KR101646947B1 - Injecting system of desulfurizing agent for molten iron - Google Patents

Injecting system of desulfurizing agent for molten iron Download PDF

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Publication number
KR101646947B1
KR101646947B1 KR1020150181645A KR20150181645A KR101646947B1 KR 101646947 B1 KR101646947 B1 KR 101646947B1 KR 1020150181645 A KR1020150181645 A KR 1020150181645A KR 20150181645 A KR20150181645 A KR 20150181645A KR 101646947 B1 KR101646947 B1 KR 101646947B1
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KR
South Korea
Prior art keywords
desulfurizing agent
impeller
molten iron
nitrogen
desulfurizer
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KR1020150181645A
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Korean (ko)
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김호천
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포스마텍 주식회사
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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
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • 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
    • C21C1/00—Refining of pig-iron; Cast iron
    • C21C1/02—Dephosphorising or desulfurising
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/30—Regulating or controlling the blowing
    • C21C5/32—Blowing from above
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0075—Treating in a ladle furnace, e.g. up-/reheating of molten steel within the ladle
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/064—Dephosphorising; Desulfurising
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/072—Treatment with gases

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)

Abstract

The present invention relates to an injection system of a desulfurizing agent for molten iron which improves desulfurizing efficiency by strongly spraying and injecting a desulfurizing agent inserted into molten iron to remove sulfur within the molten iron with high pressure nitrogen. The injection system of the desulfurizing agent for molten iron comprises: an impeller operator installed in an upper portion of a molten iron ladle; an impeller connected to the impeller operator; a lifting type desulfurizing device integrally installed in the impeller operator, and injecting a desulfurizing agent into molten iron of the molten iron ladle; and a nitrogen spray device connected to the lifting type desulfurizing device to spray high pressure nitrogen for the desulfurizing agent to strongly be injected into the molten iron.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a molten iron desulfurization system,

The present invention relates to a molten iron desulfurizing agent blowing system, and more particularly, to a molten iron desulfurizing agent blowing system capable of increasing the desulfurization efficiency by strongly blowing a desulfurizing agent injected into molten iron to remove sulfur in the molten iron, .

The steelmaking operation consists of preheating the molten iron from the blast furnace, charging it into the converter, passing the furnace refining and secondary refining process, and then producing the casting through the continuous casting process.

Here, the preliminary treatment of the molten iron is a process of treating the molten iron discharged from the blast furnace before supplying the molten iron to the converter, which is the fifth impurity contained in the molten iron, such as carbon (C), silicon (Si), manganese (Mn) (S), mainly phosphorus and sulfur.

In particular, sulfur (S), when present in large quantities in steel, causes cracks, decreases brittleness and adversely affects steel properties such as red shortness. Therefore, sulfur It should be kept as low as possible except for steel grades.

In general, the desulfurization treatment is carried out in a molten state because when the amount of carbon (C), silicon (Si) and manganese (Mn) is large, the activity coefficient of sulfur (S) And about 5 times of desulfurizing agent should be used to obtain the same desulfurizing effect in the molten steel state.

Generally, in steelworks, desulfurization treatment is carried out by transferring from torpedo ladle car or open ladle car, which is a transport container, to charter ladle for efficient process flow. Desulfurization treatment is performed by mechanical stirring method Mechanical Stirring Method and Gas Injection Method.

In recent years, with the increase in production of low-sulfur steel, efficient desulfurization treatment in the chartering stage has become essential. Conventionally, a method of using a solid desulfurizing agent such as lime (CaO) is generally used for desulfurizing the molten iron. For example, a CaO based desulfurization agent is blown into a charcoal vessel contained in a charcoal vessel such as a torpedo car or a hot metal ladle using a blowing injection lance (Top addition / addition from top) while immersing a molten iron in a molten iron transfer vessel by immersing a stirring blade (also referred to as an impeller) into the molten iron in the molten iron transfer vessel, stirring the molten iron with a rotating stirring blade, A mechanical agitation type desulfurization method has been carried out.

In the desulfurization reaction using the lime-based desulfurization agent, it is effective to increase the reaction interfacial area to increase the efficiency of the desulfurization reaction. Therefore, when the size of the added desulfurizer is finely granulated, do.

1 is a front view showing a conventional molten iron desulfurization apparatus.

1, an impeller 20 is installed in a molten iron 11 of a char iron carrier container 10 and is connected to a hopper 310 for supplying a desulfurizing agent from a desulfurizer supply tank 30, 10, an inlet 40 for introducing a desulfurizing agent into the hot wire 11 is installed obliquely.

