WO2016006743A1

WO2016006743A1 - Method for refining and recovering metal iron from base metal

Info

Publication number: WO2016006743A1
Application number: PCT/KR2014/006277
Authority: WO
Inventors: 김부환
Original assignee: 주식회사 미창
Priority date: 2014-07-11
Filing date: 2014-07-11
Publication date: 2016-01-14
Also published as: CN107075609B; CN107075609A

Abstract

The present invention relates to a method for refining and recovering metal iron from base metal and, more particularly, to a method for refining and recovering metal iron from base metal, comprising: conducting a primary refining for cutting, boring or punching base metal, in which slag and metal iron are present together during an iron manufacturing process, to reduce the size of the base metal to a pulverizable size having a diameter of 300mm; pulverizing the primarily refined base metal; separating and sorting the base metal according to the size of the primarily refined base metal; conducting a secondary refining through shot-peening treatment; and sorting and separating the particle sizes of the secondarily refined base metal so that when the base metal has a size of 1-300mm, the metal iron (MT Fe) content is 90 wt.% or more. The present invention processes, at a constant size, base metal which contains a large amount of metal iron but is difficult to be pulverized through a general pulverizing or cutting process due to the large size, refines the processed base metal such that the metal iron content is at least 90% on the basis of the total weight of the base metal, thereby providing base metal which can be utilized as a substitute material of pig iron. Accordingly, waste resources are recycled and, simultaneously, though encouraging an import substitution effect for pig iron, of which the total amount is imported from foreign countries, production costs for iron manufacturing can be reduced.

Description

Purification and recovery method of metal iron from now on

The present invention relates to a method for recovering metal iron from now on. Specifically, the steel slag and metal iron together are cut or drilled and punched in the steelmaking process to reduce the present size to 300 mm in diameter. After primary purification, it is crushed and then separated according to the size of the first refined, and then short-processed to perform secondary purification, and then the particle size is separated again. It relates to a method for purifying and recovering metal iron from now on so that the content of MT Fe) is 90% by weight or more.

Slag is an essential by-product of the steelmaking process. Blast furnace slag occurs in the process of obtaining pig iron from raw iron ore. Blast furnace slag is a residue that is obtained by putting iron ore, coke, limestone, etc. in a blast furnace and burning coke to heat / reduce iron ore. The blast furnace slag is mostly recycled for civil engineering barasu, silicon-kal fertilizer, and the like.

The converter slag is leftover from the molten steel obtained by oxidizing carbon, silicon, phosphorus, etc. in the atmosphere of an oxidizing gas in a converter. Slag generated from converter steelmaking is generating more than 4 million tons per year in Korea alone. While blast furnace slag is mostly recycled, converter slag containing many special components (e.g., heavy metals) is not recycled but is disposed of by landfilling, which is also harmful to the environment. Since it is classified as a substance, a safe method for treating waste slag has been requested. On the other hand, converter slag contains a large amount of metal iron (usually 15-25% of the slag amount), so the iron recovery work must be accompanied.

As a technique for separating and recovering the metal iron component contained in the present, there is a method of lifting up an iron ball to a certain height by a crane, dropping it on the ground and then impacting and crushing it. In another conventional recovery method, there is a method of separating the now through the high-pressure gas cutting method using LPG gas and oxygen that is not crushed.

However, in the above-described prior art method for recovering metal iron, the iron ball is dropped to the present and physically impacted, so that the method generates a large amount of scattering dust containing heavy metals harmful to the human body at the moment when the iron ball is impacted. Not only do not fall out and cause environmental pollution, but now is not broken to a certain size, but now it is hard itself had a problem that must drop a few times repeatedly. In addition, the method of breaking the current through high-pressure gas cutting, which is another conventional technology, is not only expensive because of high consumption of oxygen and LPG during work, but also releases a large amount of heavy metals that are harmful to the human body, which is now released into the air, causing serious adverse effects on workers. The problem remains that there is a risk of explosion during operation. In addition, since the high pressure gas cutting itself is difficult, there was a problem that the work efficiency of the worker is also significantly reduced.

