KR101036645B1 - An apparatus for manufacturing compacted irons of reduced materials comprising fine direct reduced irons and an apparatus for manufacturing molten irons using the same - Google Patents

Abstract

The present invention relates to an apparatus for manufacturing compacted irons and an apparatus for manufacturing molten irons using the same. For this, the apparatus for manufacturing compacted irons according to the present invention includes a couple of rolls and a roll casing. The couple of rolls compress reduced materials containing fine reduced irons, manufacture the compacted irons, and form a gap by being separated from each other. The roll casing is located outside of the couple of rolls and has at least one opening. Sealing plates are attached to an inner surface and an outer surface at the opening of the roll casing, respectively. A sliding tube, both ends of which the sealing plates are fixedly combined with, is closely adhered to a penetrating member penetrating the opening. According to the above present invention, it is possible to manufacture compacted irons having good quality.

Description

Device for producing compacted iron containing reduced-ring iron, and apparatus for manufacturing molten iron using the same

1 is a schematic perspective view of a compacted article manufacturing apparatus according to an embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view taken along line AA of FIG. 1.

3 is a schematic cross-sectional view taken along line BB of FIG. 1.

4 is a schematic view of a sealing device according to an embodiment of the present invention.

5 is a view schematically showing a molten iron manufacturing apparatus including a compacted material manufacturing apparatus according to an embodiment of the present invention.

The present invention relates to a compacted material manufacturing apparatus and a molten iron manufacturing apparatus using the same, and more particularly, compacted material manufacturing apparatus for producing compacted material by compressing a reduced body containing direct reduced iron (DRI) and molten iron using the same It relates to an apparatus for manufacturing molten iron.

The steel industry is a key industry that supplies basic materials to the entire industry, such as automobiles, shipbuilding, home appliances, construction, etc., and is one of the oldest industries with the development of mankind. Steel mills, which play a pivotal role in the steel industry, use molten iron and coal as raw materials to produce molten pig iron, which is then manufactured and supplied to each customer.

Currently, about 60% of the world's iron production comes from the blast furnace method developed since the 14th century. The blast furnace method is a method of manufacturing molten iron by reducing iron ore to iron by putting together coke prepared from sintering process and coke made from bituminous coal into a blast furnace. The blast furnace method, which is a large scale of the molten iron production equipment, requires a raw material having a certain level or more of strength and a particle size capable of ensuring the breathability in the furnace due to its reaction characteristics. As described above, the blast furnace method is a carbon source used as a fuel and a reducing agent. Relies on coke processing specific raw coal, and iron sources mainly rely on sintered ore through a series of bulking processes. As a result, the current blast furnace method necessarily involves preliminary processing of raw materials such as coke manufacturing facilities and sintering facilities. Therefore, it is not only necessary to construct auxiliary facilities other than blast furnaces, but also Due to the need for the installation of environmental pollution prevention equipment, there is a problem in that the manufacturing cost is rapidly increased due to the large investment cost.

In order to solve the problems of the blast furnace method, steel mills of various countries use molten coal directly as fuel and reducing agent, and as a source of iron, molten iron is manufactured by directly using spectroscopy which occupies 80% or more of the world's ore production. A great deal of effort has been put into the development of the reduced steelmaking method.

U.S. Patent No. 5,534,046 discloses an apparatus for manufacturing molten iron that uses plain coal and spectroscopy directly. The apparatus for manufacturing molten iron disclosed in U.S. Patent No. 5,534,046 consists of a three-stage flow reduction reactor in which a bubble fluidized bed is formed and a melt gasification furnace connected thereto. The spectroscopy and subsidiary materials at room temperature are charged to the first flow reduction reactor, followed by three flow reduction reactors in sequence. Since the high temperature reducing gas is supplied from the melt gasifier to the three-stage flow reduction furnace, the spectroscopic and secondary raw materials at room temperature are heated in contact with the high temperature reducing gas. At the same time, the spectroscopy and secondary raw materials at room temperature are reduced by 90% or more, fired by 30% or more, and charged into the melt gasifier.

Coal is supplied into the melt gasifier to form a coal filling layer, and spectroscopy and subsidiary materials at room temperature are melted and slaked in the coal filling layer and discharged into molten iron and slag. Oxygen is blown through a plurality of air vents installed on the outer wall by melting gasification, is converted into a high temperature reducing gas while combusting the coal packed bed, and is sent to a fluid reduction reactor to reduce spectroscopy and secondary raw materials at room temperature, and then are discharged to the outside.

