JPH05109060A - Method and device for processing magnetic tape - Google Patents

Abstract

PURPOSE:To provide a method and device for processing a magnetic tape for releasing a support body and a magnetic layer of a disposed magnetic tape and collecting the support body efficiently and separately. CONSTITUTION:A disposed magnetic tape which is cut into small pieces is agitated within a medical fluid within a medical fluid bath 2 for releasing a magnetic powder A from a support piece T and at the same time a clean medical fluid where the above magnetic powder A is eliminated from the medical fluid which is extracted by filtering and separating the above support piece T within the above medical fluid bath 2 is subjected to filtering reflex into the above medical fluid bath 2. The medical fluid within the above medical fluid bath 2 is agitated so that the above magnetic powder A settles and at the same time the above support piece T is washed so that the medical fluid within the above medical fluid bath 2 flows in piston.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic tape processing method suitable for use in recovering waste magnetic tape materials, and a processing apparatus for carrying out this method. The present invention relates to a processing method and a processing device for separating and recovering a body part.

[0002]

2. Description of the Related Art In recent years, magnetic tapes such as audio tapes and video tapes have been produced in large quantities, but the amount of waste magnetic tapes such as rejected products and used discarded products in the manufacturing process has also increased. There is. Conventionally, such a waste magnetic tape has been discarded by a method such as landfill or incineration, but the magnetic tape is one in which a magnetic layer is formed on a support made of synthetic resin. When discarded in soil, the support is difficult to decompose, and the magnetic layer contains a harmful substance, which is not preferable from the viewpoint of preventing pollution. Further, even when these waste magnetic tapes are incinerated, there is a problem that toxic gas is generated, and their effective use is desired from the standpoint of recycling resources as well as environmental protection problems.

Therefore, as a method of collecting these waste magnetic tapes, the waste magnetic tapes cut into small pieces are immersed in a chemical solution such as an alkaline aqueous solution and stirred at a high speed to separate the support piece from the magnetic layer, and the support. A method in which body pieces are washed with water, dehydrated and dried to be separated and collected is disclosed in JP-A-53-70404 and JP-A-5-40440.
8-166016, 59-52433 and 59
-91028 gazette etc. are disclosed.

[0004]

However, when the magnetic layer is peeled from the support piece of the waste magnetic tape, and only the support piece is separated and recovered, the magnetic powder of the magnetic layer is peeled off and becomes fine. Adheres to the support piece and becomes difficult to separate. For this reason, conventionally, the support pieces to which the magnetic powder is attached are repeatedly washed in batches to be separated, but for cleaning, they are repeatedly washed several tens of times or washed all day. Without it, it could not be completely separated.

That is, an object of the present invention is to solve the above problems, and to treat a magnetic tape for easily separating the support of the waste magnetic tape from the magnetic layer and separating and recovering the support efficiently. A method and a processing device are provided.

[0006]

The above object of the present invention is to stir a waste magnetic tape cut into small pieces in a chemical solution in a chemical solution tank to separate magnetic powder from a support piece, and at the same time, in the chemical solution tank. In the peeling step of filtering and refluxing a cleaning chemical solution in which the magnetic powder is further removed from the chemical solution extracted by filtering and separating the support piece, the support piece floats,
And a washing step of stirring the chemical solution in the chemical solution tank so that the magnetic powder settles, and cleaning the support piece so that the chemical solution in the chemical solution tank becomes a piston flow. It is achieved by the magnetic tape processing method.

Further, the above object of the present invention is to provide a first rotary blade for separating magnetic powder from a support piece by agitating a waste magnetic tape cut into small pieces in a chemical solution in a chemical solution tank and the support piece. And a second stirring blade for stirring the chemical solution in the chemical solution tank so that the magnetic powder settles, and a support piece for separating the support piece by filtration in the chemical solution tank. A filtering means, a magnetic powder removing means for further removing the magnetic powder from the chemical solution in which the support piece is separated by filtration, and a cleaning chemical solution in which the magnetic powder is removed so that the chemical solution in the chemical solution tank forms a piston flow. A magnetic tape processing device characterized by having a circulation means for filtering and refluxing in the chemical liquid tank, or a waste magnetic tape cut into small pieces is stirred in the chemical liquid in the chemical liquid tank to stir the magnetic powder on the support piece. The first rotor blade separated from the above An agitator provided with a second rotary blade that agitates the chemical solution in the chemical solution tank so that the carrier piece floats and the magnetic powder settles, and the support piece is separated by filtration in the chemical solution tank. The support piece filtering means and the cleaning solution in an amount larger than the extracted amount of the chemical solution extracted by separating the support piece by filtration so that the chemical solution in the chemical solution tank forms a piston flow are intermittently supplied to the chemical solution tank. And a supply means for supplying the magnetic tape to the magnetic tape.