As described above, in the mechanical stirring type desulfurization method in a practical machine, the desulfurizing agent is supplied from the hopper 31 and the desulfurizing agent is treated from the inlet 40 provided above the hot metal carrier vessel 10 such as the hot ladle It is a common practice to add the ingredients in a container.

When the fine desulfurizing agent is added in this manner, the desorbing agent that flares up and the desulfurizing agent that flies up to the ascending air flow are increased because the inlet 40 is provided obliquely above the charcoal carrier container 10, and the addition yield of the desulfurizing agent is decreased As a result, there has been a problem that efficient desulfurization treatment can not be achieved.

Korean Patent Publication No. 10-0749022

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above problems, and it is an object of the present invention to provide an elevator type desulfurization device capable of raising and lowering an impeller operating device installed on an upper portion of a hot- It is possible to maximize the addition yield of the desulfurizing agent by minimizing scattering of the desulfurizing agent by injecting high-pressure nitrogen when the desulfurizing agent is sprayed, thereby allowing the desulfurizing agent mixed with nitrogen to be strongly injected into the molten iron.

According to an aspect of the present invention, there is provided a molten iron desulfurizer blowing system comprising: an impeller operating device installed on an upper portion of a hot metal ladle; an impeller connected to the impeller operating device; And a nitrogen injection device connected to the elevating type desulfurization device and injecting nitrogen at a high pressure so that the desulfurizing agent can be strongly injected into the molten iron, .

The impeller actuating device may include a frame on which the impeller can be installed, and an operation part connected to the impeller inside the frame to operate the impeller.

The operation unit may include a driving motor connected to the inner side of the frame by an impeller and a driving shaft to rotate the driving shaft to rotate the impeller, and a speed reducer provided on the driving shaft to reduce the speed of the driving motor.

A ball bearing may be installed outside the drive shaft to rotate the impeller smoothly by driving the drive motor.

The elevating type desulfurization device includes a desulfurizing agent inlet lance installed inside the impeller operating device to allow the desulfurizing agent to be introduced into the hot metal leasing line, an up-down bar welded to the desulfurizing agent inlet lance to raise and lower the desulfurizer inlet lance, And an ascending and descending portion connected to the inner upper portion of the impeller actuating device to move up and down the bar.

A plurality of guide rollers may be installed on both outer sides of the raising and lowering bar so that the raising and lowering bar can smoothly move up and down according to the operation of the raising and lowering portion.

The desulfurizer charging lance may be connected to the desulfurizer supply device and the end portion may be vertically installed inside the charging ladle.

The ascending and descending portion may include a connecting port for connecting the ascending and descending bar and an ascending and descending cylinder connected to the connecting port for operating the ascending and descending bar up and down.

The desulfurizer feeder comprises a desulfurizer feed tank, a feed conveyor connected to the desulfurizer feed tank to feed the desulfurizer, and a desulfurizer feeder disposed below the end of the feed conveyor and fed through the feed conveyor to the desulfurizer feed lance And a desulfurizer feed hopper.

The desulfurizing agent supply tank may be divided into a main supply tank and an auxiliary supply tank. A rotary valve may be installed at each of the main supply tank and the auxiliary supply tank so as to control the desulfurizing agent supplied to the transfer conveyor.

The nitrogen injection device may include a nitrogen injection hose connected to the desulfurizing agent inlet lance of the elevated desulfurizer and a nitrogen supplier for supplying high pressure nitrogen with the nitrogen injection hose.

An auxiliary nitrogen tank may be installed between the nitrogen inlet hose and the nitrogen feed.

As described above, according to the molten iron desulfurizing agent blowing system of the present invention, the elevating type desulfurizing device for blowing the desulfurizing agent into the impeller operating device provided with the impeller is vertically installed, and the high-pressure nitrogen The desulfurizing agent containing nitrogen at a high pressure is strongly blown into the molten iron through the desulfurizing agent lance to maximize the addition rate of the desulfurizing agent into the molten iron, thereby maximizing the working efficiency.

1 is a front view showing a conventional molten iron desulfurization apparatus.
2 is a front view showing a molten iron desulfurizer blowing system according to the present invention.
3 is a front view showing a state in which the elevating type desulfurization apparatus of the molten iron desulfurization system blowing system according to the present invention is lowered.
4 is a side view showing a molten iron desulfurizer blowing system according to the present invention.
5 is a front view showing the desulfurizing agent supply device and the nitrogen supply device of the molten iron desulfurization agent blowing system according to the present invention.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a front view showing a molten iron desulfurizing agent blowing system according to the present invention, FIG. 3 is a front view showing a state where the elevating type desulfurizing apparatus of the molten iron desulfurizing agent blowing system according to the present invention is lowered, FIG. FIG. 5 is a front view showing a desulfurizer feeder and a nitrogen feeder of the molten iron desulfurizer blowing system according to the present invention. FIG.

