JPH09208243A - Glass treatment and treating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a glass treatment method and treating device which are simple in constitution and are inexpensive by enhancing the treatment efficiency of glass, effectively preventing the elution of a glass component into granulated water and suppressing environmental pollution. SOLUTION: This glass treatment method has a stage for cooling fused glass flowing down from a glass fusing furnace and a stage for granulating the fused glass subjected to cooling. The glass treatment method has a stage for cooling the fused glass allowed to flow down from the glass fusing furnace down to the softening point or glass transition point of the glass and a stage for granulating the fused glass subjected to the cooling. This glass treating device has a glass downflow means for allowing the fused glass to flow down, a cooling means for cooling the fused glass allowed to flow down by the glass fusing means and a granulating means for granulating the fused glass subjected to the cooling.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a glass processing method and a glass processing apparatus for processing glass which is widely used in a receiving tube, a transmitting tube, an electron tube represented by an X-ray tube and the like.

[0002]

2. Description of the Related Art Conventionally, lead glass used in electron tubes and the like has been required to have higher quality due to requirements such as use conditions and use environments. Generally, glass is manufactured by mixing each raw material, then melting and molding, but in the molten glass, since the surface layer portion is in contact with the outside world, there is a difference in temperature distribution etc. depending on the region. Cage,
The composition of the molten glass differs slightly depending on the region. Therefore, in order to achieve high quality of glass, the surface layer portion of the molten glass is once removed and only the internal region of the molten glass is used as the glass material. Various glass processing methods have been tried in order to collect, remelt and reuse the removed surface layer portion of the molten glass. That is, it is a glass treatment method represented by a water granulation method, a solidification recovery method, and the like.

In the water granulation method, the surface layer part of the molten glass is overflowed and removed from the side wall of the fining tank of the melting furnace or a part of the forehearth, and the molten glass that overflows and flows down is received and granulated by a chute with water flowing, This is a method of collecting and reusing as cullet (waste glass).

In the solidification recovery method, the surface layer portion of the molten glass is overflowed and removed from the side wall of the fining tank of the melting furnace or a part of the forehearth, and the molten glass that overflows and flows down is simply recovered, solidified and reused. Is the way.

However, in the water granulation method, the recovery rate of cullet is low due to the scattering of water granulated glass, and the water content of the recovered cullet is high, so that a separate cullet drying step is required for reuse. There was a problem that a large amount of water granulated water was required. Further, since components such as lead in the glass are eluted into the water granulated water which becomes waste water and pollute the environment, there is a problem that the water granulated water must be further treated. In particular, the standard for the emission of lead in wastewater is strictly regulated by the Water Pollution Control Law amended in 1995, and the equipment and cost required for the treatment of water granulated water are increasing. Therefore, a method of circulating and using water granulation water is also used,
In order to reach a high concentration of elution components such as lead during granulation, the granulated water must be treated, and since the granulated water becomes hot, it is necessary to install a cooling tower, which is an essential solution. Has not reached.

Further, in the solidification recovery method, it is difficult to transport the recovered glass in the form of lumps, and the crushing step must be performed for reuse, and dust prevention measures must be taken for crushing. There was a problem.

That is, the glass processing method represented by the water granulation method, the solidification recovery method, etc. has problems that the processing efficiency is low, the equipment is large, and the processing cost is high. Therefore, it is a rational solution to prevent the elution of glass components such as lead into water while making the most of the advantage of the water granulation method that does not generate dust and can be crushed into particles that are easy to reuse.

[0008]

DISCLOSURE OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems and has a high glass processing efficiency, and effectively prevents the elution of glass components into water that has been granulated to protect the environment. An object of the present invention is to provide a glass processing method and a processing apparatus that suppress contamination and have a simple structure and are inexpensive.

[0009]

The glass processing method according to the present invention comprises the steps of cooling the molten glass that has flowed down from the glass melting furnace and granulating the cooled molten glass. I am trying.

