JP2001201724A - Method for disposing waste liquid crystal panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To quickly, cost effectively and surely sort many and diversified kinds of glass substrates taken out of liquid crystal panels by kinds. SOLUTION: This method has a first stage (S1 and S2) for taking the glass substrates out of the liquid crystal panels and a second stage (S3) for sorting the plural glass substrates obtained through the first stage by kinds of glass by a fluorescent X-ray analyzer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waste liquid crystal panel discarded in, for example, a liquid crystal panel manufacturing factory, and a waste liquid crystal discharged after dismantling an information display device or a video display device discarded in a market. The present invention relates to a method of treating a waste liquid crystal panel that treats a panel so that it can be reused.

[0002]

2. Description of the Related Art In recent years, the amount of general waste and industrial waste has increased, and the remaining years of landfills have been concerned. In addition, due to increasing environmental awareness, more environmentally friendly industrial activities are required. As a result, some governments have requested to reduce the amount of industrial waste discharged from factories and waste such as unnecessary home appliances and information devices, and to promote recycling. ing. Such a demand is the same for a liquid crystal display device and a liquid crystal panel.

At present, most defective waste liquid crystal panels discharged from liquid crystal panel manufacturing factories are buried in disposal sites. In addition, liquid crystal display devices and waste liquid crystal panels contained in waste such as home appliances and information equipment are small in amount of waste. Landfill or incineration with shredder dust containing large amounts of

[0004] On the other hand, with regard to a waste CRT which is the same display device, an appropriate recycling technique has already been proposed (for example,
Japanese Patent Application Laid-Open No. 8-267455), which is partially implemented. In this method, after the CRT glass is cut to remove the electron gun and the phosphor, the obtained glass is culled, that is, crushed, and reused as CRT glass.

[0005]

While the above-mentioned CRT and other home appliances and parts have been properly treated for recycling, such techniques have not been developed for liquid crystal panels. Not established.

Liquid crystal panels are expected to rapidly increase in production and to have a large display area in the future with the development of a highly information-oriented society because of the characteristics of being capable of power-saving driving and resource saving. Is done. Therefore, the amount of waste liquid crystal panels is also expected to increase rapidly. At present, it is almost certain that the landfill and incineration treatment that is possible due to the small volume of liquid crystal panels and the small production volume will not be possible in the future. . Therefore, there is an urgent need to develop a liquid crystal panel recycling technology.

Although it has been known that the liquid crystal material is small enough to cause little toxicity, it is difficult to decompose naturally. Therefore, the liquid crystal material must be decomposed by any method such as heating or chemical treatment. It would be desirable to do so.

Further, some liquid crystal panels use chromium metal for the purpose of preventing reflection on a color filter substrate. When this liquid crystal panel is directly landfilled, there is a voice that the chromium becomes hexavalent chromium by the reaction with the acid rain. Therefore, it is desirable to perform a recovery or stabilization process on such a liquid crystal panel. Further, it is desirable to recycle glass, which accounts for the majority of the weight of the liquid crystal panel, from the viewpoint of conserving resources.

The applicant of the present invention has previously filed an application for the invention of taking out glass (glass substrate) from a liquid crystal panel after removing organic substances (including liquid crystal) and films from the liquid crystal panel (Japanese Patent Application No. Hei 10-1998). 193307).

On the other hand, the glass used for the liquid crystal panel has more manufacturers and kinds (kinds) than those of the CRT. For this reason, in order to reuse the glass taken out of the liquid crystal panel, it is necessary to carry out a sorting process for each glass type, but the glass is taken out of the liquid crystal panel and the various kinds of glass are quickly and economically sorted. No effective method has been developed yet.

For example, Japanese Patent Application Laid-Open No. H11-197641 proposes a method of recovering glass by removing films and the like from the glass surface of a liquid crystal panel. Is treated with an abrasive in a tank, and further subjected to chemical cleaning. That is, here, no consideration has been given to sorting glass by its type.

As a method of sorting glass by product type, for example, it is conceivable to sort glass based on the product number of a liquid crystal panel (liquid crystal display device). However, it is the equipment industry that manufactures liquid crystal panels, and here, there is a situation where the operation rate of the factory must be increased in order to reduce the manufacturing cost. For this reason, the liquid crystal panel may be manufactured on a plurality of manufacturing lines. In this case, it is not possible to reliably sort the glass based on the product number.
For this reason, it is desired to realize a technique for sorting glass from various types of glass collected from the market, including various types of glass, in a short time, economically, and reliably.

