KR20200065992A - Manufacturing method of sintered ore, and manufacturing apparatus of sintered ore - Google Patents

Abstract

According to one embodiment of the present invention, a sintered ore manufacturing method includes the following steps of: manufacturing a sintering mixture material including iron ore and a binding material; and inserting the sintering mixture material into a sintering trailer, and then, sintering the material by separately inserting a powdery material into the upper part of the sintering trailer. With respect to 100 wt%, the total amount of the binding material included in the sintering mixture material and the binding material inserted into the upper part of the sintering trailer, 4-24 wt% of the binding material is separately inserted into the upper part of the trailer as powder and, and the rest is used as the sintering mixture material. According to another embodiment of the present invention, a sintered ore manufacturing apparatus includes: a sintering trailer; a red heat sintered ore providing unit inserting red heat sintered ore into the lower part of the inside of the sintering trailer; a mixture material providing unit inserting a mixture material onto the red heat sintered ore; and a binding material providing unit feeding a binding material evenly onto the inserted mixture material in the width direction of the sintering trailer.

Description

A sintered ore manufacturing method, and a sintered ore manufacturing device {MANUFACTURING METHOD OF SINTERED ORE, AND MANUFACTURING APPARATUS OF SINTERED ORE}

It relates to a sintered ore manufacturing method and a sintered ore manufacturing apparatus.

The raw materials used in the blast furnace are largely classified into raw materials such as sintered ore, sizing ore and pellets, and coke for securing air permeability and reducing iron ore. Among them, sintered ore is the core raw material not only having the highest use rate but also the cheapest price. Therefore, various studies are being conducted to increase the use rate.

As a result, the sintering machine for the production of iron ore sintered ore gradually increased the effective burn area and enlarged it. By utilizing these large sintering machines, auxiliary materials such as iron ore, limestone, quicklime, quartzite and serpentine, semi-mineral and coke and anthracite A large amount of iron ore sintered ore is manufactured and supplied to the blast furnace using a binder.

Due to the nature of the sintering operation that draws air at room temperature downward in normal sintered ore production, heat is rapidly transferred to the lower portion of the sintered bed upper layer without sufficient heat required for firing. And, as it goes to the lower portion, the amount of heat accumulates and over-melting occurs, and there is a problem that the recovery rate of sintered ore decreases and non-uniform firing occurs.

The present invention solves the problems of conventional sintered ore manufacturing, and provides a method for manufacturing a sintered ore and a sintered ore manufacturing method capable of improving the recovery of sintered ore by inducing uniform firing by uniformly distributing heat in the upper and lower layers of the sintered bed.

The method for manufacturing a sintered ore according to an embodiment of the present invention comprises the steps of manufacturing a sintered blended raw material comprising iron ore and a binder, and loading the sintered blended raw material into a sintered bogie, and separately adding a powdered binder to the top of the sintered bogie And sintering.

With respect to the total amount of the binder included in the sintered compounding material and the total amount of the binder added to the top of the sintered bogie, 4 to 24% by weight of the binder is separately added to the top of the cart in powder form, and the remaining binder is used as the sintered compounding material. It can be.

With respect to the total amount of the binder contained in the sintered compounding material and the total amount of the binder added to the top of the sintered bogie, 9 to 15% by weight of the binder is separately added to the top of the bogie in powder form, and the remaining binder is used as the sintered compounding material. It can be.

By controlling the amount of the bonding material contained in the sintered compounding material and the bonding material input to the upper portion of the sintered bogie, the heat source distribution inside the sintered bogie is controlled to uniformly reduce the temperature deviations of the upper and lower portions of the sintered bogie in the sintering process. It may be firing.

The step of loading the sintered blended raw materials into the sintered bogie, and separately injecting a powder-type binder into the upper portion of the sintered bogie, the binder injected into the upper portion of the sintered bogie in the sintering process provides a heat source to the upper portion of the sintered bogie, and the sintered blended raw material The temperature rise of the middle part and the lower part of the sintered bogie is controlled by the content of the binder contained in the sintered bogie, thereby reducing the temperature deviations of the upper and lower portions of the sintered bogie to be uniformly fired.

The powder-type bonding material may be uniformly introduced in the width direction of the sintering bogie on the top of the sintering bogie.

The binding material injected into the upper portion of the sintered bogie may be selected from the group comprising CDQ Dust (Coke Dry Quenching Dust), Bunk coke, anthracite, and combinations thereof.

The binding material injected into the upper portion of the sintering cart may be CDQ Dust (Coke Dry Quenching Dust).

The binding material that is introduced into the upper portion of the sintered bogie may have a particle size of 3 mm or less.

