JPH0823534B2 - Method for identifying impurities in recycled crushed glass - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a method for identifying impurities incorporated in recycled crushed glass, especially crushed glass.

[Prior Art] Currently, used glass products such as glass bottles are crushed by a crusher and reused as raw materials for glass production.

Usually, crushed glass is divided into powder, 5 mm, 10 mm, 20 mm, etc., and handled as a recycled raw material, and they are mixed and used at the time of glass production.

Also, in crushing the used glass products etc.,
I try to remove metal or other large contaminants using a Kinoku detector, etc. However, in the crushed crushed glass, ceramics (setomono),
Impurities such as stones, wood chips, paper, and resin are mixed in.

It is required that these impurities be kept in an amount of about 0.05% or less as a raw material for crushed glass. Therefore, conventionally, crushed glass obtained by removing powdery substances from the crushed glass (5 mm or more) While sending the
Workers are working to visually pick up impurities.

[Problems to be Solved by the Invention] However, in the above-mentioned conventional method, it is very difficult to find impurities from a state in which coarsely crushed glasses having various colors are mixed, and it is often overlooked. Since the proportion of impurities exceeds the required value, great care must be taken, and the fatigue of the workers has become a great deal. Further, there is a problem that a specialized worker is required to separate such impurities and that the work speed for removing the impurities is limited due to visual inspection, resulting in low work efficiency and high cost. It was

An object of the present invention is to make it possible to easily and surely identify the impurities mixed in the crushed glass and to easily separate and remove the impurities.

[Means for Solving the Problems] The present invention is intended to solve the above technical problem, and the coarsely crushed glass obtained by crushing is brought into contact with a water-washable fluorescent penetrant to cause adhesion and permeation. After washing, wash off the fluorescent penetrant adhering to the surface of the crushed glass by washing with water, and then after drying, irradiate the crushed glass with ultraviolet rays, and the fluorescent penetrant penetrating the impurities emits fluorescence. The present invention relates to a method for identifying impurities in recycled crushed glass, which is characterized by identifying impurities.

[Operation] Therefore, in the present invention, when the roughly crushed glass is brought into contact with the water-washable fluorescent penetrant and then rinsed with water, the roughly crushed glass is immediately washed off because the fluorescent penetrant does not penetrate, Since the fluorescent penetrant has permeated, it remains even after washing with water, and therefore, only the impurities emit fluorescence when irradiated with ultraviolet rays, so that the impurities can be easily and surely identified.

[Examples] Examples of the present invention will be described below with reference to the drawings.

FIG. 1 shows an example of an apparatus for carrying out the method of the present invention. A crushed glass 1 from which powder has been removed after crushing is introduced into a permeation tank 3 through a carry-in conveyor 2 from an inlet port 4 at one end. To do.

The permeation tank 3 has a rotary tank 6 rotatably supported by rollers 5, and a water-washable fluorescent permeation liquid 7 is supplied to the inside of the rotary tank 6 and introduced through the introduction port 4. The crushed glass 1 is provided with a spiral blade 9 that acts so as to move the crushed glass 1 while stirring it in the permeate 7 and draw it out from the outlet 8 at the other end.

The roughly crushed glass 1 derived from the permeation tank 3 is introduced into the cleaning tank 11 by the delivery conveyor 10 from the one-end introduction port 12.

The cleaning tank 11 has a mesh-type rotary tank 14 rotatably supported by rollers 13, and inside the rotary tank 14, the roughly crushed glass 1 introduced from the inlet 12 is stirred by rotation. It has a spiral blade 16 which is moved to be led out from the outlet port 15 at the other end, and is inserted into the axial center portion from the end portion to 2-3 kg / cm of the crushed glass 1 in the agitated state. ^It has a water spray nozzle 17 for spraying about ² jets of water to wash the penetrant liquid adhering to the surface of the crushed glass, and a water receiving tank 18 surrounding the lower part of the rotary tank 14 for receiving the cleaning liquid. ing.

The roughly crushed glass 1 derived from the cleaning tank 11 is dried in a drying tank.
It is introduced into the inside 19 through the inlet 20 once.

The drying tank 19 has a mesh-type rotating tank 22 rotatably supported by rollers 21, and inside the rotating tank 22, the crushed glass 1 introduced from the inlet 20 is stirred by rotation. It has a spiral blade 24 that moves so as to be led out from the outlet port 23 at the other end, and introduces hot air 25 of 70 to 90 ° C. from the other end outlet port 23 part to coarsely crush in the agitated state. Air tube 26 for drying glass 1
Is provided.

The crushed glass 1 drawn out from the drying tank 19 is conveyed by a conveyor 27 into the ultraviolet irradiation chamber (dark chamber) 28.

In the ultraviolet irradiation chamber 28, an appropriate number of ultraviolet irradiation lamps 29 for irradiating the crushed glass 1 on the conveyor 27 with ultraviolet rays having a wavelength of 330 to 390 nm are provided.

As described above, the crushed glass 1 is fed while first stirring the fluorescent permeating liquid 7 in the permeation tank 3. At this time,
Fluorescent penetrant adheres to the surface of the crushed glass 1 but does not permeate it. On the other hand, it is porous (porous) and has irregular irregularities or scratches on the surface like impurities such as ceramics and stones. The fluorescent penetrant penetrates into the one that has.

Therefore, if the fluorescent penetrant liquid adhering to the surface of the crushed glass 1 is washed off when the cleaning pen 11 is subsequently guided to the cleaning tank 11, the fluorescent penetrant liquid that has permeated the impurities remains as it is.

Therefore, when the roughly crushed glass 1 that has been dried in the drying tank 19 is introduced into the ultraviolet irradiation chamber 28 and irradiated with ultraviolet light having a wavelength of 330 to 390 nm by the ultraviolet irradiation lamp 29, the fluorescent penetrant liquid that has permeated the impurities is 500 nm. Emits fluorescence.

