JP2626544B2 - Method for preventing sedimentation of solids in slurry and tank preventing sedimentation - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for storing a slurry in a tank, preventing solids from settling during storage, and keeping the slurry homogeneous, and a tank structure capable of realizing the method.

[0002]

2. Description of the Related Art CWM, that is, a fine powder of coal dispersed and suspended in water to form a slurry, is being widely used. In the tank storing the CWM, the solid content in the slurry gradually settles, and the slurry becomes heterogeneous, and eventually, a sediment deposit layer may be formed at the bottom of the tank.

[0003] In order to prevent sedimentation, the CWM in the tank is agitated by a stirring blade. However, a large-scale storage tank must be provided with a large number of stirring blades, and the equipment becomes complicated and expensive. Become. Since the stirring blade is provided on the bottom or side wall of the tank, there is also an inconvenience that maintenance cannot be performed unless the slurry is extracted.

When the slurry has a high concentration, sedimentation of solids is inevitable. Therefore, assuming the presence of sedimentation, the tank bottom is inclined at an angle of 30 ° or more, and a screw is provided at the deepest bottom. It has been proposed to pay out by rotating it (Japanese Patent Laid-Open No. 62-266300).

However, if the sedimentation of solids is not so severe, there is no need to use a screw conveyor. Further, since it is desirable that the dispensed slurry has a uniform concentration as much as possible, it is desirable to keep the slurry in the tank uniform so that the slurry can always be handled by a pump.
Therefore, there has been proposed an apparatus for circulating and agitating slurry by sucking up the deposit at the bottom of the tank with a submersible pump, transferring the slurry to the surface of the slurry, and distributing the slurry (see Japanese Patent Application Laid-Open No. Hei.
167094). This apparatus has problems that it is difficult to suck a deposit having a high solid content by a pump, that it is necessary to increase the driving force of the pump, and that wear is remarkable.

[0006] In addition, a device intended to stir the slurry is provided with a rotatable pipe shaft vertically penetrating the center of the tank, extending the manifold in the radial direction from near the bottom thereof, and providing a large number of liquid ejection nozzles to the manifold. Is open in the up-down direction and nozzles are opened at both ends in one direction on the circumference (Japanese Patent Laid-Open No. 1-213185). This apparatus extracts liquid from the tank bottom and circulates it from the upper part of the pipe shaft, and agitates with liquid ejected up and down from the manifold while slowly rotating the manifold in reaction to ejection from both ends of the manifold. This device is cleverly constructed, but tends to limit agitation near the bottom of the tank.

Based on the idea of preventing sedimentation and accumulation of solids by creating a liquid flow at the bottom of the tank,
It has been proposed that a circular tank is rotated around the center of rotation as a rotation axis, a liquid feed pipe is provided near the bottom, and a lower end of the liquid feed pipe is provided, and a jet port is provided at the lower end of the liquid feed pipe.
issue). In this apparatus, since the effect of preventing deposition is exerted only on the bottom of the tank near the trajectory of the irrigation port, a large number of liquid supply pipes must be arranged in a large-diameter tank.
The withdrawal of the liquid is at a fixed position near the bottom of the tank side wall, and thus involves the same problems as those in the above-described apparatus in which the sediment at the bottom of the tank is pumped by a submersible pump to circulate the slurry.

[0008]

SUMMARY OF THE INVENTION It is an object of the present invention to go one step further from the state of the art described above, to keep the slurry during storage homogeneous for a long period of time and to store the solid without sedimentation or sedimentation. Another object of the present invention is to provide a method for preventing sedimentation of solids in a slurry so that the solid can be discharged.

An object of the present invention is to provide an apparatus for carrying out the above-described method, which has a small pump driving force and has a reduced settling of solids in a slurry, in which the problem of wear of the apparatus is reduced. Providing a protected tank is also included.

