CN108148946A - A kind of LF stoves refinery practice - Google Patents
A kind of LF stoves refinery practice Download PDFInfo
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- CN108148946A CN108148946A CN201810013101.0A CN201810013101A CN108148946A CN 108148946 A CN108148946 A CN 108148946A CN 201810013101 A CN201810013101 A CN 201810013101A CN 108148946 A CN108148946 A CN 108148946A
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- stoves
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- argon
- calcium carbide
- slag
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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
- C21C7/0075—Treating in a ladle furnace, e.g. up-/reheating of molten steel within the ladle
-
- 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
- C21C7/06—Deoxidising, e.g. killing
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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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- Engineering & Computer Science (AREA)
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- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention discloses a kind of LF stoves refinery practices, are related to iron and steel smelting technology field, solve the problems, such as to be difficult to efficiently control carburetting while deep desulfurization.The present invention by heating, add in lime and dynamic control argon flow amount stage by stage during calcium carbide, to ensure to have enough Argons to stir work(come while ensureing desulfurization effect, it is excessive and steel, slag is caused acutely to seethe to avoid the argon flow amount in heating process, so that steel, slag and graphite electrode haptoreaction and lead to direct or indirect carburetting, not only completed deep desulfurization but also effectively control carburetting；For the present invention with only molten steel depth desulfurization task is just completed with several conventional materials such as lime, calcium carbide and iron calcium lines, cost has been saved in medicament less investment.
Description
Technical field
The present invention relates to iron and steel smelting technology field, more specifically, it relates to a kind of LF stoves refinery practice.
Background technology
With the increasingly raising that user requires steel product quality, ladle refining furnace (LadleFurnace abbreviation LF stoves) conduct
Improve Cleanliness of Molten Steel, promoted steel product quality means rapidly developed, become at present modernization steel produce short route
In an indispensable procedure.LF refining furnace is in addition to using the heating of reducing atmosphere submerged arc, vacuum outgas, the stirring of air brick Argon
Outside etc. more mature Secondary Refining Technology, refining with synthetic flux technology is also introduced, to reach by rational slagging process
Desulfurization, the deoxidation even purpose of denitrogenation so as to effectively absorb the field trash in steel, control the form of field trash, additionally can profit
Electric arc is flooded with formed foamed slag is made steel, improves the thermal efficiency, refractory material is reduced and corrodes.
At present, deep desulfurization technology mainly has Deep Desulphurization of Hot Metal, the control of first furnace to increase sulphur, the desulfurization of molten steel depth, anti-non-return sulphur etc.,
The mode of molten steel depth desulfurization is mainly using LF and RH (vacuum circulation degassing refining) combination technique.LF stoves realize that super-low sulfur must be according to
By good dynamic conditions, i.e., stronger Bottom Argon Stirring, but to directly contribute molten steel liquid level bright using strong mixing for BOTTOM ARGON BLOWING
Aobvious fluctuation, liquid fluctuating can lead to electrode and steel contacts and generate contact carburetting；In addition, stronger Bottom Argon Stirring makes stove
Slag is contacted with electrode can also cause molten steel to generate indirect carburetting.The carburetting that electrode band comes is there are mainly two types of form, first, acutely stirring
It mixes so that molten steel or clinker wash away electrode surface, electrode surface part carbon dust is caused to come off and alloying；Second, being vigorously stirred makes
Electrode is contacted with clinker, during heating, the oxide into the electrode and slag in slag, such as：FeO、MnO、V2O5Wait carry out as follows
Reaction：C+FeO → CO+Fe, C+MnO → CO+Mn, 5C+V2O5→5CO+2V.As a result, oxide unstable in slag subtracts
It is few, the reproducibility and desulfurization effect of clinker are improved, meanwhile, also further such that producing carburetting in molten steel.Therefore, in reality
Produce low-carbon ultralow-sulfur steel when often will appear because LF furnace bottoms Argon control it is improper wait operation sexual factor caused by carbon content it is excessively high, lead
RH stoves is caused to be forced to carry out ingredient redemption using oxygen decarburization pattern, so as to cause unfavorable shadow to steel quality and production efficiency
It rings.
