CN107190122A - Dephosphorization device and dephosphorization method for refining rotary blowing - Google Patents
Dephosphorization device and dephosphorization method for refining rotary blowing Download PDFInfo
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- CN107190122A CN107190122A CN201710269751.7A CN201710269751A CN107190122A CN 107190122 A CN107190122 A CN 107190122A CN 201710269751 A CN201710269751 A CN 201710269751A CN 107190122 A CN107190122 A CN 107190122A
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- dephosphorization
- head
- rotary blowing
- molten steel
- refining
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- 238000007664 blowing Methods 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 42
- 238000007670 refining Methods 0.000 title claims abstract description 35
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 86
- 239000010959 steel Substances 0.000 claims abstract description 86
- 239000007788 liquid Substances 0.000 claims abstract description 26
- 238000002347 injection Methods 0.000 claims description 21
- 239000007924 injection Substances 0.000 claims description 21
- 229910052698 phosphorus Inorganic materials 0.000 claims description 18
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 17
- 239000012159 carrier gas Substances 0.000 claims description 17
- 239000011574 phosphorus Substances 0.000 claims description 17
- 238000010079 rubber tapping Methods 0.000 claims description 14
- 239000007789 gas Substances 0.000 claims description 7
- 229910001634 calcium fluoride Inorganic materials 0.000 claims description 6
- 230000004907 flux Effects 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- 239000000725 suspension Substances 0.000 claims description 6
- 230000007423 decrease Effects 0.000 claims description 5
- 239000006199 nebulizer Substances 0.000 claims description 5
- 239000007921 spray Substances 0.000 claims description 4
- 239000011819 refractory material Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 9
- 239000000843 powder Substances 0.000 abstract description 9
- 238000006243 chemical reaction Methods 0.000 abstract description 2
- 230000014759 maintenance of location Effects 0.000 abstract 1
- 230000001737 promoting effect Effects 0.000 abstract 1
- 238000005507 spraying Methods 0.000 abstract 1
- 239000003795 chemical substances by application Substances 0.000 description 19
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 10
- 238000012545 processing Methods 0.000 description 10
- 239000002893 slag Substances 0.000 description 6
- 229910052742 iron Inorganic materials 0.000 description 5
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 238000003723 Smelting Methods 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 4
- 238000007667 floating Methods 0.000 description 4
- BHEPBYXIRTUNPN-UHFFFAOYSA-N hydridophosphorus(.) (triplet) Chemical compound [PH] BHEPBYXIRTUNPN-UHFFFAOYSA-N 0.000 description 4
- 239000000428 dust Substances 0.000 description 3
- 238000003780 insertion Methods 0.000 description 3
- 230000037431 insertion Effects 0.000 description 3
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 2
- 235000011941 Tilia x europaea Nutrition 0.000 description 2
- 229910052786 argon Inorganic materials 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000004571 lime Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 229910001208 Crucible steel Inorganic materials 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 208000037656 Respiratory Sounds Diseases 0.000 description 1
- 241001062472 Stokellia anisodon Species 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000010436 fluorite Substances 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000009865 steel metallurgy Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- 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
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/064—Dephosphorising; Desulfurising
-
- 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
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/064—Dephosphorising; Desulfurising
- C21C7/0645—Agents used for dephosphorising or desulfurising
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention discloses a refining rotary blowing dephosphorization device and a dephosphorization method, wherein dephosphorization powder is conveyed into molten steel, the dephosphorization powder floats to the liquid surface along a spiral line under the combined action of centrifugal force and upper buoyancy along with bubbles, and the bubbles move towards the powder spraying direction area under the action of the centrifugal force, so that the dephosphorization powder is better dispersed in the molten steel, and meanwhile, vortex is formed in the molten steel to slowly rise, thereby increasing the retention time of the dephosphorization powder in the molten steel, promoting the dynamic condition of dephosphorization in the molten steel and improving the utilization rate of the dephosphorization powder. The method is used for molten steel dephosphorization production, realizes short blowing time, effectively controls the dynamic conditions of dephosphorization reaction, ensures that the dephosphorization powder is fully diffused in the molten steel, improves the utilization rate of the powder and reduces the production cost.
