JP4469267B2 - Fluorescent tube glass purification method - Google Patents

Description

The present invention relates to how to clean the glass to remove the fluorescent film made of a fluorescent material or the like which is coated on the glass tube surface of the fluorescent tube.

  Currently, fluorescent tubes (fluorescent discharge tubes) that are widely used as efficient illumination lamps belong to low-pressure mercury lamps. In this fluorescent tube, a fluorescent substance is applied to the inner surface of a cylindrical glass tube, a tungsten double filament electrode formed with a protective film such as barium oxide on the surface is attached to both ends of the cylindrical glass tube, and the inside of the glass tube is evacuated. After depressurizing, a small amount of mercury and argon gas are sealed. Then, by energizing the electrodes at both ends and applying a voltage between the two electrodes and discharging in the glass tube, far ultraviolet rays are emitted from the mercury gas in the tube, and the far ultraviolet rays are applied to the fluorescent material applied to the inner surface of the glass tube. Irradiates and emits light.

  The glass used for the glass tube of the fluorescent tube is of high quality and can be reused as a high-quality glass if it is recycled. Therefore, if glass is recovered from a large amount of used waste fluorescent tubes, not only resources and energy can be saved, but also the amount of waste can be greatly reduced.

  However, as described above, the fluorescent material is applied to the inner surface of the glass tube, and the fluorescent material is adhering to the enclosed mercury although it is a trace amount. The glass tube cannot be recycled if these are applied and adhered. In addition, although the amount is very small, mercury is sealed in the fluorescent tube. When a large amount of waste fluorescent tube is crushed, a large amount of mercury is released, which harms the environment. Therefore, when recycling the waste fluorescent tube, it is necessary to remove and collect not only the fluorescent material but also mercury.

  Therefore, a recycling process for removing and collecting the fluorescent film and mercury has been conventionally performed by various methods, and they are roughly classified into a wet method and a dry method. However, the wet method is a method of cleaning and removing the fluorescent film using a cleaning liquid, and is not efficient because the treatment of the waste liquid containing the fluorescent substance separated from the glass and mercury is very complicated. Recently, dry methods have been widely used.

As a dry method, a method has been proposed in which both ends of a fluorescent tube are cut to separate the glass tube portion and the electrode portion, and then the fluorescent film is peeled and removed by spraying an abrasive with compressed air inside the glass tube portion. (For example, refer to Patent Document 1). Further, both ends of the fluorescent tube are cut into a glass tube portion and an electrode portion, and the obtained glass tube portion is crushed into a glass piece. This glass piece is accommodated in a cylindrical drum, and the cylindrical drum is A method has also been proposed in which the fluorescent film is peeled and removed by rubbing the surface of a glass piece with a brush body installed in a cylindrical drum while rotating, and the peeled fluorescent material and mercury are sucked and removed (for example, patents). Reference 2). Further, both ends of the fluorescent tube are cut into a glass tube part and an electrode part, and the obtained glass tube part is crushed into a glass piece. This glass piece is mixed and stirred with a rubber piece in a container, and glass is obtained. There has also been proposed a method in which a fluorescent film on one surface is peeled and removed by friction of a rubber piece, and a powder comprising a fluorescent material and a fine piece of glass is separated from a glass piece by a sieve or the like (see, for example, Patent Document 3). ).
JP 2004-57957 A JP 2001-286828 A JP-A-51-86285

  However, the method of Patent Document 1 requires a scouring material, and since the scouring material is mixed with the compressed air and sprayed, there is a problem that the apparatus is complicated and the equipment cost becomes high. In the case of an annular fluorescent tube (hereinafter referred to as “annular fluorescent tube”), the adhesion of the fluorescent film is higher than that of a straight tube fluorescent tube (hereinafter referred to as “straight tube fluorescent tube”). In addition to the fact that it is strengthened, the fluorescent film is difficult to fall off, and because the polishing material mainly passes through the outer peripheral part of the arcuate glass tube due to the action of centrifugal force, the fluorescent film on the inner peripheral part of the glass tube is difficult to remove. There was also a problem. Furthermore, if the glass tube is broken during the blasting process, the blast material is mixed with the broken glass tube, which makes it difficult to deal with troubles.