However, in the above-described molten iron manufacturing apparatus, since a high-speed gas stream is formed on the upper part of the molten gasifier, there is a problem in that the branched iron and the calcined auxiliary material charged into the molten gasifier are scattered. In addition, when charging reduced iron and calcined feedstock into the molten gasifier, there is a problem that it is difficult to ensure the air permeability and liquidity of the coal filling layer in the molten gasifier.                         

In order to solve this problem, a method of briquetting reduced-reduced iron and calcined raw materials and charging them into a molten gasifier has been studied. In this regard, U. S. Patent No. 5,666, 638 discloses a method and apparatus for producing elliptical sponge iron briquettes. Further, US Pat. Nos. 4,093,455, 4,076,520, and 4,033,559 disclose methods and apparatus for producing plate- or corrugated irregular sponge iron briquettes. Here, the reduced-reduced iron is hot-hardened and cooled to be suitable for long-distance transport to produce sponge iron briquettes.

Since such a briquette manufacturing apparatus is only small, it is less likely that the reduced iron is scattered when manufacturing the sponge iron briquette. However, in the case of a large compacted material manufacturing apparatus, since the amount of reduced ring iron flowing into the roll increases, the reduced ring iron is scattered largely to the outside. Therefore, the cheek plates are provided on both sides of the roll, and the cheek plates are pressed and supported by a bar-shaped cheek plate pressing device passing through the roll casing.

However, since the roll casing is thermally deformed by the high temperature production of the compacted material, a gap is formed between the cheek plate pressing device and the penetrating portion. Since the inside of the compacted material manufacturing apparatus is almost close to a vacuum, a large amount of air is sucked into the gap, thereby reducing the reduced-iron-containing reducing agent, as well as shortening the life of the facility due to heat generation during the reoxidation.

In addition to the cheek plate pressurizing device, the necessity of forming the opening through the roll casing is increased due to other demands due to the enlargement of the compacted material manufacturing apparatus, and therefore, an apparatus having a structure for effectively sealing the opening formed in the roll casing is urgently required. It is becoming.

The present invention has been made to solve the above-described problems, and an object thereof is to provide a compacted article manufacturing apparatus suitable for mass production of compacted sheets.

Moreover, an object of this invention is to provide the molten iron manufacturing apparatus which can manufacture molten iron of high quality using the compacted material of good quality.

In order to achieve the above object, the compacted material manufacturing apparatus of the present invention comprises a pair of rolls that compress compacted iron-containing reducing bodies to produce compacted materials, which are spaced apart from each other to form a gap, and a A roll casing positioned on the outer circumference of the pair of rolls and having at least one opening formed therein, the sealing plates attached to the inner and outer surfaces of the roll casings positioned at the openings of the roll casing, respectively, and the sealing plates are fixedly coupled to both ends thereof. A sliding tube in close contact with the through member penetrating the opening is provided.

Here, it is preferable that a sealing plate is an annular member.

In addition, a locking member for fixing may be formed at one end of the sliding tube.

And it is preferable that the locking member has an annular cross section, and the outer diameter of the locking member is larger than the outer diameter of the sliding tube.

The sealing plate of any one of the sealing plates can be fixed with the fixing member.

Moreover, it is preferable that the outer diameter of the locking member for fixation is larger than the inner diameter of any one sealing plate.                     

And the other sealing plate of the sealing plate can be welded to the sliding tube.

The sealing plate welded to the sliding tube is preferably located on the outer surface of the roll casing.

In addition, the distance between the sealing plates may be substantially the same as the distance between the inner surface and the outer surface of the roll casing.

It is preferable that the penetrating surface of the penetrating portion and the outer surface of the sliding tube are spaced apart from each other.

The compacted material manufacturing apparatus of this invention is provided in the both sides of a gap, and the pair of the cheek plate which prevents the leakage of the reduced-iron-containing reducing body which flows into a gap, and the opposite side of a gap across a cheek plate. It may include a bar (bar) that penetrates through the roll casing to support the cheek plate.

In addition, the penetrating member described above in the compact manufacturing apparatus of the present invention may be a pair of rolls.

