JP2001239299A - Method for recycling paint refuse, container for recovering paint refuse and raw material for ironmanufacturing blast furnace manufactured from paint refuse - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for recycling paint refuse capable of easily treating at a low cost and of material recycling. SOLUTION: This method for recycling paint refuse comprises a step to recover paint refuse D by using recovering water, a step to accumulate and flocculate the recovered paint refuse D in a paint recovering basin, a step to recover the refuse D by using a pallet being a recovering container, a step to dehydrate the refuse D on the pallet, pretreatment to subdivide the refuse D into blocks by drawing partitioning plates out, a step to stably supply the subdivided refuse D by a screw extruder 6, a step to detect metallic foreign materials by a metallic foreign material detecting device 7, a step to heat, dry and granulate the refuse D by a twin-screw kneader 8, a step to continuously cool the granulated refuse and a step to deodorize bad smells generated at the respective steps. Namely, the paint refuse D having high adhesiveness is processed into the granulated dry paint refuse Dd to recycle it as a raw material for an iron-manufacturing blast furnace.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for recycling paint slag in a painting operation, a container for collecting the paint slag, and a steelmaking blast furnace raw material produced from the paint slag by the recycling method.

[0002]

2. Description of the Related Art Conventionally, in a conventional painting process, for example, in the case of painting a body of an automobile, an object to be painted, such as a vehicle body, is placed in a painting booth which is a closed space, and a thermosetting resin is applied from the surroundings. There has been a coating method in which coating is performed by spraying a paint containing the coating. Here, FIG. 12 is a diagram showing the procedure of a conventional method of collecting paint residue D and treating the same. FIG. 2 is a diagram illustrating in detail the coating booth 2 used for pretreatment in the method for recycling paint slag D according to the present embodiment. The painting process by paint spraying is the painting booth 2
According to the usual spray coating, the rate at which the paint adheres to the workpiece WK to be coated is approximately 20 to 3
At about 0%, even if electrostatic coating is performed, the adhesion rate cannot be set to 100%, and the remainder is paint residue D as work WK.
The wall 25 of the painting booth 2 shown in FIG.
In particular, there is a problem that it adheres to the floor surface 26. Therefore, an eliminator 31 is provided below the floor surface 26,
The recovery water WT is circulated from the paint recovery pond 3 to the paint recovery floor 27 of the coating booth 2 and, in some cases, the wall surface 25 to flow over the surface thereof. Air Ar was circulated toward the direction by the intake fan 24 so as to be blown, and the paint residue D, which could not adhere to the work WK, was mixed with the recovery water WT by the eliminator 31 to perform recovery. In this method, floating paint residue D
f and the settled paint residue Ds float or settle and accumulate, and are stored at regular intervals from the paint collection pond 3 into a pallet 205 which is a container for exclusive use by a manual force such as a scoop or a mechanical force by a bucket 4. Had been collected. This paint residue D generally has a calorific value of 3000 kcal to 6000 k.
Although it is as high as cal, it has high tackiness and is difficult to handle because it solidifies with the passage of time, and the water content is as high as about 60% on average. Moreover, there are significant differences in the situation. Furthermore, foreign substances such as bolts and nuts were sometimes included. Therefore, there are few ways to reuse this,
Generally, the paint residue D collected on the pallet 205 is spontaneously dehydrated by its own weight, and then the paint residue D solidified to some extent is divided into small pieces having a good combustion efficiency, and is incinerated in the incinerator 211. Thermal recycling was performed by recovering the heat generated.

[0003]

However, there is a possibility that metal foreign matters such as bolts and nuts are mixed in the paint residue D, and the paint residue D is reduced to a size having good combustion efficiency by a metal blade. Mechanical cutting to the maximum may damage the blade. For this reason, it was necessary to divide into large pieces by using a small heavy machine such as a forklift, and to further subdivide it manually using a rock drill or the like or a dedicated tool. Therefore, there is a problem that not only is it troublesome, but also the worker is forced to work hard. Also, 100% combustion cannot be achieved just because of the incineration treatment, and the incineration ash AS generated here has to be separately reclaimed. Further, there is a problem in that such processing increases the cost from 45 yen to 50 yen per kg. In the thermal recycling that incinerates the collected paint residue D, only heat can be recovered, but socially, it is possible to reuse the material itself and contribute to reducing the depletion of effective resources. Material recycling was desired.

An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide a method for recycling paint scum which is easy to process at low cost and is capable of material recycling.

[0005]

In order to achieve this object, a method for recycling paint slag according to the first aspect of the present invention is directed to a paint scum which is not applied to an object to be coated with a paint containing a thermosetting resin. A second step of collecting the paint residue collected in the first step into a predetermined collection container, and a coating step of collecting the paint residue collected in the second container in the second step. It is characterized by including a third step of subdividing the slag and a fourth step of heating, drying, hardening, and granulating the coating scum subdivided in the third step.

In the method for recycling paint residue according to this configuration, the paint residue is heated, dried, hardened, and granulated, whereby the paint residue loses tackiness and is easy to handle. The paint residue that could only be obtained can be reused as a recycled product, for example, a raw material for a steelmaking blast furnace as a substitute for coke. Therefore, material recycling that can be reused and contributes to reducing the depletion of effective resources, which is desired by society, can be achieved without discarding paint scum only by thermal recycling. .

According to a second aspect of the present invention, in addition to the configuration of the first aspect of the present invention, the third step includes a step of forming a box-shaped container body having an open top. A paint plate is subdivided by removing the partition plate of the collection container provided with a partition plate that divides the paint residue collected in the container body from the container body.

In the method for recycling paint residue according to this configuration, the conventional method has been divided into small pieces that can be processed by human hands. By using a collection container provided with a partition plate for dividing the paint plate, the paint plate can be subdivided by removing the partition plate from the container body, and the work of subdivision of the paint plate, which has been troublesome and labor intensive, is extremely difficult. Easy.

According to a third aspect of the present invention, in addition to the configuration of the first aspect of the present invention, the fourth step is performed by a twin screw kneader. It is characterized in that the paint residue is cured and granulated while drying.

In the method for recycling paint slag according to this configuration, it has not been used for treating paint slag conventionally.
By using the shaft screw kneader, the paint residue can be cured and granulated while drying. Therefore, maintenance is easy and simple equipment can process paint slag.
In addition, a plurality of steps of drying, curing, and granulating can be performed at once. Further, paint slag processed under desired conditions can be easily obtained only by changing the configuration, the number of revolutions, and the like of the twin-screw kneader.

[0011] According to a fourth aspect of the present invention, in addition to the configuration of the third aspect of the present invention, in addition to the configuration of the third aspect of the present invention, the finely divided paint slag is removed by a screw extruder. It is characterized in that a fixed amount is supplied to the twin screw kneader.

In the method for recycling paint slag according to this configuration, stable quality can be obtained by quantitatively supplying the paint scum fragmented in the third step to the twin-screw kneader using a screw extruder. At the same time, the filling rate of the twin-screw kneader can be increased and the most efficient production can be performed.

According to a fifth aspect of the present invention, there is provided a method for recycling paint slag according to any one of the first to fourth aspects of the present invention. The paint scum is transported by transport means having a metal detector disposed at a predetermined position, and when the metal detector detects a metal foreign material mixed in the paint scum, the foreign material of the paint scum is detected. And a step of discarding the portion including the

In the method for recycling paint scum according to this configuration, the paint scum fragmented in the third step is transported by transport means provided with a metal detector arranged at a predetermined position, and the paint scum is dispersed by the metal detector. When metal foreign matter mixed in the slag is detected, the portion of the slag containing the foreign matter containing the foreign matter is discarded by the disposal means. In addition, it is possible to eliminate an accident caused by foreign matter mixing in the fourth step of heating, drying, curing and granulating the paint residue.

According to a sixth aspect of the present invention, in addition to the configuration of the method for recycling paint slag according to any one of the first to fifth aspects, the paint scum is recycled in the fourth step. , Characterized in that it is formed in a granular shape having a diameter of 0.1 mm or more and 8 mm or less.

