KR20090027436A - Specific gravity sorting device and method for circulating aggregate using vortex - Google Patents

Abstract

The present invention relates to a specific gravity sorting device and a method for circulating aggregates using vortices, and more particularly, to supply circulating aggregates classified as construction waste, and to form a rising vortex and a falling vortex separately or simultaneously to form a circulation having various densities. The present invention relates to a specific gravity sorting device for circulating aggregates using vortices and a method for selecting and predicting a moving path of aggregates.

The present invention has a vortex tank (10) provided with an inlet (11) on the lower side, the outlet 12 protruding to a predetermined height from the center;

A supply tank 20 connected to the inlet 11 and supplying a fluid to the vortex tank 10;

A storage tank 30 connected to the pump 31 for supplying water to a portion of the vortex tank 10 and connected to supply the water through the pump 21 to the supply tank 20;

The outlet 12 and the storage tank 30 is characterized in that it consists of a classifier 40 for classifying the suspended matter with water.

Description

Specific gravity sorting device of the circulating aggregate using a swirl and that method}

The present invention relates to a specific gravity sorting device and a method for circulating aggregates using vortices, and more particularly, to supply circulating aggregates classified as construction waste, and to form a rising vortex and a falling vortex separately or simultaneously to form a circulation having various densities. The present invention relates to a specific gravity sorting device for circulating aggregates using vortices and a method for selecting and predicting a moving path of aggregates.

Construction waste is a mixture of aggregates of density 2.6 and concrete of density 2.3 and lower. In this way, since the waste concrete has various densities and shapes, it can be separated in various ways. Among the currently used separation methods, there are the following methods for separating foreign substances from waste concrete.

Hand picking refers to mineral beneficiation by attraction. In order to save labor costs, the company has recently decided to switch to mechanical methods such as heavy screening instead of screening personnel.

Gravity separation is the difference in specific gravity between colored minerals and waste concrete and waste building materials or useful minerals. In the non-radiative beneficiation, there is also a wet method using hydraulic power and a dry method using wind power.

Figure 1 shows a jig (jig) which is a kind of conventional specific gravity beneficiator. When the ore is fed onto a screen fixed in the tank and the water is moved up and down with the piston on the opposite side, the particles having a lower specific gravity move to the top and the particles having a higher specific gravity move to the lower side to separate them. Can be. The specific particle size of beneficiation beneficiation is 2 ~ 20mm for assembly and 200mesh for fine grain. The use of such wind and hydro beneficiation can effectively remove low-density wood, waste plastics, etc. contained in construction waste.

In magnetic separation, magnetic minerals and non-magnetic minerals are separated by applying a magnetic field using the difference in magnetic properties. Ferromagnetic magnetite is a beneficiation method that can be easily separated from non-magnetic waste concrete and applied to magnetite or sand iron. Although it is an effective method for removing the steel fragments contained in the construction waste, especially the steel reinforcement contained in the waste concrete, it is difficult to screen according to specific gravity.

Heavy media separation is a type of specific gravity beneficiation that produces a liquid (heavy liquid) with a medium specific gravity between useful minerals in the ore and waste concrete. Concrete with high impurity and high specific gravity is settled and separated.

In the case of making a heavy liquid, a heavy liquid of about 0.5 mm is poured into water and suspended in water. Suspensions in water to make a medicinal solution are called materials for suspension, usually a mixture of Fe-Si alloys, pyrite, galena, Fe-Si and magnetite.

In the electrostatic separation method, the electrostatic separator is divided into a forward induction type (eg Blake-Moorsher type) and a corona discharge type (eg Huff type). FIG. 2A shows the former and FIG. 2B shows the latter. In the former case, when a small ore is supplied to the surface of the metal roll charged at high pressure by induction, the conductive mineral is charged and bounced out by the same sign by conduction, but the non-conductive mineral falls by gravity without being charged.

