EP1781829A1

EP1781829A1 - Apparatus for manufacturing compacted irons of reduced materials comprising fine direct reduced irons and apparatus for manufacturing molten irons using the same.

Info

Publication number: EP1781829A1
Application number: EP05761282A
Authority: EP
Inventors: Do-Seung POSCO KIM; Il-Hyun POSCO CHO; Min-Chul POSCO PARK; Kwang-Hee POSCO LEE
Original assignee: Posco Co Ltd
Current assignee: Posco Holdings Inc
Priority date: 2004-07-16
Filing date: 2005-07-15
Publication date: 2007-05-09
Anticipated expiration: 2025-07-15
Also published as: BRPI0506141B1; WO2006009371A1; BRPI0506141A; ATE432998T1; ZA200601409B; EP1781829B1; EP1781829B8; DE602005014784D1; CN100529119C; CN1842607A; KR20060006494A; EP1781829A4; KR101036645B1

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

APPARATUS FOR MANUFACTURING COMPACTED IRONS OF REDUCED

MATERIALS COMPRISING FINE DIRECT REDUCED IRONS AND APPARATUS FOR MANUFACTURING MOLTEN IRONS USING THE SAME

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to an apparatus for manufacturing compacted irons and an apparatus for manufacturing molten irons using the same, and more particularly, to an apparatus for manufacturing compacted irons by compacting reduced materials comprising fine direct reduced irons and manufacturing compacted irons and an apparatus for manufacturing molten irons using the same.

2. Description of the Related Art

The iron and steel industry is a core industry that supplies the basic materials needed in construction and in the manufacture of automobiles, ships, home appliances, etc. Further, it is an industry which has the longest history having advanced since the dawn of human history. Iron works, which play a pivotal roll in the iron and steel industry, produce steel from molten iron, and then supply it to customers, after first producing the molten iron (i.e., pig iron in a molten state) using iron ores and coals as raw materials.

Nowadays, approximately 60% of the world's iron production is produced using a blast furnace method that has been developed since the 14th century. According to the blast furnace method, irons ores, which have gone through a sintering process, and cokes, which are produced using bituminous coals as raw materials, are charged into a blast furnace together and oxygen is supplied to the blast furnace to reduce the iron ores to irons, thereby manufacturing molten irons. The blast furnace method, which is the most popular in plants for manufacturing molten irons, requires that raw materials have strength of at least a predetermined level and have grain sizes that can ensure permeability in the furnace, taking into account reaction characteristics. For that reason, cokes i that are obtained by processing specific raw coals are needed as carbon sources to be used as a fuel and as a reducing agent. Also, sintered ores that have gone through a successive agglomerating process are needed as iron sources. Accordingly, the modern blast furnace method requires raw material preliminary processing equipment, such as coke manufacturing equipment and sintering equipment. Namely, it is necessary to be equipped with subsidiary facilities in addition to the blast furnace, and also equipment for preventing and minimizing pollution generated by the subsidiary facilities. Therefore, the heavy investment in the additional facilities and equipment leads to increased manufacturing costs.

In order to solve these problems with the blast furnace method, significant effort is made in iron works all over the world to develop a smelting reduction process that produces molten irons by directly using fine coals as a fuel and as a reducing agent and by directly using fine ores, which account for more than 80% of the world's ore production.

An installation for manufacturing molten irons directly using raw coals and fine iron ores is disclosed in US Patent No. 5,534,046. The apparatus for manufacturing molten irons disclosed in US Patent No. 5,534,046 includes three-stage fluidized-bed reactors forming a bubbling fluidized bed therein and a melter-gasifier connected thereto. The fine iron ores and additives at room temperature are charged into the first fluidized-bed reactor and successively go through three-stage fluidized-bed reactors. Since hot reducing gas produced from the melter-gasifier is supplied to the three-stage fluidized-bed reactors, the temperature of the iron ores and additives is raised by contact with the hot reducing gas. Simultaneously, 90% or more of the iron ores and additives are reduced and 30% or more of them are sintered, and they are charged into the melter-gasifier.

