JPH1060550A - Method for granulating sintering raw material and classifying device used thereto - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a granulating method of sintering raw material and a classifying device used thereto which can suitably classify the granulated material discharged from a drum mixer and can efficiently granulate the sintering raw material by again granulating the classified fine grain. SOLUTION: The granulating method of the sintering raw material classifies the granulated material discharged from a second drum mixer 4 with the classified device 5. Then, the coarse grain is conveyed to a sintering machine 7, and the fine grain is granulated with a third drum mixer 9 after passing through a kneading treating part or a mixture stirring treating part 8 and circulated into the discharging hole end part of a second drum mixer 4. Further, the classifying device 5 used to this method, forms a piled heap having such inclination that the coarse grains roll down on the outer surface piling the fine grains, with the granulated material dropped from the discharging hole of a granulating machine at the upstream side, and takes out the fine grains in the inner part of the piling heap and the coarse grains rolled down from the piled heap, respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for granulating a sintering raw material at the time of producing a sintered ore to be charged into a blast furnace, and a classifier used for the granulating method.

[0002]

2. Description of the Related Art There are many brands of sintering materials, and as the pulverization of raw materials progresses further, in order to stably operate sintering and improve productivity, it is necessary to granulate sintering raw materials. Stability and improvement of performance are indispensable. In addition, as equipment for mixing and granulating the sintering raw materials supplied to the sintering machine, a drum mixer capable of large-capacity processing is used. (Ratio of the area occupied by the sintering raw material in the cross-sectional area of the drum mixer) varies, so that the rolling granulation performance changes and causes a fluctuation in operation.

To solve the above problems, Japanese Patent Application Laid-Open Nos. Sho 59-213432 and 59-199029 have been proposed.
For the number, the amount circulated from the outlet conveying line of the drum mixer to the inlet of the drum mixer or the upstream drum mixer is adjusted, and the optimum space factor for rolling granulation in the drum mixer is obtained. A method for such control is disclosed.

In order to circulate the granulated material from the drum mixer as described above and to improve the granulation effect, Japanese Patent Publication No. 59-20735 discloses an inclined flat plate on the drum mixer outlet side. It is placed and classified by flowing down the granulated material on the inclined flat plate, and is located in the upper layer of the coarse and fine-grained sedimentary layers formed by the particle size distribution generated on the transporter disposed below the inclined flat plate. There is disclosed a method of positively supplying only coarse particles to a sintering machine, such as scraping a fine particle portion to be circulated to an upstream drum mixer.

[0005] As described above, the particle size segregation of the granulated material on the conveyor is caused by the granulated material flowing down the inclined flat plate.
Those with a large particle diameter roll far to the foot of the pile when falling from the inclined plate, and those with a small particle diameter stop immediately below the inclined plate. Japanese Patent Publication No. 59-20735 uses the above principle to classify coarse and fine granules.

[0006]

However, Japanese Patent Application Laid-Open Nos. 59-213432 and 59-1990 describe above.
No. 29 only quantitatively distributes the granulated material supplied to the sintering machine and the granulated material circulated to the drum mixer, and clearly shows a method of distributing coarse particles and fine particles. Absent. In these methods, since the granulated material is quantitatively distributed and circulated as described above, coarse particles to be distributed to the sintering machine are often included in the raw material supplied to the drum mixer. It is returned to the mixer, which is inefficient.

In Japanese Patent Publication No. 59-20735 mentioned above, fine particles deposited on the upper layer of the deposited layer of the granulated material on the transporter are scraped by a scraper disposed in the upper layer on the downstream side of the transport. However, in this method, if the scraping depth is assumed to be constant, the thickness of the deposited layer will scrape even coarse particles that deposit in the lower layer if it is thick, and conversely, if it is thin, it will deposit in the upper layer. There is a problem in that fine particles are not scraped off. Therefore, in order to surely improve the classification efficiency by such a method, the discharge amount of the granulated material is controlled so that the relationship between the thickness of the deposited layer on the transfer machine and the scraping depth is always kept constant. It is necessary to control the scraping depth according to the thickness of the sedimentary layer of the granulated material, but this point is not explicitly disclosed in the above-mentioned JP-B-59-20735. In addition, in the above method, the surface of the deposition layer is leveled by the inclined flat plate. However, when an external force is applied to the granulated material discharged from the drum mixer in this way, there is a possibility that the pseudo particles may collapse. is there.

