KR101569909B1 - Recycling Method of Metal Coated Resin Waste - Google Patents

Abstract

The present invention relates to a method of recycling resin wastes formed with a metal coating layer, and more particularly, to a method of recycling resin wastes, comprising the steps of: a) cutting the resin waste; And b) separating and recovering the metal coating layer and the resin by magnetic force sorting the cut resin waste.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method of recycling a resin waste having a metal coating layer formed thereon,

The present invention relates to a method of recycling a resin waste having a metal coating layer formed thereon. More particularly, the present invention relates to a method for recycling a large amount of metal resources and resin resources in a short period of time in an environmentally friendly and inexpensive process.

ABS-based resin has excellent moldability, secondary processability, high impact resistance, good heat resistance, and can be plated, so it is used as a part of various applications such as automobile, home appliance and electronic products.

As the use of the metalized plastics has greatly increased, the waste thereof has also increased remarkably. However, as disclosed in Korean Patent Laid-Open Publication No. 1998-083480, the plated layer is chemically dissolved by using a reaction solution, Method is being used. However, the method of chemically dissolving the plated layer and separating it from the resin material, drying the ABS resin by hot air and neutralizing the resin material is a very harmful and complicated process itself, takes a long time, It is an environmental method. Further, as the plating layer is dissolved and removed, the plating layer metal, which is a valuable oil resource, is not recycled and discarded.

Korean Patent Publication No. 1998-083480

The present invention is an environmentally friendly physical method to provide a method for recycling a resin waste formed with a metal coating layer. In detail, it is possible to construct a low-cost process suitable for commercialization, and it is possible to construct a safe process without generating a toxic waste liquid, can be mass-processed in a short time, can separate and recover metal and resin, To provide a method of recycling a resin waste in which a metal coating layer capable of separating and recovering resin is formed.

The present invention provides a method for recycling a resin waste in which a metal coating layer is formed.

A method according to an embodiment of the present invention is a method for recycling a resin waste in which a metal coating layer is formed, comprising the steps of: a) cutting a resin waste; And b) separating and recovering the metal coating layer and the resin by magnetic force sorting the cut resin waste.

In the method according to an embodiment of the present invention, the metal coating layer may be a laminated layer in which two or more different metal layers are laminated, and after the step b), c) And thermally oxidizing a metal layer in the layer.

The method according to an embodiment of the present invention may further comprise: after step c): d) peeling the metal remaining as a metal layer oxidized in step c) and the metal remaining in the laminate layer by applying physical force to the laminate layer .

The method according to an embodiment of the present invention may further include separating and recovering the metal and the metal oxide using e) magnetic force selection after the step d).

The method according to an embodiment of the present invention may further comprise: after d), sieving a mixture of the metal and the metal oxide obtained in step d).

The method according to an embodiment of the present invention may further perform magnetic force sorting on a product passing through the sieve body when the sieve is sieved.

In the method according to an embodiment of the present invention, the resin may be a laminate in which two or more different resins are laminated, and the resin separated and recovered in the step b) may be subjected to electrostatic separation to separate the resin The method further comprising the steps of:

In the method according to an embodiment of the present invention, the cutting of the step a) may be performed with a size of 1 to 10 mm.

In the method according to an embodiment of the present invention, the magnetic force selection in step b) is dry magnetic force selection, and may be performed at 1000G to 6000G.

In the method according to an embodiment of the present invention, the thermal oxidation can be carried out at 800 to 1000 ° C in the presence of oxygen.

In the method according to an embodiment of the present invention, the application of the physical force can be performed by a rod mill or a ball mill.

In a method according to an embodiment of the present invention, sieving may be performed using sieves of 300 to 500 mesh.

In the method according to an embodiment of the present invention, magnetic force selection for the product passing through the sieve may be performed at 1000G to 4000G.

In the method according to an embodiment of the present invention, the resin includes an acrylonitrile-butadiene-styrene (ABS) resin, a polypropylene (PP) resin, a polyethylene (PE) resin, a polyvinyl chloride can do.