  The methods of Patent Document 2 and Patent Document 3 have the advantage that they can be processed regardless of the type of fluorescent tube. However, the surface of the crushed fine glass piece is removed by rubbing with a brush body or rubber piece. The probability of contact between the surface of the glass piece to be removed and the brush body and the rubber piece is low, and the glass piece needs to stay in the container for a long time, which has been an obstacle to improving the processing efficiency. There is also a problem that the equipment structure is complicated and the equipment cost is high.

The present invention has been made in view of the above circumstances. The purpose of the present invention is to provide a fluorescent film made of a fluorescent material or the like applied to the inner surface of a glass tube of a fluorescent tube, regardless of the shape of the fluorescent tube. at the same time separated from quickly and reliably and inexpensively glass tube, it is possible to recover separately from the glass fragments quickly peeled fluorescent film is to provide a glass cleaning how the fluorescent tube.

The glass purification method for a fluorescent tube according to the first invention for solving the above-described problems includes a cutting step of removing the base portion of the fluorescent tube, and a grinding of the glass tube portion of the fluorescent tube from which the base portion has been removed by the cutting step Then, a pulverization process for peeling the fluorescent film applied to the inner surface of the glass tube, and a classification process for separating the pulverized product obtained by the pulverization process into fluorescent powder and glass particles as the peeled fluorescent film in this order. The fluorescent tube has a glass purification method, and in the pulverization step, the glass tube portion of the fluorescent tube from which the cap portion has been cut and removed is pulverized so that the average particle diameter of the glass particles is within a range of 100 μm to 3 mm. The fluorescent film applied on the inner surface of the glass tube is peeled off from the glass tube as fluorescent powder, and in the classification step, the glass particles and the fluorescent powder are separated and recovered from the pulverized product in which the peeled fluorescent powder and glass particles are mixed. You It is characterized in.

The glass purification method for a fluorescent tube according to a second invention is the method of the first invention, further comprising heating or pickling the glass particles recovered from the pulverized product to remove mercury remaining in the glass particles. It is characterized by.

  In the present invention, the glass tube portion of the fluorescent tube in which the fluorescent film is applied is pulverized by the pulverizer. The fluorescent film is forcibly and efficiently peeled from the glass tube by the impact force at the time of crushing or by finely crushing the glass tube portion. After pulverization, the fluorescent powder, which is the fluorescent film peeled off using a classifier, and glass particles are separated and recovered. Thereby, the fluorescent film apply | coated inside the glass tube can be peeled and isolate | separated, and the purified glass particle can be obtained.

  In this case, it is preferable to grind | pulverize so that the average particle diameter of the glass particle after grinding | pulverization may exist in the range of 100 micrometers-3 mm. The average particle size of the fluorescent powder produced by peeling off the fluorescent film is about 10 μm. When the glass particles are pulverized to the same size as the fluorescent powder, it is difficult to separate the two after pulverization. Therefore, for the purpose of facilitating the separation of the two, the preferred lower limit of the average particle size of the glass particles is set to 100 μm, on the other hand, in order to peel the fluorescent film from the glass tube, the smaller the particle size of the glass particles is desirable, The suitable upper limit of the average particle diameter of the glass particles was 3 mm.

  A part of mercury enclosed in the fluorescent tube is released as mercury gas into the atmosphere gas when the base part is cut, but most of the mercury adheres to the fluorescent film and remains in the glass tube part. However, since the fluorescent film and the glass particles are separated, mercury attached to the fluorescent film is also separated from the glass particles. However, a small amount of mercury may remain in the collected glass particles. When it is necessary to remove this small amount of residual mercury, the collected glass particles are heated or pickled to remain on the glass particles. By removing mercury that is present, cleaner glass particles can be obtained.

