CN111676343B - Multifunctional oxygen lance system for converter steelmaking and steelmaking method - Google Patents
Multifunctional oxygen lance system for converter steelmaking and steelmaking method Download PDFInfo
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- CN111676343B CN111676343B CN202010532438.XA CN202010532438A CN111676343B CN 111676343 B CN111676343 B CN 111676343B CN 202010532438 A CN202010532438 A CN 202010532438A CN 111676343 B CN111676343 B CN 111676343B
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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
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/42—Constructional features of converters
- C21C5/46—Details or accessories
- C21C5/4606—Lances or injectors
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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
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/30—Regulating or controlling the blowing
- C21C5/32—Blowing from above
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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
- C21C7/0025—Adding carbon 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
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- 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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- 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
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/40—Production or processing of lime, e.g. limestone regeneration of lime in pulp and sugar mills
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Abstract
The invention belongs to the technical field of steel smelting, and particularly relates to a multifunctional oxygen lance system for converter steelmaking and a steelmaking method, which are suitable for 30-350t converter steelmaking. The method uses a four-layer oxygen lance internally provided with a powder spraying pipe, carbon powder, anthracite powder or lime powder is selectively sprayed on a central pipe according to process conditions, and N is used as carrier gas2/Ar/CO2Or the mixed gas of several gases, oxygen gun gas pipeline selectively blows O according to different smelting processes2/CO2Or the mixed gas of the two gases, the carbon powder or the anthracite powder injected into the inner layer pipe can increase the heat of a converter molten pool and improve the scrap steel ratio, and the lime powder injected into the inner layer pipe can improve the dephosphorization and desulfurization efficiency of the converter and reduce the end point carbon oxygen deposit. Compared with the traditional oxygen lance smelting method, the oxygen lance system has higher flexibility, is suitable for various smelting process requirements, realizes the increase of the scrap steel ratio by more than 10 percent, can reduce the lime consumption by more than 10 percent, can reduce the iron and steel material consumption by more than 3kg, and can realize the comprehensive economic benefit of 15 yuan/t steel.
Description
Technical Field
The invention belongs to the technical field of steel smelting, and particularly relates to a multifunctional oxygen lance system for converter steelmaking and a steelmaking method.
Background
At present, the proportion of the yield of crude steel smelted by a converter in China is up to 90%, the quantity of scrap steel is gradually increased year by year, steel enterprises achieve the purposes of reducing the consumption of steel materials and increasing the yield by increasing the adding quantity of the scrap steel ratio of the converter, but the overlarge scrap steel ratio cannot meet the heat balance of converter smelting, so that the surplus heat of converter smelting is increased by adopting various ways. At present, the ways of increasing the scrap ratio mainly include: preheating scrap steel, supplementing a heating agent (coal, carbon powder and siliceous heating agent) into a storage bin and carrying out secondary combustion. The above methods of increasing the scrap ratio have certain problems: the preheating of the scrap steel needs to be equipped with special equipment, and the energy is lost and the environmental pollution is caused in the baking process of the scrap steel; the heat recovery efficiency of the temperature raising agent replenished in the storage bin is very low, and the price of the siliceous temperature raising agent is higher; the secondary combustion can only increase the scrap steel ratio to a certain extent and reduce the heat value of the converter gas.
In recent years, China pays great attention to the development of variety steel, and puts higher requirements on smelting process and equipment of a converter. At present, various slag formers are added into a material tank for converter smelting, wherein the addition of lime has great influence on the removal of harmful elements such as phosphorus, sulfur and the like, and the addition amount of each ton of steel is 28-45 kg/t. During the process of adding lime from the trough, the lime crushed into powder is sucked by a fan to cause loss, and the specific surface area of the lime block added into the molten pool is large, so that the lime block can only be stirred by oxygen jet flow to dissolve the molten pool and form slag.
