JP2009298648A - Method for producing raw material of thin sheet glass - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve such a problem that wet sand articles are apt to be sorted (removed) as they are. <P>SOLUTION: The method for producing a raw material of thin sheet glass includes the steps of: crushing the water-added raw sand W1 so that crushed sand has the preset crushed particle size larger than the preset upper limit of a glass raw material; screening crushed particles W2, each of which has the particle size equal to or larger than the preset upper limit of the glass raw material and smaller than the preset crushed particle size, from the crushed sand W2; dehydrating the screened crushed sand W3; drying the dehydrated crushed sand W7; and sorting the dried crushed sand W8 into standard articles having the particle size within the preset range and off-standard articles. The off-standard articles are removed at the sorting step being the final step of this method, namely, sorted (removed) as the dried crushed sand W8. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a method for producing a raw material of a thin glass used for, for example, a liquid crystal monitor.

  The origin of silica sand, which is the main raw material for thin glass, is mainly Australia and Malaysia. Currently, Japan imports from these countries, and various impurities adhere to and mix with the raw sand produced. Since the particle size is not suitable for thin glass raw material, it is common to remove impurities after importing and pulverize to a predetermined particle size, and the current raw sand is crushed dry It is.

In addition, wet pulverization is a common method for pulverizing ores and the like. For example, a raw material supply device, a wet rod mill, a classifier that separates unnecessary dust (fine particles), and a water supply device are used. There is a wet sand making facility in which the discharged sand product is conveyed and stored in a product recovery device (see, for example, Patent Document 1).
Japanese Patent No. 2776222 (claims, paragraph numbers [0004], [0013], FIG. 1)

  However, in the above prior art, since the sand product in a wet state is separated, it is easy to be discharged in a state where fine-grained sand adheres to the classified coarse-grained sand, and thus accurate separation cannot be performed. There were issues that had to be resolved.

  The present invention is based on the above prior art, and in view of the problem of separating sand products in a wet state, adding water to the raw sand and pulverizing at a pulverization setting value larger than the set upper limit value of the glass raw material, From the pulverized sand, a sieving step for passing the pulverized grains whose upper limit is not less than the set upper limit of the glass raw material and less than the pulverized set value, a dehydration step for removing moisture from the crushed sand, and drying the dehydrated pulverized sand Process, particle size adjustment process that removes fine powder products from the exhaust generated during the drying process and mixes quantitatively into the dry crushed sand as needed, dry crushed sand within the specified range and non-standard products By separating the impurities adhering to and mixed with the raw sand prior to the drying step, allowing them to be removed and contained in water, and pulverizing particles with a particle size greater than the pulverization set value. While removing the grains in the sieving process By passing non-standard products that are within the set range and non-standard products that are below the set range together with non-standard products that are above the set range, the outflow of non-standard products that are within the set range is suppressed. By removing in a certain separation step, the dried crushed sand can be separated to solve the above-mentioned problem.