In the case of the corona discharge type, when a thin metal wire or comb-shaped peaks charged with high pressure are placed in a straight line near the grounded roll, the electric power is injected in the direction of the roll. The electricity is then sensitized by the electricity, but the received electricity flows directly to the roll, which is slightly affected or dropped in an insensitive state, and the non-conductive mineral is attached to the roll face charged with the opposite of the metal wire. It has the disadvantage of being washed off.

Flotation is a floating sorter as an example of the flotation sorter, as shown in FIG. 3, which is used as a flotation agent in a mixed aqueous solution of finely divided ore, that is, a mineral containing pulp. Is made hydrophobic selectively, and then air is generated by blowing air into a liquid solution containing a foaming agent such as pine oil, and the sufficiently hydrophobic minerals adhere to the bubbles and float on the liquid surface. Only minerals can be harvested. Hydrophilic minerals, on the other hand, do not adhere to bubbles and remain in the mineral solution and are separated and collected as a guide. Floating method is widely used as beneficiation method of oxide mineral, silicate ore, non-sulfurized ore, coal, etc., but concrete is difficult to apply because it is hydrophilic.

Figure 4 shows the basic concept of foreign matter removal method (new construction technology 126) through a water tank that is practically used in the country. In this method, the crushed waste concrete is introduced into the tank, and the injected waste concrete is moved to the opposite side by the conveyor, and bubbles are generated at the bottom of the conveyor to raise foreign substances having low specific gravity, and the water is perpendicular to the flow of aggregate. It is a way to circulate and remove floating foreign substances.

This method is known to be effective in removing foreign matters having a low specific gravity, such as waste wood, waste vinyl, waste styrofoam, etc., but has a disadvantage in that only the very low specific gravity can be removed due to the low floating force.

Conventional flotation screening can be classified in two ways. One simply relies on the buoyancy of the water, which causes the plant to grow because it takes time to allow injury due to buoyancy. The improved method is to increase bubbles by generating bubbles, but the existing flotation method has a specific gravity approaching 1.0 because of low floating force, limited residence time, and the same movement path with aggregate. It is difficult to float.

The present invention has been made to solve the above-mentioned drawbacks. The present invention provides risen and falling vortices in a cylinder having different diameters of upper and lower portions, and the rising and falling vortices are provided respectively or simultaneously to the waste concrete. It is to provide a structure and a method for making the separated relatively light weight material by floating to separate.

In the present invention, since the lifting force generated by the circulation of the vortex is used, the floating force is much higher than that of the conventional simple buoyancy method or the bubble buoyancy method. As a result, a specific gravity of 1.0 or more is made rich and classified.

The present invention is to separate the foreign matter contained in the circulation aggregate by using the rising current (Rising Current) and the vortex (Vortex) or falling vortex,

The rising vortex allows the suspended material to float without sedimentation of the specific gravity of 1.0 or more to be settled in the direction of gravity. It is used to remove the floating obstacle caused by the drop of water.

Ascending vortices are very effective for the separation of circulating aggregates (solid materials) due to their high specific gravity.The descending vortices have a lot of transport energy compared to the movement of stationary or normal fluids. The removal process provides a very suitable technical environment.

The present invention provides the effect that the floating force is very large compared to the conventional simple buoyancy method or bubble buoyancy method because it uses the lifting force generated by the circulation of the vortex.

The present invention provides the advantage that the aggregate and the foreign matter is introduced in the same but different concentration paths within the foreign matter classification to make the specific gravity more than 1.0, and the size of the plant is greatly reduced compared to the basic method and the residence time is also shortened. It is to provide an effect that can be done.

The present invention is to separate the foreign matter contained in the circulating aggregate using the rising vortex and the falling vortex, the rising vortex helps to separate the solid material by a high specific gravity, the falling vortex has a very large transport energy, so that various materials It is to remove the foreign matter from the mixed construction waste to enable effective removal of the foreign matter.

According to the accompanying drawings, preferred embodiments of the present invention will be described in detail.

