JPH09299825A - Method and apparatus for removing lightweight substance mixed into aggregate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently remove foreign matters mixed into aggregate to be washed with water and separated in an aggregate production, including light weight substances which are lighter than the aggregate but heavier than water. SOLUTION: When light weight substances 12 and aggregate 11 which are charged from an inlet 1a at one end into water in a classification tank 1 and precipitated are mounted on a conveyer 5 for transferring aggregate the tail part of which is located in water just under the inlet 1a and the top part of which is positioned on the water surface and discharged outside the tank 1, a water curtain 6a is formed by pressurized water ejected from the first nozzle line 6 at a position close to the water surface to which the conveyer 5 comes to separate the lightweight substances 12 from the aggregate 11 to retain just under the water surface. The lightweight substances 12 are transferred to the tail part which is located under the water surface of a trough 9 having a U-shaped cross section the top part of which is positioned on the water surface by pressurized water ejected from the second nozzle line 7 to be discharged outside the tank 1 by a scraper 6a which slides on the bottom surface of the trough 9 of the slanted conveyer 8 for discharging lightweight substances and moves to the top part side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to aggregates that are washed and sorted in an aggregate production plant (grain size is mainly 5 to 25).
mm Light gravel or recycled aggregate, etc.) is not suitable as an aggregate, but it is a light substance mixed in the aggregate that can efficiently remove light substances that are foreign substances that mainly settle in water. And a device suitable for implementing this method.

[0002]

2. Description of the Related Art As aggregates used for concrete in the civil engineering and construction industries, gravel having a particle size of 5 to 25 mm and recycled aggregates produced when a building is demolished are widely used. There is. Among such aggregates, the production of gravel
It is roughly divided into a method of crushing and selecting mountain rocks to make crushed stones, a method of collecting and selecting natural gravel and sand, and a method of selecting from excavated sediment flowing into dam lakes. It Most of the raw materials for natural gravel and sand have been collected from rivers, but from the viewpoint of river protection, collection is prohibited in most rivers today. Other than the sorting method, land gravel collected from the sedimentary layer of the old river bed and mountain gravel collected from the gravel layer of the mountain formed from the old river and the uplift of the seabed are the mainstream.

When collecting these natural gravel, various foreign substances unsuitable as aggregates due to their properties, such as debris of driftwood, roots of plant trees, pumice stone, and strips of plastic, are mixed due to the attributes of the collection site. I can't avoid doing it. Further, it is unavoidable to mix various foreign substances unsuitable as an aggregate due to its properties such as wood, plastics, and strips of sheets into the recycled aggregate generated when the building is demolished. If a material in which such foreign substances are mixed is used as an aggregate, the quality and strength of concrete will be deteriorated. Therefore, in recent years, aggregate production plants have begun to install a dust removal machine that removes these foreign substances in order to improve the quality of the aggregate, but all of them are lighter than water and only foreign substances that float on water. This method is based on the method of separating and removing slag using buoyancy with respect to water, and has the drawback that its removal efficiency is limited and that it is not possible to remove a light substance that is lighter than aggregate but sediments in water.

[0004]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned drawbacks of the prior art and removes light substances which are foreign substances mixed in gravel, recycled aggregate, etc. and are lighter than aggregate but settle in water. It is an object of the present invention to provide a method for removing a light substance mixed in an aggregate and a device suitable for carrying out this method, which has a high efficiency and is capable of removing a light substance floating in water.

[0005]

As a result of intensive studies to solve the above-mentioned problems, the inventors of the present invention have introduced an aggregate containing a light substance into the water in a classification tank through an inlet at one end and settled. At the time of discharging the light substance and the aggregate on the inclined aggregate carrying-out conveyor where the tail part is placed in the water immediately below the charging port and the top part is located on the water surface, and discharged to the outside of the classification tank,
A water curtain is formed by pressure water jetted from the first nozzle row at a position near the aggregate carrying-out conveyor to reach the water surface to separate light substances from the aggregate and allow them to stay just below the water surface. Driven into the tail portion located below the water surface of the inclined trough, which has a U-shaped cross section with the top portion located above the water surface, by the pressure water ejected from the second nozzle row located on the input port side, If it is discharged to the outside of the classification tank by a scraper that slides on the bottom surface of the inclined trough of the inclined conveyor for discharging light substances that rotates in the direction opposite to the rotation direction of the conveyor for discharging aggregate, and moves to the top side. The inventors have completed the present invention by clarifying that not only light substances floating in water but also light substances sinking in water can be effectively removed from the aggregate.