[0013]

In order to solve the above-mentioned problems, a method for treating a waste liquid crystal panel according to the present invention is obtained through a first step of taking out a glass substrate from a liquid crystal panel and a first step. A second step of selecting a plurality of glass substrates by glass type using a fluorescent X-ray analyzer.

According to the above configuration, the glass substrate is taken out of the liquid crystal panel in the first step, and the glass substrate is sorted by the type of glass by the fluorescent X-ray analyzer in the second step.

An X-ray fluorescence analyzer can measure which elements are contained in a glass substrate in which ratio. Therefore, for example, by examining the composition of each type of glass in advance, and comparing those values with the measured values of each glass substrate, each glass substrate can be sorted out by type. In this case, since the glass used for the glass substrate of the liquid crystal panel has a known composition for each type of glass, this sorting can be easily performed.

Therefore, according to the processing method of the present invention,
A wide variety of glass substrates taken out of a liquid crystal panel can be sorted in a short time, economically and reliably by type.

In the above method for treating a waste liquid crystal panel,
The second step may be configured to sort each glass substrate based on some elements contained in the glass substrate.

According to the above configuration, it is possible to sort the various glass substrates taken out of the liquid crystal panel by type in a shorter time.

That is, the composition of each type of glass substrate is known in advance. Therefore, it is possible to sort the glass substrates by type by measuring only a part of the composition of the glass substrate and comparing the composition with a reference value prepared in advance.

The method for treating a waste liquid crystal panel described above may be configured such that the glass substrate selected in the second step is pulverized and reused as a glass material.

According to the above configuration, when the glass substrate is pulverized into cullet, the space required for storing, transporting and reprocessing the glass can be reduced, and the storage and transport become easy. The cullet can be used as a material for a glass substrate of a liquid crystal panel or another glass material.

In the method for treating a waste liquid crystal panel described above,
In the first step, the liquid crystal panel is cut off from oxygen.
It may be configured to include a step of heating in an atmosphere of up to 650 ° C. to gasify and remove organic substances.

According to the above configuration, the liquid crystal panel is heated in an atmosphere of 450 to 650 ° C. in which oxygen is cut off to gasify and remove organic substances, so that deformation and cracking of the glass substrate can be suppressed. This process can be performed. In this way, by processing to suppress cracking and deformation of the glass substrate,
In the process of sorting glass substrates by a fluorescent X-ray analyzer,
It is possible to prevent a situation in which measurement by the fluorescent X-ray analyzer becomes difficult due to deformation of the glass substrate, and a situation in which the number of measurements by the fluorescent X-ray analyzer increases due to breakage of the glass substrate.

In the above method for treating a waste liquid crystal panel,
The first step may be configured to include a step of removing a film provided on the glass substrate by a mechanical film removal method as a post-step of the step of gasifying and removing an organic substance. Good.

According to the above configuration, the film remaining on the glass substrate in the step of gasifying and removing the organic matter can be reliably removed. Thereby, in the second step, the glass substrate can be appropriately sorted by the X-ray fluorescence analyzer.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. FIG. 2 shows an example of a vertical cross-sectional view of a liquid crystal panel serving as a waste liquid crystal panel. This liquid crystal panel is a waste liquid crystal panel that is discharged from a liquid crystal panel manufacturing plant, a liquid crystal display device assembly plant or a product maker, or a waste liquid crystal that is discharged after dismantling information display devices and video display devices that are disposed of in the market. It is a panel. The liquid crystal panel shown in FIG. 2 is an active liquid crystal panel such as a TFT liquid crystal panel. Note that the active elements are omitted in FIG. Further, the method of the present invention is similarly applicable to a duty liquid crystal panel.

As shown in FIG. 2, the liquid crystal panel has two glass substrates 1.1 opposed to each other. These glass substrates 1 and 1 are bonded together between their inner surfaces by a sealing resin body 2 provided along their peripheral edges. Liquid crystal is filled in a region sealed by the glass substrates 1 and the sealing resin body 2 to form a liquid crystal layer 3. A polarizing plate 4 is adhered to the outer surface of each glass substrate 1 with an adhesive.