In the method for recycling paint scum according to this configuration, paint scum produced as a recycle product is formed into particles having a diameter of 0.1 mm or more and 8 mm or less.
For example, it can be easily used as a raw material of a steelmaking blast furnace as a substitute for coke, and material recycling can be achieved.

According to a seventh aspect of the present invention, a container for collecting paint slag used in the method for recycling paint slag is provided, in addition to the configuration of the container for collecting paint slag used in the method for recycling paint slag described in claim 2, Is provided with a box-shaped container body provided with a net plate at the bottom and a partition plate for dividing the paint residue collected in the container body, and the inner surface of the container body and the surface of the partition plate are provided with the coating material. A coating for enhancing the releasability from the slag is provided, and the partition plate is configured to be detachable from the container body.

[0018] In the container for collecting paint slag used in the method for recycling paint scum according to this configuration, the partition plate for dividing the paint scum collected in the container body is detachable from the container body, and the inner surface of the container body is provided. And since the surface of the partition plate is coated to enhance the releasability from the highly sticky paint residue, the paint residue contained in the container body is previously partitioned by the partition plate, and the partition plate can be easily separated. Since the paint residue can be pulled out, the paint residue can be easily divided.

According to the blast furnace raw material produced from the paint slag of the invention according to claim 8, the method for recycling paint slag according to claim 1 has a volatile component of 10% or less and a shape of 0.1 mm or more in diameter. , 8 mm or less.

In the steelmaking blast furnace raw material manufactured from the paint slag according to this configuration, the volatile component is 10% or less, and the shape thereof is formed into particles having a diameter of 0.1 mm or more and 8 mm or less. The desired performance as a substitute for coke can be exhibited.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION A method for recycling paint slag according to the present invention, a container for collecting paint slag, and recycling of paint slag D, which is a preferred embodiment of a steelmaking blast furnace raw material produced from the paint slag, are described below. The method and the recycling apparatus 1, pallet 5, steelmaking blast furnace raw material FR used for the method will be described.

The method for recycling paint slag D according to the present embodiment includes a step of collecting paint slag D in recovery water WT, a step of accumulating and collecting the collected paint slag D in the paint collection pond 3,
The process of collecting the paint residue D on the pallet 5 which is a collecting container, the step of dewatering the same, the process of pulling out the partition plate 52, the step of turning the pallet 5 and the process of collecting the pallet 5 are performed. A step of stably supplying the paint residue D fragmented by the pretreatment, a step of detecting metal foreign matter, a step of heating and granulating the paint residue D, a step of continuously cooling, For convenience, the following description will be made separately from the post-treatment including the step of removing the odor generated in each step of the post-treatment. FIG. 1 is a diagram showing a pretreatment step in a method for recycling paint slag D according to the present embodiment. FIG. 3 is a diagram showing a post-treatment step in the method for recycling paint slag D of the present embodiment.

The pre-processing will be described below with reference to FIGS. As shown in FIG. 1, a coating booth 2, which is a coating facility for an automobile, performs a process of collecting paint slag D in the recovery water WT. As shown in FIG. 2, the painting booth 2 is provided with a booth 21 that forms a space that can be sealed. The booth 21 has a work W, which is a body of an automobile, which is an object to be coated which has been subjected to a chemical conversion treatment, an undercoating or the like.
It moves on the conveyor 29 as K. A predetermined painting operation is performed on the work WK by a human or an industrial robot using a paint spraying device (not shown), and the paint is applied.

This paint is an oil paint containing an organic solvent containing a thermosetting resin, has a low viscosity at room temperature, and can be easily applied by spraying. 160 ° C for thermosetting resin
According to this paint, the work WK is cured by irradiating infrared rays or heating by high frequency to cure the thermosetting resin. Face can be obtained.

[0025] The sprayed paint, in a normal coating,
Adhesion rate to work WK is 20% to 30%, usually 2%
It is about 5%. Further, in order to increase the adhesion rate of the paint to the work WK, there is a method by electrostatic painting in which fine particles of the paint positively charged are attached to the work WK negatively charged by electrostatic force. The adhesion rate is about 40-60%, and all of the sprayed paint is
It is difficult to attach to K. The paint that could not be adhered to the work WK becomes a mist-like paint residue D and floats in the air while the wall surface 25 and the floor surface 2 of the booth 21.
6 will be reached.

A conveyor 29 is placed on the floor 26 of the booth 21.
Is provided, and the work WK is moved from outside the booth 21 to the booth 2
The workpiece WK is moved to a predetermined position for painting and stopped. The floor surface 26 on which the conveyor 29 is provided is formed of a mesh-shaped member, and can carry a person or the like. However, the floating mist-shaped paint residue D Can be passed. Below the floor surface 26, a paint collection floor 27 is provided. The paint recovery floor 27 is formed at an angle with respect to the horizontal plane so as to descend toward the center, and a cleaning device 34 having a venturi section 35 as an opening is provided at the center.

A supply path 22 composed of a pipe-shaped member from the paint recovery pond 3 is piped around a paint recovery floor 27 via a pump 32 for circulating the recovery water WT, and the pump 32 pumps water from the paint recovery pond 3. The recovered water WT is supplied around the paint recovery floor 27. The recovery water WT supplied around the paint recovery floor 27 flows down the surface of the paint recovery floor 27 so as to cover the surface of the paint recovery floor 27, and collects in a venturi section 35 provided at the center. Below the paint recovery floor 27, an eliminator 31 is provided, which is a pool-like paint scum D removal tank in which recovery water WT, which is ordinary industrial water, is stored. This eliminator 31 has a substantially airtight structure.

An intake fan 24 is provided on the ceiling of the booth 21. The intake fan 24 is driven by an electric motor to suck in outside air and forcibly introduce the outside air into the booth 21. On the other hand, the eliminator 31 is provided with an exhaust duct 37, and is arranged so as to be able to exhaust to outside air via an exhaust fan 38. An after filter 39 is provided at the end of the exhaust duct 38 to filter air exhausted to the outside.

The coating booth 2 and the paint collection pond 3 configured as described above have the following operations. Work WK
Of the paint sprayed against the paint W, the paint residue D floating without adhering to the work WK is caused to flow downward by the outside air sucked from above the booth 21, and the air in the booth 21 passes through the floor surface 26. Then, by touching the surface of the recovery water WT flowing down the surface of the paint recovery floor 27, it adheres to the recovery water WT. Therefore, the paint waste D does not adhere to the paint collection floor 27, and maintenance is basically unnecessary. The recovery water WT flowing down the surface of the paint recovery floor 27 causes the paint scum D to adhere and collects in the central venturi section 35. Here, an exhaust duct 37 is connected to the eliminator 31, and the exhaust fan 38 is forcibly evacuated. Therefore, the eliminator 31 having an airtight structure is decompressed and a negative pressure is applied, and gathers in the venturi section 35. The recovery water WT is supplied from the venturi section 35 to the eliminator 31.
Inhalation. At this time, the air in the booth 21 pressurized by the intake fan 24 is also sucked in, and the air Ar in the booth 21 and the recovery water WT are mixed and stirred together with the paint residue D floating in the air. Therefore, the paint residue D floating in the air is almost completely taken into the recovery water WT. Then, the paint in the booth 21 once mixed with the recovery water WT is used to collect the paint residue D by the recovery water WT, is cleaned, is filtered from the exhaust duct 37 by the exhaust fan 38 by the after filter 39, and is exhausted to the outside. Is done.

Although the recovery water WT flowing down into the booth 21 flows down only on the surface of the paint recovery floor 27 in the present embodiment, it may be structured so that the surface of the wall surface 25 also flows down. The paint residue D that is likely to adhere to the wall surface can also be collected, and the paint residue D can be prevented from attaching to the wall surface 25.

