CN112593048A - Semisteel desulfurization method - Google Patents
Semisteel desulfurization method Download PDFInfo
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- CN112593048A CN112593048A CN202011447194.1A CN202011447194A CN112593048A CN 112593048 A CN112593048 A CN 112593048A CN 202011447194 A CN202011447194 A CN 202011447194A CN 112593048 A CN112593048 A CN 112593048A
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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
- C21C7/0645—Agents used for dephosphorising or desulfurising
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Abstract
The invention relates to the technical field of steel smelting, in particular to a semisteel desulfurization method. The semisteel desulfurization method comprises the following steps: A) blowing molten iron at 1300-1450 ℃ for 3-9 min under the aerobic condition; B) discharging semisteel, and adding a desulfurizing agent when the semisteel is discharged to 1/5-3/5 of the total amount of the semisteel, and performing primary desulfurization reaction to obtain the semisteel after pre-desulfurization; C) and carrying out secondary desulfurization on the semi-steel subjected to pre-desulfurization, and slagging off to obtain the desulfurized semi-steel. According to the invention, the desulfurizer is added in the tapping process, the steel flow impact kinetic energy in the tapping process is utilized, the desulfurizer is stirred to react with sulfur in semisteel, the sulfur in the semisteel is removed, the operation time is not increased in the desulfurization process, the time in the semisteel discharging process is utilized, the desulfurization treatment burden of the original desulfurization station is reduced, a part of desulfurization tasks are distributed in the tapping process of the vanadium extraction converter, the desulfurization treatment time can be reduced, and the semisteel desulfurization efficiency is higher.
Description
Technical Field
The invention relates to the technical field of steel smelting, in particular to a semisteel desulfurization method.
Background
At present, the domestic semisteel external desulfurization mainly adopts two processes of blowing desulfurization or KR desulfurization, and is mature. After the semisteel is discharged, the semisteel is directly conveyed to a desulfurization station for desulfurization treatment, the problem of long desulfurization time exists, and particularly when the molten iron sulfur reaches more than 0.08 wt%, the desulfurization process time is not matched with the smelting time of a converter and the casting machine period in the subsequent process. When the weight percentage of the molten iron sulfur is above 0.1 percent, the original desulfurization procedure even needs to be carried out for 2 times of desulfurization to remove the sulfur to the required range, and the desulfurization time is very long. Meanwhile, molten iron has high sulfur, and for extremely low sulfur steel (S is less than 0.005 wt%), the problems of serious converter resulfurization and abnormal molten steel component change exist.
Disclosure of Invention
In view of the above, the technical problem to be solved by the present invention is to provide a semisteel desulfurization method, which is short in time and high in semisteel desulfurization efficiency.
The invention provides a semisteel desulfurization method, which comprises the following steps:
A) blowing molten iron at 1300-1450 ℃ for 3-9 min under the aerobic condition;
B) discharging semisteel, and adding a desulfurizing agent when the semisteel is discharged to 1/5-3/5 of the total amount of the semisteel, and performing primary desulfurization reaction to obtain the semisteel after pre-desulfurization;
C) and carrying out secondary desulfurization on the semi-steel subjected to pre-desulfurization, and slagging off to obtain the desulfurized semi-steel.
Preferably, in the step A), the molten iron and the coolant are blown at 1300-1450 ℃ for 3-9 min under the aerobic condition;
the coolant is selected from one or more of cast pig iron, pellet ore, vanadium extraction cold pressed block and high-grade iron ore concentrate;
the mass ratio of the coolant to the molten iron is 0.1-0.5: 2 to 10.
Preferably, the desulfurizing agent comprises:
the sum of the dosage of the components is 100 percent.
Preferably, the granularity of the lime is 1-15 mm.
Preferably, the particle size of the passivated magnesium is 0.1-3 mm.
Preferably, in the step B), the sulfur content in the semisteel during semisteel tapping is 0.05 wt% to 0.18 wt%.
Preferably, in the step B), the amount of the desulfurizing agent accounts for 0.3-5 wt% of the amount of the semisteel.
Preferably, in the step B), the temperature of the desulfurization reaction is 1280-1410 ℃ and the time is 3-6 min.
Preferably, in step C), the secondary desulfurization method is injection desulfurization.
