KR101225137B1 - Slag cooling device and slag cooling method thereof - Google Patents

Slag cooling device and slag cooling method thereof Download PDF

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Publication number
KR101225137B1
KR101225137B1 KR1020110029616A KR20110029616A KR101225137B1 KR 101225137 B1 KR101225137 B1 KR 101225137B1 KR 1020110029616 A KR1020110029616 A KR 1020110029616A KR 20110029616 A KR20110029616 A KR 20110029616A KR 101225137 B1 KR101225137 B1 KR 101225137B1
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South Korea
Prior art keywords
slag
molten slag
molten
fan
cooling
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KR1020110029616A
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Korean (ko)
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KR20120111229A (en
Inventor
서홍규
이종민
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현대제철 주식회사
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Priority to KR1020110029616A priority Critical patent/KR101225137B1/en
Publication of KR20120111229A publication Critical patent/KR20120111229A/en
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B2400/00—Treatment of slags originating from iron or steel processes
    • C21B2400/02—Physical or chemical treatment of slags
    • C21B2400/022—Methods of cooling or quenching molten slag
    • C21B2400/024—Methods of cooling or quenching molten slag with the direct use of steam or liquid coolants, e.g. water
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B2400/00—Treatment of slags originating from iron or steel processes
    • C21B2400/04—Specific shape of slag after cooling
    • C21B2400/044—Briquettes or moulded bodies other than sheets
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B2400/00—Treatment of slags originating from iron or steel processes
    • C21B2400/05—Apparatus features
    • C21B2400/066—Receptacle features where the slag is treated
    • C21B2400/072—Tanks to collect the slag, e.g. water tank

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  • Engineering & Computer Science (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Furnace Details (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)

Abstract

A slag cooling device and a slag cooling method thereof are disclosed. Slag cooling apparatus according to an embodiment of the present invention, the slag fan having a receiving portion open to one side to receive the molten slag; Shafts extending from both ends of the slag fan, respectively; A support rotatably coupled to the shaft to pivot the slag fan, the support supporting the shaft; And a driving unit connected to the shaft to rotate the slag fan.

Description

Slag cooling device and slag cooling method {SLAG COOLING DEVICE AND SLAG COOLING METHOD THEREOF}

The present invention relates to a slag cooling device and a slag cooling method, and more particularly, to a slag cooling device and a slag cooling method for quenching the slag in the molten state generated in the blast furnace.

Blast furnace slag can be classified into slow cooling slag and reclaimed slag.

Slow cooling slag is also called lump ash slag. It is a lumped form in which hot liquid slag discharged from the blast furnace is slowly cooled by air in the air in a slag dry pit, or sprayed appropriately and cooled. Say.

Reclaimed slag is a blast furnace slag in a molten state that is rapidly cooled using a large amount of water, and hardly forms crystalline particles.

Such slag has a chemical composition similar to that of cement and is thus used as a raw material for blast furnace slag cement due to its fine grinding.

An embodiment of the present invention is to provide a slag cooling device and a slag cooling method that can shorten the cooling time of the molten slag and facilitate the crushing of the cooled slag.

According to one aspect of the invention, the slag fan having a receiving portion open to one side to receive the molten slag; Shafts extending from both ends of the slag fan, respectively; A support rotatably coupled to the shaft to pivot the slag fan and supporting the shaft; And a drive unit connected to the shaft to rotate the slag fan.

The bottom surface of the receiving portion, the molten slag outlet can be formed to penetrate up and down so that the molten slag passes.

An inclined surface downward toward the center of the molten slag may be formed on the bottom surface of the accommodation portion such that the molten slag is discharged through the molten slag outlet.

The slag cooling device may further include a cooling water tank disposed below the slag fan and configured to receive and quench the molten slag discharged through the molten slag outlet.

The slag cooling device may further include an injector disposed above the slag fan and injecting cooling water into the accommodation part to remove residual slag remaining in the accommodation part of the slag fan.

The drive unit, and a motor for providing a rotational force to the shaft; It may include a control unit for controlling the operation of the motor.

According to an aspect of the invention, providing a molten slag generated in the blast furnace; Pouring the molten slag into a slag pan having a plurality of molten slag outlets formed on a bottom surface thereof; Primary cooling the molten slag falling down through the molten slag outlet with air; And secondary cooling the molten slag primarily cooled by the air with the cooling water of the cooling water tank disposed below the slag fan.