Description
Technical field
The present invention relates to field of steel metallurgy, more particularly to a kind of dephosphorization apparatus and dephosphorization method for refining rotary blowing.
Background technology
Purifying is the main trend of modern steel Materials, and clean steel production is the development of modern steel smelting technique
Important directions.The deep process problem of the big impurity element of O, P, S, H tetra-, be always with variety steel production process steel sublimate with
Principal contradiction and obstacle between cost.Conventional treatment means rely primarily on vacuum (RH, VD) and electrode (LF).But the method is set
Standby somewhat expensive, operation and maintenance expense is high, has both made gently to handle a process cost or in 30-60 members/t, especially in market instantly
On the premise of price competition is extremely fierce, upgrading synergy is more important.
Phosphorus is controlled by steel usually as harmful element, because segregation of the phosphorus in steel makes steel tough than more serious
Property degenerate, produce " cold short " phenomenon, especially under cryogenic, it is easier to occur " cold short ", the segregation of phosphorus can also cause steel
Anisotropy, reduction welding performance, the corrosion fatigue for causing stainless steel.With the fast development of science and technology, high-duty cast steel
The metallurgical quality of steel is required to improve constantly, requirements at the higher level are constantly especially proposed to the phosphorus content in steel.Some cryogenic steel,
Marine steel, resistant to hydrogen crackle steel and part steel plate require that phosphorus content is less than 0.01% or even 0.005% in steel；In order to prevent Austria
Family name's body stainless steel produces stress corrosion cracking (SCC), it is desirable to which phosphorus is less than 0.005% in steel.Therefore, steel mill uses " double slags mostly at present
Method " is to take a block converter to be poured into after molten iron smelting half the time using slag making twice or " duplex practice " i.e. in converter smelting
The method for proceeding to smelt into another block converter, the deficiency of both approaches is complex process, and the duration of heat is long, converter
Productivity ratio can not be not fully exerted；Also a kind of mode is progress advance to molten iron " three take off " i.e. desiliconization, desulfurization, dephosphorization, such as
The iron and steel enterprise of Japan, its deficiency is need to be more with equipment, and investment is big, complex procedures, heat waste are greatly and due to the molten iron after " three take off "
Temperature is low, greatly reduces the steel scrap amount added during converter smelting.The shortcoming of dephosphorization solvent is sprinkled into ladle is：Desulphurization
Mass transfer velocity is slow, and the dephosphorization time is long, causes productivity ratio low.
Notification number CN201410093812.5 proposes a kind of method of liquid steel dephosphorization, and this method arrives ladle in molten steel tapping
In, preliminary refining agent is added into ladle, and ar blowing refining is carried out, wherein, the preliminary refining agent includes active lime and fluorite；Will
The molten steel obtained after ar blowing refining carries out RH application of vacuum, wherein, Dephosphorising agent, wherein dephosphorization are added during RH application of vacuum
Agent includes active lime and iron scale, realizes liquid steel dephosphorization.But this method directly adds Dephosphorising agent in molten steel, can cause
Desulphurization mass transfer velocity is slow, and Dephosphorising agent is difficult diffusion in molten steel so that the utilization rate of pulvis is relatively low, and production cost is higher.
The content of the invention
In order to overcome drawbacks described above, the technical problems to be solved by the invention are to provide a kind of dephosphorization for refining rotary blowing
Device and dephosphorization method.
