JP2006231125A - Manufacturing system of shell powder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing system of shell powder, in which a large amount of shell powder of particle sizes suitable for use as inorganic foaming body composition is obtained automatically while sorting, particularly the yield of fine powder is increased, and the range of the obtained powder particle sizes, and particle distribution can be changed. <P>SOLUTION: This manufacturing system of shell powder comprises a drier 11 drying shells; a first dust collector 15 recovering shell powder of particle sizes of 0.01-50μm, preferably 0.1-10μm; a crusher part A having crushers 22, 24; a pneumatic classifier 26 classifying crushed shell powder; a second dust collector 27 recovering shell powder of particle sizes of 0.01-50μm, preferably 0.1-10μm; flow control valves 12c, 29b disposed in dust collecting passages 12b, 29; a sieve type classifier 26c connected to the pneumatic classifier 26; and a return passage 26d returning shell powder to the crusher part A. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a shell powder manufacturing system suitable for processing shell shells collected in a water intake channel or the like of a power plant to obtain shell powders particularly suitable for inorganic foam compositions.

Conventionally, seawater is used as cooling water for condensers in thermal power plants and nuclear power plants. Therefore, thermal power plants and nuclear power plants are usually constructed facing the coast, and intake tanks are installed on the premises of the power plant, intake towers are installed off the coast, and intake from the intake tower to the premises of the power plant is established. A water intake is set up in the tank to take in seawater.
By the way, marine organisms such as shellfish adhere to the inside of the intake channel, and they are peeled off and drawn into the intake tank together with the earth and sand floating in the seawater by the flow of the seawater. In this water intake tank, the earth, sand, shells and the like that have been drawn in are settled to the bottom so that earth, sand and sea life do not enter the power plant. At the power plant, shellfish attached to the intake channel and earth and sand deposited on the bottom of the intake tank, shells, etc. are cleaned and collected periodically so that seawater can be taken in smoothly. The collected earth and sand shellfish shells are processed by separating them into sand and shells using a trommel sorter, etc., and then the earth and sand are used for embankment to prevent coastal erosion, and the shells are transported to a shell processing facility. Processing.

Various methods and systems have been developed as shell processing methods and systems, depending on the use of the shell. For example, in (Patent Document 1), as a processing system for obtaining high-purity slaked lime from shells, solid-liquid separation means for separating the collected marine organisms into shellfish solids and wastewater containing algae and sludge; , Each means for crushing, drying and firing the solid after solid-liquid separation, means for modifying quick lime obtained by firing into slaked lime, means for coagulating and concentrating the waste liquid after solid-liquid separation, and after the concentration treatment A treatment system for marine organisms comprising means for drying and baking the sludge and means for purifying the supernatant after concentration treatment by a physicochemical method is disclosed.
In addition, (Patent Document 2) discloses a shell crushing process in a circulating air flow as a shell crushing method and a crushing device for using a shell as a nutritional supplement, a fertilizer, or a soil conditioner for livestock feed. A method for crushing shells into which heated air is injected, and connecting the three chambers, the crushing chamber, the classification chamber, and the collection chamber, so that air circulates, and arranging a blower on the return path from the collection chamber to the crushing chamber There is disclosed a shell crushing apparatus provided with a heated air supply unit between a blower and a crushing chamber.
In addition, (Patent Document 3) describes a method for producing finely powdered calcium for foods that can be fed with nutrition. After processing scallop shells with enzymes, they are washed with a drum scrubber, and then scallop shells are selected. At the same time as dry sterilization, primary crushing with a hammer crusher, finely pulverizing the primary crushed shell with a roller mill and classifying with an air classifier, and then sterilizing the microparticles again with steam alcohol A method for producing scallop shell fine powder calcium is disclosed.

  By the way, in recent years, as a shell application, a mixed powder obtained by mixing a shell powder obtained by pulverizing a shell and an inorganic powder obtained by pulverizing an inorganic waste material such as a glass waste material is used. It has attracted attention because it is heated and melted and foamed to produce an inorganic foam, and such an inorganic foam is reused as foam glass or artificial bone.

JP-A-6-79255 JP-A-8-131878 JP 2002-272421 A

However, when trying to obtain a shell as a raw material for the inorganic foam using the conventional shell processing method and system as described above, there are the following problems.
(1) In the processing system of Patent Document 1, since shellfish solids separated by a solid-liquid separator are finely crushed by a crusher and then dried by an air dryer, the crushed material is included in the crusher. It has a problem that it has viscosity due to moisture, and sticking or clogging occurs, resulting in a decrease in processing capacity.
(2) In Patent Document 2 and Patent Document 3, since high-temperature air is allowed to flow into the pulverization chamber of the pulverizer and the shell is dried and pulverized at the same time, the pulverizer that can be used is limited because the pulverization chamber becomes hot. At the same time, the shell must be dried to the desired moisture content from when it is put into the crushing chamber until it is discharged. There was a problem that the ability decreased.
(3) When shell powder is used as an inorganic foam composition, the size of the bubbles in the inorganic foam is determined by the particle size, so accurate classification is required for each predetermined particle size. It is required that the particle size range and particle size distribution of the resulting powder can be changed as necessary. However, in Patent Documents 1 to 3, the particle size of the obtained shell powder, in particular, the range of the fine particle size generated as dust and the particle size distribution cannot be changed, and cannot be separated for each particle size. Had.
(4) Further, not only when the shell is crushed but also when it is dried or transported, the shells are broken or chipped due to contact with each other, and a large amount of dust is generated. In particular, when a continuous dryer is used during drying, a large amount of dust is generated because the shell is continuously dried while being stirred in the rotating chamber. It has been desired to collect dust from these shells efficiently and with a desired particle size, and to easily obtain shell fine powder having high utility value as an inorganic foam composition. However, conventional shell shell processing methods and systems such as Patent Documents 1 to 3 cannot obtain fine powders of 10 μm or less alone, and are suitable for use as inorganic foam compositions. It had the subject that it was difficult to obtain a large amount of granular materials of diameter shells.

  The present invention solves the above-described conventional problems, and can automatically obtain a large amount of shell powder having a particle size suitable for use as an inorganic foam composition while selecting the particle size for each particle size. In particular, an object of the present invention is to provide a shell powder production system that can significantly increase the yield of fine powder and can change the particle size range and particle size distribution of the obtained powder as required.

