CN115287407A - Method for controlling slag splashing of continuous casting residue recovery - Google Patents
Method for controlling slag splashing of continuous casting residue recovery Download PDFInfo
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- CN115287407A CN115287407A CN202210955444.5A CN202210955444A CN115287407A CN 115287407 A CN115287407 A CN 115287407A CN 202210955444 A CN202210955444 A CN 202210955444A CN 115287407 A CN115287407 A CN 115287407A
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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
- C21C7/072—Treatment with gases
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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
- C21C7/0006—Adding metallic additives
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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
- C21C7/076—Use of slags or fluxes as treating agents
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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
- C21C7/10—Handling in a vacuum
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
The invention provides a method for controlling slag splashing of continuous casting residue recovery, which comprises the following steps: arranging a sliding plate on the converter for slag blocking, and opening the bottom of a steel ladle to blow argon 2-3 min before tapping; when tapping, when the molten steel reaches one third of the steel ladle amount, sequentially adding 2.0-2.8 kg/t of lime powder, 0.2-0.4 kg/t of quartz sand and 0.4-0.6 kg/t of fluorite balls; when the steel tapping amount reaches 80 percent, closing bottom-blown argon, and simultaneously feeding a slag stopping cone into the converter; after tapping, carrying out temperature measurement, sampling and oxygen determination, and then hoisting to an RH process; controlling the temperature of molten steel to be 1610-1630 ℃ when reaching the RH process, wherein the oxygen content of the molten steel is 400-600 ppm; after the RH treatment was completed, aluminum particles were added to the ladle. The reduction of the splashing amount reduces the loss of steel materials, increases the waste heat recovery and simultaneously basically solves the risk of major safety accidents caused by the overflow of high-temperature melt.
Description
Technical Field
The invention relates to the technical field of converter steelmaking, in particular to a method for controlling continuous casting residue recovery, slag emission and splashing.
Background
In the process of continuously casting the automobile plate, because the upper part of molten steel is contacted with the top slag and is influenced by strong oxidizability of the top slag and a large amount of impurities in the slag, the upper part of molten steel contacted with the top slag is polluted, the quality of the upper layer of molten steel is influenced, and in order to ensure the quality of casting a billet, a ladle is lifted away in advance when the rest part of molten steel is poured. The method for saving the consumption and heat of the iron and steel materials is adopted for the molten steel and the residual slag after the casting: the continuous casting residual-heat recovery method is used for recovering residual heat and steel materials. However, when the residual molten steel is poured into the molten iron ladle, oxygen-containing substances in the top slag react with carbon in the molten iron to generate a large amount of gas, the gas is discharged to drive the foam slag on the upper layer of the molten iron ladle to gush out of the molten iron ladle, high-temperature melt overflow is easily caused, the risk of major safety accidents is caused, the loss of steel materials can be caused due to the ejection of a large amount of foam slag, and the effect of the residual casting recovery process can be weakened.
In summary, the following problems exist in the prior art: when the residual molten steel is poured into the molten iron ladle, slag overflow and splashing can occur.
Disclosure of Invention
The invention aims to solve the problem of avoiding slag overflow and splashing when pouring residual molten steel into a molten iron ladle.
Therefore, the embodiment of the invention provides a method for controlling slag splashing of continuous casting residue recovery, which comprises the following steps:
arranging a sliding plate on the converter for slag blocking, and opening the bottom of a steel ladle to blow argon 2-3 min before tapping;
when tapping, when the molten steel reaches one third of the steel ladle amount, sequentially adding 2.0-2.8 kg/t of lime powder, 0.2-0.4 kg/t of quartz sand and 0.4-0.6 kg/t of fluorite balls;
when the steel tapping amount reaches 80 percent, closing bottom-blown argon, and simultaneously feeding a slag stopping cone into the converter; after tapping, carrying out temperature measurement, sampling and oxygen determination, and then hoisting to an RH process;
controlling the temperature of molten steel to be 1610 to 1630 ℃ when the molten steel reaches the RH process, wherein the oxygen content of the molten steel is 400 to 600ppm;
after the RH treatment was completed, aluminum particles were added to the ladle.