The molten iron manufacturing apparatus of the present invention includes a compacted body manufacturing apparatus having the above-described structure, a crusher for crushing the compacted body discharged from the compacted body manufacturing apparatus, and a melt gasifier for charging and melting the compacted material crushed in the crusher.

In addition, at least one coal selected from lump coal and coal briquettes may be supplied to the melting gasifier.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 5. These embodiments of the present invention are merely for illustrating the present invention and the present invention is not limited thereto.

1 is a schematic perspective view of a compacted article manufacturing apparatus according to an embodiment of the present invention, a pair of charging hopper 10 and a pair of rolls (including a gear attached to the end of the roll) 20 The compacted object manufacturing apparatus 100 containing these is shown schematically. The structure of the compacted body manufacturing apparatus shown in FIG. 1 is only for illustration of this invention, Comprising: This invention is not limited to this. Therefore, the form of the compacted body manufacturing apparatus can be modified into various other structures. In particular, the reduced-ring iron-containing reducing agent may be introduced into the pair of rolls 20 in various forms other than the charging hopper 10.

Through the opening 16 located in the center of the pair of charging hoppers 10 shown in FIG. 1, a reducing body containing a reduced iron is charged in the direction indicated by the arrow A '. The reduced reducing iron-containing reducing body is prepared from iron ore, and further includes a calcined auxiliary material and is reduced and manufactured through a multi-stage flow reduction furnace. You may charge into the charging hopper 10 the reduced-ring iron containing reducing body manufactured by other methods. An exhaust hole 14 is formed in an upper portion of the charging hopper 10 to remove the gas generated from the high-temperature reducing iron-containing reducing substance flowing into the charging hopper 10. Inside the charging hopper 10, a scraper 124 (shown in FIG. 2) is installed in the screw feeder 12 to remove the branched iron attached to the inner wall of the charging hopper 10.

The charging hopper 10 includes a screw tube 70, which is fitted into a feeding box 30 located below, and the lower part of the feeding box 30 is a cheek plate. It is fixedly supported by 80 (shown in FIG. 2 and the same below).                     

Inside each charging hopper 10 is provided a screw feeder 12 for discharging the reduced iron-containing reducing agent flowing into the charging hopper 10 into a gap between the pair of rolls 20. The gap here refers to the space between the rolls which exist along the longitudinal direction of a pair of rolls. The screw feeder 12 has a screw 122 (shown in FIG. 2) formed at a lower end thereof, and the reduced feed iron-containing reducing agent collected at the lower side by gravity is rotated downward by the rotation of a motor (not shown) attached to the upper side. Forced discharge

A roll casing 24 is positioned on the outer circumference of the pair of rolls 20, and the pair of rolls 20 contains the reduced iron content reduced by the screw feeder 12 from the charging hopper 10. The compacted body is prepared by compressing the sieve. The pair of rolls 20 are spaced apart from each other to form a gap. A roll cover 26 is attached to the outside of the roll 20, and a plurality of frame members are provided on the outer circumference of the roll casing 24 although not shown in FIG.

Hereinafter, the internal structure of the compacted material manufacturing apparatus according to an embodiment of the present invention, in particular the roll casing sealing device will be described in more detail with reference to FIGS. 2 and 3.

FIG. 2 is a schematic cross-sectional view taken along the line AA of FIG. 1 in a Z-axis direction, and includes a cheek plate 80 supporting both sides of the roll 20 and a bar plate that supports the cheek plate 80 under pressure. The cheek plate pressurizing device 90 is shown. The roll casing sealing device 300 is used to seal the opening formed in the roll casing 24. As shown in Fig. 2, the application of the present invention with the cheek plate pressurizing device 90 as a penetrating member is merely for illustrating the present invention, and the present invention is not limited thereto. Therefore, the present invention can be applied to other penetrating members.

The reduced iron-containing reducing body is introduced into the feed box 30 by the screw feeder 12 through the screw tube 70. The supply box 30 is installed at the lower portion of the charging hopper 10 to deliver the reduced iron-containing reducing body to the pair of rolls 20, and forms a convex space at the lower portion thereof facing the charging hopper 10. . Accordingly, it is possible to secure the stagnant layer of the reducing iron-containing reducing body flowing in a large amount and supply it to the center of the gap.