In the method according to an embodiment of the present invention, the metal coating layer may comprise at least a copper layer and a nickel layer.

Since the metal coating layer and the resin can be separated and recovered by an extremely simple and physical method of cutting and magnetic force sorting, the method of recycling resin wastes formed with a metal coating layer according to an embodiment of the present invention, The process is environmentally friendly and safe, the process can be constructed at low cost, and the process can be mass-processed in a short time.

Furthermore, when performing the thermal oxidation step according to an embodiment of the present invention, metals of the metal coating layer can be separated and recovered by a physical method even if the metal coating layers are different from each other.

Further, when performing the thermal oxidation step and the physical force application step according to the embodiment of the present invention, it is advantageous that metals of the metal coating layer can be separated and recovered by a simple body wave which is extremely suitable for commercialization.

Furthermore, through the electrostatic separation step according to an embodiment of the present invention, not only the metals forming the metal coating layer but also the dissimilar resins forming the resin can be separated and recovered.

In the case of performing the thermal oxidation step, the physical force applying step and the magnetic force selecting step according to an embodiment of the present invention, cutting-magnetic force sorting-heat treatment-milling-magnetic force sorting or cutting-magnetic force sorting-heat treatment- milling- cost of a simple magnetic separation and there is an advantage that can be recovered by separating the metal forming the environmentally friendly process, in the coating layer with high quality.

FIG. 1 is a process diagram showing a method of recycling a resin waste in which a metal coating layer is formed according to an embodiment of the present invention,
FIG. 2 is another process drawing showing a method of recycling a resin waste formed with a metal coating layer according to an embodiment of the present invention,
FIG. 3 is another process diagram showing a method of recycling a resin waste formed with a metal coating layer according to an embodiment of the present invention,
FIG. 4 is another process diagram showing a method of recycling a resin waste formed with a metal coating layer according to an embodiment of the present invention,
FIG. 5 is another process diagram showing a method of recycling a resin waste formed with a metal coating layer according to an embodiment of the present invention,
FIG. 6 is another process diagram showing a method of recycling a resin waste formed with a metal coating layer according to an embodiment of the present invention,
7 is another process diagram showing a method of recycling a resin waste formed with a metal coating layer according to an embodiment of the present invention.

Hereinafter, a method of recycling waste according to the present invention will be described in detail with reference to the accompanying drawings. The following drawings are provided by way of example so that those skilled in the art can fully understand the spirit of the present invention. Therefore, the present invention is not limited to the following drawings, but may be embodied in other forms, and the following drawings may be exaggerated in order to clarify the spirit of the present invention. Hereinafter, the technical and scientific terms used herein will be understood by those skilled in the art without departing from the scope of the present invention. Descriptions of known functions and configurations that may be unnecessarily blurred are omitted.

The present invention provides a method of recycling waste, and provides a method of recycling resin waste formed with a metal coating layer.

In one embodiment of the present invention, the waste to be recycled may be a resin material having a metal coating layer on at least a part of the surface of the resin molded body, and the shape of the resin molded body may have an appropriate shape depending on the use. In detail, the waste to be recycled may be a resin material in which a metal coating layer is formed by plating (including electroless plating).

The use of the resin material on which the metal coating layer to be recycled is formed is not particularly limited, but it may be a decorative outer material or a structural material whose outer appearance can have a metallic luster and an internal effect by the metal coating layer. Examples of decorative exterior materials include automotive bumpers, spectacle frames, radiator grilles for vehicles, vehicle indicator covers, automotive molding materials, exterior materials for appliances, exterior materials including keypads for portable electronic products, decorative articles such as necklaces and bracelets However, it goes without saying that the present invention can not be limited by the use of the resin material to be recycled.