In order to solve the above problems, in Korean Patent Registration No. 0901989, the non-fixed slag and the high Fe slag are heated by using the present sensible heat to increase the metal recovery rate included in the present, and heat transfer of the ingot contained in the slag. By quenching after heating by using the difference between coefficient and heat transfer coefficient of slag, non-settled slag and high Fe slag are thermally shocked to cause cracks inside, and if cracks exist inside Since it can easily occur, a method of separately recovering only metal metal iron is proposed by crushing slag, which is difficult to fracture due to its small size and roundness, but it is easy to generate cracks in large non-adhesive slag only by the difference in thermal expansion coefficient. Not only are they broken, Issues that need sorting now separated only size suitable for back Crushers not constant, the size was still there.

The present invention has been made in order to solve the above problems, the present invention contains a large amount of iron, but the size is large, so that it is difficult to crush through a general crushing process or cutting process directly to a constant size using a cutter After cutting or punching using a punching drill machine, punching and cutting to reduce the size so that the current diameter is up to 300mm, and then crushing it again using a crusher, and then short tableting to make secondary tablets and then remove the particle size. It is an object of the present invention to provide a method for refining and recovering ferrous iron from now on, which can be used as a substitute for pig iron by processing the metal iron content of 1 to 300 mm in size to 90% by weight or more.

In addition, the present invention is to cut the present to a certain size through direct cutting or perforation and then to screen the present size through physical screening to refine only the present size of a certain size containing a large amount of metal iron to separate recovery It is eco-friendly because no scattering dust is generated in crushing now, and it does not use much electric power for cutting, drilling, and perforating, which can reduce the overall process cost. There is another purpose.

In particular, the present invention is to adjust the height in response to the steel mill now of various sizes generated in the steelmaking process by applying a drill device for drilling to a certain depth in order to easily fracture the steel mill in the now pre-treatment step for recycling steel mill now The purpose is to support the drilling work effectively.

In addition, an object of the present invention is to include a drill tip having a characteristic optimized for drilling a steelmaking now made of various materials such as slag and steel, and has an object of supporting the drilling operation more efficiently.

From now on, according to the present invention,

Now pre-treatment step of reducing the present to a certain size by cutting the now or by drilling and perforating; Shredding step of shredding the now through the now pre-processing step to a predetermined size; A first particle size separation step of separating and separating the now undergoing the shredding step into a predetermined size; A short purification step of purifying by short-processing the now undergoing primary particle size separation; And a second particle size separation step of separating and sorting the now passed through the short purification step by a predetermined size.

At this time, the drilling is now carried out in the pre-processing step using a drill machine, the drilling is preferably carried out using a breaker. First, make a hole by using a drill and a drill machine specially made on the body of the present body, and then drill the perforated part using a breaker and put it in a crusher. It is a step of breaking small.

Therefore, the cutting operation can be performed only if the cutting can be processed to the size of 300mm or less now, only the drilling and drilling operations can be carried out only if the drilling and drilling can be easily processed to 300mm or less.

Of course, if necessary, the above two processes may be performed together.

Nowadays, since the hard metal iron and slag are mixed, it is hard to cut with a conventional cutting machine.

Therefore, it is preferable to use a cutting system for cutting now, which is specially manufactured using diamond tips, which is performed at this stage. In addition, the drilling performed in this step is also preferably carried out using a specially manufactured drill drilling machine in the case of direct drilling in the body now contains a large amount of strong metal iron. Since the perforations can be broken by applying a breaker using a breaker and can be separated into a size of 300 mm or less even today, which is about 2 mm large.

At this time, in the shredding step, the size of the shredded now is 0.01 ~ 300mm. It is advisable to use a rod mill.

On the other hand, in the first particle size separation step, the separation is now separated by the size of 0.01 ~ 20mm, 20 ~ 300mm, and in the second particle size separation step is to be separated by screening the size of 0.01 ~ 1mm, 1 ~ 300mm desirable. In addition, the first particle size separation step and the second particle size separation step is preferably carried out through the screening using a screen device.

In addition, the method of recovering the metal iron from the present invention according to the present invention, the non-reclaimed slag recovery to recover only the non-adhesive slag having a size of 0.01 ~ 20mm in the now or slag screened and separated after the primary particle size separation step Steps are further characterized. The non-slag slag recovery step is a step for collecting and recovering only the non-slag slag that can be used as a material used when manufacturing the raft block.