  In addition, since the cap part of the fluorescent tube is cut in a sealable processing container, the gaseous mercury enclosed in the fluorescent tube can be processed without being discharged to the outside, and environmental pollution by mercury is prevented. Can do.

  According to the present invention, the fluorescent film on the inner surface of the glass tube is forcibly separated from the glass tube by crushing the glass tube part, and the separated fluorescent film is separated from the glass particles and collected by the classifying device. Whether it is a straight tube type fluorescent tube or an annular type fluorescent tube, the fluorescent film can be manufactured very quickly and reliably, and with a simpler and more compact process and apparatus than conventional ones. The removed fluorescent film can be recovered simultaneously with the removal. Thereby, the purified glass particles can be obtained, and the recycling treatment of the waste fluorescent tube is achieved at low cost and efficiently, and the industrial effect is exceptional.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is an overall schematic diagram of a recycling process of waste fluorescent tubes according to the present invention, and FIGS. 2 to 4 are detailed views of each divided portion when FIG. 1 is divided into three by a one-dot chain line.

  In these drawings, a die cutting machine 5, a pulverizing device 6 and a classifying device 7 are devices for peeling the fluorescent film on the inner surface of the waste fluorescent tube 1 and separating the peeled fluorescent film from the crushed glass particles. As shown in FIG. 1, among these devices, the die cutting machine 5 is stored in a sealable processing container 3, and the pulverizing device 6 and the classification device 7 are stored in the processing container 4. The processing container 4 basically has a structure that can be sealed in the same manner as the processing container 3, but the pulverizing apparatus 6 and the classifying apparatus 7, for example, when the classifying apparatus 7 is a cyclone and the pulverizing apparatus 6 is connected to the cyclone. Can be processed under a pressure lower than the atmospheric pressure by suction of the suction gas pipe 16, in other words, the exhaust gas of the pulverizing device 6 and the classification device 7 does not leak into the atmosphere and is discharged to the suction gas pipe 16. If absorbed, the processing container 4 does not need to be sealed, and further, the processing container 4 itself becomes unnecessary. Each device may be stored in the same processing container.

  In order to recycle the glass tube portion from the waste fluorescent tube 1, first, it is necessary to cut and remove the base portion made of metal from the waste fluorescent tube 1. By the way, the fluorescent tubes are roughly classified into three types, that is, a straight fluorescent tube, an annular fluorescent tube, and other irregular fluorescent tubes, and the base portion is, for example, both ends in the case of a straight fluorescent tube. In the case of an annular fluorescent tube, it is arranged at the center, and when trying to cut the base part with one base cutting machine, the structure of the base cutting machine becomes complicated, and on the contrary, the cutting efficiency decreases. Incurs frequent equipment troubles. Therefore, in the present embodiment, as shown in FIG. 2, three types of die cutting machines 5 and 5A are provided according to three types of waste fluorescent tubes 1 such as a straight tube type fluorescent tube, an annular fluorescent tube, and a deformed fluorescent tube. , 5B (the base cutting machine 5 is for a straight fluorescent tube, the base cutting machine 5A is for an annular fluorescent tube, and the base cutting machine 5B is for a deformed fluorescent tube). Therefore, regardless of the shape of the waste fluorescent tube 1, an efficient cutting process of the base portion is possible. As the die cutting machines 5, 5A, 5B, a diamond cutter or the like can be used.

As shown in FIG. 2, the waste fluorescent tube 1 carried into the processing container 3 by the carry-in device 2 is cut and removed by the die cutting machines 5, 5 </ b> A, and 5 </ b> B. Thereby, the internal airtightness of the waste fluorescent tube 1 is destroyed. The internal pressure of the fluorescent tube is usually as low as 10 ⁻⁵ atm, and mercury exists in a gas state. Accordingly, due to this hermetic breakdown, a part of the mercury sealed inside is released into the processing vessel 3 while remaining in the gaseous mercury 12, and the remainder is liquefied.