The resin and / or the metal coating layer of the resin material on which the metal coating layer is formed may vary depending on the application, but the resin may be an acrylonitrile-butadiene-styrene (ABS) resin, a polypropylene (PP) resin, a polyethylene (PE) resin, a polyvinyl chloride Resin, or a laminated resin thereof. Specifically, since the metal coating layer can impart a beautiful appearance and corrosion resistance, the above-mentioned resin can be used as an ABS (acrylonitrile-butadiene-styrene) resin , A laminated or mixed resin of ABS resin and PP resin, a laminated or mixed resin of ABS resin and PE resin, or an ABS resin such as a laminated or mixed resin of ABS resin and PVC resin.

The metal coating layer may be any kind of metal as long as it can impart the required gloss and required physico-chemical properties to the resin. However, when considering the use of conventional ABS-based resin, the metal coating layer may be copper, nickel, And they may include a laminated layer.

A method of recycling waste according to an embodiment of the present invention comprises the steps of: a) cutting a resin waste; And b) separating and recovering the metal coating layer and the resin by magnetic force sorting the cut resin waste.

As shown in Fig. 1, the cutting step s100 is a step of cutting a resin material having the metal coating layer formed thereon, and the separation between the resin and the metal coating layer is simultaneously performed by the physical force applied when the resin waste is cut .

In detail, when the resin and the metal coating layer are cut together at the same time as the physical softness and strength of the resin and the metal coating layer are different from each other, the interface detachment between the resin and the metal coating layer can be achieved by the impact applied for cutting itself.

In order to effectively achieve interfacial separation due to the impact applied at the time of cutting, it is preferable that the size of the cut is in the range of 1 mm to 10 mm. When the cut size is less than 1 mm, the improvement in the interface delamination effect is insignificant, There is a risk that the cost of constructing the process for microcutting increases. If the cutting is performed in a size exceeding 10 mm, there is a risk that an area not separated from the interface between the resin and the metal coating layer remains. Furthermore, when cutting is performed to a size of 1 mm to 10 mm, the resin material may have excellent charge characteristics in the electrostatic separation step to be described later.

The cutting can be performed by using a conventional polymer cutter equipped with one or more blades. As a specific and non-limiting example, a plurality of cutting blades may be mounted on the inner circumferential surface of the cylindrical drum, And cutting the cut pieces to a predetermined size or a predetermined size or smaller.

After the cutting step (s100) is performed, a magnetic force selecting step (s200) for separating and recovering the metal coating layer and the resin by magnetic force selection may be performed.

At the cutting step, the metal coating layer and the resin can be separated at the same time as the resin waste is cut off. The magnetic force sorting step (s200) is performed by applying magnetic force to the product of the cutting step (s100) Whereby the metal coating layer and the resin can be separated and recovered. The magnetic force selecting step may be performed by dry or wet magnetic force lines, and may be performed at 1000 Gauss (G) to 6000 Gauss (G) in terms of the effective separation number of the metal coating layer and the resin. The magnetic force selection can be performed by using a magnetic separator which is conventionally used for separating and recovering a mixture of a non-magnetic substance and a magnetic substance. As a non-limiting example, a drum magnetic separator, a lattice magnetic separator, (Electromagnetic Magnetic Ferro Filter, High Intensity Magnetic Separator, ERIEZ, Model Name: L-4, USA), and the like.

As described above, according to the method of the present invention, since the metal coating layer and the resin can be separated and recovered by an extremely simple and physical method of cutting and magnetic force sorting, no wastewater or toxic gas is generated The process is environmentally friendly, safe, and can be mass-processed in a short time.

As shown in FIG. 2, the method according to an embodiment of the present invention can be applied to a metal coating layer separated and recovered in the magnetic force sorting step s200, wherein one metal layer among the plurality of metal layers constituting the metal coating layer is thermally oxidized (S300). ≪ / RTI >

The resin material waste formed with the metal coating layer is usually provided with a metal coating layer in which two or more metal layers are stacked to satisfy physical properties and aesthetics required for use. As a specific example, the metal coating layer may include a laminated layer in which two or more metal layers selected from a copper layer, a nickel layer and a chromium layer are laminated.