On the inner surface of one glass substrate 1, a color filter 5, an antireflection film 6, a transparent electrode 7, and an alignment film 8 are formed. The color filter 5 is made of a material mainly composed of an organic substance. The antireflection film 6 is made of metal chromium or the like. The transparent electrode 7 is made of a film containing indium or the like.
The alignment film 8 is made of an organic material.

On the inner surface of the other glass substrate 1, a pixel electrode 9, a bus electrode 10, and an alignment film 8 are formed. The pixel electrode 9 is made of a transparent film containing indium or the like. The bus electrode 10 is made of a metal film such as tantalum, aluminum or titanium.

Next, a method of treating a waste liquid crystal panel for recycling when the above liquid crystal panel is a waste liquid crystal panel will be described below.

In the method of processing a liquid crystal panel, as shown in FIG. 1, first, a heat treatment (medium-temperature dry distillation) is performed on the liquid crystal panel in order to remove organic substances of the liquid crystal panel (S).
1). Next, a thin film, for example, a metal film remaining on the glass substrate 1 after the heat treatment is removed by a mechanical method (S2). Next, the glass substrate 1 was measured using a fluorescent X-ray analyzer.
Is sorted by product type (S3), and then the glass substrate 1 is crushed (S4).

The heat treatment in step S1 is performed by placing the liquid crystal panel with the polarizing plate 4 attached in a furnace and in an atmosphere in which oxygen is cut off or in an atmosphere in which nitrogen gas is introduced. In order to check the proper heating conditions at this time, the heat treatment was performed in the range of 400 to 700 ° C. Table 1 shows the results.

[0033]

[Table 1]

As shown in Table 1, in this heat treatment, good results were obtained when the treatment temperature was in the range of 450 to 650 ° C. On the other hand, when the processing temperature was lower than 450 ° C., part of the polarizing plate 4 and the color filter 5 remained without being gasified. In this case, post-processing for removing the polarizing plate 4 and the color filter 5 is difficult. When the processing temperature was higher than 650 ° C., the warpage and deformation of the glass substrate 1 increased. In this case, it is difficult to perform a post-treatment for removing the film by a physical method (mechanical method). The liquid crystal of the liquid crystal layer 3 has a temperature of 250 to 300 ° C.
The above heating for about 30 minutes completely removed the gasified gas.

The rate of temperature rise and fall of the liquid crystal panel is 4
When the temperature exceeds 0 ° C./min, the frequency of cracking of the glass substrate 1 increases, and as a result, it has been found that the separation treatment of the glass substrate 1 and the post-treatment for removing the thin film become complicated.

In consideration of the processing time and the deformation and cracking of the glass substrate 1, the heat treatment conditions for the liquid crystal panel are more desirably at a processing temperature of 500 to 650 ° C. and a heating rate of 35 ° C.
/ Min or less, and the temperature decreasing rate is 25 ° C / min or less.

Here, the liquid crystal panel is arranged horizontally in the furnace. However, if the amount to be processed at a time is large, it is better to arrange the liquid crystal panel upright to improve the outgassing.
Further, it is desirable because the warpage of the glass substrate 1 is reduced.

The heat treatment can be performed after the polarizing plate 4 is peeled off from the liquid crystal panel. However, the adhesive used for attaching the polarizing plate 4 has such an adhesive strength that the polarizing plate 4 is not easily peeled off even when immersed in liquid nitrogen. Therefore, the polarizing plate 4 is peeled off by hand or the like. In this case, the liquid crystal panel is desirably subjected to a heat treatment with the polarizing plate 4 attached, since the glass substrate 1 may be broken, which is dangerous.

The organic gas generated in the heat treatment may be led to a separately provided secondary combustion chamber and incinerated with a commercially available fuel gas. However, as shown in FIG. 1, the organic gas can be thermally recycled, for example, by using it for power generation in a cogeneration system.

Although the heat treatment was performed in an atmosphere in which oxygen was cut off in this case, the temperature in the carbonization chamber was not excessively increased due to continuous burning of organic substances such as the polarizing plate 4 and liquid crystal.
That is, as long as the warpage of the glass substrate 1 does not increase or the glass substrate 1 does not break, it is easily understood that some air may flow into the dry distillation chamber.