In the present invention, the molten glass is flowed down from the glass melting furnace and cooled. Next, the cooled molten glass is put into water and granulated.

In the present invention, the molten glass may be cooled to such an extent that glass components, particularly heavy metal components such as Pb, Ba, Sr or Sb, are not eluted in the water granulated water, and the temperature of the glass during cooling is It may be appropriately determined according to the characteristics of the glass to be treated. However,
Cooling to a temperature around the softening point of the glass, especially around the glass transition point (transition temperature) at which the glass undergoes a structural change and suddenly becomes hard and brittle, and when poured into water and granulated, the glass component in the granulated water It is preferable because the elution of can be reliably suppressed to a low level.

Further, the glass processing method according to the present invention has a step of cooling the molten glass flown down from the glass melting furnace to the softening point of the glass, and a step of granulating the cooled molten glass. Is characterized by.

In the present invention, the molten glass is flowed down from the glass melting furnace and cooled to at least the softening point of the glass. Next, the cooled molten glass is introduced into water and granulated.

In the present invention, the molten glass is cooled to a temperature below the softening point of the glass, preferably to a temperature around the glass transition point (transition temperature) at which the glass undergoes a structural change and becomes rapidly hard and brittle, and then poured into water. By granulating with water, the elution of the glass component into the granulated water can be reliably suppressed to a low level.

Further, the glass processing method according to the present invention is
The method is characterized by including a step of cooling the molten glass flowing down from the glass melting furnace to a glass transition point of the glass, and a step of granulating the cooled molten glass.

In the present invention, the molten glass is flowed down from the glass melting furnace and cooled to at least the glass transition point of the glass. Next, the cooled molten glass is introduced into water and granulated.

In the present invention, when the molten glass is cooled to a predetermined temperature, either quenching or slow cooling does not pose any problem, but the compositional composition of the glass in each region of the molten glass is made uniform, and the molten glass is granulated. From the viewpoint of reducing the elution of the glass component into the glass, it is preferable to perform appropriate quenching.

In the present invention, the glass to be treated is not particularly limited, and it can be applied to various glasses represented by lead-containing glass containing Pb.

Further, the glass processing apparatus according to the present invention comprises a glass flow-down means for flowing down the molten glass, a cooling means for cooling the molten glass flowed down by the glass melting means, and water-cooling of the cooled molten glass. Water granulation means for

In the present invention, the molten glass flowing down from the glass flow-down means is supplied to the cooling means, and the molten glass is cooled to a predetermined temperature. Then, the cooled molten glass is introduced into a water granulating means, and is crushed and collected by a water granulating process.

In the present invention, a glass melting tank kiln, a crucible kiln, an electric melting furnace, or the like can be preferably used when manufacturing the molten glass.

In the present invention, the glass flow-down means for flowing down the molten glass is not particularly limited as long as it can flow down the surface portion of the molten glass, and for example, it can flow down the surface portion of the molten glass by overflow. Is mentioned. From the viewpoint of simplification of the device, the glass flow-down means is usually installed in a part of the forehearth for controlling and distributing and supplying the molten glass from a glass melting tank kiln, a crucible kiln, an electric melting furnace, or the like. .

As the cooling means for cooling the molten glass, a temperature at which the glass component does not elute in the granulated water, for example, around the softening point of the glass, in particular, the glass transition point at which the glass undergoes a structural change and becomes rapidly hard and brittle. Any material that can cool the molten glass to a temperature around (transition temperature) may be used. When the molten glass is continuously cooled, the cooling means is usually provided with a water-cooling type or air-cooling type adjusting means for maintaining a predetermined temperature in order to prevent the cooling means from heating.

Further, the water granulating means is not particularly limited as long as it is generally used for water granulation of glass, and can be appropriately used.

[0025]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments for carrying out the present invention will be described below with reference to the drawings. In each drawing, the same components are designated by the same reference numerals and detailed description thereof will be omitted. Further, the present invention is not limited to this embodiment without departing from the gist thereof.