In the resin material waste formed with the metal coating layer, the resin is also recycled as oil resources, but each metal constituting the metal coating layer is a valuable resource having a higher added value than the resin.

However, since the metal coating layer including the laminated layer is in a state where the metal layers having a small thickness are bound by plating or vapor deposition, it is practically impossible to physically separate and recover the metals constituting the metal coating layer.

The method according to an embodiment of the present invention includes a step of performing a thermal oxidation step (s300) of thermally oxidizing a metal layer among a plurality of metal layers forming a metal coating layer on a metal coating layer separated and collected in the magnetic force sorting step s200, The metals constituting the metal coating layer can be separated and recovered by a physical method.

In detail, when the metal coating layer includes a laminated layer in which a plurality of metal layers are laminated, a metal layer among the plurality of metal layers constituting the laminated layer is selectively thermally oxidized to convert one metal layer into a metal oxide layer, , The metals constituting the metal coating layer can be separated and recovered.

The thermal oxidation of the metals forming the metal coating layer depends on the inherent properties of the metal. Accordingly, the metal coating layer separated and recovered in the magnetic force selecting step s200 is subjected to heat treatment in an atmosphere in which oxygen exists, thereby thermally oxidizing a metal layer which is thermally oxidized at a relatively low temperature among a plurality of metal layers constituting the lamination layer It can be converted into a metal oxide.

That is, by thermally oxidizing one metal layer thermally oxidized at a lowest temperature among the plurality of metal layers included in the metal coating layer, the metal oxide layer having a softness, brittleness, and strength different from those of metal By producing a composite layered layer of metal layers, metals constituting the metal coating layer can be separated and recovered by physical methods.

In the thermal oxidation step (s300), the heat treatment temperature for thermal oxidation can be controlled in consideration of the metal layers included in the metal coating layer. As a specific example, when the metal coating layer includes a laminated layer in which a copper layer and a nickel layer are laminated, the heat treatment may be performed at 800 to 1000 ° C in the presence of oxygen. Specifically, the heat treatment can be performed at 800 to 1000 ° C in the air, thereby converting the copper layer into the copper oxide layer. In the heat treatment for thermal oxidation, the heat treatment time can be appropriately adjusted in consideration of the thickness of the metal layer to be converted into the oxide layer. As a non-limiting example, heat treatment can be performed for 10 minutes to 2 hours.

By the thermal oxidation step (s300), a composite layered layer in which the metal layer and the metal oxide layer are laminated can be obtained, and the physical force application step (S400) can be performed on the product obtained in this thermal oxidation step (s300) .

As described above, the metal and the metal oxide have completely different physical properties such as ductility, brittleness and strength. Further, the metal oxide is very strong in brittleness rather than being deformed by the external force applied to the metal. Step S400 of applying the physical force may be a step of separating (stripping) the metal oxide layer from the metal layer by applying a physical force to the complex layered layer in which the metal layer and the metal oxide layer are laminated by using this brittle difference between the metal and the metal oxide .

That is, it may be a step of peeling off the metal remaining in the composite layer and the metal oxide by applying a physical force to the product (composite laminated layer) obtained in the thermal oxidation step (s300) of applying the physical force (s400).

Since separation (separation) between the metal and the metal oxide is performed by breaking the metal oxide, the application of the physical force is preferably an application of an impact capable of easily breaking the metal oxide. As a specific example of the impact application, Or a ball mill. That is, the physical force application step (S400) may be performed by a rod mill or a ball mill, which is preferably an impact.