A coal packed bed is formed in the melter-gasifier by supplying coals thereto. Therefore, iron ores and additives at room temperature are melted and slagged in the coal packed bed and then are discharged as molten irons and slags. The oxygen supplied from a plurality of tuyeres installed on the outer wall of the melter-gasifier burns a coal packed bed and is converted to a hot reducing gas. Then, the hot reducing gas is supplied to the fluidized-bed reactors in order to reduce iron ores and additives and then is exhausted outside.

However, since a high-speed gas flow is formed in the upper portion of the melter-gasifier included in the above-mentioned apparatus for manufacturing molten irons, there is a problem in that the fine reduced irons and sintered additives charged into the melter-gasifier are elutriated and loosened. Furthermore, when fine reduced irons and sintered additives are charged into the melter-gasifier, there is a problem in that permeability of gas and liquid in the coal packed bed of the melter-gasifier cannot be ensured.

For solving these problems, the method for briquetting fine reduced irons and sintered additives and charging them into the melter-gasifier has been developed. Relating to the above development, US Patent No. 5,666,638 discloses a method for manufacturing oval-shaped briquettes made of sponge irons and an apparatus using the same. In addition, US Patent Nos. 4,093,455, 4,076,520, and 4,033,559 disclose a method for manufacturing plate-shaped or corrugation-shaped briquettes made of sponge irons and an apparatus using the same. Here, fine reduced irons are hot briquetted and then cooled, and thereby they are manufactured into briquettes made of sponge irons in order to suitably transport them a long distance.

Since the above apparatuses for manufacturing briquettes are small-sized there is little possibility that fine reduced irons are elutriated during manufacturing briquettes made of sponge irons. However, in the case of a large-sized apparatus for manufacturing compacted irons, a large amount of fine reduced irons are elutriated outside since the amount of the fine reduced irons is increased. Therefore, cheek plates are installed on both sides of the rolls and a device for pressing the cheek plates, which is shaped as a bar and penetrates through the roll casing, presses and supports the cheek plates. However, since the roll casing is thermally transformed by manufacturing hot briquettes, a space is formed between the device for pressing a cheek plate and the opening. Since the inside of the apparatus for manufacturing compacted irons is almost evacuated, a large amount of air is suctioned to the space. Therefore, there is a problem that the reduced materials containing fine reduced irons are not only re-oxidized but also that a life span of an installation decreases due to the generation of heat during re-oxidization.

The necessity for forming the opening by penetrating the roll casing increases as the apparatus for manufacturing compacted irons becomes large-sized and other conditions are demanded beside the device for pressing a cheek plate. Therefore, an apparatus having a structure of effectively sealing the opening formed on the roll casing is really required.

SUMMARY OF THE INVENTION The object of the present invention has been made to solve the above-mentioned problems and provides an apparatus for manufacturing compacted irons that is suitable for manufacturing a large amount of compacted irons.

In addition, the object of the present invention has been made to provide an apparatus for manufacturing molten irons capable of manufacturing molten irons having good quality using compacted irons having good quality.

The apparatus for manufacturing compacted irons according to the present invention includes a couple of rolls which compress reduced materials containing fine reduced irons, manufacture the compacted irons, and form a gap by being separated from each other, and a roll casing located outside of the couple of rolls and having at least one opening. Sealing plates are attached to an inner surface and an outer surface at each 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. Here, each sealing plate is preferably a ring-shaped member. A hitching member for fixing may be formed on one end of the sliding tube.

In addition, it is preferable that a section of the hitching member for fixing is ring-shaped and the outer diameter of the hitching member for fixing is larger than that of the sliding tube.

One sealing plate among the sealing plates may be fixed by the hitching member for fixing.

Also, it is preferable that an outer diameter of the hitching member for fixing is larger than an inner diameter of the one sealing plate. In addition, the other sealing plate among the sealing plates may be welded to the sliding tube.