In short, the present invention has a step of adding water to the raw sand and pulverizing with a pulverization set value larger than the set upper limit value of the glass raw material, so that impurities adhering to and mixed with the raw sand are contained in the water. In the case of wet pulverization, if it is too finely pulverized, it is easy to be removed with water, but if it is coarse, fine particles that are likely to flow out will flow together with coarse particles that are difficult to flow out. In addition, since the crushed sand has a sieving step for passing the pulverized grains whose upper limit value is greater than or equal to the set upper limit value of the glass raw material and less than the pulverized set value, The crushed sand that is surely removed can be removed in advance before the dehydration step described later to make only the crushed sand that needs to be dehydrated and dried. Drying process and drying Since it has a process of separating crushed sand into non-standard products and non-standard products with a particle size within a set range, it is possible to completely separate the grains by drying, so impurities in non-standard products and non-standard products Mixing and mixing of non-standard products with non-standard products can be suppressed as much as possible. Therefore, the quality of non-standard products can be improved, and by reducing the particle size, it can be easily melted during glass production. , Fuel consumption can be reduced and running costs can be reduced.
Furthermore, if the particle size is made too small, it will easily fly up into the furnace when it is charged into the furnace at the time of glass production, and will be scattered as a fire powder. Fine powder enters and it becomes difficult to mix other raw materials, but in the present invention, if it is separated so as to remove fine products below the set range, the raw material for the input amount can be used as it is, The gap between them becomes large, and other raw materials can be easily mixed.
In addition, if the beneficiation process is performed after the sieving process and then transferred to the drying process, heavy minerals that could not be removed by the sieving process can be removed. If the separation process is performed, foreign substances mistakenly mixed after the sieving process can be removed, and if a magnetic separation process is added after the separation process, iron pieces mixed after the drying process can be removed. Higher quality raw material products can be manufactured.
Furthermore, only the underflow from which the overflow including the relatively lightweight fine particles released from the crushed sand is removed by passing the slurry at each stage before the sieving process, before the beneficiation process and before the drying process through a cyclone. Then, since it can process in the state from which the impurity was removed reliably, a higher quality raw material product can be manufactured.
In addition, relatively heavy fine particles that have been removed as inclusions by the cyclone are precipitated by sand corn, and this precipitate is extracted, after the wet grinding process, after the sieving process, after the beneficiation process. If mixed with sludge, the precipitate is also dried, so it can be used for particle size adjustment, or can be made available separately as a fine powder product or a non-standard product that is less than the set range. It can be used.

  Since it has a particle size adjustment process that removes fine powder products from the exhaust generated during the drying process and mixes it quantitatively into the dry crushed sand as needed, it can be removed before drying or soared in the dryer to dry crushed sand Even if the amount of residual fine powder is very small, it is possible to adjust the particle size by quantitatively mixing fine powder products collected by the dust collector for dryers. I can do it.

A process in which the residual crushed sand in the sieving process and / or the coarse-grained product in the fractionation process is wet-pulverized together with the raw sand, or the residual crushed sand in the sieving process and / or the coarse-grained product in the fractionation process is wet-pulverized again. Since this re-ground sand is dewatered together with the pulverized sand by the wet pulverization process, when turning the non-standard product above the set range to the wet pulverization process or the rewet pulverization process to treat the raw sand without waste, When processing all the raw sand, the processing amount in the drying process may be larger than the total amount of raw sand, but if the residual crushed sand in the sieving process is re-ground, the separation process will be performed after the drying process. Since the total amount of non-standard products that are surely removed can be reduced at the stage before drying, the amount of processing during the drying process can be reduced more reliably than when processing without re-grinding.
Furthermore, if only the underflow from which the sludge before re-grinding is passed through a cyclone and the overflow including relatively light particles released from the crushed sand is removed is processed, the impurities are surely removed. Therefore, it is possible to produce a higher quality raw material product, and its practical effect is significant.

In the manufacturing system of the thin glass raw material according to the present invention, the raw sand wet pulverizer, the pulverized sand sieving device supplied from the wet pulverizer, and the pulverized sand passed through the sieving device A dehydrating device, a drying device for the dewatered crushed sand carried out from the dehydrating device, and a separation device for taking out a raw material product having a desired particle diameter from the dried crushed sand carried out from the drying device.
Furthermore, a rewetting pulverization means for residual pulverized sand to the sieving device may be provided, and the reground pulverized sand by the rewet pulverizing means and the passing pulverized sand by the sieving device may be dried.
This will be specifically described below.

Hereinafter, an example of the present invention will be described based on the drawings.
FIG. 1 is a diagram showing the steps of a method for producing a thin glass raw material according to the present invention, FIG. 2 is a schematic diagram showing the steps up to the dehydration step of the thin glass raw material production system, and FIG. FIG. 4 is a schematic diagram showing the process after the dehydration process of the thin glass raw material production system, and FIG. 5 is a chart diagram showing the process after the dehydration process in the production process of the thin glass material. FIG. 6 is a chart for explaining processing steps of raw sand and the like, and such a thin glass raw material manufacturing system has a raw sand charging device 1, a wet pulverizer 2, a sieving device 3, and a rewet pulverizing means from the start side. The beneficiation machine 4, the dewatering device 5, the dewatered crushed sand charging device 6, the drying device 7, the check sieving device 8, and the sorting device 9 are sequentially arranged.

