CN109576443A - A kind of method and device thereof of bottom spray slag charge refined molten steel - Google Patents
A kind of method and device thereof of bottom spray slag charge refined molten steel Download PDFInfo
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- CN109576443A CN109576443A CN201811639473.0A CN201811639473A CN109576443A CN 109576443 A CN109576443 A CN 109576443A CN 201811639473 A CN201811639473 A CN 201811639473A CN 109576443 A CN109576443 A CN 109576443A
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- slag charge
- ladle
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- injection tube
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- 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
- C21C7/0037—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 by injecting powdered material
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- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention discloses a kind of method and device thereof of bottom spray slag charge refined molten steel, belong to metallurgical technology field, to solve the problems, such as that refining slag submerged arc effect is undesirable, active lime utilization rate is low, molten steel easily inhales nitrogen and oxidation in top spray refining.Method includes slag charge grinding, sieving, will be used in the slag charge penetrating ladle of bottom spray refining, heating, refining.Device includes slag charge tank, ladle, slide plate brake apparatus, slag charge tank connects injection tube in the ladle of ladle bottom by injection tube, slide plate brake apparatus includes upper slide, lower skateboard, the mobilizable sliding ring of sandwiched between upper slide and lower skateboard, upper slide, lower skateboard are equipped with slide plate inner hole compatible with injection tube in ladle on sliding ring, and injection tube, slide plate inner hole, injection tube is interconnected in ladle.The present invention can reduce the dosage and slag charge total amount of refining lime in suitable alkalinity ranges, shorten refining time, reduction power consumption, overall cost and decrease, have more apparent economic benefit and social benefit.
Description
Technical field
The invention belongs to metallurgical technology fields, and in particular to a kind of method and device thereof of bottom spray slag charge refined molten steel.
Background technique
With the raising that manufacturing industry requires steel product quality, the refining of LF furnace as raising steel product quality main means it
One, at home and abroad large-scale steel mill has generallyd use furnace outer refining process process, it has also become indispensable in modern steel technique
The even decisive link of important link.
LF furnace is added refining slag and active lime, is improved by making white slag technique stable in steel in refining process
Reducing atmosphere, reaches quick deoxidation, and the main purpose of desulfurization is adjusted additionally by slag system, moreover it is possible to control the sundries shape in steel
State, for improve steel product quality have the function of can not be substituted, therefore to furnace outer refining technology there are the problem of and developing direction
It is necessary to carry out further investigated.
Patent of invention 201110151121.2 invention is a kind of to produce medium carbon steel novel process for smelting using steel spraying powder technology,
Pulvis consumption can be controlled according to initial sulfur content, realize desulfurization rapidly, blowing terminates to be finely adjusted the ingredient in steel；Continuous casting mistake
The casting of Cheng Caiyong full guard, casting process have been started raw using steel spraying powder technology according to the reasonable pulling rate of control of section of steel billet
The novel process for smelting for producing medium carbon steel, realizes desulfurization rapidly and sequence casting, and the Composition Controls such as finished product carbon, phosphorus, sulphur and nitrogen meet
The requirement of specific steel grade.
A kind of steel spraying powder desulfurizing and refining technique for low-sulfur steel production of patent of invention 201110147607.9, specific side
Method is: converter tapping uses the strong deoxidation of ferro-aluminum 3.0-6.5kg/t；Tapping terminates that aluminium 0.4-0.6kg/t is added to carry out to the ladle top of the slag
Top of the slag deoxidation；Ladle, which arrives at a station, pushes up slag oxidizing (ten MnO)≤3.5% of Fe0%；It, can be by steel after this steel spraying powder sulfur removal technology
In sulfur content be removed within 12ppm by 50ppm-80ppm, desulfurization degree can achieve 78.0%-85.0%.
Patent of invention 201110336040.X has invented a kind of Molten steel deep dephosphorization process of ladle powder injection outside furnace, entire to tap
Process and molten steel are in steel spraying powder process, progress argon bottom-blowing stirring；It is carried out into steel spraying powder station top of the slag killing C
Top of the slag deep deoxidation, the dedicated dephosphorization pulvis D of ladle injection, molten steel goes to station of skimming and skims after dephosphorization treatment, at the technique
The reason time is short, high-efficient, rephosphorization amount is small, stable can take off molten steel phosphorus to 0.0015% or less.
