JPS6384628A - Storage apparatus - Google Patents

Abstract

PURPOSE:To prevent the compact conglomeration of granular molded articles by once holding the granular molded articles which are obtained by humidifying and molding fine particles contg. substance forming hydrated salt in a receptacle and thereafter rotating the receptacle and allowing the granular molded articles held on the receptacle to fall into a storage part. CONSTITUTION:Granular molded articles which are obtained by humidifying and molding fine particles contg. substance forming hydrated salt such as cement are fed into a receptacle 1 through a feed port 3 and once held on a pan 6. After fixed time elapses and solidification is advanced with some degrees, the pan 6 is rotated and slanted at about 50-70 deg.C i.e. to the left with a horizontal rotary shaft 5. At this time, the pan 6 is preferably positioned so that it is made to an introduction chute for a storage tank 7. The granular molded articles held on the pan 6 are slid and introduced into the left storage tank 7 through an introduction port 8 via a left discharge port 4. Thereby compact conglomeration and the generation of a bridge in the storage tank 7 can be prevented by once receiving the granular molded articles in the receptacle 1 and aging them to some degree.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is directed to the formation of hydrated salts when a substance mainly consisting of fine particles is solidified into granular solids and discharged using a hydrated salt growth reaction. Related to improvement of a storage device that stores a granular molded product obtained by humidifying and molding fine particles containing a substance, performs a hydrated salt growth reaction, transforms the granular molded product into solidified granules, and discharges the granular solid. It is.

In particular, in a storage device, a substance consisting mainly of dry or low water content fine particles is shaped into granules and solidified using the growth reaction of hydrated salts such as cement, calcium salts, magnesium salts, etc. The fine particles that are targeted include, for example, municipal waste, waste such as sewage sludge, ash of solid fuels such as coal, park, bagasse, and waste wood, and various exhaust gases. Examples include sludge and dust discharged during wastewater treatment and wastewater treatment processes.

[Problems to be solved by the conventional technology and invention] Ash, sludge, dust, etc. as mentioned above, if left as is, generate heavy dust when loaded onto a vehicle for transportation or unloaded at a final disposal site. , they may flow out or stick to each other, or they may be blown up by the wind at the final disposal site. Also,
There are also concerns about environmental pollution if they contain hazardous substances such as heavy metals and organic chlorine compounds.

Therefore, recently, as a means to solve these problems, cement and other hydrated salt-forming substances (hereinafter simply "
It is beginning to be adopted to mix it with cement (referred to as "cement"), form it into granules, and then discharge it.

In other words, cement is added to the target substance, which consists mainly of fine particles, but it may contain calcium salts or magnesium salts as a component in advance, and solidify by causing a hydrated salt growth reaction when water is added. For example, without adding any cement, a hard slurry is formed into a granular product through humidification, kneading, and molding processes, and then it is cured to undergo a hydrated salt growth reaction, so that it can withstand the handling involved in transportation to some extent. , to the extent that it maintains the desired durability even when exposed to the elements at the final disposal site.
It is transported out after the solidification reaction has progressed. This humidification varies depending on the diameter and type of fine particles, the granulation method, the water-soluble salt content, etc., but it is usually about 8 to 30% by weight, and about 12 to 20% if you want to suppress adhesion and eruption. It is recommended to keep the water content at 100%, and this has also been confirmed experimentally.

By the way, even though it is simply curing, it is a granular molded product of hard muddy material immediately after the molding process, and since the grains are wet and soft, they stick to each other. If this granular molded product is simply charged and stored in the storage section, it will be thrown into the storage section before it has solidified sufficiently, and the granular molded products will adhere to each other in the storage section and become compacted and aggregated. happens. This tendency is particularly strong in rolling granulation molding, because in principle water seeps onto the surface of the granular molded product. This is likely to occur if the amount of humidifying water is too large, but if it is too small, dust is likely to be generated, which becomes a problem.

When the granular molded products adhere to each other and form agglomerates, even if the entire bottom of the storage part has a bunker structure like a discharge gate, it becomes a so-called bridge state that cannot be discharged even if the bottom gate is opened, and in some cases, the entire bottom becomes one. will become a baby boom. Also, even if they are somehow ejected, large chunks weighing from several hundred kg to more than one ton will fall onto the vehicle loading platform, and the impact will damage the vehicle. Difficult to handle at disposal site.

Therefore, various measures have been conventionally taken for this purpose.