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

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

It is preferable that penetrating surface of the opening is separated from an outer surface of the sliding tube.

The apparatus for manufacturing compacted irons according to the present invention may further include a couple of cheek plates installed at both sides of the gap preventing the reduced materials containing fine reduced irons entering into the gap from leaking, and a device for pressing each cheek plate comprising a bar, which is a penetrating member, penetrating the roll casing, and pressing and supporting each cheek plate at an opposite side of the gap. Each cheek plate may be located between the gap and the bar.

In addition, in the apparatus for manufacturing compacted irons according to the present invention, the above penetrating members are the couple of rolls.

The apparatus for manufacturing molten irons according to the present invention includes the apparatus for manufacturing compacted irons having the above-identified structure, a crusher for crushing compacted irons discharged from the apparatus for manufacturing compacted irons, and a melter-gasifier into which the compacted irons, which are crushed by the crusher, are charged and melted.

In addition, at least one of the coals selected from the group of lumped coals and coal briquettes may be supplied to the melter-gasifier.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other features and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings. Fig. 1 is a schematic perspective view of an apparatus for manufacturing compacted irons according to an embodiment of the present invention. Fig. 2 is a schematic sectional view along a line A-A of Fig. 1 . Fig. 3 is a schematic sectional view along a line B-B of Fig. 1. Fig. 4 schematically shows a sealing device according to an embodiment of the present invention.

Fig. 5 schematically shows an apparatus for manufacturing molten irons including the apparatus for manufacturing compacted irons according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE INVENTION Now, exemplary embodiments of the present invention will be described with reference to the attached drawings in order for those skilled in the art to work out the present invention. However, the present invention can be embodied in various modifications and thus is not limited to the embodiment described below. Embodiments of the present invention will be explained below with reference to Figs. 1 to 5. The embodiments of the present invention are merely to illustrate the present invention and the present invention is not limited thereto.

Fig. 1 schematically shows an apparatus for manufacturing compacted irons according to an embodiment of the present invention where the apparatus for manufacturing compacted irons 100 including a charging hopper 10 and a couple of rolls 20 is shown (gears attached to ends of the rolls are also included and shown). The structure of the apparatus for manufacturing compacted irons shown in Fig. 1 is merely to illustrate the present invention and the present invention is not limited thereto. Therefore, the structure of the apparatus for manufacturing compacted irons can be modified in other various forms. Especially, the reduced materials containing fine reduced irons may enter into the couple of rolls 20 using other various methods except the charging hopper 10.

As shown in Fig. 1 , the reduced materials containing fine reduced irons are charged into the charging hopper 10 through the opening 16 located in the center thereof along the direction indicated by the arrow A'. The reduced materials containing fine reduced irons are manufactured from iron ores. The reduced materials containing fine reduced irons further contain sintered additives and are reduced and manufactured while going through multi-stage fluidized-bed reactors. Reduced materials containing fine reduced irons manufactured by using other methods can be charged into the charging hopper 10. Ventilation openings 14 are formed on the upper side of the charging hopper 10, thereby eliminating gas produced from the hot reduced materials containing fine reduced irons which enter into the charging hopper 10. Scrapers 124 (shown in Fig. 2) are installed on screw feeders 12 in the charging hopper 10, thereby eliminating the reduced materials containing fine reduced irons stuck to the inner wall of the charging hopper 10.

The charging hopper 10 includes screw tubes 70. The screw tubes 70 are inserted into and combined with a feeding box 30 located therebelow and the lower portion of the feeding box 30 is fixedly supported by cheek plates 80 (shown in Fig. 2).