FIG. 1 is a diagram showing an embodiment of the glass processing apparatus of the present invention.

In FIG. 1, reference numeral 1 is a glass melting furnace for melting glass, reference numeral 2 is a fore hearth for temperature-controlling and distributing the molten glass 3 melted in the glass melting furnace 1, and reference numeral 4 is a fore hearth. 2 is provided on the side wall,
An opening for flowing out the surface layer of the molten glass to the outside,
Reference numeral 5 is an outlet of the molten glass 3.

Further, reference numeral 6 is a plate-shaped processing device for cooling and shaping the molten glass 3 that has flowed down, and reference numeral 7 is a chute for supplying the molten glass 3 cooled by the plate-shaped processing device 6 to a conveyor 8. Reference numeral 9 is a glass bear into which the molten glass 3 transported by the transport conveyor 8 is charged and subjected to water granulation processing.

The plate-shaped processing device 6 will be described below.

2 and 3 are a front view and a top view showing an embodiment of the plate-like processing apparatus 6.

In FIGS. 2 and 3, reference numerals 10 and 11 denote cylindrical rollers which rotate in synchronization with the power of the motor 12 and have a water passage 13 for water cooling therein. The roller 11 is arranged to face the roller 11. Further, reference numeral 14 is a water supply port for introducing water of a predetermined temperature into the water pipe 13 from a supply source (not shown), and reference numeral 15 is an outlet for discharging the water introduced into the water pipe 13. The cylindrical roller 10, the cylindrical roller 11, and the motor 3 are installed on the installation plate 16, and a moving pulley 17 attached to the installation plate 16 is configured to be movable on the installation frame 18. Therefore, even when the plate processing device 6 is stopped due to a trouble or the like, the installation plate 16
Can be easily moved, and subsequent recovery work becomes easy. The reference numeral 19 designates a cylindrical roller 10 and a cylindrical roller 11.
It is an adjustment handle for adjusting the interval between and.

Next, one embodiment of a glass processing method using the glass processing apparatus of this embodiment will be described with reference to FIGS.

First, the molten glass 3 melted in the glass melting furnace 1 is clarified by the fore hearth 2. Next, the glass in the surface layer portion of the molten glass 3 overflows from the outlet 5 of the opening 4 provided on a part of the side wall of the fore hearth 2 for allowing the glass in the surface layer portion of the molten glass 3 to flow out. The plate-shaped processing device 6 is disposed immediately below the opening 4, and the molten glass 3 flowing down is supplied to the cylindrical roller 10.
And the cylindrical roller 11 to cool it,
Press in a ribbon. At this time, the cylindrical roller 10 is rotated counterclockwise and the cylindrical roller 11 is rotated clockwise by the driving force of the motor 12. Further, the temperature of the molten glass changes depending on the amount of glass flowing out, the amount of cooling water flowing through the cylindrical roller 10 and the cylindrical roller 11, and the like. After passing between 10 and the cylindrical roller 11, it is cooled to about 500 to 650 ° C.

Next, the molten glass 3 pressed in a ribbon shape
Goes through the chute 7 and the conveyer 8 to the glass bear 9
It is thrown into the water stored in and crushed into cullet. In addition, when the glass burns on the chute 7 and becomes stagnant, water may be poured onto the chute 7.

Finally, the granulated cullet is taken out from the water stored in the glass bear 9, accumulated, dried, and then reused as a glass raw material. The glass bear 9 is continuously supplied with water, and the water used for water granulation overflows from the glass bear 9 and is collected in a drainage basin along a drainage channel (not shown). Although it is designed to flow into the final treatment tank of the business establishment, the granulated water is supplied to the water pipe 13 for circulation, and the cylindrical roller 10
It may be used as cooling water for the cylindrical roller 11.

As described above, the elution of the glass component into the granulated water can be suppressed, the environmental pollution can be prevented, and the recyclability as the glass raw material can be enhanced.

