JP6693358B2 - Sintering raw material grain charging method and sintering raw material grain charging device - Google Patents

Description

  The present invention relates to a method of charging sintering raw material particles in which raw materials for obtaining a sintered ore are mixed and granulated, and the sintering raw material particles are charged into a pallet of a DL type sintering machine, and The present invention relates to a charging device.

  The iron raw materials used in the blast furnace include a lump ore of mined iron ore and a sintered ore obtained by firing a powder ore. The sinter ore can be obtained, for example, by firing iron ore powder ore together with limestone, powder coke, or the like.

  In producing this sinter, generally, various brands of powder ore, auxiliary materials such as limestone, and carbonaceous materials such as powder coke to be a solid fuel are mixed at a predetermined ratio, and water is added. In addition, the sintering raw material particles granulated into pseudo particles are manufactured, and the sintering raw material particles are loaded into a pallet of a DL (Dwightroid) type sintering machine that moves in the horizontal direction, and then loaded into the pallet. The upper layer portion of the thus-formed sintering raw material particles is ignited by a burner or the like, suction is performed from below the pallet, and sintering is performed while forcedly ventilating. Therefore, in order to improve the firing rate (reaction rate) and the sintering yield, the grain size of the sintering raw material particles loaded in the pallet becomes coarser in the lower layer portion than in the upper layer portion in consideration of air permeability. Need to do so. Further, it is desirable that the sintering raw material particles in the pallet be charged (filled) at a low density for the purpose of preventing the sintering raw material particles from being crushed and ensuring air permeability.

  Therefore, the sintering raw material particles stored in the hopper, etc. are cut out with a drum feeder, and a running plate inclined with respect to the horizontal direction is slid, or a belt feeder in which an endless belt is installed on a roller is installed in the traveling direction of sintering raw material particles A method is adopted in which the raw material particles for sintering are slid in a direction opposite to the direction described above and are loaded into a pallet (see, for example, FIG. 1 of Patent Document 1).

  Further, the sintering raw material particles cut out from the drum feeder are supplied to a belt feeder rotated in the traveling direction (forward direction) of the sintering raw material particles, and the belt feeder is vibrated (see the above-mentioned Patent Document 1). 3), the sintering raw material particles cut out from the belt feeder are supplied onto the slanted elastic sheet, and the elastic sheet is subjected to periodic tension and relaxation, so that the elastic sheet is flipped up and down. By doing so (see FIG. 1 of Patent Document 2), particle size segregation such that relatively large sintering raw material particles are arranged in the upper layer and relatively small sintering raw material particles are arranged in the lower layer on the belt feeder or the elastic sheet. There is also a method of generating and charging into a pallet.

Japanese Utility Model Publication No. 58-29440 Japanese Patent Laid-Open No. 62-107034

  As described above, in order to improve the productivity and obtain a high-quality sintered ore, the sintering raw material particles of relatively coarse particles are charged in the lower layer of the pallet, and the sintering raw material particles of relatively fine particles are added. Is required to be loaded in the upper layer of the pallet, and various methods have been studied so far.

  Under such circumstances, the present inventors paid attention to the time taken for the sintering raw material particles cut out by the drum feeder to be loaded into the pallet of the DL type sintering machine. That is, by making the sliding time of the sintering raw material particles longer, the particles of relatively large particles are arranged in the upper layer and the particles of relatively small particles are arranged in the lower layer while the sintering raw material particles roll in the meantime. I thought it was effective to use.