The screw feeders 12 are installed in the charging hopper 10. The screw feeders 12 discharge the reduced materials containing fine reduced irons charged into the charging hopper 10 to the gap between the couple of rolls 20. Here, the gap means a space formed between the rolls along the longitudinal direction of the couple of rolls. Screws 122 (shown in Fig. 2) installed at a lower end of the screw feeders 12 forcibly discharge the reduced materials containing fine reduced irons collected in their lower portions due to gravity downward by rotating by a motor attached above (not shown). The roll casing 24 is located outside of the couple of rolls 20. The couple of rolls 20 compress the reduced materials containing fine reduced irons discharged by the screw feeders 12 and thereby manufacture compacted irons. The couple of rolls 20 are separated from each other and form a gap. A roll cover 26 is attached outside of each roll 20, and a plurality of frame members are installed outside of the roll casing 24 (not shown in Fig. 1).

The internal structure of the apparatus for manufacturing compacted irons according to an embodiment of the present invention, especially a sealing device for sealing the roll casing is explained in detail below with reference to Figs. 2 and 3. Fig. 2 is a schematic sectional view along a line A-A of Fig. 1 and a Z-axis direction where cheek plates 80, supporting both sides of a roll 20, and bar-shaped devices for pressing the cheek plates 90, for pressing and supporting the cheek plate 80, are shown. Openings formed in the roll casing 24 are sealed by the sealing devices 300 for sealing the roll casing 24. As shown in Fig. 2, an application of the present invention in which the device for pressing a cheek plate 90 is used as a penetrating member is merely to illustrate the present invention and the present invention is not limited thereto. Therefore, the present invention can be applied to other penetrating members.

The reduced materials containing fine reduced irons enter into the feeding box 30 through the screw tubes 70 by the screw feeders 12. The feeding box 30, which is installed under the charging hopper 10, transfers the reduced materials containing fine reduced irons to the couple of rolls 20. The feeding box 30 forms a bulged space inside toward the charging hopper 10. Therefore, it is possible to secure a stagnating space of a large amount of the reduced materials containing fine reduced irons entering into the feeding box 30 and to supply them to the center portion of the gap.

There is a large possibility that the fine reduced irons are elutriated outside as a large amount of the reduced materials containing fine reduced irons enters into the feeding box 30 and stagnates therein. Therefore, a couple of cheek plates 80 are installed at both sides of the gap between the rolls, and then the reduced materials containing fine reduced irons, which enter into the gap, are prevented from leaking outside. Especially, the cheek plates 80 should be pressed and supported in order for the reduced materials containing fine reduced irons not to elutriate due to transformation of the cheek plates 80. The cheek plates 80 are transformed due to the increase of the internal pressure and hot temperature.

For this, the apparatus for manufacturing compacted irons according to an embodiment of the present invention includes a device for pressing a cheek plate 90 including a bar penetrating a frame member 28 and the roll casing 24, which presses and supports a cheek plate 80 in an opposite direction of the gap. The cheek plate 80 is located between the gap and the device for pressing a cheek plate 90. In this case, a sealing device 300, shown in a circle of Fig. 2, is installed in each penetrating portion of the roll casing 24 through which a bar as a penetrating member penetrates, thereby preventing entry of an outside air. The present invention can be applied to other penetrating members except the above-mentioned bar. The example to which the present invention is applied will be explained in detail below.

Fig. 3 is a schematic sectional view along the line B-B and a Z-axis direction of Fig. 1 where a section cutting the rolls 20 protruding a little bit outside from the roll casing 24 and sealing devices 300 surrounding the rolls 20 is shown. As shown in Fig. 3, the application of the present invention in which the rolls 20 are used as penetrating members, is merely to illustrate the present invention and the present invention is not limited thereto.

When the rolls 20 are formed to penetrate openings formed in the roll casing 24 and to protrude a little bit, there is a possibility that outside air enters into the roll casing 24 through the circumstances of the rolls 20. Therefore, a sealing device 300 is installed at an outer surface of each roll 20 preventing the above case from happening. Each sealing device 300 includes sealing plates attached to the inner surface and outer surface at each opening of the roll casing 24, respectively and a sliding tube 106 closely adhered to the roll 20 penetrating the opening. The sealing plates are fixedly combined with both ends of the sliding tube 106. Fig. 3 only shows a sealing plate 104 attached to the outer surface of the roll casing 24 among the sealing plates.