At this time, the non-adhesive slag recovery step, the recovered slag crushing step of grinding the now and the slag having a size of 0.01 ~ 20mm in the now or slag selected and separated in the primary particle size separation step; And a magnetic separation step of separating and recovering only the non-adhered slag having a size of 0.01 to 20 mm by using the magnetic separator to recover the recovered now and slag crushed through the recovery slag grinding step. In this case, the recovery slag grinding step is preferably carried out using a ball mill.

According to the method for recovering tablets according to the present invention, since the content of the metal iron contained in the size of 1 to 300 mm now occupies 90% or more of the total weight of the present invention, it can be used as a substitute for pig iron, which depends on the total amount of imports. It can bring about the substitution effect of pig iron and reduce the cost of steelmaking.

In particular, according to the present invention the recovery method of the present invention is characterized in that the content of sulfur or phosphorus, which is a factor that is difficult to use now as iron, is significantly reduced, so that it can be sufficiently utilized as an alternative to pig iron. .

The present invention contains a large amount of metal iron, but the size is large, so that it is difficult to crush through the general crushing process or cutting process after processing to a certain size so that the content of the metal iron to 90% or more of the total weight of the present At the same time, by reducing the content of sulfur and phosphorus contained in the present, it can be used as a substitute for pig iron, thereby recycling waste resources and inducing import substitution effects of pig iron, thereby reducing production costs during steelmaking. There is this.

In addition, the present invention is eco-friendly because the scattering dust containing a large amount of heavy metals harmful to the human body does not occur in the step of refining the present, and the overall process cost is reduced by not using much power in the process of reducing the size of the present There is another advantage of being economical.

In addition, the present invention by adjusting the drill tip detachable from the drill device applied in the now pre-processing step can be adjusted to the operating height of the drill tip corresponding to the size even when the steel mill now produced and supplied in various sizes in the steelmaking process And there is an advantage that can easily adjust the size and depth of the drilling hole.

In addition, the present invention has another advantage that can be drilled efficiently and economically by using a drill tip optimized for the work of drilling steelmaking now in which various materials such as slag and steel are mixed.

Meanwhile, the present invention can reintroduce various effective materials such as recovered steel into the steelmaking process, which can reduce the production cost of steelmaking and shorten the time required for the work process for crushing and recycling steelmaking now. It also has another advantage of being very efficient and economical because it can reduce the amount of power consumed.

Fig. 1 shows the whole process of the method for recovering the purification of iron from now on according to the present invention.

Fig. 2 is a front view of a steelmaking now drilling apparatus used in the now pretreatment step in the method for recovering metal iron tablet from the present invention.

Figure 3 is a side view of a steelmaking now drilling drill device used in the now pre-treatment step in the method for refining metal iron from now according to the present invention.

4 is a cross-sectional view of the transfer cylinder of FIG. 2.

FIG. 5 shows a test report which measures the content of sulfur and phosphorus contained in the present in which the content of the metal iron refined by the present invention is 90% by weight or more.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings of FIGS. 1 to 5.

1. Now pre-processing step (S100)

In the pre-processing step, the slag and the metal iron are mixed in the pre-processing step to the size suitable for crushing by reducing the size by using a cutting machine having a diamond tip or a drill drilling machine and a breaker.

At this time, the steelmaking now drilling device 100, which is one of the cutting system or the drill drilling machine to be used will be described in more detail with reference to FIGS.

2 is a front view of a steelmaking now drilling apparatus according to an embodiment of the present invention, Figure 3 is a side view of a steelmaking now drilling apparatus according to an embodiment of the present invention.

2 and 3, the drilling apparatus for steelmaking now according to an embodiment of the present invention is a worktable 100, the steelmaking now is located on the upper surface, and extends upward from the worktable 100 to a predetermined height A control unit for controlling the operation of the support frame part 200 to be disposed, the one or more drilling drill parts 300 installed on the lower surface of the upper plate 210 of the support frame part 200, and the drilling drill part 300. It is configured to include.

