JPH01139731A - Method for charging sintering raw material into sintering machine - Google Patents

Abstract

PURPOSE:To intensity segregation of grain size on a pallet and to improve the permeability and yield by charging sintering raw material into an ore supply hopper through inclining chute, segregating grain size, storing and discharging while restraining dropping at the center part with a buffle. CONSTITUTION:The sintering raw material charged with a belt conveyor 6 is charged into the ore supply hopper 1 through the inclining chute 7. By this method, the sintering raw material is piled as sloping, such as high at the discharging side A and low at the reverse discharging side B. Then, the coarse grain is shifted to low side and the sintering raw material is stored under segregating the fine grain near inner wall face of the hopper at the A side and coarse grain at B side. At the time of discharging the sintering raw material through a drum feeder 2 and charging to the pallet 4 through on the sloping plate 3, the buffle 8 is set at center of lower part in the hopper 1 to uniformly drop by mass-flowing while restraining dropping at center part. By this method, the sintering raw material is charged as segregating grain size layer by layer on the pallet 4 and by improving the permeability and sintered yield, the production cost is reduced.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a method in which sintering raw materials are charged into an ore feed tank and stored, and then charged into a sintering machine via a drum feeder and a sloping plate. More specifically, the present invention relates to a method for charging sintering raw materials into a sintering machine that enhances grain size segregation of the sintering raw materials.

<Conventional technology> Conventionally, in the operation of a sintering machine, various sintering raw materials were mixed in a predetermined ratio, mixed in a mixer, charged into a feed hopper and stored, and cut out from a lower discharge port with a drum feeder. , loaded in layers on the sintering machine with sloping plates.

Generally, the sintering raw material onto the sintering machine is caused by interparticle percolation of the sintering raw material by a sloping plate under the drum feeder for the purpose of improving the surface yield of the sintered cake and improving air permeability during sintering. The grain size is segregated and charged so that the lower layer is coarse and the upper layer is finer.

However, if the sloping plate is not long enough due to the conflict between the ore feeding section and the sintering machine, satisfactory grain size segregation cannot be obtained. In such a case, a method is used in which the sintering raw material is preliminarily segregated in particle size in the advancing direction of the sintering machine in the feed hopper to facilitate segregation on the sloping plate.

As a method of segregating the grain size of the sintering raw material in the direction of movement of the sintering machine in the ore feed hopper, there is a method of attaching a movable chute to the tip of a shuttle conveyor installed on the ore feed hopper (Japanese Unexamined Patent Publication No. 58-217643). ) is known.

<Problem to be solved by the invention> However, the descent of the sintered raw material in the feed hopper is not a mass flow in which the entire raw material descends uniformly, but is similar to a funnel flow in which the raw material descends non-uniformly. If the surface of the sintered raw material is not supplied to the ore feed hopper, the central part will have a concave shape.

That is, as shown in FIG. 4 (1), when the sintered raw material is dropped from the shuttle conveyor 6 into the ore feed hopper 1 through the chute 7 which is inclined toward the A-side inner wall surface of the ore feed hopper 1, the sintered raw material is fed. The ore is deposited on the A side of the ore hopper 1 with a high angle of repose and on the B side with a low angle of repose. At this time, fine grains are segregated in the ore feed hopper 1 near the A side of the ore feed hopper, and coarse grains are segregated near the B side of the ore feed hopper.

The shuttle conveyor 6 continuously charges sintering raw materials into the movable ore feed hopper 1, and at the position where the drop charging into the ore feed hopper 1 is stopped, the drum feeder 2
As shown in Fig. 4 (2), the sintered raw material descends in a concave shape on the surface with the central part as the main flow, and the surrounding area is caught up in this main flow as shown by the arrow.
Even if grain size segregation is carried out, fine particles and coarse particles will be re-mixed and the effect of particle size segregation will be weakened.

In addition, as shown in FIG. 4 (3), after the level of the sintering raw material in the ore feed hopper l has decreased, when the input of the sintering raw material is resumed via the shuttle conveyor 6 and the inclined chute 7, the sintering raw material is Among the sintering raw materials, the coarse particles flow into the concave center part first, and after the surface of the sintering raw materials reaches the angle of repose, as shown in Fig. 4 (4).
As shown in the figure, the grain size is deposited at an angle and the original grain size segregation occurs. As mentioned above, even if measures are taken to cause particle size segregation of the sintering raw material in the feed hopper 1 when the sintering raw material falls in a funnel flow state, there is a problem in that controllability is poor and the effect is small.

