JP2005349276A - Cleaning method for fluorescent vessel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To apply appropriate and efficient mercury removal to crushed glass grain pieces when a fluorescent vessel is cleaned by discharging the fluorescent film and mercury from a glass pipe of the fluorescent vessel, thereafter, crushing the glass pipe and applying removal treatment of remaining mercury to the thus obtained crushed glass grain pieces. <P>SOLUTION: Compression gas is blown to an inner surface of the glass pipe of the fluorescent vessel 1 cut/removed with a base part from one end to the other end or a grinding material is blown with the compression gas and the fluorescent film coated on an inner surface of the glass pipe and the mercury filled in the glass pipe are discharged from the glass pipe. Then, the glass pipe 6 is cut to at least three parts of two end parts and one central part and the glass pipe is sorted to the end parts 8 and the central part 9 to recover them. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a fluorescent tube purification method performed for recycling a used 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 having a protective film such as barium oxide formed 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 in 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 the glass is recovered from the used waste fluorescent tube that is generated in large quantities, This will greatly contribute not only to resource and energy conservation but also to the reduction of waste.

  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, the recycling process has been conventionally performed by various methods. For example, in Patent Document 1, a step of removing the base portions on both sides of the waste fluorescent tube, and an air flow is introduced into the glass tube portion of the waste fluorescent tube from which the base portion has been removed to remove substances inside the glass tube. Proposing a method for treating a waste fluorescent tube comprising: a step, a step of crushing a glass tube part from which the substance has been removed by an air stream, and a step of heating mercury pieces from the broken glass tube part to remove mercury from the broken pieces Has been. In Patent Document 2, both ends of a waste fluorescent tube are cut and separated into a glass tube portion and an electrode portion, and then compressed gas is injected into the glass tube portion to discharge the fluorescent film and mercury, There has been proposed a method of crushing a glass tube part and pickling the obtained crushed glass particle pieces to remove mercury remaining in the crushed glass particle pieces.

JP-A-9-150138 JP 2002-177935 A

  As shown in Patent Document 1 and Patent Document 2, conventionally, after the fluorescent film and mercury inside the glass tube are discharged by an air flow such as compressed gas, the remaining mercury is further removed by heat treatment or pickling treatment. In addition, all the pieces of crushed glass particles obtained by crushing are heat-treated or pickled, which increases the cost of residual mercury removal.

  The present invention has been made in view of such circumstances, and an object of the present invention is to inject a compressed gas into the glass tube of the fluorescent tube, or to inject a polishing material together with the compressed gas so as to fluoresce from the glass tube. The membrane and mercury are discharged, and then the glass tube is crushed. The obtained crushed glass particle pieces are subjected to the removal of residual mercury, and when purifying the fluorescent tube, the It is another object of the present invention to provide a fluorescent tube purification method that enables efficient mercury removal treatment.

  In order to solve the above problems, the present inventors investigated the distribution of mercury remaining inside the glass tube after the compressed gas was injected. The survey is to cut the glass tubes after jetting the compressed gas at intervals of 40 mm in the longitudinal direction, crush each cut glass tube, dissolve in 50% nitric acid, and the content of mercury dissolved in nitric acid Was measured.

  As a result, as shown in FIG. 1, the residual mercury distribution in the glass tube is not uniform in the longitudinal direction of the glass tube, as shown in FIG. It was found that the residual amount was large in the vicinity of the base part where the filament electrode was installed, decreased rapidly to a position about 200 mm away from the base part, and small in the central part of the fluorescent tube. As shown in FIG. 1, this tendency was the same on the compressed air blowing side and the compressed air outlet side, and it was confirmed that this tendency was not caused by the difference in the spray state of the compressed air.