The present invention seeks to what is realized by following technical scheme：
A kind of dephosphorization apparatus for refining rotary blowing, including lowering or hoisting gear, air supply system, charging system, swivel joint, rotation
Rotary device, the horizontal rifle of rotation, T-shaped stirring-head, hollow rotating pipe and framework；The body of a gun of the horizontal rifle of rotation is hollow tube, and pipette tips are T
Shape stirring-head, injection hole, the body of a gun and T-shaped stirring-head parcel refractory material are provided with the both sides of T-shaped stirring-head；The rotating device
Hollow shaft including motor and Qi Nei；Rotate horizontal rifle to be connected with rotating device bottom, the body of a gun is connected by flange with hollow shaft；Rotation
Rotary device top is connected with hollow rotating pipe bottom, and hollow shaft is connected by flange with hollow rotating pipe bottom；Hollow rotating pipe
Top is connected with the bearing in swivel joint；Swivel joint is connected with air supply system and charging system；Swivel joint is consolidated with framework
It is fixed；Rotating device is fixed in framework, and framework upper end is connected with lowering or hoisting gear；Described lowering or hoisting gear includes hoist engine, slided calmly
Wheel, suspension hook, support frame, the guide ring for being arranged on framework side, the guide rod coordinated with guide ring；Hoist engine, fixed pulley, guiding
On bar fixing support rack；Suspension hook is connected by steel wire rope with framework.
The horizontal rifle total length of described rotation is 4500-5000mm, a diameter of 150-200mm of the body of a gun, T-shaped stirring-head length
800-1000mm, a diameter of 300-400mm, a diameter of 10-20mm of injection hole.
The dephosphorization method of rotary blowing is refined, is comprised the following steps：
1) Tapping Temperature of Bof control is at 1550 DEG C~1650 DEG C, and phosphorus mass percent is controlled below 0.02%；
2) rotate horizontal rifle to be begun to decline by standby position by lowering or hoisting gear, while opening air supply system and charging system, open
Begin spray dephosphorization pulvis；
3) the T-shaped stirring-head for rotating horizontal rifle enters below liquid steel level and stops declining after the 0.3-1m of ladle bottom,
Start rotating device and be stepped up rotary speed, T-shaped stirring-head speed setting is 5-300r/min；
4) lifting is started by lowering or hoisting gear after rotary blowing 5-10min and rotates horizontal rifle, rotating the T-shaped stirring-head of horizontal rifle
Propose that rotating speed need to drop to 5-10r/min before liquid steel level, propose liquid steel level above 0.3-0.5m and keep this position again
10-30s is spun up, revolution is 50-80r/min；
5) reduction rotating device revolution closes air supply system and charging system to stopping, and terminates injection, completes rotary blowing
Dephosphorization process.
Described air supply system carrier gas flux 10-60Nm3/ h, nebulizer gas pressure 0.3-1.5MPa, carrier gas is Ar gas；
Described charging system is 5-15kg/t to dephosphorization pulvis conveying capacity；
Described dephosphorization pulvis composition contains mass percent CaO40-80%, FeO10-50%, CaF210-30%, grain
Spend for 0.05-0.1mm.
The dephosphorization apparatus and dephosphorization method of the refining rotary blowing of the present invention, can be used alone progress refining dephosphorization process,
It is also applicable in the processes such as the LF of liquid steel refining, argon station, RH, ANS, VD.
The dephosphorization apparatus and dephosphorization method of the refining rotary blowing of the present invention, dephosphorization pulvis are delivered in molten steel, dephosphorization
Pulvis is floated with collective effect of the bubble by centrifugal force and buoyancy along helix to liquid level, under the action of the centrifugal force, bubble
To pulvis emission direction regional movement, make the more preferable disperse of dephosphorization pulvis in molten steel, while it is slow that vortex is formed in molten steel
Rise, so as to add residence time of the dephosphorization pulvis in molten steel, promote the dynamic conditions of dephosphorization in molten steel, improve de-
The utilization rate of phosphorus powder agent.Liquid steel dephosphorization production is carried out using this method, realizes that the injection time is short, effectively control dephosphorisation reaction is dynamic
Mechanical condition, makes dephosphorization pulvis fully be spread in molten steel, and the utilization rate of pulvis is improved, and reduces production cost.
Brief description of the drawings
Fig. 1 is the dephosphorization apparatus schematic diagram of refining rotary blowing；
Wherein, 1- lowering or hoisting gears；2- air supply systems；3- charging systems；4- swivel joints；5- rotating devices；6- guide rings；
7- rotates horizontal rifle；8- ladles；9-T shape stirring-heads；10- hollow rotating pipes；11- frameworks；12- support frames；13- guide rods.