Specifically, the bottom of the steel ladle is opened 2-3 min before tapping, argon gas is blown through a single pipe controlled at 700-900 Nl/min, and the bottom blowing flow is adjusted to be controlled at 150-250 Nl/min through the single pipe after lime powder, quartz sand and fluorite balls are added into the steel ladle and melted.
Specifically, the RH process vacuum treatment is carried out in a deep decarburization mode, the flow of argon is lifted by the dip pipe to be controlled at 130-150 Nl/min, the bottom blowing of argon is opened by the ladle, and the flow of bottom blowing is controlled at 50-100 Nl/min.
Specifically, in the RH process treatment process, the oxygen temperature rise is less than or equal to 10 percent, and the cycle time after deoxidation is more than 3 minutes.
Specifically, after RH decarburization is finished, the oxygen content of molten steel is controlled to be 350-450 ppm.
Specifically, after the RH treatment is finished, aluminum particles are added into the ladle so that the carbon content is less than 10ppm after the molten steel treatment is finished.
Specifically, after the RH treatment is completed, 0.2 to 0.3kg/t of aluminum particles are added and spread on the surface of the molten steel top slag.
Specifically, after the RH treatment is finished, according to different converter end point oxygen, adding aluminum particles into a steel ladle after the liquid level of molten steel is calm, specifically:
when the end point oxygen is less than or equal to 500ppm, adding 50kg of aluminum particles;
when the end point oxygen is 500-600ppm, 60kg of aluminum particles are added;
when the end point oxygen is 600-700ppm, 70kg of aluminum particles are added.
Specifically, after the aluminum particles are added for top slag modification, the content of the components is controlled to be more than or equal to 40 percent of CaO and Al 2 O 3 ≤30％，T.Fe≤7％。
Specifically, the method is suitable for the applied production steel grade and comprises the following components: c: less than or equal to 0.0015 percent; si: less than or equal to 0.02 percent; mn: less than or equal to 0.15 percent; p: less than or equal to 0.015 percent; s is less than or equal to 0.012 percent; al:0.025% -0.045%, and the method specifically comprises the following steps:
changing slag for the first time of converter tapping: the steel is put in front of the furnace by adopting a double slag blocking mode, a sliding plate blocks slag and a slag blocking cone, and the circular flow and non-diffusion flow state of a steel tapping hole is ensured, and the steel tapping time is required to be 4 min; simultaneously, when the molten steel reaches one third of the steel ladle amount, 2.0-2.8 kg/t of lime powder, 0.2-0.4 kg/t of quartz sand and 0.4-0.6 kg/t of fluorite balls are added; after tapping, according to different oxygen at the end point of the converter, 0.3-0.45 kg/t of aluminum particles are added into a ladle after the liquid level of the molten steel is calm, and the added aluminum particles are required to be uniformly spread on the surface of the molten steel;
in the method, the ladle bottom blowing is controlled by large flow at the stage of adding lime powder, quartz sand and fluorite successively during the tapping process, a single pipe is controlled at 700-900 Nl/min, the bottom blowing is adjusted to small flow control after the added modified material is melted, the single pipe is controlled at 150-250 Nl/min, the bottom blowing argon valve is closed after the tapping amount reaches 80 percent, the temperature is ensured to be 1610-1630 ℃ when the steel reaches an RH station, and the oxygen content of the molten steel is 400-600 ppm;
RH vacuum treatment adopts a deep decarburization mode to produce, an immersion pipe lifts argon gas and controls the argon gas at 130-150 Nl/min, the circulating flow of molten steel is increased, the bottom of a steel ladle is opened to blow argon gas during decarburization, the flow of the rising side of the corresponding immersion pipe is controlled at 50-100 Nl/min, molten steel circulation is promoted, the dead zone of the molten steel in the steel ladle is reduced, the oxygen temperature rise operation is less than or equal to 10 percent in the treatment process, the circulating time is longer than 3 minutes after deoxidation, the oxygen content of the molten steel is 350-450 ppm after decarburization is finished, aluminum particles are added for deoxidation alloying, and the carbon content of the molten steel is ensured to be less than 10ppm after the molten steel treatment is finished;
two timesThe top slag modification comprises the following specific operation steps: after RH treatment is finished, 0.2-0.3 kg/t of aluminum particles are uniformly added and uniformly spread on the surface of molten steel top slag to remove the residual oxygen of the top slag, the modified top slag contains more than or equal to 40 percent of CaO as the main target component and Al 2 O 3 ≤30％，T.Fe≤7％。
The beneficial effects are that: the invention reduces the average content of T.Fe in the top slag of the continuous casting residue from 11.7% to 6.5%, greatly reduces the oxidability of the top slag, reduces the proportion of the number of splashed furnaces from 72% to 15.5%, and reduces the average amount of single splashing from 1.8t to 0.4t. The reduction of the splashing amount reduces the loss of steel materials, increases the waste heat recovery, basically solves the risk of major safety accidents caused by overflow of high-temperature melt, and has the advantages of low process cost and good effect.