At present, there are some researchs to LF stove depth desulfurizing and refining techniques both at home and abroad, such as：Publication No. CN102002554A, it is public
The Chinese patent application that day is on April 6th, 2011 is opened, the desulfurization by the way of powder-spraying metallurgical has reached preferable desulfurization effect
Fruit, but its processing final sulfur content is unstable, and powder-spraying metallurgical increases equipment investment；Publication No. JP6145764A, it is public
The Japanese patent application that day is on May 27th, 1994 is opened, primarily focuses on the research of refining slag system and the repetition profit of refining slag
With.Therefore, it is current problem to be solved that carburetting is efficiently controlled while how LF stoves realize ultra-deep desulfuration.
Invention content
In view of the deficiencies of the prior art, the present invention intends to provide a kind of LF stoves refinery practice, pass through optimization
LF stove whole process Argon supplies, dynamic control argon flow amount and in batches residue adjustment stage by stage, and solution is difficult to effective while deep desulfurization
Ground controls the problem of carburetting, has the advantages that not only to complete deep desulfurization but also effectively controls carburetting.
To achieve the above object one, the present invention provides following technical solutions：
A kind of LF stoves refinery practice, includes the following steps：
Step 1 will bessemerize qualified molten steel and add in LF stoves, liquid steel temperature control at 1520-1540 DEG C, molten steel into
It is divided into C0.37-0.42%, Si0.10-0.17%, Mn0.5-0.6%, P≤0.025%, T [O]≤30ppm, LF stoves during tapping
Bottom blowing argon gas；
Step 2, power transmission heating, electric current 25000-35000A, heating slag making time are 10-13min, and thermometric samples；
Electric current is adjusted to 30000-35000A by step 3, divides 2-3 batches to add in lime, lime addition is 500-530kg, is adjusted
Whole argon flow amount is 50-100L/min, argon pressure 0.3-0.4MPa；
Step 4, the top of the slag use calcium carbide deoxidation, and calcium carbide is added portionwise and carries out residue adjustment, it is 1-1.5kg/ tons of steel that calcium carbide, which adds in total amount,；
Step 5, sampling analysis, according to target ingredient be adjusted, argon flow amount is improved after adjusting component；
Step 6, carries out soft blow after temperature, ingredient qualification, and the soft blow time is 15-18min, soft blow process observation liquid steel level feelings
Condition avoids molten steel exposed；
Step 7, liquid steel temperature >=1570 DEG C, clinker adds in ferrotianium after bleaching, after outbound preceding ingredient, temperature reach technological requirement,
Iron calcium line 250m, wire-feeding velocity 3-5m/s are fed, closes argon gas, completes the steel-making of LF stoves.
Further preferably, argon flow amount is 100-150L/min, argon pressure 0.3-0.4MPa in the step 1.
Further preferably, argon flow amount is 250-350L/min in slagging process in the step 2, and argon pressure is
0.3-0.4MPa。
Further preferably, the step 3 specifically includes：Electric current is adjusted to 30000-35000A, divides 2-3 batches to add in
Lime, lime addition be 500-530kg, adjustment argon flow amount be 50-100L/min, argon pressure 0.3-0.4MPa, then
Mobility depending on clinker adds fluorite, and the adjustment clinker quantity of slag is 10-12kg/ tons of steel, and basicity control is kept in 2.0-3.0, white slag
15 minutes or more, FeO+MnO ＜ 1.0%.
Further preferably, the step 4 specifically includes：The top of the slag uses calcium carbide deoxidation, and point 5 batches of addition calcium carbides are adjusted
Slag adds in the 1/5 of calcium carbide total amount every time, and every batch of calcium carbide adds in time interval 30s, and it is 1-1.5kg/ tons of steel that calcium carbide, which adds in total amount,.
Further preferably, argon flow amount is 400-500L/min in the step 5.
Further preferably, the flow of argon gas is 50-60L/min during soft blow in the step 6.
