CN102416400A - Waste optical disk processing device - Google Patents

Abstract

A device for processing waste optical discs. The bottom end of the first solution tank is connected to the first peristaltic pump through a conduit, and the first peristaltic pump is connected to the upper end of the reaction tank through the tube. A polytetrafluoroethylene rod is placed horizontally in the reaction tank. The diameter of the vinyl fluoride rod coincides with the aperture of the disc, one end of the polytetrafluoroethylene rod extends out of the reaction tank to connect to the motor, the bottom end of the side wall of the reaction tank is connected to the second peristaltic pump, and the second peristaltic pump is connected to the second solution tank. The technical effects of the present invention are: (1) The application of chemical production method does not simply crush and granulate waste optical discs, but carries out further processing in layers, so that the obtained polycarbonate coarse material is more pure and easy to finely process. (2) The chemical eluent is used to treat the surface layer and reflective layer of the disc, and the precious metals in the waste liquid can be recovered, and the organic solvent is dissolved-reverse precipitation to purify polycarbonate.

Description

Waste disc processing device

technical field

The present invention relates to a device for processing waste articles, in particular to a device for processing waste optical discs.

Background technique

For waste optical discs, my country's current treatment is mainly crushing and burning. The optical discs contain organic dyes, inks, aluminum, copper alloys, polycarbonate plastics and other components. Toxic substances such as metals and organic substances contained in optical discs still exist, which not only wastes a lot of precious resources, but also causes serious pollution.

When CDs are incinerated, during the process of thermal decomposition, the CDs will be cracked, releasing a large amount of harmful gases and even producing carcinogens such as dioxins. During the incineration process, the inorganic metals in the dye layer will also be volatilized in the atmosphere, causing air pollution.

The landfill disposal method also has many problems. First, it encroaches on the limited cultivated land and seriously wastes the land resources. Secondly, after the CD is buried, it will not rot for a long time, which will harm the future. It is difficult for microorganisms to decompose organic matter. It takes more than 100 years for the polycarbonate in the CD to be completely decomposed in the landfill; Human living environment, causing harm to future generations. A1 ³⁺ will affect the absorption of nutrients by plant roots, and heavy metal ions will cause heavy pollution. Although the metal on the CD only accounts for about 0.8% of the total weight and its thickness is only a few microns, the contact area between the heavy metal per unit weight and the soil is very large, which is equivalent to the surface area of 1.5 million tons of 5mm thick metal plates. Therefore, although the metal content in the CD is small, its pollution rate is quite high; in the end, the CD will cause damage to the soil, degrade the cultivated land, hinder the development of plant roots and the absorption of water and nutrients, and poison the soil.

In China, waste discs are re-granulated and utilized. For example, Shenzhen Xinsheng Zanji Company is currently the only enterprise that produces recycled polycarbonate on a large scale in my country. It uses the traditional simple regeneration method to crush, wash, dry, and Several steps such as extrusion and granulation are carried out for melt granulation. At present, the simple regeneration method is mainly used in the recovery of optical disk base disks, and wastes of different grades will be generated during the manufacturing process of optical disks. Although the simple regeneration technology saves investment and has low processing costs, the resulting products have low technical content, are difficult to guarantee quality, and are likely to cause secondary pollution.

A recent survey by the German Ministry of the Environment shows that only 5,000 tons of optical discs are collected and recycled in Germany, which uses a huge amount of optical discs. Optical discs are high-quality plastics that can be used as raw materials to produce medical devices, Automobiles and computers, which can save a lot of raw material oil. The German Ministry of the Environment established a CD recycling system throughout Germany in June 1997, and there is an official website from which people can learn information to discard CDs to designated locations; Japan’s Sony Corporation disposes of used CDs into high-grade waste, and then through a special process, and then crush the waste to re-make the PC base.

Contents of the invention

The object of the present invention is to provide a waste optical disk processing device, which has a high degree of integration, is easy to operate, can realize continuous production, and is also convenient for waste liquid collection and treatment.

The present invention is realized in this way, it comprises the first solution tank, the first peristaltic pump, reaction tank, disc group, motor, the second peristaltic pump, the second solution tank, polytetrafluoroethylene rod, it is characterized in that the first solution tank The bottom end of the tube is connected to the first peristaltic pump, and the first peristaltic pump is connected to the upper end of the reaction tank through the tube. A polytetrafluoroethylene rod is placed horizontally in the reaction tank. The diameter of the polytetrafluoroethylene rod matches the aperture of the optical disc. One end of the polytetrafluoroethylene rod extends out of the reaction tank to connect to the motor, the bottom end of the side wall of the reaction tank is connected to the second peristaltic pump, and the second peristaltic pump is connected to the second solution tank.

Waste discs are connected in series on a PTFE rod (the discs are evenly spaced). The diameter of the rod matches the diameter of the disc hole. The end of the rod passes through the outer wall of the glass and connects with the motor. Driven by the motor, The disc can rotate at a certain speed to keep the disc in contact with the reaction solution. The disc group is partly submerged in the reaction tank, which contains chemical eluent or organic solvent (change the type of reaction solution according to the reaction requirements), and the reaction solution flows into the reaction tank at a constant speed from the outlet of the first solution tank driven by the first peristaltic pump The inlet is slowly pushed towards the outlet by the rotation of the disc in the reaction tank, and then flows out from the outlet of the reaction tank driven by the second peristaltic pump and enters the second solution tank.