The molten slag falling down through the molten slag outlet may be divided into a plurality of cylindrical units corresponding to the cross-sectional shape of the molten slag outlet.

The slag cooling method may include: cooling the residual slag by spraying cooling water on the slag pan to remove residual slag of the molten slag remaining in the slag pan; And rotating the slag fan to drop the residual slag of the slag fan downward.

According to the embodiment of the present invention, by increasing the surface area per unit volume of the molten slag, it is possible to shorten the cooling time of the molten slag, it is possible to facilitate the fracture of the cooled slag.

1 is a perspective view showing a slag cooling apparatus according to an embodiment of the present invention.
2 is a cross-sectional view of the slag fan of the slag cooling apparatus according to an embodiment of the present invention based on the line AA 'of FIG.
3 to 5 is a flow chart showing the operation of the slag cooling apparatus according to an embodiment of the present invention.
6 is a flow chart showing a slag cooling method according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated in the drawings and described in detail in the detailed description. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

Hereinafter, an embodiment of a slag cooling apparatus and a slag cooling method according to the present invention will be described in detail with reference to the accompanying drawings, in the description with reference to the accompanying drawings, the same or corresponding components are given the same reference numerals. And duplicate description thereof will be omitted.

1 is a perspective view showing a slag cooling apparatus according to an embodiment of the present invention, Figure 2 is a slag fan of the slag cooling apparatus according to an embodiment of the present invention based on the line AA 'of FIG. It is a cross section. 3 to 6 is a flow chart showing the operation of the slag cooling apparatus according to an embodiment of the present invention.

As shown in Figure 1, the slag cooling apparatus 100 according to an embodiment of the present invention, as a device for rapidly cooling the molten slag of the liquid generated in the blast furnace, slag pan (slag pan 10), shaft and a shaft 20, a support 30, and a driver 40.

First, referring to FIG. 1, the slag pan 10 is a member in the form of a container that can contain contents, and receives the molten slag of the liquid that has been carried by the slag pot 1 shown in FIG. 3. One side may have an open receiving portion (12).

As shown in FIG. 1, the shape of the slag fan 10 having the receiving part 12 may be formed in a rectangular box shape, and may be implemented in various shapes such as a cylindrical shape, although not shown.

The slag fan 10 may be made of alloy steel to withstand high temperature molten slag, and the receiving portion 12 of the slag fan 10 may be coated with a heat resistant material such as a fire brick, for example. .

As shown in FIG. 2, the molten slab penetrates the bottom surface of the accommodating part 12 to the bottom surface of the accommodating part 12 of the slag pan 10 so that molten slag poured into the accommodating part 12 passes therethrough. Slag outlet 14 may be formed.

The molten slag outlet 14 may be formed in the bottom surface of the receiving portion 12 so that the molten slag poured into the receiving portion 12 can be quickly discharged to the cooling water tank 50 to be described later.

The diameter (or diameter) of the molten slag outlet 14 may be variously determined according to the design condition of the user. As shown in FIG. 1, the cross-sectional shape of the molten slag outlet 14 may be formed in a circular shape, and may have various cross-sectional shapes such as polygons to increase the surface area of the molten slag although not shown.

As such, by forming a plurality of molten slag outlets 14 on the bottom surface of the receiving part 12 of the slag pan 10, as shown in FIG. 3, the molten molten slag of the liquid poured into the receiving part 12, As shown in FIG. 4, it is divided into a small columnar unit 70 and free-falls into the cooling water tank 50 as shown in FIG. 5.

In this case, as can be seen in Figures 3 to 5, the surface area of the molten slag that can be in contact with air or cooling water per unit volume is increased.

That is, a predetermined volume of molten slag poured into the receiving portion 12 is split into a plurality of small columnar units 70 by a slag fan 10 provided with a plurality of molten slag outlets 14, thereby providing air and The contact surface of the molten slag which can come into contact with the cooling water is greatly increased, thereby accelerating the cooling rate of the molten slag.