At this time, the work table 100 is formed in the form of a flat table of a certain height, in order to perform a continuous automatic process by laying an automatic transfer device, such as a conveyor belt, steelmaking now is continuously supplied for the next process after drilling work It can also be transported.

In addition, the support frame portion 200 forming the basic frame of the drill apparatus is formed at the upper portion of the work table 100 together with the work table 100, and is disposed to maintain a predetermined height in consideration of the size of the steelmaking now supplied.

The support frame 200 is basically made of a plate-like material having a certain strength, such as steel sheet, but the front is open and the rear is closed with a thick plate 220 for easy operation, both sides also supply steel It may be formed to be open to facilitate discharge.

In the case of opening both sides of the support frame portion 200 in consideration of the installation of the drilling drill portion 300 on the lower surface of the upper plate 210 of the support frame portion 200 to withstand the load well As in the example, to form the pillars 230 for supporting the upper plate 210 on the front left and right, respectively, a plurality of drill holes 300 are laid to the work table 100 and the support frame portion 200 If the length of the is to be of course to increase the safety by installing a column 230 in the middle of the front.

On the other hand, the drilling drill unit 300 is a rotary drive device 310 to generate a rotational force by receiving power, the cylinder control device 320 is connected to the drive shaft of the rotary drive device 310 and the cylinder It is configured to include a transfer cylinder 330 installed on the lower portion of the control device 320, and a drill tip 340 detachable to the transfer cylinder 330.

In this case, the drill tip 340 is preferably a diamond drill tip, but is not limited thereto.

The rotary drive device 310 is a typical electric motor that operates by electric power is representatively installed on the lower surface of the upper plate 210 of the support frame portion 200 is fixedly installed, in particular, only the drill tip 340 is driven to rotate Rather than having to rotate the cylinder control device 320 and the transfer cylinder 330 to be installed in the lower portion of the rotary drive device 310 to provide a rotary drive device 310 having a sufficient torque, On the other hand, by using a variable electric motor capable of controlling the rotational speed may be configured to adjust the torque according to the size and state of steelmaking.

The cylinder control device 320 is a device for controlling the expansion and contraction of the transfer cylinder 330, and controls the transfer cylinder 330 according to the size of steelmaking now supplied on the work table 100 to the drill The drill tip 340 is lowered by slowly expanding the transfer cylinder 330 to adjust the initial working height of the tip 340 and to drill the steelwork now to a certain depth.

The configuration of the cylinder control device 320 is different depending on the type of the transfer cylinder 330. When the transfer cylinder 330 is hydraulic or pneumatic, the cylinder is controlled by adjusting the flow and pressure of hydraulic oil or compressed air. An apparatus for implementing control to expand or contract the 330 is provided, and when the transfer cylinder 330 is electric, the expansion and contraction of the transfer cylinder 330 is controlled by adjusting an operation of a device such as a motor or a screw. The device will be provided.

4 shows a sectional view of a hydraulic or pneumatic transfer cylinder.

4, the transfer cylinder according to an embodiment of the present invention is fixed to the cylinder control device 320 is placed, the first cylinder rod 331 having a maximum outer diameter, and the first cylinder rod 331 And a second cylinder rod 332 sliding up and down in the interior of the second cylinder rod 332 and a third cylinder rod 333 sliding up and down in the second cylinder rod 332.

The first oil pipe 31 through which hydraulic oil or compressed air flows in and out is connected to an upper end of the first cylinder rod 331, and at least two second oil pipes 32 through which inflow oil and compressed air flow in and out are also provided at the lower end of the side surface. It is connected. The lower surface of the first cylinder rod 331 has an opening having a size corresponding to the outer diameter of the second cylinder rod 332, and the sealing 34 is formed inward so that inflow oil or compressed air does not flow out. It protrudes and is formed.

An inlet hole 35 through which hydraulic oil or compressed air flows in and out is formed at an upper center portion of the upper end of the second cylinder rod 332, and a sealing 34 closely contacting the inner diameter of the first cylinder rod 331 is located outside the upper end. It is formed to protrude, and the lower surface is formed with an opening of a size corresponding to the outer diameter of the third cylinder rod 333 and also protrudes inward to prevent the inlet or compressed air to flow out to form a sealing 34. It is. In particular, the cylinder body forming the side of the second cylinder rod 332 is formed with at least two internal passages 33 for penetrating through the outer upper end and the inner lower end.

