CN109880965A - The device and method that a kind of converter taphole top powder dephosphorization realizes pushing off the slag simultaneously - Google Patents
The device and method that a kind of converter taphole top powder dephosphorization realizes pushing off the slag simultaneously Download PDFInfo
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Abstract
The invention belongs to converter steeling technology fields, are related to a kind of device and method converter taphole top powder dephosphorization while realizing pushing off the slag.The device includes mobile system, air supply system, control system, powder spraying system and slag-blocking system.Method is as follows: being flush type spray gun above converter taphole, spray gun is connected with air supply system with powder spraying system, for being blown into inert gas and Dephosphorising agent in converter tapping process；When converter tapping starts, the traveling and lifting of spray gun are controlled by mobile system, immerses it in molten steel, are reached above tapping hole, while guaranteeing that skimming ball is located on the top of the slag；In converter tapping latter stage, when tap reaches 2/3~3/4, skimming ball is put into molten steel, its slag stopping function is realized, improves the utilization rate of Dephosphorising agent and improve molten steel recovery rate；After tapping, stop jet, is removed spray gun outside converter by mobile device.The device of the invention structure is simple, easy to operate, has very strong practical application value.
Description
Technical field
The invention belongs to converter steeling technology fields, and in particular to a kind of converter taphole top powder dephosphorization is realized simultaneously
The device and method of pushing off the slag.
Background technique
Impurity can change the performance of steel in steel, reduce steel product quality.Phosphorus, easily in cyrystal boundary segregation, is made as surface-active impurity
At black brittleness, steel toughness and deformability are reduced.Many high-quality steel are stringenter to phosphorus content requirement, therefore to steel
Liquid dephosphorization is of great significance and domestic and foreign scholars' research hotspot all the time.
In steel manufacture process the removal of phosphorus mainly molten iron pre-process, two stages of converter or the electric furnace heat of oxidation into
Row.Liquid iron pretreatment dephosphorizing can reduce converter dephosphorization load, but the main powder dephosphorization in hot-metal bottle of the pre- dephosphorization of molten iron, hold
Product is limited, and shape is also unfavorable for slag-metal reaction, and dephosphorization is inefficient (can only achieve 65~70%), and obtained half steel is carbon containing
Amount causes later period decarburization shortage of heat 3.0~3.4%.
Dephosphorization technology mainly carries out dephosphorization under oxidizing atmosphere to molten steel using vessel slag in converter, and converter dephosphorization technique mainly has single slag
The double slag dephosphorization technologies of method, converter duplex dephosphorized technique, dephosphorization rifle/decarburization rifle.Certain company also utilizes converter smelting to add tapping dephosphorization
Molten steel deep dephosphorization is studied.
In above-mentioned technique, using duplex practice dephosphorization, integrated artistic dephosphorization rate up to 91.7%, can reduce lime consumption and
Iron loss, but due to needing to tap twice, heat waste is larger, the not gas recovery during dephosphorization, so that coal-gas recovering amount declines.
Using the double slag dephosphorization technologies of dephosphorization rifle/decarburization rifle, integrated artistic dephosphorization rate has reached 93.8%, can reduce a ton steel stone
Ash consumption.But dephosphorization rifle occupies rifle position, is not available spare rifle, carries out changing rifle operation, has certain influence to production.
Dephosphorising agent is added after molten steel enters ladle using converter smelting plus tapping dephosphorization technology, is fallen using molten steel good
Good dynamic conditions carries out dephosphorization, this method dephosphorization rate highest, integrated artistic dephosphorization rate is up to 97.5%.But ladle dephosphorization
After need to remove dephosphorized slag, just can be carried out refining, need to skim to ladle or molten steel is ladle-to-ladle, brought to production process tired
It is difficult.
Containing ingredients such as iron oxide, manganese oxide and silica in vessel slag, these generate not steel quality at branch
Benefit influences.Phenomena such as tapping latter stage, conflux vortex and the heavy hole of drainage can be generated above tapping hole, causes vessel slag to flow into ladle,
Molten steel recovery rate is reduced, refractory life is reduced, seriously affects industrial production efficiency.
In order to reduce the steel slag amount from converter taphole outflow ladle, iron and steel enterprise, which generallys use, launches skimming ball, pushing off the slag
Plug, the methods of pneumatic dreg blocking reduce slag.