[0008] Further, regarding the apparatus surface, it is necessary to prevent the granules from adhering to the inclined flat plate or the scraping apparatus, and providing such members may increase the cost. Further, as described above, there is a problem that the classification performance cannot be maintained if the management of the thickness of the deposited layer of the granulated material on the transfer machine or the scraping depth of the scraping device is insufficient. Furthermore, when the powder is circulated to the upstream drum mixer, the granulation principle is rolling granulation, and the fine raw material adheres to the relatively coarse-grained raw material serving as the nucleus to form pseudo particles. It is necessary to mix the raw material to be the core particles and the fine raw material in an appropriate ratio.

It is desirable to mix the sintering raw materials to be granulated, put them into a drum mixer, and supply only appropriate granules to the sintering machine.
In the case where the raw material after leaving the drum mixer is classified and only the fine particles are circulated to the upstream drum mixer as in No. 2, the granulation performance is slightly improved due to the increase in the space factor in the drum mixer. Since this is a transient granulation process in which mixing and tumbling granulation are performed in a drum mixer in a state where core particles are insufficient, the degree of the granulation is not satisfactory.

The present invention has been made to solve the above-mentioned problem, and can appropriately classify coarse particles and fine particles among granulated materials discharged from a drum mixer. It is an object of the present invention to provide a method for granulating a sintering raw material which can be transported to a sintering machine and granulate fine particles reliably and efficiently, and a classifier used therefor.

[0011]

In order to achieve the above object, the present invention provides a method of depositing granulated material discharged from an upstream granulator and utilizing the particle size distribution generated in the pile to obtain fine particles. And coarse particles are conveyed to a sintering machine, and fine particles are subjected to soldering or mixing and stirring, then granulated, and circulated again to the discharge end of the upstream granulator. And By doing so, the granulated material can be classified efficiently, and the fine particles among them can be made strong coarse particles.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION
A method of granulating a sintering raw material, in which the sintering raw material is mixed and granulated by an upstream granulator, and then the granulated material discharged from an outlet of the granulator is classified into fine particles and coarse particles. The coarse particles are conveyed to a sintering machine, and the fine particles are granulated after being subjected to a sticking process or a mixing and stirring process, and are circulated again to the discharge end of the upstream granulator. If necessary, the coarse particles are weighed on a path for transporting them to the sintering machine, and the circulation amount of the fine particles is controlled so that the sintering production amount can be covered by the coarse particles.

According to the method of the present invention, high energy is mechanically given to the fine particles taken out by subjecting them to stiffening or mixing and stirring, followed by tumbling granulation. The product can granulate strong coarse particles.
In addition, when the circulated granules are returned to the classifier, the granules discharged from the upstream granulator and the circulated granules may collide with each other, causing the particles to collapse. It was returned to the discharge end of the granulator. As a result, the circulated granules and the granules granulated by the upstream granulator are sent to a classifier without disturbing the discharge trajectory, and are appropriately classified. In addition, if the amount of fine particles circulated is adjusted by weighing the coarse particles on the path for transporting them to the sintering machine, the amount of coarse particles supplied to the sintering machine can be reliably adjusted.

The classification device of the present invention has the following configuration. First, the principle of the classification will be described. FIG. 8 (a)
As shown in (b), the discharge trajectory of the granulated material discharged from the drum mixer D, which is the upstream granulator, has a velocity component Vy that falls freely in the ground direction and a discharge component in the rotation axis direction of the drum mixer D. And a radial velocity component Vr that rolls and falls on an inclined surface formed inside the drum mixer D. Then, the piles formed by the discharged granules have a particle size distribution in which fine particles are deposited inside and coarse particles roll on the outer surface.

FIG. 9 shows the particle size distribution when the granulated material discharged from the drum mixer D forms a pile M and fine and coarse particles are steadily classified. In the granulated material, coarse particles roll on the outer surface of the pile M as a steady flow, and the granulated material initially deposited remains inside the pile M. Therefore, first, since coarse particles roll on the outer surface of the pile M, the upper end thereof is located near the outlet of the drum mixer D so that the coarse particles roll only on one side of the pile M,
Further, a guide plate G was provided which was inclined at an angle larger than the angle of repose when the granules were deposited. This allows
The steady flow of the granulated material can be divided into the coarse-grain-side surface of the pile M and the vicinity of the shortest passage from the fine-grain-side guide plate G to the fine-grain discharge port. If the coarse particles rolling in one direction on the outer surface along the shape are taken out, only the coarse particles can be taken out efficiently, and on the other hand, the granules deposited on the opposite side of and inside the pile M can be taken out. If this is the case, only fine grains can be efficiently taken out.