  In this case, when the waste fluorescent tube 1 is a straight tube type fluorescent tube, the base portions at both ends are removed by the base cutting machine 5 to open the cross sections at both ends, and when the waste fluorescent tube 1 is an annular fluorescent tube, the base is formed. The base part is cut and removed by the cutting machine 5A to open the cross sections at both ends, and the base part is cut and removed by the base cutting machine 5B according to the shape even in the case of a modified fluorescent tube. The removed base portion 8 is recovered, and after the base portion 8 is crushed, it is sorted into three types of aluminum, residue, and other metals by a magnetic separator and an aluminum separator. 17 ”) for recycling and the residue is disposed of as landfill.

  The glass tube portion 9 from which the cap portion has been removed in this way is pulverized by the pulverizing device 6. At that time, as described above, it is preferable to grind so that the average particle diameter of the glass particles 15 produced by the grinding is in the range of 100 μm to 3 mm. As the pulverizing device 6, a conventional roll crusher, a self-pulverizing machine (elow fall mill), a stamp mill, or the like can be used. By this pulverization treatment, the fluorescent film applied to the inside of the glass tube is forcibly separated, and fluorescent powder 11 is generated. The fluorescent film in the glass tube portion 9 contains the mercury liquefied when the cap of the waste fluorescent tube 1 described above is mixed and attached. Therefore, the generated fluorescent powder 11 is mixed and attached with mercury. ing.

  The pulverized product 10 in which the glass particles 15 and the fluorescent powder 11 obtained by the pulverizing device 6 are mixed is introduced into the classifying device 7, and the pulverized product 10 is separated into the glass particles 15 and the fluorescent powder 11 by the classifying device 7. The particles 15 are collected. In this case, the average particle diameter of the fluorescent powder 11 is about 10 μm, while the average particle diameter of the glass particles 15 is 100 μm to 3 mm, and it is necessary to separate them with high accuracy. As the classification device 7 for this purpose, a centrifugal separator (such as a cyclone) that performs classification using centrifugal force can be used. 1 and 2 show an example in which a cyclone is used as the classification device 7.

  The fluorescent powder 11 separated from the glass particles 15 by the classifier 7 is sucked into the dust separator 19 through the suction gas pipe 16 together with the exhaust gas 14 discharged from the classifier 7. At the same time, the atmosphere gas 13 inside the processing vessel 3 containing the gaseous mercury 12 ejected at the time of the die cutting by the die cutting machines 5, 5A, 5B merges with the suction gas piping 16 through the suction gas piping 16A, The atmospheric gas 13 and the exhaust gas 14 are mixed and sucked into the dust separation device 19 as waste gas 18. Further, the exhaust gas from the pulverizer 6 is also sucked by the suction gas pipe 16 as the exhaust gas 14. Here, a gas in which the atmospheric gas 13 containing gaseous mercury 12 and the exhaust gas 14 of the pulverizer 6 and the classifier 7 are mixed is referred to as a waste gas 18. Alternatively, the fluorescent powder 11 may be collected by the classifier 7, the collected fluorescent powder 11 may be temporarily stored, and the stored fluorescent powder 11 may be processed by a fluorescent powder processing device 26 described later.

  The processing container 3 only needs to satisfy that the atmospheric gas 13 leaks to the outside of the processing container 3 and mercury contamination does not occur and that the suction efficiency of the atmospheric gas 13 from the processing container 3 does not decrease. What is necessary is just a container sealed so that it may become a negative pressure. In the case where the processing container 4 also has a sealed structure, it should conform to this. Moreover, it is not necessary to carry out the waste fluorescent tube 1 into the processing vessel 3 and the glass tube portion 9 from the processing vessel 3 continuously, and batch carrying in and batch carrying out may be used.