As shown in FIG. 3, the method according to an embodiment of the present invention includes a step of separating and recovering a metal and a metal oxide by performing magnetic force sorting on a product obtained in the applying physical force s400 (s500 ). As described above, as the metal oxide is broken by the physical force applying step (s400), the metal and the metal oxide are separated, and the metal and the metal oxide can be separated and recovered by the magnetic field applied at the time of sorting the magnetic force. At this time, the magnetic force selection may be a dry or wet magnetic force sorting. The magnetic field applied may be such that the metal and the metal oxide can be effectively separated. Specifically, the metal coating layer includes a laminated layer in which a copper layer and a nickel layer are laminated, and is selectively formed by a thermal oxidation step (s300) When the copper layer is oxidized to a copper oxide layer, magnetic force selection can be performed at 1000G to 6000G. The magnetic force selection can be performed by using a magnetic separator which is conventionally used for separating and recovering a mixture of a non-magnetic substance and a magnetic substance. As a non-limiting example, a drum magnetic separator, a lattice magnetic separator, (Electromagnetic Magnetic Ferro Filter, High Intensity Magnetic Separator, ERIEZ, Model Name: L-4, USA), and the like.

Although not shown in the drawings, the thermal oxidation step (s300), the physical force application step (s400), and the magnetic force selection step (s500) may be performed on the magnetic material (metal) obtained by the magnetic force selection step (s500) Can be repeatedly performed again.

That is, when two or more metal layers different in metal from each other obtained in the magnetic force selection step s500 are laminated, the heat treatment temperature in the thermal oxidation step (s300) is controlled so that one of the two or more metal layers is converted into a metal oxide layer The metal layer and the metal oxide layer are physically separated (stripped) in the physical force application step (S400), and then the metal of the metal layer and the metal oxide of the metal oxide layer are separated and recovered by magnetic field application in the magnetic force selection step (s500) Step can be repeatedly performed. If necessary, it is needless to say that the repetition of steps (s300) to (s500) can be repeatedly performed until a single metal layer is separated and recovered in the magnetic force selecting step.

FIG. 4 is another process diagram of a recycling method according to an embodiment of the present invention. As shown in FIG. 4, after a physical force application step (s400) is performed, a product obtained by applying physical force (s400) A sieving step (s600) may be further performed.

As described above, the metal oxide can be relatively easily broken by physical impact relative to the metal. Accordingly, by the physical force applying step (S400), the metal oxide is broken and separated from the metal, and can be continuously broken even after being separated. In detail, the metal may have a size similar to the size cut in the cutting step (s100) because the size thereof does not greatly change by the physical force applying step (S400), but the metal oxide may be pulverized into fine particles relative to the metal.

More specifically, the product obtained in the step of applying physical force (s400) may have a bimodal distribution with a relatively large first peak and a relatively small second peak. The relatively large first peak may account for most of the ductile metal than the brittle, and the relatively small second peak may account for most of the brittle metal oxide.

Accordingly, after applying the physical force (s400), the assembly product (the product that has not passed through the sieve) and the relatively granular microparticle (the product passing through the sieve) and the relatively granulated product , The metal oxide and the metal can be separated and recovered from the product obtained in the physical force application step (S400).

In order to separate the metal from the metal oxide by the sintering step (s600), as described above, the metal oxide and the metal are separated from each other in the physical force application step (S400), and the physical force It is good to be authorized. As a specific example, when a physical force mainly for an impact is applied, a physical force can be applied so that a product having the bimodal distribution as described above can be obtained. In a specific, non-limiting example, when the physical force application is via a rod mill or a ball mill, the amount of rod in the case of a rod mill may be from 20 to 60% by volume of the mill volume, May be 1: 0.5 to 3, the number of revolutions may be 30 to 90 rpm, and the milling may be performed for 10 to 100 minutes. In the case of a ball mill, the size of the stainless steel (or steel ball) may be 10 to 100 mm, the amount of balls may be 30 to 70% by volume of the vessel volume, and the mass ratio of water to milled material (composite layer) To 3, the number of revolutions may be 30 to 90 rpm, and the milling may be performed for 10 to 100 minutes.

In the sieving step (s600), the size of the sieve is sufficient so long as the metal oxide can not be mixed into the assembled product. In a specific, non-limiting example, when the applying physical force s400 is performed by a rod mill or a ball mill, the size of the sieve may be between 300 and 500 mesh.