In order to solve the above problems, the shell powder manufacturing system of the present invention has the following configuration.
A shell powder manufacturing system according to claim 1 of the present invention is a shell powder manufacturing system for manufacturing shell powder used as a raw material for an inorganic foam, and is a dryer for drying the shell shell that has been introduced. A first dust collector that is connected to the dryer via a first dust collecting path and collects shell powder having a particle size of 0.01 μm to 50 μm, preferably 0.1 μm to 10 μm, and the dried shell A pulverizer unit having one or more pulverizers for pulverization, an airflow classifier for classifying the crushed shell powder, and a fine powder outlet of the airflow classifier is connected via a second dust collecting passage. And a second dust collector that collects shell powder having a particle size of 0.01 μm to 50 μm, preferably 0.1 μm to 10 μm, and the first dust collecting path and / or the second dust collecting path. Coarse powder discharge of the flow rate adjustment valve and the airflow classifier A sieve classifier connected to an outlet, and a shell powder larger than a predetermined particle size among the shell powders connected to the pulverizer from the sieve classifier and selected by the sieve classifier, the pulverizer And a return flow path that returns to the part.

This configuration has the following effects.
(1) Before pulverizing the object to be processed in the pulverizer unit, the moisture content of the object to be processed is reduced to, for example, about 0% to 2% with a dryer, Since pulverization is performed, the processing amount of the pulverizer can be arbitrarily set to a desired processing amount, and the pulverized product is prevented from having viscosity due to moisture contained therein. Clogging and the like can be prevented.
(2) Since the first dust collector that collects a large amount of dust generated in the dryer is provided, the generated dust is prevented from being discharged to the outside atmosphere, and 0.01 μm to 50 μm, preferably 0.8. Fine powder of 1 μm to 10 μm can be efficiently recovered with the first dust collector.
(3) After pulverization in the pulverizer unit, the powder is classified into fine powder and coarse powder by an airflow classifier, and among the selected shell powder, a powder having a particle size of 0.01 μm to 50 μm, preferably 0.1 μm to 10 μm is obtained. Since it can be efficiently recovered by the second dust collector and the coarse powder can be selected by a sieve classifier, a shell powder having a particle size suitable for use as an inorganic foam composition is obtained for each particle size. Can be obtained in large quantities.
(4) The flow rate of the dust-containing gas is appropriately adjusted by the flow rate adjusting valve disposed in the first dust collection path and / or the second dust collection path, and the fineness in the first dust collection machine and / or the second dust collection machine. By adjusting the amount of powder recovered, the particle size and particle size distribution of the powder recovered in the sieve classifier can be adjusted.
(5) By adjusting the amount of fine powder recovered by the first dust collector and / or the second dust collector with the flow rate adjustment valve, the fineness in the shell put into the pulverizer and sieve classifier By adjusting the amount of the powder, efficient pulverization and classification can be performed.
(6) Since the return flow path is provided, the pulverized material pulverized in the pulverizer unit can be returned to the pulverizer unit and pulverized again, and can be pulverized again. Can be obtained efficiently.

Here, as the dryer, a continuous type is used in which an object to be processed is put into a rotating drying chamber from one end side, moved to the other end side while being dried, and discharged from the other end side. As the continuous dryer, a rotary dryer such as a roller kiln is used. The temperature of the hot air supplied into the dryer depends on the type of the object to be processed, the moving speed of the object to be processed in the dryer, the capacity of the dryer, etc., but the moisture content of the shell is a predetermined moisture content, for example, 0 The temperature is set to 50 ° C. to 130 ° C., which can be lowered to% to 2% and does not change the composition.
The particle diameter of the shell powder refers to a particle diameter measured by a sieving method using a JIS standard sieve, a microscopic method, or the like. As the particle size of the shell powder becomes smaller than 0.1 μm, the equipment load and the man-hour increase, and when used as an inorganic foam composition, the powder tends to aggregate and tends to be difficult to disperse uniformly. As the size increases, it tends to be difficult to form open cells in the inorganic foam. In particular, when the particle size is smaller than 0.01 μm or larger than 50 μm, these tendencies tend to be remarkable.
The first and second dust collectors are appropriately selected according to the particle size of the dust to be recovered, and a bag filter, an electric dust collector, an air filter, a cyclone, or the like is used. In particular, as the first dust collector, a thing having heat resistance against the temperature of hot air blown to the dryer, for example, a bag filter using a filter cloth having heat resistance against the temperature of hot air is used.
As the pulverizer of the pulverizer, a crusher or a crusher such as a hammer mill, a hammer crusher, a roller mill, or a jaw crusher, or a fine pulverizer such as a vibration mill or a jet mill is used. Any two or more of these pulverizers can be used in appropriate combination for primary pulverization, secondary pulverization, and the like.
As the airflow classifier, a gravity classifier, an inertia classifier, a centrifugal classifier such as a cyclone, or the like is used. Further, as the sieve classifier, a multi-stage vibration sieve or the like is used.
The return flow path may be a continuous type or a batch type. As the continuous type, a mechanical transport device such as a screw conveyor, a belt conveyor, or a bucket elevator, a pipe-type air transport device, or the like is used. As the batch type, a flexible container or the like is used, and it can be collected in a flexible container or the like, transferred, and returned to the vibration mill.

  The shell powder manufacturing system according to claim 2 of the present invention is the invention according to claim 1, wherein the shell powder is sealed, connected to each of the dryer, the pulverizer unit, and the airflow classifier. It has the structure provided with the conveyance path by which the dust scattering prevention cover was covered.

With this configuration, in addition to the operation of the first aspect, the following operation is provided.
(1) It is possible to prevent dust generated in a dryer, a pulverizer, or the like from being scattered outside by a sealed conveyance path or dust scattering prevention cover.
(2) Since it is possible to prevent wind and rain, moisture, etc. from entering the transport path, it is possible to maintain the dried state of the shells that have passed through the dryer, and the shells can be crushed and classified in the pulverizer and classifier. It can be done smoothly.

  The shell powder manufacturing system according to claim 3 of the present invention is the pulverization connected to the second dust collector from any one or more of the pulverizers of the pulverizer unit in the invention of claim 1 or 2. It has the structure provided with the dust collection path for apparatuses.

With this configuration, in addition to the operation of the first or second aspect, the following operation is provided.
(1) Dust generated in the crushing chamber of the crushing unit can be recovered by air transportation to the second dust collector through the dust collecting path for the crushing device, so that the generated dust is discharged to the outside atmosphere, etc. The fine dust can be efficiently recovered by the second dust collector.