The invention provides a semisteel desulfurization method, which comprises the following steps: A) blowing molten iron at 1300-1450 ℃ for 3-9 min under the aerobic condition; B) discharging semisteel, and adding a desulfurizing agent when the semisteel is discharged to 1/5-3/5 of the total amount of the semisteel, and performing primary desulfurization reaction to obtain the semisteel after pre-desulfurization; C) and carrying out secondary desulfurization on the semi-steel subjected to pre-desulfurization, and slagging off to obtain the desulfurized semi-steel. According to the invention, the desulfurizer is added in the tapping process, the steel flow impact kinetic energy in the tapping process is utilized, the desulfurizer is stirred to react with sulfur in semisteel, the sulfur in the semisteel is removed, the operation time is not increased in the desulfurization process, the time in the semisteel discharging process is utilized, the desulfurization treatment burden of the original desulfurization station is reduced, a part of desulfurization tasks are distributed in the tapping process of the vanadium extraction converter, the desulfurization treatment time can be reduced, and the semisteel desulfurization efficiency is higher.
Drawings
FIG. 1 is a flow chart of a semisteel desulfurization process provided by one embodiment of the invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a semisteel desulfurization method, which comprises the following steps:
A) blowing molten iron at 1300-1450 ℃ for 3-9 min under the aerobic condition;
B) discharging semisteel, and adding a desulfurizing agent when the semisteel is discharged to 1/5-3/5 of the total amount of the semisteel, and performing primary desulfurization reaction to obtain the semisteel after pre-desulfurization;
C) and carrying out secondary desulfurization on the semi-steel subjected to pre-desulfurization, and slagging off to obtain the desulfurized semi-steel.
The method comprises the steps of firstly blowing molten iron at 1300-1450 ℃ for 3-9 min under the aerobic condition.
In certain embodiments of the present invention, the molten iron is vanadium-containing molten iron.
In certain embodiments of the invention, the molten iron has a sulfur content of 0.05 wt% to 0.18 wt%.
In certain embodiments of the present invention, the molten iron has a carbon content of 3.6 wt% to 4.5 wt%, a sulfur content of 0.05 wt% to 0.18 wt%, a vanadium content of 0.2 wt% to 0.4 wt%, a silicon content of 0.05 wt% to 0.5 wt%, a manganese content of 0.18 wt% to 0.3 wt%, a titanium content of 0.05 wt% to 0.3 wt%, and the balance trace elements. In certain embodiments of the invention, the molten iron has a sulfur content of 0.093 wt%, 0.106 wt%, or 0.082 wt%.
In some embodiments of the invention, the temperature of the molten iron is 1300-1450 ℃.
In some embodiments of the invention, the flow rate of oxygen in the converting process is 18000-25000 Nm3H is used as the reference value. In certain embodiments, the flow of oxygen during the converting is 22000Nm3H or 21000Nm3/h。
In some embodiments of the present invention, the molten iron and the coolant are blown at 1300 to 1450 ℃ for 3 to 9 min. In certain embodiments, the temperature of the blow is 1350 ℃. In certain embodiments, the time for the blowing is 5.6min, 6.4min, or 6 min.
In certain embodiments of the invention, the coolant is selected from one or more of cast pig iron, pellets, vanadium extraction cold briquettes, and high grade iron concentrate. In certain embodiments, the vanadium extraction cold press block is processed from iron oxide slag, fly ash and a binder. The adhesive is not particularly limited in the present invention, and an adhesive known to those skilled in the art may be used. The processing method of the present invention is not particularly limited, and a processing method known to those skilled in the art may be used.
In certain embodiments of the present invention, the mass ratio of the coolant to the molten iron is 0.1 to 0.5: 2 to 10. In certain embodiments, the coolant to molten iron mass ratio is 0.208: 2.31, 0.135: 2.24 or 0.232: 2.41.
in certain embodiments of the invention, the blowing is carried out in a rotary kiln.
And after the blowing is finished, discharging semisteel, and adding a desulfurizing agent when the semisteel is discharged to 1/5-3/5 of the total amount of the semisteel, and performing preliminary desulfurization reaction to obtain the semisteel after pre-desulfurization.
Preferably, the method specifically comprises the following steps: and after blowing is finished, discharging semisteel, pouring the semisteel in the converter into a ladle, and adding a desulfurizing agent into the ladle when the semisteel is discharged to 1/5-3/5 of the total amount of the semisteel, and performing primary desulfurization reaction to obtain the semisteel subjected to pre-desulfurization.
In certain embodiments of the present invention, the desulfurizing agent comprises:
the sum of the dosage of the components is 100 percent.