Further preferably, ferrotianium titaniferous amount is 28-30%, rate of recovery 60-70% in the step 7.
The present invention by heating, add in lime and dynamic control argon flow amount stage by stage during calcium carbide, to ensure to have enough
Argon stirring work(it is excessive and cause steel, slag acute while ensureing desulfurization effect, to avoid the argon flow amount in heating process
It is strong to seethe so that steel, slag and graphite electrode haptoreaction and lead to direct or indirect carburetting.Thus in entire refining process,
Not only it had completed deep desulfurization but also had effectively controlled carburetting.The method of the present invention desulfurization degree up to more than 93%, carburetting control 45ppm with
Under, can steady production sulfur content below 6ppm steel product.The present invention is with only with several routines such as lime, calcium carbide and iron calcium lines
Material just completes molten steel depth desulfurization task, and cost has been saved in medicament less investment.The present invention passes through dynamic control argon gas stage by stage
Flow reduces the consumption of the argon gas of steel per ton, has saved cost.
In conclusion compared with prior art, the invention has the advantages that：
(1) by heating, add in lime and dynamic control argon flow amount stage by stage during calcium carbide, to ensure to there are enough Argons to stir
It is excessive and steel, slag is caused acutely to seethe while ensureing desulfurization effect, to avoid the argon flow amount in heating process to mix work(, makes
It obtains steel, slag and graphite electrode haptoreaction and leads to direct or indirect carburetting, not only completed deep desulfurization but also effectively control carburetting；
(2) present invention with several conventional materials such as lime, calcium carbide and iron calcium lines with only just completing molten steel depth desulfurization task, medicament
Cost has been saved in less investment；
(3) present invention reduces the consumption of the argon gas of steel per ton by dynamic control argon flow amount stage by stage, saved into
This.
Description of the drawings
Fig. 1 is the process flow chart of the present invention.
Specific embodiment
With reference to the accompanying drawings and examples, the present invention will be described in detail.
Embodiment 1：As shown in Figure 1, a kind of LF stoves refinery practice, includes the following steps：LF stoves enter the station molten steel initial carbon and
The content of sulphur is C：0.04%, S：0.009%；
Step 1, will bessemerize qualified molten steel and adds in LF stoves, and liquid steel temperature control is in 1520 DEG C, the ingredient of molten steel
C0.37-0.42%, Si0.10-0.17%, Mn0.5-0.6%, P≤0.025%, T [O]≤30ppm, LF furnace bottoms during tapping
Blowing argon gas, argon flow amount 100L/min, argon pressure 0.3MPa；
Step 2, power transmission heating, electric current 25000A, the heating slag making time is 10min, and argon flow amount is in slagging process
250L/min, argon pressure 0.3MPa, thermometric, sampling；
Electric current is adjusted to 30000A by step 3, divides 2-3 batches to add in lime, lime addition is 500kg, adjusts argon flow amount
Fluorite is added for 50L/min, argon pressure 0.3MPa, then depending on the mobility of clinker, the adjustment clinker quantity of slag is 10kg/ tons of steel,
Basicity control is 2.0, and white slag is kept for 15 minutes or more, FeO+MnO ＜ 1.0%；
Step 4, the top of the slag use calcium carbide deoxidation, and point 5 batches of addition calcium carbides carry out residue adjustment, add in the 1/5 of calcium carbide total amount every time, every batch of
Calcium carbide adds in time interval 30s, and it is 1kg/ tons of steel that calcium carbide, which adds in total amount,；
Step 5, sampling analysis, according to target ingredient be adjusted, argon flow amount, argon flow amount 400L/ are improved after adjusting component
min；
Step 6, carries out soft blow after temperature, ingredient qualification, and the soft blow time is 15min, and the flow of argon gas is 50L/min during soft blow,
Soft blow process observation liquid steel level situation, avoids molten steel exposed；
Step 7, liquid steel temperature >=1570 DEG C, clinker add in ferrotianium after bleaching, ferrotianium titaniferous amount is 28%, the rate of recovery 60%,
After outbound preceding ingredient, temperature reach technological requirement, iron calcium line 250m, wire-feeding velocity 3-5m/s are fed, closes argon gas, completes the refining of LF stoves
Steel.
