CN108359818A - Converter segmented supplies extraction vanadium method - Google Patents
Converter segmented supplies extraction vanadium method Download PDFInfo
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- CN108359818A CN108359818A CN201810338807.4A CN201810338807A CN108359818A CN 108359818 A CN108359818 A CN 108359818A CN 201810338807 A CN201810338807 A CN 201810338807A CN 108359818 A CN108359818 A CN 108359818A
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- 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
-
- 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
- C21C5/32—Blowing from above
-
- 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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
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- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention discloses a kind of converter segmenteds to supply extraction vanadium method, belongs to field of iron and steel smelting.The present invention is to solve the problem that coolant dosage in steel mill vanadium extraction manufacture process is big, of high cost, and oxidation of coal rate is high and vanadium oxygenation efficiency is low, provides a kind of novel converter extraction vanadium method, this approach includes the following steps：It after vanadium-bearing hot metal enters converter, is blown by oxygen rifle blowing gas, oxygen lance position is constant when blowing；It is blown to 2.5~3.0min of blowing using oxygen since blowing；Then it is blown using nitrogen, duration of blast is 2.0~3.0min；Then it is blown again using oxygen, duration of blast is 2.0~2.5min, obtains vanadium slag and half steel.The method of the present invention can substantially reduce vanadium-raising cooling agent dosage, improve vanadium oxygenation efficiency, reduce carbon oxygenation efficiency, be conducive to resource make full use of and vanadium extraction production cost reduce.
Description
Technical field
The invention belongs to field of iron and steel smelting, and in particular to a kind of converter segmented gas supply extraction vanadium method.
Background technology
China is vanadium titano-magnetite big country, and climbing steel, Cheng Gang, elder brother's steel, Wei Gangdeng enterprises all is carried out using vanadium titano-magnetite
It smelts, the molten iron that vanadium titano-magnetite blast furnace process goes out content of vanadium compared with common molten iron is high, and vanadium is a kind of important resource, because
Necessary vanadium extraction, produces vanadium slag before this molten iron-steelmaking.Currently, the production method for producing vanadium slag both at home and abroad is more, mainly there is New Zealand
Ladle blows vanadium technique, South Africa shaking ladle process for extracting vanadium, Russia and the vanadium extraction by converter blowing technique etc. of China, and other process for extracting vanadium also wrap
Include v-bearing steel slag vanadium extraction, process for extracting vanadium from stone coal etc..Wherein optimal with vanadium extraction by converter blowing technique, technical-economic index is best.
The production process system of domestic and international vanadium extraction by converter blowing is constantly changing for addition coolant+process temperature+duration of blast
Into.Vanadium extraction from hot metal is a selective oxidation technology.It is an exothermic process, [Si], [Mn], [V], [C] that converter, which supplies vanadium extraction,
Equal element oxides make molten bath be rapidly heated, and [Si], [Mn] oxidation are happened at before [V] oxidation, and vanadium extraction can not possibly inhibit it anti-
It answers, and [C], [V] conversion temperature be about at 1385 DEG C or so, therefore to obtain the high oxidation rate and [V] yield of [V], it is necessary to add
Enter vanadium-raising cooling agent, control bath temperature is allowed to approach [C], [V] conversion temperature, achievees the purpose that carbon is protected in vanadium extraction, [V] is down to
0.05% or less.The terminal half steel temperature of vanadium extraction is unsuitable excessively high, aoxidized with vanadium vanadium extracting process early period based on, the later stage is reduced to vanadium
It is main, but it is based on vanadium reduction to blow vanadium process.So making molten iron temperature drop to suitably using addition coolant in cooling
Range aoxidizes the vanadium in half steel by the control of duration of blast and process temperature in converter smelting, improves recovery rate.