The present invention solves the above-mentioned problems of the prior art, and makes the descent of the sintered raw material in the ore feed hopper a uniform mass flow in the pallet advancing direction, and the shape of the pile of the sintered raw material in the ore feed hopper is constantly sintered. The purpose of this is to strengthen the particle size segregation of the sintering raw material charged into the sintering machine by maintaining it high on the advancing side of the sintering machine and low on the non-progressing side of the sintering machine.

<Means for solving the problem> Generally, a baffle board is often installed at the bottom center of the powder hopper of equipment that handles powder to prevent the shelf from hanging. found that the funnel flow did not flow through the center of the hopper, but also descended along the side walls, resulting in an overall uniform mass flow.

In order to make use of this knowledge in the ore feed hopper, we installed a panful (baffle plate) at the bottom of the ore feed hopper and conducted repeated experiments. As a result, we determined that the fall of the sintered material in the ore feed hopper was used as a mass flow, and the ore feed hopper was used as a mass flow. The present invention has been completed, the main objective of which is to reliably segregate the particle size of the sintering raw material charged into the hopper.

As shown in FIG. 1, in the present invention, a sintering raw material is charged and stored in an ore feed hopper 1 by a raw material charging belt conveyor 6, and then cut out from the ore feed hopper 1 by a drum feeder 2 and passed through a sloping plate 3 to a pallet 4. In a method of charging sintering raw materials for a sintering machine in which raw materials are charged in layers on top, an inner wall surface of the raw material cutting side (side A) of the raw material feed water spit l is located between the raw material charging belt conveyor 6 and the ore feed hopper 1. An inclined chute 7 is installed facing the raw material charging belt conveyor 6, and the sintered raw material sent from the raw material charging belt conveyor 6 is dropped through the inclined chute 7, and the raw material cutting side (A) of the ore feeding hopper 1 is
The fine grains are segregated near the inner wall surface of the hopper on the A side, and the coarse grains are segregated near the inner wall surface of the hopper on the side opposite to raw material cutout (side B) by depositing them at a high angle on the side (side) and low on the side opposite to the raw material cutting side (side B). The sintered raw material in the ore feed hopper 1 is uniformly lowered from the drum feeder 2 by the mass flow while suppressing the descent of the central part by the panful 8 installed at the center of the lower part of the ore feed hopper 1. It is characterized in that it is cut out and charged onto a pallet 4 through the sloping plate 3 in a layered manner with particle size segregation.

In the present invention, as described above, an inclined chute 7 is installed so that the sintering raw material supplied from the raw material charging belt conveyor 6 (hereinafter referred to as belt conveyor) hits the inner wall surface on the A side of the ore feed hopper 1, and the ore feed hopper A baffle 8 is installed at the center of the bottom of the l.

The tilting chute 7 of the present invention is not required to be tiltable as disclosed in Japanese Patent Application Laid-Open No. 58-217643, and may be of a fixed type.

The baffle 8 serves as a discharge resistance for the sintered raw material in the ore feed hopper 1, so if the width is too large, it will cause hanging. Therefore, the width is set to be 172 mm or less than the width of the ore feeding hopper 1, and the length is set to 1/3 or more of the pallet width to prevent uneven charging in the pallet width direction.

Also, the shape of the baffle 8 makes it easier for the sintering raw material to fall.

As in, it spreads downward.

It is preferable to

It is preferable that the baffle be installed at a portion of the ore feed hopper 1 where the raw material is at the lower limit level. If the position is higher than this,
This is because when the level reaches the lower limit, the baffle 8 is exposed on the surface of the sintered raw material and becomes useless until it is buried by the next charging.

Since a cavity is created at the lower end of the baffle 8 based on the angle of repose due to the descent of the sintering raw material, an inverted triangular pyramid shaped member directed downward according to the angle of repose can be added to eliminate this.

<Function> As shown in FIG. 3 (1), the sintering raw material falls from the belt conveyor 6 such as a shuttle conveyor through the inclined chute 7 to the A side of the ore feed hopper 1. As a result, in the feed hopper 1, fine grains of the sintering raw material are segregated near the inner wall surface on the A side, and coarse grains are segregated near the inner wall surface on the B side.