[0008]

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. 1 and 2 are schematic diagrams showing the configuration of a magnetic tape processing apparatus 1 according to a first embodiment of the present invention. The magnetic tape processing apparatus 1 includes a chemical solution tank 2 for containing an alkaline aqueous solution as a chemical solution, a plurality of dissolver type rotary blades 4 for stirring and mixing waste magnetic tape immersed in the chemical solution tank 2 at high speed, and the chemical solution. Anchor type rotor 3 for stirring and mixing the whole of the tank 2, the chemical solution tank 2
It comprises a wire mesh 5 provided at the bottom of the inside for filtering and separating the support piece T, and a circulating pump 7 for supplying an alkaline aqueous solution to the filter 6 together with the magnetic powder A separated from the support piece T of the waste magnetic tape. Has been done.

The plurality of dissolver type rotary blades 4 are configured to be rotatable by a motor M1, and the anchor type rotary blades 3 are configured to be rotatable by a motor M2. A discharge port 8 is provided at the bottom of the chemical liquid tank 3, and the discharge port 8 and the circulation pump 7 and the filter 6 are connected to the pipe 1
Connected by two. The filter 6 removes the magnetic powder A from the alkaline aqueous solution supplied by the circulation pump 7, and cleans liquid (clean alkaline aqueous solution not containing the magnetic powder A) and dirty liquid (alkaline aqueous solution containing the magnetic powder A). ) Is separated, and the clean liquid is refluxed into the chemical liquid tank 2 through the pipe 13. In addition, makeup water is appropriately replenished in the chemical liquid tank 2 through a water supply pipe 11.

Next, the magnetic tape processing apparatus 1 as described above.
The method of processing a magnetic tape for separating and recovering the magnetic material part of the magnetic tape and its support part will be described in detail with reference to.
First, in the step of separating the magnetic material portion and its support member portion, the waste magnetic tape cut into small pieces is immersed in the alkaline aqueous solution in the chemical solution tank 2, and the dissolver type rotary blade 4 is rotated at a high speed of, for example, about 1500 rpm. By rotating and rotating the anchor type rotary blade 3 at, for example, about 30 rpm, the waste magnetic tape pieces are mixed at high speed.

Then, usually, after about 10 minutes, the magnetic powder A begins to peel from the waste magnetic tape piece, so that the support piece T and the magnetic powder A start to disperse in the alkaline liquid as shown in FIG. Therefore, when the circulation pump 7 is operated, the alkaline aqueous solution in the chemical liquid tank 2 is filtered by the filter 6
However, since the support piece T is separated by filtration by the wire net 5 provided at the bottom of the chemical solution tank 2, the wire net 5 is contained in the alkaline liquid extracted from the outlet 8. Only the magnetic powder A that has passed through and settled at the bottom of the chemical liquid tank 2 is dispersed.

Then, the alkaline aqueous solution in which the magnetic powder A is dispersed is sent to the filter 6 and separated into a clean liquid and a dirty liquid. The dirty liquid containing the magnetic powder A is discharged from the pipe 14, and the clean liquid from which the magnetic powder A is removed is passed through the pipe 13 to the chemical liquid tank 3
Is returned to. Incidentally, when 50 liter / min of the alkaline aqueous solution is supplied to the filter 6 by the circulation pump 7, the dirty liquid discharged from the pipe 14 is about 5 liter / min.
Clean liquid recirculated through the tank is 45 liters / min
It became about.

Further, in the cleaning step of the support pieces T after the magnetic powder A is peeled off from all the support pieces T, the dissolver type rotor blade 4 is stopped as shown in FIG. The anchor type rotor blade 3 is set to, for example, 10 r so that the body piece T floats and the magnetic powder A sinks.
The alkaline aqueous solution in the chemical solution tank 2 is agitated by rotationally driving to about pm.