The recovery water WT from which the paint residue D has been recovered by the eliminator 31 flows down from the eliminator 31 to the paint recovery pond 3 through the outlet 23, and is stored in the paint recovery pond 3 for a predetermined time. Therefore, the recovery water W
The paint residue D mixed with T floats or settles and agglomerates to become a floating paint residue Df and a settled paint residue Ds. Then, the recovery water WT in which the content of the paint residue D has decreased is circulated again from the paint recovery pond 3 by the pump 32, and is supplied to the paint recovery floor 27 by a supply path 22 formed of a pipe-like member provided around the paint recovery floor 27. 27.

The paint of the present embodiment is oily and mostly does not dissolve in water. Therefore, when the paint is collected and stored in the recovery water WT, the fine paints adhere to each other and aggregate to form a lump. In addition, you may add a flocculant as needed. The aggregation of the paint slag D in this manner enables the collection of the paint slag D. The component having a relatively small apparent specific gravity floats on the surface of the water in the paint collection pond 3 to become a floating paint residue Df, and the component having a relatively large apparent specific gravity settles on the water bottom in the paint collection pond 3 and becomes a sedimentary paint residue Ds. Become. Floating paint slag Df accounts for about 80% of paint scum D. The floating paint residue Df has a water content of about 60%, and is relatively uniform in properties, but is soft, sludge-like or clay-like, has a high tackiness, and has poor handling properties. Therefore, it is difficult to carry and store the container as it is, and it is necessary to carry and store the container in a certain container. In addition, the sedimented paint residue Ds is
It accounts for about 20% of the entire paint residue D. Settling paint residue Ds
Has a variation in properties with a water content of 20% to 95%,
In particular, foreign matter such as metal foreign matter of bolts and nuts is likely to be mixed.

The floating paint residue Df is generated in a relatively large amount and floats on the water surface of the paint recovery pond 3 so that it can be easily recovered. Collect every day to every few days.
The bucket 4 is provided with a power opening / closing door 42 at a lower portion, and collects the floating paint residue Df in the main body 41 by closing the opened door 42 on the water surface. Then, the bucket 4 suspended by the moving rail 43 is raised and moved by a moving motor (not shown) to be transported to a predetermined position, and the bucket 4 is lowered again to open the opening / closing door 42 to release the floating paint. The slag Df is discharged downward.

On the other hand, the settled paint residue Ds sinks to the bottom of the paint collection pond 3 and is not normally collected. The drainage of the paint collection pond 3 is collected about once every six months to one year. .

The paint residue D collected from the paint collection pond 3 by the bucket 4 or by a human is stored on a pallet 5. Here, FIG. 4 is a plan view of the pallet 5, FIG. 5 is a side view of the pallet 5 viewed from the direction A in FIG. 4, and FIG.
FIG. 5 is a side view of the pallet 5 viewed from a direction B in FIG. 4. 7 is an exploded view of the pallet 5 shown in FIG. 6, and FIG. 8 is a cross-sectional view of the pallet 5 containing the paint slag D taken along a line CC in FIG. In FIG. 4, the vertical direction is called the length direction, the horizontal direction is called the width direction, and the direction perpendicular to the paper is called the height direction.

As shown in FIGS. 4 to 6, the pallet 5, which is a container for collecting the paint slag D, has an open upper part and is 1.5 m long, 1.2 m wide and 0.5 m high. A container body 51 having a substantially rectangular parallelepiped box shape and a mesh plate 54 provided horizontally at a predetermined distance from the bottom surface (see FIG. 8) are collected on the mesh plate 54 inside the container body 51. Paint residue D
7, a mesh plate 54 is horizontally inserted into and fixed to the container body 51 as shown in FIG.
The partition plate 52 is placed on the assembly 4 and assembled.

As shown in FIGS. 5 and 6, the container main body 51 has a flange portion 5 having a peripheral edge at an upper end thereof extended 45 degrees outward.
1a. The flange portion 51a serves as a guide for guiding the lower end portion of the partition plate 52 when the partition plate 52 is inserted into the container main body 51 (see FIG. 8). At the same time, it plays a role of increasing the strength of the container body 51. As shown in FIG. 4, near the four corners of the flange portion 51a, inverted U-shaped hook portions 55a, 55b, 55c, and 55d for suspending the pallet 5 with wires or the like are provided as shown in FIGS. Are respectively protruded upward. In addition, on the left side surface of the container body 51 shown in FIG. 4, a drain port 57b penetrating therethrough (see FIG. 8) is provided at the lower right corner shown in FIG. Drainage ports 57a are respectively provided. Then, as shown in FIGS. 5 and 6,
A quarter of the length from the lengthwise end of the outer bottom surface of the container body 51 is approximately one-quarter of the length, and has a length substantially equal to the width of the bottom surface of the container body 51 extending parallel to the width direction. Leg portions 56a and 56b, which are a pair of elongated plate-shaped members, are provided. As shown in FIG. 5, the leg portions 56a and 56b are open at both ends in the width direction, and a fork of a forklift (not shown) is placed below the bottom surface of the container body 51 from the installation surface on which the container body 51 is mounted. Plays a role in forming a space in which the card can be inserted.

As shown in FIG. 8, inside the container body 51, a bar-shaped net plate supporting portion 51b projecting inward is provided at a position approximately one-fourth the height from the bottom surface. Is provided horizontally in a ring shape. The mesh plate supporting portion 51b fixes the mesh plate 54 with a fixing means (not shown) such as welding or a bolt and a nut, supports the mesh plate 54 at a predetermined height, and connects the mesh plate 54 with the bottom surface of the container body 51. A drainage chamber 58 which is a space for facilitating drainage is formed therebetween. The mesh plate 54 is connected to the container body 5.
1 covers the bottom of the mesh plate 54 without any gap, and serves to prevent the paint residue D from entering below the mesh plate 54 even when the paint residue D is put on the mesh plate 54. Also, this mesh plate 54
Expanded metal or the like formed by forming a large number of cuts in a metal plate and extending to form a mesh is preferably used. of course,
The material is not limited to expanded metal as long as the paint residue D does not enter the drainage chamber 58 and is capable of draining. It can also be configured with a superior sheet. The mesh plate 54 configured as described above plays a role of supporting the supplied paint scum D and separating the moisture of the paint scum D to reduce the water content of the paint scum D. The moisture of the paint residue D put on the pallet 5 is separated by the mesh plate 54, and the separated water flows down to the drain chamber 58 and is drained from the drain port 57 to the outside of the container body 51.

As shown in FIG. 4, the partition plate 52 is positioned such that the four plate members 521a, 521b, 521c, and 521d are oriented such that their width directions are vertical (see FIG. 6). The container body 51 is arranged so that its longitudinal direction is parallel to the length direction of the container body 51 so as to be parallel. On the other hand, the posture is such that each width direction is a vertical direction (see FIG. 5), and the longitudinal direction is the width direction of the container body 51.
Sheet members 522a, 522b, 522c, 522
d, 522e are likewise arranged in parallel. Then, the plate members 521a, 521b, 521c, 521d and the plate members 522a, 522b, 522c, 522d, 522e.
Are combined so that the plan view becomes a lattice shape. Each of the plate members 521a, 521b, 521
c, 521d and plate members 522a, 522b, 522
c, 522d, and 522e are arranged at intervals so as to partition the inside of the container body 51 at equal intervals. That is, pallet 5
Is configured like an ice tray in a general household refrigerator as a whole. In addition, each plate-shaped member 521a
To 521d and 522a to 522e may be formed continuously or separately. Then, the respective plate members 521a to 521d and 522a to 52
As shown in FIG. 7A, 2e is formed such that its thickness becomes thinner toward the lower end (see FIGS. 5 and 6). Therefore, the partition plate 52 can be easily removed from the container body 51 even when the paint residue D is charged as shown in FIG. As shown in FIGS. 4 to 6, when the partition plate 52 is pulled out of the container body 51, fork hooks 53a to 53d for hooking a fork of a forklift (not shown) are provided with plate members 521a, 521 in the longitudinal direction.
It is provided before and after the upper end of 21d, respectively. The fork hooks 53a to 53d are, as shown in FIG.
A forklift forklift is inserted inside the gate, and the fork is lifted up.
The partition plate 52 can be further removed.