CN1789435 discloses a kind of vanadium extraction from hot metal control calcium coolant and vanadium extraction from hot metal control calcium technique, vanadium-raising cooling agent
Chemical composition (Wt%) be：Iron scale 56-60%, fine iron breeze 30-40%, bonding agent 5-10%, the coolant can increase
The recovery rate and v slag grade of high vanadium stablize vanadium slag calcium oxide content；It is only optimized from vanadium-raising cooling agent ingredient, for blowing
The optimization of training of qi body without reference to.CN101338351 discloses a kind of vanadium-raising cooling agent and preparation method thereof and application method, should
Coolant is produced using iron scale or vanadium extraction sludge, concentrate containing vanadium iron, bonding agent as raw material, the iron oxidation containing 80%-95%
Object, the SiO of 3-6%2, 0.1-0.6% V2O5, 1-3%MgCl2；It equally pertains only to the composition adjustment of vanadium-raising cooling agent, right
In blowing gas adjustment without reference to.CN 103924027B disclose a kind of vanadium extraction method for making steel, and this method includes blowing vanadium extraction
Process goes out half steel process and exothermic mixture addition process；In the vanadium extraction process that blows, rifle is become using constant pressure and is operated, in oxygen rifle and molten iron
Surface distance H and time relationship are as follows：Blowing starts to blowing 1.5min, H=1.8m~2.0m；Blowing 1.5min is tied to blowing
40s before beam, H=1.6m~1.8m, 40s is to finishing blowing, H=1.3m~1.6m before finishing blowing；Vanadium extraction stove is 70 tons of converters
When, oxygen rifle uses 3 hole Lavalle oxygen rifles, oxygen flow to be set as 13000Nm3/ h, oxygen pressure are 0.75-0.80Mpa；Vanadium extraction stove is
When 120 tons of converters, it is 30.3mm that oxygen rifle, which uses 4 hole Lavalle oxygen rifles, oxygen rifle throat diameter, and oxygen flow is set as
16000Nm3/ h, oxygen pressure are 0.80-0.85Mpa；Exothermic mixture is added in process, will when 1/3 half steel of vanadium extraction stove enters ladle
Ladle is added in exothermic mixture, and exothermic mixture is quartz sand, and exothermic mixture addition is 400~800kg/ stoves；It is only adopted in vanadium extracting process
Become rifle position control with constant pressure, does not refer to the method for being blown into gas in different smelting stage control differences.The prior art is most
It is only adjusted on coolant or rifle position, does not pay close attention to the research of blowing gas very important to temperature control.
Invention content
The technical problem to be solved by the present invention is to for solve coolant dosage in steel mill vanadium extraction manufacture process it is big, at
This height, the problem that oxidation of coal rate is high and vanadium oxygenation efficiency is low, provides a kind of novel converter extraction vanadium method.
The present invention solves technological means used by above-mentioned technical problem, and there is provided a kind of converter segmenteds to supply vanadium extraction
Method, this approach includes the following steps：
A, it after vanadium-bearing hot metal enters converter, is blown by oxygen rifle blowing gas, oxygen lance position is invariable when blowing；
B, converting process is divided into three phases, to the 2.5~3.0min that blows for the first stage since blowing, the first stage
It is blown using oxygen；
C, the first stage terminates, and continues 2.0~3.0min of blowing, this process is second stage, and second stage uses nitrogen
It blows；
D, second stage terminates, and continues 2.0~2.5min of blowing, this process is the phase III, and the phase III uses oxygen
It blows；
E, the phase III terminates, and obtains vanadium slag and half steel.
Wherein, in converter segmented gas supply extraction vanadium method described above, in step a, the oxygen lance position is 1.7~
2.0m。
Wherein, in converter segmented described above gas supply extraction vanadium method, in step b, oxygen described in the first stage
Pressure is 0.70~0.85MPa, and air supply intensity is 3.2~4.0m3/ (mint vanadium-bearing hot metals).
Wherein, in converter segmented described above gas supply extraction vanadium method, in step b, coolant terminates in the first stage
It is added when preceding 0.5~1.0min.