Summary of the invention
In order to solve the above-mentioned technical problem, the present invention proposes powder dephosphorization above a kind of converter taphole while realizing pushing off the slag
Device and method.
Technical solution of the present invention:
Powder dephosphorization realizes the device of pushing off the slag simultaneously above a kind of converter taphole, including mobile system, air supply system 11,
Control system, powder spraying system 10 and slag-blocking system.
The mobile system includes lifting device 6 and moving device 7；The lifting device 6 is fixedly mounted on control
On the console 9 of system, the discharge tube 5 of powder spraying system 10 is fixed on the crossbeam of slag-blocking system, and crossbeam is mounted on lifting device 6
On, the lifting of crossbeam and discharge tube 5 is controlled by lifting device 6；The moving device 7 be fixed on lifting device 6 and with
The crossbeam of slag-blocking system is connected, and controls moving left and right for crossbeam and discharge tube 5 by moving device 7, final to realize 5 end of discharge tube
Adjustment of the skimming ball 4 of the flush type spray gun in portion and slag-blocking system in 3 top position of converter taphole；
The control system includes console 9 and control device, on the surface-based rail 8 of console 9,
Console 9 is moved left and right along rail 8；The control device is mounted in console 9, and with moving device 7 and lifting device 6
It is connected, to control the lifting of mobile system and move left and right, to realize that the lifting of flush type spray gun and skimming ball 4 and left and right move
It is dynamic；
The air supply system 11 includes air accumulator 12 and air-flow distributor 13；The air accumulator 12 and air-flow distributor
13 are connected by pipeline, and pipeline between the two is equipped with total valve 22；Three gas circuits are separated from air-flow distributor 13,
In, the first gas circuit is connect with the powder spraying pot 16 of powder spraying system 10, and the first gas circuit is equipped with the first gas circuit valve 19 and first pressure
Table 23；Second gas circuit is connect with the fluidising chamber 15 of powder spraying system 10, and the second gas circuit is equipped with the second gas circuit valve 20 and the second pressure
Power table 24；Third gas circuit is connect with the gas powder mixing chamber 14 of powder spraying system 10, and third gas circuit is equipped with 21 He of third gas circuit valve
Third pressure gauge 25；And flowmeter is housed in each gas circuit；
The powder spraying system 10 includes powder spraying pot 16, discharge tube 5, the gentle powder mixing chamber 14 of fluidising chamber 15；The spray
Powder tank 16 is located at 15 top of fluidising chamber, the bottom of powder spraying pot 16 and the top of fluidising chamber 15 for storing Dephosphorising agent, powder spraying pot 16
It is connected by pipeline, pipeline between the two is equipped with the first baiting valve 17；The bottom of the fluidising chamber 15 and gas powder are mixed
The top for closing room 14 is connected by pipeline, and pipeline between the two is equipped with the second baiting valve 18；The gas powder mixing chamber
14, one side and third air circuit connection, the other side are connected with one end of discharge tube 5, and the crossbeam of discharge tube 5 and slag-blocking system is tied
It ties up and is integrated；The discharge tube 5, the other end are divided into two branches, and two branches are at an angle to each other, the end peace of each branch
It is immersed in flush type spray gun in molten steel 2 by the adjustment of mobile system equipped with flush type spray gun and is located at converter taphole 3
Top；
The slag-blocking system is placed in using dispensing skimming ball technology, including skimming ball 4 and crossbeam, the skimming ball 4
The front end of crossbeam, skimming ball 4 are located on clinker and are located at the top in gap between two flush type spray guns, when release, pushing off the slag
Ball 4 is fallen into molten steel 2 from the gap among two flush type spray guns；When tap reaches 2/3~3/4, by the gear on crossbeam
The release of slag ball 4 is put into molten steel 2, and the density of skimming ball 4 starts to float on slag gold interface between vessel slag and molten steel 2, with
The reduction of molten steel 2, eventually fall in converter taphole 3, realize pushing off the slag.
The material of the discharge tube 5 is refractory material.
Gas in the air accumulator 12 is inert gas, such as argon gas and nitrogen.
