CN109880965B - Device and method for powder injection dephosphorization and simultaneous slag blocking above converter steel tapping hole - Google Patents
Device and method for powder injection dephosphorization and simultaneous slag blocking above converter steel tapping hole Download PDFInfo
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Abstract
The invention belongs to the technical field of converter steelmaking, and relates to a device and a method for powder injection dephosphorization above a converter steel-tapping hole and simultaneously realizing slag blocking. The device comprises a moving system, an air supply system, a control system, a powder spraying system and a slag blocking system. The method comprises the following steps: in the converter tapping process, an embedded spray gun is arranged above a converter tapping hole, and the spray gun is connected with a gas supply system and a powder spraying system and is used for blowing in inert gas and a dephosphorizing agent; when the tapping of the converter starts, the moving system controls the advancing and the lifting of the spray gun to ensure that the spray gun is immersed in the molten steel to reach the upper part of a tapping hole and ensure that a slag stopping ball is positioned above a slag surface; in the last stage of converter tapping, when the tapping amount reaches 2/3-3/4, the slag blocking ball is put into the molten steel to realize the slag blocking function, improve the utilization rate of the dephosphorizing agent and improve the yield of the molten steel; and after tapping, stopping gas injection, and moving the spray gun out of the converter through the moving device. The device has the advantages of simple structure, convenient operation and strong practical application value.
Description
Technical Field
The invention belongs to the technical field of converter steelmaking, and particularly relates to a device and a method for powder injection dephosphorization above a converter steel-tapping hole and slag blocking.
Background
Impurities in the steel can change the performance of the steel and reduce the quality of the steel. Phosphorus, as a surface active impurity, is easily segregated at grain boundaries, causing low-temperature brittleness and reducing the toughness and the heat deformability of the steel. Many high-quality steel products have strict requirements on phosphorus content, so the method has important significance on molten steel dephosphorization and is a research hotspot of domestic and foreign scholars all the time.
The removal of phosphorus in the steel production process is mainly carried out in two stages of molten iron pretreatment and converter or electric furnace oxidation period. The converter dephosphorization load can be reduced by the molten iron dephosphorization pretreatment, but the molten iron dephosphorization pretreatment mainly comprises powder injection dephosphorization in a molten iron tank, the volume is limited, the shape is not favorable for slag-metal reaction, the dephosphorization efficiency is low (only can reach 65-70%), the carbon content of the obtained semisteel is 3.0-3.4%, and the later stage decarburization heat is insufficient.
The converter internal dephosphorization process mainly utilizes converter slag to carry out oxidation dephosphorization on molten steel, and the converter dephosphorization process mainly comprises a single slag method, a converter duplex dephosphorization process and a dephosphorization gun/decarburization gun duplex dephosphorization process. The company also researches the deep dephosphorization of molten steel by using converter smelting and tapping dephosphorization.
In the process, the dephosphorization is carried out by adopting a duplex method, the dephosphorization rate of the whole process can reach 91.7%, the lime consumption and the iron loss can be reduced, but because two times of steel tapping are needed, the heat loss is large, and the coal gas is not recovered during the dephosphorization period, so that the recovery amount of the coal gas is reduced.
By adopting the dephosphorization technique of dephosphorization gun/decarburization gun double slag, the dephosphorization rate of the whole technique reaches 93.8 percent, and the consumption of ton steel lime can be reduced. But the dephosphorization gun occupies the gun position, can not use the standby gun, needs to change the gun operation, and has certain influence on production.
The converter smelting and steel tapping dephosphorization process is adopted, after molten steel enters a steel ladle, a dephosphorization agent is added, dephosphorization is carried out by utilizing the dynamic condition of good falling of the molten steel, the dephosphorization rate of the method is highest, and the dephosphorization rate of the whole process can reach 97.5%. However, after dephosphorization of the ladle, the ladle needs to be refined by removing the dephosphorization residues, and slag skimming or molten steel ladle pouring are needed to the ladle, which brings difficulty to the production process.
The converter slag contains iron oxide, manganese oxide, silicon dioxide and other components, and the components can adversely affect the quality of molten steel. At the final stage of tapping, confluence vortex, drainage sink pit and the like can be generated above the tapping hole, so that converter slag flows into a steel ladle, the yield of molten steel is reduced, the service life of refractory materials is shortened, and the industrial production efficiency is seriously influenced.
