KR20070050522A - The steel ingot or carbon steel ingot manufacturing method and manufacturing devices which uses the steel by product - Google Patents

Abstract

The present invention relates to a method and apparatus for manufacturing steel ingots using iron by-products, and more particularly, scales and mill scales generated during the processing of slag and process sludge and steel powder and smelted steel generated in steelmaking and steelmaking processes. And a first sorting step (S1) of removing impurities from iron by-products including charismatic spectroscopy and classifying by particle size. Iron by-product grinding step (S2) for grinding the iron by-products classified by particle size in the first screening step (S1) with an appropriate grinder according to the size; A secondary sorting step (S3) of magnetically sorting so as to obtain an iron powder in which the iron content in the pulverized iron byproduct is maintained at 80% or more; Subsidiary material mixing step (S4) of mixing molasses to the iron powder in the second weight less than 5% of the total weight ratio of the iron powder selected by mixing device; A steel ingot forming step (S5) of forming a steel ingot in which a certain strength is maintained by the steel ingot forming apparatus in which the raw material is mixed; A drying step (S6) of performing annealing heat treatment to maintain a predetermined strength and hardness in the process of discharging the ingot formed to have a predetermined size and weight by the discharge device; The steel ingots can be charged into the furnace during manufacturing and steelmaking.

Iron by-product, steel ingot manufacturing, steel ingot manufacturing apparatus, steel ingot

Description

The steel ingot or carbon steel ingot manufacturing method and manufacturing devices which uses the steel by product}

1 is a process chart according to the manufacturing method of the steel in accordance with the present invention,

Figure 2 is a schematic diagram of the overall configuration of the apparatus for producing steel in accordance with an embodiment of the present invention,

3 is an enlarged view of a portion A of FIG. 2;

Figure 4 is a plan view of the manufacturing apparatus of the steel in accordance with another embodiment of the present invention,

5 is a side configuration diagram of FIG. 4.

※ Brief description of symbols for the main parts of the drawings

5: iron by-product 5a: steel ingot

10: grinding device 12: iron by-product storage hopper

14 Charity Spectrum Storage Hopper 15 Coke Storage Hopper

17: screw conveyor 18: the first mixture storage hopper

20: moving and sorting device 22: vibrating screen

25, 47: mixed screw conveyor 30: bucket elevator

40: mixing device 42: second mixture storage hopper

45 molasses supply device 50: steel ingot molding machine

52, 54: pressing roller 55, 56: steel ingot forming groove

60: steel ingot discharge device 62: mesh conveyor

70: steel ingot drying device 72: drying booth

The present invention relates to a method and apparatus for manufacturing steel ingot using iron by-products, and more particularly, to recover various iron by-products generated in the steelmaking and steelmaking process and processing of steel and pulverized to below a certain particle size Manufacturing method of steel ingot using iron by-products that can be made into steel ingots and loaded into the furnace during steelmaking industry to actively recycle resources, reduce waste disposal costs, prevent environmental pollution and reduce waste of foreign currency due to import of scrap metal Relates to a device.

That is, the present invention recovers iron from iron by-products such as slag, steel powder, scale, etc. generated in the steelmaking and steelmaking process or steel processing process to produce a steel ingot of a certain size. This is a technology for recycling basic materials of steel that can be recycled to iron sources.

In general, iron ore injected into the furnace is reduced to iron by carbon supplied from the coke, and the molten metal reduced to iron is discharged from the furnace to be processed into various steels. In the furnace, the molten metal contains various impurities in addition to the molten metal. Slags that are present are also generated and discharged.

In this way, various iron by-products are also generated in the process of making various steels using smelted iron, including slag generated in the basic process of melting iron ore in a smelter.

That is, in the steelmaking process of making steel of a certain shape and composition using smelted iron, steel powder or hot rolling process generated after oxidized scale on the surface of steel or shot which is a pretreatment of coating. Various iron by-products such as mill scale generated in the back and scale generated during the cutting of steel are produced. The various iron by-products generated due to the low iron content and the composition thereof are inconsistent in terms of use value. In the past, most of them were discarded with little reuse.

In particular, the iron by-products thus discarded have a problem in that the disposal cost is enormous since it is the most contaminating factor in the natural environment. Therefore, there is a problem in that steel and steel mills have to bear huge economic costs when disposing of them. there was.