  From this investigation result, the knowledge that it was possible to change the removal processing method of the mercury which remains in the glass particle piece after crushing according to the site | part of a glass tube was acquired. In other words, the crushed glass particle piece in the central portion of the glass tube where the residual amount of mercury is small is subjected to a mild mercury removal treatment such as shortening the pickling time compared to the crushed glass particle piece near the mouthpiece. In addition, it has been found that the mercury removal process itself can be omitted. In patent document 1 and patent document 2 mentioned above, the glass tube part after discharging | emitting fluorescent film and mercury with compressed gas is crushed collectively, and the crushed glass particle piece obtained by crushing is heat-processed collectively. Alternatively, it is pickled, and it can be seen that the crushed glass particle pieces in the central portion are subjected to excessive purification treatment, that is, wasteful purification treatment.

  The present invention has been made on the basis of the above knowledge, and the fluorescent tube purification method according to the first aspect of the present invention provides an inner surface of a fluorescent tube from which the base portion has been cut and removed, from one end to the other. A compressed gas is blown toward the end portion or a polishing material is blown together with the compressed gas, and the fluorescent film applied to the inner surface of the glass tube and mercury enclosed in the glass tube are discharged from the glass tube, and then the glass tube Is cut into at least three parts of two end parts and one central part, and the glass tube is separated into an end part and a central part and collected.

  According to a second aspect of the present invention, there is provided a method for purifying a fluorescent tube, in which a compressed gas is blown from one end to the other end of a fluorescent tube from which a cap portion has been cut and removed, or polished together with the compressed gas. The scavenging material is sprayed to discharge the fluorescent film applied to the inner surface of the glass tube and the mercury enclosed in the glass tube from the glass tube, and then the glass tube is divided into two end portions and one central portion. Cut into at least three parts, and separate and collect the glass tube into the end part and the central part, crush each separately collected glass tube separately, and individually with respect to the obtained crushed glass particle pieces The mercury removal treatment is performed.

  According to a third aspect of the present invention, there is provided a method for purifying a fluorescent tube, wherein a compressed gas is blown from one end portion to the other end portion of the fluorescent tube from which the cap portion has been cut and removed, or polished together with the compressed gas. The scavenging material is sprayed to discharge the fluorescent film applied to the inner surface of the glass tube and the mercury enclosed in the glass tube from the glass tube, and then the glass tube is divided into two end portions and one central portion. Cut into at least three parts, separate and collect the glass tube into an end part and a central part, crush each separately collected glass tube, and obtain a crushed glass obtained from the end part of the glass tube Grain fragments are recycled as glass cullet after mercury removal treatment, and the crushed glass particles obtained from the central part of the glass tube are recycled as glass cullet in a crushed state. It is an.

  According to a fourth aspect of the present invention, there is provided the fluorescent tube purification method according to any one of the first to third aspects, wherein the fluorescent tube has a length of 500 mm or more and a boundary between the end portion and the central portion. The position is at least 200 mm away from the base.

  According to the present invention, the compressed gas or the glass tube in which the compressed gas and the polishing material are jetted to discharge the internal fluorescent film and mercury, the residual mercury-rich end portion near the base portion, and the residual Because it collects and collects in two parts, the central part of the glass tube with less mercury, it is possible to perform an appropriate mercury removal process according to the amount of mercury remaining in the glass tube, and the residual mercury removal process Industrially beneficial effects such as a significant reduction in the cost required for the production are achieved.

  Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. FIG. 2 is a process diagram of the fluorescent tube purification method according to the present invention.

  As shown in FIG. 2, first, the fluorescent tube 1 such as a waste fluorescent tube is inserted into the sealed container 2 using an appropriate transport device (not shown) such as a belt conveyor. An open burner 3, a base cutting machine 4, and a compressed gas injection device 5 are provided inside the sealed container 2. Further, the sealed container 2 is connected to a dust collection equipment 17 equipped with a cyclone or a bag filter, and the atmospheric gas inside the sealed container 2 and the gas injected from the compressed gas injection device 5 are collected in the dust collection equipment 17. The dust in the gas is collected as a dust collection 18. That is, the sealed container 2 is a device that peels off the fluorescent film on the inner surface of the fluorescent tube 1 without diffusing mercury enclosed in the fluorescent tube 1 to the outside environment. 1 is an apparatus that collects mercury and a fluorescent substance in the inside of 1 as a dust collection object 18. The fluorescent tube 1 can be processed by either a straight fluorescent tube or a circular fluorescent tube.