2 to 5, a molten iron desulfurizer blowing system according to the present invention includes an impeller operating device 200, an impeller 300, an elevated desulfurization device 400, a nitrogen injection device 500, .

The impeller actuating device 200 is installed on the charger ladle 100 to operate the impeller 300 for stirring the charcoal 110.

The impeller actuating device 200 includes a frame 210 installed on the charger ladle 100 to allow the impeller 300 to be installed therein and an impeller 300 connected to the inside of the frame 210, And an actuating part 220 for operating the impeller 300 for operating the impeller 300.

The frame 210 is installed on the upper portion of the charter ladle 100 while having a predetermined mold.

The operation unit 220 includes a drive motor 221 connected to the upper portion of the frame 210 via an impeller 300 and a drive shaft 222 and a speed reducer 223).

The driving motor 221 is connected to the impeller 300 and the driving shaft 222 to rotate the driving shaft 222 while being driven to operate the impeller 300.

At this time, the driving motor 221 is composed of a forward and reverse motors so as to rotate the impeller 300 left and right.

The speed reducer 223 is installed in the driving motor 221 to adjust the rotational speed of the impeller 300 by reducing the speed of the driving motor 221 for smooth operation of the charcoal line 110.

A ball bearing 224 is installed outside the drive shaft 222 to rotate the drive shaft 222 smoothly for smooth rotation of the impeller 300 by driving the drive motor 221, .

The impeller 300 is installed in the charger 110 of the charger ladle 100 while being installed at the lower portion of the operating part 220 of the impeller operating device 200.

A cover 120 is installed on the upper portion of the heating ladle 100 to prevent operation of the impeller 300 and leakage of the desulfurizing agent blown from the elevating and desorbing apparatus 400 and leaking of molten iron .

The elevating type desulfurization device 400 is installed integrally with the impeller operating device 200 to blow the desulfurizing agent into the molten iron 110 of the hot ladle 100 for desulfurization treatment.

As shown in FIGS. 2 to 4, the elevated desulfurization apparatus 400 includes a desulfurizer charging lance 410, a lifting bar 420, and a lifting and descending unit 430.

The desulfurizing agent inlet lance 410 is installed inside the impeller operating device 200 to desulfurize the molten iron 100 into the molten iron 110 to be desulfurized.

The desulfurizing agent inlet lance 410 is connected to the desulfurizer feeder 600 so that the desulfurizer can be blown into the molten iron 110 of the hot ladle 100 while being connected to the nitrogen injector 500 When the desulfurizing agent is supplied to the desulfurizing agent inlet lance 410, high pressure nitrogen is supplied from the nitrogen injection apparatus 500, and the desulfurizing agent and nitrogen are mixed.

5, the desulfurizer feeder 600 includes a desulfurizer feed tank 610 in which a desulfurizer of CaO is stored, and a desulfurizer feeder 610 connected to the desulfurizer feed tank 610 to feed the desulfurizer feed tank 610 And a desulfurizing agent feed hopper 630 for feeding a desulfurizing agent that is conveyed through the conveying conveyor 620 to the desulfurizing agent feeding lance 410. The desulfurizing agent feeding lance 410 is provided with a desorbing agent feed hopper 630 ).

The desulfurizing agent supply tank 610 is connected to the main supply tank 611 in which the desulfurizing agent is stored and the auxiliary supply tank 612 to supply the desulfurizing agent when the desulfurizing agent stored in the main supply tank 611 is consumed or when the main supply tank 611 fails. ).

At this time, a rotary valve 613 is provided below the main supply tank 611 and the auxiliary supply tank 612 so as to control the desulfurizing agent supplied to the conveying conveyor 620 and electrically connected to a controller (not shown) Respectively.

The desulfurizer charging lance 410 is vertically installed inside the heating ladle 100 while being connected to the desulfurizer supply device 600 and the nitrogen injection device 500.

That is, the desulfurizing agent inlet lance 410 located at the inner side of the hot-ladle ladle 100 is vertically installed, so that the desulfurizer supplied to the desulfurizer inlet lance 410 is introduced into the hot- So that it can be strongly accepted.

The lifting and lowering bar 420 is welded to the upper part of the desulfurizing agent charging lance 410 and positioned inside the frame 210 to be connected to the lifting and lowering part 430. The lifting and lowering bar 420 is connected to the desulfurizing agent charging lance 410, And then,

A plurality of guide rollers 440 are installed on both sides of the up / down bar 420 so that the up / down bar 420 can smoothly move up and down according to the operation of the up / down /

That is, a plurality of guide rollers 440 are installed on the frame 210 of the impeller actuating device 200 so that the elevating and lowering bar 420 can be smoothly guided by the guide rollers 440 .