In the prior art, by continuously dropping a mixture in the same place, it is often prevented that floating is prevented by the added mixture after the moment of foreign matter floating in the previously added mixture, and the foreign substance which is light in specific gravity is not floating and is loaded at the bottom like other materials. Occurs.

In order to eliminate this phenomenon, a method of continuously changing the feeding position and a method of allowing the injected mixture to move horizontally can be considered. The above method can be done by mechanically moving the inlet, but practical installation is not simple. On the other hand, the method described later can be installed without difficulty since it is necessary to form a rapid horizontal movement of the fluid. The most efficient is the method of forming vortices (rising and falling).

In the prior art, the construction waste is continuously loaded into the separating apparatus and loaded into the conveying apparatus, which removes the foreign substances during the conveyance because the foreign substances are loaded into the conveying apparatus without being completely removed.

However, since the construction waste loaded on the conveying device cannot be subjected to rapid vibration, its movement is static, and it is not easy to separate the foreign matter effectively upwards.

To separate any material, the movement of each material must be more reasonably constructed to maximize its efficiency. In the existing floating-type technology developed to sort out various foreign substances mixed with construction waste, the moving direction of the foreign matter to be removed, the moving direction of the circulating aggregate to be used, and the fluid used to remove the foreign matter (sometimes including gas) The directions of movement of are interfered with each other.

That is, the moving line of the foreign matter, the moving vector of the moisture, and the moving vector of the aggregate are designed to form a right angle. In this way, since the movement of the foreign matter to be suspended is interfered by the movement of other substances, the floating of the foreign matter is not easy and the efficiency is inevitably reduced.

Therefore, in order to improve the floating force, the floating vector of the foreign material and the fluid moving vector are the same, and the floating force of the foreign material is increased. It is preferable to constitute.

The present invention is to separate the foreign matter contained in the recycle aggregate by using the rising current (Rising Current) and the vortex (Vortex) or falling vortex.

The rising vortex allows the suspended material to float without sedimentation of the specific gravity of 1.0 or more to be settled in the direction of gravity. It is used to eliminate the floating obstacle caused by the drop of water.

Ascending vortices are very effective for the separation of solid materials by high specific gravity, and because descending vortices have very high transport energy compared to stationary or normal fluid movement, Provide a highly suitable technical environment for the process.

The theoretical background of the rising and falling vortices is as follows.

Rising Current of Water has a density of about 1,700 times higher than water vapor, so if the same conditions move a solid object by flow, the movement by water is much greater. This method has proven its effectiveness in various plants, and typically, to transport coal particles, coal particles are mixed with water to make a slurry, which is then transported through a pipe, and various ashes generated from a boiler are pulverized There is a method for transferring to. As such, the transport of objects by fluid is a very efficient way and is much more efficient than by gas.

When the fluid is used as the transport medium, the direction of movement of the fluid is generally set in the horizontal or gravity direction of gravity. This is because high energy is required when the fluid and the solid in the fluid are simultaneously transported in the vertical direction.

However, in the case of the separator which separates a certain specific gravity from a mixture of several mixtures as in the present invention, it is preferable to set the moving direction of the fluid in a direction opposite to gravity, that is, use a rising current. The low specific gravity caused by the rising vortex associated with the buoyancy can easily make it rich, while the relatively high proportion will settle regardless of the rising vortex or buoyancy.

Because the Earth rotates, all objects moving on the earth are affected by this rotation, and objects moving in the northern hemisphere are forced to the right in the direction of movement and to the left in the southern hemisphere, which is called the Coriolis Force. Because of this power, when water descends from the sink of our home, it turns counterclockwise in the northern hemisphere and clockwise in the southern hemisphere.

As the water is rotated by the action of the centrifugal force as described above, the rotating water is pushed outward to create an air column in the center of the water, the upper portion of the water pressure is small, the lower portion of the water pressure is large. This behavior of the fluid is called Vortex.