Further, a small amount of carbide may remain on the surface of the liquid crystal panel, but can be easily removed by immersion in a mixed solution of concentrated sulfuric acid and hydrogen peroxide, and this treatment can be performed if necessary. More desirable.

In the process of removing the thin film of S2, mainly the metal film or metal oxide film remaining on the surface of the glass substrate 1 after the heat treatment of S1 is removed. In the liquid crystal panel of FIG. 2, those corresponding to these films are an antireflection film 6, a transparent electrode 7, a pixel electrode 9, and a bus electrode 10. However, here, even the organic film remaining with the metal film without undergoing the heat treatment of S1 can be removed. Further, although the removal of the organic film can be performed by a chemical method using a conventionally known etching method, in this case, the equipment becomes large and the waste liquid needs to be treated. Therefore, S
The mechanical processing (physical processing) method 2 has smaller processing equipment and lower processing cost than the chemical method.

For the thin film removing process, each of the film removing apparatuses 21, 31, 41 and 51 shown in FIGS. 3 to 6 can be used.

The film removing apparatus 21 shown in FIG. 3 has the same configuration as a commercially available deburring apparatus. That is, the film removing device 21
The belt-shaped sandpaper 23 is rotated in the direction of arrow A by a pair of cylindrical rollers 22. Roller 22
Are rotationally driven by a motor (not shown).
A support table 24 is provided between the reference numerals 22.

In the film removing process, the glass substrate 1 is arranged so that the film 1a remaining on the glass substrate 1 faces the sandpaper 23, and the glass substrate 1 is moved in the direction B to Is pressed against the sandpaper 23 rotating in the direction A. Thereby, the film 1a is polished and removed.

The film 1a is formed on one glass substrate 1
And the pixel electrode 9 and the bus electrode 10 remaining on the other glass substrate 1.

The polishing with the sandpaper 23 includes a wet method in which a small amount of water is supplied onto the sandpaper 23 for grinding, and a dry method in which water is not supplied, and any method can be used. The wet method has the advantage that the scattering of polishing debris generated by polishing is reduced, the heating is suppressed, the wear of the abrasive is reduced, and the usable time of the sandpaper 23 is prolonged. On the other hand, in the wet method, the polishing debris is settled or suspended in water, and it is necessary to dry it when it is collected. In order to reduce this time or to omit the step of removing water from the polishing waste collecting step, it is desirable to minimize the supply amount of the water.

The size of the sandpaper 23 is selected from the processing time and the ease of recycling of the polishing waste.
A number from about 0 to 1200 is suitable. If the number is small, the processing time is shortened and the polishing efficiency is increased, but the mixing ratio of glass powder is increased, and the recovery efficiency of indium, chromium, and other metals such as aluminum, titanium, and tantalum is reduced. On the other hand, if the number is large, the polishing time is prolonged because the abrasive grains are fine, but there is an advantage that the metal content in the polishing waste can be increased by controlling the polishing amount. In addition, the rotation speed of the sandpaper 23 is preferably set to be lower than that in the case of ordinary mere polishing work in order to reduce the scattering amount of the polishing debris and increase the collection rate.

The film removing device 31 shown in FIG. 4 is a commercially available rotary polishing device. In this film removing device 31, a relatively coarse polishing sheet 33 is attached to the upper surface of a turntable 32 that rotates in the direction of arrow C. In removing the film, the glass substrate 1 is arranged so that the film 1a faces the polishing sheet 33, and the glass substrate 1 is moved in the direction B and pressed against the polishing sheet 33 rotating in the direction C. Thus, the film 1a is polished and removed from the glass substrate 1. At this time, the glass substrate 1 is moved in a direction parallel to the rotation surface of the polishing sheet 33, for example, D
By reciprocating in the direction E, the film 1a can be more uniformly removed.

In this polishing method, the above-mentioned dry method and wet method can be adopted, and the respective advantages and precautions are the same as described above.

The film removing device 41 shown in FIG. 5 is a commercially available glass digging device. The film removing device 41 has a diameter of 1
A grindstone 4 obtained by mixing diamond particles and ceramic powder and sintering the outer periphery of a stainless steel rotating rod 42 of about 0 mm
3 is provided. The rotating rod 42 rotates in the F direction.