The fluorescent tube 1 carried into the inside of the hermetic container 2 is first opened through the tube wall by the opening burner 3, and the internal airtightness of the fluorescent tube 1 is destroyed. The internal pressure of the fluorescent tube 1 is lower and usually about 10 ^-5 atmospheres, mercury present in the gas state. Therefore, due to this hermetic breakdown, a part of the mercury sealed inside is released into the sealed container 2 as gaseous mercury, and the remaining part is liquefied. Next, the base part at both ends of the fluorescent tube 1 is cut and removed by using the base cutting machine 4. The removed base portion is recovered, and the base metal 16 such as aluminum or brass is recovered from the recovered base portion by a conventional method and recycled.

  In this way, the compressed gas is blown from the compressed gas injection device 5 toward the inner surface of one end portion of the glass tube whose both end sections are open, and the compressed gas is ejected from the other end portion of the glass tube. The fluorescent film applied to the inner surface is peeled off and blown away. The fluorescent film in the glass tube contains mercury liquefied when the above-described fluorescent tube 1 is pierced and adhered, and the liquefied mercury is also blown off together with the fluorescent film. As the compressed gas, compressed air obtained by a compressor (not shown) or compressed nitrogen sealed in a cylinder can be used. In FIG. 2, the compressed gas injection device 5 is installed inside the sealed container 2. However, the compressor or the cylinder need not be arranged inside the sealed container 2, and the compressed gas injection device 5 in this case is as follows. It becomes the gas piping connected to the nozzle for blowing and the nozzle for blowing.

  In this case, in order to promote the removal of the fluorescent film, it is preferable to mix the abrasive with the compressed gas and blow the abrasive with the compressed gas. As the polishing material to be used, it is preferable to use glass beads having a particle size of 50 μm or more and 500 μm or less from the viewpoint of efficiently peeling the fluorescent film from the glass tube without damaging the glass tube. It is preferable to adjust the flow rate of the compressed gas in the glass tube so that it is 200 m / second or less in a straight tube fluorescent tube and 100 m / second or less in a circular fluorescent tube. The polishing material is separated and collected from the fluorescent powder and mercury by the dust collection equipment 17, and is used repeatedly.

  The fluorescent powder containing mercury generated by removing the fluorescent film on the inner surface of the glass tube is sucked into the dust collecting equipment 17 together with the atmospheric gas in the sealed container 2. In addition, gaseous mercury released into the sealed container 2 is also sucked into the dust collection facility 17 together with the atmospheric gas in the sealed container 2. On the other hand, the glass tube part 6 from which the internal fluorescent film has been peeled and removed is conveyed to the glass tube cutting machine 7.

  The dust collection 18 made of the fluorescent powder and mercury collected by the dust collection equipment 17 is inserted into the vacuum heating device 19 and heated, and the mercury becomes mercury vapor and enters the condenser 20 where it is cooled. Mercury becomes mercury and mercury 22 is recovered. On the other hand, from the vacuum heating device 19, the fluorescent powder 21 generated by separating and removing mercury from the collected dust 18 is collected. As the recovered fluorescent powder 21, a quality-safe product that is substantially free of mercury can be stably obtained. Each of the fluorescent powder 21 and the mercury 22 is recycled.

  As for the exhaust gas discharged from the dust collection equipment 17 and the exhaust gas discharged from the condenser 20, a very small amount of mercury contained in the exhaust gas is collected via, for example, an activated carbon adsorption tower (not shown). Later, it is released into the atmosphere.

  Note that the airtight container 2 does not cause mercury contamination due to the atmospheric gas leaking out of the airtight container 2, and that the suction efficiency of the atmospheric gas from the airtight container 2 in the dust collection facility 17 does not decrease. It is sufficient that the container is satisfied, and therefore, any container that is substantially sealed can be used. In addition, although the processing capability of the fluorescent tube 1 is improved by installing the opening burner 3, the function of the opening burner 3 can be provided to the base cutting machine 4, and the installation of the opening burner 3 is omitted. You can also. As the opening burner 3, for example, a hydrogen burner is desirable.