Wherein, in converter segmented described above gas supply extraction vanadium method, in step b, the dosage of the coolant does not surpass
Cross 20kg/t vanadium-bearing hot metals.
Wherein, in converter segmented gas supply extraction vanadium method described above, in step b, the coolant be containing iron and
The low-phosphorous material of low-sulfur of ferriferous oxide, TFe in ingredient>50%.
Preferably, in converter segmented gas supply extraction vanadium method described above, in step b, the coolant be pig,
At least one of iron scale or ore.
Wherein, in converter segmented described above gas supply extraction vanadium method, in step c, nitrogen described in second stage
Pressure is 0.75~0.90MPa, and air supply intensity is 2.5~3.5m3/ (mint vanadium-bearing hot metals).
Wherein, in converter segmented described above gas supply extraction vanadium method, in step d, oxygen described in the phase III
Pressure is 0.70~0.85MPa, and air supply intensity is 3.2~4.0m3/ (mint vanadium-bearing hot metals).
Wherein, in converter segmented gas supply extraction vanadium method described above, the converter be top-bottom blowing vanadium extracting converter or
Top blown oxygen converter.
Wherein, non-when converter is top-bottom blowing vanadium extracting converter in converter segmented described above gas supply extraction vanadium method
It is 0.001~0.003m that bottom blown gas air supply intensity is controlled during blowing3/ (mint vanadium-bearing hot metals), bottom is controlled during blowing
Blowing air supply intensity is 0.35~0.65m3/ (mint vanadium-bearing hot metals)；The bottom blown gas is all nitrogen.
The beneficial effects of the invention are as follows：
The method of the present invention will be divided into three phases during blowing, by controlling the type of blowing gas in three phases, pressure
Power and flow, and control the duration of blast in each stage, can substantially reduce vanadium-raising cooling agent dosage, the oxygenation efficiency for improving vanadium,
Reduce carbon oxygenation efficiency, be conducive to resource make full use of and vanadium extraction production cost reduce.
Specific implementation mode
Specifically, a kind of converter segmented supplies extraction vanadium method, include the following steps：
A, it after vanadium-bearing hot metal enters converter, is blown by oxygen rifle blowing gas, oxygen lance position is invariable when blowing；
B, converting process is divided into three phases, to the 2.5~3.0min that blows for the first stage since blowing, the first stage
It is blown using oxygen；
C, the first stage terminates, and continues 2.0~3.0min of blowing, this process is second stage, and second stage uses nitrogen
It blows；
D, second stage terminates, and continues 2.0~2.5min of blowing, this process is the phase III, and the phase III uses oxygen
It blows；
E, the phase III terminates, and obtains vanadium slag and half steel.
Rifle position uses same rifle position, rifle position control using permanent rifle position scheme control during blowing when oxygen rifle gas supply of the present invention
System is apart from 1.7~2.0m of metal bath surface.
In original vanadium extraction by converter blowing technique, the oxidizing atmosphere in stove is controlled by adjusting rifle position in air blowing process, together
When be added coolant control temperature, ensure the vanadium in suitable temperature range internal oxidition molten iron；But in the process in stove
Oxidizing atmosphere is still higher so that the FeO contents in slag are higher, and temperature control fluctuation is larger so that vanadium extracting process carbon is burnt
Damage is very big.