[0010]

SUMMARY OF THE INVENTION A method for preventing sedimentation of solids in a slurry according to the present invention is to float a float on the surface of the slurry contained in a tank, provide a suction port there, and provide a suction port near the bottom of the tank. Open the extrusion port, extrude the upper low-concentration slurry sucked from the suction port into the lower-concentration slurry from the extrusion port, circulate the slurry inside the tank or between the inside and outside of the tank, and inside the tank By forming a flow of the slurry, the solid content in the slurry is prevented from settling.

In most cases, it is sufficient to form the flow by circulating the slurry intermittently.

The tank of the present invention for preventing sedimentation of solids in the slurry is provided in a certain group. In the tank containing the slurry, a float is floated on the surface of the slurry and a suction port is attached thereto. Open the extrusion port nearby, connect the suction port and the extrusion port with a flexible hose or liquid feed pipe, and pump the low-concentration slurry in the upper part sucked from the suction port by the pump into the high-concentration slurry in the lower part from the extrusion port. It is configured to extrude.
In this group, the pump is inside the tank and the slurry circulates inside the tank, while in another group, the pump is outside the tank and the slurry circulates inside and outside the tank.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the study on the storage technology of CWM, the inventors first observed the state of sedimentation of solids over time after standing, and obtained the following knowledge. That is, the sedimentation of the solids in the slurry is like a solids layer sedimenting like a piston flow while the liquid medium is stationary, and as shown in FIG. This is a phenomenon in which a supernatant is formed and a deposited layer is formed at the bottom. Then, the deposited layer at the bottom forms a layer called “soft pack” having a relatively low density at first, but the density gradually increases and becomes a strong aggregate called “hard pack”. Although it is difficult to remove the deposited layer as a hard pack, a soft pack can be easily eliminated by stirring. Therefore, stirring need not be carried out continuously or frequently, but may be carried out intermittently at time intervals in which the deposited layer can be eliminated by stirring.

Based on such findings, the inventors have:
Contrary to the related art, the present invention was conceived of sucking the supernatant liquid, pushing it into the bottom of the slurry, destroying the deposited layer being formed, and stirring the slurry by vertical circulation of the slurry. The liquid passing through the pump is a supernatant or a slurry having a low concentration close to the supernatant, which has a very low solid content as described above, so that it is not necessary to increase the driving force of the pump and to reduce abrasion. The suction of the supernatant is easy by floating the float on the surface of the slurry and attaching a suction port there.

Conventionally, since there is a restriction that the liquid level rises and falls with the dispensing, only the high-concentration slurry at the bottom of the tank is sucked. The present invention is the first to provide a suction port for a float.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Various embodiments of the present invention are possible. Hereinafter, an apparatus for implementing these aspects will be described with reference to the drawings.

The embodiment shown in FIG. 2 is suitable for a relatively small-scale slurry tank, which is provided with a communication port on a tank side wall (11) of a tank (1) having a rectangular cross section.
(12) and an extrusion port (4) are provided, and the suction port (3) attached to the float (2) and the communication port (12) are connected by a flexible hose (6A), and the communication port (12) and the extrusion port are connected. And (4) a pump (5A) is provided. The supernatant or low-concentration slurry is sucked through the suction port, passes through the flexible hose to the pump through the communication port, is pressurized, and enters the tank bottom through the extrusion port. The extruded liquid stream rinses the bottom of the tank, destroys the sedimentary layer of sediment that has begun to form, rises on the opposite side wall, and forms a stream. This tank has a rectangular cross section,
A circulating flow may be formed in the longitudinal direction. If necessary depending on the tank capacity, two or more extrusion ports are provided.

This embodiment has an advantage that maintenance is easy because the pump is outside the tank.

In the embodiment shown in FIGS. 3 and 4, a rail (7A) is provided on the upper inside of a tank (1) having a rectangular cross section, and an overhead traveling carriage (8) is mounted thereon. (9A) is suspended, a pump (5A) is installed at the lower end of the pump support, and a motor (8)
Driven by a shaft (82) extending from 1) and passing through a pump strut, thereby forming a flow of slurry in the direction of the arrow, together with running the carriage on rails, at any position in the tank The flow of the slurry can be formed.