  The dust separator 19 is a device that separates and removes the fluorescent powder 11 and mercury from the waste gas 18. As shown in FIG. 3, the dust separator 19 includes a cyclone 20, a bag filter 21, a blower 22, and an activated carbon adsorption tower 23 arranged in series. It is configured. The waste gas 18 is sucked by the blower 22 and enters the dust separation device 19 through the suction gas pipe 16. However, the cyclone 20 is not necessarily required and may be directly introduced into the bag filter 21.

  The waste gas 18 is first sent to the cyclone 20, and the fluorescent powder 11 containing mercury is separated and recovered from the waste gas 18. The waste gas 18 discharged from the cyclone 20 is introduced into the bag filter 21, and mercury and the fluorescent powder 11 in the waste gas 18 are further separated and removed by the bag filter 21. The fluorescent powder 11 and mercury collected by the cyclone 20 and the bag filter 21 are collected as a mercury-containing fluorescent powder 24, and the mercury-containing fluorescent powder 24 is conveyed to a fluorescent powder processing device 26 in the next step. The exhaust gas 25 after passing through the bag filter 21 passes through the activated carbon adsorption tower 23 and is then diffused into the atmosphere. The activated carbon adsorption tower 23 is an apparatus for collecting a small amount of mercury contained in the exhaust gas 25 after passing through the bag filter 21.

  As shown in FIG. 3, the fluorescent powder processing device 26 includes a vacuum heating device 27, a condenser 28, a vacuum pump 29, and an activated carbon adsorption tower 30. The mercury-containing fluorescent powder 24 is charged into a vacuum heating device 27 and heated to become mercury vapor 31, sucked by a vacuum pump 29, enters a condenser 28, where it is cooled to become metallic mercury, and mercury 34 Is recovered. On the other hand, the vacuum heating device 27 collects the fluorescent material 33 generated by separating and removing mercury from the mercury-containing fluorescent powder 24. As the recovered fluorescent material 33, a material that is substantially free of mercury and safe in quality can be stably obtained. The fluorescent material 33 and the mercury 34 are each recycled.

  The exhaust gas 32 sucked by the vacuum pump 29 is introduced into the activated carbon adsorption tower 30 and a trace amount of mercury remaining in the exhaust gas 32 is collected by the activated carbon adsorption tower 30 and then diffused into the atmosphere.

  When the glass particles 15 separated and collected by the classifier 7 have achieved environmental standards that should be satisfied during the glass recycling process, the separated and collected glass particles 15 can be immediately recycled. On the other hand, if for some reason, the separated and collected glass particles 15 do not achieve the environmental standards to be satisfied during the glass recycling process, a process for removing a trace amount of mercury remaining on the glass particles 15 may be added. Necessary. Naturally, even when the glass particles 15 achieve the environmental standard, a mercury removing step may be added to enhance safety.

  As a means for removing a trace amount of residual mercury, it can be performed by two kinds of methods, pickling treatment and heat treatment. First, the pickling process will be described. The pickling treatment is a method for removing residual mercury by a pickling process using an appropriate diluted acid.

  In order to perform the pickling treatment, the separated and collected glass particles 15 are conveyed to the pickling apparatus 35. As shown in FIG. 4, the pickling device 35 includes a pickling tank 36 and a waste acid treatment device 37, receives glass particles 15, and a trace amount of mercury and fluorescent powder remaining on the glass particles 15 with diluted acid 38. By pickling and removing the glass particles 15, the glass particles 15 can be reused for recycled glass, lightweight aggregates, tiles, furniture materials, glass wool, and the like. That is, the apparatus is intended to recover the cleaned glass particles 42. Even if an amount of mercury exceeding 0.005 mg / l, which is the upper limit of mercury elution according to environmental standards, remains on the glass particles 15, the pickling device 35 stably stabilizes this residual mercury elution. It can be lowered to 0.005 mg / l or less.