These vortices often occur in their natural state, in the form of a whirlwind for gases and vortices for water. Small tornadoes can be an interesting sight, but large tornados, like tornadoes, can cause huge damage to property or life. A whirlwind in the sea forms a huge column of water, also known as a dragon rise. This whirlwind is caused by a sudden change in air pressure, which is based on the same vortex as the sudden release of water in a bottle.

Vortex phenomena can be basically divided into forced and free vortices. Forced vortex is formed by external force of water, and free vortex means vortex that occurs naturally when large amount of water passes through narrow gap.

FIG. 5A shows the forced vortex flow, and FIG. 5B shows an example of the free vortex flow.

The streamlines seen from the free surface of the fluid are circles with the same center. To visualize the flow, the cork floats in liquid and appears as a diagonal rectangle. In both flows the fluid particles consist of vortices along a circular path, but the size is very different.

5A corresponds to a forced vortex. Here, the liquid rotates at a constant angular velocity as if it were a solid by the action of the rotating vessel and viscosity. Thus the only velocity component is given by which increases with radius. Following the path of 1-2-3-4-5, the flow is rotatable because the cork rotates counterclockwise, pointing angularly in the counterclockwise direction.

5b corresponds to the free vortex present in the non-viscous liquid. The only velocity component is proportional to the inverse of the radius. That's it. Following the path of 1-2-3-4-5, the cork points in the direction of zero vortex and maintains its direction, so the flow is non-rotating.

In the case of cyclone separators which are generally used for separating powders, the center is an example of free vortex. However, in the narrow area of the inlet part of the separator, the flow is approximated by forced vortices because of the driving effect of the inlet gas. The drainage in the bathtub or sink is another example of free vortex because the velocity in each direction increases as the drain hole approaches.

An example of the actual appearance of the forced vortex is caused by the rotary blades installed at the bottom. During forced vortices, all water particles with forced vortices have the same angular velocity about the central axis.

Free vortex refers to a vortex with a narrow, vertically long air layer centered on the flow of large amounts of water naturally. In this free vortex, the streamline is concentric and the velocity changes in inverse proportion to the radius of rotation.

6 shows an apparatus for the ascending vortex composition of the present invention, wherein the vortex tank 10 forms an inlet 11 at the bottom with an inverted conical drum and an outlet 12 at the center of the inlet 11. .

On one side of the outlet 12, a supply tank 20 having a height higher than that of the vortex tank 10 is installed, and the vortex tank 10 is connected through the storage tank 30 and the pump 31, and is supplied. The tank 20 and the storage tank 30 are connected through the pump 21 to supply the water of the storage tank 30.

The outlet 12 is open at a position protruding at a predetermined height from the center of the vortex tank 10, and the fractionator 40 is installed at one portion of the outlet 12 and the storage tank 30 together with the water. After the discharged suspended matter is separated to supply the water discharged to the outlet 12 to the storage tank 30 to be stored.

Substances floating in water move with the flow of water. The transport capacity of this solid material in water is so strong that it causes a great change in the natural environment.

The present invention maximizes the buoyancy by using this powerful transport capacity of water.

When the composition of the rising vortex is operated only by the pump 21, as shown in FIG. 7, the outlet inlet 11 is formed at the lower portion of the vortex tank 10 to form the outlet 12 at the center of the horizontal and vertical directions. By operating the pump 21 and supplying a water direction to the supply tank 20 connected to the lower side of the vortex tank 20, an upward vortex of water flowing from the lower side of the vortex tank 10 to the upper side is formed.

The flow of fluid in the closed process is pump 21 → supply tank 20 → bottom inlet 11 of vortex tank 10 → vortex tank 10 bottom outlet 12 → fractionator 40 → It is formed in the order of the storage tank (30).