The method that a kind of converter taphole top powder dephosphorization realizes pushing off the slag simultaneously, the specific steps are as follows:
(1) powder dephosphorization above converter taphole is realized to the console 9 of the device of pushing off the slag is mounted on rail 8 simultaneously,
Move whole device along rail 8；
(2) when converter grate starts tapping, the mobile system of the rotary system of converter and device is cooperated, is passed through
The lifting of lifting device 6 and moving device 7 move left and right in mobile system, adjust flush type spray gun and gear in powder spraying system 10
The position of skimming ball 4 in slag system makes flush type spray gun be immersed in the top in molten steel 2 and being located at converter taphole 3, skimming ball
4 are located on clinker and are located at the top in gap between two flush type spray guns；All valves of powder spraying system 10 are closed, are opened
The total valve 22 and third gas circuit valve 21 of air supply system 11, inert gas in air accumulator 12 by after air-flow distributor 13 according to
Secondary to enter converter body 1 by gas powder mixing chamber 14, discharge tube 5 and flush type spray gun, adjusting throughput is 40~60L/min,
0.5~1.0MPa of jetting pressure, air supply system 11 carries out air blowing stirring to molten steel 2 at this time, and Dephosphorising agent does not enter in molten steel 2；
(3) it blows after stablizing, opens the first gas circuit valve 19 and the first baiting valve 17, enter Dephosphorising agent from powder spraying pot 16
In fluidising chamber 15, after closing the first baiting valve 17, the second gas circuit valve 20 is opened, the second gas circuit fluidizes Dephosphorising agent, flows
The second baiting valve 18 changed between room 15 and gas powder mixing chamber 14 is in off state；
(4) Dephosphorising agent sufficiently fluidizes in fluidising chamber 15, when pressure is greater than gas powder mixing chamber 14 in fluidising chamber 15, opens
Dephosphorising agent is blown into Converter under the action of carrier gas stream by the second baiting valve 18 between fluidising chamber 15 and gas powder mixing chamber 14
Body 1 carries out powder dephosphorization to molten steel 2, and gas flow is adjusted to 80~100L/min, and powder to air ratio is 1~10；And according to furnace of walking around
The rotation angle of furnace body 1 adjusts the position of flush type spray gun at any time, is in flush type spray gun under slag interface always, to steel
Liquid 2 carries out powder dephosphorization；
(5) when tap reaches between 2/3~3/4, the skimming ball 4 of slag-blocking system is discharged, due to the density of skimming ball 4
Between molten steel 2 and clinker, skimming ball 4 is suspended in slag gold interface, and continuing to dust carries out dephosphorization to molten steel 2；
(6) when converter body 1 rotates 80~85 °, the first gas circuit valve 19 and the second gas circuit valve 20 is successively closed, is stopped
It is only blown, whole device is removed, turn off third gas circuit valve 21；When blocking converter taphole 3 to skimming ball 4, tapping knot
Beam.
The Dephosphorising agent is CaO and CaF2。
The granularity of the Dephosphorising agent is 400~600 mesh.
Compared with prior art, the beneficial effects of the present invention are:
(1) present invention further utilizes powder spraying stirring dephosphorization on converter dephosphorization Process ba- sis, reduces phosphorus content in molten steel,
Further increase quality of molten steel；
(2) into molten steel, blown inert gas dusts, and compared with simple blown inert gas, increases solid particle in molten steel,
It blows molten steel to be stirred, reduces gas content in molten steel；
(3) dusting device is set above converter taphole, it, will in converter terminal tapping using inert gas as carrier gas
Dephosphorising agent sprays into molten steel, and powder dephosphorization technique and air blowing Slag Retaining Process are organically combined.Using gas agitating effect, formed good
Good dynamic conditions reinforces dephosphorization effect, improves quality of molten steel, shortens the production cycle, improves the recovery rate of Dephosphorising agent, simultaneously
Effectively reduce the slag amount into ladle.
(4) the device of the invention is handling strong, can be adjusted at any time according to field condition.
Detailed description of the invention
Fig. 1 is powder dephosphorization while the flow chart for the method for realizing pushing off the slag above a kind of converter taphole；
Fig. 2 is the overall structure diagram of powder dephosphorization while the device for realizing pushing off the slag above a kind of converter taphole；
Fig. 3 is the powder spraying system and slag-blocking system of powder dephosphorization while the device for realizing pushing off the slag above a kind of converter taphole
Partial schematic diagram；
Fig. 4 is the structural schematic diagram of powder spraying system and air supply system.