Drawings
FIG. 1 is a flow chart of a method for controlling slag splashing of continuous casting residue recovery provided by the embodiment of the invention;
FIG. 2 is a view illustrating a situation in which the molten steel remaining in the comparative example is poured into the molten iron ladle according to the embodiment of the present invention;
FIG. 3 is a view showing the situation where the molten steel remaining after the casting according to the first embodiment of the present invention is poured into the molten iron ladle.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious 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.
In an embodiment of the present invention, as shown in fig. 1, there is provided a method for controlling slag splashing in continuous casting residue recovery, the method including the following steps:
arranging a sliding plate on the converter for slag blocking to ensure the circular flow and non-diffusion flow state of a steel tapping hole, opening the bottom of a steel ladle to blow argon 2-3 min before tapping, driving air in the steel ladle, avoiding nitrogen absorption of molten steel, and ensuring the opening of an argon valve to be 100%;
when tapping, when molten steel reaches one third of the steel ladle amount (tapping time is about 4 min), sequentially adding 2.0-2.8 kg/t of lime powder, 0.2-0.4 kg/t of quartz sand and 0.4-0.6 kg/t of fluorite balls;
when the steel tapping amount reaches 80 percent, closing bottom blowing argon, and simultaneously feeding a slag stopping cone into the converter; after tapping, carrying out temperature measurement, sampling and oxygen determination, and then hoisting to an RH process; and after the steel tapping amount reaches 80%, closing a bottom blowing argon valve, ensuring that the temperature is 1610 to 1630 ℃ when the steel reaches an RH station, and the oxygen content of the molten steel is 400 to 600ppm.
Controlling the temperature of molten steel to be 1610 to 1630 ℃ when the molten steel reaches the RH process, wherein the oxygen content of the molten steel is 400 to 600ppm;
after the RH treatment was completed, aluminum particles were added to the ladle. And after tapping, according to different oxygen at the end point of the converter, adding 0.3-0.45 kg/t of aluminum particles into the steel ladle after the liquid level of the molten steel is calm, and requiring that the added aluminum particles are uniformly spread on the surface of the molten steel.
Opening the bottom of the steel ladle to blow argon 2-3 min before tapping, controlling the argon blowing single tube at 700-900 Nl/min, and controlling the bottom blowing flow at 150-250 Nl/min by adjusting the bottom blowing flow as the single tube after the added lime powder, quartz sand and fluorite balls are melted.
The RH process vacuum treatment is carried out by adopting a deep decarburization mode, the flow of argon is increased by the dip pipe to be controlled at 130-150 Nl/min, the circulating flow of molten steel is increased, the bottom blowing of the steel ladle is opened, the flow of the bottom blowing is controlled at 50-100 Nl/min, the circulation of the molten steel is promoted, and the dead zone of the molten steel in the steel ladle is reduced.
In the RH procedure treatment process, the temperature rise of oxygen is less than or equal to 10 percent, and the cycle time after deoxidation is more than 3 minutes.
And after RH decarburization is finished, controlling the oxygen content of the molten steel to be 350-450 ppm.