  According to a fourth aspect of the present invention, there is provided the shell powder manufacturing system according to any one of the first to third aspects, wherein the pulverizer section roughens the shell dried by the dryer. A coarse pulverizing apparatus for pulverizing; and a vibration mill using a rod-shaped or ball-shaped pulverizing medium for finely pulverizing the coarsely crushed shell.

With this configuration, in addition to the operation of any one of claims 1 to 3, the following operation is provided.
(1) When rod-shaped or ball-shaped grinding media that move irregularly within a vibrating cylinder that vibrates by driving of a vibrator collide with each other, or when a grinding medium collides with the inner wall of the vibrating cylinder, The input workpiece can be finely pulverized by the impact caused by the collision.
(2) Since the collision is repeated while the pulverization medium moves in the entire pulverization cylinder, the pulverization speed is particularly high in the fine region, the workpiece can be finely pulverized in a short time, and processing per unit time The amount can be increased.
(3) The workpiece to be processed can be repeatedly pulverized by the impact of the collision of the rod-shaped or ball-shaped pulverizing medium while moving the charged workpiece from the inlet side to the outlet side in the grinding cylinder. Processed products can be finely pulverized, and by applying impacts to shells that are harder than glass, etc. Can be increased.
(4) A coarse pulverizer is provided, and the object to be treated can be coarsely pulverized to a particle size of, for example, 30 mm or less by the coarse pulverizer, and the coarsely pulverized product is charged into the vibration mill. Therefore, it is possible to improve the yield of the pulverized material in the fine region in the vibration mill and to finely pulverize the material to be processed in a short time.
(5) After roughly pulverizing the workpiece with a coarse pulverizer, it is finely pulverized with a vibration mill, so it can be finely pulverized without reducing the amount of processing per unit time, and the yield of fine granular materials It is possible to obtain a large amount of shell particles having a particle size suitable for use in an inorganic foam composition.

Here, as a vibration mill, a pulverizing medium is loaded into a cylindrical or trough-shaped pulverizing cylinder, the pulverizing cylinder is vibrated by a vibration exciter, and is put into the pulverizing cylinder by an impact caused by the collision of the pulverizing medium. What grind | pulverizes the to-be-processed object is used. As a grinding medium loaded into the grinding cylinder of the vibration mill, a rod-shaped or ball-shaped medium is used, and a plurality of rod-shaped or ball-shaped grinding media are loaded into the grinding cylinder. The material, size, and filling rate of the grinding medium loaded in the grinding cylinder are preferably selected as appropriate depending on the type of the object to be processed.
In addition, as the coarse pulverizer, a coarse crusher such as a hammer mill, a hammer crusher, a roller mill, or a jaw crusher, or an intermediate crusher is used.

  In addition, a conveyance path for supplying a constant amount of the workpiece to the vibration mill can be provided. As the transport path, it is preferable to use a belt feeder, a vibration feeder, a screw conveyor, or the like that can adjust the supply amount. Moreover, a conveyance path by pneumatic transportation such as an injection feeder or an air slide can also be used. By adjusting the input amount of the workpiece into the vibration mill using the conveyance path, the residence time of the workpiece in the vibration cylinder of the vibration mill can be adjusted. The yield of the fine region of the product can be adjusted. If the input amount is increased, the yield of the fine region, for example, having a particle size of 250 μm or less is lowered, and if the input amount is decreased, the yield of the fine region can be increased.

As described above, according to the shell powder manufacturing system of the present invention, the following advantageous effects can be obtained.
According to the invention of claim 1,
(1) Since the material to be processed is dried in a dryer before being pulverized in the pulverizer unit, and the dried product is pulverized in the pulverizer unit, the processing amount of the pulverizer unit is set to a desired processing amount. It is possible to provide a shell powder production system that can be arbitrarily set.
(2) Manufacture of shell powder that prevents the pulverized product from being viscous due to moisture contained therein, prevents the pulverized product from sticking or clogging in the pulverizing unit, etc., and prevents a reduction in processing capacity. A system can be provided.
(3) Since the first dust collector that collects a large amount of dust generated in the dryer is provided, the generated dust is prevented from being discharged to the outside atmosphere, and 0.01 μm to 50 μm, preferably 0.8. It is possible to provide a shell powder manufacturing system capable of efficiently collecting fine powder of 1 μm to 10 μm with the first dust collector.
(4) After pulverization in the pulverizer unit, the powder is classified into fine powder and coarse powder with an airflow classifier, and among the selected shell powder, a shell powder having a particle size of 0.01 μm to 50 μm, preferably 0.1 μm to 10 μm. Can be collected by the second dust collector and the coarse powder can be sorted by a sieve classifier, so that a large amount of shell powder having a particle size suitable for use as an inorganic foam composition can be obtained for each particle size. It is possible to provide a shell powder production system that can be obtained.
(5) Adjust the flow rate of the dust-containing gas with the flow rate adjustment valve and adjust the amount of fine powder of 10 μm or less in the first dust collector and / or the second dust collector to recover in the sieve classifier. It is possible to provide a shell powder manufacturing system capable of adjusting the particle size and particle size distribution of the powder.
(6) Since the amount of fine powder in the shell put into the pulverizer and sieve classifier can be adjusted by adjusting the opening of the flow control valve, efficient pulverization and classification are performed. It is possible to provide a shell powder manufacturing system capable of performing the above.
(7) Since the return flow path is provided, the pulverized product pulverized in the pulverizer unit can be returned to the pulverizer unit to be pulverized again and pulverized again. It is possible to provide a shell powder production system capable of efficiently obtaining a fine powder of.

According to invention of Claim 2, in addition to the effect of Claim 1,
(1) It is possible to provide a shell powder manufacturing system excellent in dust removal property that can prevent dust generated in a dryer, a pulverizer, or the like from being scattered outside by a sealed conveyance path or dust scattering prevention cover. .
(2) Manufacture of shell powder that can prevent the entry of wind and rain, moisture, etc. into the transport path and keep the shell in a dry state, and can smoothly pulverize and classify the shell in the pulverizer and classifier. A system can be provided.

According to invention of Claim 3, in addition to the effect of Claim 1 or 2,
(1) Dust generated in the crushing chamber of the crushing unit can be recovered by air transportation to the second dust collector through the dust collecting path for the crushing device, so that the generated dust is discharged to the outside atmosphere, etc. In addition, it is possible to provide a shell powder manufacturing system capable of efficiently collecting fine powder with the second dust collector.