The ascending and descending portion 430 is connected to the ascending and descending bar 420 on the upper portion of the inner side of the frame 210 of the impeller actuating device 200 to operate the ascending and descending bar 420 up and down.

The ascending and descending portion 430 is connected to the upper portion of the ascending and descending bar 420. The descending and descending portion 420 is connected to the connecting portion 431 and connected to the frame 210, Descending cylinder 432 for allowing the user to operate the machine.

At this time, the ascending / descending cylinder 432 is electrically connected to a controller (not shown).

The nitrogen injection device 500 is connected to the elevated desulfurization device 400 to inject high-pressure nitrogen, thereby strongly desulfurizing the molten iron into the molten iron 110 while the desulfurizing agent and nitrogen are mixed.

5, the nitrogen injection apparatus 500 includes a nitrogen injection hose 510 connected to the desulfurizing agent inlet lance 410 of the elevating desulfurization apparatus 400, and a nitrogen injection hose 510 connected to the nitrogen injection hose 510 And a nitrogen supply unit 520 for supplying high pressure nitrogen to the nitrogen injection hose 510.

Between the nitrogen injection hose 510 and the nitrogen supply unit 520, an auxiliary nitrogen tank 530 for storing nitrogen is installed.

That is, when nitrogen is not supplied from the nitrogen supply unit 520 due to failure of the nitrogen supply unit 520, the auxiliary nitrogen tank 530 may be opened to inject the stored nitrogen into the desulfurizer loading lance 410 do.

The operation state of the molten iron desulfurizer blowing system according to the present invention composed of the above system will be described below.

In order to remove the sulfur contained in the molten iron 110 of the charred ladle 100, a desulfurizing agent of CaO is introduced into the molten iron 110 through the elevated desulfurization device 400, 200, the impeller 300 is rotated and stirred.

When the desulfurizing agent is supplied from the desulfurizing agent supplying device 600 to the elevating type desulfurizing device 400, nitrogen of high pressure is injected into the desulfurizing agent supplying lance 410 of the elevating type desulfurizing device 400 in the nitrogen injecting device 500 The desulfurizing agent is mixed with the nitrogen and blown into the molten iron 110 at a high pressure.

At this time, the elevating type desulfurization device 400 is installed integrally with the impeller actuating device 200 inside the impeller actuating device 200 and is operated while being raised and lowered together with the impeller 300, The installation cost can be reduced and the operation becomes convenient.

The desulfurizing agent inlet lance 410 connected to the nitrogen injection hose 510 of the nitrogen injection apparatus 500 is vertically installed inside the hot metal ladle 100 so that the high pressure injected from the nitrogen injection hose 510 The desulfurizing agent can be blown deep into the molten iron 110 by the nitrogen of the molten iron.

When the desulfurizing agent supply lance 410 is supplied with the desulfurizing agent by connecting the nitrogen injection hose 510 to the desulfurizing agent input lance 410, high-pressure nitrogen is supplied from the nitrogen supply unit 520 to the nitrogen injection hose 510 The molten metal flows into the desulfurizing agent inlet lance 410 to be mixed with the desulfurizing agent and the desulfurizing agent is strongly blown into the molten metal vessel 110.

The desulfurizing agent input lance 410 is fixed by welding with the elevating and lowering bar 420 so that the elevating and lowering bar 420 is moved up and down by the operation of the up and down cylinder 432, It is possible to optimize the desulfurization process by raising and lowering the inside of the hot ladle 100.

As described above, the present invention is not limited to the above-described specific preferred embodiments, and any person skilled in the art can make various modifications without departing from the gist of the present invention. It is to be understood that such changes and modifications are intended to fall within the scope of the appended claims.