A kind of device of the bottom injection refining molten steel with heating function of 201810574886.9 invention of patent of invention, specifically
Method is: for the ladle of refined molten steel, the heating device for heating ladle and for being passed through gas and powder into ladle
The dusting device of agent overcomes inside traditional ladle heating refining furnace that slag-metal reaction condition is poor, and feed difficult defect, solves
Ladle Bottom temperature in smelting process of dusting reduces, and improves desulfuration efficiency, improves steel grade quality, shortens smelting cycle, and
Process of dusting improves the safety of refining without splash.
Patented method similar in the above outer blowing powder or is dusted original part blowing powder by slit by standing
Method, achieve the purpose that desulfurization or dephosphorization, but from the patent of top blowing material, sprayed at station from top by spray gun
Enter, it will cause molten steel adsorbed gas, cause secondary oxidation or the nitrogen pick-up of molten steel, blowing process need to increase dedicated environmental protection and set
Standby, overall technology economic benefit is unobvious；The bottom blowing mode of this patent is closer to as slit blowing, passes through ladle bottom
Slit refractory material original part sprays into pulvis inside ladle, due to the limitation of slit itself unit time blowing amount, pre-slag
Material needs part top to add, it is necessary to heat up by shelves using original technique, molten steel early period control suction nitrogen effect is poor；If all
When being blown, in order to form the slag blanket condition for meeting stabilising arc condition, needs to increase the time of blowing in refining cycle, actually make
Extend at refining cycle, unfavorable for control refining cycle and temperature losses of the process, in addition the above technology is for controlling refining cost, mentioning
Steel quality is risen, unilateral effect is only existed, high-end steel is higher and higher to performance requirements, and the above technology is clearly cannot
Meet the requirement of follow-up developments, how under the premise of meeting the idea of development of national green environmental protection, improves material utilization, strengthens
Refining treatment effect reduces refining energy consumption, needs to find new approach.
In order to solve the problems such as refining slag submerged arc early period effect is bad, active lime utilization rate is low, refining link nitrogen pick-up,
The technology mode that the present invention is dusted by Ladle Bottom provides a kind of method of refining of Ladle Bottom spray slag charge, can be existing in reduction
50% or more active lime dosage is refined, the submerged arc effect of slag charge early period greatly improved, improve the heating efficiency of refining, is reduced
Molten steel inhales nitrogen, strengthens refining effect, meets the policy requirements of high quality development.
Summary of the invention
The purpose of the present invention is to provide a kind of methods of bottom spray slag charge refined molten steel, to solve refining slag in top spray refining
The problem of submerged arc effect is undesirable, active lime utilization rate is low, molten steel easily inhales nitrogen and oxidation.
It is another object of the present invention to provide a kind of devices of bottom spray slag charge refined molten steel, to solve top spray refining nothing
The problem of special equipment.
In order to solve problem above, technical solution of the present invention are as follows:
A kind of method of bottom spray slag charge refined molten steel, it is characterised in that: this method is following steps:
A, slag charge grinding, sieving:
It is -220 mesh refining slag pulvis of 120 mesh that the slag charge for being used for bottom spray refining, which is machined to screen size,；
B, the slag charge for being used for bottom spray refining is sprayed into ladle:
After ladle is hoisted to refining furnace ladle truck position, connect injection tube, i.e., it is openable to help blowing carrier gas, adjust pressure in injection tube
To between 0.5 MPa-0.7Mpa, after stablizing to pressure, closing helps blowing carrier gas, opens the baiting valve of slag charge, makes to be blown carrier gas
It is to spray into molten steel in the injection tube of 12mm-16mm that slag charge, which is carried, from packet bottom diameter, and slag charge is existed by the flow control of injection tube
Between 100kg/min-120kg/min, the blowing time is 3 min -6min, and buggy ladle is run to from bull ladle position while blowing
Station is refined, after the slag charge of penetrating is by molten steel internal-response and heat exchange, fast melt slagging floats up to ladle surface, to ladle
When the slag charge all standing molten steel surface on surface, into next step；
C, it heats up:
It is directly heated up using high tap position, when the slag charge total amount of blowing reaches 5kg/t-6kg/t, molten steel upper surface slag blanket is thick
Degree just can exceed that 50mm, meet submerged arc and heat preservation demand, close the baiting valve of slag charge at this time, keep blowing carrier gas purge blowing system
Unite 0.5min or more, blowing carrier gas is closed later, into next step；
D, it refines:
It opens argon blowing system and carries out refining operation, specific refining time is held by the requirement that steel grade refining operation will put time control
Row.