Wherein: 1 converter body；2 molten steel；3 converter tapholes；4 skimming balls；5 discharge tubes；6 lifting devices；7 moving devices；
8 rails；9 consoles；10 powder spraying systems；11 air supply systems；12 air accumulators；13 air-flow distributors；14 gas powder mixing chambers；15 fluidisations
Room；16 powder spraying pots；17 first baiting valves；18 second baiting valves；19 first gas circuit valves；20 second gas circuit valves；21 third gas
Road valve；22 total valves；23 first pressure gauges；24 second pressure gauges；25 third pressure gauges.
Specific embodiment
Below in conjunction with attached drawing and technical solution, a specific embodiment of the invention is further illustrated.
As in Figure 2-4, a kind of converter taphole top powder dephosphorization realizes the device of pushing off the slag, including mobile system simultaneously
System, air supply system 11, control system, powder spraying system 10 and slag-blocking system.
The mobile system includes lifting device 6 and moving device 7；The control system includes console 9 and control
Device processed；The air supply system 11 includes air accumulator 12 and air-flow distributor 13；The powder spraying system 10 includes powder spraying pot
16, discharge tube 5, the gentle powder mixing chamber 14 of fluidising chamber 15；The slag-blocking system is using dispensing skimming ball technology, including skimming ball
4 and crossbeam.
As shown in Figure 1, a kind of method that powder dephosphorization realizes pushing off the slag simultaneously above converter taphole, specific as follows:
(1) it is covered with rail 8 on the ground, powder dephosphorization above converter taphole is realized to the console 9 of the device of pushing off the slag simultaneously
It is mounted on rail 8, moves whole device along rail 8；Each system is powered on；
(2) converter grate start tapping when, the mobile system of the rotary system of converter and device is coupled, with turn
Furnace tapping process rotates angle difference, and by the movement of the lifting of lifting device 6 and moving device 7 in mobile system, adjustment is buried
Enter 4 position of formula spray gun and skimming ball, be in flush type spray gun always under slag interface and be located at the upper of converter taphole 3
Side, skimming ball 4 on slag interface, close all valves of powder spraying system 10 always, open the main valve of air supply system 11
Door 22 and third gas circuit valve 21, argon gas in air accumulator 12 by after air-flow distributor 13 successively by gas powder mixing chamber 14,
Discharge tube 5 and flush type spray gun enter converter body 1, and adjusting throughput is 50L/min, jetting pressure 0.75MPa, at this time dephosphorization
Agent does not enter molten steel 2, and air supply system 11 carries out air blowing stirring to molten steel 2；First pressure gauge 23, second pressure gauge 24 and third pressure
Power table 25 is used for observed pressure；
(3) it blows after stablizing, opens the first gas circuit valve 19 and the first baiting valve 17, be the Dephosphorising agent of 500 mesh by granularity
Enter in fluidising chamber 15 from powder spraying pot 16, after closing the first baiting valve 17, opens the second gas circuit valve 20, the second gas circuit is to dephosphorization
Agent is fluidized, at this point, the second baiting valve 18 between fluidising chamber 15 and gas powder mixing chamber 14 is in off state；
(4) Dephosphorising agent sufficiently fluidizes in fluidising chamber 15, when pressure is greater than gas powder mixing chamber 14 in fluidising chamber 15, opens
Dephosphorising agent is blown into Converter under the action of carrier gas stream by the second baiting valve 18 between fluidising chamber 15 and gas powder mixing chamber 14
Body 1 carries out powder dephosphorization to molten steel 2, and gas flow is adjusted to 90L/min at this time, and powder to air ratio is controlled 5；According to furnace of walking around
The rotation angle of furnace body 1 adjusts the position of flush type spray gun, is in flush type spray gun under slag interface always, to molten steel 2
Carry out powder dephosphorization；
(5) skimming ball 4 is discharged when tap reaches between 2/3~3/4, since 4 density of skimming ball is between molten steel and furnace
It between slag, can be suspended on slag interface, continuing to dust during this period carries out dephosphorization to molten steel 2；
(6) when converter body 1 rotates 80~85 °, the first gas circuit valve 19 and the second gas circuit valve 20 is successively closed, is stopped
It only dusts and blows, whole device is removed into converter, turn off third gas circuit valve 21.Converter taphole 3 is blocked to skimming ball 4
When, tapping terminates.