According to invention of Claim 4, in addition to the effect of any one of Claims 1 to 3,
(1) Since the collision is repeated while the pulverization medium moves in the entire pulverization cylinder, the pulverization speed is particularly high in a fine region, the workpiece can be finely pulverized in a short time, and processing per unit time It is possible to provide a shell powder production system having a high processing capacity capable of increasing the amount.
(2) The workpiece to be processed can be repeatedly pulverized by the impact of the collision of the rod-shaped or ball-shaped pulverizing medium while moving the charged workpiece from the inlet port side to the outlet port side in the pulverizing cylinder. Processed products can be finely pulverized, and by applying impacts to shells that are harder than glass, etc. A shell powder production system that can be enhanced can be provided.
(3) Equipped with a coarse pulverizer, and the object to be treated can be coarsely pulverized to a particle size of, for example, 30 mm or less by the coarse pulverizer, and the coarsely pulverized product is charged into the vibration mill. There is provided a manufacturing system of shell powder that can improve the yield of pulverized material in a fine region in a vibration mill and can finely pulverize the material to be processed in a short time. be able to.
(4) After roughly pulverizing the workpiece with a coarse pulverizer, it is finely pulverized with a vibration mill, so it can be finely pulverized without reducing the amount of processing per unit time, and the yield of fine granular materials It is possible to provide a shell powder production system that can obtain a large amount of shell particles having a particle size suitable for use in an inorganic foam composition.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
(Embodiment 1)
FIG. 1 is a schematic diagram showing a shell powder manufacturing system according to the first embodiment.
In FIG. 1, reference numeral 1 denotes a shell powder manufacturing system according to the first embodiment, 2 denotes a workpiece input unit into which shells collected in a water intake channel or a water intake tank of a power plant are input, and 3 denotes a workpiece input Vibrating sieve disposed at the lower part of the discharge port of section 2, 5 is a magnetic sorting conveyor for transferring shells from which dust etc. have been removed by vibrating sieve 3, 6 is a magnetic sorting machine arranged on magnetic sorting conveyor 5, 8 is a transfer conveyor connected to the magnetic sorting conveyor 5, 9 is a drying storage section for storing shells transferred by the transfer conveyor 8, and 10 is a screw feeder connected to the discharge port of the drying storage section 9. An upstream feeder 11, 11 is a rotary dryer formed in a cylindrical shape into which a shell is introduced from the upstream feeder 10, 12 a is a hot air supply path connected to a substantially central portion of the rotary dryer 11, and 12 b is a rotation. From the downstream side of the dryer 11 The first dust collecting path connected to the first dust collector described above, 12c is a flow rate adjusting valve disposed in the first dust collecting path 12b, and 13 heats the blown air through the hot air supply path 12a. The hot air generator 14 is supplied to the rotary dryer 11, 14 is a blower for supplying air to the hot air generator 13, 15 is connected to the first dust collecting path 12 b, and the rotary dryer 11 contacts the shells and shells. A first dust collector that collects dust and the like generated by cracking of the air, 16 is an exhauster that exhausts clean air to the outside air, 17 is a downstream discharge unit that discharges the shells dried by the rotary dryer 11, 18 Is a workpiece conveyance path provided continuously to the downstream discharge unit 17, and 18 a is a dust scattering prevention cover that is covered by the workpiece conveyance path 18.

  Reference numeral 20 denotes a crushing reservoir for storing the shells supplied from the workpiece conveyance path 18, 21 denotes a coarse crushing apparatus conveyance path connected to the discharge port of the crushing storage section 20, and 22 denotes a coarse crushing apparatus conveyance. A coarse pulverizing apparatus for coarsely pulverizing the shells supplied from the passage 21, 23 is a vibration mill conveying path connected to the discharge port of the coarse pulverizing apparatus 22, and 24 is coarsely pulverized supplied from the vibration mill conveying path 23. A vibration mill for finely pulverizing the shell, 25 a classifier conveying path connected to the discharge port of the vibration mill 24, and 26 a finely pulverized finely crushed shell supplied from the classifier conveying path 25 An airflow classifier such as a cyclone that sorts an object using an airflow, 26a is a blower that sends air to the airflow classifier 26, and 26b is a coarse powder conveyance path that is connected to a coarse powder outlet of the airflow classifier 26. , 26c are supplied from the coarse powder conveyance path 26b. A sieve classifier for selecting powder according to its particle size, 26d is a powder having a particle size larger than a predetermined particle size among the powders connected to the vibration mill 24 from the sieve classifier 26c and selected by the sieve classifier 26c. Is a return flow path that returns to the vibration mill 24, 27 is a second dust collector that collects dust from the crushing reservoir 20, the coarse pulverizer 22, and the airflow classifier 26, and 28 is an exhauster that discharges clean air to the outside air. , 29 is a second dust collection path connected from the second dust collector 27 to the fine powder discharge port of the airflow classifier 26, and 29a is from the pulverization reservoir 20 and the coarse pulverization apparatus 22 to the second dust collection path 29. The connected dust collecting passage 29c is a flow rate adjusting valve disposed in the second dust collecting passage 29, and A is a grinding device section.

As the rotary dryer 11, a fixed amount of the object to be processed is introduced into the rotary dryer 11 from the upstream feeder 10 connected to one end, and moved to the other end while drying, and discharged downstream on the other end. A continuous rotary kiln or the like discharged from the section 17 is used.
As the first dust collector 15 and the second dust collector 27, a bag filter, an electric dust collector, an air filter or the like is used.
Since the heated dust-containing gas is introduced into the first dust collector 15, when a bag filter or the like is used as the first dust collector 15, the temperature for the dust-containing gas in the first dust collecting path 12b is used. A detection unit (not shown) is provided, and the heating unit of the hot air generator 13 is controlled so that the temperature of the dust-containing gas detected by the temperature detection unit does not exceed a predetermined temperature, for example, 130 ° C. Thereby, it can prevent that hot gas flows in into the 1st dust collector 15, and can protect a filter member.
In addition, as the coarse pulverizer transport path 21, the vibration mill transport path 23, the classifier transport path 25, and the coarse powder transport path 26b, it is preferable to use a sealed one such as a screw conveyor. Can be prevented.
The pulverizer unit A includes a coarse pulverizer 22 and a vibration mill 24. The details of the coarse pulverizer 22 and the vibration mill 24 will be described later.
As the return flow path 26d, a mechanical transport device such as a screw conveyor or a pipe-type air transport device is used.