In addition, due to the disposal of iron by-products, but not a large amount of various metal components contained in the waste was discarded together, so the development of technology to recycle it was a long time.

In particular, Korea, which lacks basic materials, imports and uses enormous scrap iron from around the world every year as a casting and steelmaking material to meet the demand for steel products.

In addition, even when some iron by-products are recovered and used, they are used as they are without any separate processing step, and are mixed with the slag layer, which is an impurity formed in the upper part of the furnace, when they are introduced into the furnace, so that they cannot be recovered as an iron source due to oxidation. It was only slight.

Therefore, the present invention can reduce the economic cost of the various iron by-products of steel and steelmaking companies, prevent environmental pollution and reduce foreign currency waste by recycling resources for iron by-products, and contribute to job creation by developing new technologies. To this end, the company has developed a technology to recycle iron by-products that are disposed of in large quantities every year.

As described above, the present invention was devised for active recycling of iron by-products, which have been extremely poor in the prior art, and the present invention reduces enormous disposal costs and environmental pollution by recycling various iron by-products that have been disposed of, and recycles resources. The aim is to provide a manufacturing method and apparatus for the production of steel ingots using iron by-products that can reduce the economic loss caused by the maximum, and can provide inexpensive materials of insufficient iron source.

In particular, the present invention is to produce a steel ingot using iron by-products that can achieve another purpose to contribute to the industrial development through the protection of resources and employment increase by the development of new technologies using various iron by-products that are conventionally disposed of It is to provide a method and a manufacturing apparatus thereof.

In order to achieve the object of the present invention, the manufacturing method of the steel ingot using the iron by-product according to the present invention is the scale and mill generated in the processing process of slag and process sludge and steel powder and smelted steel generated in the steelmaking and steelmaking process A first sorting step of removing impurities from iron by-products having main components such as scale and magnetic spectroscopy and then classifying them by particle size; Iron by-product grinding step of grinding the iron by-products classified by particle size in the first screening step with an appropriate grinder according to the size of each particle size; A secondary screening step of magnetic screening to obtain an iron powder having an iron content of 80% or more in the pulverized iron byproduct; A subsidiary material mixing step of mixing molasses in an amount of 5% or less of the total weight ratio of the second selected iron powder by an addition mixing device; A steel ingot forming step of forming a steel ingot in which a constant strength is maintained by using a steel ingot molding machine in which iron materials are mixed; A drying step of annealing and heat treatment to maintain a predetermined strength and hardness in the process of discharging the ingot formed to have a predetermined size and weight by the discharge device; It consists of a method of manufacturing a steel ingot manufactured through.

In addition, the steel ingot manufacturing apparatus according to an embodiment of the present invention for achieving the above object is a variety of iron by-products composed of slag and mill scale, charity spectroscopy, steel powder, etc. generated during the steelmaking and steelmaking process Grinding device provided with a rotary blade inside the hopper to crush to a size less than a certain particle size; A moving and sorting device having a vibrating screen vibrating at a constant speed, which is composed of a filtering net so as to filter the iron constituents and impurities while moving the pulverized iron powder discharged from the crushing device at a predetermined distance; Bucket elevator is connected to the end of the transfer and sorting device to supply the iron powder selected by the moving and sorting device to a hopper of a certain height, and molasses or a predetermined amount of molasses to the iron powder supplied by the bucket A mixing device having a mixing storage hopper having a rotatable blade rotatably installed therein for injecting and mixing coke and connected to an end of the moving and sorting device; A steel ingot forming apparatus installed at a lower end of the outlet so as to shape the iron powder discharged from the mixing storage hopper of the mixing apparatus into a steel ingot having a predetermined density and weight; Conveyor of a certain length is provided to discharge the ingot formed by the ingot forming apparatus, and a predetermined heater is provided on the inside to surround the outside of the conveyor is provided to dry the ingot moved along the conveyor It is composed of a configuration including a; and a drying and drying apparatus.

On the other hand, a detailed description of the present invention and the description of the apparatus for producing ingots according to another embodiment will be described in detail below.