As described above, the container body 51 and the partition plate 5
2. Since the pallet 5 composed of the mesh plate 54 is a member made of iron, the entire surface is treated with a coating, a chemical conversion treatment, an oxide film or the like so that the surface is not oxidized or corroded. Further, since the paint residue D, especially the floating paint residue Df, has a strong adhesiveness, it adheres to the entire inner surface of the container body 51 of the pallet 5 above the mesh plate supporting portion 51b, the entire surface of the partition plate 52, and the entire mesh plate 54. These parts are coated with a coating that enhances peelability. Examples of the coating material include a fluororesin, polytetrafluoroethylene (PTFE), and a tetrafluoroethylene-perfluoroalkylvinyl ether copolymer (PF).
A), tetrafluoroethylene-hexafluoropropylene copolymer (PTP), tetrafluoroethylene-ethylene copolymer (ETFE), polychlorotrifluoroethylene (PCTFE), chlorotrifluoroethylene-ethylene copolymer (ECTFE) , Polyvinylidene fluoride (PVDF), polyvinyl oxide (PV
F) and the like. More specifically, Teflon (registered trademark) of Mitsui DuPont Fluorochemicals Co., Ltd., Daiflon (registered trademark) of Daikin Industries, Ltd., Aflon CPD (registered trademark) of Asahi Glass Co., Ltd., Kureha of Kureha Chemical Industry Co., Ltd. KF Polymer (registered trademark) and the like. Further, the material of the coating is not limited to the above-mentioned fluororesin as long as it is a material having excellent releasability, and it goes without saying that the coating can be made of other materials. In the present embodiment, the coating is performed by Teflon (registered trademark) of Mitsui-Dupont Fluorochemicals Co., Ltd.

The coating for improving the releasability is not limited to the coating directly applied to the inner surface of the container body 51 of the pallet 5, but may be a film, a thin plate, or another material using the above-mentioned material for improving the releasability. The thin plate is coated with a container body 51 of the pallet 5.
May be attached to the inner surface of the device by bolts and nuts or attached by an adhesive. The point is that the paint residue D contained in the pallet 5 does not easily adhere to the pallet 5 and can be easily removed from the pallet 5.

Using the pallet 5 configured as described above, a step of collecting the paint residue D into the pallet 5 which is a collection container, a step of dewatering the same, a step of pulling out the partition plate 52, and inverting the pallet 5 FIG. 4 shows the process until the paint residue D is subdivided by each process of the process and the process of collecting the pallet 5.
The description will be made along FIG. 1 with reference to FIG. The process of collecting the paint residue D on the pallet 5, which is a collection container, is performed as follows. As shown in FIG. 1, the floating paint residue Df floating on the water surface of the paint recovery pond 3 is generated in a relatively large amount and is not solidified immediately after it is generated. . Therefore, the floating paint residue Df is recovered by using a mechanical recovery means such as the bucket 4. In order to collect the floating paint residue Df from the paint collection pond 3 using the bucket 4, first, the door 42 of the bucket 4
Is displaced downward to be in an open state. Then, the bucket 4 is moved along the rail 43 so that the floating paint residue Df enters between the doors 42. The horizontal position is determined, the bucket 4 is moved downward, and the floating paint residue Df is put between the doors 42. Then, the opening / closing door 42 is displaced upward to store the floating paint residue Df in the bucket body 41 with the opening / closing door 42 closed. Wait for the water to flow out for a while in that state, and when the water has flowed out, raise the bucket 4, move it along the rail 43 and move it over the pallet 5, lower the bucket 4, and open and close it above the pallet 5. The door 42 is opened to drop the floating paint residue Df downward.

At this time, the floating paint residue Df dropped on the pallet 5 has a relatively low viscosity and gradually enters the pallet 5 by its own weight. Floating paint residue D dropped
As shown in FIG. 8, f is put into any of the squares divided by the grid-like partition plate 52. Then, an amount is supplied so that the floating paint residue Df becomes uniform at each of the squares, and the upper end of the supplied floating paint residue Df does not exceed the flange portion 51a. In this manner, the floating paint residue Df input by hand or by the mechanical force of the bucket 4 or the like is supported by the mesh plate 54 on the lower side and the partition plate 52 on the side.
It is supported and held by. At this time, the moisture contained in the floating paint residue Df is separated by the mesh plate 54, and only the moisture passes through the mesh plate 54, flows down to the drainage chamber 58, and further flows out of the pallet 5 from the drain ports 57a, 57b. It is discharged outside.

On the other hand, the viscosity of the sedimentary paint residue Ds varies greatly depending on the properties of the paint itself, the contained moisture, the elapsed time since generation, the temperature environment of the paint recovery pond 3 and the work area, and the like. Here, the sedimented paint residue Ds is obtained by replacing the circulating recovery water WT about once every six months to once a year.
In order to recover s, there is also a settling paint residue Ds that has been left for a maximum of one year, and generally has a remarkably high and low viscosity and unstable properties. For this reason, the sedimented paint residue Ds is collected using a small heavy machine when the viscosity is high, or manually collected when the viscosity is low.

Next, the step of dehydrating the paint residue D will be described. The paint residue D stored in the pallet 5 as described above drops its own weight and the water contained by the action of the mesh plate 54 into the drainage chamber 58 over time, and the dewatering proceeds. As the dehydration progresses, the paint residue D solidifies as the viscosity further increases. When the dehydration is completed after a predetermined time has elapsed, a step of pulling out the partition plate 52 is performed. The withdrawal of the partition plate 52 is performed by using a fork of a forklift with fork hooks 53a, 53b, 53c, 53d (FIG.
(See FIG. 5). At this time, since the partition plate 52 is coated to enhance the releasability, the partition plate 52 can be easily peeled off without sticking to the highly adhesive paint residue D, and the partition plate 52 can be easily pulled out from the paint residue D. Next, a step of inverting the pallet 5 is performed. The reversal is performed by hooking the tip of a fork of a forklift at one end of the bottom of the pallet 5 and raising the pallet 5 to rotate the pallet 5 to thereby store the paint residue D contained therein.
And flip it over. Needless to say, if a dedicated facility for reversing the pallet 5 is provided, the work efficiency can be improved.

Next, a step of collecting the pallets 5 is performed.
Collection of the pallet 5 is performed by inserting a fork of a forklift into the opening of the legs 56a and 56b of the inverted pallet body 51 and lifting the same. When a fork of a forklift is inserted into the openings of the legs 56a and 56b of the inverted pallet 5 and lifted, the inner surface of the container body 51 and the mesh plate 54 provided at the bottom thereof are coated with a coating for improving the releasability. As a result, the pallet 5 can be easily recovered from the paint residue D without sticking to the highly sticky paint residue D. When the pallet 5 is collected in this way, the paint residue D that has already been subdivided by the partition plate 52 and has been dehydrated and solidified is obtained. That is, the step of pulling out the partition plate 52, the step of inverting the pallet 5, and the step of collecting the pallet 5 complete the step of subdividing the paint residue D. The finely divided paint residue D is approximately 30 cm in length and 20 c in width.
m, a block of about 20 cm in height, weighing about 10 to 15 kg. Therefore, it is possible to shift from this state to the quantitative supply in the process described later.
As a result, there is no need to use a heavy-duty machine such as a forklift to divide the machine into large pieces, and to use a dedicated tool such as a rock drill to perform the subdivision processing manually, which saves labor and reduces labor. Is done. The finely divided paint residue D is approximately 30 cm in length, 20 cm in width,
Since the height is about 20 cm and the weight is made uniform to about 10 to 15 kg, the processing in the post-processing step becomes easy and efficient. Thus, the pre-processing of the recycling method according to the present embodiment is completed.