Here, for example, the length of the runner plate that receives the sintering raw material grains cut out from the drum feeder may be increased so that the sliding time of the sintering raw material grains is gained. However, there are physical limitations due to the arrangement of various devices and space in existing facilities. On the other hand, it is conceivable that the speed V for rotating the conveyor such as a belt feeder in the opposite direction is increased so that the time for the sintering raw material particles to slide on the conveyor is longer, but the baking cut from the drum feeder is performed. The rotation speed V cannot be increased from the initial speed v _{0 in} the advancing direction of the sintering raw material particles at the conveyor inlet when the binding raw material particles fall on the conveyor and the sintering raw material particles slide on the conveyor. That is, if the rotation speed V of the conveyor is increased from the initial speed v _{0, the} sintering raw material grains run in the reverse direction of the conveyor. Therefore, the reverse rotation speed V of the conveyor is theoretically maximum at the above-mentioned initial speed v ₀ . , Its effect is limited.

  Therefore, the inventors of the present invention have made earnest studies on a means for ideally filling the sintering raw material particles in the pallet while taking these into consideration. A slanting body that slides the sintering raw material particles cut out by the drum feeder is arranged between the drum feeder and the conveyor, and is burned at the conveyor inlet when the sintering raw material particles are supplied from the slanting body to the conveyor. By increasing the initial speed of the direction of movement of the binding raw material grains, it becomes possible to further increase the reverse rotation speed of the conveyor, and as a result, the sliding time of the sintering raw material grains on the conveyor can be made longer. The inventors have found that the grain size segregation of the sintering raw material grains in the pallet is strengthened, and have completed the present invention.

  Therefore, the object of the present invention is to enhance the grain size segregation in which the grain size of the sintering raw material grains in the pallet is coarser in the lower layer portion than in the upper layer portion, and the sintering raw material grains can be arranged ideally. It is to provide a method for charging sintering raw material particles.

  Another object of the present invention is to enhance the grain size segregation in which the grain size of the sintering raw material grains in the pallet becomes coarser in the lower layer portion than in the upper layer portion, and the sintering raw material grains are ideally arranged. An object of the present invention is to provide a charging device for sintering raw material particles.

That is, the gist of the present invention is as follows.
(1) Sintering raw material granulated by mixing raw materials for obtaining a sintered ore is cut out by a drum feeder, and charged into a pallet of a DL type sintering machine via a conveyor inclined with respect to the horizontal direction. In the above, by rotating the conveyor in the direction opposite to the advancing direction of the sintering raw material particles, a method of charging the sintering raw material particles in which the sintering raw material particles are slid on the conveyor,
An inclined body that slants with respect to the horizontal direction and slides the sintering raw material particles cut out by the drum feeder is arranged between the drum feeder and the conveyor, and the sintering raw material particles are supplied from the inclined body to the conveyor. The initial velocity v ₀ 'in the advancing direction of the sintering raw material grains at the conveyor inlet when the firing was performed at the conveyor inlet when the sintering raw material grains were directly supplied to the conveyor from the drum feeder without disposing the inclined body. set to be faster than the initial velocity v ₀ traveling direction of the sintering raw material particles, and wherein the conveyor speed is traveling the opposite direction of the velocity of the sintering material grains on the conveyor to rotate faster than the initial velocity v ₀ Method of charging sintering raw material particles.
(2) The method for charging sintering raw material particles according to (1), wherein the inclined body is a run-up plate or a conveyor that rotates in a direction opposite to the traveling direction of the sintering raw material particles.
(3) The inclined body is a conveyor that rotates in a direction opposite to the traveling direction of the sintering raw material particles, and the inclination of the sintering raw material particles is higher than that of the conveyor rotation speed V ₁ of the first conveyor forming the inclined body. The method for charging sintering raw material particles according to (1) or (2), wherein the conveyor rotation speed V ₂ of the second conveyor located on the downstream side in the traveling direction is rotated at high speed.