Then, while continuing the supply of the alkaline aqueous solution to the filter 6 by the circulation pump 7,
By spraying and adding a clean liquid refluxed through the pipe 13 onto the surface of the alkaline solution in the chemical solution tank 2 in a shower shape, the alkaline solution in the chemical solution tank 2 is made to flow downward from the piston. .. Then, the support piece T
The magnetic powder A settles downward in a state of being suspended in an alkaline aqueous solution and is extracted together with the alkaline aqueous solution from the discharge port 8. Therefore, the magnetic powder A peeled and fined and the support piece T are efficiently removed. Well separated.

That is, according to the magnetic tape processing apparatus 1 of the above embodiment, the magnetic powder A can be separated and removed from the alkaline aqueous solution even during the peeling step of the support piece T and the magnetic powder A. In addition, since the magnetic powder A and the support piece T that have been peeled off can be efficiently separated even in the washing step, for example, in a conventional magnetic tape processing apparatus, it took about 10 hours (20 times washing). The separation and recovery process of the support pieces could be performed in about 3 hours. Further, since the magnetic tape processing apparatus 1 of the present embodiment cleans the support piece T while circulating the cleaning water, the conventional magnetic tape processing apparatus requires approximately 7,000 liters of cleaning water. Is about 900 liters of wash water.

Next, by using the magnetic tape processing apparatus 10 according to the second embodiment of the present invention shown in FIG. 3, a magnetic tape processing method for separating and recovering the magnetic material portion of the magnetic tape and the supporting material portion thereof. Will be described in detail. The same members as those of the magnetic tape processing apparatus 1 are designated by the same reference numerals and the description thereof will be omitted. First, in the step of separating the magnetic material portion and its support portion, by opening the valve 16 and closing the valve 17, the clean liquid separated by the filter 6 is placed in the chemical liquid tank 2 as in the first embodiment. By stirring and mixing the alkaline aqueous solution with the dissolver type rotor blade 4 and the anchor type rotor blade 3 while filtering and refluxing,
The stripping of the support piece T and the magnetic powder A and the separation and removal of the magnetic powder A from the alkaline aqueous solution are simultaneously performed.

Further, in the step of cleaning the support pieces T after the magnetic powder A is peeled off from all the support pieces T, the dissolver type rotor blades 4 are stopped and the support pieces T float. Further, the anchor type rotary blade 3 is rotationally driven at, for example, about 10 rpm so that the magnetic powder A settles to stir the alkaline aqueous solution in the chemical liquid tank 2, and the valve 16 is closed and the valve 17 is opened. As a result, the alkaline aqueous solution in the chemical liquid tank 2 is sent to the magnetic separator 21 by the circulation pump 7, and the filtration and reflux into the chemical liquid tank 2 is stopped. The alkaline aqueous solution sent from the pipe 15 is prevented from flowing back to the filter 6 by a check valve (not shown). The magnetic separator 21 is a storage tank 22 for temporarily storing a chemical liquid containing the magnetic powder A, a roller 23 having a built-in permanent magnet to rotate the magnetic powder A attached thereto, and a magnetic powder attached to the surface of the roller 23. A blade 24 for scraping A into the storage tank 25 and a pipe 26 for discharging the waste liquid from which the magnetic powder A has been removed are configured.

Then, when the alkaline aqueous solution in the chemical solution tank 2 reaches the bottom of the chemical solution tank, cleaning water is spray-added from the water supply pipe 11 in a shower shape. The supply amount of the cleaning water is set to be larger than the extraction amount of the alkaline aqueous solution sent to the magnetic separator 21, and the supply of the cleaning water is stopped when the liquid level reaches the upper part of the chemical bath. By intermittently supplying the cleaning water in this way, the cleaning of the support body T is repeated while replacing the cleaning water in the chemical solution tank to make the piston flow in the chemical solution tank, and the magnetic powder A and the support which have been peeled off. The piece T is continuously washed and separated.

That is, since the support piece T is suspended in the alkaline aqueous solution, and the magnetic powder A is settled downward, the alkaline aqueous solution in the chemical solution tank 2 is repeatedly discharged from the discharge port 8. A is efficiently discharged from the chemical liquid tank 2. Therefore, the magnetic powder A and the support piece T can be separated more reliably than in the magnetic tape processing apparatus 1 of the first embodiment.