Regarding prevention of elution of glass components,
Although it is not always necessary to make the molten glass into a ribbon shape, by forming the ribbon, the molten glass can be conveyed to the glass bear without being scattered from the chute or the conveyer conveyor,
Further, it is preferable that the thickness is reduced in advance so that water can be easily granulated into a suitable particle size.

In the plate-like processing device 6, the conditions for forming the molten glass into a ribbon shape are not uniquely determined because they vary depending on the roller diameters of the cylindrical rollers 10 and 11, but when the roller diameter is 160 mm. For example, the molten glass can be formed into a ribbon shape by setting the following conditions.

Roller rotation speed: 3 to 10 rpm Roller interval: 0.4 to 1.5 mm Ribbon thickness: 0.7 to 1.5 mm Cooling water amount: 5 to 7 l / min Cooling water temperature: 28 ° C. Roller rotation speed is If it is less than the above lower limit, the glass may stagnate and rotation may stop. If it exceeds the above upper limit, the glass is not easily separated from the roller, and the glass may be entangled or scattered in the chute. If the roller interval is less than the above lower limit, the glass may stagnate, and if it exceeds the above upper limit, it does not form a ribbon. Furthermore, the ribbon thickness is 1.5m
When the thickness exceeds m, the ribbon becomes rod-shaped and the ribbon may not be broken even if it comes into contact with the chute, which may cause a trouble. Therefore, the ribbon thickness is set so as not to exceed the above upper limit.

It is also possible to provide a protrusion on the surface of the roller to periodically form thin concave grooves on the glass ribbon, and to easily break this portion.

[0041]

EXAMPLE A glass composition containing about 30% of PbO and having a softening point of 643 ° C. and a glass transition point of 490 ° C. was used to treat the glass used in the neck tube for a color cathode-ray tube. went. The water granulated from the glass bear 9 is continuously introduced into the final treatment tank, but the wastewater from other systems also flows into the final treatment tank and mixes therewith. It was conducted.

(Embodiments 1 to 3) In FIG. 1, a stainless container containing 2 liters of water was installed immediately below the plate-shaped processing apparatus 6, and about 200 molten glass which passed through the plate-shaped processing apparatus 6 was installed.
g was received in a stainless steel container and granulated. Next, 500 ml of water-granulated water in the stainless steel container was sampled, and the amount of lead in the water-granulated water was analyzed.

At this time, by changing settings such as the number of rotations of the cylindrical roller in the plate-shaped processing device 6, the roller interval, the cooling water amount, the temperature of the cooling water, and the interval between the plate-shaped processing device 6 and the stainless steel container, The temperature of the molten glass at the time of water granulation (the temperature of the molten glass immediately before being put into the stainless steel container) was changed to give each example.

Comparative Example 1 In FIG. 1, a stainless steel container containing 2 liters of water was placed directly below the opening 4 of the forehearth 2, and about 200 g of molten glass was directly received by the stainless steel container and granulated. Next, add 5 parts of water granulated water in the stainless steel container.
00 ml was collected, and the amount of lead in the granulated water was analyzed.

Table 1 shows the temperature of the molten glass at the time of water granulation and the analysis results of water granulation water in each Example and Comparative Example.

[0046]

[Table 1] As is clear from Table 1, the amount of lead elution into the water granulated water tends to decrease as the temperature of the molten glass during water granulation decreases, and in particular, the softening point (643 ° C.) of the glass
This tendency was remarkable in the following temperature range. The lead elution amount is the result of correction using the lead content in the granulated water before the granulation treatment.

(Example 4) In Example 1, the temperature of the molten glass at the time of water granulation (the temperature of the molten glass immediately before being put into a stainless steel container) was changed to a glass transition to make the glass suddenly hard and brittle. Below the point (transition temperature) 3
The water granulation treatment was performed in the same manner as in Example 1 except that the temperature was set to 00 to 400 ° C.

As a result, the amount of lead eluted from the glass was reduced to 60 to 70% of the amount of lead eluted in Example 1.