The operation of the shell powder manufacturing system 1 according to the first embodiment configured as described above will be described with reference to FIG. In the first embodiment, a case where oyster shells, mussel shells, barnacles and the like recovered from a water intake channel or water intake tank of a power plant are used as shells crushed by the shell powder manufacturing system 1 will be described. .
First, as a pretreatment before pulverization or the like in the shell powder production system 1, earth and sand deposited on the bottom of the water intake tank are collected and separated into earth and sand and shells by a trommel type sorter or the like. The separated shells are washed away with attached salt. In this way, collection, fractionation, and desalting of the object to be processed are performed as pretreatment.
In the shell powder manufacturing system 1, as shown in FIG. 1, the desalted shell is put into the workpiece input unit 2 of the shell powder manufacturing system 1. From the shells that have been put in, dust larger than the opening of the sieve is removed by the vibrating screen 3 at the bottom of the workpiece input unit 2. Here, the opening of the vibration sieve 3 is set to about 10 mm to 100 mm. Moreover, the workpiece input part 2 is provided with the vibration sieve 3 in the lower part, so that the shell can be smoothly discharged by the vibration. Subsequently, the shell is put into a magnetic sorting conveyor 5 and conveyed, and iron scraps and the like mixed into the shell are separated by magnetic sorting by a magnetic sorter 6 provided in the middle of the shell. The shells from which iron scraps and the like are separated are transported by the transfer conveyor 8 and put into the drying storage unit 9.
A certain amount of the shell put in the drying storage unit 9 is continuously fed into the rotary dryer 11 of the drying unit 16 by the upstream feeder 10 per unit time. The rotary dryer 11 has a cylindrical drying chamber rotatably supported by a guide (not shown), and is inclined to the downstream by about 1 to 5 degrees, and is rotationally driven by a drive unit (not shown). Transfer downstream while stirring and drying. The outside air or the like sent from the blower 14 is heated in the hot air generator 13, passes through a hot air supply path 12 a connected to the rotary dryer 11, and rotates from the center of rotation on the side of the rotary dryer 11 to the drying chamber. It is blown into.

The hot air sent into the rotary dryer 11 dries the shell, and is collected from the downstream side of the rotary dryer 11 through the first dust collecting passage 12b and discharged from the exhaust fan 16. In the first dust collector 15, dust-containing gas containing dust in the rotary dryer 11 is introduced, and shell dust with a particle diameter of 0.1 μm to 10 μm in the dust-containing gas is collected by a filter cloth. At this time, the flow rate of the dust-containing gas can be controlled by the flow rate adjusting valve 12c disposed in the first dust collecting passage 12b. Thereby, if the opening degree of the flow control valve 12c is adjusted so that the recovered amount of fine powder of 0.1 μm to 10 μm accompanying the airflow by the first dust collector 15 is increased, the crushing storage unit 20 and the crushing device unit The amount of fine powder in the shell put into A can be reduced, and the sticking of the powder to the inner wall of the hopper of the crushing reservoir 20 and the crushing chamber wall of the crushing unit A can be suppressed. If the opening of the flow rate adjustment valve 12c is adjusted so that the amount of fine powder recovered from 0.1 μm to 10 μm of the dust collector 15 is reduced, the amount of fine powder recovered by the sieve classifier 26c can be increased. The particle diameter and particle size distribution of the finally obtained shell powder can be adjusted while performing efficient and smooth discharge and pulverization.
In addition, the gas (clean air) from which the dust discharged from the exhaust fan 16 is removed can be circulated and reused by sending it to the hot air generator 13 as it is.

The shells dried in the rotary dryer 11 and transferred to the downstream side are discharged from the downstream discharge unit 17 and put into the workpiece conveyance path 18. The shell is transported through the workpiece transport path 18 and is put into the crushing reservoir 20. The shells put into the crushing storage unit 20 are put into the coarse crusher conveyance path 21 and conveyed, and then put into the coarse crusher 22. In addition, the shell can be stored in the crushing storage unit 20 for a predetermined time and cooled.
The shell is coarsely pulverized by the coarse pulverization apparatus 22, discharged as a coarsely pulverized product having a particle size of 30 mm or less, put into the vibration mill conveyance path 23, conveyed, and charged into the vibration mill 24. The coarsely pulverized product charged into the vibration mill 24 is finely pulverized in the vibration mill 24, discharged as a finely pulverized product having a particle size of about 10 μm to 3000 μm, and then input into the classifier transport path 25 to be transported. 26.
In the airflow classifier 26, the finely pulverized material of the shell shell introduced is sorted into fine powder and coarse powder by the swirling airflow of air introduced from the blower 26a, and the coarse powder is sieved by the coarse powder conveyance path 26b. And sorted according to particle size. Of the powder selected by the sieve classifier 26c, the powder having a particle size larger than 1000 μm, for example, is mechanically transported or pneumatically transported through the return flow path 26d, and is put into the vibration mill 24 and pulverized again. Further, the fine powder selected in the airflow classifier 26 is collected by the second dust collector 27 through the second dust collecting passage 29. Further, the second dust collector 27 sucks the dust-containing gas generated in the grinding chamber of the grinding storage unit 20 and the coarse grinding device 22 by the exhaust fan 28 through the dust collecting passage 29a for the grinding device, and converts it into the dust-containing gas. Dust contained can be recovered. At this time, the flow rate of the dust-containing gas can be controlled by the flow rate adjusting valve 29b disposed in the second dust collecting passage 29. Thereby, for example, if the opening degree of the flow rate adjustment valve 29b is adjusted so that the amount of fine powder of 0.1 μm to 10 μm collected by the second dust collector 27 is increased, the shell in the shell put into the sieve classifier 26c The amount of the fine powder becomes small, and efficient classification can be performed while suppressing clogging of the sieve.
Further, in the sieve classifier 26c, the input coarse powder is classified for each particle size, and powders having a uniform particle size, for example, 10 μm to 100 μm powder and 100 μm to 1000 μm powder are obtained.