Embodiment 2：A kind of LF stoves refinery practice, includes the following steps：The enter the station content of molten steel initial carbon and sulphur of LF stoves is
C：0.041%, S：0.0095%；
Step 1, will bessemerize qualified molten steel and adds in LF stoves, and liquid steel temperature control is in 1530 DEG C, the ingredient of molten steel
C0.37-0.42%, Si0.10-0.17%, Mn0.5-0.6%, P≤0.025%, T [O]≤30ppm, LF furnace bottoms during tapping
Blowing argon gas, argon flow amount 125L/min, argon pressure 0.35MPa；
Step 2, power transmission heating, electric current 25000A, the heating slag making time is 10min, and argon flow amount is in slagging process
250L/min, argon pressure 0.3MPa, thermometric, sampling；
Electric current is adjusted to 30000A by step 3, divides 2-3 batches to add in lime, lime addition is 500kg, adjusts argon flow amount
Fluorite is added for 50L/min, argon pressure 0.3MPa, then depending on the mobility of clinker, the adjustment clinker quantity of slag is 10kg/ tons of steel,
Basicity control is 2.0, and white slag is kept for 15 minutes or more, FeO+MnO ＜ 1.0%；
Step 4, the top of the slag use calcium carbide deoxidation, and point 5 batches of addition calcium carbides carry out residue adjustment, add in the 1/5 of calcium carbide total amount every time, every batch of
Calcium carbide adds in time interval 30s, and it is 1kg/ tons of steel that calcium carbide, which adds in total amount,；
Step 5, sampling analysis, according to target ingredient be adjusted, argon flow amount, argon flow amount 400L/ are improved after adjusting component
min；
Step 6, carries out soft blow after temperature, ingredient qualification, and the soft blow time is 15min, and the flow of argon gas is 50L/min during soft blow,
Soft blow process observation liquid steel level situation, avoids molten steel exposed；
Step 7, liquid steel temperature >=1570 DEG C, clinker add in ferrotianium after bleaching, ferrotianium titaniferous amount is 28%, the rate of recovery 60%,
After outbound preceding ingredient, temperature reach technological requirement, iron calcium line 250m, wire-feeding velocity 3-5m/s are fed, closes argon gas, completes the refining of LF stoves
Steel.
Embodiment 3：A kind of LF stoves refinery practice, includes the following steps：The enter the station content of molten steel initial carbon and sulphur of LF stoves is
C：0.04%, S：0.0088%；
Step 1, will bessemerize qualified molten steel and adds in LF stoves, and liquid steel temperature control is in 1540 DEG C, the ingredient of molten steel
C0.37-0.42%, Si0.10-0.17%, Mn0.5-0.6%, P≤0.025%, T [O]≤30ppm, LF furnace bottoms during tapping
Blowing argon gas, argon flow amount 150L/min, argon pressure 0.4MPa；
Step 2, power transmission heating, electric current 25000A, the heating slag making time is 10min, and argon flow amount is in slagging process
250L/min, argon pressure 0.3MPa, thermometric, sampling；
Electric current is adjusted to 30000A by step 3, divides 2-3 batches to add in lime, lime addition is 500kg, adjusts argon flow amount
Fluorite is added for 50L/min, argon pressure 0.3MPa, then depending on the mobility of clinker, the adjustment clinker quantity of slag is 10kg/ tons of steel,
Basicity control is 2.0, and white slag is kept for 15 minutes or more, FeO+MnO ＜ 1.0%；
Step 4, the top of the slag use calcium carbide deoxidation, and point 5 batches of addition calcium carbides carry out residue adjustment, add in the 1/5 of calcium carbide total amount every time, every batch of
Calcium carbide adds in time interval 30s, and it is 1kg/ tons of steel that calcium carbide, which adds in total amount,；
Step 5, sampling analysis, according to target ingredient be adjusted, argon flow amount, argon flow amount 400L/ are improved after adjusting component
min；
Step 6, carries out soft blow after temperature, ingredient qualification, and the soft blow time is 15min, and the flow of argon gas is 50L/min during soft blow,
Soft blow process observation liquid steel level situation, avoids molten steel exposed；
Step 7, liquid steel temperature >=1570 DEG C, clinker add in ferrotianium after bleaching, ferrotianium titaniferous amount is 28%, the rate of recovery 60%,
After outbound preceding ingredient, temperature reach technological requirement, iron calcium line 250m, wire-feeding velocity 3-5m/s are fed, closes argon gas, completes the refining of LF stoves
Steel.