At present, the multifunctional oxygen lance system and the steel-making method which can meet the requirements of blowing carbon powder or anthracite powder to improve the ratio of steel scrap in converter smelting and can be combined with the efficient smelting of blowing lime powder are only reported at home and abroad, so that the multifunctional oxygen lance system and the steel-making method for converter steelmaking provided by the invention have the advantages of reducing the production cost, increasing the ratio of steel scrap, efficiently smelting and improving the product quality.
Disclosure of Invention
The invention provides a multifunctional oxygen lance system for converter steelmaking and a steelmaking method, and aims to reduce the production cost, increase the scrap steel ratio, efficiently smelt and improve the product quality
The invention is realized by the following technical scheme:
a multifunctional oxygen lance system for converter steelmaking is characterized in that the oxygen lance system consists of a converter, a multifunctional oxygen lance nozzle, a heating powder injection tank, a lime powder injection tank, a powder conveying pipeline, a metal hose and a powder injection channel; the oxygen lance comprises a powder spraying channel, a main blowing channel, a water inlet channel and a water outlet channel; the temperature-rising powder injection tank and the lime powder injection tank are connected with the powder conveying pipeline, the powder conveying pipeline is connected with the metal hose, the metal hose is connected with the powder injection channel, the powder injection channel is connected with the multifunctional oxygen lance nozzle, the powder conveying pipeline is arranged in the center of the main blowing channel, and a part of the multifunctional oxygen lance and the multifunctional oxygen lance nozzle are arranged in the converter when in use.
Furthermore, the multifunctional oxygen lance nozzle (3) is made of copper and steel, the spray holes are arranged in the form of a central single hole and peripheral multiple holes, wherein the Mach number of the central single hole is 1.0-2.1, the angle of alpha 1 is 0-60 degrees, and the flow range is 100-40000Nm3H, the number of peripheral porous holes is 3-12, the Mach number is 1.5-2.4, the angle of a half cone angle alpha 2 of the spray hole expansion section is 2-10 degrees, and the included angles alpha 3 and alpha 4 between the spray hole axis and the axis of the multifunctional oxygen lance nozzle (3) are 5-30 degrees.
Furthermore, the pressure of the carbon powder injection tank (4) and the lime powder injection tank (5) is 0.6-3.0MPa, and the powder conveying capacity is 0-8000 kg/h.
Further, the multifunctional oxygen lance system is suitable for 30-350 tons of converter steelmaking.
A multifunctional oxygen lance steelmaking method for converter steelmaking is characterized in that according to different requirements of smelting processes, a carbon powder injection tank and a lime powder injection tank are pressurized, the pressure in the tanks is required to be higher than the pressure of a powder conveying pipeline by more than 0.5MPa, carbon powder or lime powder is injected into a molten pool by utilizing the multifunctional oxygen lance, and the purposes of improving the converter scrap steel ratio, reducing the consumption of a slagging agent and steel materials and improving the product quality are achieved.
Furthermore, the granularity of the carbon powder and the lime powder is required to be 50-300 meshes, the fixed carbon content of the carbon powder is more than 85%, and the activity of the lime powder is required to be more than 320 ml/4N-HCl.
