JPS6150688A - Recovery of fluorescent paint from scrapped household electric product - Google Patents

Abstract

PURPOSE:To recover a fluorescent paint with good efficiency, by washing the surfaces of fluorescent paint coated parts obtained by roughly disassembling and sorting a waste household electric product or coarsely crushing said parts to release a fluorescent substance and screening said fluorescent substance to concentrate the same. CONSTITUTION:Washing water containing the fluorescent substance obtained from a washing process 12 is separated from a precipitate 16 by concn. treatment such as centrifugal separation and filtering and the precipitate 16 is subjected to dehydration treatment 17 to obtain a fluorescent substance 18. Glass pieces treated by a coarsely crushing process is treated with a wet releasing apparatus such as a release mill or an ultrasonic washing apparatus and the fluorescent substance 18 is released in water in a release process 19. Therefore, glass pieces are obtained on a screen and the fluorescent substance slurry can be obtained under the screen in a screening process 20. This slurry is subjected to concn. treatment 15 and similarly treated on and after to obtain the fluorescent substance 18.

Description

DETAILED DESCRIPTION OF THE INVENTION <Field of Application in Industry> The present invention relates to a method for efficiently recovering fluorescent materials used in waste home appliances in order to utilize the materials. .

<Conventional technology> The number of discarded home appliances is increasing with the development of industry. Conventionally, the collection of discarded home appliances has mainly focused on iron and other materials. Although parts are expensive and reusable, they are incinerated or disposed of in landfills.
The difficulty in disposing of this waste contributed to garbage pollution. On the other hand, resource shortages have become a social problem in recent years, and although various studies have been conducted on recycling parts of discarded home appliances, no efforts have been made to recover fluorescent substances. For this reason, the current situation is that fluorescent material-coated glass is still discarded as it cannot be reused.

The present invention efficiently recovers fluorescent paint from parts coated with fluorescent paint, such as cathode ray tube fluorescent lamp tubes in discarded home appliances, and also recovers fluorescent paint from parts coated with fluorescent paint. The aim was to improve the quality of the recycled glass, making it possible to reuse it.

So, does the present invention perform physical treatments such as cleaning and rubbing when recovering fluorescent substances from waste home appliances? ), and it is a junk item.1.・Roughly disassemble waste home appliances such as vinyl cathode ray tubes and fluorescent light tubes, select parts coated with fluorescent paint, and wash the surfaces of the parts, or after crushing the parts and peeling off the fluorescent substance τf. It is characterized by being sieved and then concentrated.

<Examples> Hereinafter, the present invention will be described in more detail with reference to Examples.

In this example, a TV/Vis cathode ray tube will be explained, but electrolytic tubes such as fluorescent lamps and mercury lamps may also be used.

The present invention can be similarly applied to other products such as on-board electronic computers, automobile panels, and X-ray intensifying screens.

Figure 1 shows an example of a cathode ray tube 1 obtained from a scrap TV. :The electron gun 4, the panel glass 2, and the nonel glass 77 are attached to the joint part of the glass. , fluorescent paint 71. tf11 The back surface of the panel glass 2 is coated with 3. Therefore, it is necessary to take out the panel glass 2, which is a part coated with fluorescent paint, from the cathode ray tube 1 by rough disassembly. This rough disassembly is performed by crushing the 7-anonel glass 3 with a hammer or the like to remove the electron gun 4 and shadow mask 5, and then removing the panel glass 2 from the metal frame 6. Then, the panel glass 2 taken out is processed according to the process order shown in the second figure to recover the fluorescent material. That is, in FIG. 2, the panel glass that has been sorted with the fluorescent paint still applied through the rough decomposition 11 is cleaned by scrubbing the surface coated with the fluorescent paint with a cleaning tool such as a brush, and removing the fluorescent substance together with the cleaning water. Lower F! 12 or a coarse crushing step 13 in which the glass is crushed into small pieces of glass.

The washing water 14 containing the fluorescent substance obtained in the washing step 12 is then subjected to #sound treatment 15 such as centrifugation and filtration.
The precipitate 16 is separated from the precipitate 16, and the precipitate 16 is subjected to dehydration treatment such as centrifugation and drying [7] to obtain the fluorescent substance 18.

On the other hand, the glass pieces treated in the above-mentioned crushing step 13 are treated with nitrogen in a wet peeling device such as Peeling Mino 1 or an ultrasonic cleaning device, and the fluorescent substance is peeled off 19 in water. Therefore, by sieving 20, glass pieces can be obtained on the sieve and a fluorescent substance solution can be obtained under the sieve, and this solution can be used in the # shrinking treatment 1.
5, and thereafter, a fluorescent material 18 is obtained by performing the same treatment. Here, a fluorescent material can be obtained through both of the washing step 1 12 and the crushing step 13, but its quality is not high purity as shown in Table 1 below, and if it is necessary to increase the purity. If necessary, acid treatment may be performed to extract the fluorescent rare earth substances, or if it can be used in low purity (well, it is reused as is.In any case, the fluorescent paint is applied The recovery rate from parts such as glass is high, and therefore it is possible to improve the quality of these parts.

Table 1 <Effects of the Invention> According to the present invention described above, fluorescent substances can be recovered from waste household electrical appliances, their reuse becomes possible, and recovery is carried out with good yield. In addition, since impurities are removed from parts such as glass that have been coated with fluorescent substances and recovered, the quality of the glass can be improved.

[Brief explanation of drawings]

FIG. 1 is a side view of a cathode ray tube, which is a discarded home appliance, and FIG. 2 is a block diagram showing the process. 1 CRT, 2 Panel glass, Funnel glass, 4 Electron gun, 5 Shadow mask 6 Mounted with metal frame

Claims (1)

[Claims] After roughly disassembling discarded home appliances such as cathode ray tubes of discarded televisions and fluorescent light tubes and sorting out the parts coated with fluorescent paint, cleaning the surfaces of the parts, or crushing the parts and peeling off the fluorescent material. A method for recovering fluorescent paint from waste home appliances, which comprises sieving and then concentrating.