Then, a partition plate is installed in the classification tank so as to face the charging port to form a settling path for aggregate containing light substances, and the overflow is provided adjacent to the upper part of the partition plate forming the settling path. It was also clarified that the efficiency of removal of light substances can be further improved by providing a weir and overflowing and discharging the light substances floating in the sedimentation channel from the overflow weir.

In order to carry out the method of the present invention, a classification tank having an inlet for an aggregate into which a light substance is mixed is provided at one end, and a tail portion is submerged in water immediately below the inlet and the top portion is provided. Is placed on the surface of the water, the slanted aggregate conveyor for placing the aggregate into which the light substances that have settled are placed on the upper surface and transferred to the top part and discharged outside the classification tank, and A first nozzle row for ejecting pressurized water at a position near the aggregate carrying-out conveyor to form a water curtain on the aggregate carrying-out conveyor surface, and a first nozzle row separated from the aggregate by the water curtain and directly below the water surface A second nozzle row for ejecting pressured water that pushes back the light substances that accumulate in the inlet to the charging port side,
The top part is located above the water surface, and the tail part is located above the aggregate carrying-out conveyor, and the aggregate carrying-out conveyor is located below the water surface on the input port side from the position reaching the water surface. Slant conveyor for discharging a light substance equipped with a scraper that rotates in a direction opposite to the rotating direction of a conveyor for use with a conveyor, and the scraper of the slant conveyor for discharging a light substance slides on the bottom surface when moving from the tail to the top. It is provided between the inclined trough having a U-shaped cross section and the tail portion of the inclined trough and the pressure water jetting position from the second nozzle row, and is jetted from the second nozzle row. A backflow preventer and guide plates on both sides for guiding the light substance staying immediately below the water surface pushed back to the inlet side by the pressure water between the tail part of the inclined trough and the tail part of the inclined conveyor for discharging light substances. Equipped with With are apparatus, it is also to that investigation that can be easily implemented.

Then, in the device for removing the light substances mixed in the aggregate, adjacent to the upper part of the partition plate in the settling passage formed by the partition plate installed facing the charging port in the classification tank, If an overflow weir that overflows the light substances floating in the settling channel is provided in communication with the overflow gutter, the removal efficiency of the light substances can be further improved, and it is located at least below the water surface of the inclined trough. If the bottom surface is made of a mesh that allows water to pass through to the inlet side, the flow of water that pushes light substances into the tail part located below the water surface of the inclined trough by the pressure water ejected from the second nozzle row The conveyor for carrying out aggregates may be any of a belt conveyor, a chain conveyor, and a net conveyor. Further, the backflow preventive body and the guide plates on both sides have flexibility. Since it was also found that the efficiency of light substance removal is improved, and that the guide plates on both sides are made of mesh, the flow of pressure water ejected from the first nozzle row and the second nozzle row can be made smoother. is there.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a method for removing a light substance mixed in an aggregate according to the present invention and an apparatus of the present invention suitable for carrying out this method will be described in detail with reference to the drawings. FIG.
Is a longitudinal sectional view schematically showing one embodiment of the device of the present invention suitable for carrying out the method of the present invention, FIG. 2 is a plan view of FIG. 1, FIG. 3 is a sectional view taken along line AA in FIG. 4 is a sectional view taken along the line BB in FIG. 1, and FIG. 5 is a sectional view taken along the line C-C in FIG.

In the drawing, 1 is a classification for removing the light substance 12 from an aggregate 11 made of gravel and recycled aggregate containing light substances 12 such as driftwood debris, plant roots, pumice, plastics and sheet strips. It is a tank 1 and an inlet into which an aggregate 11 containing a light substance 12 is charged at one end thereof in the classification tank 1.
1a is provided. Then, the partition plate 1b is installed so as to face the charging port 1a, and the light substance is charged from the charging port 1a.
A sedimentation channel 2 is formed in which the aggregate 11 containing 12 sediments, and the sedimentation channel 2 is adjacent to the upper part of the partition plate 1b in the sedimentation channel 2.
It is preferable that an overflow weir 3 for overflowing the light substance 12 that is lighter than the water that has floated inside is provided in communication with the overflow gutter 4. At the lower part of the side wall of the classification tank 1, there are provided a hand hole, a drain valve, etc. for discharging and inspecting fine particles, earth and sand, etc. accumulated on the bottom of the classification tank 1, though not shown. There is.