In this sieving step (s600), although the purity of the product to be separated and recovered from magnetic force separation may be slightly lowered, the metal oxide and the metal can be separated and recovered by a simple, economical and rapid process of sieving.

FIG. 5 is another process diagram of a recycling method according to an embodiment of the present invention. As shown in FIG. 5, after the sill blending step (s600) described above is performed, similar to the above-described magnetic force sorting step s500 (S510, s520) may be performed for each of the assembled product and the microparticle by sieving.

The magnetic force for each of the assembled product and the microparticles can be selected by applying a magnetic field relatively low compared to the process shown in FIG. 3, that is, the process of performing magnetic force sorting on the product obtained in the physical force applying step (S400) The metal and metal oxide are separated from each other primarily by the sieving, so that a large amount of product can be processed and the magnetic force can be selected more quickly in a short period of time. As a result, productivity can be improved. Can be improved.

Furthermore, as shown in Fig. 6, metal oxides are very brittle and extremely easily destroyed by physical force, so that almost no metal oxide may exist in the assembled product. Accordingly, the magnetic force selection (s520) can be performed only for the microparticles so as to remove a trace amount of metal that is not atomized in the course of atomization of the metal oxide, and to enhance the quality of the recovered material.

That is, a method of changing a metal layer in a metal coating layer into a metal oxide layer by thermal oxidation and separating the metal oxide from the metal by application of physical force using the difference in physical properties between the metal and the metal oxide, (Metal and / or metal oxide) that can be separated and recovered from the metal and metal oxide by simple sieving, and further, to improve the quality of the product (metal and / or metal oxide) (s510 and / or s520) may be performed. At this time, as described above, since most of the assembled product is metal, magnetic force selection (s520) can be performed only for the microparticles.

The magnetic force selection (s510 and s520) for the assembled product and the microparticles can be performed independently of each other at 1000 to 4000 Gauss (G), and a magnetic separator, which is commonly used for separating and recovering a mixture of a non- . ≪ / RTI > Examples include, but are not limited to, Drum Magnetic Separator, Grid Magnetic Separator, Permanent Magnetic Ferrous Trap, Electro Magnetic Ferro Filter, High Intensity Magnetic Separator separator, ERIEZ, Model: L-4, USA).

3, two or more metal layers, which are different from each other, are stacked in a stacked state through an assembled product obtained by sieving or sieving (s600) and a metal separating and recovering step (s510 or 520) , The heat treatment temperature in the thermal oxidation step (s300) is controlled to convert one of the two or more metal layers into a metal oxide layer, and the metal layer and the metal oxide layer are physically separated (stripped) in the physical force application step (S400) The sieving step (s600) or the sieving step (s600) and the magnetic force selecting step (s510 or s520) may be repeatedly performed. Needless to say, such repetitive operations can be repeatedly performed until a single metal layer is separated and recovered in the magnetic force selection step performed after assembly or sieving by sieving.

7 is a flowchart illustrating another method of the recycling method according to an embodiment of the present invention. As shown in FIG. 7, a non-magnetic material, which is separated and collected by a cutting step (s100) and a magnetic force selecting step (s200) The electrostatic separation step s700 for electrostatic separation can be further performed.

As described above, in the case where two or more resins different from each other as the object to be recycled are laminated or mixed, a specific example is a laminated or mixed resin of an ABS resin and a PP resin, a laminated or mixed resin of an ABS resin and a PE resin, In the case of a laminated or mixed resin of ABS resin and PVC resin, the resins different from each other contained in the product recovered and collected as a non-magnetic material can be separated and recovered by electrostatic force. In detail, the electrostatic separation can be used as long as it is a conventional electrostatic separation method used for separating and recovering waste plastics, and the electrostatic separation can be a frictional electrostatic separation.