In order to reduce the amount of steel slag flowing out of a steel ladle from a steel tapping hole of a converter, steel enterprises generally adopt methods of putting slag blocking balls, slag blocking plugs, pneumatic slag blocking and the like to reduce slag tapping.
Disclosure of Invention
In order to solve the technical problems, the invention provides a device and a method for powder injection dephosphorization above a converter steel-tapping hole and simultaneously realizing slag blocking.
The technical scheme of the invention is as follows:
a device for spraying powder and dephosphorizing and simultaneously realizing slag blocking above a converter steel tapping hole comprises a moving system, an air supply system 11, a control system, a powder spraying system 10 and a slag blocking system.
The moving system comprises a lifting device 6 and a traveling device 7; the lifting device 6 is fixedly arranged on a control console 9 of the control system, the powder spraying pipe 5 of the powder spraying system 10 is fixed on a beam of the slag stopping system, the beam is arranged on the lifting device 6, and the lifting of the beam and the powder spraying pipe 5 is controlled by the lifting device 6; the traveling device 7 is fixed on the lifting device 6 and connected with a cross beam of the slag stopping system, and the traveling device 7 controls the cross beam and the powder spraying pipe 5 to move left and right, so that the embedded spray gun at the end part of the powder spraying pipe 5 and the slag stopping ball 4 of the slag stopping system are finally adjusted above the converter steel tapping hole 3;
the control system comprises a control console 9 and a control device, wherein the control console 9 is installed on a rail 8 on the ground, and the control console 9 moves left and right along the rail 8; the control device is arranged in the control console 9 and is connected with the traveling device 7 and the lifting device 6 so as to control the lifting and the left-right movement of the moving system, thereby realizing the lifting and the left-right movement of the embedded spray gun and the slag stopping ball 4;
the gas supply system 11 comprises a gas storage tank 12 and a gas flow distributor 13; the air storage tank 12 is communicated with the airflow distributor 13 through a pipeline, and a main valve 22 is arranged on the pipeline between the air storage tank and the airflow distributor; three gas paths are separated from the airflow distributor 13, wherein a first gas path is connected with a powder spraying tank 16 of the powder spraying system 10, and a first gas path valve 19 and a first pressure gauge 23 are arranged on the first gas path; the second gas path is connected with the fluidization chamber 15 of the powder spraying system 10, and a second gas path valve 20 and a second pressure gauge 24 are arranged on the second gas path; the third gas path is connected with the gas-powder mixing chamber 14 of the powder spraying system 10, and a third gas path valve 21 and a third pressure gauge 25 are arranged on the third gas path; each branch gas circuit is provided with a flowmeter;
the powder spraying system 10 comprises a powder spraying tank 16, a powder spraying pipe 5, a fluidizing chamber 15 and a gas-powder mixing chamber 14; the powder spraying tank 16 is used for storing a dephosphorizing agent, the powder spraying tank 16 is positioned above the fluidizing chamber 15, the bottom of the powder spraying tank 16 is communicated with the top of the fluidizing chamber 15 through a pipeline, and a first baiting valve 17 is arranged on the pipeline between the powder spraying tank 16 and the fluidizing chamber 15; the bottom of the fluidizing chamber 15 is communicated with the top of the gas-powder mixing chamber 14 through a pipeline, and a second blanking valve 18 is arranged on the pipeline between the bottom of the fluidizing chamber and the top of the gas-powder mixing chamber; one side of the gas-powder mixing chamber 14 is connected with the third gas path, the other side of the gas-powder mixing chamber is connected with one end of a powder spraying pipe 5, and the powder spraying pipe 5 and a beam of the slag stopping system are bound into a whole; the other end of the powder spraying pipe 5 is divided into two branches, the two branches form an angle with each other, an embedded spray gun is installed at the end part of each branch, and the embedded spray gun is immersed into the molten steel 2 and is positioned above a converter steel tapping hole 3 through adjustment of a moving system;
the slag stopping system adopts a technology of putting slag stopping balls and comprises the slag stopping balls 4 and a cross beam, wherein the slag stopping balls 4 are arranged at the front end of the cross beam, the slag stopping balls 4 are positioned above slag and above a gap between two embedded spray guns, and when the slag stopping balls 4 are released, the slag stopping balls 4 fall into molten steel 2 from the gap between the two embedded spray guns; when the steel tapping amount reaches 2/3-3/4, the slag stopping balls 4 on the beam are released and put into the molten steel 2, the density of the slag stopping balls 4 is between that of the converter slag and the molten steel 2, the slag stopping balls begin to float on a slag-metal interface, and the slag stopping balls finally fall into a converter steel tapping hole 3 along with the reduction of the molten steel 2, so that slag stopping is realized.
The powder spraying pipe 5 is made of refractory materials.
The gas in the gas storage tank 12 is inert gas, such as argon and nitrogen.
A method for powder injection dephosphorization and simultaneous slag blocking above a converter steel tapping hole comprises the following specific steps:
(1) a control console 9 of the device for spraying powder and dephosphorizing above the converter steel tapping hole and simultaneously realizing slag blocking is arranged on the rail 8, so that the whole device moves along the rail 8;
(2) when the converter shaking starts to tap steel, a rotating system of the converter and a moving system of the device are matched with each other, the positions of an embedded type spray gun in a powder spraying system 10 and a slag blocking ball 4 in a slag blocking system are adjusted through the lifting of a lifting device 6 in the moving system and the left and right movement of a moving device 7, the embedded type spray gun is immersed in molten steel 2 and is positioned above a steel tapping hole 3 of the converter, the slag blocking ball 4 is positioned above slag and is positioned above a gap between the two embedded type spray guns, all valves of the powder spraying system 10 are closed, a main valve 22 and a third gas circuit valve 21 of a gas supply system 11 are opened, inert gas in a gas storage tank 12 passes through a gas flow distributor 13 and then sequentially passes through a gas-powder mixing chamber 14, a powder spraying pipe 5 and the embedded type spray gun to enter a converter body 1, the gas flow is adjusted to be 40-60L/min, the spraying pressure is 0.5-1.0 MPa, the gas supply system 11 blows and;
(3) after the stable blowing, opening a first gas circuit valve 19 and a first blanking valve 17 to enable the dephosphorization agent to enter the fluidization chamber 15 from the powder spraying tank 16, closing the first blanking valve 17, opening a second gas circuit valve 20, fluidizing the dephosphorization agent by a second gas circuit, and closing a second blanking valve 18 between the fluidization chamber 15 and the gas-powder mixing chamber 14;
(4) fully fluidizing the dephosphorization agent in the fluidizing chamber 15, opening a second blanking valve 18 between the fluidizing chamber 15 and the gas-powder mixing chamber 14 when the pressure in the fluidizing chamber 15 is greater than the pressure in the gas-powder mixing chamber 14, blowing the dephosphorization agent into the converter body 1 under the action of carrier gas flow, spraying powder and dephosphorizing the molten steel 2, adjusting the gas flow to 80-100L/min and the powder-gas ratio to 1-10, adjusting the position of the embedded spray gun at any time according to the rotation angle of the converter body 1, enabling the embedded spray gun to be always positioned below a slag interface, and spraying powder and dephosphorizing the molten steel 2;
(5) when the steel tapping amount reaches 2/3-3/4, releasing slag stopping balls 4 of a slag stopping system, suspending the slag stopping balls 4 at a slag-metal interface because the density of the slag stopping balls 4 is between that of the molten steel 2 and slag, and continuously spraying powder to dephosphorize the molten steel 2;
(6) when the converter body 1 rotates by 80-85 degrees, the first air path valve 19 and the second air path valve 20 are closed in sequence, blowing is stopped, the whole device is moved out, and then the third air path valve 21 is closed; and finishing tapping when the slag stopping ball 4 blocks the converter tapping hole 3.
The described stripperThe phosphorus agent is CaO and CaF2。
The particle size of the dephosphorizing agent is 400-600 meshes.
Compared with the prior art, the invention has the beneficial effects that:
(1) the invention further utilizes powder injection stirring dephosphorization on the basis of the converter dephosphorization process, reduces the phosphorus content in the molten steel and further improves the quality of the molten steel;
(2) compared with the pure inert gas blowing, the powder injection method has the advantages that solid particles in the molten steel are increased, the molten steel is blown to be stirred, and the gas content in the molten steel is reduced;
(3) a powder spraying device is arranged above a steel tapping hole of the converter, inert gas is used as carrier gas, a dephosphorizing agent is sprayed into molten steel when steel is tapped at the end point of the converter, and the powder spraying and dephosphorizing process and the blowing and slag stopping process are organically combined. By utilizing the gas stirring effect, good dynamic conditions are formed, the dephosphorization effect is enhanced, the quality of molten steel is improved, the production period is shortened, the yield of the dephosphorization agent is improved, and the amount of slag entering a steel ladle is effectively reduced.