At this time, the strength of the rising vortex is proportional to the head head of the supply tank 20 and the head head of the vortex tank 10, and thus increases as the capacity of the pump 21 is increased. In this case, when the height difference between the head of the supply tank 20 and the upper side of the outlet 12 is large, free vortex is naturally formed in the vortex tank 10, and the rotation direction thereof is counterclockwise. Since the movement of the fluid on the upper side of the vortex tank 10 has a higher velocity at the center than the outer part by the free vortex, the suspended matter in the fluid is not settled by its own weight, but the outlet 12 with movement of the fluid. Will flow into.

If there is no horizontal movement in the tank and only vertical movement, the first introduced material may not be floated because it is interrupted by being added later because there is not enough space to float. At this time, if the movement in the horizontal direction is properly given, it is possible to create a floating space of the material. The flow of fluid with the largest horizontal transport capacity is the vortex.

The vortex was formed by operating the pump 31 connected to the outermost part of the vortex tank 10, as shown in FIG. 8, when only the pump 31 was operated. At this time, the forced vortex is formed in the vortex tank 10, and an inclined head surface having a high head and low head in the center is formed.

In addition, although the amount of water flows from the vortex tank 10 to the supply tank 20 through the inlet 11 of the vortex tank 10 by the quantity of water introduced into the pump 31, the quantity of water introduced into the vortex tank 10. The amount of discharge of the outlet 12 and the outlet reaches an equilibrium state.

Therefore, the flow of water in the equilibrium state is supplied to the vortex tank 10 by the pump 31 and again to the sorter 40 through the outlet 12 formed at the lower side of the vortex tank 10, and then again to the storage tank. It is formed in the order of 30.

In the equilibrium state, the vortex in the vortex tank 10 rotates almost horizontally only, but a slight rise in the upper portion of the vortex tank 10 because the water flowed in from the pump 31 is discharged to the outside through the outlet port 12. Since the vortex is formed and the vortex in the tank is a forced vortex, the fluid flow on the surface part has the same angular velocity, so it is difficult to sink because the velocity is high in the outer part (position in the circle in the figure), but the velocity increases toward the center part. At the very center (the location in the circle in the figure), the velocity is zero, making it easier to settle.

As described above, it was found that the rising vortex may be formed by the pump 21, and the vortex may be formed by the pump 31. Therefore, when the pumps 21 and 31 are simultaneously applied, the rising vortex and the falling vortex It can happen at the same time.

When the pumps 21 and 31 are applied at the same time through the formation of the rising vortex shown in FIG. 9, the movement of the fluid in the vortex tank 10 shows a form in which free and forced vortices are mixed. The order of the vortex tank 10 forms a head surface having a steep slope with a low central portion and a high outer portion, and the movement of the fluid on the upper side shows almost the same speed in the intermediate form between the forced vortex and the free vortex. .

In addition, the movement of the fluid by the free vortex is formed by the fluid introduced from the bottom, the upward flow converts the horizontal movement of the forced vortex in the vertical direction slightly to form a rising vortex as a whole. The rising vortex is formed along the periphery of the outlet port 12 as shown in FIG. 10 when both pumps 21 and 31 are operated.

However, if the diameter of the outlet 12 is not large enough to discharge all the water flowed in, the water introduced into the upper portion descends through the outer portion of the vortex tank 10 to form a descending vortex as shown in FIG. 10. do. At this time, since the lower portion of the vortex tank 10 has a lower cross section, the lower vortex should have a higher rotational speed as the lower vortex, but the overall vortex formation is a forced vortex adjusted by the flow rate of the pump 31, thereby maintaining almost the same speed. Doing.

The rising and falling vortices thus formed may be expressed as shown in FIG. 11 when both pumps 21 and 31 are operated. The rising force due to the rising vortex is determined by the quantity of water introduced from the bottom of the vortex tank 10. Since the majority of the quantity of the introduced water flows out through the outlet 12 and the falling vortex is formed by a portion of the quantity of the rising vortex Is larger than the size of the falling vortex.

In general, the flows of the rising and falling vortices formed in the vortex tank 10 are as shown in FIG. 12 when both the pumps 21 and 31 are operated.