The tail portion of 5 is in the water immediately below the subsidence channel 2,
Further, the top part is an inclined aggregate carrying-out conveyor positioned on the water surface, and the aggregate 11 mixed with the light substance 12 that has been introduced from the inlet 1a and settled is placed on the top surface of the aggregate. Aggregate that has been removed to remove light substances 12
Is discharged to the outside of the classification tank 1 as a product aggregate, and the rotary shaft in the portion existing in the water immediately below the charging port 1a is attached to the classification tank 1 via a water sealing mechanism. The aggregate carrying-out conveyor may be a belt conveyor, a chain conveyor, or a net conveyor.

Reference numeral 6 denotes a first nozzle row for ejecting pressured water at a position near the aggregate carrying-out conveyor 5 to reach the water surface to form a water curtain 6a on the surface of the aggregate carrying-out conveyor 5, and 7 denotes this first nozzle row. A second nozzle row for ejecting pressure water 7a that pushes back the light substance 12 that separates from the aggregate 11 and stays just below the water surface to the input port 1a side by the water curtain 6a formed by the pressure water ejected from the nozzle row 6 Is. Therefore, this second nozzle row 7
Need only be positioned closer to the inlet 1a side than the first nozzle row 6, and may be provided in one water supply pipe as shown in the drawing or in each of a plurality of water supply pipes.

Reference numeral 8 denotes an inclined conveyor for discharging a light substance, which is provided with a scraper 8a having a top portion which is rotated in a direction opposite to the rotation direction of the aggregate carrying-out conveyor 5 and is located above the water surface, and its tail portion. Is above the aggregate carrying-out conveyor 5, and is located below the water surface on the side of the charging port 1a from the position where the aggregate carrying-out conveyor 5 reaches the water surface.

Reference numeral 9 denotes an inclined trough having a U-shaped cross-section that slides on the bottom surface of the scraper 8a of the inclined conveyor 8 for discharging light substances when the scraper 8a moves from the tail portion to the top portion. At least the bottom surface located below the water surface is preferably made of a mesh body that allows water to pass through to the inlet 1a side. Between the tail portion of the inclined trough 9 and the position where the pressure water 7a is ejected from the second nozzle row 7, the water surface pushed back to the inlet 1a side by the pressure water 7a ejected from the second nozzle row 7 Light substances that accumulate directly below
A backflow prevention body 9a for guiding 12 between the tail portion of the inclined trough 9 and the tail portion of the inclined conveyor 8 for discharging light substances and guide plates 9b on both sides are provided. If the guide plate 9b is flexible, the end of the backflow preventer 9a is brought into contact with the conveyor 5 for carrying out the aggregate, and the ends of the guide plates 9b on both sides are brought into contact with the side wall of the classification tank 1. Since it can be operated in contact with a side skirt 13 which will be described later, the light substance 12 staying just below the water surface pushed back to the inlet 1a side by the pressure water 7a ejected from the second nozzle row 7 tilts the trough 9 Is preferable because the phenomenon of being not guided back to the inlet 1a side without being guided does not occur between the tail part of the above and the tail part of the inclined conveyor 8 for discharging light substances.
It is preferable that 9b is made of a mesh because it can make the flow of the pressure water ejected from the first nozzle row 6 and the second nozzle row 7 smoother. In the illustrated embodiment, the scraper 8a of the slant conveyor 8 for discharging the light material is used to slant the trough 9
The light substances 12 transferred to the water surface on the bottom surface of the water drop into the overflow weir 3 provided adjacent to the upper part of the partition plate 1b in the settling passage 2, but this classification tank 1 is not always necessary. It is not necessary to fall into the overflow weir 3 provided inside, and it is sufficient that the transferred light substance 12 is transferred to a predetermined position outside the classification tank 1.

Numeral 10 is an aggregate feeding device installed above the classification tank 1 so that the aggregate 11 mixed with the light substance 12 is charged into the charging port 1a of the classification tank 1, and the light substance 12 is mixed therein. An aggregate carry-in conveyor 10a for supplying the aggregate 11
Light material 12 supplied from this aggregate carrying conveyor 10a
Hopper 10b for receiving aggregate 11 mixed with
It is composed of a feeder 10c for feeding the aggregate 11 mixed with the light substance 12 that has dropped from the inlet to the inlet 1a at the end of the classification tank 1, and a vibrator is installed as this feeder 10c and is provided by this vibrator. It is preferable that the structure has a structure capable of uniformly leveling the aggregate 11 in the width direction by vibration.