The sealing device 300 schematically shown in a circle of Fig. 2 will be explained in detail below with reference to Fig. 4.

Fig. 4 schematically shows a sealing device 300 according to an embodiment of the present invention where the sealing device 300 is installed in a penetrating portion 242 of the roll casing 24 having a three-step structure.

The sealing device 300 according to an embodiment of the present invention shown in Fig. 4 mainly includes sealing plates 102 and 104, and a sliding tube 106. The sealing plates 102 and 104 are ring-shaped members and are divided into a first sealing plate 102 attached to the inner surface of the roll casing 24 and a second sealing plate 104 attached to the outer surface of the roll casing 24. The first sealing plate 102 and the second sealing plate 104 are firmly combined with both ends of the sliding tube 106, which is closely adhered to the device for pressing a cheek plate 90 capable of moving in left and right directions, namely a pressing direction as indicated by the arrow.

The sealing device 300 not only seals the penetrating portion 242 with sealing plates 102 and 104 but also the sliding tube 106 is closely adhered to the device for pressing a cheek plate 90, thereby preventing the outside air from entering into the apparatus for manufacturing compacted irons. As the air is prevented from entering into the apparatus for manufacturing compacted irons, it is not only possible to prevent the reduced materials containing fine reduced irons in the apparatus for manufacturing compacted irons from elutriating but also to prevent the reduced materials containing fine reduced irons from exploding due to re-oxidization thereof.

Meanwhile, a penetrating surface of the penetrating portion 242 and an outer surface of the sliding tube 106 are separated from each other at a predetermined distance along the portion between the first sealing plate 102 and the second sealing plate 104, thereby securing sufficient free space to not interfere with the device for pressing a cheek plate 90 even though the diameter of the penetrating portion 242 decreases as the roll casing 24 swells due to the manufacturing of the hot compacted irons.

Herein below, an assembling process of the sealing device will be explained.

Firstly, a first sealing plate 102 is fixed in a penetrating portion of the roll casing 24 from inside of the roll casing 24. Since the first sealing plate 102 is a ring-shaped member, it is continuously penetrated with the penetrating portion

242. Next, from inside of the roll casing 24, the sliding tube 106 is inserted into, and penetrates, the sealing plate 102 and the penetrating portion 242.

A hitching member for fixing 1062 having a ring-shaped section is formed on one end of the sliding tube 106 and an outer diameter of the hitching member for fixing 1062 is formed to be larger than that of the sliding tube 106. By using this method, the first sealing plate 102 is fixed by the hitching member for fixing 1062 formed on the sliding tube 106. Especially, an outer diameter of the hitching member for fixing 1062 is larger than an inner diameter of the first sealing plate 102, and thereby the first sealing plate 102 is firmly fixed between the hitching member for fixing 1062 and the inner surface of the roll casing 24.

The sliding tube 106, which is inserted like above, penetrates the penetrating portion 242 and protrudes outside of the roll casing 24. In this case, the boundary 108 between the second sealing plate 104 and the sliding tube

106 is welded after the second sealing plate 104 is inserted and fixed on the outer surface of the roll casing 24.

According to the present invention, the operation is very easy since the second sealing plate 104 is welded on the outer surface of the roll casing 24. Even when the sealing device 300 is to be disassembled, disassembling is easy since the welding needs only to be removed from outside of the roll casing 24. By closely adhering and welding the second sealing plate 104 to the outer surface of the roll casing 24, a distance between the first sealing plate 102 and the second sealing plate 104 becomes the same as a distance between the inner surface and the outer surface of the roll casing 24. Therefore, air cannot enter into the apparatus for manufacturing compacted irons through the penetrating portion 242 from outside. In addition, the first sealing plate 102 and the second sealing plate 104 have sufficient area for sealing, and thereby a gap is not created so that the outside air may not enter into the apparatus for manufacturing compacted irons even though the sealing device 300 moves up and down by mechanical vibration.