The method of the present invention combination vanadium extraction by converter blowing temperature-rise period and reaction rule, for oxygen blast vanadium extraction technology in temperature liter early period
Very fast feature at high speed will be divided into three phases during blowing：First stage is that blowing starts to 2.5~3.0min of blowing,
The pressure that period controls oxygen is 0.70~0.85MPa, and air supply intensity is 3.2~4.0m3/ (mint vanadium-bearing hot metals), and
Coolant is added in 0.5~1.0min before terminating in the first stage, ensures have after being added>The mixing time of 30s is used in early period
Pure oxygen blows, and most of vanadium is aoxidized, coolant melts；First stage terminates, and second stage uses nitrogen
It blows, the pressure for controlling nitrogen is 0.75~0.90MPa, and air supply intensity is 2.5~3.5m3/ (mint vanadium-bearing hot metals),
Duration of blast be 2.0~3.0min, blowing stirring is carried out using pure nitrogen gas in mid-term, avoid oxygen continue to carbon in molten iron with
The oxidation of iron can effectively control in-furnace temperature, while the FeO in slag can continue to aoxidize the vanadium in molten iron, improve the oxidation of vanadium
Rate；Second stage terminates, and the phase III is blown using oxygen, and the pressure for controlling oxygen is 0.70~0.85MPa, and gas supply is strong
Degree is 3.2~4.0m3/ (mint vanadium-bearing hot metals), duration of blast are 2.0~2.5min, and the later stage is blown using pure oxygen, are protected
The separation for having demonstrate,proved slag iron in converter is heated up by pure oxygen blast, effectively reduces the consumption of iron and steel stock.
The method of the present invention is in order to ensure that the ferriferous oxide in coolant can be aoxidized in nitrogen flushing whipping process in molten iron
Vanadium, it is desirable that 0.5~1.0min before terminating in the first stage is added, so both can be warm in the most fast beforehand control stove that heats up
Degree is at 1320 DEG C or so, in favor of reducing the scaling loss of carbon, while the fusing for thering is certain time to promote coolant, ensure Blowing Nitrogen Process
Impeller in slurry pump carry out；Common coolant in the art can be used in heretofore described vanadium-raising cooling agent, and vanadium-raising cooling agent is
TFe>At least one of 50% low-sulfur containing iron and ferriferous oxide low-phosphorous material, such as pig, iron scale, ore etc.
All may be used；The nitrogen that the method for the present invention mid-term is blown into belongs to inert gas, will not only aoxidize molten iron heating, but also can take away stove
Interior temperature, therefore it can be significantly reduced the dosage of vanadium-raising cooling agent, the addition of the vanadium-raising cooling agent is no more than 20g/t
Vanadium-bearing hot metal.
The method of the present invention is especially suitable for top-bottom blowing vanadium extracting converter or top blown oxygen converter；When converter carries for top and bottom complex blowing
It is 0.001~0.003m that bottom blown gas air supply intensity is controlled when vanadium converter, during non-blowing3/ (mint vanadium-bearing hot metals), it is non-to blow
The refining stage reduces bottom blowing, and it is excessive to can avoid temperature drop in stove；It is 0.35~0.65m that bottom blown gas air supply intensity is controlled during blowing3/
(mint vanadium-bearing hot metals) increases flow bottom blowing, bottom blowing stirring ability can be improved during blowing；The bottom blown gas is all nitrogen
Gas；It is half steel to the free time between blowing next time during non-blowing.
Below by embodiment, invention is further described in detail, but does not therefore limit the scope of the present invention
Among the embodiment described range.
Embodiment 1
Use rifle position constant after molten iron enters 200t combined blown converters, during blowing to be blown apart from metal bath surface 1.7m
Refining；Converting process is divided into three phases, and the first stage is blown using purity oxygen, and oxygen pressure control is in 0.70MPa, gas supply
Strength control is in 3.2m3/ (mint vanadium-bearing hot metals), duration of blast 3.0min, coolant are added when blowing 2.5min, add
It is 17kg/t vanadium-bearing hot metals to enter amount；First stage terminates, and second stage is blown using nitrogen, and nitrogen pressure control exists
0.90MPa, air supply intensity are controlled in 3.5m3/ (mint vanadium-bearing hot metals), duration of blast 2.0min；Second stage terminates, the
Three stages were blown using purity oxygen, and oxygen pressure control is controlled in 0.85MPa, air supply intensity in 4.0m3/ (mint contains
Vanadium-containing molten iron), duration of blast 2.5min；Non- blowing stage Bottom Blowing Gas Flow Rate control is in 0.001m3/ (mint contains vanadium iron
Water), 0.5m is used during blowing3/ (mint vanadium-bearing hot metals) is controlled, and bottom blown gas is nitrogen；Phase III terminates, and obtains
Vanadium slag and half steel, after testing, molten iron vanadium oxygenation efficiency have reached 92.32%, and oxidation of coal rate is 11.34%.