The molten slag divided into a plurality of small columnar units 70 is rapidly cooled in contact with the cooling water of the cooling water tank 50 to deform into an amorphous mass of glassy granules. At this time, the cooling time of the molten slag can be shortened due to the increased surface area.

The quenched columnar unit 70 has a low specific gravity and a low density per unit volume due to solidification before the crystal structure is homogenized, and thus can be more easily broken with less energy when pulverized in a subsequent crushing process.

In addition, through the process of rapidly cooling the molten slag in the molten state with air and water at high speed, chemical weathering of the slag, which is an environmental pollutant that forms calcium hydroxide (Ca (OH) 2), which is an alkali compound, is formed by reaction with water. The content of induced calcium oxide (CaO, or F-CaO) can be reduced or eliminated at all.

That is, in the process of dropping the molten slag divided into a plurality of small columnar unit 70 into the cooling water tank 50 can be brought into contact with the air in the atmosphere and by quenching with the cooling water of the cooling water tank 50, calcium oxide (CaO) There is no need for a separate aging process to reduce the content of c).

Through this, it is possible to shorten the post-treatment process, such as aging process, shredding process.

On the other hand, as shown in Figure 2, the molten slag outlet to the bottom surface of the receiving portion 12 so that the molten slag poured in the receiving portion 12 can be quickly discharged down through the molten slag outlet (14) An inclined surface 16 downward toward the center of the 14 may be formed.

That is, as can be seen in the cross section of the slag fan 10 shown in FIG. 2, downward toward the center of the molten slag outlet 14 near the vertices (or vertices) formed between the adjacent molten slag outlets 14. An inclined surface 16 may be formed to be inclined.

In this way, by placing the inclined surface 16 on the bottom surface of the receiving portion 12, it is possible to discharge the molten slag of the liquid down more quickly, and adhere to the surface of the receiving portion 12 of the slag pan 10 to be fixed It is possible to minimize the generation of residual residual slag.

As shown in FIG. 1, the shaft 20 is a rod-shaped shaft, and may extend from both ends of the slag fan 10.

As such, by providing the shafts 20 at both ends of the slag fan 10, the rotational force of the driving unit 40 to be described later is transmitted to the slag fan 10 through the shaft 20 to rotate the slag fan 10. Can be.

The support 30 is a device for supporting the slag fan 10 through the shaft 20, and is rotatably coupled to the shaft 20 so that the slag fan 10 can rotate with respect to the support 30.

In this embodiment, the shaft 20 and the support 30 are rotatably coupled to each other so that the slag fan 10 can rotate 180 degrees with respect to the support 30, for example.

That is, the molten slag poured into the receiving portion 12 is discharged to the cooling water tank 50 through the molten slag outlet 14, and then rotates the slag pan 10 with respect to the support 30, for example by 180 degrees. The residual slag of the molten slag that may remain in the receiving portion 12 can be separated from the receiving portion 12.

This will be described in more detail in the injector 60 to be described later.

The driving unit 40 is connected to the shaft 20 and serves to rotate the slag fan 10. As shown in FIG. 1, the driving unit 40 may be fixedly coupled to the support 30.

In detail, the driving unit 40 may include a motor 42 providing a rotational force to the shaft 20 and a controller 44 controlling the operation of the motor 42.

In this case, the motor 42 may be electrically connected to the controller 44 and driven according to a control signal input from the controller 44.

The controller 44 may include a plurality of input / output units to be electrically connected to an external device, and control the motor 42 to rotate the slag fan 10 according to a signal input by a user or a computer. Do it.

Meanwhile, the slag cooling device 100 according to the present embodiment may further include a cooling water tank 50 as shown in FIG. 1.

The cooling water tank 50 is disposed below the slag fan 10 and serves to quench the molten slag discharged through the molten slag outlet 14 of the slag fan 10.

To this end, a space portion containing the cooling water is formed inside the cooling water tank 50.

Meanwhile, the slag cooling device 100 according to the present embodiment may further include an injection device 60 as shown in FIGS. 1 and 2.

The injector 60 is disposed above the slag fan 10 to inject cooling water into the accommodating part 12 to remove residual slag remaining in the accommodating part 12 of the slag fan 10. Device.