Claims (5)
1. powder dephosphorization realizes the device of pushing off the slag simultaneously above a kind of converter taphole, which is characterized in that the converter tapping
Powder dephosphorization realizes that the device of pushing off the slag includes mobile system, air supply system (11), control system, powder spraying system simultaneously above mouthful
(10) and slag-blocking system；
The mobile system includes lifting device (6) and moving device (7)；The lifting device (6) is fixedly mounted on control
On the console (9) of system processed, the discharge tube (5) of powder spraying system (10) is fixed on the crossbeam of slag-blocking system, and crossbeam is mounted on
On lifting device (6), the lifting of crossbeam and discharge tube (5) is controlled by lifting device (6)；The moving device (7) is fixed
It is connected on lifting device (6) and with the crossbeam of slag-blocking system, a left side for crossbeam and discharge tube (5) is controlled by moving device (7)
It moves right, the skimming ball (4) of the flush type spray gun and slag-blocking system of finally realizing discharge tube (5) end is in converter taphole (3)
The adjustment of top position；
The control system includes console (9) and control device, the console (9) surface-based rail (8)
On, console (9) is moved left and right along rail (8)；The control device is mounted in console (9), and with moving device (7)
It is connected with lifting device (6), to control the lifting of mobile system and move left and right, to realize flush type spray gun and skimming ball
(4) it lifting and moves left and right；
The air supply system (11) includes air accumulator (12) and air-flow distributor (13)；The air accumulator (12) and air-flow point
Orchestration (13) is connected by pipeline, and pipeline between the two is equipped with total valve (22)；It is separated from air-flow distributor (13)
Three gas circuits, wherein the first gas circuit is connect with the powder spraying pot (16) of powder spraying system (10), and the first gas circuit is equipped with the first gas circuit valve
Door (19) and first pressure gauge (23)；Second gas circuit is connect with the fluidising chamber (15) of powder spraying system (10), and the second gas circuit is equipped with
Second gas circuit valve (20) and second pressure gauge (24)；Third gas circuit is connect with the gas powder mixing chamber (14) of powder spraying system (10),
Third gas circuit is equipped with third gas circuit valve (21) and third pressure gauge (25)；And flowmeter is housed in each gas circuit；
The powder spraying system (10) includes powder spraying pot (16), discharge tube (5), the gentle powder mixing chamber (14) of fluidising chamber (15)；Institute
For storing Dephosphorising agent, powder spraying pot (16) is located above fluidising chamber (15) powder spraying pot (16) stated, the bottom of powder spraying pot (16) and
The top of fluidising chamber (15) is connected by pipeline, and pipeline between the two is equipped with the first baiting valve (17)；The fluidisation
The bottom of room (15) is connected with the top of gas powder mixing chamber (14) by pipeline, and pipeline between the two is equipped with the second blanking
Valve (18)；The gas powder mixing chamber (14), one side and third air circuit connection, one end phase of the other side and discharge tube (5)
Even, discharge tube (5) and the crossbeam binding of slag-blocking system are integrated；The discharge tube (5), the other end are divided into two branches,
Two branches are at an angle to each other, and the end of each branch is equipped with flush type spray gun, by the adjustment of mobile system, spray flush type
Rifle is immersed in the top in molten steel (2) and being located at converter taphole (3)；
The slag-blocking system is placed in using dispensing skimming ball technology, including skimming ball (4) and crossbeam, the skimming ball (4)
The front end of crossbeam, skimming ball (4) are located on clinker and are located at the top in gap between two flush type spray guns, when release, gear
Slag ball (4) is fallen into molten steel (2) from the gap among two flush type spray guns；When tap reaches 2/3~3/4, by crossbeam
On skimming ball (4) release put into molten steel (2), the density of skimming ball (4) between vessel slag and molten steel (2), beginning
Float on slag gold interface, with the reduction of molten steel (2), eventually fall in converter taphole (3), realizes pushing off the slag.
2. powder dephosphorization realizes the device of pushing off the slag, feature simultaneously above a kind of converter taphole according to claim 1
It is, the material of the discharge tube (5) is refractory material.
3. powder dephosphorization realizes the device of pushing off the slag simultaneously above a kind of converter taphole according to claim 1 or 2, special
Sign is that the gas in the air accumulator (12) is inert gas.
4. a kind of method that powder dephosphorization realizes pushing off the slag simultaneously above converter taphole, using any converter of right 1-3
Powder dephosphorization realizes the device of pushing off the slag simultaneously above tapping hole, which is characterized in that specific step is as follows:
(1) powder dephosphorization above converter taphole is realized to the console (9) of the device of pushing off the slag is mounted on rail (8) simultaneously,
Keep whole device mobile along rail (8)；
(2) when converter grate starts tapping, the mobile system of the rotary system of converter and device is cooperated, movement is passed through
The lifting of lifting device (6) and moving device (7) move left and right in system, in adjustment powder spraying system (10) flush type spray gun and
The position of skimming ball (4) in slag-blocking system is immersed in flush type spray gun in molten steel (2) and is located at the upper of converter taphole (3)
Side, skimming ball (4) are located at the top on clinker and being located at gap between two flush type spray guns；Close powder spraying system (10)
All valves open the total valve (22) and third gas circuit valve (21) of air supply system (11), the indifferent gas in air accumulator (12)
Body is by successively entering Converter by gas powder mixing chamber (14), discharge tube (5) and flush type spray gun after air-flow distributor (13)
Body (1), adjusting throughput be 40~60L/min, 0.5~1.0MPa of jetting pressure, at this time air supply system (11) to molten steel (2) into
Row, which is blown, to be stirred, and Dephosphorising agent does not enter in molten steel (2)；
(3) blow after stablizing, open the first gas circuit valve (19) and the first baiting valve (17), make Dephosphorising agent from powder spraying pot (16) into
Enter in fluidising chamber (15)；After closing the first baiting valve (17), the second gas circuit valve (20) is opened, the second gas circuit carries out Dephosphorising agent
Fluidisation, the second baiting valve (18) between fluidising chamber (15) and gas powder mixing chamber (14) are in off state；
(4) Dephosphorising agent sufficiently fluidizes in fluidising chamber (15), when fluidising chamber (15) interior pressure is greater than gas powder mixing chamber (14), beats
The second baiting valve (18) opened between fluidising chamber (15) and gas powder mixing chamber (14) blows Dephosphorising agent under the action of carrier gas stream
Enter converter body (1), powder dephosphorization is carried out to molten steel (2), gas flow is adjusted to 80~100L/min, and powder to air ratio is 1~10；
And according to the rotation angle of furnace body of walking around (1), the position of flush type spray gun is adjusted at any time, flush type spray gun is made to be in furnace always
Under slag interface, powder dephosphorization is carried out to molten steel (2)；
(5) when tap reaches between 2/3~3/4, the skimming ball (4) of slag-blocking system is discharged, due to the density of skimming ball (4)
Between molten steel (2) and clinker, skimming ball (4) is suspended in slag gold interface, and continuing to dust carries out dephosphorization to molten steel (2)；
(6) when converter body (1) rotates 80~85 °, the first gas circuit valve (19) and the second gas circuit valve (20) are successively closed,
Stop blowing, whole device is removed, third gas circuit valve (21) is turned off；Converter taphole (3) are blocked to skimming ball (4)
When, tapping terminates.
5. the method that powder dephosphorization realizes pushing off the slag simultaneously above a kind of converter taphole according to claim 4, feature
It is, the Dephosphorising agent is CaO and CaF2；The granularity of the Dephosphorising agent is 400~600 mesh.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112226576A (en) * | 2020-09-27 | 2021-01-15 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Device and method for carbon spraying deoxidation by using slag stopping system |
| CN112941269A (en) * | 2021-02-04 | 2021-06-11 | 东北大学 | Bottom-spraying deep dephosphorization method adopting composite dephosphorization agent in later stage of converter |
| CN113832286A (en) * | 2021-09-17 | 2021-12-24 | 东北大学 | Device and method for powder injection dephosphorization and slag blocking at converter steel tapping hole and composite dephosphorization agent |
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| CN112941269A (en) * | 2021-02-04 | 2021-06-11 | 东北大学 | Bottom-spraying deep dephosphorization method adopting composite dephosphorization agent in later stage of converter |
| CN113832286A (en) * | 2021-09-17 | 2021-12-24 | 东北大学 | Device and method for powder injection dephosphorization and slag blocking at converter steel tapping hole and composite dephosphorization agent |
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