The binding material injected into the upper portion of the sintered bogie may have a particle size of more than 0, and 1 mm or less.

The sintered ore manufacturing apparatus according to another embodiment of the present invention includes a sintered bogie, an upper light providing unit for charging the upper light inside the sintered bogie, a compounding material providing unit for charging the blending raw material over the charged upper light, and the And a binder providing unit that uniformly cuts the binder in the width direction of the sintered bogie over the loaded raw material.

With respect to 100% by weight of the total binder used for manufacturing the sintered ore, the binder cut out from the binder providing unit may be 4 to 24% by weight.

The binding material providing unit may include a storage portion in which the binding material is stored, and a cutting portion connected to a lower portion of the storage portion to cut the binding material into the sintered bogie.

The storage unit is provided with an internal space, a hopper body for storing the binding material, connected to an upper portion of the hopper body, a binder feeding line for supplying the binding material, and connected to an upper portion of the hopper body, the storage unit It may be to include a gas discharge line for discharging the gas inside.

The storage unit may further include a leveler for measuring the loading degree of the binder loaded in the hopper body, and a load cell for measuring the weight of the binder loaded in the hopper body.

The storage unit may further include a vibrator connected to the hopper body to vibrate the hopper body.

The cut-out portion, the cut-out body in communication with the lower portion of the hopper body, discharge of the binding material is made, a first valve disposed on the upper end of the cut-out body, and

It may be located below the first valve, and may include a second valve for quantitatively discharging the binding material through rotation.

The second valve may include a rotating roll that rotates about a horizontal axis connected to the cutout portion, and protrusions formed in even numbers along the outer circumferential surface of the rotating roll and spaced apart from each other.

When an imaginary line connecting a first protrusion, which is any one of the even protrusions, and a second protrusion formed at a position opposite to the first protrusion forms a horizontal plane perpendicular to the horizontal axis, the inside of the cutout body is the horizontal plane It may be divided into upper and lower standards.

At the bottom of the cutting body, an outlet through which the binding material is discharged is formed, and the cutting portion may be formed at the outlet to further include a third valve that controls the quantitative discharge of the binding material.

The cutting portion may be located below the cutting body, and may further include a binder inclined plate that guides the cut binder to the sintered bogie.

The compounding material providing unit is a surge hopper in which the compounding material is stored, is connected to the lower end of the surge hopper, the drum feeder for discharging the compounding material to the sintering cart, and located below the drum feeder, the sintering cart Based on the moving direction, it may be located at the rear of the inclined plate of the binder, and may include an inclined plate of compounding material for guiding the discharged compounding material to the sintered bogie.

The compounding material providing unit may further include a cut-off plate that is positioned in front of the inclined plate of the binder to flatten the charges loaded on the sintered bogie, based on the moving direction of the sintered bogie.

The width of the cutout may be formed to have the same length as the width of the sintered bogie.

In the sintered ore manufacturing method according to an embodiment of the present invention, a binder is introduced into the upper layer of the sintered bed in powder form to supply an insufficient heat source to the upper layer of the sintered bed, and the amount of the binder contained in the sintered blended raw material is reduced to heat the lower layer of the sintered bed. By reducing the phenomenon of overmelting due to accumulation, the recovery rate of the sintered ore can be improved.

In addition, by using the binder providing unit according to another embodiment of the present invention by uniformly dispersing the binder powder on the top of the sintered truck, it is possible to improve the sintered ore recovery rate and the quality of the sintered ore.

1 is a schematic diagram of a method for manufacturing a sintered ore according to an embodiment of the present invention.
Figure 2 is a view showing the degree of thermal scale inside the sintered bed according to the moving direction of the sintered bogie according to the conventional sintered ore manufacturing method.
3 is a view showing the degree of thermal scale inside the sintered bed according to the moving direction of the sintered bogie of the sintered ore manufacturing method according to an embodiment of the present invention.
4 is a schematic view of a sintered ore manufacturing apparatus according to an embodiment of the present invention.
5 is a schematic diagram of a binder providing unit according to an embodiment of the present invention.
Figure 6 is an enlarged cut-out of the binder providing unit according to an embodiment of the present invention.
Figure 7 is an enlarged third valve of the binder providing unit according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail. However, this is presented as an example, and the present invention is not limited thereby, and the present invention is only defined by the scope of claims to be described later.

In this specification, terms such as first, second, and third are used to describe various parts, components, regions, layers, and/or sections, but are not limited thereto. These terms are only used to distinguish one part, component, region, layer or section from another part, component, region, layer or section. Accordingly, a first portion, component, region, layer or section described below may be referred to as a second portion, component, region, layer or section without departing from the scope of the present invention.