After the RH treatment is finished, aluminum particles are added into the ladle so that the carbon content is less than 10ppm after the molten steel treatment is finished.
After RH treatment is finished, 0.2-0.3 kg/t of aluminum particles are added and uniformly spread on the surface of the molten steel top slag.
After RH treatment is finished, according to different oxygen at the end point of the converter, adding aluminum particles into a steel ladle after the liquid level of molten steel is calm, and the method specifically comprises the following steps:
when the end point oxygen is less than or equal to 500ppm, adding 50kg of aluminum particles;
when the end point oxygen is 500-600ppm, 60kg of aluminum particles are added;
when the end point oxygen is 600-700ppm, 70kg of aluminum particles are added.
After the aluminum particles are added for top slag modification, the content of the components is controlled to be more than or equal to 40 percent of CaO and Al 2 O 3 ≤30％，T.Fe≤7％。
The method is suitable for producing steel grades in the following component ranges: c: less than or equal to 0.0015 percent; si: less than or equal to 0.02 percent; mn: less than or equal to 0.15 percent; p: less than or equal to 0.015 percent; s is less than or equal to 0.012 percent; al:0.025% -0.045%, and the method specifically comprises the following steps:
the first slag changing of converter tapping: the steel is discharged in front of the furnace in a double slag blocking mode, a sliding plate blocks slag and a slag blocking cone, and the circular flow and non-diffusion state of a steel outlet is ensured, and the steel tapping time is required to be 4 min; simultaneously, when the molten steel reaches one third of the steel ladle amount, 2.0-2.8 kg/t of lime powder, 0.2-0.4 kg/t of quartz sand and 0.4-0.6 kg/t of fluorite balls are added; after tapping, according to different oxygen at the end point of the converter, 0.3-0.45 kg/t of aluminum particles are added into a ladle after the liquid level of the molten steel is calm, and the added aluminum particles are required to be uniformly spread on the surface of the molten steel;
in the method, the bottom blowing of the steel ladle is controlled at a large flow rate at the stage of adding lime powder, quartz sand and fluorite successively in the tapping process, a single pipe is controlled at 700-900 Nl/min, the bottom blowing is adjusted to be controlled at a small flow rate after the added modified materials are melted, the single pipe is controlled at 150-250 Nl/min, the bottom blowing argon valve is closed after the tapping amount reaches 80 percent, the temperature is ensured to be at 1610-1630 ℃ when the steel reaches an RH station, and the oxygen content of the molten steel is 400-600 ppm;
RH vacuum treatment adopts a deep decarburization mode for production, an immersion pipe promotes argon to be controlled at 130-150 Nl/min, the circulating flow of molten steel is increased, the bottom of a steel ladle is opened during decarburization to blow argon, the flow of the ascending side of the corresponding immersion pipe is controlled at 50-100 Nl/min, molten steel circulation is promoted, the dead zone of the molten steel in the steel ladle is reduced, the oxygen temperature rise operation is less than or equal to 10 percent in the treatment process, the circulation time is more than 3 minutes after deoxidation, the oxygen content of the molten steel is 350-450 ppm after decarburization is finished, aluminum particles are added for deoxidation alloying, and the carbon content of the molten steel is ensured to be below 10ppm after the molten steel treatment is finished;
the specific operation steps of secondary top slag modification are as follows: after RH treatment is finished, 0.2-0.3 kg/t of aluminum particles are uniformly added and uniformly spread on the surface of molten steel top slag to remove the residual oxygen of the top slag, the modified top slag contains more than or equal to 40 percent of CaO as the main target component and Al 2 O 3 ≤30％，T.Fe≤7％。
The invention reduces the average content of T.Fe in the top slag of the continuous casting residue from 11.7% to 6.5%, greatly reduces the oxidability of the top slag, reduces the proportion of the number of splashed furnaces from 72% to 15.5%, and reduces the average amount of single splashing from 1.8t to 0.4t. The reduction of the splashing amount reduces the loss of steel materials, increases the waste heat recovery, basically solves the risk of major safety accidents caused by overflow of high-temperature melt, and has the advantages of low process cost and good effect.