Next, the configuration of the coarse pulverization apparatus 22 and the pulverization operation thereof will be described in detail with reference to FIG.
FIG. 2 is a side sectional view of a main part of the coarse pulverizing apparatus 22.
In FIG. 2, 21 is a coarse pulverizer conveyance path, 22 is a coarse pulverizer, 23 is a vibration mill conveyance path, 29 is a pulverizer dust collecting path, 30 is a coarse pulverization chamber formed in a cylindrical shape, and 31 is A pulverized material recovery chamber disposed below the coarse pulverization chamber 30 and formed in a cylindrical shape, 32 is a bottom portion of the pulverized material recovery chamber 31, 33 is a discharge port for the pulverized material formed in the bottom portion 32, and 34 is a number of outlets. A perforated bottom plate 35, which is a screen having a hole and detachably disposed between the coarse pulverization chamber 30 and the pulverized product recovery chamber 31, penetrates through substantially the center of the coarse pulverization chamber 30 and the pulverized product recovery chamber 31. The drive shaft 36 disposed in this manner is fixed to the lower end of the drive shaft 35 and is disposed so as to be in sliding contact with the bottom 32 of the pulverized material collection chamber 31, and 37 is a drive in the coarse pulverization chamber 30. A housing part 38 disposed on the outer periphery of the shaft 35 and connected to the drive shaft 35, 38 is a housing. A roller rotation shaft connected to the support portion 37 (not shown), an arm 47 and a swing shaft 48, and a crushing roller 40 rotatably fitted to the roller rotation shaft 38; Is a grinder composed of a prismatic column formed in a double row on the outer peripheral surface of the crushing roller 39 with a predetermined phase difference, and 42 is a drive unit connected to the drive shaft 35 and disposed on the upper surface of the ceiling of the coarse crushing chamber 30. , 43 are coarse pulverization inlets opened in the ceiling of the coarse pulverization chamber 30.

Here, a support shaft (not shown) is fixed to the housing portion 37 at right angles to the drive shaft 35, and an arm 47 is fixed to the support shaft at right angles. 48 is pivotally supported so as to be swingable up and down, and a roller rotation shaft 38 is fixed to the tip of the swing shaft 48 at right angles. As the swing shaft 48 swings up and down, the grinding roller 39 supported by the roller rotation shaft 38 swings up and down.
The diameter of the hole of the porous bottom plate 34 is preferably set to 5 mm to 30 mm. As the shell is set to 5 mm or less, the shells slip and do not easily escape and pulverize, and the pulverization amount per unit time tends to decrease, and as it is set to 30 mm or more, the pulverization amount per unit time can be increased. This is not preferable because the particle size of the product tends to increase and the yield of fine granular materials tends to decrease in the vibration mill 24.

The pulverization operation of the coarse pulverization apparatus 22 configured as described above will be described below with reference to FIG.
First, as the drive shaft 35 rotates by the drive unit 42, the crushing roller 39 connected to the drive shaft 35 circulates around the drive shaft 35. Further, the crushing roller 39 rotates around the roller rotation shaft 38 as it goes around. When a shell is introduced into the coarse pulverization chamber 30 from the coarse pulverization inlet 43, the pulverizer 40 of the pulverization roller 39 pulverizes so as to step over the object to be processed by the rotation and rotation of the pulverization roller 39. . Further, since the crushing roller 39 is pivotally supported so as to be able to swing up and down, the grinding roller 39 swings up and down on the porous bottom plate 34. When a large amount of processing object is loaded, the grinding roller 39 rides on the loaded processing object. While rotating around and rotating, crush.
After the shell put in the coarse pulverization chamber 30 is crushed until the size of the hole of the porous bottom plate 34 becomes smaller than the size, the coarsely pulverized product falls from the hole of the porous bottom plate 34 to the pulverized product recovery unit 31. The pulverized material recovery scraper 36 rotates around the drive shaft 35 as the drive shaft 35 rotates, and scrapes the coarsely pulverized material that has fallen to the bottom 32 of the pulverized material recovery chamber 31 into the discharge port 33. Since the vibration mill conveyance path 23 is connected to the discharge port 33, the coarsely pulverized product is continuously conveyed to the next vibration mill 24. Further, a dust collecting passage 29 for the grinding device is connected to the casing of the coarse grinding chamber 30, and dust generated in the coarse grinding chamber 30 is collected by the second dust collector 27 through the dust collecting passage 29 for the grinding device. .

Next, the configuration of the vibration mill 24 and the crushing operation thereof will be described in detail with reference to FIG.
FIG. 3 is a partial sectional front view of the vibration mill 24.
In FIG. 3, reference numeral 23 is a vibration mill conveyance path, 24 is a vibration mill, 25 is a classification apparatus conveyance path, 50 is a pulverization cylinder of the vibration mill 24 formed in a cylindrical shape, and 51 is formed in the pulverization cylinder 50. A fine crushing chamber 52 is an opening / closing part that can be freely opened and closed by hinges described later on both sides of the crushing cylinder 50, 53 is a gripping part attached to the opening / closing part 52, and 54 is an upper part on one end side of the crushing cylinder 50. The fine pulverization input port 55 is opened, 55 is an input side bellows connecting the fine pulverization input port 54 and the vibration mill conveyance path 23 via the input connection pipe 55a, and 56 is the opposite of the fine pulverization input port 54 of the pulverization cylinder 50 The fine pulverization discharge port 57 formed in the lower part of the side, 57 is a discharge side bellows connecting the fine pulverization discharge port 56 and the classifier transport path 25, 58 is a lining lined on the inner wall of the fine pulverization chamber 51, 59 is fine A plurality of rods loaded in the grinding chamber 51 The grinding medium, 60 is a vibration exciter integrally connected and fixed to the lower part of the grinding cylinder 50, 61 is a plate-like connecting part for connecting the grinding cylinder 50 and the vibration exciter 60, and 61a is integrated with the connecting part 61. The vibration support portion 62 is supported by an elastic portion described later, 62 is a pedestal portion of the vibration mill 24, 63 is a support column portion erected on the pedestal portion 62, and 64 is an upper end portion of each support column portion 63. An elastic part made up of a coil spring that is disposed and supports the vibration support part 61a and swingably supports the grinding cylinder 50 and the vibration exciter 60, 65 is a lubricating oil supply that supplies lubricating oil to the motor shaft of the vibration exciter 60 A pipe 66 is an oil filler port.