In the lower part of the supply box 30, as a large amount of reducing iron-containing reducing bodies flows into and stagnates, the reducing iron is likely to scatter to the outside. Therefore, a pair of cheek plates 80 are installed on both sides of the gap between the rolls to prevent leakage of the reduced-iron-containing reducing body flowing into the gap. In particular, in order to prevent the cheek plate 80 from being deformed and scattered iron from being scattered due to the internal pressure increase and the high temperature, the cheek plate 80 should be pressure-supported.

To this end, the compacted material manufacturing apparatus according to an embodiment of the present invention, pressing the cheek plate 80 through the frame member 28 and the roll casing 24 on the opposite side of the gap with the cheek plate 80 therebetween. And a cheek plate pressurizing device 90 comprising a supporting bar. In this case, the sealing device 300 shown by the circle | round | yen in FIG. 2 is installed in the penetrating part of the roll casing 24 through which the bar which is a penetrating member penetrates and inflow of external air. Hereinafter, an example in which the present invention is applied to a penetrating member other than the bar described above will be described with reference to FIG. 3.

3 is a schematic cross-sectional view taken along the line BB of FIG. 1 in a Z-axis direction, showing a cross section of the roll 20 slightly protruding out of the roll casing 24 and the sealing device 300 around the roll casing 24. Doing. As shown in FIG. 3, the application of the present invention with the roll 20 as a penetrating member is merely to exemplify the present invention, and the present invention is not limited thereto.

When the roll 20 is formed so as to slightly protrude through the opening formed in the roll casing 24, since there is a possibility that outside air flows into the roll casing 24 through the periphery of the roll 20, the roll 20 By installing the sealing device 300 on the outer circumference of the) to prevent this. The sealing device 300 is a sliding tube 106 which is located in the opening of the roll casing 24 and attached to the inner and outer surfaces thereof, and the sealing plate is fixedly coupled to both ends and the roll 20 penetrates through the opening. ). In FIG. 3, only the sealing plate 106 attached to the outer surface of the roll casing 24 is shown in the sealing plate.

Hereinafter, the sealing device 300, which is briefly illustrated as a circle in FIG. 2, will be described in more detail with reference to FIG. 4.

4 is a schematic diagram of a sealing device according to an embodiment of the present invention, showing a sealing device 300 installed in the penetrating portion 242 of the roll casing 24 of the triple structure.

The sealing device 300 according to the embodiment of the present invention shown in FIG. 4 includes a sealing plate 102 and 104 and a sliding tube 106. The sealing plates 102 and 104 are annular members, which are the first sealing plate 102 attached to the inner surface of the roll casing 24 and the second sealing plate 104 attached to the outer surface of the roll casing 24. Divided. The sliding tube 106 is the first sealing plate 102 and the second sealing plate 104 is fixedly coupled to both ends, and the cheek plate pressing device 90 which can move in the left and right directions in the pressing direction as indicated by the arrow. Close contact with

The sealing device 300 not only seals the through part 242 with the sealing plates 102 and 104, but also the sliding tube 106 is in close contact with the cheek plate pressurizing device 90, so that the sealing device 300 is moved from the outside into the compact manufacturing device. To block the air intake. As a result of the blocking of air inflow, not only the scattering of the reduced iron in the compacted material manufacturing apparatus can be prevented, but also the explosion due to the reoxidation of the reduced iron containing reducing agent can be prevented.

Meanwhile, since the through surface of the through part 242 and the outer surface of the sliding tube 106 are spaced apart from each other by a predetermined distance between the first sealing plate 102 and the second sealing plate 104, a high temperature compacted material is produced. Even if the diameter of the penetrating portion 242 decreases as the roll casing 24 expands, a sufficient free space may be secured without interfering with the cheek plate pressing device 90.

Here, the assembly process of the sealing device will be described.

First, the first sealing plate 102 is fixed to the through portion of the roll casing 24 from the inner surface side of the roll casing 24. Since the first sealing plate 102 is an annular member, the first sealing plate 102 is continuously drilled through the through part 242. Next, the sliding tube 106 is inserted from the inner surface side of the roll casing 24 and penetrates through the 1st sealing plate 102 and the penetration part 242 one by one.