The present invention is produced in the steelmaking and steelmaking process, that is, the steel by-products generated in the steel manufacturing process or processing process, the steel powder (shot) generated after the shot (shot) pre-painting, hot rolling process Mill scale, scale generated during the cutting of steel materials, slag generated during the steel manufacturing process, and charity spectroscopy composed of steel chips that are magnetically selected by crushing slag. A method of manufacturing a steel ingot (hereinafter, referred to as 'steel ingot') having a predetermined size and weight by recovering iron from iron by-products mainly composed of steel powder collected in a dust collector; The present invention relates to an apparatus for manufacturing steel ingots for recycling iron by-products which enables recycling of iron by-products while reducing the amount of iron by-products that have been disposed of in the past. to be.

A preferred embodiment of the method and apparatus for manufacturing a steel ingot using iron by-products according to the present invention will be described in more detail with reference to the accompanying drawings.

Ingot manufacturing method

1 shows a process for manufacturing a steel ingot using iron by-products according to the present invention, as shown in the drawings, iron by-products required for the production of steel ingots (Steel Ingot), as described above, steel and First sorting by sorting by particle size after removing various impurities and collecting various scales, slag, steel dust, etc. generated in the manufacturing and processing processes of steel making in steel mills and steel mills Step S1 is performed.

Since the iron by-products passed through the primary screening step (S1) vary in size and particle size, a fine grinding operation for finely grinding iron by-products is performed using an appropriate grinding device suitable for each particle size (S2). As the iron by-products are pulverized into fine particles, the iron recovery rate is higher, but the loss is also increased and the cost competitiveness is lowered compared to the processing cost. Therefore, it is preferable to grind the particle to be crushed to maintain a size of about 8 mm.

The iron by-products crushed to a certain particle size through a predetermined grinding device are separated into the foreign matter as much as possible from the iron powder through a predetermined screening device composed of a screen net, so that the iron content is maintained at least 80%. Rough

Secondary iron powder selected is fine because of its fine particle size, which is mixed with the impurity layer formed in the upper part of the furnace when it is introduced into the furnace and cannot be recovered at all as an iron source. It is preferable to supply the crushed iron powder as a steel ingot (Steel Ingot) having a certain size and weight having a certain size, in the present invention is a constant size that can be precipitated to the bottom of the furnace In order to form an ingot of about 100 × 100 mm or 50 × 50 mm, a subsidiary material mixing step (S4) of adding molasses or silicate as a predetermined amount of caking additive to the iron powder is performed.

The molasses added as a subsidiary material is expensive, and if it is mixed a lot, the iron content is lowered, and if it is mixed less, the initial strength is lowered. If the mixing time is too long, molasses will evaporate due to self-heating, so it is necessary to adjust the mixing time appropriately.

After sufficiently mixing the iron powder and the subsidiary material, the iron powder is discharged by the ingot forming apparatus, and the powdered iron mixture is compression molded into a steel ingot having a constant density and strength to produce a steel ingot (S5), or to carry the produced ingot or It is dried to maintain a certain strength through an annealing process, which is a predetermined heat treatment process, in the process of discharging the formed ingot in order to prevent breakage during the injection into the furnace and to remove moisture contained therein. (S6), and then through natural drying to form a steel ingot having a certain strength and hardness.

On the other hand, in the mixing process (S4) of mixing the raw material in the iron powder during the process, including the coke supply step (S7) for additionally supplying a predetermined amount of coke can be ingot forming, such a steel ingot forming By controlling the carbon content of the raw material to reduce the feed process of coke, carbon and pig iron, such as coke, carbon and pig iron, which is added to control the amount of carbon controlled according to the product produced during steelmaking industry, The coke supplied to (S4) is introduced into the molten powder before being added to the molten powder in the undifferentiated state before the molasses and sufficient agitation so that the coke absorbs the molasses in the raw material mixing process so that the molasses is not evenly applied to the iron powder. To prevent it.

Steel Ingot Manufacturing Equipment

Hereinafter, the ingot manufacturing apparatus according to the present invention will be described in detail with reference to the accompanying drawings.

Example

Figure 2 schematically shows the state of use of the overall configuration for the apparatus for producing steel ingot using iron by-product according to an embodiment of the present invention.

First, the apparatus for manufacturing ingots according to an embodiment of the present invention is a slag or mill scale, charity spectroscopy, steel powder, etc. containing iron used as a raw material in a state in which foreign substances are removed. Crushing apparatus 10 for making the particle size or less is provided.