Therefore, the impurities can be easily identified immediately. Therefore, even if the worker removes impurities as in the conventional case, the selecting work can be performed easily and efficiently. At this time, the wavelength of the ultraviolet rays to be irradiated is 330 to 3
By using a 90 nm wavelength, there is no effect on the human body.

Further, it is possible to automatically sort impurities that emit fluorescence by the irradiation of the ultraviolet rays by utilizing the fluorescence.

FIGS. 2 and 3 show an example of an impurity selecting device 30 embodying the same, in which the crushed glass 1 conveyed by the conveyer conveyor 27 and irradiated with ultraviolet rays is provided with a guide plate 31 to form a substantially single line. The fluorescent brightness sensor 32 for detecting the fluorescence emitted by the roughly crushed glass 1 is provided on the upper part of the roughly crushed glass 1 and the valve 33 is opened / closed at right angles to the conveyor 27. An air gun 34 that ejects compressed air from one side is provided, and a control device 35 that opens and closes the valve 33 according to a detection signal from the fluorescent brightness sensor 32 is further provided. An impurity receiver 36 is provided on the opposite side. 37 indicates a roughly crushed glass receiver, 38 indicates an impurity.

In the above, when the impurities 38 are present in the crushed glass 1 sent in a row by the guide plate 31, the fluorescence brightness sensor 32 immediately detects it and the valve 33 is turned on when the impurities 38 come in front of the air gun 34. The control device 35 acts to open. As a result, the impurities 38 are blown off by the compressed air and enter the impurity receiver 36 on the opposite side.

At this time, impurities 38 are generated due to, for example, the range of air sprayed by the air gun 34 and the disorder of the row of the crushed glass 1 that is moving.
The crushed glass 1 may also be taken out to the impurity receiver 36 together with this, but since the absolute amount taken out to the impurity receiver 36 is small, the operator manually selects this and collects the crushed glass 1. It's easy to do. Further, by carrying out the movement of the roughly crushed glass 1 in a line, it is possible to surely separate only the impurities. In addition, the nozzle gun 34 is provided directly below the fluorescent brightness sensor 32 to provide the fluorescent brightness sensor 32.
It is also possible to open the valve 33 and remove the impurities at the same time when the impurities 38 are detected by.

FIG. 4 shows another example of the impurity selection device 30. A fluorescence brightness sensor 32 and an air gun 34 are provided in the middle of the falling of the crushed glass 1 falling from the end of the conveyor 27, and impurities 38 are contained in the middle of the falling. Is detected and separated.

FIG. 5 shows still another example of the impurity selection device 30, which is provided with a guide plate 39 for guiding the crushed glass 1 so as to move the crushed glass 1 in a row, and the fluorescent brightness is provided above the one row of the crushed glass 1. A sensor 32 is provided, and a suction duct 42 is provided so that, when an impurity 38 is detected by the sensor 32, a valve 41 is opened via a control device 40 to remove the impurity 38 by suction. At this time, the processing capacity can be increased by arranging a plurality of the above-mentioned devices in parallel as shown in the drawing.

Incidentally, the present invention is not limited to the above embodiment, the permeation method of the permeation tank, the cleaning method of the cleaning tank, the drying method of the drying tank, the ultraviolet irradiation method of the ultraviolet irradiation chamber that various methods can be carried out, It is needless to say that the impurity selection apparatus can also adopt various methods other than those shown in the drawings, and that various modifications can be made without departing from the scope of the present invention.

[Effects of the Invention] As described above, according to the method for identifying impurities in recycled crushed glass of the present invention, when the crushed glass is brought into contact with the water-washable fluorescent penetrant and then washed with water, the crushed glass becomes fluorescent. Since the penetrant does not penetrate, it is washed off immediately.However, since the fluorescent penetrant permeates the impurities, it remains even after washing with water, so only the impurities emit fluorescence when irradiated with ultraviolet light. It is possible to easily and surely identify, thus facilitating the sorting work and improving the efficiency, and it is also possible to automatically sort the impurities by utilizing the fact that the above impurities emit fluorescence. It can produce the effect.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an example of an apparatus for carrying out the method of the present invention, and FIG. 2 is a plan view showing an example of an apparatus for automatically selecting impurities by using the method of the present invention. FIG. 3 is a side view of FIG. 2, FIG. 4 is a side view showing another example of the impurity selecting apparatus, and FIG. 5 is an explanatory view showing still another example of the impurity selecting apparatus. 1 is coarsely crushed glass, 3 is a permeation tank, 7 is a water-washable fluorescent permeation liquid,
11 is a washing tank, 17 is a water spray nozzle, 19 is a drying tank, 26 is an air pipe, 27 is a conveyor, 28 is an ultraviolet irradiation chamber, 29 is an ultraviolet irradiation lamp, 30 is an impurity selection device, 31 is a guide plate, 32 Is a fluorescence brightness sensor, 33 is a valve, 34 is an air gun, 35 is a control device, 38 is an impurity, 39 is a guide plate, 40 is a control device, 41 is a valve,
42 indicates a suction duct.

Claims (1)

[Claims] 1. A coarsely crushed glass obtained by crushing is brought into contact with a water-washable fluorescent penetrant for adhesion and permeation, and then washed with water to wash off the fluorescent permeate adhering to the surface of the roughly crushed glass. A method for identifying impurities in reusable crushed glass, characterized by irradiating the crushed glass with ultraviolet light and then irradiating the crushed glass with ultraviolet rays, and causing the fluorescent penetrant that has penetrated into the impurities to fluoresce to identify the impurities.