(4) The device has strong controllability and can be adjusted at any time according to field conditions.
Drawings
FIG. 1 is a flow chart of a method for powder injection dephosphorization above a converter steel-tapping hole and simultaneous slag removal;
FIG. 2 is a schematic diagram of the overall structure of a device for powder injection dephosphorization above a converter steel-tapping hole and simultaneously realizing slag removal;
FIG. 3 is a partial schematic view of a powder injection system and a slag-stopping system of a device for injecting powder and removing phosphorus above a steel-tapping hole of a converter and simultaneously realizing slag stopping;
fig. 4 is a schematic structural diagram of the powder spraying system and the gas supply system.
Wherein: 1, a converter body; 2, molten steel; 3, a converter steel tapping hole; 4, stopping slag balls; 5, a powder spraying pipe; 6, a lifting device; 7 a traveling device; 8, rails; 9 a console; 10, a powder spraying system; 11 an air supply system; 12 air storage tank; 13 an airflow distributor; 14 gas-powder mixing chamber; 15 a fluidizing chamber; 16 powder spraying tank; 17 a first blanking valve; 18 a second discharge valve; 19 a first gas path valve; 20 a second gas path valve; 21 a third gas path valve; 22 a main valve; 23 a first pressure gauge; 24 a second pressure gauge; 25 third pressure gauge.
Detailed Description
The following further describes a specific embodiment of the present invention with reference to the drawings and technical solutions.
As shown in fig. 2-4, the device for powder injection and dephosphorization above the steel-tapping hole of the converter and simultaneously realizing slag blocking comprises a moving system, a gas supply system 11, a control system, a powder injection system 10 and a slag blocking system.
The moving system comprises a lifting device 6 and a traveling device 7; the control system comprises a control console 9 and a control device; the gas supply system 11 comprises a gas storage tank 12 and a gas flow distributor 13; the powder spraying system 10 comprises a powder spraying tank 16, a powder spraying pipe 5, a fluidizing chamber 15 and a gas-powder mixing chamber 14; the slag stopping system adopts the technology of putting slag stopping balls and comprises the slag stopping balls 4 and a cross beam.
As shown in fig. 1, a method for powder injection dephosphorization and simultaneous slag removal above a converter tap hole specifically comprises the following steps:
(1) a rail 8 is paved on the ground, a control console 9 of the device for spraying powder and dephosphorizing above the converter steel tapping hole and simultaneously realizing slag blocking is arranged on the rail 8, and the whole device moves along the rail 8; powering on each system;
(2) when the converter is shaken to tap steel, a rotating system of the converter is coupled with a moving system of the device, the positions of the embedded type spray gun and the slag blocking ball 4 are adjusted through the lifting of the lifting device 6 in the moving system and the movement of the moving device 7 along with the different rotating angles in the tapping process of the converter, the embedded type spray gun is always positioned below a steel slag interface and above a steel tapping hole 3 of the converter, the slag blocking ball 4 is always positioned above the steel slag interface, all valves of the powder spraying system 10 are closed, a main valve 22 and a third gas circuit valve 21 of the gas supply system 11 are opened, argon in the gas storage tank 12 passes through the gas distributor 13 and then sequentially passes through the gas-powder mixing chamber 14, the powder spraying pipe 5 and the embedded type spray gun to enter the converter body 1, the gas flow is adjusted to be 50L/min, the spraying pressure is 0.75MPa, at the moment, the dephosphorization agent does not enter the molten steel 2, the gas supply system 11 blows and stirs the molten steel 2;
(3) after the stable blowing, opening a first gas path valve 19 and a first blanking valve 17, enabling a dephosphorizing agent with the granularity of 500 meshes to enter a fluidizing chamber 15 from a powder spraying tank 16, closing the first blanking valve 17, opening a second gas path valve 20, fluidizing the dephosphorizing agent by a second gas path, and at the moment, closing a second blanking valve 18 between the fluidizing chamber 15 and a gas-powder mixing chamber 14;
(4) fully fluidizing the dephosphorizing agent in the fluidizing chamber 15, opening a second blanking valve 18 between the fluidizing chamber 15 and the gas-powder mixing chamber 14 when the pressure in the fluidizing chamber 15 is greater than the pressure in the gas-powder mixing chamber 14, blowing the dephosphorizing agent into the converter body 1 under the action of carrier gas flow, spraying powder and dephosphorizing the molten steel 2, adjusting the gas flow to 90L/min, and controlling the powder-gas ratio to 5;
(5) releasing the slag stopping balls 4 when the steel tapping amount reaches 2/3-3/4, suspending the slag stopping balls 4 on a steel slag interface because the density of the slag stopping balls 4 is between that of molten steel and slag, and continuously spraying powder to dephosphorize the molten steel 2 in the period;
(6) when the converter body 1 rotates by 80-85 degrees, the first gas path valve 19 and the second gas path valve 20 are closed in sequence, powder spraying and blowing are stopped, the whole device is moved out of the converter, and then the third gas path valve 21 is closed. And finishing tapping when the slag stopping ball 4 blocks the converter tapping hole 3.