100: Charter ladle 110: Charter
120: cover 200: impeller actuator
210: frame 220:
221: drive motor 222: drive shaft
223: Reducer 224: Ball bearing
300: impeller 400: lifting type desulfurization device
410: Desulfurizing agent input lance 420: Up and down bar
430: ascending / descending portion 431:
432: lifting cylinder 440: guide roller
500: nitrogen injection device 510: nitrogen injection hose
520: nitrogen supply part 530: auxiliary nitrogen tank
600: Desulfurizer feeder 610: Desulfurizer feeder
611: main supply tank 612: auxiliary supply tank
613: Rotary valve 620: Feed conveyor
630: Desulfurization feed hopper

Claims (12)

An impeller operating device installed at the top of the charger ladle;
An impeller connected to the impeller actuating device;
An uprising type desulfurizing device integrally installed in the impeller operating device for blowing the desulfurizing agent into the molten iron of the hot desiccator; And
A nitrogen injection device connected to the elevated desulfurization device for injecting high-pressure nitrogen mixed with a desulfurizing agent so that the desulfurizing agent can be strongly blown into the molten iron;
/ RTI >
The elevating type desulfurization apparatus includes:
A desulfurizing agent inlet lance installed inside the impeller operating device to allow the desulfurizing agent to be blown into the molten iron wire,
An elevating and lowering bar welded to the desulfurizing agent inlet lance to raise and lower the desulfurizer inlet lance,
And an ascending and descending portion connected to an inner upper portion of the impeller actuating device to move up and down the bar,
A plurality of guide rollers are installed on both outer sides of the up-down bar so as to be able to move up and down smoothly according to the operation of the up-down bar,
Wherein the ascending and descending portion includes a connecting port for connecting the ascending and descending bar and an ascending and descending cylinder connected to the connecting port for operating the ascending and descending bar upwardly and downwardly,
The nitrogen injection device includes a nitrogen injection hose connected to the desulfurizing agent inlet lance of the elevated desulfurizer and injecting high-pressure nitrogen into the desulfurizer inlet lance so as to be mixed with the desulfurizer, and a nitrogen supply hose / RTI > wherein the molten iron desulfurizing agent is added to the molten iron. The method according to claim 1,
The impeller operating device includes:
A frame for allowing the impeller to be installed,
And an operating portion connected to the impeller inside the frame to operate the impeller. 3. The method of claim 2,
The operation unit includes a drive motor connected to the inner side of the frame by an impeller and a drive shaft to rotate the drive shaft to rotate the impeller, and a speed reducer installed on the drive shaft to reduce the speed of the drive motor. system. The method of claim 3,
Wherein a ball bearing is installed on the outside of the drive shaft so as to rotate the impeller smoothly by driving the drive motor. delete delete The method according to claim 1,
Wherein the desulfurizing agent inlet lance is connected to the desulfurizer feeder and the end of the desulfurizer is discharged vertically to the inside of the hot lease ladder. 8. The method of claim 7,
The desulfurizing agent supply device includes:
A desulfurizing agent supply tank in which a desulfurizing agent is stored,
A transfer conveyor connected to the desulfurizing agent supply tank for transferring the desulfurizing agent,
And a desulfurizing agent supply hopper installed at a lower portion of an end of the conveying conveyor so as to supply a desulfurizing agent fed through the conveying conveyor to the desulfurizing agent feeding lance. 9. The method of claim 8,
Wherein the desulfurizing agent supply tank is divided into a main supply tank and an auxiliary supply tank, and a rotary valve is installed in each of the main supply tank and the lower portion of the auxiliary supply tank so as to control the desulfurizing agent supplied as a conveying conveyor. system. delete delete The method according to claim 1,
Wherein an auxiliary nitrogen tank is provided between the nitrogen inlet hose and the nitrogen feed.
KR1020150181645A 2015-12-18 2015-12-18 Injecting system of desulfurizing agent for molten iron KR101646947B1 (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3999979A (en) * 1974-12-12 1976-12-28 British Steel Corporation Removal of sulphur from molten metal
KR100749022B1 (en) 2006-03-22 2007-08-13 주식회사 포스코 Method for desulfurization of hot metal
CN101514379A (en) * 2009-04-03 2009-08-26 北京首钢国际工程技术有限公司 Hot metal ladle car on-line molten iron desulphurization pretreatment system
KR20100034538A (en) * 2008-09-24 2010-04-01 주식회사 포스코 Ascending and descending apparatus
KR20110003809U (en) * 2009-10-12 2011-04-20 한국서부발전 주식회사 Agitator for absorber of desulfurization equipment

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3999979A (en) * 1974-12-12 1976-12-28 British Steel Corporation Removal of sulphur from molten metal
KR100749022B1 (en) 2006-03-22 2007-08-13 주식회사 포스코 Method for desulfurization of hot metal
KR20100034538A (en) * 2008-09-24 2010-04-01 주식회사 포스코 Ascending and descending apparatus
CN101514379A (en) * 2009-04-03 2009-08-26 北京首钢国际工程技术有限公司 Hot metal ladle car on-line molten iron desulphurization pretreatment system
KR20110003809U (en) * 2009-10-12 2011-04-20 한국서부발전 주식회사 Agitator for absorber of desulfurization equipment

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