CN108620544B - Method for controlling drainage sand to enter tundish in continuous casting process - Google Patents
Method for controlling drainage sand to enter tundish in continuous casting process Download PDFInfo
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- CN108620544B CN108620544B CN201810564363.6A CN201810564363A CN108620544B CN 108620544 B CN108620544 B CN 108620544B CN 201810564363 A CN201810564363 A CN 201810564363A CN 108620544 B CN108620544 B CN 108620544B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
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Abstract
A method for controlling the flow guiding sand to enter a tundish in the continuous casting process belongs to the field of steel continuous casting; the method comprises the following steps: 1) before the pouring of the ladle in the previous furnace is finished, blowing inert gas into molten steel through a permeable nozzle block at the bottom of the ladle to an un-poured ladle with drainage sand positioned on a waiting position of a ladle turret; when the ladle rotates on the ladle turret to a position where the ladle pouring position forms an angle of 20-50 degrees with the ladle, the ladle stops rotating; 2): placing a waste steel groove below a ladle nozzle, continuously blowing gas from the beginning of blowing inert gas to the first stop of rotation, opening a sliding nozzle for the first time when the temperature of molten steel right above a gas-permeable nozzle pocket brick is increased by 2-5 ℃, and discharging drainage sand and a very small amount of molten steel; when all the drainage sand is discharged, closing the sliding water gap; 3) keeping blowing in inert gas, rapidly rotating the ladle to a pouring position, connecting a large ladle long nozzle, opening a sliding nozzle for the second time, and starting normal open pouring; and stopping blowing the inert gas after the ladle begins to be normally poured.
Description
Technical Field
The invention belongs to the field of steel continuous casting, and particularly relates to a method for controlling drainage sand to enter a tundish in a continuous casting process.
Background
In the continuous casting production process, ladle drainage sand is generally needed to be used for drainage, namely, the drainage sand is added into a ladle upper nozzle, and after a sliding plate of a sliding nozzle is opened, the drainage sand falls down due to the pressure of molten steel, and the molten steel automatically flows out along with the outflow of the drainage sand. After molten steel is automatically poured, the drainage sand can enter a tundish along with the molten steel, and because the drainage sand is large in size, if the drainage sand cannot be removed in time, the drainage sand reacts with the molten steel to form large inclusions in the steel, so that the molten steel is seriously polluted, and the quality of casting blanks and products is remarkably deteriorated.
At present, most steel enterprises do not take measures to the drainage sand in the casting process and allow the drainage sand to completely flow into the tundish, and a few steel enterprises manually receive partial drainage sand before the casting molten steel of the ladle does not flow out, so that the quantity of the drainage sand flowing into the tundish is partially reduced, but a considerable quantity of the drainage sand can enter the tundish, and the defects of poor operation controllability and high labor intensity of workers in ① and potential safety hazard in ② exist.
Chinese patent CN104690241A proposes a device for preventing drainage sand from entering into a tundish of a continuous casting machine, which comprises a nozzle opening control device, a drainage sand outlet, a long nozzle, and a drainage sand receiving device. This patent suffers from the following disadvantages: the equipment is complex, the cost is high, and the operation is complicated; specific operating parameters are not given, and the guiding significance to the field practical application is not great; the narrow space between the steel ladle and the tundish is not considered, and normal pouring production can be influenced by arranging devices such as a drainage sand receiving device and the like, so that the method is not suitable for field large-scale production application.
At present, no method capable of effectively and completely preventing the drainage sand from flowing into the tundish exists, and the pollution of the drainage sand flowing into the tundish to molten steel cannot be completely eliminated.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a method for controlling the flow guiding sand to enter a tundish in the continuous casting process. In combination with the actual field production, before the ladle is not rotated to the normal pouring position, inert gas is blown into the ladle through the ladle gas-permeable nozzle pocket brick, so that the internal stirring of molten steel is promoted, and the molten steel temperature in the area above the nozzle is improved; and then opening the sliding nozzle, draining the drainage sand, closing the sliding nozzle, rapidly rotating the ladle to a pouring position, and opening the sliding nozzle for the second time to start normal open pouring. The invention can completely avoid the drainage sand from entering the tundish to pollute the molten steel, thereby improving the quality of the molten steel and the casting blank.