Further, slag charge includes: 22-25 parts of active lime, 50-60 parts of refining slag, 2-3 parts of silicone oil, is finally formed
Slag charge ingredient is as follows: ω (CaO)=60%-65%, ω (Al2O3)=25%-30%, ω (SiO2)=8%-10%.
Further, active lime calcium oxide content is greater than 93%, and the activity degree of active lime is greater than 360ml.
Further, the preparation step for the slag charge of bottom spray refining are as follows:
A, ingredient:
Weighing takes 22-25 parts of active lime, 50-60 parts of the refining slag uniformly mixed crushers that enter to be crushed, after granularity is up to standard
It is ground into Raymond machine；
B, silicone oil is passivated:
2-3 parts of silicone oil are added and is uniformly mixed with slag material powder, slag charge is passivated.
Further, helping blowing carrier gas is argon gas or carbon dioxide gas.
A kind of device of bottom spray slag charge refined molten steel, including slag charge tank, ladle, slide plate brake apparatus, slag charge tank pass through spray
Blowpipe connects injection tube in the ladle of ladle bottom, and slide plate brake apparatus includes upper slide, lower skateboard, and upper slide is connected to ladle
The bottom of interior injection tube, lower skateboard connection injection tube, the mobilizable sliding ring of sandwiched between upper slide and lower skateboard, upper slide,
It is equipped with slide plate inner hole compatible with injection tube in ladle on lower skateboard, sliding ring, injection tube, slide plate inner hole spray in ladle
Blowpipe is interconnected.
Further, sliding ring passes through hydraulic stem connecting power device.
Further, dust-proof storehouse is equipped with outside slide plate brake apparatus, hydraulic stem is pierced by dust-proof storehouse side connecting power device.
Further, dust-proof storehouse side is equipped with sealing frame, and dust-proof the top of the warehouse and bottom are respectively equipped with asbestos seal pad, upper cunning
Lute pad is equipped in plate and ladle between injection tube.
Further, injection tube is equipped with and helps blowpipe；Injection tube is equipped with baiting valve；Slag charge pot bottom is equipped with Fluidizer,
Slag charge tank connection blowing gas tank.
Beneficial effects of the present invention are as follows:
(1) in the method for the present invention the range selection of slag charge screen size be because are as follows: on the one hand, slag charge processes more tiny cost increase
Amplitude is bigger, unfavorable for the cost control for refining link, while when slag charge is machined to 220 mesh or more, due to its own weight
Amount is smaller, causes under the conditions of same nebulizer gas pressure, the penetration capacity of lance outlet pulvis declines to a great extent, and pulvis enters molten steel
Initial velocity influences the dynamic conditions of reaction and the floating of reaction product, in the minimum requirements of powder combined fluidised form and best
Metallurgical effect in the case where, select slag charge processing screen size be -220 mesh of 120 mesh；
(2) method that the method for the present invention compares existing slit bottom blowing, traditional slit bottom blowing process push up the non-shape of slag in early period
At the longer blowing time before, is needed, i.e., slag charge it is unfused before, high-power cannot heat up, because in the process, arc voltage is not
Lead rupture surely is easily caused, it is general that low-power is selected to heat up, it will cause whole refining time growth in this way and effect turn
It is very low to change coefficient；And the method for the present invention is sprayed by control jetting pressure, packet bottom diameter, injection tube flow to reach in the unit time
The restriction for the amount of blowing, can achieve 100kg/min -120kg/min, therefore can form top slag in the short time, play submerged arc and steady
The effect of arc is conducive to the isolation of molten steel, reduces molten steel and inhales nitrogen, quickly form top slag in early period, for refining the submerged arc of electrode
Play the role of with stabilising arc good；
(3) present invention begins to spray into slag charge after hanging from molten steel to refining furnace buggy ladle system, and the slag charge of penetrating is in uphill process
Middle heat exchange fusing, has formed the melt cinder of melting, has eliminated the low-power liter at refining link initial stage when floating up to ladle upper surface
Thermophase, heating start that high power can be used, i.e., descend after the electrode starting the arc be can be used it is high-power heat up, general 3min-
The top slag for meeting thickness requirement can be formed after 4min, greatly reduces integral refining time, not only reduces power consumption, and effect turns