  In the glass tube cutter 7, the glass tube part 6 is cut into at least three parts, two end parts and one central part, and the cut glass tube is divided into an end part 8 and a central part 9. Collect separately. In this case, attention is paid to the cutting position of the glass tube portion 6 so that the boundary position between the end portion 8 and the central portion 9 is at a position 200 mm or more away from the base. In FIG. 2, the glass tube cutting machine 7 is arranged independently of the sealed container 2, but the glass tube cutting machine 7 may be arranged inside the sealed container 2.

  Thereafter, the obtained end portion 8 and central portion 9 are crushed separately using a crusher 10 and a crusher 11 to obtain pieces of crushed glass particles. If the end portion 8 and the central portion 9 are crushed separately, the crusher 10 and the crusher 11 may be the same equipment. However, between the crushing timing of the end portion 8 and the crushing timing of the central portion 9, the crushing glass particles of the end portion 8 and the crushing glass particles of the central portion 9 are cleaned by cleaning the crusher. It is preferable that the pieces are not mixed as much as possible. From the viewpoint of omitting such measures for preventing mixing, it is desirable to use dedicated crushers for the end portion 8 and the central portion 9.

  In this crushing process, a crushing size is set according to the post-processing process of the obtained crushing glass particle piece. That is, the end portion 8 has a large residual amount of mercury only by spraying a compressed gas or spraying a compressed gas and a polishing material, and it is impossible to stably clear the environmental standards to be satisfied during the glass recycling process. Therefore, on the premise that a process of removing a trace amount of mercury is performed, the environmental standard must be cleared as a necessary and sufficient condition, and the crushed glass can be recycled as efficiently as possible. The central portion 9 can be used when the environmental standard to be satisfied during the glass recycling process can be cleared only by the purification process by the compressed gas injection device 5 as in the case where the abrasive is sprayed together with the compressed gas. Can be recycled immediately after the crushing treatment, and therefore the crushing size is such that the crushed glass particles can be recycled as efficiently as possible. In other words, it is crushed to a size that meets the demand for recycling, and the crushed broken glass particles are recovered as glass cullet 14A that can be reused for recycled glass, lightweight aggregate, tile, furniture, etc. To do. However, even in the case of the central portion 9, if it is necessary to add a process for removing the remaining mercury, the environmental standard must be cleared as necessary and sufficient as in the end portion 8, and the ground glass Use a crushing size that can be recycled as efficiently as possible.

  In the present embodiment, as a method for removing residual mercury, a pickling process using diluted acid is performed. In this case, the size of the crushed glass particles at the end portion 8 by the crusher 10 is 15 mm or less. It is desirable to process so that a glass particle piece may occupy 95 mass% or more. It is desirable to crush the crushed glass particle pieces of the central portion 9 so that the glass particle pieces of 15 mm or less occupy 95 mass% or more when the pickling process is performed.

  The crushed glass particle pieces at the end portion 8 and the crushed glass particle pieces at the central portion 9 that require residual mercury removal processing are transported to the pickling device 12 and the pickling device 13 and are separately pickled. . The pickling devices 12 and 13 pickle and remove a small amount of mercury and fluorescent powder remaining in the crushed glass particles by diluting acid to obtain a cleaned crushed glass particles, and use recycled glass and lightweight aggregate. This is an apparatus for collecting glass cullet 14, 14A that can be reused for tiles or furniture. Even if the amount of mercury that exceeds the upper limit of 0.005 mg / l, the mercury elution amount according to the environmental standards, remains in the crushed glass particles, the remaining mercury elution amount is stabilized by the pickling devices 12 and 13. And can be lowered to 0.005 mg / l or less. In addition, if the crushed glass particle piece of the edge part 8 and the crushed glass particle piece of the center part 9 are separately pickled, the pickling apparatus itself may be the same equipment.