In order to examine the possibility of separation of construction wastes, which are mixtures having various specific gravity, by using the present invention, each of three kinds of objects having a specific gravity of less than 0.8, a specific gravity of 0.8 to 1.4, and a specific gravity of 1.4 or more is added. We looked at the behavior of, and will be described in detail through the following experimental example.

Experimental Example 1 Behavior of Objects Under Specific Gravity 0.8

Since objects having a specific gravity less than 0.8 are very low in specific gravity, they float immediately after the injection, and when all the pumps 21 and 31 are operated in FIG. 13, when a solid substance having a different specific gravity is dropped, a1 and a2 are present in the vortex tank 10. In this case, the discharge occurs along the path of a3.

When moving from a1 to a2 there is not much rotation, but when moving from a2 to a3 it moves with a lot of rotation, and the results of such separation efficiency are shown in Table 1.

Table 1 Separation Efficiency Experiment Results

Specific gravity of the object Input quantity (l) Separation amount (l) Separation Efficiency (%) 95% separation time (sec.) Ejected device 0.2 One One 100 28 Outlet 0.4 One One 100 90 Outlet 0.6 One One 100 132 Outlet

Experimental Example 2 Behavior of an Object with Specific Gravity 0.8 to 1.4

As shown in FIG. 14, when the pumps 21 and 31 are all operated, the path in the case of dropping solid materials having different specific gravity,

Objects having a specific gravity of 0.8 to 1.4 are slightly different depending on the specific gravity, but do not immediately descend or float upon entering the water surface of the vortex tank 10, but rotate the outer portion of the tank according to the vortex formed in the vortex tank 10.

Since the vortex formed in the outer portion of the vortex tank 10 is a descending vortex as described above, the objects gradually descend, but the lower part of the vortex tank 10 is lower because the cross section is smaller than the upper portion and the rising vortex is formed. The object naturally meets the rising vortex and rises faster than when it descends. The raised object is rapidly drained when it reaches the upper surface of the outlet 12.

Of course, although there is a difference depending on the size of the rising vortex, it was confirmed experimentally that the specific gravity of about 1.0 ~ 1.4 can also be separated. As shown in FIG. 14, the moving path of the object may be represented by b1 → b2 → b3 → b4 → b5 → b6. Rotation from b1 to b4 is slow in the movement path, but rotation from b4 to b6 is very fast, and the separation efficiency test results are shown in Table 2.

Table 2 Separation Efficiency Experiment Results

Specific gravity of the object Input quantity (l) Separation amount (l) Separation Efficiency (%) 95% separation time (sec.) Ejected device 0.8 One 0.90 90 30 Outlet 1.0 One 0.95 95 32 Outlet 1.2 One 0.95 95 43 Outlet 1.4 0.80 0.73 91 50 Outlet

Experimental Example 3 Behavior of Objects with Specific Gravity 1.4

FIG. 15 shows the movement path of the solid material in the vortex tank 10 when the pumps 21 and 31 are both operated and the solid material having different specific gravity is dropped.

Heavy objects having a specific gravity of 1.4 or more are relatively less affected by the vortex formed in the vortex tank 10, and the smaller the specific gravity is, the smaller the influence is. Therefore, c1 to c4 are simple as shown in the moving hardness 15 of the aggregate having a high specific gravity.

Since the specific gravity is high, it has a high potential energy, so when it enters into the fluid of the vortex tank 10, it does not immediately float, but sinks quickly, but gradually sinks while receiving horizontal movement under the influence of vortex, and separation efficiency The experimental results are shown in Table 3.

Table 3 Separation Efficiency Experiment Results

Specific gravity of the object Input quantity (l) Separation amount (l) Separation Efficiency (l) 95% separation time (sec.) Ejected device 1.8 One 0 0 10 Vortex Tank Bottom 2.0 One 0 0 8 Vortex Tank Bottom 2.3 One 0 0 5 Vortex Tank Bottom

The present invention can be applied in various ways to separate the foreign matter contained in the recycled aggregate using the rising vortex and the falling vortex by supplying the waste concrete.