Next, the paint residue D divided by the pretreatment is
The post-processing of the method for recycling the paint residue D according to the present embodiment, which is heated, dried, cured, and granulated, will be described. The post-processing includes, as shown in FIG. 3, a step of stably supplying the paint scum D finely divided by the pre-treatment, a step of metal foreign matter detection, a step of heating and granulating the paint scum D, a step of continuous cooling, And a step of removing the odor generated in each step of the post-treatment. Hereinafter, each step and an apparatus used in the step will be described.

The process of stably supplying the paint residue D divided by the pretreatment will be described. A well-known single-screw screw extruder 6 can be used as a device for stably supplying the screw. The screw extruder 6 has a barrel 65 having a cylindrical space in a main body 61, a screw 66 in the barrel 65, and a motor (M) 62 reduced in speed by a gear box (GB) 63. It rotates with driving force. When the finely divided paint residue D is manually input into the hopper 64, the paint residue D is transported in the barrel 65 by the screw 66. By making the rotation of the screw 66 constant, the paint residue D can be supplied to the next step in a fixed amount at a constant time. In addition, by changing the rotation speed of the screw 66, it is possible to adjust the input amount. Therefore, while stabilizing the quality in each of the subsequent metal foreign matter detection step, the step of heating and granulating the coating residue D, and the step of continuously cooling, the processing capacity is maximized by increasing the filling rate. Becomes possible. Of course, it goes without saying that a system in which the finely divided paint residue D is automatically fed without manual operation can be used.

In the step of stably supplying the finely divided paint scum D, the pulverized paint scum D is fed into the metal foreign matter detection step. In the step of metal foreign matter detection, a metal foreign matter detection device 7 is used. The metal foreign matter detection device 7 includes a conveyor 72 serving as a conveyance unit, a metal detector 71, and a disposal unit 7.
And 3. The paint slag D pulverized by the screw extruder 6 is supplied and conveyed onto a conveyor 72 as a conveying means, and the metal mixed into the paint slag D pulverized by the well-known metal detector 71 in the conveying process. Detect foreign objects. Here, the quality of the product and the diameter of 10 m, which is an obstacle in the step of granulating the coating residue D by heating and drying, are described.
The purpose of the invention is to eliminate metallic foreign matter having a diameter of about 6.5 mm or more, but in consideration of safety, metallic foreign matter having a diameter of about 6.5 mm can be detected. At a predetermined distance downstream of the metal detector 71 in the conveying direction of the conveyor 72, a disposal unit 73 for removing a certain portion of the paint residue D on the conveyor 72 and discarding it is provided.
The discarding means 73 includes a swingable plate member driven by, for example, a solenoid, a hydraulic cylinder, or the like. Usually, the plate member is not located on the conveyor, but in a predetermined case, the plate member is This is such that paint residue D projecting upward and being conveyed is removed from the conveyor and guided to a disposal position outside the conveyor 72. And the metal detector 7
When a metal foreign object is detected by the control unit 1, the control unit (not shown) detects the metal foreign object, calculates the time required for the metal foreign object to be conveyed to the position of the discarding unit 73 by the conveyor 72, based on the transport speed. By operating 73, the paint residue D containing the metallic foreign matter is discarded. By this metal foreign matter detection step, it is possible to prevent an accident in the step of heating and drying and granulating the paint scum D, and to improve the quality of a product produced.

The paint residue D from which the metal foreign matter has been removed in the metal foreign matter detection step proceeds to a step of heating and drying to granulate. The step of granulating by heating and drying is carried out by using the crushed paint residue D
Is a step of drying by heating, and processing into a granular shape while curing the thermosetting resin. In this step, a well-known twin-screw kneader 8 is used. In this embodiment, a twin-screw kneader TE of Japan Steel Works, Ltd.
The X series is used.

Hereinafter, the structure of the twin-screw kneader 8 will be described. Here, FIG. 10 is a schematic diagram showing the internal configuration of the twin-screw kneader 8. Screw 86
The two pairs of screws 86 are arranged so as to mesh with each other, and are arranged in parallel in two rows. The kneading disk 87 has a substantially elliptical shape and meshes inside the barrel 85. The paint residue D is compressed by the pair of kneading disks 87 and kneaded while being sheared. As shown in FIG. 3, a heater 89 is provided around the barrel 85 so that the barrel 85 can be heated. The heater 89 is configured by a ceramic heater, Nichrome (registered trademark) wire, or the like, and can raise the temperature of the paint residue D in the barrel 85 to about 400 ° C. Note that the heater 89 serving as a heating unit is
Heating by high-frequency heating or another heating method may be used.

As shown in FIG. 10, there are the following types of barrels 85 constituting the twin screw kneader 8. Basically, it is constituted by a plurality of closed barrels 85b having no opening except in the front-rear direction.
A feed barrel 85a having an open upper portion is provided. In addition, a dewatering barrel 85d, which is open at the lower side, is disposed as necessary, in order to drain the water generated by the compression, following the feed barrel 85a. In addition, a vent barrel 85c having an open upper portion is disposed at one or more locations to release water vapor generated by heating and gas generated from other volatile components.

In the barrel 85, a screw 86 (full flight) is basically arranged. Further, at the position where the dewatering barrel 85d is disposed, the forward kneading disk 87a is disposed, and the orthogonal kneading disk 87b is disposed continuously in the downstream direction. With such a configuration, the paint residue D transported in the transport direction by the screw 86 is sheared, agitated, and compressed by the forward kneading disk 87a. Further, since the orthogonal kneading disk 87b has larger shearing force and compressive force, the dewatering action is greatly exerted at this position. Further, the forward kneading disc 87a is also arranged at the position of the vent barrel 85c, and the orthogonal kneading disc 87b is arranged continuously in the downstream direction. Here, the heating proceeds, and a gas is mixed into the paint residue D. In order to release this gas, the paint residue D is agitated and compressed by the forward kneading disk 87a and the orthogonal kneading disk 87b. It releases the gas inside to the outside. The schematic diagram shown in FIG. 10 shows one example of the twin-screw kneader 8, and the vent barrel 85
c, dewatering barrel 85d, screw 86, forward kneading disk 87a, orthogonal kneading disk 87
b, the rotation speed of the shaft, the heating temperature, etc. are shown in FIG.
Are not limited to the configuration of the example shown in FIG. 1, but may be appropriately changed depending on the specifications such as the particle size and the water content of the steelmaking blast furnace raw material FR to be produced, the components of the paint slag D as a raw material, the water content, the viscosity and the like.

The process of drying and granulating the coating residue D by the twin-screw kneader 8 having the above-described structure will be described with reference to FIGS. First, as shown in FIG. 3, the paint residue D having undergone the metal foreign matter detection step is put into the hopper 84 of the twin-screw kneader 8 by the conveyor 72 of the metal foreign matter detection device 7. The paint residue D put into the hopper 84 is fed from the opening of the feed barrel 85a of the twin-screw kneader 8 through the screw 86 as shown in FIG.
, Are sequentially taken into the feed barrel 85a. The paint residue D taken into the feed barrel 85a is shown in FIG.
Is heated by the heater 89 shown in FIG. 4 and the temperature in the barrel rises from room temperature to a predetermined processing temperature. Next, as shown in FIG. 10, the paint residue D pulverized by the relatively thick forward kneading disk 87a is further sheared. Then, the contained water compressed and kneaded is pushed out to the outside by the orthogonal kneading disk 87b, and is dropped downward. Here, the dewatering barrel 85d is used as the barrel 85 to drain the water of this liquid.

Then, the paint residue D is also
Is transported while being heated. At this time, heating is performed at, for example, 150 ° C., in a range not exceeding 100 ° C. at which drying efficiency is high and not exceeding 160 to 170 ° C. at which the thermosetting resin contained in the paint slag D is not cured. 10 by heating
When the temperature exceeds 0 ° C., a large amount of gas such as water vapor is generated in the paint slag D. Therefore, the gas is again sheared and stirred by the forward kneading disk 87a, and
The so-called degassing is carried out by compressing, kneading and pushing out the contained gas such as water vapor to the outside of the paint residue D. At this time, since the shape of the paint residue D is finely divided as compared with the kneading with the preceding kneading disk 87a and the orthogonal kneading disk 87b, the forward kneading disk 87a and the orthogonal kneading disk used at this time are divided. The thickness of 87b is finely divided by using a thinner disk than in the previous kneading. This venting is repeated as needed. When degassing, if necessary,
The barrel 85 is a vented barrel 85c having a gas outlet at the top instead of the closed barrel 85b.
Is used. The selection of the barrel 85 takes into consideration the amount of gas generated, the set temperature, and the like. When the unnecessary gas is sufficiently released from the paint residue D to reduce the water content to 5% or less, the temperature is increased and the process of curing the paint residue D is started.