Embodiment 4：A kind of LF stoves refinery practice, includes the following steps：The enter the station content of molten steel initial carbon and sulphur of LF stoves is
C：0.039%, S：0.0089%；
Step 1, will bessemerize qualified molten steel and adds in LF stoves, and liquid steel temperature control is in 1520 DEG C, the ingredient of molten steel
C0.37-0.42%, Si0.10-0.17%, Mn0.5-0.6%, P≤0.025%, T [O]≤30ppm, LF furnace bottoms during tapping
Blowing argon gas, argon flow amount 100L/min, argon pressure 0.3MPa；
Step 2, power transmission heating, electric current 30000A, the heating slag making time is 12min, and argon flow amount is in slagging process
300L/min, argon pressure 0.35MPa, thermometric, sampling；
Electric current is adjusted to 30000A by step 3, divides 2-3 batches to add in lime, lime addition is 500kg, adjusts argon flow amount
Fluorite is added for 50L/min, argon pressure 0.3MPa, then depending on the mobility of clinker, the adjustment clinker quantity of slag is 10kg/ tons of steel,
Basicity control is 2.0, and white slag is kept for 15 minutes or more, FeO+MnO ＜ 1.0%；
Step 4, the top of the slag use calcium carbide deoxidation, and point 5 batches of addition calcium carbides carry out residue adjustment, add in the 1/5 of calcium carbide total amount every time, every batch of
Calcium carbide adds in time interval 30s, and it is 1kg/ tons of steel that calcium carbide, which adds in total amount,；
Step 5, sampling analysis, according to target ingredient be adjusted, argon flow amount, argon flow amount 400L/ are improved after adjusting component
min；
Step 6, carries out soft blow after temperature, ingredient qualification, and the soft blow time is 15min, and the flow of argon gas is 50L/min during soft blow,
Soft blow process observation liquid steel level situation, avoids molten steel exposed；
Step 7, liquid steel temperature >=1570 DEG C, clinker add in ferrotianium after bleaching, ferrotianium titaniferous amount is 28%, the rate of recovery 60%,
After outbound preceding ingredient, temperature reach technological requirement, iron calcium line 250m, wire-feeding velocity 3-5m/s are fed, closes argon gas, completes the refining of LF stoves
Steel.