The invention discloses a method for controlling drainage sand to enter a tundish in a continuous casting process, which specifically comprises the following steps:
step 1: blowing inert gas into molten steel through a permeable nozzle block at the bottom of the ladle to an un-cast ladle with drainage sand positioned on a waiting position of a ladle turret 5-10 minutes before the pouring of the ladle in the previous furnace is finished; when the ladle rotates on the ladle turret to a position where the ladle pouring position forms an angle of 20-50 degrees with the ladle, the ladle stops rotating; wherein: the pressure at which the inert gas is blown in is: 0.3 to 0.45MPa, and a flow rate of 5 to 25Nm3/h；
Step 2: placing a waste steel groove below a ladle nozzle, continuously blowing gas from the beginning of blowing inert gas to the first stop of rotation, so that the temperature of molten steel in a position 10cm above a gas-permeable nozzle brick cup is increased by 2-5 ℃, the temperature of the molten steel in the ladle is uniform, opening a sliding nozzle for the first time, and discharging drainage sand and a very small amount of molten steel; when all the drainage sand is discharged, the sliding water gap is closed immediately;
and step 3:
(1) keeping blowing in inert gas, rapidly rotating the ladle to a pouring position, connecting a large ladle long nozzle, opening a sliding nozzle for the second time, and starting normal open pouring;
(2) and stopping blowing the inert gas after the ladle begins to be normally poured.
The method for controlling the flow guide sand to enter the tundish in the continuous casting process comprises the following steps:
in the method, the inert gas is argon.
In the step 1, the rotation of the ladle on the ladle turret to the ladle pouring position angle means that: and the ladle rotates to the included angle between the central line of the ladle turret and the central line of the ladle turret when the ladle rotates to the pouring position.
In the step 1, inert gas is blown into molten steel to promote stirring and temperature homogenization of the molten steel and increase the temperature of the molten steel in the area above the air-permeable nozzle brick cup.
In the step 1 and the step 2, the time from the beginning of blowing the inert gas to the first opening of the sliding water gap to discharge the drainage sand is 2-5 min.
And 2, placing a scrap steel groove below the ladle sliding nozzle to receive all the drainage sand and a small amount of molten steel discharged when the sliding nozzle is opened for the first time.
The steel scrap groove in the step 2 refers to: and means, disposed below the ladle tap hole, for receiving the flow guiding sand and molten steel flowing out of the ladle tap hole.
And in the step 3, inert gas is continuously blown in, the temperature of the molten steel is increased and is uniform, so that the molten steel cannot be cooled and condensed when the sliding water gap is opened for the second time, and the molten steel can be poured normally.
In the step 3, the time from closing the sliding water gap to opening the sliding water gap for the second time is 20-60 s.
Compared with the prior art, the method for controlling the drainage sand to enter the tundish in the continuous casting process has the beneficial effects that: the continuous casting device can discharge the drainage sand before the ladle is not rotated to the normal casting position, fully considers the space of a continuous casting platform for on-site production, has simple equipment and simple and convenient operation, can effectively prevent the drainage sand from entering the tundish to pollute molten steel, improves the molten steel cleanliness in the tundish, ensures the quality of casting blanks, and effectively solves the technical problem that the quality of the casting blanks is influenced when the drainage sand enters the tundish in the prior art; argon is blown before the steel ladle is poured, so that molten steel stirring is promoted, the temperature of molten steel in the area above a water gap is increased, the molten steel is prevented from being cooled and condensed after meeting a sliding plate mechanism, the molten steel can smoothly flow out when the sliding water gap is opened for the second time, the production efficiency is improved, and automatic pouring is guaranteed; the invention can completely avoid the drainage sand from entering the tundish, thereby avoiding the molten steel pollution caused by the inflow of the drainage sand.
Drawings
FIG. 1 is a schematic diagram of blowing and draining operations before ladle pouring according to an embodiment of the present invention.
FIG. 2 is a schematic view of a ladle bottom blowing system according to an embodiment of the present invention.
In the figure, 1, a ladle turret; 2. a tundish; 3. a scrap steel trough; 4. a valve; 5. a flow meter; 6. a pressure gauge; 7. a ladle; 8. a gas-permeable nozzle pocket brick; 9. draining sand; 10. a sliding gate valve.
Detailed Description
The invention is further illustrated by the following examples and drawings, but is not limited thereto.