Example 1:
the invention discloses a method for controlling slag splashing of continuous casting residue recovery, which comprises the following steps:
s1: the first slag changing of converter tapping: the steel is discharged in front of the converter in a double-slag-blocking mode, the sliding plate slag blocking and the slag blocking cone are both arranged on the converter, the circular flow and non-diffusion state of a steel outlet is ensured, and the steel tapping time is required to be about 4 min; simultaneously, when the molten steel reaches one third of the steel ladle amount, 2.0-2.8 kg/t of lime powder, 0.2-0.4 kg/t of quartz sand and 0.4-0.6 kg/t of fluorite balls are added; after tapping, according to different oxygen at the end point of the converter, 0.3-0.45 kg/t of aluminum particles are added into the steel ladle after the liquid level of the molten steel is calm, and the added aluminum particles are required to be uniformly spread on the surface of the molten steel;
s2: in the method, the ladle bottom blowing is controlled by large flow at the stage of adding lime powder, quartz sand and fluorite successively during tapping, a single pipe is controlled at 700-900 Nl/min, the bottom blowing is adjusted to be controlled by small flow after the added modified material is melted, the single pipe is controlled at 150-250 Nl/min, the bottom blowing argon valve is closed after the tapping amount reaches 80 percent, the temperature is ensured to be 1610-1630 ℃ when the steel reaches an RH station, and the oxygen content of the molten steel is 400-600 ppm.
S3: RH vacuum treatment adopts a deep decarburization mode for production, an immersion pipe lifts argon gas and controls the argon gas at 130-150 Nl/min, molten steel circulation flow is increased, steel ladle bottom argon blowing is opened during decarburization, the flow rate of the rising side of the immersion pipe is controlled at 50-100 Nl/min correspondingly, molten steel circulation is promoted, the dead zone of the molten steel in the steel ladle is reduced, oxygen temperature rise operation is less than or equal to 10% in the treatment process, the circulation time after deoxidation is more than 3 minutes, the oxygen content of the molten steel is 350-450 ppm after decarburization is finished, and aluminum particles are added for deoxidation and alloying. Ensuring that the carbon content is below 10ppm after the molten steel treatment.
S4: the specific operation steps for performing secondary top slag modification are as follows: after RH treatment is finished, 0.2-0.3 kg/t of aluminum particles are uniformly added and uniformly spread on the surface of the molten steel top slag, the residual oxygen of the top slag is removed, and the modified top slag mainly comprises CaO more than or equal to 40%, al2O3 less than or equal to 30% and T.Fe less than or equal to 7%.
Aiming at different end points of oxygen after the steel is tapped in the step S1. And setting three aluminum adding models according to the slag amount after tapping: adding 50kg of aluminum particles when the end point oxygen is less than or equal to 500 ppm; adding 60kg of aluminum particles into 500-600ppm of final oxygen; 70kg of aluminum pellets were added at a final oxygen level of 600-700ppm and added uniformly.
Aiming at the step S2, the end point temperature of the converter is controlled by the first furnace according to the temperature of 1680 ℃, the temperature of the steel tapping is timely adjusted according to the temperature drop condition when the temperature of the later furnace is not lower than 1660 ℃, the end point oxygen is controlled to be 600-750 ppm, the slag quantity after the casting is large, the carbon pulling at the end point is noticed to not cause the complementary blowing, and finally the residual oxygen of the molten steel after argon is 400-600 ppm.
It is to be noted that the method is suitable for the application of the ranges of the steel grade compositions: c: less than or equal to 0.0015 percent; si: less than or equal to 0.02 percent; mn: less than or equal to 0.15 percent; p: less than or equal to 0.015 percent; s is less than or equal to 0.012 percent; al:0.025 to 0.045 percent.