(4) A drum feeder that cuts out the sintering raw material granulated by mixing the raw materials for obtaining the sintered ore and a conveyor inclined with respect to the horizontal direction, and the conveyor advances the sintering raw material particles. A device for charging sintering raw material particles, which is rotated in the opposite direction to slidable and is slid into the pallet of a DL type sintering machine.
An inclined body that is inclined with respect to the horizontal direction and slides the sintering raw material grains cut out by the drum feeder is disposed between the drum feeder and the conveyor, and the inclined body is provided between the inclined body and the conveyor. The initial velocity v ₀ 'in the advancing direction of the sintering raw material particles at the conveyor inlet when the sintering raw material particles are continuously transferred to the conveyor is sintered from the drum feeder without disposing an inclined body. It is a velocity in the direction opposite to the traveling direction of the sintering raw material grains on the conveyor so as to be higher than the initial velocity v _{0 in} the traveling direction of the sintering raw material grains at the conveyor entrance when the raw material grains are directly supplied to the conveyor. An apparatus for charging sintering raw material grains, characterized in that the conveyor rotation speed can be rotated faster than the initial speed v ₀ .
(5) The apparatus for charging sintering raw material particles according to (4), wherein the inclined body is a run-up plate or a conveyor that rotates in a direction opposite to the traveling direction of the sintering raw material particles.
(6) Compared to the conveyor rotation speed V ₁ of the first conveyor constituting the inclined body, the inclined body is a conveyor that rotates in the direction opposite to the traveling direction of the sintering raw material particles, and The charging device for sintering raw material particles according to (4) or (5), which can rotate the conveyor rotation speed V ₂ of the second conveyor located on the downstream side in the traveling direction.
The conveyor rotation speed in the present invention represents the speed (V, V _1, V ₂ in the figure) in the direction opposite to the traveling direction of the sintering raw material particles on the conveyor inclined with respect to the horizontal direction. Is. Hereinafter, the conveyor rotation speed may be referred to, but they all mean this conveyor rotation speed.

  According to the present invention, the grain size segregation in which the grain size of the sintering raw material grains in the pallet becomes coarser in the lower layer portion than in the upper layer portion is strengthened, so that the sintering raw material grains can be ideally arranged. Become. In particular, the method for charging sintering raw material particles and the apparatus for charging sintering raw material particles in the present invention each employ a relatively simple means, and space is limited, interference with other devices, etc. Difficult to receive the problem of. Therefore, the present invention can be easily applied not only to newly constructing equipment but also to existing equipment.

It is a schematic explanatory drawing which shows the charging method of the sintering raw material grain using the conventional charging apparatus. It is a schematic explanatory view showing a charging method of sintering raw material particles using the charging device of the present invention. It is a schematic explanatory view which shows the charging method of the sintering raw material grain using the other charging apparatus which concerns on this invention. It is a schematic explanatory view which shows the charging method of the sintering raw material grain using the other charging apparatus which concerns on this invention. It is a schematic explanatory view which shows the charging method of the sintering raw material grain using the other charging apparatus which concerns on this invention. It is a schematic explanatory view which shows the charging method of the sintering raw material grain using the other charging apparatus which concerns on this invention. 2 shows a particle size distribution of sintering raw material particles A used in an experimental example. It is a model explanatory view of the charging device used in the experiment example. It is a model explanatory view of the charging device used in the experiment example. It is a schematic diagram explaining the method of evaluating the particle size segregation of the raw material grain pile obtained in the experimental example. It is a graph which shows the result of having evaluated the grain size segregation of the raw material grain obtained in the experimental example.

Hereinafter, the present invention will be described in detail.
According to the present invention, sintering raw material granulated by mixing raw materials for obtaining a sintered ore is cut out by a drum feeder and charged into a pallet of a DL type sintering machine through a conveyor inclined with respect to a horizontal direction. In doing so, the present invention relates to a method for charging sintering raw material grains in which the conveyor raw material grains are slid on the conveyor by rotating the conveyor in a direction opposite to the traveling direction of the sintering raw material grains.