The pump is not limited to the type driven from above with the shaft as described above. As shown in FIGS. 5 and 6, a submersible pump (5B) is installed at the lower end of the pump support, and this is mounted on the pump. The same effect can be obtained by driving with electric power supplied through wiring passing through the inside of the support.

Further, the position of the pump does not need to be close to the nozzle header, but may be between the suction port and the extrusion port. Therefore, as shown in FIG. The support (9B) is hung down and a nozzle header (41) is installed at the lower end thereof, while a pump (5C) in semi-liquid is installed in the float (2), and the slurry sucked by the pump in semi-liquid is supplied to the nozzle. You may comprise so that it may push out from a header. Also in this case, the flow of the slurry can be formed at an arbitrary position in the tank by running the carriage on the rail, as in the above-described embodiments.

The above embodiment is suitable for a case where the cross section of the tank is rectangular, and it is needless to say that the rail for the overhead traveling carriage at the upper part inside the tank is preferably provided in the longitudinal direction. Depending on the capacity of the tank, prepare a plurality of floats, suction ports and extrusion ports attached to them, and flexible hose and pump units that connect them, and move the units using one or more carts while moving the slurry. What is necessary is just to comprise so that formation may be performed. 3 and 4 show a type in which one overhead traveling trolley corresponds to each unit, and FIGS. 5 and 6 show a type in which two units are moved by one trolley. FIG. 7 is the same type as FIGS. 3 and 4.

The above embodiment of the present invention can be applied to a tank having a circular cross section, and any of the three embodiments described as being suitable for a tank having a rectangular cross section is applicable to the case of a circular cross section. it can.

In the first and second aspects, a hollow pump column (9C) rotatable from the upper center of a tank having a circular cross section is suspended. 1) A pump is installed at the lower end of the pump column. This is driven by a shaft extending from a motor provided on the pump support and passing through the pump support, or 2) installing a submerged pump (5B) at the lower end of the pump support,
This is driven by electric power supplied through wiring passing through the pump column (9C), and by appropriately rotating the pump column, a slurry flow can be formed at an arbitrary position in the tank. FIG. 8 shows a second embodiment.

In a third mode, a rotatable nozzle header is suspended from the upper center of a tank having a circular cross section and a nozzle header is installed at the lower end thereof, while a semi-submersible pump is installed on a float, The slurry sucked by the semi-liquid submerged pump is configured to be pushed out from the nozzle header, and by appropriately rotating the nozzle header column, a slurry flow can be formed at an arbitrary position in the tank. .

In the group described with reference to FIGS. 3 to 8, the circulation of the slurry is entirely performed inside the tank. As described above, the slurry is taken out by the pump once provided outside the tank. It is also possible to implement a method of returning the inside of the tank again. FIG. 9 and FIG. 10 show examples of apparatuses belonging to such a group. This tank has a rectangular cross section containing a slurry (10) and a float (1) inside the tank (1). (2) is floated and a suction port (3) is attached thereto, and a slurry outlet (14) is provided near the bottom of the tank side wall (11) to provide a flexible hose (6) between the suction port and the outlet.
A), a rail (7A) is provided on the upper part inside the tank, and an overhead traveling carriage (8) is placed. A mobile liquid feed pipe (6B) is suspended from this carriage, and a nozzle header (4) is attached to the tip thereof.
1) is provided, the nozzle (42) is opened downward, a slurry inlet (13) is provided in the upper portion of the tank side wall, and the slurry inlet and the base of the movable liquid feed pipe are connected by a flexible hose (6A). The low-concentration slurry in the upper part sucked from the suction port by the pump is ejected from the nozzle through the slurry inlet and the moving liquid feed pipe while running the overhead traveling carriage on the rail, and the slurry is slurried at an arbitrary position on the bottom surface of the rectangular tank. Is formed so that the flow of
This is a tank that prevents sedimentation of solids in the slurry.