  Here, among the pickling conditions, the type of acid, the acid concentration, the temperature of the pickling solution and the pickling time are important, but in order to make pickling work safe, the temperature of the pickling solution is It is desirable to carry out at room temperature. As the type of acid, hydrochloric acid, nitric acid or sulfuric acid is desirable from the viewpoint of ease of handling and waste acid treatment, and hydrochloric acid is particularly desirable from the viewpoint of mercury removal effect and handling and wastewater treatment. As the acid concentration and the treatment time, when the residual amount of mercury is about 0.03 to 0.09 mg / l as the elution amount, the size of the glass particles 15 is 95 mm% or more when the size is 15 mm or less. When hydrochloric acid is used in the case of immersion pickling in a still bath at room temperature, it is desirable to immerse in diluted hydrochloric acid of 1.0 N or more, more preferably 1.5 N for 2 hours or more. If the hydrochloric acid concentration is less than this, it becomes difficult to stably reduce the elution amount of residual mercury to 0.005 mg / l or less. Also, when using nitric acid or sulfuric acid, almost the same conditions as when hydrochloric acid is used are necessary. If the elution amount of the mercury residual amount changes, the treatment time may be changed as appropriate. After pickling, water washing is performed to remove the acid.

  Waste acid 39 discharged from the pickling tank 36 after pickling is neutralized by a predetermined waste acid treatment device 37, and the eluted mercury is made insolubilized mercury 41 such as mercury sulfide, and neutralized water 40 is drained. Dispose of insolubilized mercury 41. In FIG. 4, the pickling tank 36 and the waste acid treatment device 37 are directly connected, but it is not necessary to directly connect both of them. The waste acid 39 is temporarily stored in a container and transported to the waste acid treatment device 37 to be discarded. You may acid-treat.

  Next, the heat treatment will be described. The heat treatment is a method in which the glass particles 15 are heated to the boiling point of mercury or more to volatilize and remove mercury.

  In order to perform the heat treatment, the separated and recovered glass particles 15 are conveyed to the heat treatment apparatus 43. As shown in FIG. 4, the heat treatment apparatus 43 includes a heating furnace 44, a condenser 45, a blower 46, and an activated carbon adsorption tower 47. The glass particles 15 are charged into the heating furnace 44 and heated to become mercury vapor 48, which is sucked by the blower 46 and enters the condenser 45, where it is cooled to become metallic mercury, and the mercury 51 is recovered. . On the other hand, from the heating furnace 44, glass particles 50 from which mercury has been separated and removed are recovered. The recovered glass particles 50 have a residual mercury elution amount of 0.005 mg / l or less, and the glass particles 50 that are safe in quality and substantially free of mercury can be stably obtained. The collected glass particles 50 and mercury 51 are each recycled. On the other hand, the exhaust gas 49 sucked by the blower 46 is introduced into the activated carbon adsorption tower 47, and a trace amount of mercury remaining in the exhaust gas 49 is collected by the activated carbon adsorption tower 47 and then diffused into the atmosphere. Since the mercury remaining in the glass particles 15 is small, the exhaust gas from the heating furnace 44 is directly passed to the activated carbon adsorption tower 47 without installing the condenser 45 for condensing the mercury vapor 48, that is, without using the mercury for recycling. It may be introduced and disposed of.

  As described above, the recycling process of the waste fluorescent tube 1 is performed.