FIG. 1 shows an example of a conventional method for such a charging method. That is, the state in which the sintering raw material particles accommodated in the hopper 1 are cut out by the drum feeder 2 and the sintering raw material particles 6 dropped vertically downward are received by the belt feeder 5 inclined with respect to the horizontal direction is schematically shown. In this example, a belt feeder (also called a belt conveyor) 5 in which endless belts 4 are installed on rollers 3 at both ends is used as a conveyor, and the endless belt 4 is a traveling direction of sintering raw material grains. And rotate in the opposite direction. Therefore, the sintering raw material particles slide on the inclined surface formed by the endless belt 4, but the sintering raw material particles 6 dropped from the drum feeder 2 have an inclination direction velocity due to free fall that is the initial velocity in the traveling direction at the entrance of the belt feeder 5. v ₀ . That is, the rotation speed V of the belt feeder 5 becomes the initial speed v ₀ at the maximum (more accurately, the absolute value of the rotation speed V is the absolute value of the initial speed v _{0 at} the maximum), and the belt feeder 5 is faster than the initial speed v _0. When the powder is rotated, the sintering raw material particles 6 run backward in the belt feeder 5, so that the pallet (not shown) on the outlet side of the belt feeder 5 cannot be loaded.

On the other hand, FIG. 2 shows an example of the charging method of the present invention. As a difference from the charging device shown in FIG. 1, the drum feeder 2 is inclined with respect to the horizontal direction. An inclined body 7 (FIG. 2 is an example of a runner plate) for sliding the cut out sintering raw material grains 6 is arranged between the drum feeder 2 and the belt feeder 5, and the inclined body 7 to the belt feeder 5 are arranged. The initial velocity v ₀ ′ in the advancing direction of the sintering raw material grains at the entrance of the belt feeder 5 when the sintering raw material grains 6 are supplied is faster than the initial velocity v _{0 in} the case of FIG. That is, an inclined body 7 is provided while the sintering raw material particles 6 cut out from the drum feeder 2 are supplied to the belt feeder 5, and the sintering raw material particles 6 cut out by the drum feeder 2 slide on the inclined body 7. By doing so, the velocity of the acceleration on the outlet side of the inclined body 7 is added to the velocity in the inclination direction as shown in FIG. 1, and the initial velocity v ₀ ′ in the advancing direction of the sintering raw material grains at the inlet of the belt feeder 5 becomes It is faster than the initial speed v _{0 in} the case of FIG. Therefore, the rotation speed V of the belt feeder can be made faster than the initial speed v ₀ (the maximum rotation speed V is this initial speed v ₀ ′).

  Here, in FIGS. 1 and 2, for the sake of convenience, the flow of the sintering raw material particles 6 cut out by the drum feeder 2 is indicated by a thick line arrow, and the sintering raw material particles 6 sliding on the belt feeder 5 are shown as a single line. Although expressed as particles, in reality, since a predetermined amount of the sintering raw material particles 6 cut out by the drum feeder 2 continuously slides (slides) on the belt feeder, these sintering raw material particles 6 Is charged into a pallet (not shown) on the outlet side while forming a raw material grain layer (the same applies to the following figures). Then, in the raw material grain layer made of the sintering raw material grains 6, when the sintering raw material grains 6 slide (roll) on the belt feeder rotating in the opposite direction, relatively large particles are arranged in the upper layer, Particle size segregation occurs in which relatively small particles are arranged in the lower layer. Particularly, by increasing the reverse rotation speed of the belt feeder 5 as in the present invention, each particle rolls on the belt feeder. It is possible to take a long time, and it is possible to enhance the particle size segregation as described above.

As an inclined body capable of accelerating the initial velocity of the sintering raw material grains supplied to the belt feeder in this manner, in addition to the runner plate 7 having a plate-like inclined surface as shown in FIG. 2, it is shown in FIG. As described above, the belt feeder 5-1 which rotates in the direction opposite to the traveling direction of the sintering raw material grains 6 may be used. In this case, compared with the rotation speed V ₁ of the first belt feeder 5-1 forming the inclined body, the second belt feeder 5-2 located downstream of the rotation speed V ₁ of the sintering raw material grains in the traveling direction. It becomes possible to rotate the rotation speed V ₂ faster. Also, two or more inclined bodies may be combined. That is, two or more run-up plates and belt feeders are arranged on the upstream side of the belt feeder before (immediately before) charging the sintering raw material particles into the pallet, and the sintering cut out by the drum feeder 2 is performed. The raw material grains 6 are slid respectively.