Change coefficient also to greatly promote, improves the processing capacity of refining on the whole；
(4) existing slag charge, Al in slag charge of the present invention are compared2O3Ratio increases, and is conducive to rapid slagging, by limiting active lime
Performance indicator, cooperate the control of slag charge granularity, slag contacts more abundant with molten steel, conducive to mass-and heat-transfer, makes the reaction of slag charge
More thoroughly, the usage amount of slag charge is reduced；
(5) present invention is sprayed into slag charge in molten steel by injection tube in ladle and injection tube cooperation, and slag charge uphill process can be quickly
It is reacted with sulphur in steel and field trash；Connection using slide plate brake apparatus control injection tube and injection tube in ladle with close
It closes, cooperation hydraulic stem driving is easier to realize；And dust-proof storehouse is set outside slide plate brake apparatus, cooperate sealing frame, asbestos seal
Pad, lute pad, come prevent slag charge spray into during subtle slag charge dust recycling into operating environment, influence environment and operation people
Member's health；Fluidizer carries out fluidization, and discharge velocity is accurately controlled by baiting valve, by controlling rate of dusting, meets
The blowing of ladle refining process needs；Help blowpipe in refining early period for pipe pressurizing, the later period is for slag charge purging in pipeline；
(6) present invention, which combines the restriction of blowing amount in the unit time using powdery slag charge and device, increases reaction interface, guarantees
It can thoroughly be reacted inside slag charge particle, the compound of low melting point easily generated, it is ensured that slag charge mobility is more advantageous to and mentions
The utilization rate of CaO in slag charge is risen, transformation front and back data shows:, can be compared to 60% or more CaO utilization rate raising in the charging of top
The dosage and slag charge total amount that refining lime is reduced in suitable alkalinity ranges, shorten refining time, reduce power consumption, overall cost with
Reduction, have more apparent economic benefit and social benefit.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram for the device that slag charge refined molten steel is sprayed at bottom；
Fig. 2 is a kind of structural schematic diagram for the device middle slide plate closing device that slag charge refined molten steel is sprayed at bottom；
Fig. 3 is the top view of Fig. 2；
Fig. 4 is the off working state schematic diagram that the device middle slide plate closing device of slag charge refined molten steel is sprayed at a kind of bottom of Fig. 3.
Appended drawing reference is as follows: 1, slag charge tank；11, Fluidizer；12, it is blown gas tank；13, blowpipe is helped；14, injection tube；15, right
Slag charge；2, ladle；21, injection tube in ladle；3, slide plate brake apparatus；31, power device；32, upper slide；33, lower skateboard；
34, sliding ring；35, slide plate inner hole；36, hydraulic stem；4, dust-proof storehouse；41, sealing frame；42, asbestos seal pad；5, lute pad.
Specific embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
As shown in Figs 1-4, a kind of device of bottom spray slag charge refined molten steel, including slag charge tank 1, ladle 2, slide plate brake apparatus
3,1 bottom of slag charge tank is equipped with Fluidizer 11, and slag charge tank 1 is connected with blowing gas tank 12, and slag charge tank 1 connects ladle by injection tube 14
Injection tube 21 in the ladle of 2 bottoms, injection tube 14 are equipped with and help blowpipe 13；Injection tube 14 is equipped with baiting valve 15；Slide plate braking
Device 3 includes upper slide 32, lower skateboard 33, and upper slide 32 is connected to the bottom of injection tube 21 in ladle, the connection spray of lower skateboard 33
Blowpipe 14, the mobilizable sliding ring 34 of sandwiched between upper slide 32 and lower skateboard 33, upper slide 32, lower skateboard 33, sliding ring 34
On be equipped with slide plate inner hole 35 compatible with injection tube 21 in ladle, injection tube 14, slide plate inner hole 35, injection tube 21 in ladle
It is interconnected, sliding ring 34 passes through 36 connecting power device 31 of hydraulic stem, and dust-proof storehouse 4 is equipped with outside slide plate brake apparatus 3, hydraulic
Bar 36 is pierced by dust-proof 4 side connecting power device 31 of storehouse, and dust-proof 4 side of storehouse is equipped with sealing frame 41, divides at the top and bottom of dust-proof storehouse 4
Not She You asbestos seal pad 42, lute pad 5 is equipped in upper slide 32 and ladle between injection tube 21.