Embodiment
Illustrated with reference to specific embodiment：
A kind of dephosphorization apparatus for refining rotary blowing, including lowering or hoisting gear 1, air supply system 2, charging system 3, swivel joint
4th, rotating device 5, guide ring 6, rotate horizontal rifle 7, ladle 8, T-shaped stirring-head 9, hollow rotating pipe 10, framework 11, support frame 12,
Guide rod 13；
The body of a gun of the horizontal rifle 7 of rotation is hollow tube, and pipette tips are T-shaped stirring-head, in the both sides of T-shaped stirring-head provided with injection
Hole, the body of a gun and T-shaped stirring-head parcel refractory material；The rotating device 5 includes motor and Qi Nei hollow shaft；Rotate horizontal rifle 7
It is connected with the bottom of rotating device 5, the body of a gun is connected by flange with hollow shaft；The top of rotating device 5 and the bottom of hollow rotating pipe 10
Connection, hollow shaft is connected by flange with the bottom of hollow rotating pipe 10；The top of hollow rotating pipe 10 and the bearing in swivel joint 4
Connection；Swivel joint 4 is connected with air supply system 2 and charging system 3；Swivel joint 4 is fixed with framework 11；Rotating device 5 is fixed
In framework 11, framework 11 is connected with lowering or hoisting gear 1.
Described lowering or hoisting gear 1 includes hoist engine, fixed pulley, suspension hook, support frame 12, the guiding for being arranged on the side of framework 11
Ring 6, the guide rod 13 coordinated with guide ring 6；Hoist engine, fixed pulley, on the fixing support rack 12 of guide rod 13, suspension hook passes through steel wire
Rope is connected with the upper end of framework 11.
Embodiment one：
1. embodiment of the present invention is carried out in the filling of 260t molten steel, for producing ultra-low phosphoretic steel, implement the converter of steel grade
Tapping temperature is 1610 DEG C, and molten steel composition during tapping, phosphorus content is 0.018%, and carbon is controlled below 0.05%, using not taking off
Oxygen, floating plug pushing off the slag processing tapping.
2. ladle is transported into rotary blowing dephosphorization process, essence is carried out to molten steel using the dephosphorization apparatus of refining rotary blowing
Refine dephosphorization treatment.
3. the horizontal rifle total length of the rotation of rotary blowing dephosphorization apparatus is 4500mm, stirring-head length 800mm, stirring-head diameter
For 350mm, a diameter of 10mm of injection hole, a diameter of 180mm of hollow tube, insertion depth for rotate horizontal rifle T-shaped stirring-head bottom away from
Fill 0.5 meter of bottom.
4. use carrier gas injection dephosphorization agent, carrier gas flux 20Nm3/ h, nebulizer gas pressure is 1.2MPa, and carrier gas is Ar.
5. the dephosphorization pulvis main component used contains mass percent CaO70%, FeO15%, CaF210%.Dephosphorising agent
Granularity be 0.07mm, the conveying capacity of Dephosphorising agent is 10kg/t.
6. the dephosphorization step of liquid steel refining rotary blowing is as follows：1) horizontal rifle is rotated to be connected to after work order by standby position
Decline, while opening high-pressure air source and charging system, start to dust.2) horizontal rifle is rotated to enter below liquid steel level apart from ladle
Start rotation after the 0.5m of bottom, be stepped up rotary speed, speed setting is 180r/min.3) injection work reaches and started after 9min
Rifle is carried, below 5r/min need to be dropped to rotating rotating speed before horizontal rifle front end proposes liquid steel level, propose liquid steel level above 0.3m simultaneously
This position is kept to spin up 20s again, revolution is 50r/min.4) reduction rotation revolution terminates injection to stopping, and completes
The dephosphorization process of rotary blowing.