In the present specification, when a part “includes” a certain component, it means that the component may further include other components, not to exclude other components, unless specifically stated otherwise.

In this specification, the terminology used is only for referring to a specific embodiment, and is not intended to limit the present invention. The singular forms used herein include plural forms unless the phrases clearly indicate the opposite. As used herein, the meaning of “comprising” embodies a particular property, region, integer, step, action, element, and/or component, and the presence or presence of other properties, regions, integers, steps, action, element, and/or component. It does not exclude addition. Also, the singular form includes the plural form unless otherwise specified in the phrase.

When a portion of a layer, film, region, plate, or the like is said to be "above" or "on" another portion, this includes not only the case where the other portion is "directly above" but also another portion in the middle. In addition, in the whole specification, "~top" means that it is located above or below the target part, and does not necessarily mean that it is located on the upper side based on the direction of gravity.

All terms including technical terms and scientific terms used herein have the same meaning as those generally understood by those skilled in the art to which the present invention pertains. Commonly used dictionary-defined terms are further interpreted as having meanings consistent with related technical documents and currently disclosed contents, and are not interpreted as ideal or very formal meanings unless defined. For example, mixing is used in the same sense as compounding.

Thus, in some embodiments, well-known techniques are not specifically described to avoid obscuring the present invention.

Method for manufacturing sintered ore

1 schematically shows a method for manufacturing a sintered ore according to an embodiment of the present invention.

The method for manufacturing a sintered ore according to an embodiment of the present invention comprises the steps of preparing a sintered blended raw material comprising iron ore and a binder, and loading the sintered blended raw material into a sintered bogie, and separately adding a powdered binder to the top of the sintered bogie. And sintering.

By separately inserting and sintering the powder-form binder on the upper portion of the sintering cart, an additional heat source is supplied to the upper layer of the sintered bed to solve the shortage of heat in the upper layer of the sintered bed, and the recovery rate of the sintered ore in the upper layer can be improved.

With respect to the total amount of the binder included in the sintered compounding material, and the total amount of the binder added to the top of the sintered bogie, 4 to 24% by weight of the binder is separately added to the top of the cart in powder form, and the remaining binder is used as the sintered compounding material. It can be.

The amount of the binder used in the sintered blended raw material is relatively reduced compared to the conventional sintered blended raw material, so that the problem of overmelting due to the accumulation of excess heat at the bottom of the sintered bed in the sintering process can be solved, and the recovery of the sintered ore can be improved. .

As a result, by supplying an additional heat source to the upper portion of the sintered bed, the insufficient amount of heat is supplied to the upper layer, and the amount of binder used in the sintered blended raw material is reduced to reduce the accumulation of heat in the lower portion of the sintered bed. By controlling and sintering the entire sintered bed uniformly, it is possible to improve the recovery rate of the sintered ore and to reduce the cost of the sintered binder.

The amount of the binder that is separately added to the upper portion of the sintered bogie may be 4 to 24% by weight relative to 100% by weight of the total amount of the binder contained in the sintered blended raw material and the upper portion of the binder that is added to the upper portion of the sintered bogie. Specifically, it may be 4 to 15% by weight, 9 to 24% by weight, or 9 to 15% by weight. When the amount of the bonding material injected in the upper portion is too large, a sintering phenomenon may occur, and a sintered ore recovery rate may be lowered and a sintered ore quality may be lowered. When the amount of the binder material injected in the upper portion is too small, the amount of heat supplied to the upper layer of the sintered bed is insufficient, and thus, the recovery rate of the sintered ore may be insignificant.

By controlling the amount of the binder material included in the sintered blended raw material and the binder material injected into the upper portion of the sintered bogie, controlling the heat source distribution inside the sintered bogie, reducing the temperature deviation of the upper and lower portions of the sintered bogie during sintering, thereby uniformly firing It can be induced, and as a result, it is possible to improve the recovery rate of the sintered ore and the quality of the sintered ore.

Specifically, during the sintering process, the binding material injected into the upper portion of the sintering bogie provides a heat source to the upper portion of the sintering bogie, and the temperature rise of the middle and lower portions of the sintering bogie is controlled by the content of the bonding material contained in the sintered blended raw material, so that the upper portion of the sintering bogie is controlled. And it may be to uniformly fire by reducing the temperature variation of the lower portion.

The powder-type bonding material may be uniformly introduced in the width direction of the sintering bogie on the top of the sintering bogie. Not only can the temperature variation of the upper and lower portions of the sintered bogie be reduced, but also the temperature variation of the upper portion of the sintered bogie can be reduced to improve the recovery rate of the sintered ore through uniform firing.