  For example, in FIG. 4, the sintering raw material particles 6 cut out by the drum feeder 2 slide on the runner plate 7 and the belt feeder 5-1 and transfer to the belt feeder 5-2 in front of the pallet (not shown). An example of a different charging device is shown. Further, FIG. 5 shows an example of a charging device in which the run-up plate 7 is provided between the belt feeder 5-1 and the belt feeder 5-2, and FIG. It is an example of a charging device in which a run-up plate is provided in the front and rear direction of the sintering raw material grains.

  Although the example using the belt feeder is shown in the above figure, the conveyor is not particularly limited as long as it can slide the sintering raw material grains by rotating in the opposite direction to the traveling direction of the sintering raw material grains, for example, Instead of the endless belt, an apron conveyor or a chain conveyor in which a steel pan is attached to a roller chain may be used. As these conveyors and run-up plates, those generally used in the past can be used. Side walls for partitioning are provided on both sides of the conveyor or the run-up plate along the traveling direction of the sintering raw material grains, and the sintering raw material grains slide in a charging space partitioned by the wall surface and having a predetermined width. You may do it. Further, the belt feeder may be equipped with a vibrator capable of imparting vibration to the endless belt, as shown in FIG. 3 of Patent Document 1, for example.

  Further, a classifying device may be provided on the exit side of the conveyor so that the sintering raw material particles having the particle size segregation formed on the conveyor can be further classified and charged into the pallet. As such a classifying device, for example, a plurality of rods in which gaps are formed are arranged in the advancing direction of the sintering raw material grains (longitudinal direction), or a direction orthogonal to the advancing direction of the sintering raw material grains (lateral direction). In addition to the above, there can be mentioned a classifying device having a classifying surface having slits such that the gap on the downstream side in the traveling direction of the sintering raw material grains is wider than the gap on the upstream side.

  Further, the hopper for accommodating the sintering raw material grains and the drum feeder for cutting it out are not particularly limited, and for example, a known one used as a DL type sintering machine can be used as it is. Further, the same applies to the raw materials for obtaining the sintered ore, the mixing ratio thereof, and the like, and generally used ones can be used. For example, in addition to various brands of powdered ore ore, limestone, quick lime, iron and steel slag, auxiliary materials such as dolomite and scale, carbon materials such as powdered coke and coal (solid fuel) may be added together with water and mixed. .. Then, when these are used as the sintering raw material particles, they may be granulated under the same processing conditions as the conventional one, using a drum mixer, a pan pelletizer, or the like. The binding raw material particles can be sintered by a known method using a DL type sintering machine to produce a sintered ore.

  Hereinafter, examples of the present invention will be described based on experimental examples, but the present invention is not limited to these contents.

<Experimental example>
Prepare a hopper that can be charged with approximately 50 kg of sintering raw material particles, a drum feeder installed in this hopper, a plurality of belt feeders of different lengths, and a plurality of run-up plates of different lengths. The charging device for the test was prepared by combining these belt feeders and run-up plates. Here, the belt feeder and the run-up plate are provided with side walls for partitioning on both sides thereof along the traveling direction of the sintering raw material particles, respectively. Even when they are used alone, they are also used in combination. Even in such a case, the sintering raw material grains slide in a charging space having a width (lateral width in the direction orthogonal to the traveling direction) of 0.3 m partitioned by the wall surface of the side wall.