That is, even after the molten slag poured into the receiving part 12 is discharged to the cooling water tank 50 through the molten slag outlet 14, in order to remove the remaining slag that may be stuck in the receiving part 12 and remain. The residual slag can be separated from the receiving portion 12 by quenching the residual slag by spraying cooling water at a high pressure through the plurality of nozzles 62.

As described above, according to the embodiment of the present invention, by increasing the surface area per unit volume of the molten slag, the cooling time of the molten slag can be shortened, and the crushing of the cooled slag can be facilitated.

In addition, the aging treatment step can be omitted, and the post-treatment step can be shortened.

The slag cooling apparatus 100 according to an aspect of the present invention has been described above. Hereinafter, the slag cooling method according to another aspect of the present invention will be described using the slag cooling apparatus 100.

6 is a flowchart illustrating a slag cooling method according to an embodiment of the present invention.

As shown in Figure 6, the slag cooling method according to the present embodiment, providing a molten slag generated in the blast furnace (S100); Pouring the molten slag into a slag fan 10 having a plurality of molten slag outlets 14 formed on a bottom surface thereof (S200); Primary cooling the molten slag falling down through the molten slag outlet (14) with air (S300); And cooling the molten slag primarily cooled by the air with the cooling water of the cooling water tank 50 disposed below the slag fan 10 (S400).

For better understanding of the description, the cooling method according to the present embodiment will be described with reference to FIGS. 3 to 5 as follows.

First, the molten slag generated in the blast furnace is transported to the slag cooling station (S100).

That is, a process of transporting the molten slag of the liquid phase generated in the blast furnace to the slag cooling station using the slag port (1) or the like is necessary.

Next, as shown in FIG. 3, the molten slag of the liquid conveyed by the slag port 1 or the like is poured into the slag pan 10 having a plurality of molten slag outlets 14 formed on the bottom surface (S200).

Next, as shown in FIG. 4, the molten slag of the liquid falling down through the molten slag outlet 14 formed in plural on the bottom surface of the slag fan 10 is first cooled by air (S300).

At this time, the molten slag falling down through the plurality of molten slag outlet 14 is divided into a plurality of columnar unit 70 corresponding to the cross-sectional shape of the molten slag outlet 14.

That is, the molten slag of the liquid phase poured into the receiving portion 12 of the slag pan 10 is divided into a small columnar unit 70 as shown in Figure 4, as shown in Figure 5, the cooling water tank Free fall to (50).

In this case, as described in the above embodiment, the surface area of the molten slag that can come into contact with air or cooling water per unit volume is increased.

In other words, a predetermined volume of molten slag poured into the receiving portion 12 is split into a plurality of small columnar units 70 by a slag pan 10 provided with a plurality of molten slag outlets 14. And the contact surface of the molten slag that can be in contact with the cooling water is greatly increased to accelerate the cooling rate of the molten slag.

In this step (S300), the columnar unit 70 is first cooled by air in the process of free fall.

Next, as shown in FIG. 5, the molten slag primarily cooled by air, that is, the columnar unit 70, is secondarily cooled by the cooling water of the cooling water tank 50 disposed below the slag fan 10. (S400).

The molten slag divided into a plurality of small columnar units 70 is rapidly cooled while being in contact with the cooling water of the cooling water tank 50 to deform into an amorphous glassy granule. At this time, the cooling time of the molten slag can be shortened due to the increased surface area.

The quenched columnar unit 70 has a low specific gravity and a low density per unit volume due to solidification before the crystal structure is homogenized, and thus can be more easily broken with less energy when pulverized in a subsequent crushing process.

In addition, through the process of rapidly cooling the molten slag in the molten state with air and water at high speed, chemical weathering of the slag, which is an environmental pollutant that forms calcium hydroxide (Ca (OH) 2), which is an alkali compound, is formed by reaction with water. The content of induced calcium oxide (CaO, or F-CaO) can be reduced or eliminated at all.

That is, in the process of dropping the molten slag divided into a plurality of small columnar unit 70 into the cooling water tank 50 can be brought into contact with the air in the atmosphere and by quenching with the cooling water of the cooling water tank 50, calcium oxide (CaO) There is no need for a separate aging process to reduce the content of c).

Through this, it is possible to shorten the post-treatment process, such as aging process, shredding process.