The binding material injected into the upper portion of the sintered bogie may be selected from the group comprising dry cooling coke dust (Coke Dry Quenching Dust, hereinafter referred to as CDQ Dust), bun coke, anthracite, and combinations thereof. In this case, a heat source can be effectively supplied to the upper portion of the sintered bogie.

The recovery rate of the sintered ore may vary depending on the particle size characteristics and combustion behavior of the binding material injected into the upper portion of the sintered bogie.

Specifically, the binding material injected into the upper portion of the sintered bogie may be CDQ Dust (Coke Dry Quenching Dust).

In the case of CDQ Dust (Coke Dry Quenching Dust), since it has a smaller density and a faster combustion rate compared to bunk coke and anthracite, it can effectively supply a heat source to the upper portion of the sintered bed even if it is put in the upper portion of the sintered bed at the same rate.

The binding material that is introduced into the upper portion of the sintered bogie may have a particle size of 3 mm or less. Specifically, the particle size may be greater than 0 and less than or equal to 1 mm. When the particle size of the bonding material is too large, there is a problem that it is difficult to uniformly distribute it when it is injected into the upper layer of the sintered bed.

Figure 2 is a view showing the thermal scale of the inside of the sintered bed according to the moving direction of the sintered bogie according to the conventional sintered ore manufacturing method.

3 is a view showing the thermal scale of the inside of the sintered bed according to the moving direction of the sintered bogie of the sintered ore manufacturing method according to an embodiment of the present invention.

Referring to FIG. 2, it can be seen that in the prior art, since the amount of the binder contained in the sintered blended raw material is large, excess heat is accumulated in the lower layer of the sintered bed as sintering proceeds along the moving direction of the sintered bogie.

On the other hand, looking at Figure 3, according to an embodiment of the present invention, since the amount of the binder contained in the sintered blended raw material is relatively small, the amount of heat accumulated in the lower layer of the sintered bed as the sintering proceeds along the moving direction of the sintered bogie You can see that it is relatively small. Therefore, in the case of using the sintered ore manufacturing method according to an embodiment of the present invention, it is possible to improve the recovery rate of the sintered ore by uniform firing.

Hereinafter, an apparatus for manufacturing a sintered ore according to another embodiment of the present invention will be described, and a description of parts overlapping with those described above will be omitted.

Sinter ore manufacturing equipment

The sintered ore manufacturing apparatus according to another embodiment of the present invention includes a sintered bogie 100, an upper light providing unit 200 for charging the upper light inside the sintered bogie 100, and the blended raw material over the charged upper light. It includes a charging material providing unit 300 for loading, and a bonding material providing unit 400 for uniformly cutting out the binding material over the charged compounding material in the width direction of the sintered bogie 100.

The bonding material providing unit 400 may uniformly cut the bonding material in the width direction of the sintered bogie 100 to supply a uniform heat source to the upper layer of the sintered bed, thereby improving the recovery rate of the sintered ore.

The bonding material providing unit 400 is located in front of the compounding material providing unit 300 based on the moving direction of the sintered bogie 100, so that the bonding material can be cut out over the charged compounding material. Specifically, it may be located between the compounding material providing unit 300 and the cut-off plate 340.

The binder providing unit 400 includes a storage unit and a cutting unit.

A binder is stored in the storage unit.

The cutting portion quantitatively cuts the binder to the sintered bogie (100).

The storage unit includes a hopper body 411, a binder pressure supply line, and a gas discharge line 413.

A binding material is stored in the hopper body 411, and a binding agent is pushed to the hopper body 411 through a binding material feeding line.

The gas discharge line 413 is for gas discharge inside the hopper body 411.

The storage unit may further include a leveler 416 and a load cell 415.

The leveler 416 measures the loading degree of the binding material inside the hopper body 411.

The load cell 415 measures the amount of the binder loaded inside the hopper body 411.

The storage unit may further include a vibrator 414.

The vibrator 414 is for evenly distributing the binding material charged in the hopper body 411 by vibrating the hopper body 411.

The cut-out portion may include a cut-out body 421, a first valve 422, and a second valve.

The cutting body 421 discharges the binding material.

The first valve 422 stores the binding material inside the hopper body 411 by closing the valve at the bottom of the hopper body 411, and when necessary, opens the valve to replace the binding material stored in the hopper body 411 as the second valve. Transfer. The first valve 422 may be a butterfly valve, and may be opened and closed as the disk rotates around a transverse axis.