The classifier according to the present invention utilizes the above-described principle. The first classifier according to the present invention is arranged such that its upper end is located near the discharge port of the upstream granulator, A guide plate inclined at an angle larger than the angle of repose when the material is deposited, and a guide across the discharge position of the granulated material so that the fine granules of the discharged granules are sequentially moved downward. The fine-grain side inclined plate provided opposite to the plate, and the coarse-grain side inclined from the upper end of the fine-grain side inclined plate to the opposite side so that coarse particles of the discharged granules are sequentially rolled downward. It has an inclined plate and a scraping mechanism for scraping fine particles guided by the guide plate and the fine-grain-side inclined plate.

In the first classifier, the fine particles inside the pile are successively guided downward by the guide plate and the fine-side inclined plate. The fine particles guided by the fine-grain-side inclined plate and the guide plate are scraped off by the scraping mechanism. On the other hand, the coarse-grain-side inclined plate is located on the outer surface of the pile where the coarse particles roll, and the inclined surface is located under the surface layer of the coarse-grained inclined plate. Move. At this time, since the coarse particles roll on the slope of the pile, the granulation effect is promoted. However, as shown in FIG. 9, classification can be performed without providing the coarse-grain and fine-grain side inclined plates inside the pile M.

Further, the second classifier comprises a belt conveyor horizontally arranged below the guide plate instead of the fine-grain side and coarse-grain side inclined plates and the scraping mechanism of the first classifier, and a belt conveyer. And a position adjusting device for adjusting the position of the tip of the belt conveyor such that the tip of the conveyor is located slightly inside the skirt of the pile on the opposite side to the portion guided by the guide plate. In the third classifier, the position of the tip of the belt conveyor in the second classifier is set by an angle adjusting device.

In these second and third classifiers, the coarse particles rolling on the surface layer of the pile are taken out from the tip of the belt conveyor whose tip is adjusted in position, and the coarse particles are put into the pile. The fine particles located are removed from the base end by driving the belt conveyor.

Further, the fourth classifier comprises a ring-shaped rotating plate for accumulating granules discharged from the upstream granulator,
A conical member fixedly arranged to cover the center opening of the rotary plate when viewed from a plane on the rotation center of the rotary plate, and the conical member has its entire skirt separated from the rotary plate. To form a gap communicating with the center opening of the rotating plate,
A scraping member for guiding fine particles to the gap is provided.

In the fourth classifier having the above structure, the granulated material is discharged to a ring-shaped rotating plate and forms a pile with the conical member included therein. Since the conical member is fixedly arranged, the fine particles located inside the pile are taken out from the gap of the conical member. On the other hand, the coarse particles located on the outer surface of the pile are taken out from the peripheral end of the rotating plate.

The fifth classifier has one side wall arranged near the outlet of the upstream granulator for receiving the granulated material discharged from the upstream granulator, and the lower outlet is provided with the outlet provided below. A hopper is formed in the vicinity of one side wall, in the vicinity of the side wall facing the one side wall, and cutout means provided in both discharge ports.

In the fifth classifier having the above structure, the fine particles are taken out from the discharge port provided near one side wall of the hopper, and the coarse particles are discharged from the discharge port provided near the side wall opposite to the one side wall. It is taken out from the exit.

The sixth classifier has one side wall arranged near the discharge port of the upstream granulator for receiving the granulated material discharged from the upstream granulator, and the lower discharge port. A hopper formed in the vicinity of one side wall and in the vicinity of the side wall facing the one side wall, the height of the side wall facing the one side wall being reduced; and coarse particles overflowing over the side wall facing the hopper. And a cutting means for cutting out fine particles in the hopper.

