KR100726208B1 - 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 manufacturing method and apparatus for manufacturing pig iron ingots using iron by-products, and more particularly, scales generated during the processing of slag, process sludge and steel powder and smelted steel generated in steelmaking and steelmaking processes. A primary sorting step (S1) of removing impurities from iron by-products having main components such as mill scale and charity spectroscopy, and classifying them 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) in which molasses and water are added in an additive ratio of 7: 3 to a total weight ratio of the secondary fractionally selected iron powder at 7: 3, and an additional amount of finely divided coke is added and mixed by the mixing apparatus (S4). ; 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, hardness, and quality in the process of discharging the ingot formed to have a predetermined size and weight by the discharge device; It provides a method and apparatus for the manufacture of steel ingots.

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: pig iron 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 ingot for iron using iron by-products, and more particularly, after recovering various iron by-products generated in the steelmaking and steelmaking process and the processing of steel, after grinding to a certain particle size or less Production of steel ingots using iron by-products that can be made into steel ingots and loaded into the furnace during steelmaking to proactively recycle resources, reduce waste disposal costs, prevent environmental pollution, and reduce waste of foreign currency due to scrap metal imports. It relates to a method and a manufacturing apparatus thereof.

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 (iron) that is reduced to iron is discharged from the furnace and processed into various steels. Slags included 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 purpose of the present invention is to provide a manufacturing method and apparatus for producing ingots for iron using iron by-products that can reduce economic losses due to the maximum cost and provide inexpensive materials of insufficient iron source.

In particular, the present invention is ingot for pig iron using iron by-products that can achieve another purpose to contribute to 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 manufacturing method and a manufacturing apparatus thereof.

In order to achieve the object of the present invention, the method for producing pig iron ingot using the iron by-product according to the present invention is a scale 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 scales of wheat scale and charity 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 adding an additive in which molasses and water are mixed at a ratio of 7: 3 to 5% or less of the total weight ratio of the second selected iron powder, and further adding a finely divided amount of coke to be mixed by a mixing apparatus; A steel ingot forming step of forming a steel ingot so that a constant strength of the iron powder mixed with the submaterial is maintained by a steel ingot molding machine; A drying step of annealing and heat treatment to maintain a predetermined strength, hardness, and quality in the process of discharging the ingot formed to have a predetermined size and weight by the discharge device; It is made by the method produced through.

In addition, the apparatus for producing pig iron ingot 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 in the steelmaking and steelmaking process and the processing process The grinding device is provided with a rotary blade inside the hopper in order to be crushed to a size of a predetermined particle size or less; 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 to supply the iron powder sorted by the moving and sorting device to a hopper of a predetermined height, and a certain amount of the input amount as a subsidiary material to the iron powder supplied by the bucket elevator The first mixed storage hopper having a rotary blade rotatably installed therein to mix the molasses and the coke, and the steel ingot is formed by being discharged and formed under a constant pressing force when iron powder is supplied from the first mixed storage hopper. A mixing device connected to an end of the moving and sorting device, including a second mixing storage hopper having a feeding screw therein to have a specific gravity; The steel powder discharged from the discharge port of the mixing device is formed in the outer periphery so as to form a plurality of steel ingots formed in the outer periphery so as to form a steel ingot of a certain density and weight installed at the bottom of the discharge port Ingot forming apparatus for pig iron; A discharge and drying apparatus for drying the ingot for iron which is discharged and composed of a mesh conveyor for discharging and moving the ingot formed by the ingot forming apparatus for the pig iron, and having a predetermined heater inside to surround the outside of the mesh conveyor; It consists of a configuration comprising a.

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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. The steel ingot, which is mainly composed of steel powder collected from the dust collector, recovers the iron component and adds molasses and coke to add a molten steel and a coke to produce a steel ingot having a certain size and weight. Recycling of iron by-products that allows recycling of iron by-products while reducing the amount of iron by-products that have been disposed of in the past It relates to an apparatus for manufacturing a steel ingot for pig iron for.

Preferred embodiments of the method and apparatus for producing ingot for iron using iron by-products according to the present invention will be described in more detail with reference to the accompanying drawings.

Ingot manufacturing method

Figure 1 shows a process for producing ingots for pig iron using iron by-products according to the present invention, as shown in the drawings, the iron by-products required for the production of carbon steel ingot (Carbon Steel Ingot) as described above Similarly, various scales, slags, steel dust, etc. generated in the manufacturing and processing processes of steel and steel are collected at steel mills and steel mills to remove predetermined impurities, and then classified by particle size. To perform the first sorting step (S1).

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 includes a coke supply step (S7) for additionally supplying a predetermined amount of coke can form a steel ingot for pig iron, Forming the ingot is to reduce the carbon supply process of coke, carbon and pig iron, which are subsidiary materials input for controlling the amount of carbon controlled according to the product produced during steelmaking by controlling the carbon content. The coke supplied to the subsidiary material mixing process (S4) is introduced into the molten powder in the form of molasses before being added into the molten powder, and then sufficiently mixed with the molasses. Prevent it from being applied.

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 pig iron ingot using the 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 for a pig iron is provided at a lower end of the second mixture storage hopper 42.