7. it is 0.018% to implement initial phosphorous content before steel grade refining, the finished product phosphorus after the processing of rotary blowing dephosphorization process
Content is 0.0023%, and dephosphorization rate is 87.2%, and temperature drop is 23 DEG C.
Embodiment two：
1. embodiment of the present invention is carried out in the filling of 260t molten steel, for producing ultra-low phosphoretic steel, implement the converter of steel grade
Tapping temperature is 1605 DEG C, and molten steel composition during tapping, phosphorus content is 0.016%%, and carbon is controlled below 0.05%, using not
Deoxidation, floating plug pushing off the slag processing tapping.
2. ladle is transported into rotary blowing dephosphorization process, essence is carried out to molten steel using the dephosphorization apparatus of refining rotary blowing
Refine dephosphorization treatment.
3. the horizontal rifle total length of the rotation of rotary blowing dephosphorization apparatus is 4600mm, stirring-head length 900mm, stirring-head diameter
For 360mm, a diameter of 9mm of injection hole, a diameter of 180mm of hollow tube, insertion depth is the horizontal rifle T-shaped stirring-head bottom of rotation away from tank
0.5 meter of bottom.
4. use carrier gas injection dephosphorization agent, carrier gas flux 20Nm3/ h, nebulizer gas pressure is 1.2MPa, and carrier gas is Ar.
5. the dephosphorization pulvis main component used contains CaO73%, FeO14%, CaF210%.The granularity of Dephosphorising agent is
0.07mm, the conveying capacity of Dephosphorising agent is 10kg/t.
6. the dephosphorization step of liquid steel refining rotary blowing is as follows：1) horizontal rifle is rotated to be connected to after work order by standby position
Decline, while opening high-pressure air source and charging system, start to dust.2) horizontal rifle is rotated to enter below liquid steel level apart from ladle
Start rotation after the 0.5m of bottom, be stepped up rotary speed, speed setting is 70r/min.3) injection work reaches and started after 8min
Rifle is carried, below 5r/min need to be dropped to rotating rotating speed before horizontal rifle front end proposes liquid steel level, propose liquid steel level above 0.3m simultaneously
This position is kept to spin up 20s again, revolution is 50r/min.4) reduction rotation revolution terminates injection to stopping, and completes
The dephosphorization process of rotary blowing.
7. it is 0.016% to implement initial phosphorous content before steel grade refining, the finished product phosphorus after the processing of rotary blowing dephosphorization process
Content is 0.0023%, and dephosphorization rate is 85.6%, and temperature drop is 26 DEG C.
Embodiment three：
1. embodiment of the present invention is carried out in the filling of 260t molten steel, for producing ultra-low phosphoretic steel, implement the converter of steel grade
Tapping temperature is 1615 DEG C, and molten steel composition during tapping, phosphorus content is 0.015%%, and carbon is controlled below 0.05%, using not
Deoxidation, floating plug pushing off the slag processing tapping.
2. ladle is transported into rotary blowing dephosphorization process, essence is carried out to molten steel using the dephosphorization apparatus of refining rotary blowing
Refine dephosphorization treatment.
3. the horizontal rifle total length of the rotation of rotary blowing dephosphorization apparatus is 4800mm, stirring-head length 950mm, stirring-head diameter
For 380mm, a diameter of 9mm of injection hole, a diameter of 190mm of hollow tube, insertion depth is the horizontal rifle T-shaped stirring-head bottom of rotation away from filling
0.5 meter of bottom.
4. use carrier gas injection dephosphorization agent, carrier gas flux 20Nm3/ h, nebulizer gas pressure is 1.2MPa, and carrier gas is Ar.
5. the dephosphorization pulvis main component used contains CaO65%, FeO15%, CaF215%.The granularity of Dephosphorising agent is
0.07mm, the conveying capacity of Dephosphorising agent is 10kg/t.