Therefore, it can be understood that the elution of the glass component into the water granulation can be more effectively prevented by cooling the temperature of the molten glass to around the glass transition point of the glass and then water granulation.

Although the above-mentioned examples are the results for one kind of glass, the same tendency is exhibited in the treatment of other glasses having different PbO contents, softening points and glass transition points, and the water-granulation of lead glass Not only was the amount of lead elution in water reduced, but the advantages of preventing cullet scattering and improving cullet handling were also recognized.

[0051]

As described above in detail, according to the present invention, the molten glass flowed down from the glass melting furnace is once cooled, and then the cooled molten glass is water granulated. It is possible to provide a glass treatment method which is highly expensive, in which the elution of glass components into water granulation water is effectively prevented, environmental pollution is suppressed, and the configuration is simple and inexpensive.

Further, according to the present invention, the molten glass flowed down from the glass melting furnace is once cooled to a temperature not higher than the softening point of the glass, and then the cooled molten glass is water granulated. It is possible to provide a glass treatment method in which elution of glass components into water granulation is more effectively prevented, environmental pollution is suppressed, and the configuration is simple and inexpensive.

Furthermore, according to the present invention, the molten glass flowed down from the glass melting furnace is once cooled to at least the glass transition point of the glass, and then the cooled molten glass is water granulated. It is possible to provide a glass treatment method which is expensive, in which the elution of the glass component into the granulated water is more effectively prevented, environmental pollution is suppressed, and the configuration is simple and inexpensive.

According to the present invention, cooling means for cooling the molten glass flown down by the glass melting means and granulation for granulating the cooled molten glass are provided after the glass melting means for flowing down the molten glass. And has a means, the molten glass can be cooled to a predetermined temperature before the water granulation treatment, and then the water granulation treatment can be performed, so that the glass processing efficiency is high and the glass component in the water granulation water is It is possible to provide a glass processing apparatus that effectively prevents the elution of the glass, suppresses environmental pollution, has a simple configuration, and is inexpensive.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of a glass processing apparatus of the present invention.

FIG. 2 is a front view showing an embodiment of the plate-shaped processing device 6.

FIG. 3 is a top view showing an embodiment of the plate-shaped processing device 6.

[Explanation of symbols]

1 ... Glass melting furnace 2 ... Fore hearth 3 ... Molten glass 4 ... Opening 5 ... Outlet 6 ... Plate processing unit 7 ... Chute 8 ...
… Conveyor 9 ……… Glass Bear 10 ……… Cylindrical Roller 1
1 ... Cylindrical roller 12 ... Motor 13 ... Water pipe 14 ...
Water supply port 15 ……… Drain port 16 ……… Installation plate 17 ………
Pulley for movement 18 ………… Installation stand 19 ………… Adjustment handle

Claims (7)

[Claims] 1. A glass processing method comprising: a step of cooling molten glass that has flowed down from a glass melting furnace; and a step of granulating the cooled molten glass. 2. A glass processing method comprising: a step of cooling molten glass that has flowed down from a glass melting furnace to a temperature equal to or lower than the softening point of the glass; and a step of granulating the cooled molten glass. 3. A glass processing method, comprising: a step of cooling molten glass flowing down from a glass melting furnace to a glass transition point of the glass or lower; and a step of water-cooling the cooled molten glass. . 4. The glass comprises Pb, Ba, Sr and S.
The glass processing method according to claim 1, wherein the glass is a glass containing at least one element selected from the group consisting of b. 5. A glass flow-down means for making the molten glass flow down, a cooling means for cooling the molten glass flowed down by the glass flow-down means, and a water granulation means for water granulating the cooled molten glass. Characteristic glass processing equipment. 6. The glass processing apparatus according to claim 5, wherein the cooling means has a pair of water-cooled rolls that are arranged so as to be rotatable and face each other. 7. The glass comprises Pb, Ba, Sr and S.
The glass processing apparatus according to claim 4 or 5, which is a glass containing at least one element selected from the group consisting of b.