  The pickling treatment needs to be applied so that the residual mercury elution amount is 0.005 mg / l or less, and therefore, the acid treatment applied to the crushed glass particle pieces of the end portion 8 having a large residual mercury amount, The pickling treatment applied to the crushed glass particle pieces of the central portion 9 having a small amount of residual mercury as compared with the end portion 8 can be performed by changing pickling conditions. That is, the crushed glass particle piece in the central portion 9 can be subjected to a mild pickling treatment as compared with the crushed glass particle piece in the end portion 8.

  Here, the conditions of the pickling process will be described. Among the pickling conditions, the type of acid, the acid concentration, the temperature of the pickling solution, and the pickling time are particularly important. The higher the temperature of the pickling solution, the higher the pickling speed. However, in order to make the pickling operation safe, it is desirable that the temperature of the pickling solution is 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 in particular, from the viewpoint of excellent mercury removal effect and ease of handling and wastewater treatment. It is preferable to use hydrochloric acid. As the acid concentration and treatment time, when the residual amount of mercury is about 0.03 to 0.09 mg / l in terms of the elution amount, the size of the crushed glass particles occupies 95 mass% or more when the size is 15 mm or less. As a standard, when hydrochloric acid is used in immersion pickling in a normal temperature and still bath, it is desirable to immerse in diluted hydrochloric acid of 1.0 N or more, more preferably 1.5 N or more for 2 hours or more. If the hydrochloric acid concentration is less than this, it will be difficult to stably reduce the elution amount of residual mercury to 0.005 mg / l or less. When the amount of residual mercury increases from 0.03 to 0.09 mg / l in the amount of elution, pickling treatment is performed so that the amount of residual mercury eluted is stably 0.005 mg / l or less. It is necessary to extend the time. On the other hand, when the residual mercury amount is less than 0.03 to 0.09 mg / l in the amount of elution, it is not necessary to immerse for 2 hours or more, and the pickling time Can be shortened. Further, when nitric acid or sulfuric acid is used, the reaction can be performed under substantially the same conditions as when hydrochloric acid is used.

  Therefore, by measuring the amount of mercury remaining in the crushed glass particle pieces of the end portion 8 and the crushed glass particle pieces of the central portion 9 before pickling, the crushed glass particle pieces of the end portion 8 and An appropriate pickling process according to the amount of residual mercury can be applied to the crushed glass particle pieces of the central portion 9. In addition, by collecting data on residual mercury determined for each type of fluorescent tube, it is possible to perform appropriate pickling treatment empirically based on the collected data without measuring the amount of residual mercury. Become.

  After pickling, the spent acid used is neutralized, and mercury eluted in the acid is recovered as insolubilized mercury 15 such as mercury sulfide, and the recovered insolubilized mercury 15 is disposed of. The crushed glass particle pieces that have been pickled are washed with water to remove the acid, and then subjected to an appropriate drying treatment such as natural drying or forced drying, and are subjected to recycling as glass cullet 14, 14A. In this way, the fluorescent tube 1 is recycled. In the above description, the pickling treatment is performed as a residual mercury removal treatment method, but other mercury removal methods such as heat treatment may be used.

  As described above, according to the fluorescent tube purification method according to the present invention, the inner fluorescent film and the glass tube portion 6 from which mercury has been discharged are separated from the remaining mercury-rich end portion 8 and the remaining mercury. Since it is separated and collected into two parts with a small central part 9, it becomes possible to perform an appropriate mercury removal process according to the amount of mercury remaining in the glass tube, greatly increasing the cost required for the residual mercury removal process Can be reduced.

  Holes were made in the wall of the five types of 40 W straight tube type waste fluorescent tubes with an open burner, and then the base portions at both ends of the waste fluorescent tube were cut and removed using a base cutter. Then, a glass bead as a polishing material was sprayed together with the compressed air inside the glass tube to discharge the fluorescent film and mercury. The glass tube thus prepared was cut at intervals of 100 mm from the base part side, and the cut glass tube was further crushed so that 15 mm or less accounted for 95 mass% or more, and the obtained crushed glass particle pieces Among them, the elution test of residual mercury with water was performed on the one in the range of 0 to 100 mm from the base part, the one in the range of 300 to 400 mm from the base part, and the one in the range of 500 to 600 mm from the base part. The dissolution test was carried out by immersing the crushed glass particles in water having a mass 10 times the mass of the crushed glass particles for 6 hours. The test results are shown in Table 1. In addition, if the elution amount of mercury is 0.005 mg / l or less of the environmental standard, it is not necessary to carry out a further mercury removing step on the crushed glass particle pieces.

