CN1284637C - Recycling Methods of Discarded Discs - Google Patents

Abstract

The method for recovering the waste optical disk comprises a step of crushing the optical disk, a step of cold-hot interactive impact treatment, a step of adding a solution and a step of separating and recovering. Wherein, the step of crushing the optical disk is to crush the optical disk mechanically; cold and hot interactive impact treatment, namely, the crushed optical disk is subjected to cold impact and hot impact alternately; adding a solution to separate the components of the optical disk due to different specific gravities; and a separation and recovery step, namely respectively recovering the components of the optical disk in the solution.

Description

Recycling Methods of Discarded Discs

technical field

The invention relates to a method for recycling waste optical disks, in particular to a method for recycling waste optical disks with cold and heat alternating impact treatment.

Background technique

Optical Compact Discs (CD), due to its large capacity, stable picture and sound quality, and long-term preservation, has gradually replaced magnetic tapes for audio and video tapes, and has become a very common recording medium. According to different recording principles, optical recording media are divided into read-only discs (CD-ROM), recordable (only write-once) discs (CD-R), and re-readable discs (CD-ROM). RW).

In recent years, optical discs have become the darling of recording media due to their advantages of low price, fast burning speed, easy portability and high compatibility with personal computers (PCs). Due to the circulation of a large amount of information, optical recording media with higher storage density, smaller volume, and lower production cost are required. High-density optical recording media, such as DVD (Digital Video Disc) and HD-DVD (High-Density DVD), is the main goal of research and development.

As shown in Figure 1, the main structure of a CD-R/RW disc is a substrate 11, a recording layer 12, a metal reflection layer 13 (Metal Reflection Layer) and a protective layer 14 (ProtectiveLayer). The biggest difference from the CD-ROM is that the main purpose of the CD-R/RW disc is to provide a CD recorder to record data, so there is one more layer in the disc structure than the CD-ROM. The recording layer 12 is composed of organic dyes, and the materials include Ge-Sb-Te, Ag-In-Te-Sb and other metals. The difference in the material of the organic dyes can form discs of different colors, such as gold, blue and green discs. wait. The structure of DVD discs is roughly the same. There is a dielectric layer that almost does not absorb light at all above and below the recording layer, and a metal reflective film above it, and a polymer protective layer is coated on the top. Finally, a substrate is attached to form a single-sided recorded DVD disc.

In optical discs, the most commonly used materials for the substrate 11 are polycarbonate (PC) and acrylic (PMMA), which are characterized by low cost and low manufacturing and injection costs. Among them, polycarbonate (PC) has a higher unit price and is often the target of recycling.

The material of the metal reflective layer 13 includes aluminum alloy, gold, silver, etc., and the metal sheet is pressed by a mold, so the top is full of many small pits. Recordings are formed due to reflection differences caused by potholes. The protective layer generally uses UV glue as the material of the protective layer, in order to prevent corrosion of the metal reflective layer 13 and to avoid infiltration of water vapor.

Although the optical disc can be stored for a very long time, it is undeniable that if the metal layer is slightly scratched, its memory area will be destroyed, resulting in data loss and incompleteness. Therefore, usually scratched discs are unusable and need to be discarded. On the other hand, factories that manufacture optical discs also screen out many defective optical discs due to quality control, and must also be discarded.

At present, most of the ways to deal with waste optical discs are to crush the optical discs and discard them directly, but in this way, the metals in the optical discs will not only pollute the soil and water sources, but also make the available recycled substances in the optical discs (such as precious metals and plastics), waste nothing.

Therefore, in today's era that emphasizes the reduction of environmental pollution and resource recovery, how to recycle waste optical discs, retrieve available resources for reuse, and reduce the amount of waste at the same time is a very worthwhile consideration for the industry. question.

In view of the above problems, the inventor proposes a recycling method for waste optical discs that can solve the problems of pollution and waste of resources caused by direct discarding of waste optical discs.

Contents of the invention

As mentioned above, the object of the present invention is to provide a method for recycling waste optical discs that avoids direct discarding of optical discs, which would cause environmental pollution and waste of resources.

In order to achieve the above purpose, according to the recycling method of waste optical discs of the present invention, it includes a step of pulverizing optical discs, a step of alternating cold and heat impact treatment, a step of adding solution, and a step of separation and recovery. Among them, the step of crushing the optical disc is to mechanically crush an optical disc; the step of alternating cold and heat shock treatment is to alternately perform cold shock and thermal shock on the crushed optical disc; the step of adding a solution is to add a solution to make the optical disc The plastics and metals in the solution are separated due to different specific gravity; the separation and recovery step is to recover the plastics and metals of the optical disk in the solution respectively.

Therefore, the recycling method for waste optical discs according to the present invention is especially a recycling method for waste optical discs with alternating cold and heat impact treatment. It can cause the optical disc to peel off between the metal layer and the plastic layer after the cold and heat alternating shock treatment steps. Then use the solution whose specific gravity is between metal and plastic to accelerate the separation of the two, so as to facilitate the subsequent separation and recovery steps. Therefore, the available resources in the optical disc can be recovered and reused, the waste of resources can be avoided, and the amount of waste can be reduced, thereby achieving environmental protection.

Description of drawings

Fig. 1 is the main structure schematic diagram of known CD-R/RW disc;

Fig. 2 is the flow chart of the waste optical disc recycling method of the present invention;

FIG. 3 is a flow chart of another method for recovering waste optical discs of the present invention.

Detailed ways

The method for recovering waste optical discs according to a preferred embodiment of the present invention will be described below with reference to related drawings.