  In the raw sand charging device 1, as shown in FIG. 2, a raw sand hopper 10 into which raw sand W1 is charged, a belt feeder 10a disposed below the raw sand hopper 10, and a belt feeder 10a And a raw sand conveyor 11 for transporting the transferred raw sand W1 to the wet pulverizer 2.

  In the wet pulverizer 2, as shown in FIG. 2, water is added to the raw sand W1 introduced by the raw sand conveyor 11 (raw sand: water = 1: 1 to 1.5). The sand W1 is pulverized. For example, a pulverizer such as a conical ball mill is used, and a first relay tank 12 that temporarily stores pulverized sand W2 and water slurry is disposed on the downstream side of the wet pulverizer 2. is doing.

In the sieving device 3, as shown in FIG. 2, the sieving unit is a step of sieving in a plurality of stages with a plurality of sieving parts 13, 13a... And each sieving part 13, 13a. Each sieving machine 14, the sieving machine 14 is a circular vibrating sieve, and the pulverized sand W 3 having a particle size of less than 0.19 mm passed through the sieving device 3 on the downstream side of the sieving device 3 and water A second relay tank 13 is provided for temporarily storing mud.
Specifically, the first sieving part 14 is provided with two sieving machines 14 and 14, and the second sieving part 14a is also provided with two sieving machines 14 and 14, and the first sieving part 14 The crushed sand W3 that has passed through the sieving machines 14 and 14 is put into the sieving machines 14 and 14 of the second sieving part 14a, and the pulverized sand that has passed through the sieving machines 14 and 14 of the second sieving part 14a. The slurry containing the sand W3 is temporarily stored in the second relay tank 15.

In the rewet pulverization means, as shown in FIG. 2, the wet pulverizer 2 is used (pattern 1), or a rewet pulverizer 16 is separately provided (pattern 2).
In the case of the pattern 1, a transport device 17 (shown by a dotted line in FIG. 2) for transporting the residual crushed sand W4 to the sieving machine 14 of each sieving unit 13, 13a.
In the case of the above pattern 2, a residual crushed sand charging device 18 for the rewet pulverizer 16 is provided. The residual crushed sand charging device 18 includes a residual crushed sand hopper 19 into which the residual crushed sand W4 is charged, and the residual crushed sand. A belt feeder 19a disposed below the hopper 19 is provided, and a third relay tank 20 is provided on the downstream side of the rewet grinder 16 for temporarily storing regrind sand W5 and water.

  In the beneficiation machine 4, as shown in FIG. 2, in the pattern 1, from the passing ground sand W3, in the pattern 2, the passing ground sand W3 and the reground sand W5 from the iron sand, chromite, Impurities such as mud (hereinafter referred to as heavy minerals) are removed, for example, a spiral beneficiary machine, and crushed sand (mineralized crushed sand W6) and water that have passed through the beneficiary machine 4 downstream of the beneficiation machine 4 The 4th relay tank 21 which stores temporarily the mud which consists of is arrange | positioned.

  In the dewatering device 5, as shown in FIG. 2, water is removed from the crushed sand (mineralized crushed sand W6 in this embodiment) that has been processed up to the immediately preceding process by, for example, a vacuum dehydrator. This is crushed sand W7, and dewatered and removed water is sent from the dewatering device 5 to the fourth relay tank 21.

  In the charging device 6 for the dewatered and crushed sand W7, as shown in FIG. 4, the dewatered and crushed sand hopper 22, the belt feeder 22a disposed below the dewatered and crushed sand hopper 22, and the dewatered and crushed sand W7 are dried. And a dewatered pulverized sand conveyor 23 for conveying to the apparatus 5.