The operation steps are as follows:
the method comprises the following steps: filling the heating powder injection tank and the lime powder injection tank with powder, and then pressurizing to more than 1.0MPa for use;
step two: collecting molten iron components, determining tapping conditions, calculating the consumption of carbon powder required by a target scrap ratio after calculating the addition of scrap by using material balance and thermal balance, and setting the injection amount of the carbon powder;
step three: after charging scrap steel and molten iron, descending a multifunctional oxygen lance to start blowing, wherein O is selected as main blowing2/CO2Or the mixed gas of the two gases, the carrier gas for spraying powder selects N2/Ar/CO2Or a mixed gas of several gases, if the dust removal mode is an LT method, when the oxygen concentration in the coal gas is lower than 10%, starting to spray carbon powder with a set value, if the dust removal mode is an OG method, starting to spray carbon powder with a set value after the oxygen lance is successfully ignited, and both the two dust removal modes require that the whole spraying is finished within 3min after smelting is started;
step four: after the carbon powder is sprayed, a slag former is added into a material groove, lime powder is sprayed, and carrier gas is N2/CO2/O2The lime powder spraying amount is within 90 percent of the total lime adding amount, and the lime powder spraying is required to be completed within 10min from the beginning of smelting;
step five: 10min after the beginning of smelting, blowing O into the center hole2/CO2Or the mixed gas of the two gases is mainly used for supplementing the gas of each jet negative pressure area, slowing down the mutual mixing of the jets, delaying the attenuation of the jets, enhancing the stirring of the jets on a molten pool, quickly pulling carbon and reducing the peroxidation degree of the molten steel;
step six: and after the condition of tapping is confirmed to be met, stopping supplying oxygen, and after the multifunctional oxygen lance is lifted to reach the designated position, tapping.
Furthermore, 5-9kg of scrap steel can be added into each 1kg of carbon powder or anthracite powder;
further, the method is suitable for 30-350 ton converter steelmaking.
According to the multifunctional oxygen lance system for converter steelmaking and the steelmaking method, carbon powder, anthracite powder or lime powder is selectively sprayed on the central pipe according to the smelting process conditions of the converter, and N is used as carrier gas2/Ar/CO2Or the mixed gas of several gases, oxygen gun gas pipeline selectively blows O according to different smelting processes2/CO2Or the mixed gas of the two gases, the carbon powder or the anthracite powder injected into the inner layer pipe can increase the heat of a converter molten pool and improve the scrap steel ratio, and the lime powder injected into the inner layer pipe can improve the converter strippingPhosphorus and desulfurization efficiency, reducing end point carbon oxygen deposition. The invention has the beneficial effects that: compared with the traditional oxygen lance smelting method, the multifunctional oxygen lance system has higher flexibility, is suitable for various smelting process requirements, realizes that the scrap steel ratio is increased by more than 10 percent, the lime consumption can be reduced by more than 10 percent, the steel and iron material consumption can be reduced by more than 3kg, and can realize the comprehensive economic benefit of 15 yuan/t steel.
Drawings
FIG. 1 is a process diagram of a multifunctional oxygen lance system.
FIG. 2 is a cross-sectional view of a lance tip.
In the figure, 1-converter, 2-multifunctional oxygen lance, 2-1-powder spraying channel, 2-2-main blowing channel, 2-3-water inlet channel, 2-4-water outlet channel, 3-multifunctional oxygen lance nozzle, 4-temperature raising powder injection tank, 5-lime powder injection tank, 6-powder conveying pipeline, 7-metal hose, 8-powder injection channel, 9-main blowing jet and 10-powder jet.
FIG. 3 is a metallurgical process curve of example 1.
FIG. 4 is a metallurgical process curve of example 2.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
On the contrary, the invention is intended to cover alternatives, modifications, equivalents and alternatives which may be included within the spirit and scope of the invention as defined by the appended claims. Furthermore, in the following detailed description of the present invention, certain specific details are set forth in order to provide a better understanding of the present invention. It will be apparent to one skilled in the art that the present invention may be practiced without these specific details.
Example 1:
the invention is applied to the smelting process of 150-ton converter adopting OG method for dust removal, the oxygen supply time is 16min, and the main blowing flow is 31500Nm3H, the medium is O2And CO2The flow rate of carrier gas for spraying powder is 3150Nm3H, carrier gas medium is N2And CO2The flow rate of the sprayed powder is 1687kg/min, the number of the main spray holes is 5, the Mach number is 2.04, the Mach number of the central hole is 1.8, the carbon content of the carbon powder is 84%, the granularity is 150 meshes, and the granularity of the lime powder is 200 meshes. The powder spraying system and the air injection system are flexibly adjusted according to the smelting working condition.