Embodiment 1
Ladle is 50 tons in the present embodiment, and blowing pipe diameter is 12mm in ladle, blowing gas and blowing is helped to select argon gas.
1. slag charge grinding, sieving:
(1) ingredient and mixing:
Weighing takes 22 parts of active lime, 60 parts of the refining slag uniformly mixed crushers that enter to be crushed, and enters thunder after granularity is up to standard
Illiteracy machine carries out ground and mixed, and it is 94.73% that wherein active lime calcium oxide content, which enters factory's chemical analysis results, and activity degree enters factory
It is 365ml that result is analysed in credit.
(2) silicone oil is passivated:
By analysis machine being mixed in 2 parts of addition Raymond machines of silicone oil with slag material powder, slag charge is passivated, it is carried out later
Chemical analysis, Con trolling index are as follows:
ω (CaO)=60%, ω (Al2O3)=30%, ω (SiO2)=8%.
2. the slag charge for being used for bottom spray refining is sprayed into ladle:
After ladle is hoisted to refining furnace ladle truck position, opening helps blowpipe 13 that it is made to adjust jetting pressure between 0.5 MPa, opens
Startup power device 31 makes it control hydraulic stem 36 and sliding ring 34 is pushed to enter between upper slide 32 and lower skateboard 33, and keeps spraying
Blowpipe 14, slide plate inner hole 35, the interconnected state of injection tube 21 in ladle, after stablizing to pressure, closing helps blowpipe 13, beats
Blowing gas tank 12 and baiting valve 15 are opened, so that blowing carrier gas is carried slag charge and is successively blown in injection tube 14, slide plate inner hole 35, ladle
Pipe 21 sprays into molten steel, entire to be blown the flow control of process slag charge between 100kg/min, and the blowing time is 3 min, blowing
Buggy ladle runs to refining station from bull ladle position simultaneously, after the slag charge of penetrating is by molten steel internal-response and heat exchange, fast melt
Slagging floats up to ladle surface, when the slag charge all standing molten steel surface on ladle surface, into next step.
3. heating:
When blowing amount reaches 300kg, molten steel upper surface thickness of slag layer has been more than 50mm, meets submerged arc and heat preservation demand, directly
It is heated up using high tap position, closes the baiting valve 15 and blowing gas tank 12 of slag charge at this time, opening helps the holding of blowpipe 13 to help Argon
Injection system 0.5min or more is swept in air-blowing, closes help blowpipe 13 and slide plate brake apparatus 3 later, so that in injection tube 14, ladle
Injection tube 21 is staggered with slide plate inner hole 35.
The argon gas of refining argon blowing system is opened, 8min is refined.
3. technique and other prior arts compare:
(1) this process is refined compared to top blast, is all the ladle of 50t, and the top-blown method quantity of slag is reduced in 550kg or so, the present invention
Slag charge 250kg or so, reaction interface increases after the spray of slag charge bottom, improves the utilization rate of slag charge, meanwhile, the testing result after refining
Display: desulfurization degree improves 20% or more.
Due to rapid slagging after slag charge floating-upward process and molten steel progress heat exchange, slag blanket is more than i.e. usable top grade after 50mm
Position is rapidly heated, and under the premise of controlling molten steel nitrogen pick-up, improves efficiency transformation ratio, shortens refining time 3min or more, ton
Steel power consumption can decline 4.5kw.h, convert by enterprise's electricity price, 2.8 yuan/ton of steel of save the cost.
(2) slit bottom blowing refining is compared, slag charge unit time blowing amount is up to 100kg/min, using ladle from bull ladle
Position time to before refining is blown, and is not needed the period for increasing blowing powder, can be shortened refining cycle 3min or more, in addition originally
The pulvis initial velocity that patent sprays into reaches 120m/min, and pulvis ascent rate is very fast, desulfurization and the efficiency for removing desulfurization product
15% or more can be promoted.
Embodiment 2
Ladle is 120 tons in the present embodiment, and blowing pipe diameter is 16mm in ladle, and blowing gas selects argon gas, blowing is helped to select
Use carbon dioxide.