Once the solidification reaction has proceeded to some extent through the device, the solidification reaction may proceed to a certain extent, and then the particles are poured into the storage section.The adhesion of the particles to each other may not yet solidify due to the impact of the particles falling during the feeding. Another method is that the materials crumble or separate, break, and become piled up again, and since they have already solidified to some extent, they do not adhere to each other or form clumps as much.

For example, there is a method called a curing conveyor in which granular molded products are loaded on a wide conveyor belt that moves slowly or intermittently, and the solidification time is gained by the residence time on the belt.

However, this method requires a large conveyor and special movements, which increases costs and requires a large space. In addition, the adhesion of solidified particles to the belt cannot be avoided, causing severe damage, dirt and adhesion on return rollers, belt reversing parts, etc., making maintenance difficult and the work environment inevitably full of dust, which is not desirable. There wasn't.

In addition, as shown in FIG. 3, a sub-hopper 22 having an opening/closing gate 23 on the lower surface is connected above the storage tank 21, and the sub-hopper 22 once receives the granular molded product, and the gate rotating shaft 24 is rotated at regular intervals. In some cases, the granular molded product is dropped into the storage tank 21 by opening the opening and closing gates 23 alternately on the left and right sides, and the solidified granular solid is discharged by opening the discharge gate 26 by rotating the discharge gate rotating wheel 250 times.

According to this, a large belt conveyor is certainly unnecessary, but a cylinder for driving the gate rotation shaft 24 is required, and even though the storage tank 21 of the sub-hopper 22 is raised, the storage tank 21 It was not possible to increase the cross-sectional area, making it difficult to obtain a large storage capacity. Therefore, in order to increase the storage capacity, it is necessary to install multiple storage tanks, each with a sub-hopper, and connect each sub-hopper with a switching conveyor, and this switching conveyor also has the same problem as the curing conveyor described above. was there.

The present invention solves these various problems, prevents agglomeration when storing and solidifying granular molded products, eliminates the risk of bridging in the storage part, enables smooth discharge, and improves the storage tank. It is an object of the present invention to provide a storage device that can easily accommodate a plurality of storage tanks due to an increase in storage capacity, regardless of the type of storage section used.

[Means for solving problems]

The present invention is a storage device for molding and solidifying fine particles into granular solids using a hydrated salt growth reaction and discharging them, and supplies granular molded products obtained by humidifying and molding fine particles containing hydrated salt-forming substances. A receiving container having a mouth at an upper part, a discharge port at a lower part, and a receiving tray inside which receives a granular molded product supplied to the supply port and is rotatable by a horizontal rotation axis; a storage part having an input port and a discharge mechanism, the receiving container is disposed so that its discharge port can communicate with the input port of the storage part, and the granular molding on the receiving tray is performed by rotating the receiving tray. The present invention provides a storage device characterized in that the product is configured to fall into the storage section.

[For production]

With the configuration of the present invention as described above, the granular molded product obtained by humidifying and molding fine particles containing cement is supplied into the receiving container from the supply port, and after being received on the internal receiving tray for a certain period of time, it is placed on the horizontal rotating shaft. As a result of the rotation, the tray rotates and tilts, and the granular molded product slides from the discharge port through the input port into the storage section. In this manner, the receiving tray repeatedly holds the granular molded product for a certain period of time, rotates, and drops it into the storage section, and during this holding time, the particulate product initially supplied to the receiving container progresses to a certain degree of solidification.

As the granular molded products solidify while being held in the tray for a certain period of time, they undergo little deformation and lose a considerable amount of adhesion. There is little compaction or agglomeration in the reservoir, except for that which is broken up by the material and fed into the receiving vessel near the end of the holding period. Then, when it is discharged for transport, etc., it is easily broken up into pieces, making it easier to discharge, transport, and handle at the final disposal site, and also to suppress the generation of dust and the spread of harmful substances.

〔Example〕

An embodiment of the present invention will be described with reference to FIG.
Reference numeral 1 denotes a receiving container, which is provided with a supply port 3 at the top thereof, through which a granular molded product 2 obtained by humidifying and molding fine particles containing cement is provided, and a discharge port 4 is provided at the bottom. moreover,
Inside the receiving container 1, a granular molded product 2 is supplied from the supply port 3.
A receiving tray 6 is provided which receives the horizontal rotating shaft 5 and is fixed to the horizontal rotating shaft 5, and the horizontal rotating shaft 5 is attached with a rotating mechanism consisting of a rotational drive device (not shown) and a control system for its rotation.