  Further, in this experimental example, 55 kg of sintering raw material particles A prepared by mixing the raw materials shown in Table 1 together with water and granulating the mixture using a drum mixer were prepared. The sintering raw material grains A were prepared by newly preparing for each charging experiment under each condition described below, and the raw materials were blended according to the composition shown in Table 1, and the granulation treatment was performed every time under the same treatment condition. FIG. 7 shows a typical particle size distribution of the prepared sintering raw material particles A, and the average particle size was 4.8 mm.

  As the test charging device, the devices (a) to (f) schematically shown in FIGS. 8 and 9 were configured. That is, in the apparatus (a) shown in FIG. 8, the sintering raw material particles 6 housed in the hopper 1 are cut out by the drum feeder 2, and the falling sintering raw material particles 6 are slid on the run-up plate 7 having a plate-like inclined surface. The device (b) uses the belt feeder 5 instead of the run-up plate 7 in the device (a). On the other hand, the device (c) receives the sintering raw material particles 6 cut out by the drum feeder 2 by the runner plate 7 and slides them, and then transfers them to the belt feeder 5 and slides them. In d), the sintering raw material grains 6 cut out by the drum feeder 2 are received by the first belt feeder 5-1 and transferred to the second belt feeder 5-2 via the runner plate 7 to slide. .. Further, the device (e) is provided with a step between the first belt feeder 5-1 and the second belt feeder 5-2 instead of the run-up plate 7 of the device (d), and the first belt feeder The sintering raw material grains 6 are dropped on the exit side of 5-1 so that the second belt feeder 5-2 can be transferred, and the device (f) is a sintering device cut out by the drum feeder 2. After the raw material particles 6 are received by the runner plate 7 and made to slide, the sintering raw material particles 6 are made to slide using the first and second belt feeders and the runner plate 7 as in the device (d). ..

  Each of the belt feeders in these test charging devices was rotated in the direction opposite to the advancing direction of the sintering raw material grains 6, and the rotation speed was changed under each experimental condition as shown in Table 2. Further, the belt feeder 5 and the run-up plate 7 were both installed so that the inclination angle with respect to the horizontal direction was 40 degrees, and the run-out plate 7 and the belt feeder 5 slid the sintering raw material particles 6 in each experiment. Changed according to conditions. Furthermore, on the inlet side of the test charging device, the height at which the sintering raw material particles 6 cut out from the drum feeder 2 drop onto the runner plate 7 or the belt feeder 5 is 0.4 m, and the runner plate on the outlet side is set. 7 or the height at which the sintering raw material particles 6 dropped from the belt feeder 5 to the floor surface was 0.8 m, and these were fixed under all the experimental conditions. Then, 50 kg of the prepared sintering raw material grain A was slid by a test charging device and dropped on the floor surface at the outlet side so that the raw material grain mountain 8 of the sintering raw material grain A was formed. At that time, the rotation number of the drum feeder 2 and the gate opening (not shown) installed on the outlet side of the drum feeder 2 are adjusted to adjust the belt feeder of the test charging device and the width direction of the runner plate. The raw material supply rate (ton / hour) (per width of charging space) is set to about 50 t / h / m in experiments 1) to 5), and about 150 t / h / m in experiments 6) to 10). I tried to be.

  By the way, in the actual manufacturing, the pallet of the DL-type sintering machine is charged horizontally while the pallet of the DL-type sintering machine is charged horizontally on the outlet side of the charging device. Instead, the sintering raw material grains 6 are dropped onto the floor surface that does not move, and the raw material grain mountains 8 obtained with a length of about 1000 mm, a width of about 400 mm and a height of about 300 mm are based on the concept shown in FIG. The particle size segregation was evaluated. That is, regarding the raw material grain ridges 8 formed on the floor surface, here, the raw material grain ridges 8 having a length of about 1000 mm along the traveling direction of the sintering raw material grains are made to have a uniform mass of <1> to <6>. Each site was divided into 6 parts (that is, the mass of the sintering raw material grains was made the same at each position of these sites), and the mass ratio w of each site of <1> to <6> was calculated. Further, the sintering raw material particles in each part are classified with a sieve having a mesh size of 2 mm, 4 mm, and 8 mm to obtain the average particle size of the parts of <1> to <6>, and the average particle size of <1> to <6> is calculated. The average particle size of each site was divided by the average particle size of the whole to make it dimensionless.