Claims (5)
1. The device for powder injection dephosphorization and simultaneous slag stopping above the steel tapping hole of the converter is characterized by comprising a mobile system, a gas supply system (11), a control system, a powder injection system (10) and a slag stopping system;
the moving system comprises a lifting device (6) and a traveling device (7); the lifting device (6) is fixedly arranged on a control console (9) of the control system, a powder spraying pipe (5) of the powder spraying system (10) is fixed on a beam of the slag stopping system, the beam is arranged on the lifting device (6), and the lifting of the beam and the powder spraying pipe (5) is controlled through the lifting device (6); the traveling device (7) is fixed on the lifting device (6) and connected with a cross beam of the slag stopping system, and the traveling device (7) controls the cross beam and the powder spraying pipe (5) to move left and right, so that the embedded spray gun at the end part of the powder spraying pipe (5) and the slag stopping ball (4) of the slag stopping system are finally adjusted above the converter steel tapping hole (3);
the control system comprises a control console (9) and a control device, wherein the control console (9) is installed on a rail (8) on the ground, and the control console (9) moves left and right along the rail (8); the control device is arranged in the control console (9) and is connected with the traveling device (7) and the lifting device (6) to control the lifting and the left-right movement of the moving system, so that the lifting and the left-right movement of the embedded spray gun and the slag stopping ball (4) are realized;
the air supply system (11) comprises an air storage tank (12) and an air flow distributor (13); the air storage tank (12) is communicated with the airflow distributor (13) through a pipeline, and a main valve (22) is arranged on the pipeline between the air storage tank and the airflow distributor; three gas paths are divided from the airflow distributor (13), wherein a first gas path is connected with a powder spraying tank (16) of the powder spraying system (10), and a first gas path valve (19) and a first pressure gauge (23) are arranged on the first gas path; the second gas path is connected with a fluidization chamber (15) of the powder spraying system (10), and a second gas path valve (20) and a second pressure gauge (24) are arranged on the second gas path; the third gas path is connected with a gas-powder mixing chamber (14) of the powder spraying system (10), and a third gas path valve (21) and a third pressure gauge (25) are arranged on the third gas path; each branch gas circuit is provided with a flowmeter;
the powder spraying system (10) comprises a powder spraying tank (16), a powder spraying pipe (5), a fluidizing chamber (15) and a gas-powder mixing chamber (14); the powder spraying tank (16) is used for storing a dephosphorizing agent, the powder spraying tank (16) is positioned above the fluidizing chamber (15), the bottom of the powder spraying tank (16) is communicated with the top of the fluidizing chamber (15) through a pipeline, and a first blanking valve (17) is arranged on the pipeline between the powder spraying tank and the fluidizing chamber; the bottom of the fluidization chamber (15) is communicated with the top of the gas-powder mixing chamber (14) through a pipeline, and a second blanking valve (18) is arranged on the pipeline between the fluidization chamber and the gas-powder mixing chamber; one side of the gas-powder mixing chamber (14) is connected with the third gas path, the other side of the gas-powder mixing chamber is connected with one end of a powder spraying pipe (5), and the powder spraying pipe (5) and a beam of the slag stopping system are bound into a whole; the other end of the powder spraying pipe (5) is divided into two branches, the two branches form an angle with each other, an embedded spray gun is installed at the end part of each branch, and the embedded spray gun is immersed into the molten steel (2) and is positioned above a converter steel tapping hole (3) through adjustment of a moving system;
the slag stopping system adopts a slag stopping ball throwing technology and comprises a slag stopping ball (4) and a cross beam, wherein the slag stopping ball (4) is arranged at the front end of the cross beam, the slag stopping ball (4) is positioned above slag and above a gap between two embedded spray guns, and when the slag stopping ball (4) is released, the slag stopping ball falls into molten steel (2) from the gap between the two embedded spray guns; when the steel tapping amount reaches 2/3-3/4, the slag stopping balls (4) on the cross beam are released and put into the molten steel (2), the density of the slag stopping balls (4) is between that of the converter slag and the molten steel (2), the slag stopping balls begin to float on a steel slag interface, and the slag stopping balls finally fall into a converter steel tapping hole (3) along with the reduction of the molten steel (2), so that slag stopping is achieved.