The second valve quantitatively discharges the binding material supplied through the first valve (422). The second valve may be a rotary valve, and the rotating roll 424 rotates about the horizontal axis 423, a space between the projection 425 and the cutting body 421, or the rotating roll 424 and the cutting body. The binding material may be quantitatively discharged through the space between (421).

The second valve may include a rotating roll 424 and protrusions 425 spaced apart from each other at equal intervals along the outer circumferential surface of the rotating roll 424.

A virtual line connecting the first protrusion 425, which is one of the even protrusions 425, and the second protrusion formed at a position opposite to the first protrusion is orthogonal to the horizontal axis 423 to form a horizontal surface. At this time, the inside of the cutout body 421 may be divided into upper and lower portions based on the horizontal plane.

Specifically, the horizontal plane is a plane consisting of two straight horizontal axes 423 and an imaginary line, and the horizontal plane may be a plane that is in equilibrium with the ground.

When the horizontal axis 423 and the imaginary line form a horizontal plane, the gap between the end of the first projection and the inner surface of the cutting body 411 does not allow the downward movement of the bonding material, and at the same time, the end and cutting body of the second projection ( The gap between the inner surfaces of 411) may not allow downward movement of the binder.

When the rotating roll 424 continuously rotates, the horizontal axis 423 and the imaginary line no longer form a horizontal surface, the gap between the end of the first protrusion and the inner surface of the cutting body 411 moves downward of the binder. At the same time, the gap between the end of the second projection and the inner surface of the cut-out body 411 can allow the downward movement of the bonding material.

Through the operation of the second valve on the same principle as described above, quantitative cutting of the binding material can be achieved, and it is formed in even numbers, through the adjustment of the spacing of the protrusions 425 formed at equal intervals or the rotational speed of the rotating roll 424. , It is possible to control the cutting amount of the binder.

The cutout body 421 may further include an outlet and a third valve 426.

The binder is discharged to the sintered bogie 100 through the outlet.

The third valve 426 is formed at the outlet and controls the quantitatively discharged binder material supplied through the second valve. The third valve 426 may be a cam-type valve.

The cutout portion may further include a binder inclined plate 427.

The binder inclined plate 427 guides the cut binder to the sintered bogie 100.

The compounding material providing unit may include a surge hopper 310, a drum feeder 320, and a compounding material inclined plate 330.

The compounding material providing unit may further include a cutoff plate 340.

4 is a schematic view of a sintered ore manufacturing apparatus according to an embodiment of the present invention.

In the sintered ore manufacturing apparatus in which the binder providing unit 400 according to an embodiment of the present invention is installed, a binder providing unit 400 is installed between the surge hopper 310 and the cutoff plate 340, and the binder providing unit 400 ), it is possible to input the binder used as a heat source.

5 is a schematic diagram of a binder providing unit 400 according to an embodiment of the present invention.

Figure 6 is an enlarged cut-out of the binder providing unit 400 according to an embodiment of the present invention.

First, the bonding material providing unit 400 is provided with a bonding material feeding line for conveying and transporting the bonding material from the ground, and a gas discharge line 413 for discharging the gas inside the hopper when being pressed. In addition, a hopper body 411 is provided with a loader 415 to measure the amount of the loaded binder, and a leveler 416 capable of measuring the loading of the binder. In addition, a vibrator 414 is attached for evenly distributing the binding material that is unevenly distributed inside the hopper body 411 by pressure feeding.

When the supply of the bonding material is made through the bonding material feeding line, the butterfly valve, which is the first valve 422, is initially closed to seal the hopper body 411 and the cutouts at the bottom of the hover body to allow the bonding material to be fed. 1 Open the butterfly valve, which is the valve 422, so that the binding materials pressed into the hopper can be transferred to the cutout.

As can be seen in Figure 6, by allowing the binder to be quantitatively supplied primarily by the rotation of the rotary valve, which is the second valve, and also a minute amount through the cam valve, which is the third valve 426, which is secondarily installed at the bottom. It is configured to enable precise control of the system.

7 is an enlarged view of a cam-type valve, which is an embodiment of a third valve according to an embodiment of the present invention. However, this is only an example of a cam type valve, and the shape of the third valve and the cam type valve is not limited thereto.

The cam-type valve constitutes a teardrop-shaped valve on the reference shaft (camshaft), and when rotated based on the camshaft, the width of the inlet discharged is changed according to the rotation direction adjustment to control the amount of outflow. After installing the one with the larger diameter among the tear drop shapes so that there is almost no separation on one wall surface of the discharge port, the width of the discharge port changes depending on the distance that the wedge shape is spaced from the wall surface opposite to the discharge port according to the rotation of the camshaft. Fine adjustment of the amount cut out from the control of the is possible.