Example 2:
smelting LG15-1R in No. 7 furnace (150-ton converter) of a willow steel converter, taking 21B704381 furnace as an example, tapping time is 247s, fully opening a ladle bottom to blow argon before tapping, adding 350kg of lime, 40kg of quartz sand and 60kg of fluorite balls when the tapping amount is 1/3, closing a bottom-blowing argon valve to 1/4 of opening degree after slag charge is melted, and tapping time is determined when the tapping amount is 1/4And when about 200s, closing bottom blowing argon until tapping is finished, observing that the TSO detects that the end point oxygen is 566ppm and the end point temperature is 1668 ℃, and adding 60kg of aluminum particles into the ladle. Then the steel ladle is transported to a RH vacuum treatment 1# station by a traveling crane and a ladle car for deep decarburization, an immersion pipe is opened to lift argon, the flow is controlled to be about 130Nl/min, the ladle bottom is fully opened to blow argon, the net cycle time after deoxidation alloying is longer than 3 minutes, and sampling is carried out after decarburization is finished to detect the oxygen content of molten steel as 386ppm and C:0.000015, temperature: 1596 deg.C. And uniformly spreading 35kg of aluminum particles on the surface of the molten steel in the ladle. The slag sample taken by the furnace is detected to become CaO:41.02% of Al 2 O 3 ：26.6％，T.Fe：6.58％。
TABLE 1 TFe content Change Table before and after application
The invention reduces the average content of T.Fe in the continuous casting residual top slag from 11.7% to 6.5%, greatly reduces the oxidability of the top slag, reduces the proportion of the number of splashed furnaces from 72.72% to 15.5%, and reduces the average single-time splashing amount from 1.8t to 0.4t. The reduction of the splashing amount reduces the loss of steel materials, increases the waste heat recovery, basically solves the risk of major safety accidents caused by overflow of high-temperature melt, and has the advantages of low process cost and good effect.
The above description is only an exemplary embodiment of the present invention, and is not intended to limit the scope of the present invention. In order that the components of the present invention may be combined without conflict, it is within the scope of the present invention that any person skilled in the art may make equivalent changes and modifications without departing from the spirit and principle of the present invention.
Claims (10)
1. A method for controlling slag splashing of continuous casting residue recovery is characterized by comprising the following steps:
arranging a sliding plate on the converter for slag blocking, and opening the bottom of a steel ladle to blow argon 2-3 min before tapping;
when tapping, when molten steel reaches one third of the steel ladle amount, 2.0-2.8 kg/t of lime powder, 0.2-0.4 kg/t of quartz sand and 0.4-0.6 kg/t of fluorite balls are sequentially added;
when the steel tapping amount reaches 80 percent, closing bottom blowing argon, and simultaneously feeding a slag stopping cone into the converter; after tapping, carrying out temperature measurement, sampling and oxygen determination, and then hoisting to an RH process;
controlling the temperature of molten steel to be 1610 to 1630 ℃ when the molten steel reaches the RH process, wherein the oxygen content of the molten steel is 400 to 600ppm;
after the RH treatment is completed, aluminum particles are added to the ladle.
2. The method for controlling the slag splashing during the continuous casting residue recovery and the slag overflow of the claim 1, wherein the bottom blowing argon gas is opened 2-3 min before the tapping, the argon gas blowing single tube is controlled at 700-900 Nl/min, and the bottom blowing flow is adjusted to be 150-250 Nl/min by the single tube after the added lime powder, quartz sand and fluorite balls are melted.
3. The method for controlling the slag splashing in the continuous casting residue recovery of the claim 1, wherein the RH process vacuum treatment is performed in a deep decarburization mode, the flow of argon gas lifted by the dip pipe is controlled to be 130-150 Nl/min, the bottom blowing of the ladle is opened, and the flow of the bottom blowing is controlled to be 50-100 Nl/min.
4. The method for controlling the slag splashing in the continuous casting residue recovery according to claim 3, wherein in the RH process treatment process, the temperature rise of oxygen is less than or equal to 10 percent, and the cycle time after the deoxidation is more than 3 minutes.
5. The method for controlling the slag tapping and splashing in the continuous casting residue recovery as claimed in claim 4, wherein the oxygen content of the molten steel is controlled to be 350-450 ppm after RH decarburization is finished.