The desulfurizer provided by the invention comprises lime. In certain embodiments of the invention, the lime content of the desulfurizing agent is 78 wt%, 82 wt%, or 65 wt%. In some embodiments of the invention, the lime has a particle size of 1 to 15 mm. In some embodiments, the lime has a particle size of 1 to 5 mm.
The desulfurizer provided by the invention also comprises sodium carbonate. In certain embodiments of the present invention, the sodium carbonate content of the desulfurizing agent is 5 wt% or 15 wt%. In certain embodiments of the invention, the sodium carbonate is industrial sodium carbonate, the industrial sodium carbonate is in powder form, and the relevant indexes meet the national standard GB210-92, and the particle size is less than 180 μm.
The desulfurizer provided by the invention also comprises passivated magnesium. In certain embodiments of the invention, the passivated magnesium content of the desulfurization agent is 7 wt.%, 5 wt.%, or 8 wt.%. In certain embodiments of the present invention, the passivated magnesium has a particle size of 0.1 to 3 mm.
The desulfurizer provided by the invention also comprises calcium fluoride. In certain embodiments of the present invention, the content of calcium fluoride in the desulfurizing agent is 2 wt% or 5 wt%.
The desulfurizer provided by the invention also comprises silicon dioxide. In certain embodiments of the invention, the amount of silica in the desulfurizing agent is 8 wt.%, 4 wt.%, or 7 wt.%.
The method for preparing the desulfurizing agent is not particularly limited, and in some embodiments of the present invention, the desulfurizing agent is prepared according to the following method:
mixing lime, sodium carbonate, passivated magnesium, calcium fluoride and silicon dioxide to obtain the desulfurizer.
The raw material components and the proportion used in the preparation method of the desulfurizer are the same as above, and are not described again.
In certain embodiments of the invention, the sulfur content in the semisteel at the time of tapping is between 0.05 wt% and 0.18 wt%. In certain embodiments, the sulfur content in the semisteel as it emerges is 0.093 wt%, 0.106 wt%, or 0.082 wt%.
In certain embodiments of the invention, the desulfurizing agent is used in an amount of 0.3 wt% to 5 wt% based on the amount of the semisteel. In certain embodiments, the desulfurizing agent is present in an amount of 0.4 wt.%, 0.55 wt.%, or 0.38 wt.% of the semisteel.
In some embodiments of the invention, the temperature of the desulfurization reaction is 1280-1410 ℃ and the time is 3-6 min. In certain embodiments, the temperature of the desulfurization reaction is 1330 ℃, 1340 ℃, or 1347 ℃. In certain embodiments, the time for the desulfurization reaction is 4min, 4.2min, or 4.7 min.
According to the invention, the desulfurizer is added in the tapping process, the steel flow impact kinetic energy in the tapping process is utilized, the desulfurizer is stirred to react with sulfur in semisteel, the sulfur in the semisteel is removed, the operation time is not increased in the desulfurization process, the time in the semisteel discharging process is utilized, the desulfurization treatment burden of the original desulfurization station is reduced, a part of desulfurization tasks are distributed in the tapping process of the vanadium extraction converter, and the desulfurization treatment time can be reduced.
And after the pre-desulfurized semisteel is obtained, carrying out secondary desulfurization on the pre-desulfurized semisteel, and slagging off to obtain the desulfurized semisteel.
In certain embodiments of the invention, the method of secondary desulfurization is injection desulfurization. The method of the present invention for the injection desulfurization is not particularly limited, and a method of the injection desulfurization known to those skilled in the art may be used. In certain embodiments of the present invention, the blown desulfurization agent used for the blown desulfurization includes passivated lime and passivated magnesium. In some embodiments of the invention, the mass ratio of the blowing desulfurizer to the pre-desulfurized semi-steel is 3-7: 1000-1200. In certain embodiments, the mass ratio of the blowing desulfurizer to the pre-desulfurized semi-steel is 4.7: 1000. 5.48: 1000 or 3.19: 1000.
in some embodiments of the invention, the time for blowing desulfurization is 19-26 min. In certain embodiments, the time for the injection desulfurization is 21.5min, 25.5min, or 19.2 min.
The method for skimming is not particularly limited in the present invention, and may be a method for skimming well known to those skilled in the art.
Although the invention increases a primary desulfurization task, the total working procedure time of the working procedure is shortened, and the semisteel desulfurization efficiency is higher.
The source of the above-mentioned raw materials is not particularly limited in the present invention, and may be generally commercially available.
FIG. 1 is a flow chart of a semisteel desulfurization process provided by one embodiment of the invention.