Reference numeral 7 denotes a storage tank, and an input port 8 is opened in the upper part of the storage tank 7, and a discharge gate 10 that is rotated to be opened and closed by a discharge gate rotating shaft 9 is provided in the lower part.

Further, the receiving container 1 is installed above the storage tank 7 so that the outlet 4 of the receiving container 1 can communicate with the input port 8 of the storage tank 7, and the granular molded products on the receiving tray 6 are stored by rotating the receiving container 6. It is designed to fall into the tank 7. For example, as shown in the first illustrated example, when the tray 6 rotates and tilts, it is preferable to position the tray 6 so that it becomes a chute for introducing the granular molded product into the storage tank 7. By using itself as an inclined chute, the connection position between the receiving container 1 and the supply mechanism (not shown) to the supply port 3 and the charging position into the storage tank 7 can be separated, and a conveyor or the like can be used. It is also easy to set the input positions apart from each other.

Therefore, the number of storage tanks 7 may be one, but as shown in the example shown, two storage tanks 7 are installed in parallel, one for each of the two discharge ports 4, and the discharge ports 4 at the bottom of the receiving container 1 are provided on both sides. The discharge port 4 is connected to the input port 8 of each storage tank 7, and the tray 6 is connected to the horizontal rotation shaft 5.
By alternately rotating and tilting the receiving container 1 to the opposite side, it becomes possible to distribute the distribution to each storage tank 7, and further, the receiving container 1 is rotated by 906 or 60" around the vertical axis 11 passing approximately through its center. This makes it easy to distribute to 4 or 6 storage tanks.

Note that although a feeding mechanism for feeding the granular molded product 2 to the supply port 3 of the receiving container 1 is not shown, a conveying device such as a belt conveyor is required especially if the granular molding device is located at a distance. However, if the granule molded product outlet of the granule molding device is located directly above the receiving container 1, it is only necessary to attach a connecting chute.

Thus, the granular molded product 2 obtained by humidifying and molding fine particles containing cement is supplied into the receiving container 1 from the supply port 3 and is temporarily held on the receiving tray 6. Then, after a certain period of time has elapsed, before the receiving container 1 is full, for example, in the case of the left storage tank 7, the receiving tray 6 is rotated and tilted by the horizontal rotating shaft 5 by about 50 to 70'' to the left, so that the particles on the receiving tray 6 are The molded product is allowed to slide down by gravity and is fed into the left side storage tank 7 through the left side discharge port 4 and the input port 8. The same applies to the right side.

The rotation angle of the tray 6 must be greater than the angle at which the granular molded product on the tray 6 slides down due to gravity, but since it may stick to the tray 6 and be difficult to fall off, The surface on which it is placed needs to be coated or covered with, for example, Teflon, polyethylene, or other material with good releasability to make it easier to peel off.

If the particles are particularly prone to adhesion, it is desirable to apply the same treatment to all parts of the receiving container 1 that come into contact with the granular molded product. In some cases, if these parts are made of easily deformable materials such as soft plastic or rubber, the tray 6 etc. may be deformed and peeled off due to the movement of the load when tilting the tray 6. is completed, and the granular molded product is placed in a receiving container.
Even if it adheres because it is in a soft and wet state when it is supplied to the container, it will be solidified or dried to some extent by the time the tray 6 is tilted and the container 1 is discharged, and it will easily peel off due to the deformation of the tray 6, etc. It is effective because it is

The capacity of the receiving container 1 is determined by compaction in the storage tank 7 below.
In order to avoid agglomeration, it is necessary that the next granular molded product received immediately after the granular molded product is discharged must have a residence time that is at least long enough to lose its adhesion and deformability, and prevent hydrated salt growth. It is determined by the reaction rate and the molding processing speed of the granular molded product.

For example, if a special early-strengthening cement such as alumina cement is used, a short time of around 10 minutes is sufficient, but if the reaction rate is comparable to general Bortland cement, a residence time of at least 20 minutes to 1 hour or more is desirable. In order to accelerate the reaction rate and drying, hot air is supplied into the receiving container 1,
Ventilation is also desirable to reduce the volume and enhance the effect of preventing compaction.

In this way, the granular molded product that has been solidified or dried to some extent is cured in the storage tank 7 by further solidifying through hydrate salt growth reaction or drying, and then stored in preparation for transport. The discharge gate 10 is rotated by the discharge gate rotation shaft 9.
Open it, load it onto a vehicle, etc., and transport it.