In the process of curing the coating residue D, the curing temperature of the thermosetting resin contained in the coating residue D is 160 to 170 ° C., so that the temperature is raised to about 200 ° C. In addition, the screw 86 is rotated at a high speed of about 200 rotations per minute so that the particle size does not increase during the curing process. By rotating the screw 86 at high speed in this way, the paint residue D is rotated by the rotational force of the screw 86, and a sand-like cured dry paint residue Dd having a particle size of about 2 mm can be obtained. The particle size can be controlled by controlling the heating temperature at this time, the number of rotations of the screw 86, the lead (length) of the screw 86, the screw diameter, the depth of the groove, and the like. Properties and shapes such as dango-like and powder-like can be used.

After the step of heating and granulating the coating residue D as described above is completed, a step of continuously cooling the coating residue D is performed as necessary. In the present embodiment, since the paint slag D is heated to about 200 ° C. in the step of heating and drying and granulating, the dried paint slag D which becomes the raw material FR of the steelmaking blast furnace immediately after production.
d is also very high temperature. Therefore, the twin screw kneader 8
Is cooled by the slag continuous cooling device 9. The slag continuous cooling device 9 uses a screw having the same configuration as the screw 86, and the barrel 85 forcibly cools by circulating a refrigerant around it. As the refrigerant, water, ammonia, or the like is used. With water cooling, the equipment can be cooled simply and at low cost, and with ammonia or the like, a compressor or the like is required, but efficient cooling can be performed.

As for the cooling method, in addition to providing such a dedicated cooling device, the twin-screw kneader 8
A dry paint residue Dd, in which the barrel set at a low temperature of 30 to 80 ° C. is provided continuously to the barrel used in the step of heating and drying and granulating, and the step of heating and granulating is completed.
It is also possible to carry out cooling while continuously transporting with a screw without discharging to the outside. In addition, without using a barrel, dry paint residue Dd from the twin screw kneader 8 as it is.
May be discharged and cooled by air cooling by a fan, or natural cooling may be waited. When the dry paint residue Dd is sufficiently cooled, the continuous cooling step is terminated, but the continuous cooling step may be omitted.

When the continuous cooling process is completed, the dried paint residue Dd is packed in a bag or the like, and is packaged so that it can be shipped.

In each of the post-treatment steps, since the paint slag D contains an organic substance, which is a component of the paint, as a volatile component, an odor is generated even if it is left as it is. In particular, in the heating and pulverizing steps, many volatile components are diverged, causing a bad smell. Therefore, in a process where odor is likely to be generated, a deodorizing process is also performed. Deodorizing device 1
0 is a fan 103, an ozone generator 104, a packed tower 1
06, etc., and the intake ports 101a, 101b, 10
The air sucked from the ducts 1c and 101d through the duct 102 is deodorized. Here, FIG. 9 is a schematic diagram illustrating the deodorizing device 10 in detail.

As shown in FIG. 3, the suction port 101a is provided in the vicinity of the hopper 64 of the screw extruder 6 in the step of stabilizing the supply. The reason why the intake port 101a is provided here is that the paint residue D, which has been divided and blocked in the pretreatment, is pulverized by the screw extruder 6, so that volatile components of the organic matter contained therein are easily diverged. is there. The intake port 101b is provided near the exhaust port of the vent barrel 85c of the twin-screw kneader 8 in the step of granulating by heating and drying. The reason why the intake port 101b is provided here is that a large amount of volatile components emanate from the paint residue D by heating.
If the intake port 101b is in direct and closed communication with the exhaust port of the vent barrel 85c, the odor source can be efficiently captured.
The intake port 101c is provided with the continuous cooling device 9 for the continuous cooling process.
Is provided in the vicinity of. The intake port 101c is provided here because the dry paint residue D discharged from the twin-screw kneader 8
d is because it is heated at a high temperature close to 200 ° C., so that the malodorous component that evaporates at the high temperature emanates. And
The intake port 101d is provided at a place where the dry paint residue Dd is packed. This is because odor still occurs at this position, and this is for improving the working environment. Of course, the intake port 101 may be provided at a position other than this. Each of the intake ports 101a to 101d is connected to the duct 1
02 communicates with the fan 103.

Next, a description will be given with reference to FIG. Fan 1
Numeral 03 inhales air Gd to be deodorized from the duct 102 and exhausts it from the duct 110 to the packed tower 106. Also,
An ozone generator 104 is provided to generate ozone, and the ozone gas mixing pipe 107 is connected to the ozone generator 104.
And ozone gas OzG mixed with air Gd taken in from each of the air inlets 101a to 101d to deodorize. At this stage, a considerable amount of organic odor components are deodorized by ozone. Then, the air Gi further mixed with the ozone gas OzG is supplied from the air supply port 106 b to the packed tower 10.
6 is supplied into the packed tower 106 from the lower part.

Further, tap water Ws is supplied from a water supply facility such as industrial water or an industrial water reprocessing facility (not shown) through the water suction pipe 108. At this time, the ozone generator 1
04 dissolves ozone gas in water to generate ozone water OzW, and an ozone water mixing pipe 105 connected to a water absorption pipe 108.
Thereby, the ozone water OzW is mixed into the tap water Ws. Tap water Wi mixed with ozone water OzW is supplied to the water supply port 106.
c, water is supplied from the upper part of the packed tower 106.

The packed tower 106 is provided inside a shell 106a formed of a cylindrical case made of metal such as stainless steel.
The insoluble solid fillers 106g and 106i are supported by the filler support plate 106j and provided in a layered form.
Between 06g and 106i, a liquid redistribution plate 106h for redistributing the flowing liquid is provided. 106 g of filling,
106i is formed of a plastic or metal member that has a large surface area and a large porosity, is lightweight, has high mechanical strength, and is not corroded by liquids and gases so that the gas-liquid contact area is increased.

Water supply port 1 provided above packing tower 106
Ozone water O supplied from 06c to the top of the packed tower 106
The tap water Wi mixed with zW is diffused by the liquid distributor 106f branched into many branch pipes and flows down in the packed tower 106. The tap water Wi mixed with the ozone water OzW diffused by the liquid distributor 106f is filled with the fillings 106g, 1
The liquid flows down in the form of a liquid film while wetting the surfaces of the packings 106g and 106i while redistributing through the gap of 06i and being redistributed on the way by the liquid redistribution plate 106h. On the other hand, the air inlet 106
b. Ozone gas O supplied from the lower part of the packed tower 106
The air Gi mixed with zG flows from the bottom of the column to the packing 106.
g, 106i rises while being in contact with the liquid film. Therefore, the malodorous component of the air Gi sucked from each of the intake ports 101a to 101d and mixed with the ozone gas OzG is ozone deodorized by the tap water Wi mixed with the ozone water OzW. Each intake port 101 deodorized through such a process
The air Go sucked in from a to d is discharged to the atmosphere from an exhaust port 106d. Further, the water Wo in which the malodorous component oxidized and rendered harmless by the ozone is dissolved is discharged from the drain port 106e and sent to the reprocessing facility.

The deodorizing apparatus 10 has a liquid-phase dispersion type spray tower, a fluidized bed absorption tower,
One using a plate tower, or a gas-phase dispersion type column tower,
Various types such as those using a bubble column and a stirring tank can be selected. It is to be noted that the work environment and the external environment are desirable when practicing the invention, but are not necessarily essential for practicing the invention.