  In the present embodiment, three series of activated carbon adsorption towers 23, activated carbon adsorption tower 30 and activated carbon adsorption tower 47 are provided, but these may be integrated into one series or two systems. Further, as a method for removing mercury in the exhaust gas 25, the exhaust gas 32, and the exhaust gas 49, as in the activated carbon adsorption towers 23, 30, and 47, an oxidizing agent such as ferric chloride is attached to the activated carbon to oxidize the mercury gas. In addition to the adsorption removal method, a divalent mercury compound may be preliminarily passed through an oxidizing agent, and in this state, the adsorption may be performed by adsorption onto a chelate resin having a thiol group. Further, in addition to the mercury removal method by these dry adsorption methods, in the case where metallic mercury is also contained in the exhaust gas 25, 32, 49, as a wet oxidation absorption method of mercury, in the exhaust gas 25, 32, 49 It is preferable to add a device that oxidizes metallic mercury with an oxidizing agent and absorbs it in a solution to which water-soluble sulfide is added, and removes it as a water-insoluble mercury sulfide precipitate.

  In this way, by purifying the glass tube portion 9 of the fluorescent tube using the fluorescent tube glass purification device according to the present invention, it is extremely quick and reliable and simpler than the conventional fluorescent film removing device. In addition, the fluorescent film on the inner surface of the fluorescent tube can be removed by a compact apparatus. Moreover, according to the recycling method of the waste fluorescent tube 1 according to the present invention, in addition to these effects, the amount of mercury remaining in the glass particles can be stably reduced below the environmental standard. Recycling of the fluorescent tube 1 is achieved at low cost and efficiently.

It is the whole schematic diagram of the recycling process process of the waste fluorescent tube concerning this invention. FIG. 2 is a partial detailed view in FIG. 1, which is a detailed view focusing on a die cutting machine, a classification device and the like. FIG. 2 is a partial detailed view in FIG. 1, which is a detailed view focusing on a dust separation device and fluorescent powder processing equipment. FIG. 2 is a partial detail view in FIG. 1, which is a detail view focusing on a pickling apparatus and a heat treatment apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Waste fluorescent tube 2 Carry-in apparatus 3 Processing container 4 Processing container 5 Cap cutting machine 6 Crushing apparatus 7 Classification apparatus 8 Base part 9 Glass tube part 10 Ground product 11 Fluorescent powder 12 Gaseous mercury 13 Atmospheric gas 14 Exhaust gas 15 Glass particle 16 Gas piping for suction 17 Recovery of aluminum 18 Waste gas 19 Dust separator 20 Cyclone 21 Bag filter 22 Blower 23 Activated carbon adsorption tower 24 Mercury-containing fluorescent powder 25 Exhaust gas 26 Fluorescent powder treatment device 27 Vacuum heating device 28 Condenser 29 Vacuum pump 30 Activated carbon Adsorption tower 31 Mercury vapor 32 Exhaust gas 33 Fluorescent material 34 Mercury 35 Pickling device 36 Pickling tank 37 Waste acid treatment device 38 Diluted acid 39 Waste acid 40 Neutralized water 41 Insolubilized mercury 42 Glass particles 43 Heat treatment device 44 Heating furnace 45 Condenser 46 Blower 47 Activated carbon adsorption tower 4 8 Mercury vapor 49 Exhaust gas 50 Glass particles 51 Mercury

Claims (2)

A cutting process for removing the cap part of the fluorescent tube, a crushing process for crushing the glass tube part of the fluorescent tube from which the cap part has been removed by the cutting process and peeling the fluorescent film applied to the inner surface of the glass tube, and a crushing process A method for purifying a fluorescent tube having the order of separating the obtained pulverized product into fluorescent powder and glass particles as separated fluorescent films in this order,
In the pulverization step, the fluorescent tube coated on the inner surface of the glass tube by pulverizing the glass tube portion of the fluorescent tube from which the base portion has been cut and removed so that the average particle size of the glass particles is in the range of 100 μm to 3 mm. Fluorescent powder is separated from a glass tube, and in the classification step, the glass particles and the fluorescent powder are separated and recovered from a pulverized product in which the separated fluorescent powder and glass particles are mixed. Purification method.   Furthermore, the glass particle recovered from the pulverized product is heated or pickled to remove mercury remaining in the glass particle, and the glass purification method for a fluorescent tube according to claim 1, wherein

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