Embodiment 2
After molten iron enters 200t converters, Gas injection is carried out using top blow oxygen lance, rifle position constant control is apart from molten metal
Face 2.0m；Converting process is divided into three phases, and the first stage is blown using purity oxygen, and oxygen pressure is controlled in 0.85MPa,
Air supply intensity is controlled in 4.0m3/ (mint vanadium-bearing hot metals), duration of blast 2.5min, coolant add when blowing 2.0min
Enter, addition is 18kg/t vanadium-bearing hot metals；First stage terminates, and second stage is blown using nitrogen, nitrogen pressure control
In 0.75MPa, air supply intensity is controlled in 2.5m3/ (mint vanadium-bearing hot metals), duration of blast 3.0min；Second stage terminates,
Phase III is blown using purity oxygen, and oxygen pressure control is controlled in 0.70MPa, air supply intensity in 3.2m3/(min·t
Vanadium-bearing hot metal), duration of blast 2.0min；Phase III terminates, and obtains half steel and vanadium slag, and after testing, molten iron vanadium oxygenation efficiency reaches
91.18%, oxidation of coal rate is 11.23%.
Embodiment 3
After molten iron enters 120t converters, Gas injection is carried out using top blow oxygen lance, rifle position constant control is apart from molten metal
Face 1.9m；Converting process is divided into three phases, and the first stage is blown using purity oxygen, and oxygen pressure is controlled in 0.80MPa,
Air supply intensity is controlled in 3.5m3/ (mint vanadium-bearing hot metals), duration of blast 2.7min, coolant add when blowing 2.0min
Enter, addition is 16kg/t vanadium-bearing hot metals；First stage terminates, and second stage is blown using nitrogen, nitrogen pressure control
In 0.80MPa, air supply intensity is controlled in 2.6m3/ (mint vanadium-bearing hot metals), duration of blast 2.5min；Second stage terminates,
Phase III is blown using purity oxygen, and oxygen pressure control is controlled in 0.8MPa, air supply intensity in 3.8m3/ (mint contains
Vanadium-containing molten iron), duration of blast 2.2min；Phase III terminates, and obtains half steel and vanadium slag, and after testing, molten iron vanadium oxygenation efficiency is
94.16%, oxidation of coal rate is 13.73%.
Comparative example 1
After molten iron enters 200t converters, using oxygen rifle injecting oxygen；Rifle position uses " high-low-high " pattern when oxygen rifle supplies
It is controlled, i.e. Primary period 1min uses 1.9m rifle positions (height of nozzle and liquid level), mid-term to use the low rifle positions of 1.6m, blowing
1.5min uses 1.9m high rifle positions, air supply intensity to control in 2.0m before terminating3/ (mint vanadium-bearing hot metals)；It is used during blowing
0.2m3The air supply intensity of/(mint vanadium-bearing hot metals) carries out bottom blowing nitrogen control；Vanadium-raising cooling agent 2.5min before blowing adds
Complete, addition is in 32g/t vanadium-bearing hot metals.Molten iron vanadium oxygenation efficiency is 84.36%, and oxidation of coal rate is 15.71%.
Comparative example 2
After molten iron enters 120t converters, using oxygen rifle injecting oxygen；Rifle position uses " high-low-high " pattern when oxygen rifle supplies
It is controlled, i.e. Primary period 1.5min uses 1.8m rifle positions (height of nozzle and liquid level), mid-term to use the low rifle positions of 1.5m, blow
1min uses 1.8m high rifle positions, air supply intensity to control in 1.8m before refining terminates3/ (mint vanadium-bearing hot metals)；It is used during blowing
0.25m3The air supply intensity of/(mint vanadium-bearing hot metals) carries out bottom blowing nitrogen control；Vanadium-raising cooling agent 3min before blowing is added,
Addition is in 28g/t vanadium-bearing hot metals.Molten iron vanadium oxygenation efficiency is 83.47%, and oxidation of coal rate is 16.18%.