1. slag charge grinding, sieving:
(1) ingredient and mixing:
Weighing takes 25 parts of active lime, 50 parts of the refining slag uniformly mixed crushers that enter to be crushed, and enters thunder after granularity is up to standard
Illiteracy machine carries out ground and mixed, and it is 95.63% that wherein active lime calcium oxide content, which enters factory's chemical analysis results, and activity degree enters factory
It is 372ml that result is analysed in credit.
(2) silicone oil is passivated:
By analysis machine being mixed in 3 parts of addition Raymond machines of silicone oil with slag material powder, slag charge is passivated, it is carried out later
Chemical analysis, Con trolling index are as follows:
ω (CaO)=65%, ω (Al2O3)=25%, ω (SiO2)=10%.
After ladle is hoisted to refining furnace ladle truck position, opening helps blowpipe 13 that it is made to adjust jetting pressure to 0.7Mpa, opens
Startup power device 31 makes it control hydraulic stem 36 and sliding ring 34 is pushed to enter between upper slide 32 and lower skateboard 33, and keeps spraying
Blowpipe 14, slide plate inner hole 35, the interconnected state of injection tube 21 in ladle, after stablizing to pressure, closing helps blowpipe 13, beats
Blowing gas tank 12 and baiting valve 15 are opened, so that blowing carrier gas is carried slag charge and is successively blown in injection tube 14, slide plate inner hole 35, ladle
Pipe 21 sprays into molten steel, entire to be blown the flow control of process slag charge between 120kg/min, and the blowing time is 6min, blowing
Buggy ladle runs to refining station from bull ladle position simultaneously, after the slag charge of penetrating is by molten steel internal-response and heat exchange, fast melt
Slagging floats up to ladle surface, when the slag charge all standing molten steel surface on ladle surface, into next step.
3. heating:
When blowing amount reaches 600kg, molten steel upper surface thickness of slag layer has been more than 50mm, meets submerged arc and heat preservation demand, directly
It is heated up using high tap position, closes the baiting valve 15 and blowing gas tank 12 of slag charge at this time, opening helps the holding of blowpipe 13 to help Argon
Injection system 0.6min is swept in air-blowing, closes help blowpipe 13 and slide plate brake apparatus 3 later, so that blowing in injection tube 14, ladle
Pipe 21 is staggered with slide plate inner hole 35.
The argon gas of refining argon blowing system is opened, 20min is refined.
3. technique and other prior arts compare:
(1) this process is refined compared to top blast, is all the ladle of 120t, the top-blown method quantity of slag subtracts in 1200kg or so, the present invention
Few slag charge 600kg or so, reaction interface increases after the spray of slag charge bottom, improves the utilization rate of slag charge, meanwhile, the detection knot after refining
Fruit shows: desulfurization degree can be improved 15% or more.
Due to rapid slagging after slag charge floating-upward process and molten steel progress heat exchange, slag blanket is more than i.e. usable top grade after 50mm
Position is rapidly heated, and under the premise of controlling molten steel nitrogen pick-up, improves efficiency transformation ratio, shortens refining time 5min or more, ton
Steel power consumption can decline 5.5kw.h, convert by enterprise's electricity price, 3.8 yuan/ton of steel of save the cost.
(2) slit bottom blowing refining is compared, slag charge unit time blowing amount is up to 120kg/min, using ladle from bull ladle
Position time to before refining is blown, and is not needed the period for increasing blowing powder, can be shortened refining cycle 5min or more, in addition originally
The pulvis initial velocity that patent sprays into reaches 120m/min, and pulvis ascent rate is very fast, desulfurization and the efficiency for removing desulfurization product
16% or more can be promoted.
Embodiment 3
Ladle is 80 tons in the present embodiment, and blowing pipe diameter is 14mm in ladle, and blowing gas selects argon gas, blowing is helped to select
Argon gas.
1. slag charge grinding, sieving:
(1) ingredient and mixing:
Weighing takes 23 parts of active lime, 55 parts of the refining slag uniformly mixed crushers that enter to be crushed, and enters thunder after granularity is up to standard
Illiteracy machine carries out ground and mixed, and it is 94.12% that wherein active lime calcium oxide content, which enters factory's chemical analysis results, and activity degree enters factory
It is 363ml that result is analysed in credit.