As described above, the electrostatic separation may include a frictional charge type electrification separation in which the charged resin material is separated from the positive electrode plate and the negative electrode plate through the charged resin material, in accordance with the frictional charging characteristics of the resin material. Typical electrostatic screening is commercially advantageous in terms of cost and process time since it utilizes the physical property of the resin materials itself and charges by physical friction.

The resin material (the resin material from which the metal coating layer is peeled off) cut to a size of 1 mm to 10 mm preferably in the cutting step (s100) can be separated and recovered as a non-magnetic material in the magnetic force sorting step (s200) The resin material is particularly preferable in terms of the effective charging aspect of the friction-type electrification separation. That is, when cut to a size of less than 1 mm, the weight is light due to the characteristics of the resin material, so that it is liable to be twisted and adsorbed to the charge container for friction charging, thereby reducing the recovery rate. Due to its large size and weight, the charging itself may not be easy and there is a risk that the separation may not be done well.

The size of the charged container, the rotational speed of the charge container for friction, and the voltage applied for separation and sorting can be appropriately controlled in consideration of the resin to be separated. For example, by the electrostatic separation step (s700), the ABS resin and the PP resin; ABS resin and PE resin; Or the ABS resin and the PVC resin are separated and collected by the resin material, the charge container may be a PP resin cyclone or a PP resin zigzag tube, and the voltage applied to the positive electrode plate and the negative electrode plate is 30 To 400 kV.

Hereinafter, a practical example in which a waste radiator grill for a vehicle (a metal coating layer of ABS resin and Cu-Ni-Cr) is to be recycled is shown, which proves experimentally that the recycling method according to the present invention is excellent, It is to be understood that the present invention is not limited to the following embodiments.

(Example 1)

Cutting and magnetic force selection

The pulverized radiator grill was cut to an average of 5 mm using a polymer crusher (Daeheung Newtech, DHS-54), and the magnetic and non-magnetic materials were separated at 2,000 G using a magnetic separator (Dabo Magnetics, SSEM-600) The results are summarized in Table 1.

In Table 1, the recovery rates are expressed as weight percentages of the products recovered as magnetic and non-magnetic products, respectively, relative to the total amount of wastes input to the polymer mill, and the grade is based on the total weight of the product Expressed as% by weight of the actual resin, based on the weight percent of the metal or the total weight of the product recovered in the non-magnetic body.

(Table 1)

As can be seen in Table 1, it was found that only metals having a grade of 97.75% and a resin having a grade of 97.75% can be separated and recovered merely by performing magnetic force sorting after physically cutting the resin material waste. .

  (Example 2)

Thermal oxidation and physical strength

The metal coating layer (100 g) separated and recovered in the same manner as in Example 1 was subjected to selective thermal oxidation of copper among the copper-nickel-chromium metal coating layer under the conditions shown in Table 2 below. When the physical force application was ball milling, the size of the stainless steel ball was 1: 1 mixed with 20 mm and 30 mm, the volume of the balls was 50 volume% of the volume of the container, the mass ratio of water to the metal coating layer was 1: rpm for 70 minutes. When the physical force application was rod milling, the amount of rod was 40 volume% of the mill volume, and the mass ratio of water: metal coating layer was 1: 1 and was carried out at 70 rpm for 30 minutes.

(Table 2)

Magnetic force selection

After the thermal oxidation and physical force were applied under the conditions shown in Table 2, the magnetic and non-magnetic bodies were separated and recovered at 2,000 G using a wet magnetic separator (PWSD-457300-00A, Wet Double Drum Magnetic Separator) (Recovery rate and quality) are shown in Table 3. In this case, the quality of the metal recovered as the magnetic material and the nonmagnetic material is measured by ICP (weight%). In the case of metal oxide, the quality is indicated by the weight percentage of the metal (metal oxide), not the metal oxide.