The drive of the camshaft is configured such that it can be adjusted by a manual handle or by an electric motor, and it can be used continuously without adjustment after fixing the position when fine quantitative cutting is possible by adjusting the first or second times.

The cut-out portion composed of the butterfly valve, the rotary valve and the cam valve may be composed of 2 to 5 m to fit the width of the sintered bogie 100. In addition, through the adjustment of the number of revolutions of the rotary valve and the clearance of the cam-type valve, it was configured to quantitatively cut out the binder of 0.3~3t/hr.

Hereinafter, preferred examples and comparative examples of the present invention will be described. However, the following examples are only preferred examples of the present invention, and the present invention is not limited to the following examples.

The sintering simulation experiment (sintering POT experiment) in which the distribution of the heat source in the vertical direction of the sintered bed was controlled using a binder providing unit according to an embodiment of the present invention was performed to show the results.

Evaluation Example 1. Sintering result according to powder input

Based on 100 parts by weight of the total raw material for sintering, 4.2 parts by weight of the binder was used. Among the 4.2 parts by weight of the binder, 0.2 parts by weight, 0.5 parts by weight, 1.0 parts by weight, and 1.5 parts by weight, respectively, were added in powder form to the upper layer of the sintered bed, and the remaining binders were used in the preparation of the sintered compounding material to perform sintering simulation experiments. Table 1 shows the results.

In the above experiment, the sintered layer was set to a standard of 600 mm, and the upper layer means a point within 200 mm from the surface layer of the sintered bed, and the middle layer means 200 to 400 mm, and the lower layer means 400 to 600 mm, respectively.

As a binder, CDQ Dust (Coke Dry Quenching Dust) generated during coke production was used.

Table 1 below shows the evaluation results of the sintering characteristics according to the amount of powder input.

Powder input condition Sinter recovery rate
(%) Sintered binder cost
(kg/ts) Sintered ore strength
(%) Sintered ore reduction
(%) Comparative example Powder input X 77.5 72.9 74.2 69 Experimental Example 1-1 0.2 parts by weight of powder
Top input 77.8 72.5 74.1 69.2 Experimental Example 1-2 0.5 parts by weight of powder
Top input 78.6 71.4 74.1 71.5 Experimental Example 1-3 1.0 part by weight of powder
Top input 77.8 71.8 73.8 68.2 Experimental Example 1-4 1.5 parts by weight of powder
Top input 76.4 72.6 72.9 67.5

The ratio of the sintered binder is calculated by the amount of the binder used to make the sintered ore of the nature (+5mm) among the sintered ore discharged after the completion of sintering. As an example, if the total amount of sintered ore discharged is 52kg, among which, when the recovery rate of the property is 78%, the property sintered ore is 40.56kg, and when the total amount of the binder used is 2.94kg, the sintered binder cost is 2.94kg/0.04056ts = 72.5kg/ts Becomes.

Looking at Table 1, it can be seen that compared to the comparative example in which powder was not added, the sintering recovery rate is increased and the sintered binder ratio is decreased when 0.2 to 1.0 parts by weight of powder is added.

However, when 1.5 parts by weight of powder was added, the sintering recovery rate decreased, and the sintered binder cost increased.

In addition, it was confirmed that when the powder was added in an amount of 0.2 to 0.5 parts by weight, the reduction property of the sintered ore was improved.

In particular, it can be seen that the most effective when 0.5 parts by weight of powder is added.

It can be seen that the amount of the powder to be injected is relatively small in order to expect the effect of the powder injection when the amount of the binder in the upper portion of the sintered bed is less than 0.2 parts by weight.

On the other hand, when the input amount of the binder in the upper layer portion of the sintered bed is more than 1.5 parts by weight, the hyperplastic phenomenon occurs in the upper portion due to the supply of too much heat to the relatively upper portion of the sintered bed, thus causing non-uniform calcination throughout the sintered layer, and the sinter recovery rate is rather lowered. Also, the sintered ore quality (sintered ore strength, sintered ore reduction) tended to deteriorate.

Therefore, for the purpose of improving the sintering recovery rate and reducing the cost of the sintered binder, it is determined that the amount of the powder input to the upper portion of the sinter is 0.2 to 1.0 parts by weight, more specifically 0.4 to 0.6 parts by weight.

Evaluation Example 2. Results of sintering simulation experiments according to the type of input powder

Based on 100 parts by weight of the total raw material for sintering, 4.2 parts by weight of the binder was used. When the input amount of the upper portion of the sintered bed was fixed to 0.5 parts by weight among 4.2 parts by weight of the binder, the results of the sintering simulation experiments according to the type of the input powder are shown in Table 2.