On the other hand, the slag cooling method according to this embodiment, the step of cooling the residual slag by spraying a coolant to the slag fan 10 to remove the residual slag of the molten slag remaining in the slag fan 10 (S500). ); And rotating the slag fan 10 to drop the residual slag of the slag fan 10 down (S600).

In the step S500 of cooling the residual slag, in order to separate the residual slag of the molten slag remaining in the receiving part 12 from the receiving part 12, coolant may be injected into the slag fan 10.

That is, the residual slag can be separated from the accommodating part 12 by quenching the residual slag by spraying cooling water at a high pressure.

In the step of dropping the residual slag down (S600), by rotating the slag fan 10 with respect to the support 30, for example, 180 degrees, to cool down the residual slag separated from the slag fan 10 to fall down. Can be.

As described above, according to the embodiment of the present invention, by increasing the surface area per unit volume of the molten slag, the cooling time of the molten slag can be shortened, and the crushing of the cooled slag can be facilitated.

In addition, the aging treatment step can be omitted, and the post-treatment step can be shortened.

Although the above has been described with reference to embodiments of the present invention, those skilled in the art may variously modify the present invention without departing from the spirit and scope of the present invention as set forth in the claims below. And can be changed.

100: slag chiller 10: slag fan
12: receiving portion 14: molten slag outlet
20: shaft 30: support
40: drive unit 42: motor
44: control unit 50: cooling water tank
60: injector 62: nozzle
70: columnar unit

Claims (9)

A slag fan having a receiving part open at one side to receive the molten slag;
Shafts extending from both ends of the slag fan, respectively;
A support rotatably coupled to the shaft to pivot the slag fan, the support supporting the shaft;
A drive unit connected to the shaft to rotate the slag fan; And
And an injector disposed above the slag fan and injecting cooling water into the accommodating part to remove residual slag remaining in the accommodating part of the slag fan.
The method of claim 1,
On the bottom surface of the receiving portion,
The slag cooling device characterized in that the molten slag outlet is formed to pass through the molten slag vertically.
The method of claim 2,
On the bottom surface of the receiving portion,
And a slanted surface downward toward the center of the molten slag so that the molten slag is discharged through the molten slag outlet.
The method according to claim 2 or 3,
And a cooling water tank disposed below the slag pan and configured to receive and quench the molten slag discharged through the molten slag outlet.
delete The method of claim 1,
The driving unit includes:
A motor for providing rotational force to the shaft;
Slag cooling apparatus comprising a control unit for controlling the operation of the motor.
Providing a molten slag generated in the blast furnace;
Pouring the molten slag into a slag pan having a plurality of molten slag outlets formed on a bottom surface thereof;
Primary cooling the molten slag falling down through the molten slag outlet with air;
Secondary cooling the molten slag primarily cooled by the air with cooling water in a cooling water tank disposed below the slag fan;
Cooling the residual slag by spraying cooling water on the slag pan to remove residual slag of the molten slag remaining in the slag pan; And
Rotating the slag fan to drop the residual slag of the slag fan down.
The method of claim 7, wherein
The molten slag falling down through a plurality of molten slag outlet,
Slag cooling method characterized in that divided into a plurality of cylindrical units corresponding to the cross-sectional shape of the molten slag outlet.
delete
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5373493A (en) * 1976-12-13 1978-06-29 Nippon Steel Corp Method and apparatus for supplying molten slag
JPS5384893A (en) 1976-12-30 1978-07-26 Kawasaki Heavy Ind Ltd Apparatus for recovering heat from metallurgical molten slag
KR960007487Y1 (en) * 1994-06-30 1996-08-29 포항종합제철 주식회사 Pellet device of converter slag
JP2003207281A (en) 2002-01-18 2003-07-25 Jfe Steel Kk Operating method of continuous solidification device of slag

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5373493A (en) * 1976-12-13 1978-06-29 Nippon Steel Corp Method and apparatus for supplying molten slag
JPS5384893A (en) 1976-12-30 1978-07-26 Kawasaki Heavy Ind Ltd Apparatus for recovering heat from metallurgical molten slag
KR960007487Y1 (en) * 1994-06-30 1996-08-29 포항종합제철 주식회사 Pellet device of converter slag
JP2003207281A (en) 2002-01-18 2003-07-25 Jfe Steel Kk Operating method of continuous solidification device of slag

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