As shown in FIG. 2 , the method for recovering waste optical discs of the present invention includes a step S10 of crushing optical discs, a step S20 of alternating cold and heat impact treatment, a step S30 of adding a solution, and a step S40 of separation and recovery. Among them, the step S10 of crushing an optical disc is to crush an optical disc mechanically; the step S20 of alternating cold and heat impact treatment is to alternately perform cold shock and thermal shock on the crushed optical disc; the step S30 of adding a solution is to add a solution The components of the optical disk are separated due to the difference in specific gravity; the separation and recovery step S40 is to separately recover the components of the optical disk in the solution.

The recycling method of waste optical discs of the present invention, wherein optical discs refer to read-only optical discs (CD-ROM), recordable optical discs (CD-R), re-readable optical discs (CD-RW) and/or Or Digital Video Disc (DVD).

In the step S10 of crushing the optical disc, the optical disc is crushed mechanically, and the machine can be a jaw crusher (JAW CRUSHER), a pulverizer, a grinder, and a crushing machine, and of course other machines that can crush the optical disc can also be used. other devices. The fragmented disc has a larger contact area with the outside world, which is convenient for subsequent steps.

In a preferred embodiment of the present invention, the step S20 of alternating cooling and heating shock treatment is to alternately perform cold shock and thermal shock on the pulverized optical disc. This step is carried out in a closed and dry space (relative humidity 40%), and the alternating impact of cold and heat is carried out to avoid the interference of water vapor condensation. Wherein, the cold shock treatment may adopt dry cooling treatment, for example, use cheap liquid nitrogen with a low boiling point (-195° C.) to perform dry cooling treatment for 10 minutes. Immediately after the cold shock treatment, heat shock treatment can be carried out by using dry hot steam at 80°C for 10 minutes. Then followed by another cold shock treatment, and the amount of cold and hot shock treatment of the visible optical disc, as well as the actual operation situation, were repeated more than three times. After the cold and heat alternating impact treatment step S20 , on the crushed optical disc, due to the different thermal expansion coefficients of different materials, peeling occurs, so that the metal layer and the plastic layer are separated.

Next, in the step S30 of adding a solution, a solution is added to separate the components of the optical disc due to different specific gravity. Wherein, the specific gravity of the solution is between the metal and the plastic, for example, the specific gravity is 1.1-1.3, which can rapidly delaminate the metal (the specific gravity is mostly greater than 4) and the plastic (the specific gravity is mostly smaller than 1).

As shown in Figure 3, the method for recovering waste optical discs in a preferred embodiment of the present invention can further include a step of standing still after slow stirring S31, so that the optical discs that have passed through the steps of alternating cold and heat impact can be added with a specific gravity of 1.1- After the solution of 1.3, the steps of stirring and standing are used to accelerate the stratification of metal and plastic in the solution, so as to save the time of the recycling process.

Please refer to FIG. 3 again. Finally, the separation and recovery step S40 is to recover the components of the optical disc in the solution. Wherein, the separation and recovery step further includes a layered filtration step S41. After the metal and plastic components in the optical disk are layered in the solution, the substances contained in the upper and lower layers can be filtered out respectively. In the upper solution, the plastic can be filtered out; in the lower solution, the metal can be filtered out. Thereafter, the plastic metal purification step can be carried out separately if desired. For example, the metal can be adsorbed on the negative electrode of the electrolytic cell by electrolysis, and then the metal adsorbed in the negative electrode is concentrated and melted into a block to obtain a high-purity metal component; After drying and drying, it can be granulated into granular plastic raw materials.

To sum up, the method for recovering waste optical discs of the present invention can cause peeling between the metal layer and the plastic layer after the crushed optical discs undergo the cold and heat alternating shock treatment steps. Then use the solution whose specific gravity is between metal and plastic to accelerate the separation of the two in the solution, so as to facilitate the subsequent separation and recovery steps. Therefore, the available resources in the optical disc can be recovered and reused, the waste of resources can be avoided, and the amount of waste can be reduced, thereby achieving environmental protection.

The above descriptions are illustrative only, not restrictive. Any equivalent modifications or changes made without departing from the spirit and scope of the present invention shall be included in the scope of the appended claims.

Claims (8)

1. useless CD sheet recovery method comprises in regular turn:

Pulverizing the step 1 of CD sheet, is that a CD sheet is mechanically pulverized;

The step 2 of cold and hot mutual shock treatment is with this CD sheet after pulverizing, and carries out cold shock and thermal shock alternately;

The step 3 that adds solution is to add a solution plastics of this CD sheet are separated because of proportion is different with metal; And

Separating the step 4 that reclaims, is CD sheet plastics and the metal that reclaims respectively in this solution.

2. useless CD sheet recovery method according to claim 1 is characterized in that being provided with one and leaves standstill step after stirring at a slow speed between the step that adds solution and the step of separating recovery.

3. useless CD sheet recovery method according to claim 1 is characterized in that this CD sheet is meant CD-ROM sheet CD-ROM, recordable disc sheet CD-R, rewritable type CD sheet CD-RW and/or Video CD sheet DVD.

4. useless CD sheet recovery method according to claim 1 is characterized in that this pulverizing CD sheet step, is to utilize a jaw crusher, a pulverizer, a grater or towards broken machine, to carry out this pulverising step.

5. useless CD sheet recovery method according to claim 1 is characterized in that the cold treatment in this thermal shock processing is to adopt dry and cold processing.

6. useless CD sheet recovery method according to claim 1 is characterized in that the heat treatment in this thermal shock processing is to adopt dry heat treatment.

7. useless CD sheet recovery method according to claim 1, the proportion that it is characterized in that this solution is between 1.1～1.3.

8. useless CD sheet recovery method according to claim 1 is characterized in that this separation recovery further comprises a layered filtration step.

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