Example 1
A method for controlling the flow of guide sand into a tundish in a continuous casting process, as shown in figures 1 and 2, in this embodiment, a 60-ton ladle is used; the method specifically comprises the following steps:
step 1: blowing argon into molten steel in a ladle through a ladle bottom air-permeable nozzle pocket brick 8 when the ladle 7 with the drainage sand at the standby position of the ladle turret 1 is positioned 5 minutes before the pouring of the ladle in the previous furnace is finished; when the ladle 7 rotates on the ladle turret 1 to the steelWhen the angle of the ladle pouring position is 20 degrees, stopping rotating; wherein: the pressure of argon gas blowing was: 0.3MPa, flow 5Nm3/h；
Step 2: and continuously blowing argon to improve the temperature of the molten steel within 10cm above the air-permeable nozzle brick cup 8 by 2-5 ℃, so that the temperature of the molten steel in the ladle is uniform. Placing a scrap steel groove 3 below a sliding nozzle 10 of a ladle 7, opening the sliding nozzle 10 for the first time, receiving all discharged drainage sand 9 and a very small amount of molten steel, and closing the sliding nozzle 10 when all drainage sand 9 is discharged;
the time from beginning to blow argon gas to opening the sliding water gap 10 for the first time to discharge the drainage sand 9 is 2 min;
and step 3:
(1) keeping blowing argon, rapidly rotating the ladle 7 to a pouring position, connecting a large ladle long nozzle, opening the sliding nozzle 10 for the second time, and starting normal open pouring; wherein the time from closing the sliding gate valve 10 to secondarily opening the sliding gate valve 10 is 20 s;
(2) and stopping blowing the argon after the ladle 7 begins normal open pouring.
The process originally adopted in this embodiment is to discharge all the drainage sand into the tundish. By adopting the process parameters, the drainage sand is completely discharged into the waste steel tank, the invention can completely avoid the drainage sand from entering the tundish to pollute the molten steel, and greatly improve the quality of the molten steel and the casting blank.
Example 2
A method for controlling the flow of guide sand into a tundish in a continuous casting process, as shown in figures 1 and 2, in the embodiment, a 120-ton ladle is adopted; the method specifically comprises the following steps:
step 1: blowing argon into molten steel in a ladle through a ladle bottom air-permeable nozzle pocket brick 8 when the ladle 7 with the drainage sand at the standby position of the ladle turret 1 is positioned 6 minutes before the pouring of the ladle in the previous furnace is finished; when the ladle 7 rotates on the ladle turret 1 to a position where the ladle pouring position forms an angle of 30 degrees, the rotation is stopped; wherein: the pressure of argon gas blowing was: 0.4MPa, flow 15Nm3/h；
Step 2: and continuously blowing argon to improve the temperature of the molten steel within 10cm above the air-permeable nozzle brick cup 8 by 2-5 ℃, so that the temperature of the molten steel in the ladle is uniform. Placing a scrap steel groove 3 below a sliding nozzle 10 of a ladle 7, opening the sliding nozzle 10 for the first time, receiving all discharged drainage sand 9 and a very small amount of molten steel, and closing the sliding nozzle 10 when all drainage sand 9 is discharged;
the time from beginning to blow argon gas to opening the sliding water gap 10 for the first time to discharge the drainage sand 9 is 3 min;
and step 3:
(1) keeping blowing argon, rapidly rotating the ladle 7 to a pouring position, connecting a large ladle long nozzle, opening the sliding nozzle 10 for the second time, and starting normal open pouring; wherein the time from closing the sliding gate valve 10 to secondarily opening the sliding gate valve 10 is 40 s;
(2) and stopping blowing the argon after the ladle 7 begins normal open pouring.
The original process adopted in this example was the traditional manual sand-receiving process, but still 30% of the drainage sand entered the tundish. By adopting the process parameters, the drainage sand is completely discharged into the waste steel tank, the invention can completely avoid the drainage sand from entering the tundish to pollute the molten steel, and greatly improve the quality of the molten steel and the casting blank.
Example 3
A method for controlling the flow guide sand to enter a tundish in a continuous casting process, as shown in figures 1 and 2, in the embodiment, a 180-ton ladle is adopted; the method specifically comprises the following steps:
step 1: blowing argon into molten steel in a ladle through a ladle bottom air-permeable nozzle pocket brick 8 when the ladle 7 with the drainage sand at the standby position of the ladle turret 1 is positioned 10 minutes before the pouring of the ladle in the previous furnace is finished; when the ladle 7 rotates on the ladle turret 1 to an angle of 50 degrees with the ladle pouring position, the rotation is stopped; wherein: the pressure of argon gas blowing was: 0.45MPa, flow 25Nm3/h；
Step 2: and continuously blowing argon to improve the temperature of the molten steel within 10cm above the air-permeable nozzle brick cup 8 by 2-5 ℃, so that the temperature of the molten steel in the ladle is uniform. Placing a scrap steel groove 3 below a sliding nozzle 10 of a ladle 7, opening the sliding nozzle 10 for the first time, receiving all discharged drainage sand 9 and a small amount of molten steel, and closing the sliding nozzle 10 when all drainage sand 9 is discharged;
the time from beginning to blow argon gas to opening the sliding water gap 10 for the first time to discharge the drainage sand 9 is 5 min;
and step 3:
(1) keeping blowing argon, rapidly rotating the ladle 7 to a pouring position, connecting a large ladle long nozzle, opening the sliding nozzle 10 for the second time, and starting normal open pouring; wherein the time from closing the sliding gate valve 10 to secondarily opening the sliding gate valve 10 is 60 s;
(2) and stopping blowing the argon after the ladle 7 begins normal open pouring.