At one end of the sliding tube 106, a fixing member 106 2 having an annular cross section is formed, and the outer diameter thereof is larger than the outer diameter of the sliding tube 106. In this way, the first sealing plate 102 is fixed by the locking member 1062 formed in the sliding tube 106. In particular, the outer diameter of the fixing member 1062 is larger than the inner diameter of the first sealing plate 102, so that the first sealing plate 102 is firmly fixed between the fixing member 1062 and the inner surface of the roll casing. .

The sliding tube 106 inserted as described above penetrates the through part 242 and protrudes on the outer surface of the roll casing 24. In this case, after inserting and fixing the second sealing plate 104 on the outer surface of the roll casing 24, the second sealing plate 104 and the sliding tube 106 weld the boundary surface 108.

In the present invention, since the second sealing plate 104 is welded on the outer surface of the roll casing 24, the operation is easier. Even when the sealing device 300 is dismantled, it is easy to dismantle because only the welding is removed from the outside of the roll casing 24. The second sealing plate 104 is welded in close contact with the outer surface of the roll casing 24 so that the distance between the first sealing plate 102 and the second sealing plate 104 is between the inner surface and the outer surface of the roll casing 24. Substantially equal to the distance. Accordingly, air cannot be introduced into the compacted material manufacturing apparatus from the outside through the through part 242. In addition, since the first sealing plate 102 and the second sealing plate 104 have a sufficient area necessary for sealing, even if the sealing device 300 moves up and down by mechanical vibration, no gap is generated and external air is introduced. Can't.

After the sealing device 300 is manufactured by the method as described above, the bar of the cheek plate pressing device 90 is inserted through the sliding tube 106. Since the compacted material producing apparatus is manufactured in this manner, the possibility of outside air flowing into the compacted material manufacturing apparatus is almost eliminated.                     

The assembly process of the sealing device according to the embodiment of the present invention described above is merely to illustrate the present invention and the present invention is not limited thereto. Therefore, the sealing device can be assembled by other methods.

Hereinafter, a molten iron manufacturing apparatus using the compacted apparatus according to an embodiment of the present invention will be described in detail.

5 is a view schematically showing a molten iron manufacturing apparatus using a compacted material manufacturing apparatus according to an embodiment of the present invention, showing a molten iron manufacturing apparatus for manufacturing molten iron by charging the compacted material into a melt gasifier.

The molten iron manufacturing apparatus 200 shown in FIG. 5 is a compacted material manufacturing apparatus 100 of the present invention, a crusher 40 for crushing the compacted material discharged from the compacted material manufacturing apparatus, and the compacted material crushed by the crusher 40 It includes a melt gasifier (60) to charge and melt. In addition, it may further include a reservoir 50 for temporarily storing the compacted material crushed by the crusher 40. The structure of the crusher 40 and the melt gasifier 60 will be easily understood by those skilled in the art to which the present invention pertains, and thus the detailed description thereof will be omitted.

The melt gasifier 60 is supplied with at least one coal selected from coal and coal briquettes. In general, the coal briquettes may be an example of coal having a particle size of more than 8 mm taken from the production site, and the coal briquettes may be coal formed by pressing by crushing coal having a particle size of 8 mm or less taken from the production site.

This kind of coal is charged into the melt gasifier 60 and oxygen (O ₂ ) is supplied to melt the compacted material and then discharge it to the hot water outlet. In this way, molten iron of good quality can be easily produced.

In the compact manufacturing apparatus of the present invention, since a sealing plate attached to each of the inner and outer surfaces of the opening of the roll casing, and a sliding tube are fixed to both ends and are in close contact with the through member penetrating through the opening, are provided with By preventing air intake, it is possible to prevent shortening of equipment life due to reoxidation and regeneration of reduced reducing iron containing reduced iron.

Since the sealing plate is an annular member, the sealing plate can be easily inserted into the sliding tube, and there is an advantage in that the fixing is convenient and the sealing is easy.

A locking member for fixing is formed at one end of the sliding tube so that the sealing plate can be easily fitted and combined.

In addition, since the fixing member has an annular cross section and the outer diameter of the fixing member is larger than that of the sliding tube, the fixing tube can be easily fixed to the roll casing.

The sealing member for fixing can fix the sealing plate of any one of the sealing plates, so that the work is convenient at the time of assembly and disassembly.

Here, since the outer diameter of the locking member for fixing is larger than the inner diameter of any one of the sealing plates, the sealing plate is fixed to the roll casing without falling out of the sliding tube.