Here, the capacity of the fine grinding chamber 51 is formed to be about 200L. The material of the lining 58 disposed on the inner wall of the pulverization cylinder 50 depends on the size and material of the pulverization medium 59 and the type of the object to be processed, but it is a high manganese steel material having wear resistance and impact resistance or SS400. Etc. are used.
As the grinding medium 59, a cylindrical rod-shaped or ball-shaped one is used. In the first embodiment, a rod-shaped grinding medium 59 having a diameter of 32 mm and a length of 1740 mm is used. A plurality of grinding media 59 were used so that the total weight was 720 kg.
The vibration exciter 60 incorporates a motor and an eccentric weight fixed to the motor shaft, and vibrates itself by rotating the eccentric weight by rotationally driving the motor. The fine grinding chamber 51 is vibrated. In the first embodiment, the vibration amplitude of the vibrator 60 is set to about 7 mm at the maximum and the vibration frequency is set to about 16 to 18 Hz.

The grinding operation of the vibration mill 24 configured as described above will be described below with reference to FIG.
First, when the shaker 60 is driven, the shaker 60 vibrates integrally with the fine grinding chamber 51 connected by the connecting portion 61. As a result, the grinding chamber 50 vibrates and moves irregularly so that the plurality of rod-shaped grinding media 59 accommodated in the fine grinding chamber 51 jump in the fine grinding chamber 51.
The coarsely pulverized material conveyed in the vibration mill conveyance path 23 is introduced into the fine pulverization chamber 51 from the fine pulverization inlet 54. The coarsely pulverized material that has been charged is sandwiched between the crushing media 59 that move irregularly, or the crushing media 59 collides with the lining 58 on the inner wall of the fine crushing chamber 51, It is pulverized by impact. The coarsely pulverized product that has been charged moves in the fine pulverization chamber 51 while being pulverized from the fine pulverization charging port 54 side to the fine pulverization discharge port 56 side by the vibration of the fine pulverization chamber 51. When the coarsely pulverized product is finely pulverized to become a finely pulverized product and reaches the fine pulverization discharge port 56, the coarse pulverized product falls and is discharged from the fine pulverization discharge port 56, and is classified by the classifier conveying path 25 via the discharge side bellows 57. 26.
It is to be noted that the amount of coarsely pulverized material and the amount of conveyance of the vibration mill conveyance path 23 are adjusted as appropriate, and the amount of coarsely pulverized material introduced into the vibration mill 24 is adjusted and introduced, whereby the object in the vibration cylinder 50 is increased. Since the residence time of the processed product can be adjusted and finely pulverized, the yield of fine regions of the finely pulverized finely pulverized product, for example, 250 μm or less can be adjusted. If the feeding amount is increased by adjusting the vibration mill conveyance path 23, the yield of the fine region is lowered, and if the feeding amount is reduced, the yield of the fine region can be increased. In this Embodiment 1, it set so that the yield of the granular material with a particle size of 250 micrometers or less might be at least 60 weight% or more.

As described above, the shell powder manufacturing system 1 according to the first embodiment is configured, and thus has the following operations.
(1) Since the processed material can be dried by the rotary dryer 11 before being pulverized in the coarse pulverizer 22 or the vibration mill 24, the water content of the processed material can be reduced to about 0% to 2%. The coarsely pulverized product and finely pulverized product can be prevented from having viscosity due to moisture contained therein, and the coarse pulverization device 22 and the vibration mill 24 can prevent the pulverized product from sticking or clogging, thereby preventing a reduction in processing capacity. .
(2) Since the material that has been reliably dried by the rotary dryer 11 is pulverized by the pulverizer unit A, the processing amount of the pulverizer unit A can be arbitrarily set to a desired processing amount, and a large amount can be obtained from the intake channel. It is possible to reliably process the shells that are generated.
(3) Since the hot air supply path 12a is connected to the substantially central portion of the rotary dryer 11, the hot air can be applied to the entire shell in the process of sending the shell to the downstream side while stirring the shell, and the drying efficiency is improved. Can be increased.
(4) Hot air generated by the hot air generator 13 is supplied to the rotary dryer 11 from the hot air supply path 12a to dry the object to be processed in the rotary dryer 11, and then the dust-containing gas is supplied to the first dust collector 15. It collect | recovers by and collects the dust of 0.1 micrometer-10 micrometers contained in it, and can use the collected dust as an inorganic type foam composition.
(5) After the shell is pulverized in the pulverizer A, it is classified into fine powder and coarse powder by the airflow classifier 26, and among the selected fine powder, 0.1 μm to 10 μm are collected by the second dust collector 27. In addition, the coarse powder can be sorted into, for example, those having a particle size of 100 μm to 1000 μm or less and those having a particle size of 10 μm to 100 μm or less with the sieve classifier 26 c, so that it is suitable for use as an inorganic foam composition. A large amount of shell powder with different particle sizes can be obtained for each particle size.
(6) Since shell powder having a particle size of 0.1 μm to 10 μm can be collected by the first and second dust collectors 15 and 27, the equipment load and man-hours can be reduced, and when used as an inorganic foam composition The shell powder is uniformly dispersed and open cells are easily formed, and a large amount of shell powder suitable for the inorganic foam composition can be efficiently recovered.
(7) Since the flow rate adjusting valves 12c and 29b are disposed in the first dust collecting path 12b and the second dust collecting path 29, the flow rate of the dust-containing gas is appropriately adjusted by the flow rate adjusting valves 12c and 29b. By adjusting the amount of fine powder recovered in the first dust collector 15 and / or the second dust collector 27, the amount of fine powder in the shell put into the coarse pulverizing device 22 and the vibration mill 24 can be adjusted efficiently. While performing proper pulverization, the particle size and particle size distribution of the powder recovered in the sieve classifier 26c can be changed according to what is desired.
(8) The coarse pulverizer 22 of the pulverizer unit A rotates the drive shaft 35 by the drive unit 42, thereby rotating the pulverization roller 39 around the drive shaft 35 and rotating around the roller rotation shaft 38, The object to be processed put in by the pulverizer 40 of the pulverizing roller 39 can be pulverized, and only the pulverized material having a particle diameter of 5 mm to 30 mm that has passed through the holes of the porous bottom plate (screen) 34 enters the pulverized material recovery chamber 31. Since it falls, a to-be-processed object can be reliably grind | pulverized to the particle size of 30 mm or less. Since the pulverized product has an extremely low water content, the pulverized product is excellent in fluidity, and the coarsely pulverized product dropped into the pulverized product recovery chamber 31 is recovered by the pulverized product recovery scraper 36 and smoothly discharged from the discharge port 33. The object to be processed that is put into the vibration mill 24 is only a granular material having a particle size of 30 mm or less separated by the porous bottom plate (screen) 34 of the coarse pulverizer 24. And can be finely pulverized.
(9) The vibration mill 24 of the pulverizing unit A is configured such that the pulverizing media 59 collide with each other in the fine pulverizing chamber 51 that is vibrated by the drive of the vibration exciter 60 or the pulverizing media 59 is fine. By colliding with the lining 58 on the inner wall of the crushing chamber 51, the coarsely pulverized product that has been put in between is pulverized by the impact, and the pulverized product can be finely pulverized by repeatedly performing the collision. . In addition, the coarsely pulverized material that has been charged is moved from the fine pulverization input port 54 side to the fine pulverization discharge port 56 side in the fine pulverization chamber 51 by the vibration of the fine pulverization chamber 51, while moving over the entire length of the rod-shaped pulverization medium 59. Thus, impact can be repeatedly applied and finely pulverized, and the powder can be discharged from the finely pulverized discharge port 56 as it is. Since the object to be processed put into the vibration mill 24 is a coarsely pulverized product that has already been coarsely pulverized to a predetermined particle size or less by the coarse pulverizer 22, it can be finely pulverized in a short time in the vibration mill 24. Without reducing the amount of processing per hour, it can be finely pulverized to increase the yield of fine particles, and a large amount of particles having a particle size suitable for use in inorganic foam compositions can be obtained. be able to.
(10) By adjusting the input amount of the coarsely pulverized product to the vibration mill 24, the residence time of the object to be processed in the vibration cylinder 50 can be adjusted and finely pulverized. The yield of the fine region of the finely pulverized product, for example, 250 μm or less can be adjusted, and the object to be processed can be finely pulverized in the vibration mill 24 in a short time.
(11) Since the return flow path 26d is provided, the pulverized product pulverized by the coarse pulverization apparatus 22 and the vibration mill 24 is returned to the vibration mill 24 and pulverized again with a particle size of, for example, 100 μm to 1000 μm. can do.
(12) Dust generated by crushing shells in the crushing chamber storage unit 20 and the coarse crushing chamber 30 of the coarse crushing device 22 by the second dust collector 27 is removed from the dust collecting passage 29a for the crushing device by the second dust collector 27. Since it can collect | recover, it is excellent in dust removal property, and the collect | recovered dust of 0.1 micrometer-10 micrometers can be utilized as an inorganic type foam composition.