An inlet hole 35 through which hydraulic oil or compressed air flows in and out is formed at an upper end portion of the third cylinder rod 333, and a seal 34 closely contacting the inner diameter of the second cylinder rod 332 to the outside of the upper end thereof. It is formed to protrude, the lower surface is closed and the binding portion 334 (not shown in Figure 4) is laid so that the drill tip 340 can be attached.

Hydraulic oil or compressed air flowing into the second oil pipe 32 is introduced into the space between the lower seal 34 of the first cylinder rod 331 and the upper seal 34 of the second cylinder rod 332 and is again It flows along the inner flow passage 33 of the second cylinder rod 332 and flows into the space between the lower seal 34 of the second cylinder rod 332 and the upper seal 34 of the third cylinder rod 333. .

The operation of the transfer cylinder 330 configured as described above will be described briefly.

First, the expansion operation of the cylinder, when the hydraulic oil or compressed air flows into the interior through the first oil pipe 31 by the cylinder control device 320 transfers the pressure to the lower surface of the third cylinder rod 333. As a result, the third cylinder rod 333 is lowered, and the second cylinder rod 332 is subsequently lowered by pressure. At this time, the upper seal 34 of the third cylinder rod 333 and the lower seal 34 of the second cylinder rod 332, the inner flow path 33 of the second cylinder rod 332, the second cylinder Hydraulic oil or compressed air between the upper seal 34 of the rod 332 and the lower seal 34 of the first cylinder rod 331 is transferred to the cylinder controller 320 through the second oil pipe 32. Ejected and exited.

Next, referring to the contraction operation of the cylinder, when the hydraulic oil or the compressed air is introduced into the interior through the second oil pipe 32 by the cylinder control device 320, the upper seal 34 of the third cylinder rod 333 The pressure is transferred to the third cylinder rod 333 to raise the second cylinder rod 333 and the pressure is also transferred to the upper seal 34 of the second cylinder rod 332, and the second cylinder rod 332 is subsequently raised. Let's go. At this time, the hydraulic oil or the compressed air inside each cylinder rod is discharged to the cylinder control device 320 through the inlet hole 35 and the first oil pipe 31 to exit.

On the other hand, when the transfer cylinder 330 is contracted to a minimum, the length is about 50 ~ 70 cm, when the maximum expansion is preferably configured to be about 150 ~ 200 cm, which is the size of the drill device and supplied steel Considering the size of the.

In other words, if the minimum shrinkage length is greater than 70cm, the size of steelmaking steel that can be processed is limited. If the minimum shrinkage length is smaller than 50cm, the steel shrinkage steel can be cut into 4 steps and 5 steps to drill a certain depth. There is no choice but to increase the number of cylinders.

And when the maximum extension length is less than 150cm may occur if the drilling can not be drilled to a sufficient depth in accordance with the size of the steelmaking now supplied, if the maximum extension length is greater than 200cm load and size of the transfer cylinder 330 It becomes too large and may cause an overload of the rotary driving device 310 and the like, and it does not need to be made larger than this because the size of the steelmaking current supplied generally does not exceed 200 cm.

As mentioned above, a bottom portion of the third cylinder rod 333 of the transfer cylinder 330 has a binding portion 334 formed therein, and the binding portion 334 has the drill tip 340 for substantially drilling the steelmaking now. To be bound.

The drill tip 340 may be manufactured using a general cemented carbide for a tool, but in order to more efficiently drill steelmaking now, it is preferable to use a cemented carbide having a different characteristic from that of a general tool steel.

In other words, Hardness has a hardness of 10 to 14 based on Rockwell A scale (HRA), and Transverse Rupture Strength is 150 ~ 200㎏ / to be suitable for drilling of steel slag mixed with slag and steel. A cemented carbide having a value in the range of mm 2 is to be used, which is harder and has lower strength than general tool steel.