Embodiment 5：A kind of LF stoves refinery practice, includes the following steps：The enter the station content of molten steel initial carbon and sulphur of LF stoves is
C：0.042%, S：0.0094%；
Step 1, will bessemerize qualified molten steel and adds in LF stoves, and liquid steel temperature control is in 1520 DEG C, the ingredient of molten steel
C0.37-0.42%, Si0.10-0.17%, Mn0.5-0.6%, P≤0.025%, T [O]≤30ppm, LF furnace bottoms during tapping
Blowing argon gas, argon flow amount 100L/min, argon pressure 0.3MPa；
Step 2, power transmission heating, electric current 35000A, the heating slag making time is 13min, and argon flow amount is in slagging process
350L/min, argon pressure 0.4MPa, thermometric, sampling；
Electric current is adjusted to 30000A by step 3, divides 2-3 batches to add in lime, lime addition is 500kg, adjusts argon flow amount
Fluorite is added for 50L/min, argon pressure 0.3MPa, then depending on the mobility of clinker, the adjustment clinker quantity of slag is 10kg/ tons of steel,
Basicity control is 2.0, and white slag is kept for 15 minutes or more, FeO+MnO ＜ 1.0%；
Step 4, the top of the slag use calcium carbide deoxidation, and point 5 batches of addition calcium carbides carry out residue adjustment, add in the 1/5 of calcium carbide total amount every time, every batch of
Calcium carbide adds in time interval 30s, and it is 1kg/ tons of steel that calcium carbide, which adds in total amount,；
Step 5, sampling analysis, according to target ingredient be adjusted, argon flow amount, argon flow amount 400L/ are improved after adjusting component
min；
Step 6, carries out soft blow after temperature, ingredient qualification, and the soft blow time is 15min, and the flow of argon gas is 50L/min during soft blow,
Soft blow process observation liquid steel level situation, avoids molten steel exposed；
Step 7, liquid steel temperature >=1570 DEG C, clinker add in ferrotianium after bleaching, ferrotianium titaniferous amount is 28%, the rate of recovery 60%,
After outbound preceding ingredient, temperature reach technological requirement, iron calcium line 250m, wire-feeding velocity 3-5m/s are fed, closes argon gas, completes the refining of LF stoves
Steel.
Embodiment 6：A kind of LF stoves refinery practice, includes the following steps：The enter the station content of molten steel initial carbon and sulphur of LF stoves is
C：0.04%, S：0.0091%；
Step 1, will bessemerize qualified molten steel and adds in LF stoves, and liquid steel temperature control is in 1520 DEG C, the ingredient of molten steel
C0.37-0.42%, Si0.10-0.17%, Mn0.5-0.6%, P≤0.025%, T [O]≤30ppm, LF furnace bottoms during tapping
Blowing argon gas, argon flow amount 100L/min, argon pressure 0.3MPa；
Step 2, power transmission heating, electric current 25000A, the heating slag making time is 10min, and argon flow amount is in slagging process
250L/min, argon pressure 0.3MPa, thermometric, sampling；
Electric current is adjusted to 33000A by step 3, divides 2-3 batches to add in lime, lime addition is 515kg, adjusts argon flow amount
Fluorite is added for 75L/min, argon pressure 0.35MPa, then depending on the mobility of clinker, the adjustment clinker quantity of slag is 11kg/ tons of steel,
Basicity control is 2.5, and white slag is kept for 15 minutes or more, FeO+MnO ＜ 1.0%；
Step 4, the top of the slag use calcium carbide deoxidation, and point 5 batches of addition calcium carbides carry out residue adjustment, add in the 1/5 of calcium carbide total amount every time, every batch of
Calcium carbide adds in time interval 30s, and it is 1kg/ tons of steel that calcium carbide, which adds in total amount,；
Step 5, sampling analysis, according to target ingredient be adjusted, argon flow amount, argon flow amount 400L/ are improved after adjusting component
min；
Step 6, carries out soft blow after temperature, ingredient qualification, and the soft blow time is 15min, and the flow of argon gas is 50L/min during soft blow,
Soft blow process observation liquid steel level situation, avoids molten steel exposed；
Step 7, liquid steel temperature >=1570 DEG C, clinker add in ferrotianium after bleaching, ferrotianium titaniferous amount is 28%, the rate of recovery 60%,
After outbound preceding ingredient, temperature reach technological requirement, iron calcium line 250m, wire-feeding velocity 3-5m/s are fed, closes argon gas, completes the refining of LF stoves
Steel.