1) Filling powder into a carbon powder injection tank and a lime powder injection tank, and then pressurizing to 1.5 MPa;
2) collecting molten iron components, determining tapping conditions, and setting the spraying amount of carbon powder to be 3374 kg;
TABLE 1 molten iron composition and temperature conditions
| C/％ | Si/％ | Mn/％ | P/％ | S/％ | Temperature of molten iron/. degree.C |
| 4.07 | 0.43 | 0.76 | 0.114 | 0.053 | 1304 |
TABLE 2 tapping composition and temperature requirements
| C/％ | Mn/％ | P/％ | S/％ | Temperature of molten steel/. degree.C |
| ＞0.07 | ＜0.25 | ＜0.015 | ＜0.05 | ＞1630 |
3) Charging scrap steel and molten iron, and selecting O as main blowing gas2-CO2Mixed gas of (2), CO2The proportion is 6 percent, and N is selected as the powder spraying carrier gas2Lowering the gun for blowing, starting to add blowing carbon powder after confirming that oxygen is ignited, and finishing adding in 2.5 min;
4) and 2.5min after the beginning of smelting, adding a first batch of slagging agent, and simultaneously switching and blowing lime powder in a central hole, wherein the flow rate is 300 kg/min. Smelting for 5min, and adjusting CO in the main blowing hole2The mixing proportion is 4 percent, and a second batch of slagging constituent is added;
5) the smelting is started for 12.5min, and after the lime powder is stopped being blown into the central hole, the carrier gas is switched to CO2Adjusting the main blowing hole CO2The mixing proportion is 5 percent until the smelting is finished;
6) and after the condition of tapping is confirmed to be met, stopping supplying oxygen, and after the multifunctional oxygen lance is lifted to reach the designated position, tapping.
7) Filling the carbon powder injection tank and the lime powder injection tank again;
8) by adopting the multifunctional oxygen lance system and the steelmaking method, the scrap steel ratio is improved by 18 percent, the consumption of steel and iron materials is reduced by 3.5kg/t, and the consumption of lime is reduced by 3.8 kg/t.
Example 2:
the invention is applied to the smelting process of removing dust by adopting an LT method in a 300-ton converter, the oxygen supply time is 15min, and the main blowing gas flow is 60000Nm3H, the medium is O2And CO2The flow rate of carrier gas for spraying powder is 5400Nm3H, carrier gas medium is N2And CO2The spraying flow is 2090kg/min, the number of main spray holes is 6, the Mach number is 2.12, the Mach number of a central hole is 1.92, the fixed carbon content of the anthracite powder is 82%, the particle size is 200 meshes, and the particle size of the lime powder is 200 meshes. The powder spraying system and the air injection system are flexibly adjusted according to the smelting working condition.
1) Filling powder into the anthracite powder injection tank and the lime powder injection tank, and then pressurizing to 1.5 MPa;
2) collecting molten iron components, determining tapping conditions, and setting the spraying amount of carbon powder to 4180 kg;
TABLE 3 molten iron composition and temperature conditions
| C/％ | Si/％ | Mn/％ | P/％ | S/％ | Temperature of molten iron/. degree.C |
| 4.21 | 0.52 | 0.57 | 0.102 | 0.043 | 1314 |
TABLE 4 Steel composition and temperature requirements
| C/％ | Mn/％ | P/％ | S/％ | Temperature of molten steel/. degree.C |
| ＜0.06 | ＜0.25 | ＜0.013 | ＜0.05 | ＞1650 |
3) Charging scrap steel and molten iron, and selecting O as main blowing gas2-CO2Mixed gas of (2), CO2The proportion is 8 percent, and N is selected as the powder spraying carrier gas2Starting descending a gun for converting, after confirming that oxygen is ignited, waiting for the basic stability of the flow of main blowing gas, and the oxygen concentration in coal gas is lower than 10%, starting adding and blowing anthracite powder, wherein the spraying time is less than 2 min;
4) 3min after the beginning of smelting, the addition is startedThe first batch of slag former is about 2/3 of the total slag former addition, and the central hole is switched to spray lime powder, wherein the flow rate is 750 kg/min. Smelting for 4min, and adjusting CO in the main blowing hole2The mixing proportion is 5 percent, and the rest slag former is added;
5) the smelting is started for 11min, and after the lime powder blowing in the center hole is stopped, the carrier gas is switched to CO2Adjusting the main blowing hole CO2The mixing proportion is 8 percent until smelting is finished;
6) after the condition of tapping is confirmed to be met, oxygen supply is stopped, and after the multifunctional oxygen lance is lifted to reach the designated position, the tapping is waited.