Table 2 below shows the evaluation results of the sintering characteristics according to the type of input powder.

Type of input powder Sinter recovery rate
(%) Sintered binder cost
(kg/ts) Sintered ore strength
(%) Sintered ore
Reducibility (%) Comparative Example 2 Powder input X 77.5 72.9 74.2 69 Experimental Example 2-1 CDQ Dust
Top input
(Particle size <1 mm) 78.6 71.4 74.1 71.5 Experimental Example 2-2 Buncokes
Top input
(Particle size <3mm) 77.9 72.5 73.2 70.9 Experimental Example 2-3 hard coal
Top input
(Particle size <3mm) 77.7 72.6 71.6 70.4

Looking at Table 2, Comparative Example 2 (when the powder was not added to the upper layer), Experimental Examples 2-1, 2-2, and 2-3 confirmed that the binder usage was reduced and the sintering recovery rate was improved.

It was confirmed that the case of 2-1 in the experiment in which CDQ Dust was injected has a relatively superior effect than that of the powder coke and anthracite.

It is presumed that this depends on the particle size characteristics and combustion behavior of the powder to be injected.

That is, in the case of CDQ Dust, the particle size is small (<1 mm) compared to the other two types of powders, and when it is injected into the upper portion of the sinter at the same ratio, it tends to be evenly distributed in a uniform amount, and the effect of adding a heat source is excellent. On the other hand, in the case of pulverized coke and anthracite coal, the particle size is relatively large compared to CDQ Dust (<3mm), and accordingly, when it is injected into the upper portion of the sinter at the same rate, the degree of uniform distribution compared to CDQ Dust is low, thereby improving and combining recovery. It shows a characteristic with less effect of reducing costs.

In addition, when comparing the case of coke and anthracite coals having the same particle size, the anthracite coal has a higher density and a tendency to have a slower combustion rate compared to coke, and thus it is judged to have a tendency to have a small effect due to the sintering upper part of the powder. do.

Therefore, for the purpose of improving the sintering recovery rate and reducing the cost of the sintered binder, CDQ Dust of the type of powder injected into the upper portion of the sintering is preferable. When pulverized coke or anthracite is added, the particle size of 1 mm or less is advantageously distributed evenly over the sintered bed.

The present invention is not limited to the above embodiments, but may be manufactured in various different forms, and those skilled in the art to which the present invention pertains have other specific forms without changing the technical spirit or essential features of the present invention. It will be understood that can be carried out. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive.

10 Sinter truck 20 Upper light providing unit 30 Compounding material providing unit
50 Ignition furnace 100 Sinter truck 200 Upper light providing unit
300 Compounding material supply unit 310 Surge hopper 320 Drum feeder
330 Combined raw material Inclined plate 340 Cut-off plate 400 Binder providing unit
411 Hopper body 412 Binder feeding line 413 Gas discharge line
414 Vibrator 415 Load cell 416 Leveler 421 Cutting body
422 First valve 423 Horizontal axis 424 Turning roll 425 Turn
426 3rd valve 427 Binder swash plate 500 Ignition furnace
600 Main Blow 700 Windbox 800 Main ventilation pipe 900 Electrostatic precipitator
1000 Stack

Claims (23)