In the sixth classifier having the above structure, the fine particles are taken out from the discharge port of the hopper, and the coarse particles rolling on the outer surface of the pile are climbed over the side wall having the lowered height of the hopper, and then the chute is moved. Is taken out through.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a diagram for explaining the granulation method of the present invention. FIG. 2 is a diagram showing a schematic configuration of the first classification device of the present invention. FIG. 3 is a diagram showing a schematic configuration of the second classification device of the present invention. FIG. 4 is a diagram showing a schematic configuration of a third classification device of the present invention. FIG. 5 shows a fourth embodiment of the present invention.
FIG. 2 is a diagram showing a schematic configuration of a classification device of FIG. FIG. 6 is a diagram showing a schematic configuration of a fifth classification device of the present invention. FIG. 7 is a diagram showing a schematic configuration of a sixth classification device of the present invention.

The method for granulating a sintering raw material of the present invention is applied to a granulation equipment 1 as shown in FIG. First, the sintering raw material cut out from the raw material tank 2 is first and second drum mixers 3,
After being tumbled and granulated in 4, it is classified into coarse particles and fine particles by a classification device 5. The coarse particles among the granulated materials classified by the classifying device 5 are conveyed to the sintering machine 7 by the belt conveyor 6 and formed into sinter. On the other hand, the fine granules are passed through the toughening treatment section or the mixing / stirring treatment section 8, are then rolled and granulated by the third drum mixer 9, and are circulated again to the discharge end of the second drum mixer 4. In the granulating equipment 1, a weighing device 10 for controlling the circulation amount of fine particles so that the sintering production amount can be covered by coarse particles is arranged on a transport path to the sintering machine 7. With this weighing device 10, the amount of sintering produced can be checked by the amount of coarse particles transported, and the amount of fine particles circulated can be adjusted according to the amount of coarse particles transported. It is possible to reliably control the supply of goods.

In the above procedure, the fine particles classified by the classifying device 5 are subjected to an external force in a wet state to knead the fine particles so that the fine particles are kneaded so as to be granulated to a predetermined granulated particle size. After passing through the mixing / stirring processing section 8 for mixing and stirring the fine particles by the stirring blade rotating at a high speed, the granules are again granulated by the third drum mixer 9, and most of them are granulated into coarse particles having an appropriate particle diameter. It is returned to the discharge end of the two-drum mixer 4.
In the present invention, the granulated material discharged from the third drum mixer 9 is returned to the discharge end of the second drum mixer 4 because the granulated material discharged from the second drum mixer 4 is classified without disturbing the discharge trajectory. This is for guiding to the device 5. By performing such processing, productivity is improved.

Classifier 5 of the present invention used in the above granulation method
Is not particularly limited, but adopts various configurations such as the first to sixth classifiers described below to stably supply only coarse particles to the sintering machine 7. it can. FIG. 2 shows a first classification device 11 of the present invention, which has the following configuration. Reference numeral 12 denotes an inclined guide plate whose upper end is located in the vicinity of the granulated material immediately after being discharged from the second drum mixer 4 so that coarse particles do not flow into the fine particles. . Therefore, the angle of inclination of the guide plate is an angle that is larger than the angle of repose θ when the granules discharged from the second drum mixer 4 are deposited.

The reference numeral 13a is disposed on a bottom plate 14 provided below the discharge port of the second drum mixer 4, and guides fine particles of the granules discharged from the second drum mixer 4 with the guide plate 12. The fine-grain-side inclined plate 13b, which acts so that the fine-grain moves downward sequentially, 13b is a fine-grain-side inclined plate 13a
The upper end is in contact with the lower end, and the lower end is a coarse-grain side inclined plate arranged to be inclined in the opposite direction.
Performs the same operation as. Reference numeral 15 denotes a scraping claw having a part inserted into the pile in order to scrape the fine particles guided by the guide plate 12 and the fine-grain-side inclined plate 13a from the pile. Is driven to rotate. Reference numeral 17 denotes a chute for guiding the fine particles scraped off by the scraping claw 15 to the belt conveyor 18, and reference numeral 19 denotes a chute for guiding the coarse particles rolling on the outer surface of the pile to the belt conveyor 20. Hereinafter, common members in the second to sixth classifiers will be denoted by common reference numerals and shown in the drawings, and description of the configuration will be omitted.