In the drying device 7, as shown in FIG. 4, the dewatered crushed sand W <b> 7 transported from the dewatering device 5 is completely dried while being transported downstream to obtain dry crushed sand W <b> 8, for example, a rotary dryer. It is said.
The drying device 7 may not be a rotary dryer type, and may be, for example, a batch type. However, the rotary dryer type is more preferable from the viewpoint of continuous operation.
A dust collector 45 for the drying device is connected to the exhaust port 44 of the drying device 7, and the fine powder removed from the exhaust gas is discharged to the next process as a fine powder product X1 at the lower portion of the dust collector 45 for the drying device. Or a screw conveyor 46 to be mixed in the dry crushed sand W8.

  In the check sieving device 8, as shown in FIG. 4, for example, a circular vibrating screen that removes particles having a particle size equal to or larger than the set upper limit (0.5 mm) is used, and the drying device is passed through the relay conveyor 24. 7 is disposed downstream of the check sieving device 8, and a bucket conveyor 25 for sending the passed dry crushed sand W8, that is, the passed dry crushed sand W9, to the next separation device 9 is disposed. The dry crushed sand W8 remaining in the apparatus 8, that is, the residual dry crushed sand W10, is returned to the raw sand hopper 10 or the residual crushed sand hopper 19 to remove metal parts and metal debris mixed in the processing step. .

  In the sorting device 9, as shown in FIG. 4, an intermediate tank 26 for temporarily storing the passing dry crushed sand W9 conveyed from the drying device 7, and at least one place below the intermediate tank 26 (drawing) 2) and a separation unit 28 for supplying dry crushed sand W8 to a separation unit 28, which will be described later, and a separation unit 28 provided below the introduction unit 27. And a set amount of dry crushed sand W8 is stably supplied, and the separation unit 28 has the same number as the screw conveyor 29 in the input unit 27, such as a gyro shifter. The sorter 30 has three sorters 30 (on the drawing), and the sorter 30 separates the dry crushed sand W8 into a separation passing product and a separation residual product, and the separation passing product is a fine-grained product WB. Used as glass raw material (less than 0.106 mm) and separated Distillate product is made or carried to the next step as the crude grain products WA, to as to be returned turned to the original sand hopper 10 or the residual grinding sand hopper 19.

  A coarse product bucket conveyor 33 and a fine product bucket conveyor 34 for placing the coarse product WA and the fine product WB into the coarse product tank 31 and the fine product tank 32 are disposed downstream of the sorting device 9. Magnetic separators 35 and 36 for removing iron powder and iron pieces in the coarse product WA and the fine product WB are disposed on the end side of the coarse product bucket conveyor 33 and the fine product bucket conveyor 34.

  A first cyclone 37 downstream of the first relay tank 12, a second cyclone 38 downstream of the second relay tank 15, a third cyclone 39 downstream of the third relay tank 20, and a fourth relay tank 26 4th cyclone 40 is arranged in the downstream of each, and the slurry which is the cyclone under of each 1st-4th cyclone 37, 38, 39, 40 is thrown into corresponding sieving device 3, beneficiator 4 and dehydrator 5 I try to do it.

Below the sand cone 41 to which the cyclone over water from each of the first to fourth cyclones 37, 38, 39, 40 is sent, the underflow extracted from the sand cone 41 (sludge containing the precipitated particles W12). A relay tank 42 for temporary storage is provided, and the slurry in the relay tank 42 is sent to the first to fourth relay tanks 12, 15, 20, and 21.
In this case, in the first relay tank 12, the slurry consisting of crushed sand W2 and precipitated particles W12 and water, and in the second relay tank 15, the slurry consisting of passed crushed sand W3, precipitated particles W12 and water, is third. The relay tank 20 temporarily stores re-ground sand W5, precipitated particles W12, and water slurry, and the fourth relay tank 21 temporarily stores the pre-sorted ground sand W6, precipitate particles W12, and water slurry.

