirring-head stirring velocity controls at 120r/min; Immerse molten iron at stirring-head and start the 2.5min that stir process rises and add iron oxide red and powdered iron ore, add-on controls at 30kg/tFe; Oxygen rifle controls 700mm above molten iron level, and oxygen pressure controls between 0.2MPa, and oxygen flux control is at 400Nm
3; Churning time controls at 40min, stirs after terminating and claws vanadium slag, realizes slag gold and is separated.
After testing, molten iron vanadium drops to 0.045% from 0.296%, and oxidation of coal rate is 9.3%.
Claims (7)
1. from vanadium-bearing hot metal, extract the method for vanadium slag, it is characterized in that, comprise the steps:
A, carry out stir process to vanadium-bearing hot metal, stirring velocity is 50 ~ 150r/min, and stirring-head immersion depth is 200 ~ 800mm, churning time 20 ~ 40min;
B, in the 3min that a step stir process starts, add the oxide compound of iron in molten iron, add-on is 10 ~ 50kg/tFe;
C, add iron in b step oxide compound after, carry out oxygen blast to molten iron, oxygen pressure is between 0.2 ~ 0.5MPa, and oxygen flow is 200 ~ 500Nm
3between;
D, stirring claw vanadium slag after terminating, and obtain half steel.
2. the method extracting vanadium slag from vanadium-bearing hot metal according to claim 1, is characterized in that: in described a step, and stirring velocity is 120 ~ 150r/min, and stirring-head immersion depth is 500 ~ 800mm, churning time 30 ~ 40min.
3. the method extracting vanadium slag from vanadium-bearing hot metal according to claim 1 and 2, is characterized in that: in described b step, and the oxide addition of iron is 30 ~ 50kg/tFe.
4. the method extracting vanadium slag from vanadium-bearing hot metal according to any one of claims 1 to 3, is characterized in that: adopt Self comsuming Single Hole Oxygen Lance to carry out oxygen blast to molten iron in described step c, oxygen rifle controls 500 ~ 1000mm above molten iron level.
5. the method extracting vanadium slag from vanadium-bearing hot metal according to claim 4, is characterized in that: oxygen rifle controls 700 ~ 1000mm above molten iron level.
6. the method extracting vanadium slag from vanadium-bearing hot metal according to any one of Claims 1 to 5, is characterized in that: in b step, the joining day of the oxide compound of iron is in 2 ~ 2.5min of starting of stir process.
7. the method for vanadium extraction from vanadium-bearing hot metal according to claim 6, is characterized in that, comprise the steps:
A, carry out stir process to vanadium-bearing hot metal, stirring velocity is 150r/min, and stirring-head immersion depth is 800mm, churning time 30min;
B, when the 2min that a step stir process starts, add the oxide compound of iron in molten iron, add-on is 50kg/tFe;
C, add iron in b step oxide compound after, adopt Self comsuming Single Hole Oxygen Lance to carry out oxygen blast to molten iron, oxygen rifle controls 1000mm above molten iron level, and oxygen pressure is 0.35MPa, and oxygen flow is 500Nm
3;
D, stirring claw vanadium slag after terminating, and obtain half steel.
Priority Applications (1)
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| CN201510005929.8A CN104498657A (en) | 2015-01-07 | 2015-01-07 | Method for extracting vanadium slag from vanadium-containing molten iron |
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| CN201510005929.8A CN104498657A (en) | 2015-01-07 | 2015-01-07 | Method for extracting vanadium slag from vanadium-containing molten iron |
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| CN104498657A true CN104498657A (en) | 2015-04-08 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101328523A (en) * | 2008-07-22 | 2008-12-24 | 攀钢集团攀枝花钢铁研究院有限公司 | Ladle top-bottom blowing vanadium extracting method |
| CN101407852A (en) * | 2008-11-11 | 2009-04-15 | 攀钢集团研究院有限公司 | Method for extracting vanadium slag from ultra-low vanadium-containing molten iron by using converter |
| CN103525978A (en) * | 2013-10-14 | 2014-01-22 | 攀钢集团攀枝花钢铁研究院有限公司 | Semisteel pretreatment powder and preparation method thereof, and smelting method of vanadium-containing molten iron |
| CN103966382A (en) * | 2014-04-24 | 2014-08-06 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for treating vanadium containing molten iron and method for smelting vanadium-titanium magnetite concentrate |
-
2015
- 2015-01-07 CN CN201510005929.8A patent/CN104498657A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101328523A (en) * | 2008-07-22 | 2008-12-24 | 攀钢集团攀枝花钢铁研究院有限公司 | Ladle top-bottom blowing vanadium extracting method |
| CN101407852A (en) * | 2008-11-11 | 2009-04-15 | 攀钢集团研究院有限公司 | Method for extracting vanadium slag from ultra-low vanadium-containing molten iron by using converter |
| CN103525978A (en) * | 2013-10-14 | 2014-01-22 | 攀钢集团攀枝花钢铁研究院有限公司 | Semisteel pretreatment powder and preparation method thereof, and smelting method of vanadium-containing molten iron |
| CN103966382A (en) * | 2014-04-24 | 2014-08-06 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for treating vanadium containing molten iron and method for smelting vanadium-titanium magnetite concentrate |
Non-Patent Citations (1)
| Title |
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| 刘纯厚等: "钠盐搅拌法处理含钒铁水时各元素的行为", 《过程工程学报》 * |
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Application publication date: 20150408 |