The present invention is not limited to the treatment apparatus of each of the above embodiments, and, for example, an aqueous solution containing a surfactant or another chemical liquid such as an organic solvent may be used instead of the alkaline aqueous solution. Needless to say, the shape of the rotary blade, the wire mesh 5 as the support piece filtering means, the filter 6 as the magnetic powder removing means, the magnetic separator 21, the circulating means, the supplying means and the like can also take various forms.

[0021]

As described above, in the magnetic tape treating method and the treating apparatus of the present invention, the waste magnetic tape cut into small pieces is stirred in the chemical solution in the chemical solution tank to separate the magnetic powder from the support piece. A stripping step of filtering and circulating a cleaning chemical solution obtained by further removing the magnetic powder from the chemical solution extracted by filtering and separating the support piece in the chemical solution tank, the support piece floating, and And a washing step of stirring the chemical liquid in the chemical liquid tank so that the magnetic powder settles, and washing the support piece so that the chemical liquid in the chemical liquid tank becomes a piston flow.

That is, the magnetic powder can be separated and removed from the chemical solution even during the peeling process of the support piece and the magnetic powder, and the magnetic powder can be removed while the support piece is suspended in the chemical solution. Since the particles settle down and are extracted together with the chemical solution, the magnetic powder that has been peeled off and made fine in the washing step and the support piece T can be efficiently separated, and the processing time can be greatly shortened.

Therefore, it is possible to provide a magnetic tape processing method and a processing apparatus for easily separating the support of the waste magnetic tape from the magnetic layer and efficiently separating and recovering the support.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a magnetic tape processing device according to a first embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of a magnetic tape processing device according to a first embodiment of the present invention.

FIG. 3 is a schematic configuration diagram of a magnetic tape processing device according to a second embodiment of the present invention.

[Explanation of symbols]

 1 Magnetic Tape Processing Device 2 Chemical Solution Tank 3 Anchor Type Rotating Blade 4 Dissolver Type Rotating Blade 5 Wire Mesh 6 Filter 7 Circulation Pump 8 Ejection Port 10 Magnetic Tape Processing Device 11 Water Supply Pipe 12 Piping 13 Piping 14 Piping 15 Piping 16 Valve 17 Valve 21 Magnetic separator A Magnetic material T Support piece

Claims (3)

[Claims] 1. A waste magnetic tape cut into small pieces is stirred in a chemical solution in a chemical solution tank to separate the magnetic powder from the support piece, and the support piece is extracted by filtration in the chemical solution tank. A peeling step of filtering and refluxing a clean chemical solution in which the magnetic powder is further removed from the chemical solution into the chemical solution tank, and stirring the chemical solution in the chemical solution tank so that the support piece floats and the magnetic powder precipitates. And a cleaning step of cleaning the support piece so that the chemical solution in the chemical solution tank flows like a piston. 2. A first rotor blade for separating magnetic powder from a support piece by agitating a waste magnetic tape cut into small pieces in a chemical solution in a chemical solution tank and the support piece, and the magnetic powder. Second, the chemical solution in the chemical solution tank is agitated so as to settle.
A stirrer equipped with a rotary blade, a support piece filtering means for filtering and separating the support piece in the chemical solution tank, and a magnetic powder for further removing the magnetic powder from the chemical solution in which the support piece is filtered and separated. A magnetic tape processing apparatus comprising: a removing means and a circulating means for filtering and circulating the cleaning chemical solution from which the magnetic powder has been removed so that the chemical solution in the chemical solution tank forms a piston flow. 3. A first rotor for separating magnetic powder from a support piece by agitating a waste magnetic tape cut into small pieces in a chemical solution in a chemical solution tank and the support piece floating, and the magnetic powder. Second, the chemical solution in the chemical solution tank is agitated so as to settle.
An agitator having a rotary blade, a support piece filtering means for filtering and separating the support piece in the chemical solution tank, and the support piece for filtering and separating so that the chemical solution in the chemical solution tank forms a piston flow. And a supply means for intermittently supplying an amount of cleaning water larger than the extracted amount of the chemical liquid extracted into the chemical liquid tank.