  The overflow from the sand corn 41 (including dirt, organic matter, fine particles, etc.) is stored in the water tank 43 after being treated.

  As shown in FIG. 4, environmental dust collectors 47 are installed at the bucket conveyors 25, 33, 34, the coarse and fine product tanks 31, 32, the exhaust ports of the magnetic separators 35, 36, and the indoor ventilation ports (not shown). The fine powder removed from the exhaust gas is connected to the next process as a fine powder product X2.

  Further, between the dewatering device 5 and the dewatered pulverized sand feeding device 6, the dewatered pulverized sand W7 is carried out by a belt conveyor or the like and temporarily stored in the dewatered pulverized sand storage (not shown). In general, the dewatered and crushed sand W7 is transported from the dewatered and crushed sand yard (not shown) to the dewatered and crushed sand throwing device 6. However, if the dewatering step and the drying step are continuously operated, the dewatering device 5 and the dewatered sand What is necessary is just to provide conveyance means, such as a belt conveyor, between the grinding | polishing sand input apparatuses 6, and to connect directly.

  Next, the manufacturing method of the sheet glass raw material which concerns on this invention is demonstrated for every step.

[Raw sand input process]
The raw sand W1 conveyed from the raw sand yard (not shown) is put into the raw sand hopper 10, and the raw sand W1 is dropped on the belt feeder 10a below the raw sand hopper 10, and the belt feeder 10a. Thus, the raw sand W1 is stably supplied onto the raw sand conveyor 11 every predetermined amount, and the raw sand W1 is put into the wet pulverizer 2 by the raw sand conveyor 11.

[Wet grinding process]
A predetermined amount of raw sand W1 is charged into the wet pulverizer 2 and about 1 to 1.5 times as much water is charged into the wet pulverizer 2, and then the wet pulverizer 2 is started to After wet pulverization for a predetermined time, the slurry containing the pulverized raw sand W1 (crushed sand W2) is temporarily stored in the first relay tank 12.

[Sieving process]
Slurry (mainly crushed sand W2 + water) sent out from the first relay tank 12 is charged into the first cyclone 37, and the slurries that are under the cyclone are removed by the sieving machine 14 of the first sieving unit 14 in the sieving device 3. The sludge that passed through and passed through the sieving machine 14 of the second sieving part 14a and passed through both the first sieving part 14 and the second sieving part 14a was crushed sand W2 of less than 0.19 mm. The slurry containing (passing crushed sand W3) is temporarily stored in the second relay tank 15.

[Rewet grinding process]
(Pattern 1)
The residual crushed sand W4 to the sieving machine 14 is conveyed by the conveying device 17 and put into the raw sand hopper 8 and pulverized by the wet pulverizer 2 together with the raw sand W1.
(Pattern 2)
The residual crushed sand W4 is carried out to the sieving machine 14 and is put into the residual crushed sand hopper 19, and the residual crushed sand W4 is dropped onto the belt feeder 19a below the residual crushed sand hopper 19, and the belt feeder 19a. The residual crushed sand W4 is charged into the rewet pulverizer 16 every predetermined amount by the above, and water is charged into the rewet pulverizer 16, and then the rewet pulverizer 16 is started to set the residual crushed sand W4 to the predetermined amount. After the wet pulverization for a period of time, the slurry containing the pulverized residual pulverized sand W4 (reground pulverized sand W5) is temporarily stored in the third relay tank 20.
In this case, in consideration of pulverization in two stages, the upper limit value (0.19 mm) of the set particle diameter in the first wet pulverizer 2 is set to be larger than the upper limit value (0 in the sieving step). .., 19 mm), and the residual crushed sand W4 may be reground using the set particle size in the next rewet pulverizer 16 as the set upper limit (0.19 mm).