Preparing a sintered compounding raw material comprising iron ore and a binder; And
Including the step of loading the sintered blended raw materials into the sintered bogie, and separately sintering the powdered binder in the upper portion of the sintered bogie.
With respect to the total amount of the binder material included in the sintered compounding material, and the total amount of the binder material added to the top of the sintered bogie,
4 to 24% by weight of the binder is separately added to the top of the bogie in powder form,
The rest of the binder is used as a raw material for sintering,
Method for manufacturing sintered ore.
According to claim 1,
With respect to the total amount of the binder material included in the sintered compounding material, and the total amount of the binder material added to the top of the sintered bogie,
9 to 15% by weight of the binder is separately added to the top of the truck in the form of a powder, and the rest of the binder is used as a raw material for sintering,
Method for manufacturing sintered ore.
According to claim 1,
The step of loading the sintered blended raw materials into the sintered bogie, and separately sintering the powdered binder in the upper portion of the sintered bogie,
By controlling the amount of the bonding material contained in the sintered compounding material and the bonding material input to the upper portion of the sintered bogie, the heat source distribution inside the sintered bogie is controlled to uniformly reduce the temperature deviations of the upper and lower portions of the sintered bogie in the sintering process. Firing,
Method for manufacturing sintered ore.
According to claim 1,
During the sintering process, the binding material injected into the upper part of the sintered bogie provides a heat source to the upper part of the sintered bogie, and the temperature rise in the middle and lower parts of the sintered bogie is controlled by the content of the binder contained in the sintered blended raw material, By uniformly firing by reducing the temperature deviation,
Method for manufacturing sintered ore.
According to claim 1,
The binder in the form of powder is uniformly introduced in the width direction of the sintered bogie on the top of the sintered bogie,
Method for manufacturing sintered ore.
According to claim 1,
The binding material injected into the upper portion of the sintered bogie is selected from the group comprising CDQ Dust (Coke Dry Quenching Dust), Bunk coke, anthracite, and combinations thereof,
Method for manufacturing sintered ore.
According to claim 1,
The binding material injected into the upper portion of the sintered truck is CDQ Dust (Coke Dry Quenching Dust),
Method for manufacturing sintered ore.
According to claim 1,
The binding material to be injected into the upper portion of the sintered bogie will be less than 3mm,
Method for manufacturing sintered ore.
According to claim 1,
The binding material that is introduced into the upper portion of the sintered bogie will have a particle size of more than 0, and less than 1mm,
Method for manufacturing sintered ore.
Sintered bogie;
An upper light providing unit that loads upper light into an inner lower portion of the sintered bogie;
A compounding material providing unit for charging the compounding material onto the charged upper light; And
Including the binder material providing unit for uniformly cutting the binder material in the width direction of the sintered bogie over the loaded compounding material.
Sinter ore manufacturing equipment.
The method of claim 10,
With respect to 100% by weight of the total binder used in the production of the sintered ore, the binder cut out from the binder providing unit is 4 to 24% by weight,
Sinter ore manufacturing equipment.
The method of claim 10,
The binding material providing unit,
A storage unit in which the binding material is stored; And
It is connected to the lower portion of the storage, cutting unit for cutting the binder to the sintered bogie; sintered ore manufacturing apparatus comprising a.
The method of claim 12,
The storage unit,
A hopper body provided with an internal space to store the binding material;
A bonding material feeding line connected to an upper portion of the hopper body and supplying the bonding material; And
It is connected to the upper portion of the hopper body, a gas discharge line for discharging the gas inside the storage unit; sintered ore manufacturing apparatus comprising a.
The method of claim 13,
The storage unit,
A leveler measuring a loading degree of the binding material loaded in the hopper body; And
Further comprising a load cell for measuring the weight of the binding material loaded in the hopper body; further comprising a sintered ore manufacturing apparatus.
The method of claim 14,
The storage unit,
And a vibrator connected to the hopper body to vibrate the hopper body.
The method of claim 12,
The cutout portion,
A cutting body in communication with a lower portion of the hopper body, wherein the cutting body is discharged;
A first valve disposed on an upper end of the cut-out body; And
It is located below the first valve, the second valve for quantitatively discharging the binder through rotation; including a sintered ore manufacturing apparatus.
The method of claim 16,
The second valve
A rotating roll rotating about a horizontal axis connected to the cutting portion; And
A sintered ore manufacturing apparatus comprising; projections formed evenly spaced from each other along the outer circumferential surface of the rotary roll.
The method of claim 17,
When an imaginary line connecting a first protrusion, which is any one of the even protrusions, and a second protrusion formed at a position opposite to the first protrusion forms a horizontal plane perpendicular to the horizontal axis, the inside of the cutout body is the horizontal plane Based on the upper and lower sintered ore manufacturing apparatus.
The method of claim 16,
At the bottom of the cutting body, an outlet through which the binding material is discharged is formed,
The cutout portion,
A third sintered ore manufacturing apparatus further comprising; a third valve formed at the outlet to control the quantitative discharge of the binder.
The method of claim 12,
The cutout portion,
A sintered ore manufacturing apparatus further comprising; a binder inclined plate positioned below the cutting body and guiding the cut binder to the sintered bogie.
The method of claim 10,
The compounding raw material providing unit,
A surge hopper in which the compounding material is stored;
A drum feeder connected to the lower end of the surge hopper and discharging the compounding material into the sintered bogie; And
It is located below the drum feeder, based on the direction of movement of the sintered bogie, located in the rear of the inclined plate of the binder, the blended raw material inclined plate for guiding the discharged blended raw material into the sintered bogie;
The method of claim 21,
The compounding raw material providing unit,
And a cut-off plate positioned in front of the inclined plate of the binder to planarize the charge loaded in the sintered bogie, based on the moving direction of the sintered bogie.
The method of claim 12,
The cut-out portion is formed to have the same length as the width of the sintered bogie,
Sinter ore manufacturing equipment.

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