6. the dephosphorization step of liquid steel refining rotary blowing is as follows：1. the horizontal rifle of rotation is connected to after work order by standby position
Decline, while opening high-pressure air source and charging system, start to dust.2. the horizontal rifle of rotation enters below liquid steel level apart from ladle
Start rotation after the 0.5m of bottom, be stepped up rotary speed, speed setting is 110r/min.3) injection work reaches opens after 10min
Beginning carries rifle, need to drop to below 5r/min rotating rotating speed before horizontal rifle front end proposes liquid steel level, propose liquid steel level above 0.3m
And keeping this position to spin up 20s again, revolution is 50r/min.4) reduction rotation revolution terminates injection to stopping, complete
Into the dephosphorization process of rotary blowing.
7. it is 0.015% to implement initial phosphorous content before steel grade refining, the finished product phosphorus after the processing of rotary blowing dephosphorization process
Content is 0.0022%, and dephosphorization rate is 86.7%, and temperature drop is 25 DEG C.
Comparative example
Using conventional fixed cylinder spray gun production ultra-low phosphoretic steel in the filling of 260t molten steel, implement the Tapping Temperature of Bof of steel grade
For 1610 DEG C, initial phosphorous content is 0.019% before refining, and carbon is controlled below 0.05%, at non-deoxidation, floating plug pushing off the slag
Reason tapping.Fixed cylinder spray gun bottom uses carrier gas injection dephosphorization agent, carrier gas flux 20Nm away from 0.5 meter of bottom is filled3/ h, carrier gas pressure
Power is 1.2MPa, and carrier gas is Ar.The dephosphorization pulvis composition used contains CaO70%, FeO15%, CaF210%.The grain of Dephosphorising agent
Spend for 0.07mm, the conveying capacity of Dephosphorising agent is 10kg/t.Processing time is 15min.
Molten steel expulsion events are obvious in processing procedure, phosphorus content 0.0045% after rotary blowing processing, and dephosphorization rate is
76.3%, temperature drop is 35 DEG C.
Refining dephosphorization production is carried out compared with conventional refinery using the inventive method, and dephosphorization rate improves 10%, shortening processing
Time 25%, pulvis utilization rate is improved, temperature drop reduces 25%.The present invention both can independently as liquid steel refining dephosphorization process,
It can be applicable in the processes such as the LF of liquid steel refining, argon station, RH, ANS, VD.
Claims (6)
1. a kind of dephosphorization apparatus for refining rotary blowing, it is characterised in that：Including lowering or hoisting gear, air supply system, charging system, rotation
Adapter, rotating device, the horizontal rifle of rotation, T-shaped stirring-head, hollow rotating pipe and framework；The body of a gun of the horizontal rifle of rotation is hollow
Pipe, pipette tips are T-shaped stirring-head, and injection hole, the body of a gun and T-shaped stirring-head parcel refractory material are provided with the both sides of T-shaped stirring-head；Institute
State hollow shaft of the rotating device including motor and Qi Nei；Rotate horizontal rifle to be connected with rotating device bottom, the body of a gun passes through flange and sky
Heart axle is connected；Rotating device top is connected with hollow rotating pipe bottom, and hollow shaft is connected by flange with hollow rotating pipe bottom；
Hollow rotating pipe top is connected with the bearing in swivel joint；Swivel joint is connected with air supply system and charging system；Rotation connects
Head is fixed with framework；Rotating device is fixed in framework, and framework upper end is connected with lowering or hoisting gear；Described lowering or hoisting gear includes volume
Raise machine, fixed pulley, suspension hook, support frame, the guide ring for being arranged on framework side, the guide rod coordinated with guide ring；It is hoist engine, fixed
On pulley, guide rod fixing support rack；Suspension hook is connected by steel wire rope with framework.
2. a kind of dephosphorization apparatus for refining rotary blowing according to claim 1, it is characterised in that：The horizontal rifle of described rotation
Total length is 4500-5000mm, a diameter of 150-200mm of the body of a gun, T-shaped stirring-head length 800-1000mm, a diameter of 300-
400mm, a diameter of 10-20mm of injection hole.