The grinding device 10 may be provided with a variety of devices according to the particle size of the selected iron by-products, in the present invention is provided with an iron by-product storage hopper 12 at a certain height, the iron by-product storage hopper Inside the 12, a screw-type rotating blade rotating at a constant speed by externally supplied power is horizontally installed at the bottom of the hopper so that the iron by-product injected into the iron by-product storage hopper 12 is uniformly crushed. A screw mill configured to be made is used.

The iron by-products crushed uniformly in the grinding device 10 are dropped and moved to a moving and sorting device 20 composed of a vibrating screen 22 horizontally installed at the bottom of the storage hopper 12, and the vibrating screen 22 is If the iron powder supplied from the crusher 10 is not crushed or contains impurities, it is composed of a mesh of a certain mesh to filter it is configured to maintain a constant vibration state.

The iron powder discharged through the moving and sorting device 20 is supplied to the mixing device 40 into which the binder or the coke is added and mixed to form a steel ingot or a carbon steel ingot.

The mixing device 40 is the first mixture storage hopper 18 and the first mixture storage hopper 18 which is installed at a predetermined height so as to easily mix the molasses and the coke, the iron powder and the binder, the movement and selection The bucket elevator 30 is installed at a predetermined height near the end of the moving and sorting device 20 so as to supply the selected iron powder from the apparatus 20, and the iron powder supplied by the bucket elevator 30 is A discharge port is provided at the bottom to be evenly mixed and discharged with molasses or coke additionally added, and at the end of the discharge port there is a feeding screw therein to uniformly supply the discharged iron mixture to the ingot forming apparatus 50 installed at the bottom. A second mixture storage hopper 42 having a feeding screw 41 is provided, and a roller-type ingot forming apparatus 50 is provided at a lower end of the second mixture storage hopper 42.

The steel ingot or carbon steel ingot discharged from the ingot forming apparatus 50 is discharged through the discharge device 60 provided with the conveyor 62, and the steel ingot or carbon is discharged from the conveyor 62 of the discharge device 60. After the steel ingot is molded, a drying apparatus 70 is further provided to dry the steel ingot so that proper strength and hardness can be maintained. The drying apparatus 70 is seated on the upper surface of the conveyor 62 and moved. It consists of a drying booth 72 provided with an electric oven or an electric heater in a structure surrounding the conveyor 62 so as to evenly dry steel or carbon steel ingots.

On the other hand, the ingot forming apparatus 50 is installed in the lower end of the mixing device 40 to receive a pressurized iron powder at a certain density to produce a fixed ingot, the compression roller 52 made of a pair (54) ) Is installed to maintain a state in close contact with a constant pressing force, and the iron powder (iron mixture) dropped between the pair of the compacting rollers 52, 54 is introduced into the crimping both sides with the rotation of the compacting rollers The outer circumferences of the pressing rollers 52 and 54 are formed in a predetermined size and shape by the pressing force of the rollers, and the outer peripheries of the pressing rollers 52 and 54 have a plurality of predetermined depths so as to coincide with each other during rotation. It is made of a structure in which the ingot forming grooves 55 and 56 are formed, and part of the enlarged view is illustrated in FIG. 3 so that the pressing rollers 52 and 54 can be easily seen.

When the iron powder introduced into the ingot forming apparatus 50 is supplied from the second mixed storage hopper 42, the ingot formed by being supplied with a predetermined pressing force by a feeding screw 41 installed inside the hopper is formed with a constant density and By having a specific gravity is configured to obtain a stable quality of steel and carbon steel ingot, the drawing showing a configuration according to an embodiment of the present invention described above molasses and coke feed hopper and its supply device is the first mixing Since it should be installed on one side of the storage hopper 18, a detailed description and drawings thereof are omitted.

Another embodiment

On the other hand, Figure 4 and Figure 5 shows another embodiment of the steel ingot manufacturing apparatus according to the invention, Figure 4 shows the configuration of the entire apparatus in a plan view, Figure 5 is a cross-sectional view of the side state of the entire configuration As shown.

As shown in the figure, the iron powder and the coke are supplied through the screw conveyor 17 from the plurality of charity spectroscopy storage hopper 14 and the coke storage hopper 15 in which predetermined cokes are stored. A first mixed storage hopper 18 having spectroscopy and coke mixed thereon is provided, and the first mixed storage hopper 18 is moved to a predetermined distance while mixing iron powder and coke introduced from the first mixed storage hopper 18. The mixing screw conveyor 25 is formed at the bottom.