7) The anthracite powder injection tank and the lime powder injection tank are filled again;
8) by adopting the multifunctional oxygen lance system and the steelmaking method, the scrap steel ratio is improved by 8 percent, the consumption of steel and iron materials is reduced by 2.3kg/t, and the consumption of lime is reduced by 4.6 kg/t.
Claims (8)
1. A multifunctional oxygen lance system for converter steelmaking is characterized by comprising a converter (1), a multifunctional oxygen lance (2), a multifunctional oxygen lance nozzle (3), a heating powder injection tank (4), a lime powder injection tank (5), a powder conveying pipeline (6), a metal hose (7) and a powder injection channel (8); the oxygen lance comprises a powder spraying channel (2-1), a main blowing channel (2-2), a water inlet channel (2-3) and a water outlet channel (2-4); the temperature-rising powder injection tank (4) and the lime powder injection tank (5) are connected with the powder conveying pipeline (6), the powder conveying pipeline (6) is connected with the metal hose (7), the metal hose (7) is connected with the powder injection channel (8), the powder injection channel (8) is connected with the multifunctional oxygen lance nozzle (3), the powder conveying pipeline (6) is arranged in the center of the main blowing channel (2-2), and one part of the multifunctional oxygen lance (2) and the multifunctional oxygen lance nozzle (3) are arranged in the converter (1) when in use;
the multifunctional oxygen lance nozzle (3) is made of copper or steel, the spray holes are arranged in the form of a central single hole and peripheral multiple holes, wherein the Mach number of the central single hole is 1.0-2.1, the angle of alpha 1 is 0-60 degrees, and the flow range is 100-40000Nm3H, the number of peripheral porous holes is 3-12, the Mach number is 1.5-2.4, and the spray is carried outThe angle of a half cone angle alpha 2 of the hole expansion section is 2-10 degrees, and the included angles alpha 3 and alpha 4 between the axis of the spray hole and the axis of the multifunctional oxygen lance nozzle (3) are 5-30 degrees;
the multifunctional oxygen lance (2) is of a four-layer pipe structure, the diameter of a central pipe is 18-325mm, the diameter of an outer pipe is 89-630mm, the powder spraying channel (2-1) conveys carbon powder, anthracite powder or lime powder, the carrier gas flow accounts for 1% -90% of the total gas supply flow, the powder flow is 0-8000kg/h, the powder-gas ratio is 0-150, and the main blowing channel (2-2) conveys N2/CO2/O2Or a mixture of several gases with the flow rate of 5000-3The water inlet channel (2-3) is a cooling water inlet channel with the flow rate of 60-800m3The water outlet channel (2-4) is a cooling water return channel with the flow rate of 60-800m3/h。
2. The multifunctional oxygen lance system for converter steelmaking as claimed in claim 1, wherein the pressure of the temperature-raising powder injection tank (4) and the lime powder injection tank (5) is 0.6-3.0MPa, and the powder conveying capacity is 0-8000 kg/h.
3. The multifunctional oxygen lance system for converter steelmaking as claimed in claim 1, wherein the multifunctional oxygen lance system is suitable for converter steelmaking of 30-350 tons.