Reference numeral 13 is a fixed plate 13a fixed to the side wall of the classification tank 1 and an elastic material whose lower end is in contact with the upper surface of the aggregate carrying-out conveyor 5. The upper end is fixed to the fixed plate 13a. The side skirt composed of the abutting pieces 13b, the aggregates 11 and the light substances 12 placed on the aggregate carrying-out conveyor 5 and transferred are provided on both side edges of the aggregate carrying-out conveyor 5 and the classification tank 1. It is intended to prevent falling from the space between the side wall and the bottom of the classification tank 1.

Further, 14 is placed on the aggregate carrying-out conveyor 5, is transferred to the outside of the classification tank 1 and adheres to the discharged aggregate 11 and is taken out of the classification tank 1 and is brought into the overflow gutter 4. When the overflow weir 3 provided in communication is provided, the sum of the amount of water overflowed from the overflow weir 3 is the first nozzle row 6
In order to keep the water level in the classification tank 1 constant when the amount of pressure water ejected from the water nozzle 6a is larger than the sum of the amount of pressure water 7a ejected from the second nozzle row 7 1 is a water supply pipe that supplies clean water by draining the contaminated water from the drain valve when the water in the classification tank 1 becomes contaminated, and this water supply pipe 14 is a classification tank It is preferable to be installed in the vicinity of the inlet 1a so as not to disturb the flow of water in the unit 1.

The operation for carrying out the method of the present invention by the apparatus of the present invention having the above-mentioned structure will be described in detail below. First, the aggregate 11 such as gravel and regenerated aggregate collected from a sampling site mixed with various light substances 12 such as driftwood debris, plant roots, pumice, plastic and sheet strips, The aggregate 10 is fed from the aggregate carrying conveyor 10a to the hopper 10b installed above the classification tank 1, and the classification tank 1 is fed from the input port 1a at the end of the classification tank 1 from the hopper 10b through the feeder 10c.
Put it in the water inside.

The aggregate 11 mixed with the light substance 12 charged into the classification tank 1 through the charging port 1a is separated from the partition plate 1b when the settling path 2 is formed as in the illustrated embodiment. On the inclined conveyor conveyor 5 for unloading aggregates where the settling path 2 gradually settles in the direction of approaching the partition plate 1b, the tail part is placed in the water directly below the inlet 1a, and the top part is located on the water surface. When the aggregate carrying-out conveyor 5 is moved from the water surface to the water surface, the aggregate 11 is moved to the water surface by the large amount of water that has moved to the water surface together with the aggregate 11 and is near the water surface. In many cases, the light material 12 that is formed on the surface of the aggregate 11 flows down into the water due to this flow, but there is an upflow due to the movement of the conveyor 5 for carrying out the aggregate and a downflow that flows down from the air. The light substance 12 can be retained by the There is a phenomenon that the product is discharged as product aggregate while it remains on top.

Therefore, in the present invention, in order to eliminate this phenomenon, the surface of the aggregate carrying-out conveyor 5 is pressurized with the pressure water jetted from the first nozzle row 6 at a position near the surface where the aggregate carrying-out conveyor 5 reaches the water surface. A water curtain 6a is formed on the top to block entrainment of the light substance 12 in the aggregate 11 so that the light substance 12 is separated from the aggregate 11 and retained just below the water surface. The pressure water 7a ejected from the nozzle row 7 forcibly creates a flow that drives into the tail portion located below the water surface of the inclined trough 9 having a U-shaped cross section with the top portion located above the water surface, The scraper 8a that slides on the bottom surface of the slanting trough 9 of the slanting conveyor 8 for discharging a light substance that rotates in the direction opposite to the rotating direction of the conveyor 5 for discharging aggregates and moves to the top side is moved out of the classification tank 1. Light material mixed in aggregate 11 by discharging It is to remove the quality 12.