The bar of the device for pressing a cheek plate 90 is inserted into the sliding tube 106 after the sealing device 300 is manufactured by using the above method. Since the apparatus for manufacturing compacted irons is manufactured by using the above method, there is little possibility that outside air enters into the apparatus for manufacturing compacted irons.

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

An apparatus for manufacturing molten irons using the apparatus for manufacturing compacted irons according to an embodiment of the present invention will be explained below. Fig. 5 schematically shows an apparatus for manufacturing molten irons using the apparatus for manufacturing compacted irons according to an embodiment of the present invention where Fig. 5 shows the apparatus for manufacturing molten irons by charging the compacted irons into a melter-gasifier and manufacturing molten irons. The apparatus for manufacturing molten irons 200 shown in Fig. 5 includes the apparatus for manufacturing compacted irons 100 according to the present invention, a crusher 40, and a melter-gasifier 60. The crusher 40 crushes the compacted irons discharged from the apparatus for manufacturing compacted irons 100. The compacted irons, which were crushed in the crusher 40, are charged into the melter-gasifier 60 and are melted therein. Besides, a storage bin 50 for temporarily storing the compacted irons that are crushed in the crusher 40 can also be included. Since the structure of the crusher 40 and the melter-gasifier 60 can be understood by those skilled in the art, a detailed explanation is omitted. At least one of the coals selected from the group of lumped coals and coal briquettes are charged into the melter-gasifier 60. Generally, for example, the lumped coals are coals having grain size over 8mm which are gathered from the producing district. In addition, for example, the coal briquettes are coals which are made by gathering coals having grain size of 8mm or less from the producing district, pulverizing them, and molding them by a press.

The coal packed bed is formed in the melter-gasifier 60 by charging lumped coals or coal briquettes therein. Oxygen is supplied to the melter-gasifier 60 and then the compacted irons are melted. Molten irons are discharged through a tap. Therefore, it is possible to manufacture molten irons having good quality.

In the apparatus for manufacturing compacted irons according to the present invention, sealing plates are attached to an inner surface and an outer surface at each opening of the roll casing, respectively. In addition, a sliding tube, both ends of which the sealing plates are fixedly combined with, is closely adhered to a penetrating member penetrating the opening. Therefore, it is possible to block the re-oxidization of the reduced materials containing fine reduced irons and shortening of the durability of an installation due to the re-oxidization and its generation of heat by preventing an outside air from entering inside. Since the sealing plates are ring-shaped members, there is an advantage that it can not only be simply inserted into the sliding tube but also it is convenient to fix. In addition, it is easily sealed.

A hitching member for fixing is formed on one end of each sliding tube, and thereby the sealing plate is easily inserted into and is combined with the hitching member for fixing.

In addition, a section of the hitching member for fixing is ring-shaped and the outer diameter of the hitching member for fixing is larger than that of the sliding tube, thereby the sliding tube can be easily fixed in the roll casing.

One sealing plate among the sealing plates is fixed by the hitching member for fixing, and thereby assembling and disassembling operations are convenient.

Here, since an outer diameter of the hitching member for fixing is larger than an inner diameter of the one sealing plate, the sealing plate is prevented from removing from the sliding tube and is well fixed to the roll casing. In addition, the other sealing plate among the sealing plates is welded to the sliding tube, and thereby the apparatus for manufacturing compacted irons is firmly sealed regardless of mechanical vibrations.

Furthermore, since the sealing plate welded to the sliding tube is located on an outer surface of the roll casing, the welding operation can be carried out outside of the roll casing. Therefore, the operation is not only easy but also it is possible to secure stability of the operation.

A distance between the sealing plates is substantially the same as a distance between an inner surface and an outer surface of the roll casing, and thereby the penetrating portion is firmly sealed. A penetrating surface of the penetrating portion is separated from an outer surface of the sliding tube. Therefore, free space is sufficiently secured even though the roll casing is swelled due to heat of high temperature.