2. Device for powder injection dephosphorization and simultaneous slag skimming above the tapping hole of a converter according to claim 1, characterized in that the material of the powder injection pipe (5) is refractory.
3. The device for powder injection dephosphorization and simultaneous slag removal above the tapping hole of the converter according to claim 1 or 2, characterized in that the gas in the gas storage tank (12) is inert.
4. A method for powder injection dephosphorization and simultaneous slag removal above a converter tap hole adopts the device for powder injection dephosphorization and simultaneous slag removal above the converter tap hole according to any one of claims 1 to 3, and is characterized by comprising the following specific steps:
(1) a control console (9) of the device for spraying powder and dephosphorizing above the converter steel tapping hole and simultaneously realizing slag blocking is arranged on the rail (8), so that the whole device moves along the rail (8);
(2) when the converter shaking starts to tap steel, a rotating system of the converter and a moving system of the device are matched with each other, the positions of an embedded type spray gun in a powder spraying system (10) and a slag blocking ball (4) in the slag blocking system are adjusted through the lifting of a lifting device (6) in the moving system and the left-right movement of a moving device (7), the embedded type spray gun is immersed in the molten steel (2) and is positioned above a steel tapping hole (3) of the converter, the slag blocking ball (4) is positioned above slag and is positioned above a gap between the two embedded type spray guns, all valves of the powder spraying system (10) are closed, a main valve (22) and a third gas circuit valve (21) of the gas supply system (11) are opened, inert gas in a gas storage tank (12) passes through an air flow distributor (13) and then sequentially passes through a gas-powder mixing chamber (14), a powder spraying pipe (5) and the embedded type spray gun to enter a converter body (1), the flow rate is adjusted to be 40-60L/min, the spraying pressure is 0.5-1.0 MPa, the gas supply system (11) blows and stirs the;
(3) after the gas blowing is stable, opening a first gas circuit valve (19) and a first blanking valve (17) to enable the dephosphorization agent to enter a fluidization chamber (15) from a powder spraying tank (16); after the first blanking valve (17) is closed, a second gas path valve (20) is opened, the second gas path fluidizes the dephosphorizing agent, and a second blanking valve (18) between the fluidizing chamber (15) and the gas-powder mixing chamber (14) is in a closed state;
(4) fully fluidizing the dephosphorization agent in the fluidizing chamber (15), opening a second blanking valve (18) between the fluidizing chamber (15) and the gas-powder mixing chamber (14) when the pressure in the fluidizing chamber (15) is greater than the gas-powder mixing chamber (14), blowing the dephosphorization agent into the converter body (1) under the action of carrier gas flow, spraying powder and dephosphorizing the molten steel (2), adjusting the gas flow to be 80-100L/min and the powder-gas ratio to be 1-10, adjusting the position of the embedded type spray gun at any time according to the rotation angle of the converter body (1) to enable the embedded type spray gun to be always positioned below a steel slag interface, and spraying powder and dephosphorizing the molten steel (2);
(5) when the steel tapping amount reaches 2/3-3/4, releasing slag blocking balls (4) of a slag blocking system, suspending the slag blocking balls (4) at a steel slag interface because the density of the slag blocking balls (4) is between that of the molten steel (2) and slag, and continuously spraying powder to dephosphorize the molten steel (2);
(6) when the converter body (1) rotates by 80-85 degrees, the first gas path valve (19) and the second gas path valve (20) are closed in sequence, blowing is stopped, the whole device is moved out, and then the third gas path valve (21) is closed; and finishing tapping when the slag stopping ball (4) blocks the converter tapping hole (3).
5. The method for powder injection dephosphorization and simultaneous slag removal over a converter tap hole according to claim 4, wherein the dephosphorization agent is CaO and CaF2(ii) a The particle size of the dephosphorizing agent is 400-600 meshes.
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| CN112226576B (en) * | 2020-09-27 | 2023-07-14 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Device and method for carbon spraying and deoxidizing by utilizing slag blocking 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 |
| CN113832286B (en) * | 2021-09-17 | 2023-01-17 | 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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