The apparatus 1 for recycling paint slag D according to the present embodiment is configured as described above, and the method for recycling paint slag D is performed as described above. Therefore, the following effects are obtained. That is, the coating residue D is heated, dried and cured to lose the tackiness, and is formed into a sand having a particle size of about 2 mm, so that the handling becomes easy. There is an effect that D can be reused, for example, as a steelmaking blast furnace raw material FR as a substitute for coke. As a result, material recycling that can be reused and contributes to reducing the depletion of effective resources has been achieved in society, which is desired by society without having to dispose paint dregs D only by thermal recycling. It has the effect of being able to.

Here, the steelmaking blast furnace raw material FR as a substitute for coke will be described. Conventionally, in the production of pig iron by a steelmaking blast furnace, coke is introduced into a blast furnace together with iron ore, limestone, scrap iron for component adjustment, etc., and the carbon component of the coke reduces iron ore, which is iron oxide, to convert its oxygen into carbon dioxide. It played a role of discharging carbon as a component of blast furnace gas. Here, as a component of the dry paint residue Dd,
It was found that carbon and hydrogen were the main components, and the dried paint slag Dd had a sufficient function for reducing iron ore in the ironmaking blast furnace. In this case, the conditions desired as the raw material for the steelmaking blast furnace are such that the volatile component is 10% or less, has no tackiness, does not contain any foreign matter, and has a particle size of 8 mm or less. Here, the dried paint residue Dd of the present embodiment
As can be seen from the above, the volatile component is sufficiently reduced to 10% or less during the drying process, and the thermosetting resin is cured by heating and loses its tackiness. Further, since the metal foreign matter detection device 7 has undergone a process of detecting a metal foreign matter,
No foreign matter is mixed in the dried paint residue Dd. Then, in the step of heating and drying and granulating the coating residue D by the twin-screw kneader 8, the screw 86 is rotated at a high speed so that the particle diameter is formed to about 2 mm. Of course, the particle size can be controlled as described above. In view of the above conditions, the dry paint residue Dd has all the conditions as the steelmaking blast furnace raw material FR, and the paint residue D is processed by the recycling apparatus 1 of the present embodiment to form the dry paint residue Dd. It can be seen that the paint slag D can be recycled as the steelmaking blast furnace raw material FR.

In the method for recycling paint residue D according to the present embodiment, the pallet 205 (FIG.
5), the paint residue D is subdivided into a size that can be processed.
By using the pallet 5 which is a collecting container provided with a partition plate 52 for dividing the paint residue D collected into the container body 51, the paint residue D is subdivided by removing the partition plate 52 from the container body 51. There is an effect that can be.
In particular, since the inner surface of the container body 51, the surface of the partition plate 52, and the surface of the mesh plate 54 are coated to enhance the releasability from the highly adhesive paint residue D, the partition plate 52 can be easily pulled out. Can be. Therefore, there is an effect that the work of dividing the paint residue D, which has been complicated and heavy labor, can be extremely easily performed.

Further, in the method for recycling paint slag D of the present embodiment, the paint slag D is dried while using the twin-screw kneader 8 which has not been used for the treatment of the paint slag D. There is an effect that it can be cured and granulated. Conventionally, in order to pulverize, dry, harden, pulverize, and pulverize, multi-stage processing was performed by a dryer, a rotary cutter, etc. in addition to the single-screw extruder, but in the present embodiment, In the step of granulating the coating residue D by heating, drying, hardening, and granulating, there is an effect that a plurality of steps of drying, curing, and granulating can be performed in one stage with simple equipment that is easy to maintain. Also, a twin screw kneader 8
There is also an effect that the paint residue D processed under desired conditions can be easily obtained only by changing the configuration, the number of rotations, and the like.

In the method for recycling paint slag D according to the present embodiment, the paint scum D finely divided in the pretreatment is conveyed by the screw extruder 6 to the conveyor 72 of the metal foreign matter detecting device 7.
By supplying the paint residue D to the twin-screw kneader 8 via a fixed amount, stable quality can be obtained,
There is an effect that the filling rate of the twin screw kneader 8 can be increased and the most efficient production can be performed.

In addition, in the method for recycling paint slag D according to the present embodiment, paint slag D that has been fragmented in the pretreatment and crushed by the screw extruder 6 in the process of stable supply is placed at a predetermined position. When the metal detector 71 detects metal foreign matter mixed in the paint residue D, the portion containing the foreign matter in the paint residue D is discarded. Since the waste is discarded by the means 73, there is an effect that the quality can be improved without containing foreign matter in the recycled product of the paint slag D to be produced. In addition, there is also an effect that an accident due to foreign matter mixing in the step of heating and drying and granulating the paint residue D by the twin-screw kneader 8 can be eliminated.

Although the present invention has been described with reference to one embodiment, the method for recycling paint scum of the present invention is not limited thereto. For example, in the recycling apparatus 1 according to the present embodiment, the paint residue D, which has been subjected to the pretreatment and has been finely divided, is pulverized by the screw extruder 6 and after a step of stably supplying, the metal foreign matter detection device 7 The metal foreign matter detection process is performed, but this process may be the following process. Here, FIG. 11 is a diagram showing steps of a modification of the recycling method of the present embodiment. FIG.
As shown in FIG. 1, the pretreatment is completed, and the finely divided paint residue D is first subjected to a metal foreign matter detection step by a metal foreign matter detection device 7 and then pulverized by a screw extruder 6 to achieve stable supply. Perform the process. That is, when the finely divided paint slag D is pulverized by the screw extruder 6 and supplied to the metal foreign matter detecting device 7, the pulverized paint slag D is not yet cured and has high adhesiveness. Therefore, depending on the material of the conveyor 72 of the metal foreign matter detection device 7, the metal foreign matter detection device 7 may adhere to the conveyor 72 and make the processing difficult. In such a case, since the paint residue D divided into blocks in the pre-processing has a smaller adhesive strength, the processing is performed in the order in which the metal foreign matter detection process is performed first, so that the conveyer 72 can be transferred to the conveyor 72. The adhesion of the paint residue D can be prevented.

Further, in the recycling method of the present embodiment, the steelmaking blast furnace raw material FR as a substitute for coke is produced as a recycled product using the dry paint residue Dd, but the recycled product is not limited to the steelmaking blast furnace raw material FR. By satisfying the predetermined conditions, the dry paint residue Dd can be produced as a solid fuel, or can be produced as an aggregate for various kinds of coating and pavement. In other words, the coating residue D having high tackiness, which is difficult to handle, is dried and cured, and is formed into granules having a desired particle size to enhance the handling property. It can produce recycled products. In addition, it goes without saying that those skilled in the art can make various modifications without departing from the scope of the claims.

[0075]

As is apparent from the above description, claim 1
In the method for recycling paint slag of the invention according to the invention, the paint scum is heated and dried, hardened, and granulated, so that the paint slag that was conventionally only incinerated can be recycled, for example, as a substitute for coke. This has the effect that it can be reused as a raw material for steelmaking blast furnaces. Therefore, material recycling that can be reused and contributes to reducing the depletion of effective resources, which is desired by society, can be achieved without discarding paint scum only by thermal recycling. This has the effect.

According to the method for recycling paint slag according to the second aspect of the present invention, in addition to the effect of the method for recycling paint slag according to the first aspect, in addition to the conventional method, the paint scum is subdivided into a size that can be processed by human hands. By using a box-shaped container body having an open top and a collecting container having a partition plate for dividing the paint residue collected in the container body, the paint plate is subdivided by removing the partition plate from the container body. There is an effect that can be. Therefore, there is an effect that the work of dividing the paint residue, which has been complicated and heavy labor, can be extremely easily performed.

In the method for recycling paint slag according to the third aspect of the present invention, in addition to the effect of the method for recycling paint slag according to claim 1 or 2, it has not been conventionally used for treating paint slag. The use of the twin-screw kneader has the effect that the paint residue can be cured and granulated while drying. Therefore, there is an effect that the paint residue can be processed with simple equipment that is easy to maintain, and a plurality of steps of drying, curing, and granulating can be performed at once. Further, there is also an effect that a paint residue processed under desired conditions can be easily obtained only by changing the configuration, the number of revolutions, and the like of the twin-screw kneader.