  As described above, the present invention relates to a shell powder manufacturing system for processing a shell recovered in a water intake or the like of a power plant to obtain a shell powder suitable for an inorganic foam composition. According to the above, shell powder having a particle size suitable for use as an inorganic foam composition can be obtained in a large amount by sorting for each particle size, and in particular, the yield of fine powder can be significantly increased. In addition, it is possible to provide a shell powder manufacturing system capable of changing the particle size range and particle size distribution of the obtained powder as necessary.

Schematic diagram showing a shell powder manufacturing system in the first embodiment Side cross-sectional view of main parts of coarse pulverizer Partial sectional front view of vibration mill

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Shell powder manufacturing system 2 Processing object input part 3 Vibrating sieve 5 Magnetic sorting conveyor 6 Magnetic sorting machine 8 Transfer conveyor 9 Drying storage part 10 Upstream feeder 11 Dryer 12a Hot-air supply path 12b 1st dust collection path 12c Flow control valve 13 Hot air generator 14 Blower 15 First dust collector 16 Ventilator 17 Downstream discharge unit 18 Processed object conveyance path 20 Crushing reservoir 21 Coarse pulverization apparatus conveyance path 22 Coarse pulverization apparatus 23 Vibration mill conveyance path 24 Vibrating Mill 25 Classifier Transport Path 26 Airflow Classifier 26a Blower 26b Coarse Powder Transport Path 26c Sieve Classifier 26d Return Channel 27 Second Dust Collector 28 Air Drainer 29 Second Dust Collector 29a Crusher Collection Dust path 29b Flow rate adjusting valve 30 Coarse grinding chamber 31 Crushed material collection chamber 32 Bottom 33 Discharge port 34 Porous bottom plate (screen)
35 Drive shaft 36 Crushed material recovery scraper 37 Housing portion 38 Roller rotating shaft 39 Grinding roller 40 Grinding element 42 Drive portion 43 Coarse grinding input port 47 Arm 48 Oscillating shaft 50 Grinding cylinder 51 Fine grinding chamber 52 Opening and closing portion 53 Grip portion 54 Fine Pulverization inlet 55 Input side bellows 55a Input connection pipe 56 Fine pulverization discharge port 57 Output side bellows 58 Lining 59 Grinding medium 60 Exciter 61 Connection part 61a Vibration support part 62 Base part 63 Support column part 64 Elastic part 65 Lubricant supply Pipe 66 Refueling port A Grinding unit

Claims (4)

A shell powder production system for producing shell powder used as a raw material for an inorganic foam,
A dryer for drying the shells that have been introduced;
A first dust collector connected to the dryer via a first dust collecting path and collecting shell powder having a particle size of 0.01 μm to 50 μm, preferably 0.1 μm to 10 μm;
A pulverizer unit including one or more pulverizers for pulverizing the dried shell;
An airflow classifier for classifying the crushed shell powder;
A second dust collector connected to the fine powder outlet of the airflow classifier through a second dust collecting path and collecting shell powder having a particle size of 0.01 μm to 50 μm, preferably 0.1 μm to 10 μm;
A flow rate adjusting valve disposed in the first dust collection path and / or the second dust collection path;
A sieve classifier connected to the coarse powder outlet of the airflow classifier;
A return flow path for returning shell powder larger than a predetermined particle diameter to the pulverizer unit among the shell powders selected from the sieving classifier and connected to the pulverizer unit from the sieve classifier;
A shell powder production system comprising:   2. The apparatus according to claim 1, further comprising: a conveying path that connects each of the dryer, the pulverizer unit, and the airflow classifier, and is sealed or covered with a dust scattering prevention cover. Shellfish powder production system.   The shell powder manufacturing system according to claim 1 or 2, further comprising a dust collecting passage for the crushing device connected to the second dust collector from one or more crushing devices of the crushing device section. . The pulverizer unit includes a coarse pulverizer for coarsely pulverizing the shells dried by the dryer, and a vibration mill using a rod-shaped or ball-shaped pulverizing medium for finely pulverizing the coarsely crushed shells. The shell powder manufacturing system according to any one of claims 1 to 3, further comprising:

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