(2) silicone oil is passivated:
By analysis machine being mixed in 2.5 parts of addition Raymond machines of silicone oil with slag material powder, slag charge is passivated, later to its into
Row chemical analysis, Con trolling index are as follows:
ω (CaO)=63%, ω (Al2O3)=27%, ω (SiO2)=9.4%.
After ladle is hoisted to refining furnace ladle truck position, opening helps blowpipe 13 that it is made to adjust jetting pressure to 0.6Mpa, opens
Startup power device 31 makes it control hydraulic stem 36 and sliding ring 34 is pushed to enter between upper slide 32 and lower skateboard 33, and keeps spraying
Blowpipe 14, slide plate inner hole 35, the interconnected state of injection tube 21 in ladle, after stablizing to pressure, closing helps blowpipe 13, beats
Blowing gas tank 12 and baiting valve 15 are opened, so that blowing carrier gas is carried slag charge and is successively blown in injection tube 14, slide plate inner hole 35, ladle
Pipe 21 sprays into molten steel, entire to be blown the flow control of process slag charge between 110kg/min, and the blowing time is 4.5min, blowing
While buggy ladle from bull ladle position run to refining station, after the slag charge of penetrating is by molten steel internal-response and heat exchange, quickly melt
Chemical conversion slag floats up to ladle surface, when the slag charge all standing molten steel surface on ladle surface, into next step.
3. heating:
When blowing amount reaches 460kg, molten steel upper surface thickness of slag layer has been more than 50mm, meets submerged arc and heat preservation demand, directly
It is heated up using high tap position, closes the baiting valve 15 and blowing gas tank 12 of slag charge at this time, opening helps the holding of blowpipe 13 to help Argon
Injection system 0.6min is swept in air-blowing, closes help blowpipe 13 and slide plate brake apparatus 3 later, so that blowing in injection tube 14, ladle
Pipe 21 is staggered with slide plate inner hole 35.
The argon gas of refining argon blowing system is opened, 16min is refined.
3. technique and other prior arts compare:
(1) this process is refined compared to top blast, is all the ladle of 80t, and the top-blown method quantity of slag is reduced in 860kg or so, the present invention
Slag charge 400kg or so, reaction interface increases after the spray of slag charge bottom, improves the utilization rate of slag charge, meanwhile, the testing result after refining
Display: desulfurization degree can be improved 21% or more.
Due to rapid slagging after slag charge floating-upward process and molten steel progress heat exchange, slag blanket is more than i.e. usable top grade after 50mm
Position is rapidly heated, and under the premise of controlling molten steel nitrogen pick-up, improves efficiency transformation ratio, shortens refining time 5min or more, ton
Steel power consumption can decline 4.7kw.h, convert by enterprise's electricity price, 3.1 yuan/ton of steel of save the cost.
(2) slit bottom blowing refining is compared, slag charge unit time blowing amount is up to 110kg/min, using ladle from bull ladle
Position time to before refining is blown, and is not needed the period for increasing blowing powder, can be shortened refining cycle 4min or more, in addition originally
The pulvis initial velocity that patent sprays into reaches 110m/min, and pulvis ascent rate is very fast, desulfurization and the efficiency for removing desulfurization product
16% or more can be promoted.
Claims (10)
1. a kind of method of bottom spray slag charge refined molten steel, it is characterised in that: this method is following steps:
A, slag charge grinding, sieving:
It is -220 mesh refining slag pulvis of 120 mesh that the slag charge for being used for bottom spray refining, which is machined to screen size,；
B, the slag charge for being used for bottom spray refining is sprayed into ladle:
After ladle is hoisted to refining furnace ladle truck position, connect injection tube, i.e., it is openable to help blowing carrier gas, adjust pressure in injection tube
To between 0.5 MPa-0.7Mpa, after stablizing to pressure, closing helps blowing carrier gas, opens the baiting valve of slag charge, makes to be blown carrier gas
It is to spray into molten steel in the injection tube of 12mm-16mm that slag charge, which is carried, from packet bottom diameter, and slag charge is existed by the flow control of injection tube
Between 100kg/min-120kg/min, the blowing time is 3 min -6min, and buggy ladle is run to from bull ladle position while blowing
Station is refined, after the slag charge of penetrating is by molten steel internal-response and heat exchange, fast melt slagging floats up to ladle surface, to ladle
When the slag charge all standing molten steel surface on surface, into next step；
C, it heats up:
It is directly heated up using high tap position, when the slag charge total amount of blowing reaches 5kg/t-6kg/t, molten steel upper surface slag blanket is thick
Degree just can exceed that 50mm, meet submerged arc and heat preservation demand, close the baiting valve of slag charge at this time, keep blowing carrier gas purge blowing system
Unite 0.5min or more, blowing carrier gas is closed later, into next step；
D, it refines:
It opens argon blowing system and carries out refining operation, specific refining time is held by the requirement that steel grade refining operation will put time control
Row.