(Table 3)

Sash

Table 4 summarizes the recovery rate and the quality of each of the separated and recovered products by sieving. The results are shown in Table 4 below. In Table 4, the product passed through the sieve was '-400' and the product not passing through the sieve was labeled '+400'

(Table 4)

Screening and magnetic separation

After the thermal oxidation and the physical force were applied under the conditions shown in Table 2, wet sieving was performed using a sieve of 400 mesh. Each of the separated and recovered products was sieved by a wet magnetic separator (Dabo Magnetic, Wet Double Drum Magnetic Separator PWDSD-457300-00A) was used to separate and collect the magnetic and non-magnetic bodies at 2,000 G, and the recovery and the quality were shown in Table 5. [ In Table 5, the product passed through the sieve was '-400', and the product not passing through the sieve was labeled '+400'.

(Table 5)

As can be seen from Tables 4 and 5, it can be seen that, in the case of an assembled product that did not pass through the sieve, the metal (nickel) of 77% or more in quality can be recovered without performing magnetic force sorting. In addition, in the case of the fine particles, it is understood that by performing the magnetic force selection, metals (copper) of 57% or more (based on metal, not metal oxide) can be recovered.

Further, examples of the heat treatment under the heat treatment conditions of Examples 2-3 to 2-10 are also similar to those of Example 2-1 and Example 2-2, which are similar to those of magnetic force sorting, sieving, sieving and magnetic force sorting The load was confirmed.

 While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, Those skilled in the art will recognize that many modifications and variations are possible in light of the above teachings.

Accordingly, the spirit of the present invention should not be construed as being limited to the embodiments described, and all of the equivalents or equivalents of the claims, as well as the following claims, belong to the scope of the present invention .

Claims (15)

A method for recycling a resin waste in which a metal coating layer is formed as a laminated layer in which two or more different metal layers are laminated,
a) cutting the resin waste;
b) separating and recovering the metal coating layer and the resin by magnetic force selection of the cut resin waste; And
c) thermally oxidizing a metal layer of the metal layer constituting the laminated layer, the metal layer being separated and recovered;
And a metal coating layer formed on the metal coating layer.
delete The method according to claim 1,
After step c)
d) applying a physical force to the laminated layer to peel off the metal remaining in the laminated layer and the metal oxide which is the metal layer oxidized in the step c). The method of claim 3,
After the step d)
and e) separating and recovering the metal and the metal oxide using magnetic force sorting. The method of claim 3,
A method for recycling a resin waste having a metal coating layer formed thereon, further comprising the step of dewining the mixture of the metal and the metal oxide obtained in the step d). 6. The method of claim 5,
A method for recycling a resin waste having a metal coating layer formed on a product passing through the sieve body, wherein magnetic force separation is further performed. A method of recycling a resin waste in which a metal coating layer is formed on a laminate in which two or more different resins are laminated,
a) cutting the resin waste;
b) separating and recovering the metal coating layer and the resin by magnetic force selection of the cut resin waste; And
d) separating and recovering resins different from each other by performing electrostatic separation on the resin separated and recovered in the step b);
And a metal coating layer formed on the metal coating layer. The method according to claim 1,
wherein the cutting of step a) is carried out with a size of 1 to 10 mm. The method according to claim 1,
The method for recycling a resin waste according to claim 1, wherein the metal coating layer is formed at 1000G to 6000G. The method according to claim 1,
Wherein the thermal oxidation is performed at 800-1000 < 0 > C in the presence of oxygen. The method of claim 3,
Wherein the application of the physical force is performed by a rod mill or a ball mill. 6. The method of claim 5,
Wherein the metal coating layer is formed using a sieve having a mesh size of 300 to 500 mesh. The method according to claim 6,
Wherein a metal coating layer is formed on the product passing through the sieve, wherein the metal coating is performed at 1000G to 4000G. The method according to claim 1,
Wherein the resin is a resin waste formed of an acrylonitrile-butadiene-styrene (ABS) resin, a polypropylene (PP) resin, a polyethylene (PE) resin, a polyvinyl chloride (PVC) resin or a laminate thereof. 14. The method according to any one of claims 1 to 13,
Wherein the metal coating layer comprises a metal coating layer comprising at least a copper layer and a nickel layer.

Images