The apparatus for manufacturing compacted irons according to the present invention further includes a couple of cheek plates installed at both sides of the gap preventing the reduced materials containing fine reduced irons entering into the gap from leaking and a device for pressing the cheek plates including a bar which is the penetrating member. The bar penetrates the roll casing, and presses and supports each cheek plate at an opposite side of the gap. Each cheek plate is located between the gap and the bar. Therefore, the outside air passing by the bar is easily blocked since the present invention can be applied to the bar.

In addition, in the apparatus for manufacturing compacted irons according to the present invention, the couple of rolls may be the penetrating members, thereby outside air passing through the outer surface of the rolls can be easily prevented from entering into the apparatus for manufacturing compacted irons.

The apparatus for manufacturing molten irons according to the present invention includes the above apparatus for manufacturing compacted irons, a crusher, and a melter-gasifier, thereby manufacturing molten irons having good quality. In addition, at least one of the coals selected from the group of lumped coals and coal briquettes are supplied to the melter-gasifier, thereby it is possible to directly use coals in a state of pulverized coals gathered from a producing district. Therefore, manufacturing cost not only goes down but also it is in harmony with an environment since there is no pollution. While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the sprit and scope of the invention as defined by the appended claims.

Claims

WHAT IS CLAIMED IS:

1. An apparatus for manufacturing compacted irons, comprising: a couple of rolls compressing reduced materials containing fine reduced irons, manufacturing the compacted irons, and forming a gap by being separated from each other; and a roll casing located outside of the couple of rolls and having at least one opening, wherein sealing plates are attached to an inner surface and an outer surface at each opening of the roll casing, respectively, and a sliding tube, both ends of which the sealing plates are fixedly combined with, is closely adhered to a penetrating member penetrating each opening.

2. The apparatus for manufacturing compacted irons of claim 1 , wherein the sealing plates are ring-shaped members.

3. The apparatus for manufacturing compacted irons of claim 1 , wherein a hitching member for fixing is formed on one end of the sliding tube.

4. The apparatus for manufacturing compacted irons of claim 3, wherein a section of the hitching member for fixing is ring-shaped and the outer diameter of the hitching member for fixing is larger than that of the sliding tube.

5. The apparatus for manufacturing compacted irons of claim 3, wherein one sealing plate among the sealing plates is fixed by the hitching member for fixing.

6. The apparatus for manufacturing compacted irons of claim 5, wherein an outer diameter of the hitching member for fixing is larger than an inner diameter of the one sealing plate.

7. The apparatus for manufacturing compacted irons of claim 5, wherein the other sealing plate among the sealing plates is welded to the sliding tube.

8. The apparatus for manufacturing compacted irons of claim 7, wherein the sealing plate welded to the sliding tube is located on an outer surface of the roll casing.

9. The apparatus for manufacturing compacted irons of claim 1 , wherein a distance between the sealing plates is substantially the same as a distance between an inner surface and an outer surface of the roll casing.

10. The apparatus for manufacturing compacted irons of claim 1 , wherein a penetrating surface of the opening is separated from an outer surface of the sliding tube.

11. The apparatus for manufacturing compacted irons of claim 1 , further comprising: a couple of cheek plates installed at both sides of the gap preventing the reduced materials containing fine reduced irons entering into the gap from leaking; and a device for pressing each cheek plate comprising a bar, which is a penetrating member, penetrating the roll casing, and pressing and supporting each cheek plate at an opposite side of the gap, wherein each cheek plate is located between the gap and the bar.

12. The apparatus for manufacturing compacted irons of claim 1 , wherein the couple of rolls are the penetrating members.

13. An apparatus for manufacturing molten irons, comprising: the apparatus for manufacturing compacted irons of claim 1 ; a crusher for crushing compacted irons discharged from the apparatus for manufacturing compacted irons; and a melter-gasifier into which the compacted irons, which are crushed by the crusher, are charged and melted.

14. The apparatus for manufacturing molten irons of claim 13, wherein at least one of the coals selected from the group of lumped coals and coal briquettes are supplied to the melter-gasifier.