In the classifier 11 having the above configuration, the second
The granulated material discharged from the drum mixer 4 is deposited on the fine-grain side inclined plate 13a and the coarse-grain side inclined plate 13b installed on the bottom plate 14. Then, by the action of the fine-grain-side inclined plate 13a and the coarse-grain-side inclined plate 13b, the piles are classified into fine and coarse particles, and the coarse particles roll on the coarse-grain-side inclined plate 13b, and the chute 19, It is conveyed to the sintering machine 7 via the belt conveyor 20. On the other hand, the fine particles guided to the fine-grain-side inclined plate 13a are scraped off by a scraping claw 15 rotationally driven by a driving device 16, guided to a belt conveyor 18 via a chute 17, and are connected to the circulating system described above. Transported to In addition,
Bottom plate 14 of fine-grained inclined plate 13a and coarse-grained inclined plate 13b
In the arrangement above, the position is appropriately changed in accordance with the angle of repose of the piled pile determined according to the properties of the granulated material and the like.

FIG. 3 shows a second classifier 21 of the present invention, which has the following configuration. This classifier 21
Is a bottom plate 14 of the first classifier 11 shown in FIG.
Fine grain side inclined plate 13a, coarse grain side inclined plate 13b, scraping claw 1
5 in that a belt conveyor 22 is provided instead of the belt conveyor 5. The belt conveyor 22 is arranged horizontally below the pile, and furthermore, its tip is located slightly inside the skirt of the pile opposite to the part guided by the guide plate 12. . In addition, belt conveyor 2
In step 2, the position of the tip is set by the position adjustment device 23 in accordance with the angle of repose θ of the pile that changes according to the properties of the granulated material.

The belt conveyor 22 is transported and driven in the direction in which the guide plate 12 is erected to take out the fine particles inside the pile, and the taken out fine particles are transferred to the belt conveyor 18 via the chute 17. . On the other hand, the coarse particles roll on the slope of the pile, fall from the tip of the belt conveyor 22, and are conveyed to the belt conveyor 20 via the chute 19. In the second classifier 21, the belt conveyor 22 sets the tip position in accordance with the angle of repose that changes according to the properties of the granulated material, so that appropriate classification can be performed according to the granulated material. Further, the belt conveyor 22 is not limited to the one arranged horizontally, and may be arranged inclined.

FIG. 4 shows a third classifier 31 according to the present invention. The classifier 31 of the third embodiment is different from the position adjuster 23 of the second classifier 21 in that a belt conveyor 32 is used. An angle adjusting device 33 is installed so that the tip of the device stands up and swings toward the guide plate 12.

FIG. 5 shows a fourth classification device 41 of the present invention. Reference numeral 42 denotes a ring-shaped rotary plate disposed below the outlet of the granulated material, and is rotated by a motor 42a. Reference numeral 43 denotes a conical member (hereinafter, referred to as a conical member) fixedly disposed above the rotary plate 42 so as to cover the center opening of the rotary plate 42 when viewed from a plane as shown in FIG. 5B. The conical member 43 forms a gap 47 communicating with the center opening of the rotating plate 42 by separating the entire circumference of the skirt from the rotating plate 42. Reference numeral 44 denotes a scraper provided in the gap 47 so as to protrude larger than the bottom diameter of the conical member 43 to guide fine particles to the gap 47. Reference numeral 45 denotes a dust-proof cover that covers the rotary plate 42 and prevents granules deposited on the rotary plate 42 from overflowing.
The opening 45a provided in 5 is provided with a scraper 46 for guiding coarse particles to the opening 45a by rotation of the rotating plate 42.

The piles on the rotary plate 42 are deposited in a conical shape having a vertex with the same rotation center of the rotary plate 42, and the coarse particles quickly roll on the outer surface of the pile and are scraped by the scraper 46 to the opening 45 a. It is scraped. On the other hand, the fine granules are
4 is scraped out to the gap 47. When the pile is larger than the rotating plate 42, the scraper 46
The granulated material comes into contact with the lower part of the wall surface and overflows out of the rotary plate 42 and is discharged, so that it can be unnecessary. in this case,
Adhesion prevention measures may be taken in the area of the dust-proof cover 45 that comes into contact with the granules.