According to the method for recycling paint slag of the invention according to claim 4, in addition to the effect of the method for recycling paint slag according to claim 3, the paint scum fragmented in the third step is removed by a screw extruder. Stable quality can be obtained by supplying a fixed amount to the shaft screw kneader, and the filling rate of the twin screw kneader can be increased to produce the most efficient production.

According to the method for recycling paint slag of the invention according to claim 5, in addition to the effect of the method for recycling paint slag according to any one of claims 1 to 4, the paint finely divided in the third step is obtained. The slag is conveyed by a conveying means having a metal detector arranged at a predetermined position, and when the metal detector detects metal foreign matter mixed in the paint scum, the portion containing the foreign matter of the paint scum is discarded. Since it is discarded by the means, there is an effect that the quality can be improved without containing foreign matter in the produced recycled product of the paint residue. Further, there is also an effect that an accident caused by foreign matter mixing in the fourth step of heating, drying, hardening, and granulating the paint residue can be eliminated.

According to the method for recycling paint slag of the invention according to claim 6, in addition to the effect of the method for recycling paint slag according to any one of claims 1 to 5, paint slag produced as a recycle product is The diameter is 0.1mm or more, 8mm
By forming the particles into the following granules, for example, it is easy to use as a raw material for a steelmaking blast furnace as a substitute for coke, and there is an effect that material recycling can be achieved.

According to a seventh aspect of the present invention, there is provided a container for collecting paint scum used in the method for recycling paint scum, wherein a partition plate for dividing the paint scum collected in the container body is detachable from the container body. Since the inner surface of the main body and the surface of the partition plate are coated to enhance the releasability from the highly adhesive paint residue, the paint residue contained in the container body is partitioned by the partition plate in advance, and the partition plate is separated from the paint residue. Can be easily pulled out, so that there is an effect that the paint residue can be easily divided.

In the steelmaking blast furnace raw material manufactured from the paint slag of the invention according to the eighth aspect, the volatile component is 10% or less, and the shape thereof is formed in a granular shape having a diameter of 0.1 mm or more and 8 mm or less. There is an effect that desired performance can be exhibited as a substitute for coke in a blast furnace.

[Brief description of the drawings]

FIG. 1 is a diagram showing a pretreatment step in a method for recycling paint residue D according to the present embodiment.

FIG. 2 is a diagram illustrating in detail a coating booth 2 used for pretreatment in a method for recycling paint slag D according to the present embodiment.

FIG. 3 is a view showing a post-treatment step in a method for recycling paint slag D of the present embodiment.

FIG. 4 is a plan view of the pallet 5;

FIG. 5 is a side view of the pallet 5 viewed from a direction A in FIG.

FIG. 6 is a side view of the pallet 5 as viewed from a direction B in FIG.

FIG. 7 is an exploded view of the pallet 5 shown in FIG.

8 is a perspective view of the pallet 5 containing the paint residue D,
It is sectional drawing in a part.

FIG. 9 is a schematic diagram illustrating the deodorizing device 10 in detail.

FIG. 10 is a schematic diagram showing an internal configuration of a twin-screw kneader 8;

FIG. 11 is a diagram showing steps of a modification of the recycling method of the present embodiment.

FIG. 12 is a view showing a procedure of a conventional method for collecting and treating paint residue.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Recycling apparatus, 2 ... Painting booth, 3 ... Paint collection pond, 4 ... Bucket, 5 ... Pallet, 51 ... Container body, 5
1a: flange portion, 51b: mesh plate support portion, 52: partition plate, 521a to d: plate member, 522a to e: plate member, 53a to d: fork hook portion, 54: mesh plate, 5
5a-d ... hook part, 56a, b ... leg part, 57a, b ...
Drain outlet, 58: Drainage chamber, 6: Screw extruder, 7: Metallic foreign matter detection device, 8: Twin screw kneader, 81: Main body,
82 motor, 83 gear box, 84 hopper, 8
Reference numeral 5: barrel, 85a: feed barrel, 85b: closed barrel, 85c: vent barrel, 85d: dewatering barrel, 86: screw, 87: kneading disc, 8
7a: forward kneading disc, 87b: orthogonal kneading disc, 89: heater, 90: shaft, 9: continuous slag cooling device, 10: deodorizing device, WK: work, WT ...
Water for collection, D: paint residue, Ds: sediment paint residue, Df: floating paint residue, Dd: dry paint residue

Continuation of the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) C21B 5/00 302 C21B 5/00 302 4K012 320 320 (72) Inventor Hironao Ohtake 100 Kanayama, Ichiriyama-cho, Kariya-shi, Aichi Prefecture Inside Toyota Shatai Co., Ltd. (72) Takao Goto, Inventor 100, Kanayama, Ichiriyama-cho, Kariya City, Aichi Prefecture Inside Toyota Shatai Co., Ltd. (72) Inventor, Fuminari 100, Kanayama, Ichiriyama-cho, Kariya City, Aichi Prefecture Toyota Shatai Stock Inside the company (72) Inventor Takashi Ota 41-Cho, Yokomichi, Nagakute-cho, Aichi-gun, Aichi Prefecture Inside Toyota Central Research Laboratories Co., Ltd. (72) Inventor Norio Sato 41-Cho, Ochimichi, Nagakute-cho, Aichi-gun, Aichi Prefecture (1) Inside Toyota Central Research Institute Co., Ltd. (72) Inventor Kenzo Fukumori 41-cho, Chuchu-Yokomichi, Nagakute-cho, Aichi-gun, Aichi Prefecture No. 1 Inside Toyota Central Research Laboratories Co., Ltd. (72) Inventor Tatsuta Tatsuta, Aichi-gun, Aichi County 1 share at 41 Changchun Yokomichi F-term in Toyota Central R & D Laboratories Co., Ltd.

Claims (8)

[Claims] 1. A first step of collecting paint scum that has not been applied to an object to be coated with a paint containing a thermosetting resin, and a predetermined container for collecting the paint scum collected in the first step. A second step of collecting the paint residue collected in the collection container in the second step; a third step of heating the paint residue separated in the third step; Drying, curing, and granulating. 4. A method for recycling paint slag. 2. The method according to claim 1, wherein the third step includes the step of: separating the partition plate of the collection container including a box-shaped container body having an open top and a partition plate for dividing the paint residue collected in the container body. The method for recycling paint scum according to claim 1, wherein the paint scum is subdivided by removing the paint scum from the container body. 3. The recycling of the paint slag according to claim 1, wherein the fourth step comprises curing and granulating the paint scum while drying it with a twin-screw kneader. Method. 4. The method for recycling paint slag according to claim 3, wherein the paint scum fragmented in the third step is quantitatively supplied to the twin-screw kneader by a screw extruder. 5. The paint scum fragmented in the third step is transported by transport means having a metal detector arranged at a predetermined position, and the metal mixed into the paint scum by the metal detector. 5. The method according to claim 1, further comprising a step of discarding a portion of the paint slag containing the foreign material by a discarding means when a foreign material is detected. Method. 6. The paint scum according to claim 1, wherein the paint scum is formed into a particle having a diameter of 0.1 mm or more and 8 mm or less in the fourth step. Recycling method. 7. An inner surface of the container main body and the partition plate, comprising: a box-shaped container main body having an open upper portion and a net plate at a bottom portion; and a partition plate for dividing the paint residue collected in the container main body. 3. The recycling of paint scum according to claim 2, wherein a surface of the slime is coated to enhance the releasability from the paint scum, and the partition plate is configured to be removable from the container body. Container for collecting paint residue used in the method. 8. A paint according to claim 1, wherein the paint has a volatile component content of 10% or less and a shape of 0.1 to 8 mm in diameter. Blast furnace raw material manufactured from slag.