4. A steelmaking method of the multifunctional oxygen lance system for converter steelmaking according to any one of claims 1 to 3, characterized in that the steelmaking method is based on different requirements of smelting process, the pressure in the heating powder injection tank (4) and the lime powder injection tank (5) is required to be increased, the pressure in the tanks is required to be higher than the pressure in the powder conveying pipeline (6) by more than 0.5MPa, carbon powder, coal powder or lime powder is injected into a molten pool by using the multifunctional oxygen lance (2), and the purposes of improving converter scrap ratio, reducing slagging agent consumption, steel and iron material consumption and improving product quality are achieved.
5. The steelmaking method using the multifunctional oxygen lance system for converter steelmaking as claimed in claim 4, wherein the particle size of the carbon powder, the anthracite powder and the lime powder is required to be 50-300 meshes, the carbon content of the carbon powder and the anthracite powder is more than 70%, and the activity of the lime powder is required to be more than 320 ml/4N-HCl.
6. The steelmaking method using the multifunctional oxygen lance system for converter steelmaking as claimed in claim 4, wherein the method comprises the following steps:
the method comprises the following steps: filling the heating powder injection tank and the lime powder injection tank with powder, and then pressurizing to more than 1.0MPa for use;
step two: collecting molten iron components, determining tapping conditions, calculating the consumption of carbon powder or anthracite powder required by a target scrap ratio after calculating the addition of the scrap by using material balance and thermal balance, and setting the injection amount;
step three: after charging scrap steel and molten iron, descending a multifunctional oxygen lance to start blowing, wherein O is selected as main blowing2/CO2Or the mixed gas of the two gases, the carrier gas for spraying powder selects N2/Ar/CO2Or a mixed gas of a plurality of gases, if the dust removal mode is an LT method, when the oxygen concentration in the coal gas is lower than 10%, carbon powder or anthracite powder with a set value is injected, if the dust removal mode is an OG method, after the successful ignition of the oxygen lance is confirmed, the carbon powder or the anthracite powder with the set value is injected, and both the two dust removal modes require that the whole injection is completed within 3min after the smelting is started;
step four: after the carbon powder or anthracite powder is sprayed, a slag former is added into a material groove, lime powder is sprayed, and carrier gas selects N2/CO2/O2The lime powder spraying amount is within 90 percent of the total lime adding amount, and the lime powder spraying is required to be completed within 10min from the beginning of smelting;
step five: 10min after the beginning of smelting, blowing O into the center hole2/CO2Or the mixed gas of the two gases is mainly used for supplementing the gas of each jet negative pressure area, slowing down the mutual mixing of the jets, delaying the attenuation of the jets, enhancing the stirring of the jets on a molten pool, quickly pulling carbon and reducing the peroxidation degree of the molten steel;
step six: and after the condition of tapping is confirmed to be met, stopping supplying oxygen, and after the multifunctional oxygen lance is lifted to reach the designated position, tapping.
7. The steelmaking method using the multifunctional oxygen lance system for converter steelmaking as claimed in claim 4, wherein for every 1kg of carbon powder or anthracite powder, 4-10kg of scrap steel is added.
8. The steelmaking method using the multifunctional oxygen lance system for converter steelmaking as claimed in claim 4, wherein the method is suitable for converter steelmaking of 30-350 tons.
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| CN102643946A (en) * | 2012-04-24 | 2012-08-22 | 北京科技大学 | Converter steelmaking method through power injection dephosphorization by adopting supersonic speed oxygen lance and supersonic speed oxygen lance |
| CN104357615A (en) * | 2014-11-25 | 2015-02-18 | 北京首钢国际工程技术有限公司 | Dephosphorization method for molten iron in converter by blowing dust removal ash |
| CN106086289A (en) * | 2016-08-01 | 2016-11-09 | 朱荣 | A kind of top blow oxygen lance is used to dust the method for making steel of smelting stainless steel mother liquid and device |
| CN107034336A (en) * | 2017-05-23 | 2017-08-11 | 钢铁研究总院 | It is a kind of to improve the device and method that slag effect is splashed in converter |
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