FIG. 6 shows a fifth classifier 51 according to the present invention. Reference numeral 52 denotes a hopper for receiving granules from the second drum mixer 4, and a side wall 52 a near the discharge port of the second drum mixer 4. Has been placed. The outlets 52b and 52c of the hopper 52 are, in plan view, in the vicinity (52b) of the one side wall 52a and the one side wall 52a.
In the vicinity (52c) of the side wall 52d opposite to the side wall 52d. Reference numeral 53 denotes a roll feeder for cutting out fine particles guided to a discharge port 52b arranged near one side wall 52a of the hopper 52. Reference numeral 54 denotes a roll feeder that cuts out coarse particles guided to the discharge port 52c disposed near the opposing side wall 52d of the hopper 52.

In the classifier 51 having the above-described structure, the one side wall 52a of the hopper 52 is disposed below the outlet of the second drum mixer 4, so that the coarse particles among the discharged granules face each other. It rolls toward the side wall 52d, is guided by the side wall 52d by the rotation of the roll feeder 54, moves from below, and is cut out. On the other hand, the fine grain is one side wall 52a.
It accumulates in the vicinity and is cut out by the roll feeder 53.

FIG. 7 shows a sixth classifier 61 according to the present invention, which has the following configuration. Reference numeral 62 denotes a hopper that receives the granulated material from the second drum mixer 4, and has a side wall 62 a disposed near the outlet of the second drum mixer 4. The hopper 62 has one side wall 62.
The height of the side wall 62b opposed to a is reduced so that coarse particles of the accumulated and discharged granules discharged from the second drum mixer 4 get over the side wall 62b. This side wall 62
The coarse particles that have passed over b are guided to a belt conveyor 20 via a chute 19. On the other hand, the fine particles deposited in the hopper 62 are supplied to the roll feeder 6 provided at the outlet 62c.
3 and is guided to the belt conveyor 18.

In the above-described sixth classifier 61, the side wall 62b of the hopper 62 is set at substantially the same height as the inclined surface of the raw material formed by the angle of repose θ of the pile when the granules are deposited. Therefore, coarse particles of the granulated material discharged from the second drum mixer 4 roll on the slope of the pile, and
b and moves to the belt conveyor 20. In addition, the fine particles move downward in the hopper 62,
It is cut out by the roll feeder 63.

The present invention is not limited to the above embodiments, but may be modified in various ways. For example, the roll feeders 53, 54 and 63 in the fifth and sixth embodiments are belt feeders and Eurus feeders. You may.

[0042]

As described above, according to the granulation method according to the present invention, the granulated material discharged from the upstream granulator is classified, and the fine particles obtained by the classification are subjected to an adhesive treatment or After performing the mixing and stirring treatment, the granulation by rolling in the downstream granulator, so that it is returned to the discharge end of the upstream granulator again,
Fine granules can be efficiently granulated, and thus the overall granulation efficiency performed in this granulation step is improved. For classification, a pile of granules is formed by a classification device,
Since the coarse particles fall on the outer surface of the pile, the coarse particles can be stably supplied to the sintering machine without collapsing. In addition, since the classification device takes out the fine particles located inside the pile at which the particle size distribution has occurred, the coarse particles and the fine particles can be appropriately classified.

[Brief description of the drawings]

FIG. 1 is a diagram for explaining a method of granulating a sintering raw material according to one embodiment of the present invention, and is a diagram illustrating a granulation facility in which the granulating method is performed.

FIG. 2 shows a schematic configuration of a first classification device of the present invention,
(A) is a side view, (b) is a main part plan view.

FIG. 3 shows a schematic configuration of a second classification device of the present invention,
(A) is a side view, (b) is a main part plan view.

FIG. 4 is a diagram showing a schematic configuration of a third classification device of the present invention.

FIG. 5 shows a schematic configuration of a fourth classification device of the present invention,
(A) is a side view, (b) is a main part plan view.

FIG. 6 is a diagram showing a schematic configuration of a fifth classification device of the present invention.

FIG. 7 is a diagram showing a schematic configuration of a sixth classification device of the present invention.

FIGS. 8A and 8B are diagrams for explaining the falling speed of the granulated material discharged from the drum mixer, where FIG. 8A is a side view and FIG. 8B is a front view.