If necessary, four or six storage tanks 7 may be arranged in parallel at approximately equal distances around the vertical axis 11, and the receiving container 1 may be placed in parallel with the vertical axis 11.
It is also possible to easily distribute the granular molded product to each storage tank 7 by rotating approximately 90° or 60″ around the center.

FIG. 2 shows another embodiment of the present invention. In the first illustrated example, the rotation of the tray 6 must be returned instantaneously after the granular molded product slides down, but in the second illustrated example, the rotation of the tray 6 is rotated around a horizontal rotation axis. 5
It is divided into three equal parts around the center, and the angle is 120° or 24
By intermittent rotation left and right by 0@, the tray 6 is switched at the same time as it is poured into the storage tank 7.

In this case, the lower part of the receiving container 1 is used as a connecting plate 12 that connects the left and right storage tanks 7. Of course, the tray 6 may be a flat plate and rotated by 180@. In this case, the driving force is an air cylinder, etc., and when the cylinder is stretched, it is put into one of the storage tanks 7, and the granular molded product is stored in the stretched state. After a certain period of time, when the cylinder contracts, it is put into the other storage tank 7, the granular molded product is received in the contracted state, and after a certain period of time, the cylinder is extended again. This has the advantage of being easy to control.

This example also exhibits almost the same effect as the first illustrated example, but
The angle of inclination of the tray 6 is vertical or more, so there is no fear that the granular molded product will remain on the tray 6. Incidentally, there is no problem even if the objects do not fall directly from the receiving tray 6 into the storage tank 7 but fall onto the connecting plate 12 because they are swept into the storage tank 7 by the tip of the rotating receiving tray 6.

As can be said for any of the above examples,
The storage tank 7 is not limited to the type shown, but may be one that is stored on an earthen floor and is scooped up and discharged with a shovel loader, or one that is stored in a pit that is loaded onto a vehicle for transport using a lane that runs with packets. Of course it's fine if it's something you do. It goes without saying that even in such a case, by distributing the feeding positions, a plurality of piles of stored granular molded products can be formed and the storage space can be effectively utilized.

〔Effect of the invention〕

As described above, according to the present invention, a granular molded product obtained by humidifying and molding fine particles containing cement is first received in a receiving container and solidified to some extent to reduce adhesiveness and deformability, and then placed in a storage part. Dropping prevents compaction and bridging of granular molded products in the storage area, and effectively prevents dust, improves handling, and prevents harmful substances.Furthermore, the tray is rotated by a shaft. As a result, the structure of the present invention is simple and compact, and distribution to a plurality of reservoirs is facilitated, making the present invention a significant contribution to the granular solidification process of fine particles.

[Brief explanation of the drawing]

1 and 2 are sectional views showing an embodiment of the present invention, and FIG. 3 is a sectional view showing a conventional example. DESCRIPTION OF SYMBOLS 1... Receiving container, 2... Granular molded product, 3... Supply port, 4... Discharge port, 5... Horizontal rotating shaft, 6... Receiver, 7... Storage tank, 8... Input port, 9... Discharge gate rotating shaft, 10... Discharge gate, 11... Vertical shaft, 12... Connecting plate, 21... Storage tank, 22...
- Sub-hopper, 23... Opening/closing gate, 24... Gate rotation axis, 25... Discharge gate rotation axis, 26... Discharge gate.

Claims (3)

[Claims] (1) A storage device for molding and solidifying fine particles into granular solids using a hydrated salt growth reaction and discharging them, the supply port for granular molded products obtained by humidifying and molding fine particles containing hydrated salt-forming substances. a receiving container having an upper part, a discharge port at a lower part, and a receiving tray inside which receives a granular molded product supplied to the supply port and is rotatable by a horizontal rotation shaft; a storage part having a mouth and a discharge mechanism, the receiving container is arranged so that its discharge port can communicate with the input port of the storage part, and the granular molded product on the receiving tray is removed by rotation of the receiving tray. A storage device characterized in that the storage device is configured such that the particles fall into the storage section. (2) The storage device according to claim 1, wherein the receiving tray is formed so as to serve as a chute for introducing the granular molded product into the storage section when the granular molded product is rotated and tilted. (3) The storage device according to claim 1 or 2, wherein the receiving container rotates around a substantially central vertical axis, and a plurality of the storage portions are arranged at each rotational position. .