In addition, since the other sealing plate of the sealing plate is welded to the sliding tube, the compacted material manufacturing apparatus can be firmly sealed regardless of mechanical vibration.

And since the sealing plate welded to a sliding tube is located on the outer surface of a roll casing, welding operation can be performed outside of a roll casing, and not only work is easy but work stability can be ensured.

Since the distance between the sealing plates is substantially the same as the distance between the inner surface and the outer surface of the roll casing, the penetration portion can be tightly sealed.

Since the penetrating surface of the penetrating portion and the outer surface of the sliding tube are spaced apart from each other, even if the roll casing expands due to high heat, sufficient space can be secured accordingly.

The compacted material manufacturing apparatus of this invention is equipped with the roll casing on the opposite side of a gap, between a pair of teak plates which are provided in the both sides of a gap, and prevents the leakage of the reduced-iron-containing reducing body which flows into a gap, and a cheek plate. The apparatus further includes a cheek plate pressurizing device including a bar that is a penetrating member penetrating and supporting the cheek plate. Since the present invention can be applied to the bar, air flowing from the outside through the bar can be easily blocked.

In the compact manufacturing apparatus of the present invention, since the roll may be a penetrating member, it is possible to effectively block air introduced from the outside through the outer circumferential surface of the roll.

Since the molten iron manufacturing apparatus of the present invention includes the compacted material manufacturing apparatus, the crusher, and the melt gasification furnace as described above, molten iron of good quality can be produced.

In addition, since at least one coal selected from the coal and coal briquettes is supplied to the melting gasifier, the finely divided coal collected at the production site can be used directly, thereby reducing production costs and having no environmental pollution.

Although the present invention has been described above, it will be readily understood by those skilled in the art that various modifications and variations are possible without departing from the spirit and scope of the claims set out below.

Claims (14)

A pair of rolls compressing the reducing iron-containing reducing body to produce compacted material, spaced apart from each other to form a gap, and A roll casing positioned on an outer circumference of the pair of rolls and having at least one opening formed therein; A sealing tube attached to each of the inner and outer surfaces of the roll casing positioned in the opening of the roll casing, and the sealing plate is fixedly coupled to both ends thereof, and a sliding tube in close contact with the through member penetrating the opening. Installed compacted material manufacturing apparatus. In claim 1, The said sealing board is a compacted body manufacturing apparatus which is an annular member. In claim 1, The compacted material manufacturing apparatus in which the locking member for fixation was formed in the end of the said sliding tube. 4. The method of claim 3, The fixing member has a ring-shaped cross-section, the outer diameter of the locking member for fixing is larger than the outer diameter of the sliding tube manufacturing apparatus. 4. The method of claim 3, The compacted material manufacturing apparatus which fixes the sealing plate of any one of the said sealing plates by the said locking member for fixation. In claim 5, An outer diameter of the locking member for fixing is larger than the inner diameter of any one of the sealing plate manufacturing apparatus. In claim 5, The compacted body manufacturing apparatus which welds the other sealing plate of the said sealing plate to the said sliding tube. In claim 7, The sealing plate welded to the sliding tube is located on the outer surface of the roll casing manufacturing apparatus. In claim 1, And the distance between the sealing plates is substantially equal to the distance between the inner and outer surfaces of the roll casing. In claim 1, The through surface of the penetrating portion and the outer surface of the sliding tube is a compacted material manufacturing apparatus spaced apart from each other. In claim 1, A pair of cheek plates installed on both sides of the gap to prevent leakage of the reducing iron-containing reducing agent flowing into the gap; Cheek plate pressurizing device including a bar, which is the through member, which penetrates and supports the cheek plate through the roll casing, on the opposite side of the gap with the cheek plate interposed therebetween. Compacted material manufacturing apparatus further comprising a. In claim 1, The compacted body manufacturing apparatus whose said pair of rolls is the said through member. Apparatus for producing compacted material according to claim 1, Crusher for crushing the compacted material discharged from the compacted material manufacturing apparatus, And Melting gas furnace to charge and melt the compacted material crushed in the crusher Iron manufacturing apparatus comprising a. The method of claim 13, A molten iron manufacturing apparatus for supplying at least one coal selected from lump coal and coal briquettes into the melting gasifier.

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