By Examples 1 to 3, comparative example 1~2 it is found that the method for the present invention passes through the injection gas to three phases during blowing
The control of the type, pressure and flow of body, and the duration of blast in each stage is controlled, vanadium-raising cooling agent use can be substantially reduced
Amount, improve vanadium oxygenation efficiency, reduce carbon oxygenation efficiency, realize resource make full use of and the reduction of vanadium extraction production cost.
Claims (10)
1. converter segmented supplies extraction vanadium method, it is characterised in that：Include the following steps：
A, it after vanadium-bearing hot metal enters converter, is blown by oxygen rifle blowing gas, oxygen lance position is invariable when blowing；
B, converting process is divided into three phases, and to the 2.5~3.0min that blows for the first stage since blowing, the first stage uses
Oxygen blows；
C, the first stage terminates, and continues 2.0~3.0min of blowing, this process is second stage, and second stage is carried out using nitrogen
Blowing；
D, second stage terminates, and continues 2.0~2.5min of blowing, this process is the phase III, and the phase III is carried out using oxygen
Blowing；
E, the phase III terminates, and obtains vanadium slag and half steel.
2. converter segmented according to claim 1 supplies extraction vanadium method, it is characterised in that：In step a, the oxygen rifle rifle
Position is 1.7~2.0m.
3. converter segmented according to claim 1 supplies extraction vanadium method, it is characterised in that：In step b, in the first stage
The pressure of the oxygen is 0.70~0.85MPa, and air supply intensity is 3.2~4.0m3/ (mint vanadium-bearing hot metals).
4. supplying extraction vanadium method according to claims 1 to 3 any one of them converter segmented, it is characterised in that：In step b,
Coolant terminate in the first stage before 0.5~1.0min when be added.
5. converter segmented according to claim 4 supplies extraction vanadium method, it is characterised in that：In step b, the coolant
Dosage be no more than 20kg/t vanadium-bearing hot metals.
6. converter segmented according to claim 4 or 5 supplies extraction vanadium method, it is characterised in that：It is described cold in step b
But agent is the low-phosphorous material of the low-sulfur containing iron and ferriferous oxide, TFe in ingredient>50%；Preferably, the coolant is the pig iron
At least one of block, iron scale or ore.
7. converter segmented according to claim 1 supplies extraction vanadium method, it is characterised in that：In step c, in second stage
The pressure of the nitrogen is 0.75~0.90MPa, and air supply intensity is 2.5~3.5m3/ (mint vanadium-bearing hot metals).
8. converter segmented according to claim 1 supplies extraction vanadium method, it is characterised in that：In step d, in the phase III
The pressure of the oxygen is 0.70~0.85MPa, and air supply intensity is 3.2~4.0m3/ (mint vanadium-bearing hot metals).
9. supplying extraction vanadium method according to claim 1~8 any one of them converter segmented, it is characterised in that：The converter
For top-bottom blowing vanadium extracting converter or top blown oxygen converter.
10. converter segmented according to claim 9 supplies extraction vanadium method, it is characterised in that：When converter is top and bottom complex blowing
It is 0.001~0.003m that bottom blown gas air supply intensity is controlled when converter extracting vanadium, during non-blowing3/ (mint vanadium-bearing hot metals), blows
It is 0.35~0.65m that bottom blown gas air supply intensity is controlled during refining3/ (mint vanadium-bearing hot metals)；The bottom blown gas is all nitrogen
Gas.
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| CN201810338807.4A CN108359818A (en) | 2018-04-16 | 2018-04-16 | Converter segmented supplies extraction vanadium method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115261552A (en) * | 2022-07-08 | 2022-11-01 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for extracting vanadium from high-temperature molten iron by converter |
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