In order to further illustrate the present invention, the method for desulfurizing semisteel provided by the present invention will be described in detail with reference to the following examples, which should not be construed as limiting the scope of the present invention.
The starting materials used in the following examples are all commercially available.
Example 1
The desulfurizing agent comprises:
the granularity of the lime is 1-5 mm, and the granularity of the passivated magnesium is 0.1-3 mm.
The semisteel desulfurization method comprises the following steps:
pouring molten iron (the molten iron amount is 231 tons, the molten iron sulfur is 0.093wt percent, the molten iron temperature is 1321 ℃) into a converter, and blowing oxygen into the converter by using an oxygen lance, wherein the oxygen blowing flow is 22000Nm3And h, simultaneously adding a coolant (11 tons of cast pig iron, 8.3 tons of vanadium extraction cold pressing blocks and 1.5 tons of pellet ores), controlling the temperature in the furnace to 1350 ℃ and blowing for 5.6 min. And (3) after blowing, discharging semisteel (the sulfur content in the semisteel is 0.093 wt%) from the converter, slowly pouring the semisteel in the converter into a ladle, adding the desulfurizing agent (the amount of the desulfurizing agent accounts for 0.4 wt% of the amount of the semisteel) into the ladle when the semisteel is discharged to 2/5 of the total amount of the semisteel, and primarily desulfurizing at 1330 ℃ for 4min to obtain the semisteel after pre-desulfurization.
And (3) carrying out blowing desulfurization on the semi-steel after pre-desulfurization (blowing desulfurizer comprises 890kg of passivated lime and 210kg of passivated magnesium, the mass ratio of the blowing desulfurizer to the semi-steel after pre-desulfurization is 4.7: 1000, and the desulfurization time is 21.5min), and slagging off to obtain the semi-steel after desulfurization.
A carbon-sulfur analyzer CS744 produced by LECO Likeco company is adopted to analyze according to a standard GB/T20123-2006 infrared absorption method for measuring the total carbon and sulfur content of steel after combustion in a high-frequency induction furnace, and the result shows that the sulfur content in the semisteel after pre-desulfurization is 0.061 wt%, and the removal rate of sulfur is 34.4%.
A carbon-sulfur analyzer CS744 produced by LECO Strength corporation is adopted to analyze according to a standard GB/T20123-2006 infrared absorption method for measuring the total carbon and sulfur content of steel after combustion in a high-frequency induction furnace, and the result shows that the sulfur content in the desulfurized semisteel is 0.003 wt%, and the sulfur removal rate is 96.77%.
Example 2
The desulfurizing agent comprises:
the granularity of the lime is 1-5 mm, and the granularity of the passivated magnesium is 0.1-3 mm.
The semisteel desulfurization method comprises the following steps:
pouring molten iron (the molten iron amount is 224 tons, the molten iron sulfur is 0.106 weight percent, the molten iron temperature is 1294 ℃) into a converter, and blowing oxygen into the converter by using an oxygen lance, wherein the oxygen blowing flow is 22000Nm3And h, simultaneously adding a coolant (6 tons of cast pig iron, 6.5 tons of vanadium extraction cold pressing blocks and 1.0 ton of pellet), controlling the temperature in the furnace within 1350 ℃ and blowing for 6.4 min. And (3) after blowing is finished, discharging semisteel (the sulfur content in the semisteel during semisteel discharging is 0.106 wt%), slowly pouring the semisteel in the converter into a ladle, adding a desulfurizing agent (the amount of the desulfurizing agent accounts for 0.55 wt% of the amount of the semisteel) into the ladle when the semisteel is discharged to 2/5% of the total amount of the semisteel, and primarily desulfurizing at 1340 ℃ for 4.2min to obtain the semisteel after pre-desulfurization.
And (3) carrying out blowing desulfurization on the semi-steel after pre-desulfurization (blowing desulfurizer comprises 986kg of passivated lime and 243kg of passivated magnesium, the mass ratio of the blowing desulfurizer to the semi-steel after pre-desulfurization is 5.48: 1000, and the desulfurization time is 25.5min), and slagging off to obtain the semi-steel after desulfurization.
A carbon-sulfur analyzer CS744 produced by LECO Likeco company is adopted to analyze according to a standard GB/T20123-2006 infrared absorption method for measuring the total carbon and sulfur content of steel after combustion in a high-frequency induction furnace, and the result shows that the sulfur content in the semi-steel after pre-desulfurization is 0.064 wt%, and the sulfur removal rate is 39.6%.