When removing the film, the rotating grindstone 43 and the film 1 are removed.
a so as to be in contact with the glass substrate 1.
Are moved in parallel (movement in the A direction). Thereby, the film 1a
Is polished and removed from the glass substrate 1.

In this polishing method, the above-mentioned dry method and wet method can be adopted, and the advantages and precautions thereof are the same as those described above.

The film removing device 51 shown in FIG. 6 is a commercially available sandblasting device. The film removing device 51 includes a blast gun 52 for emitting fine particles 53 of sand.

When the film is removed, the fine particles 53 vigorously emitted from the blast gun 52 in the G direction collide with the glass substrate 1 while moving the glass substrate 1 in the A direction.
Thus, the film 1a is polished and removed from the glass substrate 1.

In the above-mentioned method, since the polishing waste of the obtained film 1a contains metal components such as indium and chromium in relatively high purity and the above-mentioned polishing waste can be economically recovered, material recycling is possible. Becomes

In the sorting process of the glass type in S3, the glass substrate 1 that has become only glass after the process of S2 is selected.
Are sorted by glass type using a fluorescent X-ray analyzer.

Each glass substrate 1 which has been subjected to the processing of S2 has a composition which is not different from that of the original glass, and the composition is different depending on the glass maker or the glass type. Therefore, the glass substrate 1 is replaced with, for example, the glass substrate 1.
In order to use them as a material for glass, it is necessary to sort them by glass type. Also, even when used as a general glass material, it may be necessary to sort to some extent by glass type.

Table 2 shows the glass substrate 1 of the liquid crystal panel.
1 shows a chemical composition of a typical glass used in the above method. In the table,
Glass type S is soda glass. This can be easily determined by using a fluorescent X-ray analyzer because it contains the element K. Glass types A to E are non-alkali glass called aluminoborosilicate glass mainly used for TFT liquid crystal panels. This glass is made of SiO ₂ , Al ₂ O
₃ , B ₂ O ₃ and BaO as main components.

[0060]

[Table 2]

FIG. 7 is a sectional view of a main part of a general energy dispersive X-ray fluorescence analyzer. The X-ray fluorescence analyzer includes a wavelength dispersion type and an energy dispersion type, and both can be used. Here, an inexpensive energy dispersion type will be described as an example.

As shown in FIG. 7, a fluorescent X-ray analyzer 61
Has a measurement chamber 64 sealed by a table 62 and an openable / closable bell jar 63. A measuring table (not shown) on which an object to be measured is placed, an X-ray tube 6
5 and an X-ray fluorescence sensor 66 are provided. Further, a vacuum pump 67 is attached to reduce the pressure in the measurement chamber 64 to increase the measurement accuracy.

When the glass substrate 1 is placed on the measuring table and the X-ray tube 65 is turned on, the glass substrate 1 is irradiated with soft X-rays traveling in the direction of arrow A, and is contained in each glass substrate 1. Fluorescent X-rays having energy peculiar to the element are irradiated in the B direction. By counting the fluorescent X-rays for each energy by the fluorescent X-ray sensor 66, it is possible to measure which elements are contained in the glass substrate 1 and in what proportion. Therefore, for example, by examining the composition of each glass type in advance and comparing those values with the measured values of each glass substrate 1, each glass substrate 1 can be sorted out by type. In this case, the selection of the glass used for the glass substrate 1 of the liquid crystal panel is easy because the composition of each glass type is known. Also,
This sorting can be performed only by comparing some elements due to the characteristics of the glass type.

In general, elements O and B cannot be measured by an energy dispersive X-ray fluorescence spectrometer, and these are designated as residual components. Even in this case, the composition is SiO ₂ , Al ₂ O ₃ , BaO, CaO, SrO,
It is clear from Table 2 that the glass substrate 1 can be easily selected if MgO and As ₂ O ₃ can be measured.

It should be noted that the glass types B and E have almost the same composition, and it is difficult to sort them. However, conversely, if the compositions are the same so far, it can be said that there is no problem in reusing as a glass material even if both cannot be sorted out.

In the analysis of the glass composition using the fluorescent X-ray analyzer 61, although the measurement error increases, the type of the glass substrate 1 to be measured is limited, and the composition of each glass type is known in advance. There is no practical problem. In addition, since the composition of each glass type is known in advance, the glass substrate 1 can be sorted out by analyzing a part of the composition as described above.