1 is an installation state diagram for a conventional jig specific gravity sorter

Figure 2a is a state diagram for the electric charge induction type of the conventional electrostatic separator

Figure 2b is a state diagram for the installation of the corona discharge of the conventional electric selector

3 is an installation state diagram for a conventional floating sorter

Figure 4 is another installation state for the conventional floating sorter

Figure 5a is a state diagram for a general forced vortex (rotational)

Figure 5b is a state diagram for a typical free vortex (non-rotating)

Figure 6 is an installation state diagram for the rising vortex composition of the present invention

7 is an installation state diagram for the composition of the upward flow of the present invention

8 is an installation state diagram for the composition of the vortex of the present invention

9 is an installation state diagram for the composition of the rising vortex of the present invention

10 is a state diagram for the composition of the falling vortex of the present invention

11 is an installation state diagram for the composition of the rising and falling vortex of the present invention

12 is a state diagram showing the fluid movement path of the present invention

13 is an installation state showing the behavior of the mixture less than the specific gravity 0.6 of the present invention

14 is an installation state showing the behavior of the mixture having a specific gravity of 0.6 to 1.4 of the present invention.

Figure 15 is an installation state showing the behavior of the mixture of specific gravity 1.4 or more of the present invention

[Description of Symbols for Main Parts of Drawing]

10: vortex tank 11: inlet

12: outlet 20: supply tank

21, 31: pump 30: storage tank

40: classifier

Claims (6)

A vortex tank (10) provided with an inlet (11) on the lower side and an outlet (12) protruding at a predetermined height from the center; A supply tank 20 connected to the inlet 11 and supplying a fluid to the vortex tank 10; A storage tank 30 connected to the pump 31 for supplying water to a portion of the vortex tank 10 and connected to supply the water through the pump 21 to the supply tank 20; The specific gravity sorting device of the circulating aggregate using the vortex, characterized in that consisting of a sorter (40) for connecting the outlet (12) and the storage tank (30) and classifies the suspended matter with water. Supplying water from the storage tank 30 to the supply tank 20 through the pump 21; Supplying water from the supply tank 20 to the vortex tank 10 through the inlet port 11 to form a rising vortex; A predetermined amount of building waste is supplied to the vortex tank (10) and sorted by the rising vortex to separate the suspended matter with the water through the outlet (12); Floating material is sorted through the classifier 40 connected to the outlet 12 and the water is supplied to the storage tank 30 to sort the circulating aggregate by moving the fluid. Specific gravity screening method. Supplying water from the storage tank 30 to the vortex tank 10 through the pump 31 to form a descending vortex by force; A predetermined amount of construction waste is supplied to the vortex tank 10 and separated by the vortex to separate the suspended matter together with the water through the outlet 12; Floating material is sorted through the classifier 40 connected to the outlet 12 and the water is supplied to the storage tank 30 to sort the circulating aggregate by moving the fluid. Specific gravity screening method. Supplying water from the storage tank 30 to the supply tank 20 through the pump 21 to form a rising vortex; Supplying water from the storage tank 30 to the vortex tank 10 through the pump 31 to form a descending vortex; Generating rising and falling vortices at the same time and supplying a predetermined amount of building waste to the vortex tank (10) to separate the suspended matter with the water through the outlet (12); Floating material is sorted through the classifier 40 connected to the outlet 12 and the water is supplied to the storage tank 30 to sort the circulating aggregate by moving the fluid. Specific gravity screening method. The method of claim 1, Vortex tank 10 is an inverted conical drum with an inlet 11 in the lower portion to form a specific gravity outlet of the circulating aggregate using a vortex, characterized in that the outlet (12) protruding to a predetermined length in the center. The method of claim 1, Supply tank 20 is for supplying fluid to the vortex tank 10, the specific gravity sorting device of the circulating aggregate using vortex, characterized in that the free vortex is formed by higher than the water level of the vortex tank (10).

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