[Preparation process]
In pattern 1 above, the slurry in the second relay tank 15 (mainly passing ground sand W3 + water) is transferred to the second cyclone 38, and in pattern 2 the slurry in the second and third relay tanks 15 and 20 (mainly passing through). Crushed sand W3 + reground pulverized sand W5 + water) are fed into the second and third cyclones 38 and 39, respectively, and the slurry that is cyclone under is fed into the beneficiation machine 4. 2, heavy minerals and the like are removed from the crushed sand W3 and the reground pulverized sand W5, respectively, and the crushed sand W6 that has passed through the beneficiation machine 4 and the slurry made of water are temporarily stored in the fourth relay tank 26.

[Dehydration process]
Slurry containing crushed sand treated up to the previous step, that is, sludge in the fourth relay tank 26 (mainly crushed sand W6 + water) is put into the fourth cyclone 40, and the slurry that is cyclone under is dehydrated 5 The dewatering device 5 is started to remove moisture from the beneficiated ground sand W6 and carried out as dewatered ground sand W7. The dewatered water is returned to the fourth relay tank 26.

[Drying process]
The dewatered and crushed sand W7 carried out from the dewatering device 5 is put into the dewatered and crushed sand hopper 22, and the dewatered and crushed sand W7 is dropped on the belt feeder 22a below the dewatered and crushed sand hopper 22, and dewatered by the belt feeder 22a. The pulverized sand W7 is supplied onto the dehydrated pulverized sand conveyor 23 every predetermined amount, and the dehydrated pulverized sand W7 is fed into the drying device 5 by the dehydrated pulverized sand conveyor 23. Then, after being transported to the downstream side and accommodated for a predetermined time and completely dried, the dry crushed sand W8 is unloaded from the drying device 5.

[Check sieving process]
The dry crushed sand W8 carried out from the drying device 5 and transported by the relay conveyor 24 is put into the check sieving device 8, and if there is a particle having a particle size larger than the set upper limit (0.5 mm), it is finally removed. The passing dry crushed sand W9 is carried out to the bucket conveyor 25, and is put into the intermediate tank 26 in the sorting device 9 and temporarily stored by the bucket conveyor 25. If the dry crushed sand W10 is present in the residue, the pattern 1 Are put into the raw sand hopper 8 and into the residual crushed sand hopper 19 in the pattern 2, respectively, and the parts mixed in the processing process and the metal scrap as a part thereof are discarded.

[Separation process]
The passing dry crushed sand W9 temporarily stored in the intermediate tank 26 and cooled is passed through three screw conveyors 29, 29, 29 in two input sections 27, 22, respectively, and three sorters 30, 30, Passing dry pulverized sand W9 is added to 30, and the coarse product WA, which is a non-standard product remaining in each of the separators 30, 30, 30, is passed through the coarse product bucket conveyor 33, and the fine product which is a non-standard product passed. The granular product WB (less than 0.106 mm) is transported to the fine-grained product bucket conveyor 34, and the coarse-grained product bucket conveyor 33 and the fine-grained product bucket conveyor 34 are used in the coarse-grained product tank 31 and the fine-grained product tank 32. However, the iron powder and iron pieces are removed by the magnetic separators 35 and 36 immediately before the charging.
Therefore, since the passing dry crushed sand W9 is separated into non-standard products (coarse-grained products WA) and non-standard products (fine-grained products WB), the high-standard products (fine-grained products WB) used as glass raw materials are high. Quality can be improved.

[Storage and packing process]
The coarse product WA and the fine product WB stored in the coarse product tank 31 and the fine product tank 32 are measured and then packed.
However, non-standard products (coarse product WA) may be transferred from the coarse product tank 31 to the [wet pulverization step] and [re-wet pulverization step] to make products within specifications.