At this time, a settling path 2 is formed by a partition plate 1b installed in the classification tank 1 so as to face the charging port 1a as in the illustrated embodiment, and the settling path 2 is formed in the settling path 2 above the partition plate 1b. When the overflow weir 3 is provided adjacent to and in communication with the overflow gutter 4, the lighter material 12 that has floated up in the settling channel 2 and is lighter than water flows to the overflow gutter 4 through the overflow weir 3. Therefore, most of the light substances 12 that are heavier than water are retained just below the water surface by the water curtain 6a made of the pressure water that is transferred by the aggregate carrying-out conveyor 5 and is ejected from the first nozzle row 6. . On the other hand, when the settling path 2 is not formed by the partition plate 1b installed opposite to the input port 1a, it is input from the input port 1a and floats before reaching the tail portion of the aggregate transport conveyor 5. The light substance 12 that is lighter than water may be manually scooped and discharged.

Thus, the aggregates 11 from which the light substances 12 have been removed and which have been transferred onto the water surface by the aggregate conveying conveyor 5 are dropped to a predetermined position outside the classification tank 1 and accumulated as product aggregates.

In such an operation, the size of the aggregate 11 in which the light substance 12 is introduced from the introduction port 1a is changed, or the first nozzle row 6 is changed depending on the kind of the light substance 12 mixed. It is needless to say that the light substance 12 can be more effectively removed by adjusting the pressure and flow rate of the pressure water ejected from the second nozzle row 7 and the pressure water and the flow rate of the pressure water 7a ejected from the second nozzle row 7.

[0024]

As described above in detail, in the method and apparatus for removing a light substance mixed in the aggregate according to the present invention, the aggregate mixed with the light substance is charged into the water in the classification tank through the charging port at one end. Then, the light substances that have settled down and the aggregate are placed on the inclined aggregate carrying-out conveyor where the tail part is placed in the water immediately below the inlet and the top part is located on the water surface, and then the outside of the classification tank. At the time of discharging, a water curtain is formed by the pressure water jetted from the first nozzle row at a position near the surface where the aggregate carrying-out conveyor reaches the water surface to separate the light substances from the aggregates and retain them just below the water surface. The substance is driven out by the pressure water ejected from the second nozzle row into the tail portion located below the water surface of the inclined trough that has a U-shaped cross section with the top portion located above the water surface, and is used for carrying out the aggregate. Light material that rotates in the opposite direction of the conveyor Since it is to be discharged to the outside of the classification tank by a scraper that slides on the bottom surface of the inclined trough of the output inclined conveyor and moves to the top side, the conventional method for removing light substances using only buoyancy Not only lighter substances that are lighter than water, but also lighter substances that are not suitable as aggregates, such as strips of driftwood that contain enough water, roots of plants, pumice stones, and pieces of plastic or sheet that sink in water. Since the aggregate can be efficiently removed and the light substances are removed by being put into water, the aggregate is rewashed, so that it is possible to obtain an aggregate having a very high quality.

Then, a partition plate is installed in the classification tank so as to face the charging port to form a settling path, and a light material that has floated into the settling path from an overflow weir provided adjacent to the upper part of the partition plate. When a substance is spilled and discharged, the removal of light substances is divided into the removal of light substances lighter than water and the removal of light substances heavier than water, so the removal efficiency of light substances is extremely high. There is also the advantage of becoming higher.

Further, the device for removing a light substance mixed in the aggregate according to the present invention has a simple structure, so that it can be manufactured inexpensively and easily, and the structure as described in claims 4 to 8 is added. By doing so, various excellent effects can be added.

The industrial value of the method and apparatus for removing a light substance mixed in the aggregate according to the present invention, which has various effects as described above, is very great.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional explanatory view schematically showing one embodiment of an apparatus of the present invention suitable for carrying out the method of the present invention.

FIG. 2 is a plan view of FIG.

3 is a cross-sectional explanatory view taken along the line AA in FIG.

4 is a cross-sectional view taken along the line BB in FIG.

5 is a cross-sectional view taken along the line CC in FIG.

[Explanation of symbols]

 1 Classification tank 1a Input port 1b Partition plate 2 Settling path 3 Overflow weir 4 Overflow gutter 5 Conveyor for carrying out aggregate 6 First nozzle row 6a Water curtain 7 Second nozzle row 7a Pressure water 8 Inclined conveyor for light material discharge 8a Scraper 9 Inclined trough 9a Backflow preventer 9b Guide plate 10 Aggregate input device 10a Aggregate loading conveyor 10b Hopper 10c Feeder 11 Aggregate 12 Light substance 13 Side skirt 13a Fixed plate 13b Abutment piece 14 Water supply pipe

Claims (8)