A carbon-sulfur analyzer CS744 produced by LECO Likeco company is adopted to analyze according to a standard GB/T20123-2006 infrared absorption method for measuring the total carbon and sulfur content of steel after combustion in a high-frequency induction furnace, and the result shows that the sulfur content is 0.004 wt% and the removal rate of sulfur is 96.2%.
Example 3
The desulfurizing agent comprises:
the granularity of the lime is 1-5 mm, and the granularity of the passivated magnesium is 0.1-3 mm.
The semisteel desulfurization method comprises the following steps:
molten iron (the molten iron amount is 241 tons, the molten iron sulfur is 0.082 wt%, the molten iron temperature is 1317 ℃) is poured into the converter, oxygen is blown into the converter by an oxygen lance, and the oxygen blowing flow is 21000Nm3And h, simultaneously adding a coolant (12 tons of cast pig iron, 9.2 tons of vanadium extraction cold pressing blocks and 2 tons of pellet ores), controlling the temperature in the furnace within 1350 ℃ and converting for 6 min. And after blowing, discharging semisteel (the sulfur content in the semisteel during semisteel discharging is 0.082 wt%), slowly pouring the semisteel in the converter into a ladle, adding a desulfurizing agent (the amount of the desulfurizing agent accounts for 0.38 wt% of the amount of the semisteel) into the ladle when the semisteel is discharged to 2/5 of the total amount of the semisteel, and primarily desulfurizing at 1347 ℃ for 4.7min to obtain the semisteel after pre-desulfurization.
And (3) carrying out blowing desulfurization on the semisteel subjected to pre-desulfurization (the blowing desulfurizer comprises 587kg of passivated lime and 182kg of passivated magnesium, the mass ratio of the blowing desulfurizer to the semisteel subjected to pre-desulfurization is 3.19: 1000, and the desulfurization time is 19.2min), and slagging off to obtain the semisteel subjected to desulfurization.
A carbon-sulfur analyzer CS744 produced by LECO Likeka company is adopted to analyze according to a standard GB/T20123-2006 infrared absorption method for measuring the total carbon and sulfur content of steel and iron after combustion in a high-frequency induction furnace, and the result shows that the sulfur content is 0.053 wt% and the removal rate of sulfur is 35.4%.
A carbon-sulfur analyzer CS744 produced by LECO Likeco company is adopted to analyze according to a standard GB/T20123-2006 infrared absorption method for measuring the total carbon and sulfur content of steel and iron after combustion in a high-frequency induction furnace, and the result shows that the sulfur content is 0.002 wt% and the removal rate of sulfur is 97.6%.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. A semisteel desulfurization method comprises the following steps:
A) blowing molten iron at 1300-1450 ℃ for 3-9 min under the aerobic condition;
B) discharging semisteel, and adding a desulfurizing agent when the semisteel is discharged to 1/5-3/5 of the total amount of the semisteel, and performing primary desulfurization reaction to obtain the semisteel after pre-desulfurization;
C) and carrying out secondary desulfurization on the semi-steel subjected to pre-desulfurization, and slagging off to obtain the desulfurized semi-steel.
2. The semisteel desulfurization method according to claim 1, wherein in the step a), molten iron and a coolant are blown at 1300 to 1450 ℃ for 3 to 9min under an aerobic condition;
the coolant is selected from one or more of cast pig iron, pellet ore, vanadium extraction cold pressed block and high-grade iron ore concentrate;
the mass ratio of the coolant to the molten iron is 0.1-0.5: 2 to 10.
3. The semisteel desulfurization method according to claim 1, wherein the desulfurizing agent comprises:
the sum of the dosage of the components is 100 percent.
4. The semisteel desulfurization method according to claim 3, wherein the lime has a particle size of 1 to 15 mm.
5. The semisteel desulfurization method according to claim 3, wherein the passivated magnesium has a particle size of 0.1 to 3 mm.
6. The method for desulfurizing semisteel according to claim 4, wherein in the step B), the sulfur content in the semisteel at the time of semisteel tapping is 0.05 wt% to 0.18 wt%.
7. The semisteel desulfurization method according to claim 4, wherein the desulfurizing agent is used in an amount of 0.3 to 5 wt% based on the amount of the semisteel in step B).
8. The semisteel desulfurization method according to claim 4, wherein in the step B), the temperature of the desulfurization reaction is 1280 ℃ to 1410 ℃ for 3 to 6 min.
9. The method for desulfurizing semisteel according to claim 4, wherein in the step C), the method for secondary desulfurization is injection desulfurization.
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