In addition, the bucket elevator 30 is continuously installed at the end of the mixing screw conveyor 25, the bucket elevator 30 is installed vertically to move a certain height to receive the iron powder supplied from the mixing screw conveyor 25, in the bucket elevator (30) A second mixed storage hopper 42 is provided at the front of the upper end of the bucket elevator 30 to temporarily store the supplied iron powder, and one side of the second mixed storage hopper 44 has a predetermined amount of molasses to the iron powder supplied. Molasses feeding device 45 is installed to supply.

In addition, the mixing screw conveyor at the lower end of the second mixed storage hopper 42 to move a predetermined distance while remixing the molten iron supplied from the second mixed storage hopper 42 and the molasses supplied from the molasses supply device 45. (47) is installed, the ingot forming apparatus 50 is provided with a press to press the iron powder supplied from the mixing screw conveyor 47 is injected into the mold in a predetermined shape in the end of the mixing screw conveyor 47 (50) ) Is installed, the ingot discharge device 60 is installed to one side of the ingot forming apparatus 50 to discharge the formed ingot from the pressure press.

The ingot discharge device 60 is a mesh conveyor 62 composed of a predetermined width and length, and the outside of the mesh conveyor 62 to dry the formed ingot moved along the mesh conveyor 62. In order to wrap the mesh conveyor 62 in order to form a steel ingot drying apparatus 70 having a drying booth 72 is provided with a predetermined heater in a tunnel structure.

The apparatus for manufacturing a steel ingot according to the present invention having the above-described configuration is provided with a predetermined power driving means, a connecting means, a control means, etc. for each device. It will be omitted in the present invention.

On the other hand, by using the method of manufacturing the steel ingot using the iron by-product according to the present invention and the apparatus for manufacturing the same, various scales, steel powder, charity spectroscopy, etc. generated in the steelmaking and steelmaking process are collected and recycled to Cheorwon. It is possible to prevent the environmental pollution that could be caused by landfilling and discarding a large amount of iron byproducts every year, and to reduce the enormous economic burden of landfilling, and enormous waste of foreign currency through recycling of resources that can secure basic materials of steelmaking. It provides an advantage that can reduce.

That is, the steel ingot formed by the manufacturing method and manufacturing apparatus of the steel ingot using the iron by-product according to the present invention is supplied to the steel making plant is used for steel making, cast steel and casting, the conventional steel making factory produces a variety of products In order to control the carbon content of the product to be produced by inputting coke, pig iron, and coal into the furnace, a certain steel product is manufactured. In general, pig iron is excellent in terms of recovery rate and operation rate, but its cost is very high. There is a disadvantage, in the case of using inexpensive coal, the injection method is used to infiltrate the inside of the furnace due to the low recovery rate when supplied to the upper part of the furnace. By using the manufactured steel ingot into the melting furnace, it is not only possible to use for pig iron replacement, It can also play a role as a function to shorten the process of the steelmaking industry to provide an advantage in improving the production of steelmaking, shortening the working time and improving the working environment.

In particular, foreign currency expenditures associated with the import of pig iron and scrap for steelmaking, which are totally dependent on imports, are prevented by recycling steel ingots obtained through the recovery of iron using iron by-products according to the present invention, and through recycling of basic materials. The development of new sectors of industrial technology provides useful benefits that can increase employment and improve the competitiveness of manufacturers.

As described above, the method of manufacturing the steel ingot using the iron by-products and the manufacturing apparatus thereof according to the present invention can solve the conventional problems that severely damaged the natural environment by being discarded and not recycled, and at the same time, recycling the steel through the recycling of resources. Cost reduction of materials can improve competitiveness, and new technology development provides useful effects to increase employment and reduce foreign currency expenditure.