In the case of manufacturing the drill tip 340 using tungsten carbide, which is used as a tool material, sintering of tungsten carbide 80 to 90% and cobalt 10 to 20% mixed powder shows similar characteristics. It is suitable for drilling holes.

On the other hand, such a diameter of the drill tip 340 is to be manufactured so as to be about 50 ~ 300mm in order to make the steel mill now pulverized easily, and provided with a plurality of drill tips 340 of different diameters It is desirable to be able to use the drill tip 340 of the appropriate diameter depending on the size.

In addition, it is preferable that the outer diameter of the uppermost first cylinder rod 331 of the transfer cylinder 330 is smaller than the outer diameter of the drill tip 340, which is the drill tip 340 enters into the interior while drilling the steelmaking now. In this case, because the transfer cylinder 330 expands in order to drill to a certain depth, a situation arises in which the drill tip 340 needs to enter.

On the other hand, the rotary drive device 310 and the cylinder control device 320 of the drilling drill unit 300 is controlled by the control unit (not shown in the figure), the control unit of the support frame unit 200 What is necessary is just to install it in the place which an operator easy to operate, such as the back plate 220 or the front or side of the work bench 100.

The control unit may be configured to directly control the drilling drill unit 300 by a mechanical operation while the operator visually during steelmaking now, using a variety of sensor devices, such as steel belt now on the worktable 100 conveyor belt It may be configured to control the entire device, including the drilling drill unit 300, such as to sense the supplied by the drill and puncture to a predetermined depth and then discharged.

In other words, if a steel breaker is used to separate the current, the size varies from 2 m. Therefore, the slag is first separated and removed by crushing into the crusher, which is large enough to be difficult to put in the crusher. However, since it is difficult to cut it to a certain size using a cutter system that is commonly used because it contains a large amount of metal iron, cobalt is constantly contained in the diamond tip. Using a cutting machine or a drill drilling machine that can drill, cut the current to a certain size, or directly punch the body now, and then break it by punching with a breaker.

In the case of cutting, it is desirable to cut the size so that the current size is about 300 mm, and in the case of drilling and drilling, the distance of the drilling hole should be about 30 to 40 cm, but the diameter of the drilling hole should be about 200 mm. The slag is first separated during the pretreatment process.

2. Shredding step (S200)

In the shredding step, shreds are cut to a certain size by using a shredder such as a rod mill, which is reduced in size through cutting, drilling, and perforation.

In the shredding step, it is preferable to shred the shredded size so as to be 0.01 to 300 mm, and during the shredding, only slag may fall apart, which is preferably separated and recovered to use only the slag.

3. Primary particle size separation step (S300)

In the first particle size separation step, the screen is separated into screens of 0.01 to 20 mm and 20 to 300 mm through screening. At this time, the size of 20mm or less is now separated and recovered, and only 20-300mm sized now is sent to the short purification stage.

4. Short refining step (S400)

In the short purification step, the slag residue or other contaminants remaining on the surface of various sizes are purified by using a shot machine.

In the short refining step, secondary pressure is refined by removing abrasive slag and foreign substances that adhere to the surface of metal iron by spraying sand and abrasives with high pressure air.

At this time. The slag or foreign substances attached to the surface of the present is mainly broken into pieces smaller than 1mm in size, and now containing a large amount of metal iron parts remain in size of 1mm or more.

5. Secondary particle size separation step (S500)

In the secondary particle size separation step, the particles having high iron content after the short refining step are screened in various sizes. At this time, it is separated by separating the now having a size of 0.01 ~ 1mm, 1 ~ 300mm.

Now, with the size of 1 ~ 300mm, metal iron now accounts for more than 90% of the total weight, and it is almost close to pig iron. Now, when the content of such metal is more than 90% by weight, it is used in steel making and mainly depends on imports. It can be recycled as an alternative to pig iron, which can contribute to the recycling of resources and the reduction of steel production costs.

Meanwhile, granules of less than 1 mm are used as a heavy material used to increase the weight ratio of objects having a constant volume because they are collected separately and recycled again, or because the weight ratio of the granules itself is high.