2. a kind of method of bottom spray slag charge refined molten steel as described in claim 1, it is characterised in that: the slag charge includes: work
Property 22-25 parts of lime, 50-60 parts of refining slag, 2-3 parts of silicone oil, the slag charge ingredient finally formed are as follows: ω (CaO)=60%-65%,
ω (Al2O3)=25%-30%, ω (SiO2)=8%-10%.
3. a kind of method of bottom spray slag charge refined molten steel as claimed in claim 2, it is characterised in that: the active lime oxidation
Calcium content is greater than 93%, and the activity degree of active lime is greater than 360ml.
4. a kind of method of bottom spray slag charge refined molten steel as claimed in claim 3, it is characterised in that: described for bottom spray refining
Slag charge preparation step are as follows:
A, ingredient:
Weighing takes 22-25 parts of active lime, 50-60 parts of the refining slag uniformly mixed crushers that enter to be crushed, after granularity is up to standard
It is ground into Raymond machine；
B, silicone oil is passivated:
2-3 parts of silicone oil are added and is uniformly mixed with slag material powder, slag charge is passivated.
5. a kind of method of bottom spray slag charge refined molten steel as described in claim 1, it is characterised in that: described to help blowing carrier gas for argon
Gas or carbon dioxide gas.
6. a kind of device of the spray of bottom used in claim 1 the method slag charge refined molten steel, it is characterised in that: including slag charge
Tank (1), ladle (2), slide plate brake apparatus (3), the slag charge tank (1) connect the steel of ladle (2) bottom by injection tube (14)
Injection tube (21) in wrapping, the slide plate brake apparatus (3) include upper slide (32), lower skateboard (33), and the upper slide (32) is even
The bottom of the injection tube (21) in ladle is connect, the lower skateboard (33) connects injection tube (14), the upper slide (32) and downslide
The mobilizable sliding ring of sandwiched (34) between plate (33), the upper slide (32), lower skateboard (33), sliding ring are equipped on (34)
The compatible slide plate inner hole (35) with injection tube in ladle (21), the injection tube (14), slide plate inner hole (35), the interior blowing of ladle
(21) are managed to be interconnected.
7. a kind of device of bottom spray slag charge refined molten steel as claimed in claim 6, it is characterised in that: the sliding ring (34) is logical
Cross hydraulic stem (36) connecting power device (31).
8. a kind of device of bottom spray slag charge refined molten steel as claimed in claim 7, it is characterised in that: the slide plate brake apparatus
(3) external to be equipped with dust-proof storehouse (4), the hydraulic stem (36) is pierced by dust-proof storehouse (4) side connecting power device (31).
9. a kind of device of bottom spray slag charge refined molten steel as claimed in claim 8, it is characterised in that: dust-proof storehouse (4) side
Portion is equipped with sealing frame (41), is respectively equipped with asbestos seal pad (42) at the top and bottom of the dust-proof storehouse (4), the upper slide (32)
Lute pad (5) are equipped between injection tube in ladle (21).
10. a kind of device of bottom spray slag charge refined molten steel as claimed in claim 9, it is characterised in that: the injection tube (14)
It is equipped with and helps blowpipe (13)；The injection tube (14) is equipped with baiting valve (15)；Slag charge tank (1) bottom is equipped with Fluidizer
(11), slag charge tank (1) connection blowing gas tank (12).
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| CN111748671A (en) * | 2020-07-08 | 2020-10-09 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Cold-state refining slag recycling system and method |
| CN115161435A (en) * | 2022-07-05 | 2022-10-11 | 鞍钢股份有限公司 | Method for controlling sulfur and sulfide inclusions in heavy rail steel |
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| CN109576443B (en) | 2023-06-06 |
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