3. a kind of dephosphorization method of the refining rotary blowing dephosphorization apparatus described in application claim 1, comprises the following steps：
1) Tapping Temperature of Bof control is at 1550 DEG C~1650 DEG C, and phosphorus mass percent is controlled below 0.02%；
2) rotate horizontal rifle to be begun to decline by standby position by lowering or hoisting gear, while opening air supply system and charging system, start spray
Dephosphorization pulvis；
3) the T-shaped stirring-head for rotating horizontal rifle enters below liquid steel level and stops declining after the 0.3-1m of ladle bottom, starts
Rotating device is simultaneously stepped up rotary speed, and T-shaped stirring-head speed setting is 5-300r/min；
4) lifting is started by lowering or hoisting gear after rotary blowing 5-10min and rotates horizontal rifle, proposed in the T-shaped stirring-head for rotating horizontal rifle
Rotating speed need to drop to 5-10r/min before liquid steel level, propose liquid steel level above 0.3-0.5m and keep this position to accelerate again
10-30s is rotated, revolution is 50-80r/min；
5) reduction rotating device revolution closes air supply system and charging system to stopping, and terminates injection, completes the de- of rotary blowing
Phosphorus process.
4. a kind of dephosphorization method for refining rotary blowing according to claim 3, it is characterised in that：Described air supply system
Carrier gas flux 10-60Nm3/ h, nebulizer gas pressure 0.3-1.5MPa, carrier gas are Ar gas.
5. a kind of dephosphorization method for refining rotary blowing according to claim 3, it is characterised in that：Described charging system
It is 5-15kg/t to dephosphorization pulvis conveying capacity.
6. a kind of dephosphorization method for refining rotary blowing according to claim 3, it is characterised in that：Described dephosphorization pulvis
Composition contains mass percent CaO40-80%, FeO10-50%, CaF210-30%, granularity is 0.05-0.1mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107119172A (en) * | 2017-04-24 | 2017-09-01 | 鞍钢股份有限公司 | Refining rotary blowing desulfurization device and desulfurization method |
| CN107299192A (en) * | 2017-04-24 | 2017-10-27 | 鞍钢股份有限公司 | Refining rotary blowing deoxidation device and deoxidation method |
| CN109504820A (en) * | 2018-12-05 | 2019-03-22 | 鞍钢股份有限公司 | RH refining rotary powder injection dephosphorization method |
| CN112301187A (en) * | 2019-08-02 | 2021-02-02 | 江苏华久特钢工具有限公司 | Dephosphorization technology and equipment for smelting high-speed steel by medium-frequency induction furnace |
| CN115161436A (en) * | 2022-07-08 | 2022-10-11 | 攀钢集团攀枝花钢铁研究院有限公司 | Dephosphorization method for semisteel |
| CN115505667A (en) * | 2022-09-19 | 2022-12-23 | 首钢集团有限公司 | KR powder injection molten iron pretreatment method |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107119172A (en) * | 2017-04-24 | 2017-09-01 | 鞍钢股份有限公司 | Refining rotary blowing desulfurization device and desulfurization method |
| CN107299192A (en) * | 2017-04-24 | 2017-10-27 | 鞍钢股份有限公司 | Refining rotary blowing deoxidation device and deoxidation method |
| CN109504820A (en) * | 2018-12-05 | 2019-03-22 | 鞍钢股份有限公司 | RH refining rotary powder injection dephosphorization method |
| CN112301187A (en) * | 2019-08-02 | 2021-02-02 | 江苏华久特钢工具有限公司 | Dephosphorization technology and equipment for smelting high-speed steel by medium-frequency induction furnace |
| CN115161436A (en) * | 2022-07-08 | 2022-10-11 | 攀钢集团攀枝花钢铁研究院有限公司 | Dephosphorization method for semisteel |
| CN115505667A (en) * | 2022-09-19 | 2022-12-23 | 首钢集团有限公司 | KR powder injection molten iron pretreatment method |
| CN115505667B (en) * | 2022-09-19 | 2023-09-15 | 首钢集团有限公司 | KR powder spraying molten iron pretreatment method |
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