FIG. 9 is a graph illustrating the principle of classification according to the present invention, in which a granulated material discharged from a drum mixer forms a pile and is continuously classified into fine particles and coarse particles. It is a figure showing distribution and a flow of raw materials.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Granulation equipment 4 2nd drum mixer (upstream granulator) 5 Classifier 7 Sintering machine 8 Net processing section or mixing and stirring processing section 9 3rd drum mixer (granulator) 11 Classifier 12 Guide plate 13a Fine-grain side inclined plate 13b Coarse-grain side inclined plate 14 Bottom plate 15 Scraping claw 21 Classifier 22 Belt conveyor 23 Position adjuster 31 Classifier 32 Belt conveyor 33 Angle adjuster 41 Classifier 42 Rotating plate 43 Conical member (conical member) 44) Scraper 46 Scraper 51 Classifier 52 Hopper 53 Roll Feeder 54 Roll Feeder 61 Classifier 62 Hopper 63 Roll Feeder θ (of pile pile) angle of repose

Claims (8)

[Claims] 1. A method for granulating a sintering raw material to be charged into a blast furnace, wherein the sintering raw material is mixed and granulated by an upstream granulator and then discharged from an outlet of the granulator. The granules are classified into coarse particles and fine particles, the coarse particles are conveyed to a sintering machine, and the fine particles are granulated after performing a sticking process or a mixing and stirring process, and then discharged again from the upstream granulator. A method for granulating a sintering raw material, wherein the sintering material is circulated to an end. 2. The method according to claim 1, wherein the coarse particles are weighed on a path for conveying the fine particles to a sintering machine, and the circulation amount of the fine particles is controlled so that the sintering production amount can be covered by the coarse particles. The granulation method of the sintering raw material according to the above. 3. A classifier for use in the method for granulating a sintering raw material according to claim 1 or 2, wherein the particle size distribution generated when the granulated matter discharged from the upstream granulator is deposited. In order to take out coarse particles and fine particles by utilizing, the upper end thereof is located near the outlet of the upstream granulator, and is inclined at an angle larger than the angle of repose when the granules are deposited. A guide plate, and a fine-grain-side inclined plate provided opposite to the guide plate across a discharge position of the granulated material so as to sequentially move fine granules of the discharged granulated material downward, A coarse-grain-side inclined plate inclined from the upper end of the fine-grain-side inclined plate to the opposite side so as to sequentially roll coarse particles of the discharged granules, and the guide plate and the fine-grain-side inclined plate And a scraping mechanism for scraping fine particles guided by the device. 4. The classifying apparatus according to claim 3, wherein a belt conveyor horizontally arranged below a guide plate instead of the fine-grain side and coarse-grain side inclined plates and the scraping mechanism, and the tip of the belt conveyor is provided with the guide A classifier, comprising: a position adjusting device that adjusts a tip position of the belt conveyor so as to be located slightly inside a skirt portion of a pile pile on a side opposite to a portion guided by the plate. 5. The classification device according to claim 4, further comprising an angle adjustment device for raising and swinging the end of the belt conveyor in the direction of the guide plate, in place of the position adjustment device. 6. A classifier used in the method for granulating a sintering raw material according to claim 1 or 2, wherein a ring-shaped rotary plate for depositing granulated matter discharged from an upstream granulator;
A conical member fixedly arranged so as to cover the center opening of the rotating plate when viewed from a plane on the rotation center of the rotating plate, and the conical member has a skirt portion entirely around the rotating plate from the rotating plate. A classifier, wherein a gap portion is formed so as to be separated from the rotating plate and communicates with a center opening of the rotating plate, and a scraping member for guiding fine particles to the gap portion is provided. 7. A classifier used in the method for granulating a sintering raw material according to claim 1 or 2, wherein one of the side walls is formed so as to receive the granulated material discharged from the upstream granulator. A hopper formed in the vicinity of the discharge port of the machine, the discharge port provided below is formed in the vicinity of the one side wall, and in the vicinity of the side wall opposite to the one side wall, and the cutting means provided in the both discharge ports. A classification device comprising: 8. A classifier used in the method for granulating a sintering raw material according to claim 1 or 2, wherein one side wall is formed on an upstream side to receive a granulated material discharged from an upstream side granulator. The discharge port is disposed near the discharge port of the machine, and the discharge port provided below is formed in the vicinity of the one side wall and in the vicinity of the side wall facing the one side wall, and the height of the side wall facing the one side wall is reduced. A classifier comprising: a hopper; a chute for guiding coarse particles that have overflowed over the opposing side walls of the hopper; and a cutting means for cutting fine particles in the hopper.