Claims (7)

The first step of removing impurities from iron by-products, which are the main components of scale, mill scale, and charity spectroscopy, which are produced in the processing of slag, process sludge, steel powder, and smelted steel. Selection step; Iron by-product grinding step of grinding the iron by-products classified by particle size in the first screening step with an appropriate grinder according to the size of each particle size; A secondary screening step of magnetic screening to obtain an iron powder having an iron content of 80% or more in the pulverized iron byproduct; A subsidiary material mixing step of mixing molasses in an amount of 5% or less of the total weight ratio of the second selected iron powder by an addition mixing device; A steel ingot forming step of forming a steel ingot in which a constant strength is maintained by using a steel ingot molding machine in which iron materials are mixed; A drying step of annealing and heat treatment to maintain a predetermined strength and hardness in the process of discharging the ingot formed to have a predetermined size and weight by the discharge device; Method of manufacturing ingot using iron by-products prepared through. The method of claim 1, The molasses added to the subsidiary material mixing step is a method for producing ingot using iron by-products, characterized in that water and molasses are diluted in a ratio of 7: 3. The method of claim 1, The subsidiary material mixing step includes a coke input process in which a predetermined amount of coke is added, but fraudulent coke is micronized before input and then added after stirring and mixing with molasses. Grinding apparatus equipped with a rotary blade inside the hopper to crush the iron by-products composed of slag and mill scale, charity spectroscopy, steel powder, etc. generated in the steelmaking and steelmaking process and the processing to a size less than a certain particle size; A moving and sorting device having a vibrating screen vibrating at a constant speed, which is composed of a filtering net so as to filter the iron constituents and impurities while moving the pulverized iron powder discharged from the crushing device at a predetermined distance; The bucket elevator is connected to the end of the moving and sorting device so that the iron powder sorted by the moving and sorting device can be supplied to the hopper of a predetermined height, and the molasses or the like as a submaterial to the iron powder supplied by the bucket elevator. A mixing device having a mixing storage hopper having a rotatable blade rotatably installed therein for injecting and mixing coke and connected to an end of the moving and sorting device; A steel ingot forming apparatus installed at a lower end of the outlet to form a steel ingot having a predetermined density and weight of the iron powder discharged from the outlet of the mixing apparatus; Conveyor of a certain length is provided to discharge the ingot formed by the ingot forming apparatus, and a predetermined heater is provided on the inside to surround the outside of the conveyor is provided to dry the ingot moved along the conveyor Apparatus for producing steel ingots using iron by-products, characterized in that comprising a discharge and drying device. The method of claim 4, wherein The ingot forming apparatus is composed of a plurality of pressing rollers are formed in pairs to be rotated in close contact with each other at a predetermined pressing force, the pressing rollers installed in a mutually opposite structure is passed between the pressing rollers rotated iron powder dropped from the top At the same time, the outer circumferences of the pressing rollers on both sides are formed so that a plurality of ingot forming grooves are formed at a predetermined depth so as to form a single ingot at the outer periphery of both compression rollers so as to form and discharge a certain ingot. Manufacturing equipment. The method according to claim 4 or 5, The inside of the mixing storage hopper of the mixing device is installed with a fitting screw for discharging the iron powder discharged to the ingot forming apparatus at a predetermined pressing force to enable the ingot forming having the required density and specific gravity. Manufacturing apparatus of ingots. A first mixed storage hopper which receives iron powder and coke from the coke storage hopper in which the selected charity spectroscopy is stored and the coke storage hopper in which the predetermined coke is stored through a screw conveyor; A screw conveyor continuously installed at a lower end of the first mixed storage hopper to move the iron powder mixed in the first mixed storage hopper by a predetermined distance; A bucket elevator which is continuously installed at the end of the screw conveyor and installed vertically to receive the iron powder supplied from the screw conveyor and move at a predetermined height; A molasses supply device provided at one side of the second mixed storage hopper so as to supply a predetermined amount of molasses to the iron powder supplied by being connected to one side of the second mixed storage hopper for temporarily storing the iron powder supplied from the bucket elevator; A mixing screw conveyor installed at a lower end of the second mixing storage hopper and installed to move a predetermined distance while remixing the iron powder supplied from the second mixing storage hopper and the molasses supplied from the molasses supply device; A steel ingot forming apparatus provided at a distal end of the mixed screw conveyor and having a pressurized press in which iron powder supplied from the mixed screw conveyor is introduced into a mold to form a steel ingot of a predetermined shape; In order to dry the formed ingot that is installed along the mesh conveyor is installed in a structure surrounding the outside of the mesh conveyor and the mesh conveyor is installed in a predetermined width and length so as to discharge the formed ingot from the pressure press. Apparatus for manufacturing steel ingots using iron by-products, characterized in that the configuration comprising a; discharge and drying apparatus provided with a drying booth is provided with a predetermined heater therein.

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