[Claims] 1. An aggregate (11) in which a light substance (12) is mixed is poured into water in a classification tank (1) through an inlet (1a) at one end, and the light substance (12) and the aggregate that have settled down. (11) and the tail part is the inlet
(1a) Placed on an inclined aggregate carrying-out conveyor (5) with the top part positioned above the water surface in the water directly below, and the classification tank
(1) When discharged to the outside, a water curtain (6a) is formed by pressure water ejected from the first nozzle row (6) at a position near the aggregate carrying-out conveyor (5) to reach the water surface, and a light substance ( 12) aggregate (1
It is separated from 1) and stays just below the water surface, and the first nozzle row
The second nozzle row located closer to the inlet (1a) than (6)
Light material (12) is added to the tail part located below the water surface of the inclined trough (9) which has a U-shaped cross section with the top part located above the water surface by the pressure water (7a) ejected from (7). Drive to the top part side by sliding on the bottom surface of the inclined trough (9) of the inclined conveyor (8) for discharging a light substance that rotates in the direction opposite to the rotating direction of the conveyor (5) for discharging aggregate. A method for removing light substances mixed in aggregates, characterized in that the scrapers (8a) are moved to the outside of the classification tank (1). 2. A partition plate (1b) is installed in the classification tank (1) so as to face the charging port (1a) to form a sedimentation channel (2), and the partition plate (1b) is formed.
The light substance mixed with the aggregate according to claim 1, wherein the light substance (12) floating in the sinking channel (2) is overflowed and discharged from an overflow weir (3) provided adjacent to the upper part. Removal method. 3. An aggregate (11) containing a light substance (12) at one end
The classification tank (1) provided with the input port (1a) of the above, and the light material that has settled because the tail part is located in the water immediately below the input port (1a) and the top part is located above the water surface ( The inclined aggregate conveyor (5) for placing the aggregate (11) mixed with 12) on its upper surface and transferring it to the top part and discharging it to the outside of the classification tank (1), and the aggregate discharge Conveyor (5) for ejecting pressured water at a position near the water surface to convey the aggregate
(5) First nozzle row (6) forming a water curtain (6a) on the surface
And a second nozzle row for ejecting pressure water (7a) that pushes back the light substance (12) separated from the aggregate (11) by the water curtain (6a) and staying just below the water surface toward the charging port (1a) side. (7), the top part is on the surface of the water, and the tail part is the conveyor for carrying out the aggregate (5)
The aggregate carrying-out conveyor (5) is positioned below the water surface on the input port (1a) side from the position reaching the water surface, and the rotation direction of the aggregate carrying-out conveyor (5) is When the slant conveyor (8) for discharging a light substance provided with the scraper (8a) which rotates in the opposite direction and the scraper (8a) of the slant conveyor (8) for discharging a light substance move from the tail part to the top part An inclined trough with a U-shaped cross section that slides on the bottom surface
(9) and the tail portion of the inclined trough (9) and the position where the pressurized water (7a) is jetted from the second nozzle row (7), and is jetted from the second nozzle row (7). The light substance (12) staying just below the water surface pushed back to the inlet (1a) side by the pressurized water (7a) is transferred to the tail portion of the inclined trough (9) and the inclined conveyor (8) for discharging the light substance. A device for removing light substances mixed in aggregate, comprising: a backflow preventer (9a) for guiding between the tail part and the guide plates (9b) on both sides. 4. Adjacent to the upper part of the partition plate (1b) in the settling path (2) formed by the partition plate (1b) installed facing the charging port (1a) in the classification tank (1). Then, the overflow weir (3) for overflowing the light substance (12) floating in the settling path (2) is overflow gutter.
The device for removing a light substance mixed with an aggregate according to claim 3, which is provided in communication with (4). 5. The tilt trough (9) according to claim 3 or 4, wherein at least a bottom surface of the tail portion located below the water surface is made of a mesh capable of allowing water to pass to the inlet (1a) side. A device for removing light substances mixed in aggregates of. 6. The removal of light substances mixed in the aggregate according to any one of claims 3 to 5, wherein the aggregate carrying-out conveyor (5) is a belt conveyor, a chain conveyor or a net conveyor. apparatus. 7. The device for removing a light substance mixed in an aggregate according to claim 3, wherein the backflow preventer (9a) and the guide plates (9b) on both sides have flexibility. 8. The guide plates (9b) on both sides are made of mesh.
The removal device of the light material mixed in the aggregate according to any one of 1 to 7.