Embodiment 7：A kind of LF stoves refinery practice, includes the following steps：The enter the station content of molten steel initial carbon and sulphur of LF stoves is
C：0.038%, S：0.0092%；
Step 1, will bessemerize qualified molten steel and adds in LF stoves, and liquid steel temperature control is in 1520 DEG C, the ingredient of molten steel
C0.37-0.42%, Si0.10-0.17%, Mn0.5-0.6%, P≤0.025%, T [O]≤30ppm, LF furnace bottoms during tapping
Blowing argon gas, argon flow amount 100L/min, argon pressure 0.3MPa；
Step 2, power transmission heating, electric current 25000A, the heating slag making time is 10min, and argon flow amount is in slagging process
250L/min, argon pressure 0.3MPa, thermometric, sampling；
Electric current is adjusted to 35000A by step 3, divides 2-3 batches to add in lime, lime addition is 530kg, adjusts argon flow amount
Fluorite is added for 100L/min, argon pressure 0.4MPa, then depending on the mobility of clinker, the adjustment clinker quantity of slag is 12kg/ tons of steel,
Basicity control is 3.0, and white slag is kept for 15 minutes or more, FeO+MnO ＜ 1.0%；
Step 4, the top of the slag use calcium carbide deoxidation, and point 5 batches of addition calcium carbides carry out residue adjustment, add in the 1/5 of calcium carbide total amount every time, every batch of
Calcium carbide adds in time interval 30s, and it is 1kg/ tons of steel that calcium carbide, which adds in total amount,；
Step 5, sampling analysis, according to target ingredient be adjusted, argon flow amount, argon flow amount 400L/ are improved after adjusting component
min；
Step 6, carries out soft blow after temperature, ingredient qualification, and the soft blow time is 15min, and the flow of argon gas is 50L/min during soft blow,
Soft blow process observation liquid steel level situation, avoids molten steel exposed；
Step 7, liquid steel temperature >=1570 DEG C, clinker add in ferrotianium after bleaching, ferrotianium titaniferous amount is 28%, the rate of recovery 60%,
After outbound preceding ingredient, temperature reach technological requirement, iron calcium line 250m, wire-feeding velocity 3-5m/s are fed, closes argon gas, completes the refining of LF stoves
Steel.
Embodiment 8：A kind of LF stoves refinery practice, the difference lies in calcium carbide adds in total amount in step 4 with embodiment 1
For 1.25kg/ tons of steel.
Embodiment 9：A kind of LF stoves refinery practice, the difference lies in calcium carbide adds in total amount in step 4 with embodiment 1
For 1.5kg/ tons of steel.
Embodiment 10：A kind of LF stoves refinery practice, the difference lies in argon flow amount is in step 5 with embodiment 1
450L/min。
Embodiment 11：A kind of LF stoves refinery practice, the difference lies in argon flow amount is in step 5 with embodiment 1
500L/min。
Embodiment 12：A kind of LF stoves refinery practice, the difference lies in step 6 is with embodiment 1：Temperature, ingredient
Carry out soft blow after qualification, the soft blow time is 16min, and the flow of argon gas is 55L/min during soft blow, soft blow process observation liquid steel level
Situation avoids molten steel exposed.
Embodiment 13：A kind of LF stoves refinery practice, the difference lies in step 6 is with embodiment 1：Temperature, ingredient
Carry out soft blow after qualification, the soft blow time is 18min, and the flow of argon gas is 60L/min during soft blow, soft blow process observation liquid steel level
Situation avoids molten steel exposed.
Embodiment 14：A kind of LF stoves refinery practice, the difference lies in ferrotianium titaniferous amounts in step 7 with embodiment 1
It is 29%, the rate of recovery 65%.
Embodiment 15：A kind of LF stoves refinery practice, the difference lies in ferrotianium titaniferous amounts in step 7 with embodiment 1
It is 30%, the rate of recovery 70%.
Comparative example 1：A kind of LF stoves refinery practice, the difference lies at conventional LF stove refinings with embodiment 1
For BOTTOM ARGON BLOWING by the way of strong mixing, constant argon flow amount is 600L/min in reason pattern, i.e. refining process.
The sulfur content and carbon content of molten steel after embodiment 1-15 is handled with comparative example 1 are detected, calculates carbon increasing amount and desulfurization degree,
The results are shown in Table 1.From 1 data of table：Refinery practice using the present invention, desulfuration efficiency go out up to more than 93%, LF stoves
Sulfur content of standing can be controlled within 6ppm, and carbon increasing amount is not more than 50ppm.And conventional LF stove refining treatment patterns are used,
The outbound sulfur content of LF stoves is 20ppm, and carbon increasing amount reaches 170ppm, and therefore, the present invention can be effective while molten steel depth desulfurization is realized
Control carbon increasing amount.