In the selection of the glass substrate 1 by the composition analysis using the fluorescent X-ray analyzer 61, a medium temperature carbonization step (S
It is also possible to check whether the processing in 1) and the thin film removing step (S2) has been surely performed. Therefore, this can be utilized for process control.

Further, in the present waste liquid crystal panel processing method, the bending deformation and cracking of the glass substrate 1 are minimized through the processing from the intermediate temperature dry distillation step (S1) to the thin film removing step (S2). Therefore, sorting of the glass substrate 1 by the fluorescent X-ray analyzer 61 is facilitated. That is,
If the glass substrate 1 is crushed before performing the sorting using the X-ray fluorescence analyzer 61, the number of measurements by the X-ray fluorescence analyzer 61 increases, the measurement time becomes longer, and the sorting operation itself becomes difficult. Become.

The apparatus for sorting glass substrates 1 using the fluorescent X-ray analyzer 61 adds a simple load / unload mechanism (loader / unloader) and a positioning mechanism to the commercially available fluorescent X-ray analyzer 61. Thereby, automation can be easily performed.

In the pulverizing process in S4, the glass substrate 1 that has been subjected to the sorting process in S3 is pulverized into cullet. The glass substrate 1 to be treated here is in a state where films such as an organic film and a metal film are removed and is sorted by glass type, and each has a composition that is not different from the original glass. . Therefore, the cullet can be used again as a liquid crystal glass material by mixing it with a liquid crystal glass raw material. In this case, the cullet is melted in a melting furnace together with the liquid crystal glass raw material.

When the glass substrate 1 is formed as a cullet as described above, the space required for storing, transporting and reprocessing the glass can be reduced, and the storage and transport can be facilitated.

As described above, in the method for treating a waste liquid crystal panel according to the present embodiment, the liquid crystal panel having a polarizing plate is placed in an atmosphere of 450 to 650 ° C. and heated to thereby prevent the deformation of the glass substrate 1. Organic substances such as a polarizing plate and a liquid crystal are gasified and removed without causing cracks. At this time,
After the liquid crystal is gasified, it is decomposed by combustion. Therefore, there is no need to mechanically peel off and remove the polarizing plate, and organic substances including the polarizing plate can be easily and inexpensively removed. In addition, the generated gas can be thermally recycled and is economical.

The film remaining on the glass substrate 1 is removed by a mechanical film removing method, for example, grinding or polishing. Therefore, cracking of the glass substrate 1 hardly occurs. Further, the content of a film material, for example, a metal material in a film removal waste such as grinding waste or polishing waste is high, and a metal such as chromium can be recovered and regenerated, which is safe from the viewpoint of environmental impact. And material recycling becomes possible economically, and resource saving can be promoted.

As described above, since the glass substrate 1 is taken out of the liquid crystal panel through a process that hardly causes deformation or cracking, the process of sorting the glass substrate 1 by the X-ray fluorescence analyzer 61 is easy.

Then, since the metal film and the glass can be reused, the waste liquid crystal panel is almost closed, and ideal recycling with little waste is possible.

[0076]

As described above, according to the method for treating a waste liquid crystal panel of the present invention, the first method for removing a glass substrate from a liquid crystal panel is described.
And a second step of selecting a plurality of glass substrates obtained through the first step by glass type using a fluorescent X-ray analyzer.

According to the above configuration, the fluorescent X-ray analyzer can measure which element is contained in the glass substrate in which ratio. Therefore, for example, by examining the composition of each type of glass in advance, and comparing those values with the measured values of each glass substrate, each glass substrate can be sorted out by type. In this case, the selection of the glass used for the glass substrate of the liquid crystal panel is easy because the composition of each type of glass is known.

Therefore, according to the processing method of the present invention,
A wide variety of glass substrates taken out of a liquid crystal panel can be sorted in a short time, economically and reliably by type.

In the method for treating a waste liquid crystal panel described above,
The second step may be configured to sort each glass substrate based on some elements contained in the glass substrate.

According to the above configuration, it is possible to sort out various types of glass substrates taken out of the liquid crystal panel in a shorter time.