Here, in the actual sintering machine, the raw material is continuously flowing, and the raw material grain piles as described above are not formed, and the raw material layer is filled in the height direction. Therefore, the sintering raw material having the actual machine layer thickness of 550 mm is used. Assuming a layer, the part of <1> to <6> that divided the raw material grain pile in the experiment that fell farthest was the part of <1> that was the lower layer side, and the closest part fell <6>. Is the upper layer side. Therefore, the position of the lower end of each part of <1> to <6> when the height ha is calculated from the mass ratio w of each part of <1> to <6> and a raw material layer of 550 mm is assumed. hb was calculated. That is, as described below, for example, the height ha1 of the portion <1> corresponds to the position hb2 of the lower end of the portion <2>. Then, if the center of each part is the height h from the floor surface, it can be determined as follows. As an example, Table 3 shows these calculation results in the case of experiment 4).
(Position hb at the bottom of each part)
hb1 = 0
hb2 = ha1
hb3 = ha1 + ha2
...
hb6 = ha1 + ha2 + ha3 + ha4 + ha5
(Height from the floor of each part h)
h1 = (ha1) / 2
h2 = hb2 + (ha2) / 2
h3 = hb3 + (ha3) / 2
...
h6 = hb6 + (ha6) / 2

  Then, for each of Experiments 1) to 10), a graph showing the relationship between the dimensionless average particle size calculated by the above method and the height position (h) was created. The results are shown in Fig. 11. That is, in FIG. 11, the height (center position) h of each part obtained as described above is taken as the vertical axis for the raw material grains 8 obtained in each experiment, and the average of the parts <1> to <6> A comparison of the degree of particle size segregation (degree of classification) that occurs in Experiments 1) to 10) with the value obtained by dividing the particle size (MS) by the average particle size (MS) of the entire sintering raw material grain A as the horizontal axis. Is. According to FIG. 11 (a) showing the results of Experiments 1) to 5) when the raw material supply rate was about 50 t / h / m, according to Experiments 1) to 3 of Comparative Example using the running plate or the belt feeder alone. Compared with the case of), in Experiments 4) and 5) of the present invention, the sintering raw material particles cut out by the drum feeder were once received by the runner plate or the belt feeder and supplied to the belt feeder for sliding. It can be seen that the tendency of grain size segregation in which the grain size of the sintering raw material grain becomes coarser is strengthened in the lower layer portion than in the upper layer portion. Similarly, according to FIG. 11 (b) showing the results of Experiments 6) to 10) when the raw material supply rate is about 150 t / h / m, according to Experiment 6) of the comparative example using the runner plate or the belt feeder alone. Compared to the case of ~ 8), the sintering raw material particles cut out by the drum feeder were once received by the runner plate or the belt feeder, and fed to the belt feeder to run and slide in the inventive examples 9) and 10). It can be seen that the grain size segregation is strengthened.

  Among them, in the case of the experiments 3) and 8) of the comparative example using the device (b), when the rotational speed of the belt feeder 5 in the reverse direction exceeds 1 m / s, the sintering raw material grains 6 flap and slide well. Although it was not possible, the belt feeder 5 of the experiment 4) of the present invention using the device (c) and the experiment 5), 9 of the present invention example using the devices (d) to (f). ), 10), the belt feeder 5-1 can be rotated at a reverse rotation speed higher than 1 m / s, and the sintering raw material particles can slide for a long time on the belt feeder. .. Therefore, according to the present invention, the grain size segregation in which the grain size of the sintering raw material grains in the pallet becomes coarser in the lower layer portion than in the upper layer portion is strengthened, and the sintering raw material grains can be ideally arranged. Like