  As shown in Table 1, although the absolute value of the mercury elution amount due to residual mercury differs depending on the type of the fluorescent tube, it was found that the mercury elution amount is high near the base portion and low at the central portion side of the fluorescent tube. Table 1 also shows the simple average value (average value with the same quantity) of the mercury elution amount in these five types of fluorescent tubes, and the crushed glass particles near the base part require a removal process of residual mercury. It was confirmed that. On the other hand, in the range of 300 to 400 mm from the base part, the simple average value of the mercury elution amount is 0.0026 mg / l, and when these five kinds of waste fluorescent tubes are mixed almost uniformly, On the other hand, it was confirmed that it was not necessary to carry out a further mercury removal process.

  From these results, the glass tube part cleaned with compressed air and abrasive is cut at a position of about 300 mm from the base part, and the collected end part is pickled to remove residual mercury and then glass. On the other hand, the collected central part was recycled as glass cullet after being crushed.

  As shown in Table 1, the fluorescent tube No. 5 has a slightly higher amount of residual mercury than other fluorescent tubes, so that the ratio of the fluorescent tube No. 5 among the waste fluorescent tubes to be processed becomes high. It has also been found that when only the fluorescent tube No. 5 is processed, it is necessary to change the residual mercury processing method.

It is a figure which shows the investigation result of the distribution state of the residual mercury in a 40 W straight tube | pipe type waste fluorescent tube. It is process drawing of the purification processing method of the fluorescent tube which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fluorescent tube 2 Airtight container 3 Opening burner 4 Cap cutting machine 5 Compressed gas injection apparatus 6 Glass tube part 7 Glass tube cutting machine 8 End part 9 Center part 10 Crusher 11 Crusher 12 Pickling apparatus 13 Pickling apparatus 14 Glass cullet 15 Insolubilized mercury 16 Base metal 17 Dust collector 18 Dust collector 19 Vacuum heating device 20 Condenser 21 Fluorescent powder 22 Mercury

Claims (4)

  Fluorescence applied to the inner surface of the glass tube by blowing a compressed gas from one end to the other end of the fluorescent tube from which the base portion has been cut and removed, or by spraying a polishing material together with the compressed gas. The mercury enclosed in the membrane and the glass tube is discharged from the glass tube, and then the glass tube is cut into at least three parts, two end parts and one central part, The fluorescent tube purification method is characterized in that it is separated into a central portion and collected.   Fluorescence applied to the inner surface of the glass tube by blowing a compressed gas from one end to the other end of the fluorescent tube from which the base portion has been cut and removed, or by spraying a polishing material together with the compressed gas. The mercury enclosed in the membrane and the glass tube is discharged from the glass tube, and then the glass tube is cut into at least three parts, two end parts and one central part, The fluorescent tube is characterized in that it is separated into a central portion and collected, and the glass tubes collected by separation are crushed separately and subjected to individual mercury removal treatment on the obtained crushed glass particle pieces. Purification treatment method.   Fluorescence applied to the inner surface of the glass tube by blowing a compressed gas from one end to the other end of the fluorescent tube from which the base portion has been cut and removed, or by spraying a polishing material together with the compressed gas. The mercury enclosed in the membrane and the glass tube is discharged from the glass tube, and then the glass tube is cut into at least three parts, two end parts and one central part, The glass tube collected separately is crushed separately, and the glass fragments obtained from the end of the glass tube are recycled as glass cullet after mercury removal treatment. And the crushed glass particle piece obtained from the center part of the glass tube is recycled as a glass cullet in a crushed state, and is a fluorescent tube purification method.   The length of the fluorescent tube is 500 mm or more, and the boundary position between the end portion and the central portion is at least 200 mm or more away from the die. The fluorescent tube purification method according to any one of the above.

Images