In addition, the baffle 8 installed at the center of the lower part of the ore feed hopper 1 suppresses the funnel flow with the main flow in the center when the sintered raw material is cut out by the drum feeder 2, resulting in the flow shown in Fig. 3 (2). Since the flow is directed toward the A-side inner wall surface and the B-side inner wall surface as shown by the arrows, the surface of the sintering raw material maintains an inclined deposition due to the mass flow and descends uniformly without the surface becoming concave in the center.

As shown in Figure 3 (3), even if the level of the sintered raw material in the feed hopper l reaches the lower limit, the inclined deposition is maintained.
When the sintering raw material is dropped next time, it will not stay in the center and will start grain size segregation, as shown in Figure 3 (4).
), it is possible to re-charge while continuing the particle size segregation.

When the sintered raw material in the feed hopper 1 in such a segregated state is cut out by the drum feeder 2, as shown in Fig. 1, coarse particles are cut out in the contact area of the drum feeder 2, and fine particles are cut out in the separated areas. It will be done. Therefore, on the sloping plate 3, the coarse grains are segregated in the upper layer and the fine grains are segregated in the lower layer, and the sintering raw materials are charged in layers onto the pallet 4, with the fine grains segregated in the upper layer and the coarse grains segregated in the lower layer. will be done. Note that 5 indicates the direction of movement of the pallet.

<Example> In the apparatus shown in Fig. 1, an inverted U-shaped baffle is used, and the baffle width is 173 mm, which is the hopper width, and 27 mm, which is the pallet width.
Figure 2 compares the grain size segregation results in the layer thickness direction when the present method in which the particles were charged as a length of 3 and the conventional method without a baffle were charged on a pallet with a layer thickness of 700+Il+n. It shows.

According to the method of the present invention, compared to the conventional method, the particle size in the top layer is finer and the particle size in the bottom layer is thicker,
It can be seen that this has the effect of promoting particle size segregation.

<Effects of the Invention> According to the present invention, the grain size segregation formed in the ore feed hopper can be directly reflected in the grain size segregation of the sintering raw material layer supplied onto the pallet, so the segregation is strengthened and the air permeability is improved. The sintering yield is improved and manufacturing costs can be reduced.

[Brief explanation of the drawing]

FIG. 1 is an explanatory cross-sectional view in the pallet advancing direction showing an embodiment of the present invention, and FIG. FIG. 3 is an explanatory diagram showing the charging and cutting conditions to the ore feeding hopper according to the present invention, and FIG. 4 is an explanatory diagram showing the charging and cutting conditions to the ore feeding hopper according to the conventional example. DESCRIPTION OF SYMBOLS 1...Ore supply hopper, 2...Drum feeder, 3...Sloping plate, 4...Pallet, 5...Pallet advancing direction, 6...Belt conveyor, 7...(Rolling slope) Shoot, 8...
・Baffle. Patent applicant: Kawasaki Steel Corporation Figure 1 Figure 2 Average grain size of sintering raw material (Peng) Figure 3 Figure 4 (J) (4)

Claims (1)

[Claims] A sintering machine in which raw materials for sintering are charged and stored in an ore feed hopper 1 by a raw material charging belt conveyor 6, and then cut out from the ore feed hopper 1 by a drum feeder 2 and charged in layers onto a pallet 4 via a sloping plate 3. In the sintering raw material charging method, an inclined chute 7 is installed between the raw material charging belt conveyor 6 and the ore feed hopper 1 toward the inner wall surface of the raw material cutting side (A side) of the ore feed hopper 1, The sintered raw material sent from the raw material charging belt conveyor 6 is dropped through the inclined chute 7, and is high at the raw material cutting side (A side) of the ore feeding hopper 1 and at the opposite raw material cutting side (B side). The above raw material cutting side (
Fine grains are segregated and stored near the inner wall surface of the hopper on the A side (side A), and coarse grains are segregated near the inner wall surface of the hopper on the side opposite to raw material cutting (side B),
The sintered raw material in the ore feed hopper 1 is cut out from the drum feeder 2 while suppressing the descent of the center part by a baffle 8 installed at the center of the lower part of the ore feed hopper 1 and uniformly descending by mass flow. 3
A method for charging sintering raw materials into a sintering machine, characterized in that the raw materials for sintering are charged onto a pallet 4 via a sintering machine in which the grain size is segregated in a layered manner.