Cyclone over water by the first to fourth cyclones 37, 38, 39, 40 in the above [sieving step], [mineralization step] and [dehydration step] is sent to the sand cone 41, and the overflow is sent to the processing plant, After the treatment, it is returned to the water tank 43 and stored. For example, it is sent to the wet pulverizer 2 and the rewet pulverizer 16 to be used water in the wet pulverization process, and the underflow (precipitated particles W12 + water) is extracted and relay tank 42 is used. Is temporarily stored in the first to fourth relay tanks 12, 15, 20, and 21.
That is, the first to fourth cyclones 37, 38, 39, and 40 are used to precipitate relatively large particles among the fine particles contained in the cyclone over water. Since it will be processed in the “separation process”, the “separation process”, and the “dehydration process”, the raw sand W1 can be processed without waste.

In the above [drying step], when the exhaust from the exhaust port 44 of the drying device 5 passes through the dust collector 45 for the drying device, the fine powder in the exhaust is removed and the purified gas is discharged to the outside, and the screw below the screw The finely powdered product X1 removed by the conveyor 46 is quantitatively mixed into the dry crushed sand W8, and is sent to the process after the drying process (check sieving process in the present embodiment) to adjust the particle size of the dry crushed sand W8 as necessary. If it is not necessary to adjust the particle size, it is transferred to another processing facility.
When exhaust from the above-mentioned bucket conveyors 25, 33, 34, coarse / fine-grained product tanks 31, 32, and the magnetic separators 35, 36 exhaust and the indoor vent (not shown) pass through the environmental dust collector 47 Then, the fine powder in the exhaust gas is removed, the purified air is discharged to the outside, and the removed fine powder product X2 is transferred to another processing facility.
That is, since the fine powder in the dry crushed sand W8 that has soared is also collected and used as the fine powder products X1 and X2, it is possible to process and use the raw sand W1 without further waste.

  In the sorting apparatus 9 in the above embodiment, the product is classified into two types: products within the set range and products outside the set range. It may be divided into multiple types, such as sorting into three types. In short, the number of sorting can be changed by increasing or decreasing the number of sieves used, and bucket conveyors, tanks, carry-out conveyors, etc. are installed as necessary Just do it.

It is a figure which shows the process of the manufacturing method of the sheet glass raw material which concerns on this invention. It is the schematic which shows to the spin-drying | dehydration process of the manufacturing system of a sheet glass raw material. It is a chart figure which shows to the spin-drying | dehydration process in the manufacturing process of a sheet glass raw material. It is the schematic which shows the dehydration process after the manufacturing system of a sheet glass raw material. It is a chart figure which shows the dehydration process after the manufacturing process of a thin glass raw material. It is a chart figure explaining processing processes, such as raw sand.

Explanation of symbols

W Raw material product W1 Raw sand W2 Ground sand W3 Passed ground sand W4 Residual ground sand W5 Reground sand W7 Dehydrated ground sand W8 Dry ground sand X1 Fine powder product

Claims (4)

  A process of adding water to the raw sand and crushing it with a pulverization set value larger than the set upper limit value of the glass raw material, and passing from the crushed sand through a pulverized grain whose upper limit value is greater than or equal to the set upper limit value of the glass raw material and less than the pulverized set value A sieving step, a dehydration step for removing moisture from the passing crushed sand, a step for drying the dehydrated crushed sand, and a step for separating the dried crushed sand into a non-standard product and a non-standard product having a particle size within a set range. The manufacturing method of the sheet glass raw material characterized by having these.   2. The method for producing a thin glass raw material according to claim 1, further comprising a particle size adjusting step of removing fine powder products from the exhaust gas generated during the drying step and mixing them quantitatively into the dry pulverized sand as required.   The method for producing a sheet glass raw material according to claim 1 or 2, wherein the residual crushed sand in the sieving step and / or the non-standard product exceeding the set range in the fractionation step is wet crushed together with the raw sand.   It has a step of wet pulverizing the residual pulverized sand in the sieving step and / or a non-standard product exceeding the set range in the separation step, and this re-ground pulverized sand is dehydrated together with the pulverized sand in the wet pulverization step. The manufacturing method of the thin glass raw material of Claim 1 or 2.

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