1 Hopper 2 Drum Feeder 3 Roller 4 Endless Belt 5, 5-1 and 5-2 Belt Feeder 6 Sintering Raw Material Grains 7 Inclined Body (Running Plate, Conveyor)
8 raw material grains

Claims (6)

When the raw materials for obtaining the sintered ore are mixed and granulated, the raw material particles for sintering are cut out with a drum feeder and charged into a pallet of a DL type sintering machine through a conveyor inclined with respect to the horizontal direction. A method of charging the sintering raw material particles, which comprises rotating the conveyor in a direction opposite to the traveling direction of the sintering raw material particles and sliding the sintering raw material particles on the conveyor,
An inclined body that slants with respect to the horizontal direction and slides the sintering raw material particles cut out by the drum feeder is arranged between the drum feeder and the conveyor, and the sintering raw material particles are supplied from the inclined body to the conveyor. The initial velocity v ₀ 'in the advancing direction of the sintering raw material grains at the conveyor inlet when the firing was performed at the conveyor inlet when the sintering raw material grains were directly supplied to the conveyor from the drum feeder without disposing the inclined body. set to be faster than the initial velocity v ₀ traveling direction of the sintering raw material particles, and wherein the conveyor speed is traveling the opposite direction of the velocity of the sintering material grains on the conveyor to rotate faster than the initial velocity v ₀ Method of charging sintering raw material particles.   The method for charging sintering raw material particles according to claim 1, wherein the inclined body is a run-up plate or a conveyor that rotates in a direction opposite to a traveling direction of the sintering raw material particles. The inclined body is a conveyor that rotates in a direction opposite to the advancing direction of the sintering raw material particles, and is lower than the conveyor rotation speed V ₁ of the first conveyor forming the inclined body in the traveling direction of the sintering raw material particles. The method for charging sintering raw material particles according to claim 1 or 2, wherein the conveyor rotation speed V ₂ of the second conveyor located on the side is rotated at a high speed. A drum feeder that cuts out the sintering raw material granulated by mixing the raw materials for obtaining the sintered ore and a conveyor inclined with respect to the horizontal direction, and the conveyor is opposite to the traveling direction of the sintering raw material particles. An apparatus for charging sintering raw material particles, which is rotated in a direction and is slid into the pallet of a DL type sintering machine,
An inclined body that is inclined with respect to the horizontal direction and slides the sintering raw material grains cut out by the drum feeder is disposed between the drum feeder and the conveyor, and the inclined body is disposed between the inclined body and the conveyor. The initial velocity v ₀ 'in the advancing direction of the sintering raw material particles at the conveyor inlet when the sintering raw material particles are continuously transferred to the conveyor is sintered from the drum feeder without disposing an inclined body. It is a velocity in the direction opposite to the traveling direction of the sintering raw material grains on the conveyor so as to be higher than the initial velocity v _{0 in} the traveling direction of the sintering raw material grains at the conveyor entrance when the raw material grains are directly supplied to the conveyor. An apparatus for charging sintering raw material grains, characterized in that the conveyor rotation speed can be rotated faster than the initial speed v ₀ .   The apparatus for charging sintering raw material particles according to claim 4, wherein the inclined body is a run-up plate or a conveyor that rotates in a direction opposite to a traveling direction of the sintering raw material particles. The inclined body is a conveyor that rotates in a direction opposite to the advancing direction of the sintering raw material particles, and is lower than the conveyor rotation speed V ₁ of the first conveyor forming the inclined body in the traveling direction of the sintering raw material particles. The apparatus for charging sintering raw material particles according to claim 4 or 5, which can rotate the conveyor rotation speed V ₂ of the second conveyor located on the side of the second conveyor.

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