The original process adopted in this embodiment is the traditional manual sand receiving process, but 35% of the drainage sand enters the tundish. By adopting the process parameters, the drainage sand is completely discharged into the waste steel tank, the invention can completely avoid the drainage sand from entering the tundish to pollute the molten steel, and greatly improve the quality of the molten steel and the casting blank.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and are not limited. Although the present invention has been described in detail with reference to the embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (3)
1. A method for controlling drainage sand to enter a tundish in a continuous casting process is characterized by comprising the following steps:
step 1: blowing inert gas into molten steel through a permeable nozzle block at the bottom of the ladle to an un-cast ladle with drainage sand positioned on a waiting position of a ladle turret 5-10 minutes before the pouring of the ladle in the previous furnace is finished; when the ladle rotates on the ladle turret to a position where the ladle pouring position forms an angle of 20-50 degrees with the ladle, the ladle stops rotating; wherein: the pressure at which the inert gas is blown in is: 0.3 to 0.45MPa, and a flow rate of 5 to 25Nm3H; the inert gas is argon;
step 2: placing a waste steel groove below a ladle nozzle, continuously blowing gas from beginning to blow inert gas to stopping rotation for the first time, so that the temperature of molten steel in a position 10cm above a gas-permeable nozzle brick cup is increased by 2-5 ℃, the temperature of the molten steel in the ladle is uniform, opening a sliding nozzle for the first time, and discharging drainage sand and a small amount of molten steel into the waste steel groove placed below the ladle sliding nozzle; when all the drainage sand is discharged, the sliding water gap is closed immediately;
and step 3:
(1) keeping blowing in inert gas, rapidly rotating the ladle to a pouring position, connecting a large ladle long nozzle, opening a sliding nozzle for the second time, and starting normal open pouring;
(2) and stopping blowing the inert gas after the ladle begins to be normally poured.
2. The method for controlling the flow guide sand to enter the tundish in the continuous casting process according to claim 1, wherein in the step 1 and the step 2, the time from the beginning of the inert gas blowing to the first opening of the sliding gate valve to the drainage sand discharging is 2-5 min.
3. The method for controlling the flow guide sand to enter the tundish in the continuous casting process according to claim 1, wherein in the step 3, the time from closing the sliding gate valve to secondarily opening the sliding gate valve is 20-60 s.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810564363.6A CN108620544B (en) | 2018-06-04 | 2018-06-04 | Method for controlling drainage sand to enter tundish in continuous casting process |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810564363.6A CN108620544B (en) | 2018-06-04 | 2018-06-04 | Method for controlling drainage sand to enter tundish in continuous casting process |
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| CN108620544A CN108620544A (en) | 2018-10-09 |
| CN108620544B true CN108620544B (en) | 2020-03-31 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US3822735A (en) * | 1969-07-11 | 1974-07-09 | Nat Steel Corp | Process for casting molten silicon-aluminum killed steel continuously |
| JP2891270B2 (en) * | 1991-10-21 | 1999-05-17 | 株式会社神戸製鋼所 | Spontaneous opening method of water pool in tundish |
| CN2609688Y (en) * | 2003-03-14 | 2004-04-07 | 唐山钢铁股份有限公司 | Continuous casting tundish water gap |
| CN1640579A (en) * | 2004-01-14 | 2005-07-20 | 首钢总公司 | Low temperature decrease steel ladle pouring method |
| CN101143384A (en) * | 2007-11-02 | 2008-03-19 | 中信重型机械公司 | Large scale casting sliding plate blowing Ar drainage casting technology |
| CN104690241A (en) * | 2014-10-27 | 2015-06-10 | 上海修悟机械设备有限公司 | Device for preventing flow guiding sand from entering tundish of continuous casting machine |
| CN105033236B (en) * | 2015-08-25 | 2017-11-28 | 首钢京唐钢铁联合有限责任公司 | The outer arranging device of stuffing sand and Con casting ladle method for pouring |
| CN106623887A (en) * | 2016-11-21 | 2017-05-10 | 张家港联峰钢铁研究所有限公司 | Ladle filler sand discharging device and continuous casting ladle casting method |
| CN106978519A (en) * | 2017-04-21 | 2017-07-25 | 东北大学 | A kind of method that blowing argon gas prevent whirlpool slag in ladle tapping process |
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