6. The method for controlling the slag splashing in the continuous casting residue recovery according to claim 1, wherein after the RH treatment is finished, aluminum particles are added into the ladle so that the carbon content is less than 10ppm after the molten steel treatment is finished.
7. The method for controlling slag splashing in the recovery of continuous casting residue as claimed in claim 6, wherein 0.2-0.3 kg/t of aluminum particles are added after RH treatment and spread on the surface of the molten steel top slag.
8. The method for controlling the slag splashing of the continuous casting residue recovery, which is caused by the slag overflow, according to the difference of the converter terminal oxygen after the RH processing is finished, adding aluminum particles into a steel ladle after the liquid level of molten steel is calm, which is characterized by comprising the following steps:
when the end point oxygen is less than or equal to 500ppm, adding 50kg of aluminum particles;
when the end point oxygen is 500-600ppm, 60kg of aluminum particles are added;
when the end point oxygen is 600-700ppm, 70kg of aluminum particles are added.
9. The method for controlling the slag splashing during the recycling of the continuous casting residue as claimed in claim 7, wherein the content of CaO is controlled to be more than or equal to 40% and Al is controlled to be more than or equal to 40% after the aluminum particles are added for top slag modification 2 O 3 ≤30％，T.Fe≤7％。
10. The method for controlling slag splashing of continuous casting residue recycling according to claim 1, wherein the method is suitable for being applied to the production of steel grade composition range: c: less than or equal to 0.0015 percent; si: less than or equal to 0.02 percent; mn: less than or equal to 0.15 percent; p: less than or equal to 0.015 percent; s is less than or equal to 0.012 percent; al:0.025% -0.045%; the method specifically comprises the following steps:
the first slag changing of converter tapping: the steel is discharged in front of the furnace in a double slag blocking mode, a sliding plate blocks slag and a slag blocking cone, and the circular flow and non-diffusion state of a steel outlet is ensured, and the steel tapping time is required to be 4 min; simultaneously, when the molten steel reaches one third of the steel ladle amount, 2.0-2.8 kg/t of lime powder, 0.2-0.4 kg/t of quartz sand and 0.4-0.6 kg/t of fluorite balls are added; after tapping, according to different oxygen at the end point of the converter, 0.3-0.45 kg/t of aluminum particles are added into a ladle after the liquid level of the molten steel is calm, and the added aluminum particles are required to be uniformly spread on the surface of the molten steel;
in the method, the ladle bottom blowing is controlled by large flow at the stage of adding lime powder, quartz sand and fluorite successively during the tapping process, a single pipe is controlled at 700-900 Nl/min, the bottom blowing is adjusted to small flow control after the added modified material is melted, the single pipe is controlled at 150-250 Nl/min, the bottom blowing argon valve is closed after the tapping amount reaches 80 percent, the temperature is ensured to be 1610-1630 ℃ when the steel reaches an RH station, and the oxygen content of the molten steel is 400-600 ppm;
RH vacuum treatment adopts a deep decarburization mode to produce, an immersion pipe lifts argon gas and controls the argon gas at 130-150 Nl/min, the circulating flow of molten steel is increased, the bottom of a steel ladle is opened to blow argon gas during decarburization, the flow of the rising side of the corresponding immersion pipe is controlled at 50-100 Nl/min, molten steel circulation is promoted, the dead zone of the molten steel in the steel ladle is reduced, the oxygen temperature rise operation is less than or equal to 10 percent in the treatment process, the circulating time is longer than 3 minutes after deoxidation, the oxygen content of the molten steel is 350-450 ppm after decarburization is finished, aluminum particles are added for deoxidation alloying, and the carbon content of the molten steel is ensured to be less than 10ppm after the molten steel treatment is finished;
the specific operation steps of the secondary top slag modification are as follows: after RH treatment is finished, 0.2-0.3 kg/t of aluminum particles are uniformly added and uniformly spread on the surface of molten steel top slag to remove the residual oxygen of the top slag, the modified top slag contains more than or equal to 40 percent of CaO as the main target component and Al 2 O 3 ≤30％，T.Fe≤7％。
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