The first solution tank holds the freshly prepared reaction solution, and the second solution tank holds the reaction waste liquid, so that no cross-contamination occurs. When changing the liquid phase, the first solution tank is filled with clean water, and the water flows into the reaction tank by means of the peristaltic pump, and then enters the second solution tank, which can play the role of cleaning the solution tank and the reaction tank. The cleaning waste water is mixed with the reaction waste liquid, because it contains acid and alkali substances and organic solvent residue, which will have a certain pollution effect on the environment and must be collected and disposed of.

The technical effects of the present invention are: (1) The application of chemical production method does not simply crush and granulate waste optical discs, but carries out further processing in layers, so that the obtained polycarbonate coarse material is more pure and easy to finely process. (2) Chemical eluent disc treatment surface layer and reflective layer, precious metals can be recovered in waste liquid, organic solvent dissolution-reverse precipitation purification polycarbonate, this device uses whole waste discs as raw materials, no need to crush.

Description of drawings

Fig. 1 is a structural schematic diagram of the present invention.

In the figure, 1, the first solution tank 2, the first peristaltic pump 3, the reaction tank 4, the disc group 5, the motor 6, the second peristaltic pump 7, the second solution tank 8, the polytetrafluoroethylene rod.

Detailed ways

As shown in Figure 1, it is a waste disc processing device, which imitates the structure of a biological turntable. The motor 5 drives the polytetrafluoroethylene rod 8 inserted with the disc group 4 to rotate, and the speed is adjustable. The solution in the first solution tank 1 is pumped into the reaction tank 3 by the first peristaltic pump 2, and printing can occur in the reaction tank 3. Layer, protective layer detachment, reflective layer metal dissolution, dye layer peeling, polycarbonate dissolution and other reactions, the solution after the reaction is pumped into the second solution tank 7 by the second peristaltic pump 6 for processing.

The first solution tank 1 is connected to the first peristaltic pump 2, and the second peristaltic pump 6 is connected to the second solution tank 7. There are valves to control the inflow and outflow of the solution, which can be operated continuously or intermittently. The outlet of the first peristaltic pump 2 is inserted below the surface of the reaction liquid, and the reaction liquid immerses more than 60% of the area of the optical disk.

Examples are:

1. Classification: Classify according to the type of CD, and divide it into three types: CD-R (CD-ROM), CD-ROM (CD-ROM), and CD-RW (CD-RW).

2. Film removal: According to the type of metal in the reflective layer of the optical disc, put the used optical disc into the PTFE rod, put different types of chemical eluents into the first slot (there are generally two types of chemical eluents, the Sodium salt-based basic salt and inorganic acid-based acid solution, the concentration of about 20% can achieve a better removal effect), at 1:10 (CD (g): chemical eluent (mL)) , 60-80°C, motor speed 300r/min (disc edge speed about 1.88m/s) for 30-40min, the protective layer, printing layer, reflective layer and dye layer on the surface of the disc can be completely dissolved, and the color of the eluent The surface color is the same as that of the original disc, and it contains very fine suspended particles, so it is relatively turbid. The remaining disc is a polycarbonate base disc with a small amount of impurities, and it still maintains the shape of the disc. CD-ROM and CD-RW, two kinds of optical disks with aluminum as the reflective layer, can recover aluminum salt after forming aluminum chloride solution or sodium metaaluminate solution in the waste chemical eluent, and those with gold and silver as the reflective layer The CD can form a solution containing gold and silver to recover gold and silver.

(3) Polycarbonate recovery: add clear water to the first solution tank, clean the solution tank and reaction tank, and merge the cleaning wastewater into the chemical eluent waste liquid for treatment. Add 1,2-dichloroethane into the first solution tank (the solid-to-liquid ratio is still 1:10), and the polycarbonate substrate slowly swells to form a deformed sheet with a relatively low density, and then slowly separates into small pieces. until completely dissolved. After 2 hours, the polycarbonate is completely dissolved, and a small amount of insoluble impurities are mixed in the solution. Turn on the second peristaltic pump to pump out the solution, filter, and remove the insoluble filter residue (mainly the metal in the recording layer, the insoluble matter such as the printing layer), and the filtrate returns to In the first solution tank, add an equal volume of ethanol at the same time, and the polycarbonate can be precipitated rapidly under the action of ethanol to form extremely small suspended particles, which can be completely precipitated after 1 hour. Turn on the second peristaltic pump to pump out the solution, filter it, and recover the pure polycarbonate product, and the recovery rate can reach more than 90%. The obtained polycarbonate powder is granulated after adding antioxidants, plasticizers, etc., and then becomes a product.

Claims (1)

1. A waste optical disc processing device, which comprises a first solution tank, a first peristaltic pump, a reaction tank, a disc group, a motor, a second peristaltic pump, a second solution tank, and a polytetrafluoroethylene rod, and is characterized in that the first The bottom of the solution tank is connected to the first peristaltic pump through a catheter, and the first peristaltic pump is connected to the upper end of the reaction tank through a catheter. A polytetrafluoroethylene rod is placed horizontally in the reaction tank. The diameter of the polytetrafluoroethylene rod is the same as the aperture of the optical disc Matching, one end of the polytetrafluoroethylene rod extends out of the reaction tank to connect to the motor, the bottom end of the side wall of the reaction tank is connected to the second peristaltic pump, and the second peristaltic pump is connected to the second solution tank.

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