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

On the other hand, the steel ingot forming apparatus 50 is installed on the lower end of the mixing device 40 to receive a pressurized iron powder to a certain density to produce a constant ingot, a roller compacted in pairs 52 ( 54) are installed to maintain a state in close contact with a constant pressing force, the iron powder (iron mixture) dropped between the pair of the compacting rollers 52, 54 is introduced into 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 pressing roller, and the plurality of having a predetermined depth so as to form one steel ingot in rotation. It is made of a structure in which the two ingot forming grooves 55 and 56 are formed, and part of the enlarged view is illustrated in FIG. 3 so as to easily recognize the pressing rollers 52 and 54.

The iron powder introduced into the steel ingot forming apparatus 50 is supplied in a state in which the steel powder is supplied and formed under a constant pressing force by a feeding screw 41 installed inside the hopper when the second mixed storage hopper 42 is supplied. It is configured to obtain a stable quality of the steel and carbon steel ingot by having a density and specific gravity, the drawing showing the configuration according to an embodiment of the present invention described above molasses and coke feed hopper and its supply device 1 mixed storage hopper 18 may be installed on one side, so 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 pig steel ingot discharging device 60 is installed to one side of the pig iron ingot forming apparatus 50 to discharge the cast iron ingot formed in the pressure press.

The pig iron ingot discharge device 60 is a mesh conveyor 62 having a predetermined width and length, and a molded ingot that is moved along the mesh conveyor 62 to the outside of the mesh conveyor 62. The steel ingot drying device 70 having a drying booth 72 provided with a predetermined heater is installed in a tunnel structure that can wrap the mesh conveyor 62 to dry.

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 iron ingot using the iron by-product according to the present invention and a manufacturing apparatus thereof, various scales, steel powder, charity spectroscopy, etc. generated in the steelmaking and steelmaking process are collected to the iron source (鐵 原) By recycling, we prevent the environmental pollution that could be caused by landfilling and discarding a large amount of iron by-products every year, while reducing the enormous economic burden of landfilling, and enormously by recycling resources that can secure the basic materials of steelmaking. It provides the advantage of reducing foreign currency waste.

That is, the carbon steel ingot formed by the manufacturing method and manufacturing apparatus for pig iron ingot using the iron by-product according to the present invention described above is supplied to a steel making factory and used for steel making, casting steel and casting, Coke, pig iron, and coal are added to the furnace to produce a product, and the carbon content of the product to be produced is controlled to produce a constant steel product. In general, pig iron is excellent in terms of recovery rate and operation rate. In the case of using cheap 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 melting furnace. The carbon steel ingot manufactured according to the invention can be used as a substitute for pig iron by adding it to a melting furnace. Not been able to play a role even gatan zero to provide an advantageous increase in the production and work time and working environment improvement of steel by providing an effect of shortening the process of the steel making operation.

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 for manufacturing pig iron ingot using the iron by-product according to the present invention and the manufacturing apparatus thereof are not recycled and can be disposed of to solve the conventional problems that severely damaged the natural environment and at the same time recycle the resources. Through this, the cost reduction of steel 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. Screening step (S1); Iron by-product grinding step (S2) for 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 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) in which molasses and water are added in an additive ratio of 7: 3 to a total weight ratio of the secondary fractionally selected iron powder at 7: 3, and an additional amount of finely divided coke is added and mixed by the mixing apparatus (S4). ; Ingot ingot forming step (S5) of the iron powder mixed with the subsidiary material to make a ingot for iron in which a constant strength is maintained by the ingot forming machine (S5); A drying step (S6) of performing annealing heat treatment to maintain a predetermined strength, hardness, and quality in the process of discharging the ingot formed to have a predetermined size and weight by the discharge device; Method for producing ingots for pig iron using iron by-products prepared through. delete delete Grinding device equipped with a rotating blade inside the hopper for crushing the iron by-products composed of slag, mill scale, charity spectroscopy, steel powder, etc. generated in the steelmaking and steelmaking process, and the size below a certain particle size. 10); The moving and sorting device which is connected to the end of the grinding device is provided with a vibrating screen vibrating at a constant speed consisting of a filtering net to filter the iron constituents and impurities while moving the iron powder crushed and discharged by a predetermined distance ( 20); In order to supply the iron powder sorted by the moving and sorting device to the hopper of a certain height, the bucket elevator 30 is connected to the end of the moving and sorting device, and the iron powder supplied by the bucket elevator 30 The mixing storage hopper having a rotary blade installed therein rotatably to mix a predetermined amount of molasses and coke introduced as a subsidiary material, and the density and specific gravity required for steel ingots formed by ejecting iron powder by applying a constant pressure from the mixing storage hopper. Feeding screw 41 is installed inside the hopper to have a mixing device 40 is installed connected to the end of the moving and sorting device; The steel powder discharged from the discharge port of the mixing device is composed of a plurality of compression rollers 52, 54 formed with a plurality of ingot forming grooves 55, 56 on the outer periphery so as to form a steel ingot having a certain density and weight. A steel ingot forming apparatus 50 installed at a lower end of the outlet; A mesh conveyor for discharging and moving the ingot formed by the ingot forming apparatus 50 for pig iron, and a predetermined heater is provided inside to cover the outside of the mesh conveyor to dry the ingot discharged along the mesh conveyor. Discharge and drying apparatus (60) (70); manufacturing apparatus for pig iron ingot using iron by-products, characterized in that comprising a. delete delete delete

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