That is, the composition of each type of glass substrate is known in advance. Therefore, it is possible to sort the glass substrates by type by measuring only a part of the composition of the glass substrate and comparing the composition with a reference value prepared in advance.

The above-mentioned method for treating a waste liquid crystal panel may be configured such that the glass substrate selected in the second step is pulverized and reused as a glass material.

According to the above arrangement, when the glass substrate is pulverized into cullet, the space required for storage, transportation and reprocessing of the glass can be reduced, and storage and transportation can be facilitated. The cullet can be used as a material for a glass substrate of a liquid crystal panel or another glass material.

In the method for treating a waste liquid crystal panel described above,
In the first step, the liquid crystal panel is cut off from oxygen.
It may be configured to include a step of heating in an atmosphere of up to 650 ° C. to gasify and remove organic substances.

According to the above structure, the liquid crystal panel is heated in an atmosphere of 450 to 650 ° C. in which oxygen is cut off to gasify and remove organic substances, so that deformation and cracking of the glass substrate can be suppressed, This process can be performed. In this way, by processing to suppress cracking and deformation of the glass substrate,
In the process of sorting glass substrates by a fluorescent X-ray analyzer,
It is possible to prevent a situation in which measurement by the fluorescent X-ray analyzer becomes difficult due to deformation of the glass substrate, and a situation in which the number of measurements by the fluorescent X-ray analyzer increases due to breakage of the glass substrate.

In the method for treating a waste liquid crystal panel described above,
The first step may be configured to include a step of removing a film provided on the glass substrate by a mechanical film removal method as a post-step of the step of gasifying and removing an organic substance. Good.

According to the above configuration, the film remaining on the glass substrate in the step of gasifying and removing the organic matter can be reliably removed. Thereby, in the second step, the glass substrate can be appropriately sorted by the X-ray fluorescence analyzer.

[Brief description of the drawings]

FIG. 1 is a flowchart illustrating a method for processing a waste liquid crystal panel according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing a liquid crystal panel processed by the processing method shown in FIG.

FIG. 3 is a schematic front view showing an example in which the film removing process shown in FIG. 1 is performed by a deburring device as a film removing device.

FIG. 4 is a schematic front view showing an example in which the film removal processing shown in FIG. 1 is performed by a rotary polishing apparatus as a film removal apparatus.

FIG. 5 is a schematic front view showing an example in which the film removing process shown in FIG. 1 is performed by a glass digging device as a film removing device.

FIG. 6 is a schematic front view showing an example in which the film removal processing shown in FIG. 1 is performed by a sand blast device as a film removal device.

FIG. 7 is a schematic longitudinal sectional view of the X-ray fluorescence analyzer for performing the glass type sorting process shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Glass substrate 1a film 2 Seal resin body 3 Liquid crystal layer 4 Polarizer 5 Color filter 6 Anti-reflection film 7 Transparent electrode 8 Alignment film 9 Pixel electrode 10 Bus electrode 21 Film removing device 23 Sandpaper 31 Film removing device 33 Polishing sheet 41 Film Removal device 43 Grinding stone 51 Film removal device 53 Fine particles 61 X-ray fluorescence analyzer

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2H088 FA11 HA02 MA20 2H090 JB02 JC18 JC20 LA01 4D004 AA24 CA04 CA07 CA27 CB13 CC01 DA02 DA03 DA06

Claims (5)

[Claims] 1. A first method for removing a glass substrate from a liquid crystal panel.
And a second step of selecting a plurality of glass substrates obtained through the first step by a type of glass using a fluorescent X-ray analyzer. 2. The method for treating a waste liquid crystal panel according to claim 1, wherein in the second step, each glass substrate is sorted based on a part of elements contained in the glass substrate. 3. A method for treating a waste liquid crystal panel, wherein the glass substrate selected in the second step is crushed and reused as a glass material. 4. The method according to claim 1, wherein the first step includes a step of heating the liquid crystal panel in an atmosphere of 450 to 650 ° C. with oxygen cut off to gasify and remove organic substances. 3. The method for treating a waste liquid crystal panel according to item 1. 5. The first step includes a step of removing a film provided on the glass substrate by a mechanical film removing method as a step subsequent to the step of gasifying and removing an organic substance. The method for treating a waste liquid crystal panel according to claim 4, wherein: