WO2008010621A1

WO2008010621A1 - The recycle system and method for paint can wastes

Info

Publication number: WO2008010621A1
Application number: PCT/KR2006/003888
Authority: WO
Inventors: Yong-Saeng Bae
Original assignee: Yong-Saeng Bae
Priority date: 2006-07-21
Filing date: 2006-09-28
Publication date: 2008-01-24
Also published as: KR100809480B1; KR20080008700A

Abstract

The present invention relates to a recycling system of waste paint canisters, more particularly, to a recycling system of waste paint canisters and a method thereof, which can only separate recyclable metals by finely crushing the waste paint canisters and removing paint by means of organic solvent. The present invention is characterized by recycling system of waste paint canisters comprising a crushing section for crushing waste paint canisters into fragments having a predetermined size, a magnetic force selecting section for transporting the fragments of the waste paint canisters crushed at the crushing section and for selectively removing only paint powder partially separated from the fragments of the paint canister by means of a magnet, a washing section including a washing tank for washing the fragments of the paint canisters partially removed of the paint powder at the magnetic force selecting section with organic solvent, and a transporting device disposed at a lower end of the washing tank for transporting the washed fragments of the paint canisters and for preventing the organic solvent from being collected therein, and a vibration magnetic force selecting section for selectively separating the organic solvent and the paint from the fragments of the paint canisters transported from the washing section.

Description

THE RECYCLE SYSTEM AND METHOD FOR PAINT CAN WASTES

Technical Field

The present invention relates to a recycling system of waste paint canisters, more particularly, to a recycling system of waste paint canisters and a method thereof, which can only separate recyclable metals by finely crushing the waste paint canisters and removing paint by means of organic solvent.

Background Art

Paint pertains to synthetic polymer composite, and is not decomposed at a natural state.

Also, the paint contains components harmful to the human body or animals and vegetables, so that it can cause environmental pollution if it is discarded at random.

In general, the canister for accommodating the paint has been generally made of metal, especially, it has been made by using iron. Accordingly, it is required to recycle the waste paint canisters so as to recycle iron.

However, in case of the waste paint canisters stuck by the paint, it is classified as designated wastes, so that it cannot be washed at random and cannot be discarded together with the daily garbage. It has been legally regulated that the waste paint canisters should be collected by the designated collector and be treated so that it can be recycled.

In general, it is required to remove the paint stuck to the inside of the waste paint canisters and separate the metal only to recycle it. Otherwise, the paint is required to be removed separately at the time of the recycling of the metal, or it reduces the quality of the metal obtained.

With regard to the removal method of the paint, the inside of the waste paint canisters is to be washed for every piece, or it should be burned. However, time and expense are dissipated in washing the inside of the waste paint canisters, and a great volume of harmful material is produced in the burning to thereby cause environmental pollution.

Disclosure of Invention Technical Problem

Accordingly, the present invention was devised to solve such conventional problems, and a primary object of the present invention is to provide a recycling system of the waste paint canisters, which can reduce the time and expense required in the removal of the paint by using a method of washing fragments of the paint canisters with organic solvent after crushing the waste paint canisters, and prevent the environmental pollution.

Another object of the present invention is to provide a recycling system of the waste paint canisters, which can increase efficiency of removing the paint, reduce the use of the organic solvent, and prevent the environmental pollution by separately removing the fragments of the paint after and before washing the fragments of the waste paint canisters with the organic solvent.

Technical Solution

To achieve the above objects, the present invention provides a recycling system of waste paint canisters comprising a crushing section 10 for crushing waste paint canisters into fragments having a predetermined size; a magnetic force selecting section 20 for transporting the fragments of the waste paint canisters crushed at the crushing section 10 and for selectively removing only paint powder partially separated from the fragments of the paint canisters by means of a magnet; a washing section 30 including a washing tank 32 for washing the fragments of the paint canisters partially removed of the paint powder at the magnetic force selecting section 20 with organic solvent, and a transporting device

33 disposed at a lower end of the washing tank for transporting the washed fragments of the paint canisters and for preventing the organic solvent from being collected therein; and a vibration magnetic force selecting section 40 for selectively separating the organic solvent and the paint from the fragments of the paint canisters washed and transported from the washing section 30 by means of the vibration of a vibration plate 42 and a magnet.

Also, the washing section 30 is constructed of a first washing section 31 and a second washing section 34, which are disposed continuously.

Advantageous Effects

Therefore, according to the construction and action of present invention, following advantages can be accomplished.

First, it is possible to reduce the time and the expense required for the removal of the paint by using a method of washing fragments of the paint canisters with organic solvent after crushing the waste paint canisters, and prevent the environmental pollution.

Second, it is possible to efficiently remove the paint, reduce the use of the organic solvent to thereby prevent the environmental pollution by separately removing the powders of the paint after and before the washing of the fragments of the waste paint canisters with the organic solvent .

Third, since it is possible to separately remove the paint only from the waste paint canisters, so that the metal can be recycled from the paint canisters to thereby reduce resources.

Best Mode for Carrying Out the Invention

Hereinafter, the preferred embodiment of the present invention will be described in detail with reference to the appended drawings .

In FIG. 1, the crushing section 10 functions to crush metals into small fragments by using the crushing device for waste paint canisters, and a well-known crusher is generally employed for it in the present invention.

The crusher is generally provided with a hopper 11 at the upper portion, and a rotation type cutter 12 at the lower portion. When the paint canisters are transported by means of a conveyor, and the like, and charged into the hopper 11, the paint canisters are held at the hopper 11 and crushed during the passage through the cutter 12 disposed at the lower portion thereof.

In the present invention, the waste paint canisters are crushed finely into fragments having a size of about 5 mm by passing through the upper hopper 11 and the cutter by means of two-stage crushing or multi-stage crushing, and then passing through the hopper and the cutter 14. Thus, the contacting area of the fragments of the waste paint canisters with organic solvent becomes wide at the time of the washing so that it makes efficient to remove the paint stuck to the paint canisters.

Also, this is because, when the paint canisters are crushed finely, the paint stuck to the paint canisters is separated from the metal in addition to the crushing of the paint canisters. Thus, the paint separated from the metal is about 70% of the paint remained at the inside of the paint canisters. Accordingly, it becomes possible to remove the paint more efficiently if the paint is thus removed previously, so that it is possible to reduce the amount of the organic solvent used to thereby prevent the environmental pollution and reduce the expense. In FIG. 3, the magnetic force selecting section 20 functions to selectively remove the paint powder only from the fine metal fragments produced at the crushing section 10 by using a magnet. As described above, paint powders arriving about 70% of the whole remaining paint is separated during the passage through the crushing section 10. Thus produced paint powders can be removed without separate treatment by the organic solvent as they are previously separated.

The magnetic force selecting section 20 is constructed of a belt conveyor 21 and a magnetic conveyor 22. In this instance, the magnetic conveyor 22 is disposed at the upper portion of one end of the belt conveyor 21, and a magnet is mounted only to a roller at an ascending portion of the belt. Also, the lower portion of the magnetic conveyor 22 is separated from the upper portion of the belt conveyor 21 with a space small enough for them to be contacted with each other, and the transporting direction of the belt conveyor and that of the magnetic conveyor are opposite to each other at the connection portion.

Accordingly, the fragments of the paint canisters and the paint powder produced from the crushing section 10 are transported by means of the belt conveyor 21, and when they reach one end of the belt, metal fragments are only attached to the upper magnetic conveyor by means of the magnet of the upper magnetic conveyor 22 and transported with it, and the separated paint powder is dropped to the below by the belt conveyor and separated to thereby be removed.

The separated paint powder is stored at separate waste deposition place and burned out at high temperature. Also, the separated metal fragments are transported to a washing section by the magnetic conveyor 22, at which a magnet is not disposed, so that the metal fragments arriving at the end of the magnetic conveyor are made to drop from the conveyor.

The dropped metal fragments are supplied to the washing section 30 by means of a hopper 23 for receiving the dropped metal fragment and a chip conveyor 24 for transporting them.

In FIGs. 1 and 4, the washing section 30 comprises washing tanks 32, 35 for washing the fragments of the paint canisters with the organic solvent, from which a portion of the paint is removed, and transporting devices 33, 36 disposed at the lower end of the washing tanks for transporting the washed fragments of the paint canisters and preventing the organic solvent from being collected therein.

The washing tanks 32, 35 are opened at the upper and lower surfaces such that each of which becomes narrower from an upper opening portion to a lower opening portion, the lower opening portion is opened to the side direction, and the transporting devices 33, 36 are disposed at the lower of the washing tanks to penetrate the lower opening portion. The washing tanks accommodate organic solvent at the inside for dissolving the paint, so that the fragments of the paint canisters are dissolved by the organic solvent to be transported through the lower opening portion by the transporting devices 33, 36, when the fragments of the paint canister are supplied through the upper opening portion.

The transporting devices 33, 36 are constructed of screw conveyors for transporting the metal fragments together with the organic solvent. The screw conveyor is rotated to push the organic solvent and the metal fragments in the forward direction to thereby accomplish the transportation.

In addition, since the screws are rotated at the lower portion of the washing tanks to cause swirling current of the organic solvent in the washing tanks, the organic solvent in the washing tanks is performed of the convection by the swirling current to thereby be mixed and prevented from being collected. Furthermore, the organic solvent is in contact with the metal fragments well by the convection of the organic solvent so that the paint can be more efficiently separated from the metal fragments.

The screws of the screw conveyors 33, 36 and the passages for accommodating the screws are disposed to define gaps there-between, so that organic solvent can be flowed back to the washing tanks through the gap defined between the screw and the passage.

The organic solvent functions as a detaching agent for removing the paint from the metal fragments. Furthermore, since it is sustained or evaporated by the metal fragment at the time of the washing, it should be complemented every day for the deficient volume. Also, since the organic solvent is required for separate collection and treating, the organic solvent used for the washing is stored separately and treated by a specialized treating company.

According to a preferred embodiment of the present invention, the washing section 30 is divided into a first washing section 31 and a second washing section 34. Each of the first washing section 31 and the second washing section 34 has washing tanks 32, 35 and transporting devices 33, 36 as described above, and structure thereof is identical.

In the present embodiment, one end of the transporting device 33 of the first washing section 31 is connected to upper opening portion of the washing tank 35 in the second washing section. Accordingly, fragments of the paint canisters, which have been washed in the first washing section 31, are supplied to the washing tank 35 of the second washing section so that they are once more washed.

The reason of performing the washing twice is that, it is difficult to substitute the organic solvent in the washing tank every time, and the organic solvent received in the first washing tank contains a large quantity of paint so that it cannot remove the paint stuck to the metal fragments clean.

Accordingly, it is necessary to remove the paint stuck to the metal fragments completely by washing them with clean organic solvent at the second washing section, to thereby remove it clearly.

In FIGs. 1 and 5, the vibration magnetic force selecting section 40 is characterized by comprising a vibration plate 42 for separating the organic solvent and the paint by means of vibration, a vibration generation device 44 disposed at the lower of the vibration plate for generating the vibration, and a magnetic conveyor 43 disposed at the upper one side of the vibration plate for selectively transporting the metal fragments from the fragments of the paint canisters, which are transported and separated by the vibration plate, by mounting a magnet only at a roller disposed at the side of the vibration plate.

Also, it is preferable that a flexible cylindrical induction pipe 41 is disposed at one side of the vibration plate 42 adjacent to the washing section so that it can be easily connected to the transporting device of the washing section. In addition, it is preferable that a storage tank is mounted at the other end of the vibration plate for storing the paint and the organic solvent separated and removed during the washing process.

The vibration plate 42 is constructed of a long and flat plate, and is made slant so that a portion contacting with the washing section is positioned high, and is connected to the vibration generation device 44 at the lower portion thereof. The vibration plate vibrates in the upward and downward directions by means of the vibration generation device, and the metal fragments transported by the transporting device of the washing section are ascended on the vibrating vibration plate 42 through the induction pipe 41.

The metal fragments are vibrated on the vibration plate by the vibration of the vibration plate to thereby separate the paint fragments from the organic solvent sustained at the metal fragments, and they are moved in one direction by the inclination of the vibration plate.

Furthermore, the magnetic conveyor 43 is disposed at one upper side of the vibration plate almost adjacent to it, and a magnet is mounted only at a roller disposed at an ascending portion of the belt in the magnetic conveyor 43, and the moving direction of the belt conveyor at the lower portion of the conveyor is opposite to the moving direction of the fragments of the paint canisters due to the inclination of the vibration plate. Therefore, the metal fragments transported by the inclination of the vibration plate are attached and separated by the magnet, and the separated organic solvent and the paint are accommodated in a storage tank mounted at the lower portion of the other end of a drum plate. The accommodated organic solvent and the paint are separately treated together with the paint and the like separated at the magnetic force selecting section 20.

The magnetic conveyor is disposed to remove the paint once more finally, which was removed by means of the previous washing, to thereby completely separate the metal fragments and the paint.

With regard to the vibration generation device 43, a motor and a cam can be generally used, although means capable of generating the vibration can be used in general.

Hereinafter, the action of the present invention will be described in connection with the arrows shown in FIG. 2.

When the paint canisters sustained with the paint at the inside are charged into the hopper 11 of the crushing section 10, the paint canisters are moved in the lower direction from the hopper and primarily crushed by the rotating cutter 12. Since the crushing section of the present invention is constructed in two-stages or multi- stages, the paint canisters are once more crushed finely by the lower hopper 13 and the cutter 14 into a size of 5 mm.

The crushed fragments of the paint canisters are disposed on the belt conveyor 21 of the magnetic force selecting section 20, and transported to one end of the belt conveyor. In this instance, since the magnetic conveyor 22 is disposed to face with the belt conveyor, metal fragments are only become to attach to the magnetic conveyor 22 and the paint powders are remained on the belt conveyor 21. The remained paint powders are dropped from the end of the belt conveyor 21 to be stored in a separate storage tank, and the metal fragments are transported by the magnetic conveyor 22. Since the roller disposed at a descending portion of the belt in the magnetic conveyor, is not provided with a magnet, the metal fragments are dropped at the end of the conveyor.

The metal fragments transported by the magnetic conveyor 22 are charged into a washing tank 32 of the first washing section, and they are washed by the organic solvent at the inside of the washing tank 32 for removing the paint.

The metal fragments washed in the washing tank 32 of the first washing section are transported by the screw conveyor 33 to a washing tank 35 of the second washing section. The transported metal fragments are once more washed in the washing tank 35 of the second washing section.

The washed metal fragments are transported to the vibration magnetic force selecting section 40 by the screw conveyor 36. The metal fragments are dropped into the induction pipe 41 of the vibration magnetic force selection portion, and ascended on the vibration plate 42 via the induction pipe 41.

As the vibrating vibration plate 42 is disposed to be inclined, the metal fragments are vibrated and moving down along the inclination. In this instance, the organic solvent and the paint fragments are separated from the metal fragments by the vibration of the vibration plate and accommodated in the storage tank disposed at the lower portion of the end of the vibration plate. The metal fragments flowed down from the vibration plate are separated from the paint by the magnet disposed at the magnetic conveyor 43, which is disposed to face one end of the vibration plate 42, and the paint fragments are dropped from the vibration plate and collected separately. The metal fragments separated as such are transported to a compressor (not shown) , which was not described in the above description, and compressed into a size proper to be treated again and made into metal agglomerates to thereby be transported to a metal working factory.

As shown in FIG. 6, according to another aspect of the present invention, to solve the technical task of the present invention as described above, there is provided a process comprising the steps to be described below, using the device as described above: a crushing step SlOO of crushing waste paint canisters at a crushing section 10; a magnetic force selecting step S200 of selectively removing only paint fragments separated from the crushed fragments of the paint canisters produced at the crushing step SlOO using a magnet; a washing step S300 of washing the fragments of the paint canisters selected at the magnetic force selecting step S200; and a vibration magnetic force selecting step S400 of selectively removing only organic solvent and the paint from the fragments of the paint canisters washed at the washing step S300 by means of the vibration plate and a magnet . The crush step SlOO is to crush the waste paint canisters into fragments having a size of about 5 mm after charging the waste paint canisters into the crushing section 10 provided with a crusher. At this step, since the waste paint canisters are finely crushed, the crushed fragments of the paint canisters can be made to contact with the organic solvent more efficiently. Also, since 70% of the paint sustained at the inside of the paint canisters is separated during the crush process of the paint canisters, the crush step makes it easy to separate the paint from the paint canisters.

The magnetic force selecting step S200 is to select the paint fragments crushed and separated at the crush step before washing them with the organic solvent. Since the present step uses the magnetic conveyor 22, the metal fragments are only transported to the washing section 30 by the conveyor, and the paint fragments are separately removed and treated because the paint fragments are not stuck to the magnet.

The washing step S300 is to cleanse the fragments of the paint canisters selected at the magnetic force selecting section S200 in the washing tank with the organic solvent. The organic solvent acts to separate the paint by the reaction with the paint. Accordingly, the paint is separated from the metal fragments when the fragments of the paint canisters are washed by the organic solvent.

The vibration magnetic force selecting step S400 is to remove the organic solvent and the paint from the metal fragments washed at the washing step S300. In the present step, the flat and inclining vibration plate 42 are vibrated to thereby separate the organic solvent and the paint from the metal fragments, and they are discharged from the vibration plate along the inclination to thereby be stored separately, and the metal fragments are only selected by the magnetic conveyor 43.

While the paint is removed from almost all of the metal fragments by the selection of the vibration plate 42 during the washing step S300 and the vibration magnetic force selecting step S400, sustained paint can be existed at the metal fragments. Accordingly, the metal fragments are only selectively separated by the magnetic conveyor 44 as was in the magnetic force selection step S200. Moreover, as shown in FIG. 8, according to another preferred embodiment of the present invention, the washing step S300 may be divided into a first washing step S300-1 and a second washing step S300-2, so that the fragments of the paint canister can be washed twice in sequence.

Since the organic solvent reacts with the paint chemically, there are a great quantity of the paint dissolved into the organic solvent at the first washing step S300-1 to thereby reduce the reaction degree between the organic solvent and the paint. Accordingly, the continuous washing process of the fragments of the paint canisters is reduced in efficiency due to the accumulated paint.

Therefore, it becomes possible to remove the paint more efficiently and cleanly from the metal fragments through the second washing step S300-2 by means of clean organic solvent.

Claims

What Is Claimed Is:

1. A recycling system of waste paint canisters comprising: a crushing section 10 for crushing waste paint canisters into fragments having a predetermined size; a magnetic force selecting section 20 for transporting the fragments of the waste paint canisters crushed at the crushing section 10 and for selectively removing only paint powder partially separated from the fragments of the paint canister by means of a magnet; a washing section 30 including a washing tank 32 for washing the fragments of the paint canisters partially removed of the paint powder at the magnetic force selecting section 20 with organic solvent, and a transporting device 33 disposed at a lower end of the washing tank for transporting the washed fragments of the paint canisters and for preventing the organic solvent from being collected therein; and a vibration magnetic force selecting section 40 for selectively separating the organic solvent and the paint from the fragments of the paint canisters washed and transported from the washing section 30 by means of the vibration of a vibration plate 42 and a magnet.

2. The recycling system according to claim 1, wherein the washing section 30 is constructed of a first washing section 31 and a second washing section 34, which are disposed continuously.

3. The recycling system according to claim 1 or 2, wherein the magnetic force selecting section 20 is constructed of a belt conveyor 21 and a magnetic conveyor 22 disposed at the upper one side of the belt conveyor 21, and a magnet is mounted only at a roller disposed at an ascending portion of a belt of the magnetic conveyor, so that only metal fragments among the fragments of the paint canisters transported by the belt conveyor are transported on the magnetic conveyor.

4. The recycling system according to claim 1 or 2, wherein the vibration magnetic force selecting section 40 includes a vibration plate 42 for separating the organic solvent and the paint by means of vibration, a vibration generation device 44 disposed at the lower portion of the vibration plate for generating the vibration, and a magnetic conveyor 43 disposed at the upper one side of the vibration plate for selectively transporting only the metal fragments from the fragments of the paint canisters transported and separated by the vibration plate, by means of a magnet mounted only at a roller disposed at an ascending portion of a belt.

5. A method of recycling waste paint canisters comprising: a crushing step SlOO of crushing waste paint canisters at a crushing section 10; a magnetic force selecting step S200 of selectively removing only paint fragments separated from the crushed fragments of the paint canisters produced at the crushing step SlOO using a magnet; a washing step S300 of washing the fragments of the paint canisters selected at the magnetic force selecting step S200; and a vibration magnetic force selecting step S400 of selectively removing only organic solvent and the paint from the fragments of the paint canisters washed at the washing step S300 by means of the vibration plate and a magnet .

6. The recycling method according to claim 5, wherein the washing step S300 comprises a first washing step S300-1 and a second washing step S300-2 which are performed to wash the fragments of the paint canisters twice in sequence.