6. Non-settled slag recovery step (S600)

The non-adhesive slag recovery step (S600) is selected after the first particle size separation step (S300) and separated (now having a size of less than 1mm) or separated from the slag having a size of 0.01 ~ 20mm of the slag It refers to the step of recovering only the non-settled slag.

The non-adhesive slag recovery step is a recovery slag crushed through the recovery slag grinding step and the recovery slag grinding step having a size of 0.01 ~ 20mm of the now selected and separated in the primary particle size separation step and the recovery slag grinding step And a magnetic screening step of separately recovering and recovering only the non-attached slag having a size of 0.01 to 20 mm using a magnetic screening device.

The recovery slag grinding step is preferably performed using a ball mill, and the magnetic force selection step is preferably selected using a drum equipped with a magnet.

Therefore, the non-slag slag having a size of 20mm or less are collected separately and used to manufacture a shelter block, and in the case of self-adhesives having a size of 20mm or less, only screening of 1mm or more is separately selected through screening for steelmaking raw materials or weight increase. It is preferable to use it as a material.

In order to check the weight percentage of the components contained in the present invention in order to check whether the content of the metal iron refined by the present invention is 90% by weight or more can be used as a substitute for pig iron. Test was made.

Test methods were KS D1804: 2003-C, 1805: 2003-Si, 1803: 2003-S, 1802: 2001-P (1CP) Titrimetry (K2Cr2O7) -Fe.

In general, in order to use pig iron, the content of sulfur contained should be 0.05% by weight or less, and the content of phosphorus should be 0.15% by weight or less. However, in the conventional conventional refining method, sulfur is contained in an amount of 0.1 to 3.7% by weight and phosphorus is contained in an amount of 0.7 to 1% by weight so that it cannot be used as a material for replacing pig iron. After dropping the content of sulfur and phosphorus, it had to be used.

However, when the content of sulfur or phosphorus contained in the refined metal iron content of the present invention is 90% by weight or more, sulfur (S) is 0.027% by weight and phosphorus (P) is 0.11% by weight, which is sufficient to replace pig iron. It was confirmed from the test results of the test report shown in Figure 5 that the criteria that can be used as a substitute material can be passed.

In the above description, the technical idea of the present invention has been described with the accompanying drawings. However, the present invention has been described by way of example and is not intended to limit the present invention. In addition, it is obvious that any person having ordinary skill in the art to which the present invention pertains can make various modifications and imitations without departing from the scope of the technical idea of the present invention.

Claims

Cutting now using a cutter with diamond tip or diamond drill tip made of cemented carbide material with a hardness of 10 to 14 based on Rockwell A scale and a drag force of 150 to 200 kg / mm 2 and a diameter of 50 to 300 mm The steel pre-treatment step of now drilling to reduce the present size to a certain size by drilling with a drill device for drilling and then using a breaker;

Shredding step of shredding the now through the now pre-processing step to 0.01 ~ 300mm size;

A primary particle size separation step of separating and separating each of the now subjected to the crushing step into a size of 0.01 to 20 mm and 20 to 300 mm;

A short purification step of purifying by short-processing the now undergoing primary particle size separation; And

Purifying and recovering metal iron from now characterized in that it comprises a secondary particle size separation step of separating and sorting each of the now passed through the short purification step to the size of 0.01 ~ 1mm, 1 ~ 300mm.
In claim 1,

In the first particle size separation step and the second particle size separation step, the method of refining and recovering iron from a metal, which is carried out through screening using a screen device.
The method of claim 1, wherein

After the primary particle size separation step of recovering the metal iron from the now characterized in that it further comprises a non-adhesive slag recovery step of recovering only the non-adhesive slag having a size of 0.01 ~ 20mm separated and separated.
In claim 3,

The non-settled slag recovery step,

A recovery slag crushing step of pulverizing the now having a size of 0.01 ~ 20mm of the now or slag selected and separated in the primary particle size separation step; And

Metal iron from the now characterized in that consisting of a magnetic separation step of separating and recovering only the non-fixed slag having a size of 0.01 ~ 20mm by using a magnetic separator to recover the recovered now or recovered slag crushed through the recovery slag grinding step Tablet recovery method.
In claim 4,

The recovery slag grinding step of recovering metal iron from now characterized in that it is carried out using a ball mill.