The carbon increasing amount and desulfurization degree of molten steel after 1 embodiment 1-15 of table is handled with comparative example 1
The above is only the preferred embodiment of the present invention, and protection scope of the present invention is not limited merely to above-described embodiment,
All technical solutions belonged under thinking of the present invention all belong to the scope of protection of the present invention.It should be pointed out that for the art
For those of ordinary skill, several improvements and modifications without departing from the principles of the present invention, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (8)
1. a kind of LF stoves refinery practice, which is characterized in that include the following steps：
Step 1 will bessemerize qualified molten steel and add in LF stoves, liquid steel temperature control at 1520-1540 DEG C, molten steel into
It is divided into C 0.37-0.42%, Si 0.10-0.17%, Mn 0.5-0.6%, P≤0.025%, T [O]≤30ppm, LF furnace bottoms during tapping
Portion's blowing argon gas；
Step 2, power transmission heating, electric current 25000-35000A, heating slag making time are 10-13min, and thermometric samples；
Electric current is adjusted to 30000-35000A by step 3, divides 2-3 batches to add in lime, lime addition is 500-530kg, is adjusted
Whole argon flow amount is 50-100L/min, argon pressure 0.3-0.4MPa；
Step 4, the top of the slag use calcium carbide deoxidation, and calcium carbide is added portionwise and carries out residue adjustment, it is 1-1.5kg/ tons of steel that calcium carbide, which adds in total amount,；
Step 5, sampling analysis, according to target ingredient be adjusted, argon flow amount is improved after adjusting component；
Step 6, carries out soft blow after temperature, ingredient qualification, and the soft blow time is 15-18min, soft blow process observation liquid steel level feelings
Condition avoids molten steel exposed；
Step 7, liquid steel temperature >=1570 DEG C, clinker adds in ferrotianium after bleaching, after outbound preceding ingredient, temperature reach technological requirement,
Iron calcium line 250m, wire-feeding velocity 3-5m/s are fed, closes argon gas, completes the steel-making of LF stoves.
2. LF stoves refinery practice according to claim 1, which is characterized in that argon flow amount is 100- in the step 1
150L/min, argon pressure 0.3-0.4MPa.
3. LF stoves refinery practice according to claim 1, which is characterized in that argon gas stream in slagging process in the step 2
It measures as 250-350L/min, argon pressure 0.3-0.4MPa.
4. LF stoves refinery practice according to claim 1, which is characterized in that the step 3 specifically includes：By electric current tune
Whole is 30000-35000A, divides 2-3 batches to add in limes, lime addition is 500-530kg, and adjustment argon flow amount is 50-100L/
Min, argon pressure 0.3-0.4MPa, then fluorite is added depending on the mobility of clinker, the adjustment clinker quantity of slag is 10-12kg/ tons of steel,
Basicity control is kept for 15 minutes or more in 2.0-3.0, white slag, FeO+MnO ＜ 1.0%.
5. LF stoves refinery practice according to claim 1, which is characterized in that the step 4 specifically includes：The top of the slag uses
Calcium carbide deoxidation, point 5 batches of addition calcium carbides carry out residue adjustment, add in the 1/5 of calcium carbide total amount every time, and every batch of calcium carbide adds in time interval 30s,
It is 1-1.5kg/ tons of steel that calcium carbide, which adds in total amount,.
6. LF stoves refinery practice according to claim 1, which is characterized in that argon flow amount is 400- in the step 5
500L/min。
7. LF stoves refinery practice according to claim 1, which is characterized in that in the step 6 during soft blow argon gas flow
For 50-60L/min.
8. LF stoves refinery practice according to claim 1, which is characterized in that ferrotianium titaniferous amount is 28- in the step 7
30%, rate of recovery 60-70%.
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