In a tank having a circular cross section, an apparatus of the type shown in FIGS. 11 and 12 can also be implemented. The apparatus shown in these figures, inside a tank (100) having a circular cross section for containing the slurry (10),
A float (2) is floated on the surface of the slurry and a suction port (3) is attached thereto. A slurry outlet (14) is provided near the bottom of the tank side wall (11) to provide a flexible hose between the suction port and the outlet. (6A), a slurry inlet (13) is provided near the bottom of the tank side wall, and a slurry discharge pipe (43) extending from the slurry inlet to the center substantially parallel to the tank bottom is provided. A plurality of nozzles (42) are opened on one side on the circumference, and a pump (5) is provided between the slurry outlet and the slurry inlet.
A), the low-concentration slurry in the upper part sucked from the suction port by the pump is ejected from the nozzle through the slurry inlet and the slurry discharge pipe, and the slurry is circulated between the inside and the outside of the tank, thereby forming a circular shape. This is a tank configured to stir the slurry by forming a flow of the slurry in the circumferential direction inside the tank and preventing sedimentation of solids in the slurry.

In order to generate a strong circumferential flow, there are two slurry inlets (13) at positions symmetrical to the center of the circle on the side wall of the tank, as shown in FIG. It is preferable that the slurry discharge pipes (43, 43) are located on the diameter of the circle, and the direction of the slurry ejection nozzles is one direction on the circumference.

The apparatus shown in FIGS. 13 and 14 is also useful in a tank having a circular cross section. In this apparatus, a float (2) is floated on a surface of a slurry and a suction port (3) is attached to the inside of a tank (100) having a circular cross section for accommodating a slurry (10). Slurry outlet near bottom
(14), a flexible hose (6A) is connected between the inlet and the outlet, a tubular bearing (44) is arranged at the center of the bottom of the tank, and a rotary manifold (45) that rotates around the axis of the circular tank. ), And at least two rotating slurry discharge tubes (46) extending from the rotary manifold symmetrically with respect to the center and substantially parallel to the tank bottom surface toward the side surface, and one side on the circumference of the slurry discharge tube. A plurality of nozzles (42) are opened, and the slurry outlet and the on-pipe bearing are connected by a pump (5A). The low-concentration slurry sucked from the suction port by the pump is supplied to the tubular bearing ( 44) and the slurry is discharged from the nozzle (42) through the slurry discharge pipe (46) to circulate the slurry between the inside and the outside of the tank to form a circumferential flow inside the circular tank. In addition, the present invention is a tank configured to agitate the slurry by rotating the slurry discharge pipe around a rotary manifold by a reaction of the jet, and thereby preventing sedimentation of solids in the slurry.

Although the illustrated apparatus has two slurry discharge pipes, three or four slurry discharge pipes may be used in a large tank.

The structure of the tubular bearing (44) and the rotating manifold (45) supported by the rotating bearing is as shown in FIGS. Rotating manifold
(45) rotates about a shaft (442) supported by a hub (451) at the center. By rotating the sleeve (452) of the rotary manifold slidably on the Teflon ring (443) provided around the tubular bearing (44), the position of the rotary manifold is correctly and horizontally maintained.
It will be readily appreciated that the slurry travels in the direction of the arrow through the hub (441) of the tubular bearing and the hub (451) of the rotating manifold.

In the apparatus of this aspect, since the slurry ejected from the slurry ejection nozzle is all in one direction on the circumference,
The reaction force generated in the slurry discharge tube is large, and the rotating force of the rotating slurry discharge tube (46) is large. Thereby, the slurry near the bottom of the tank is sufficiently stirred. On the other hand, the slurry in the middle to upper portions of the tank is well stirred by the circumferential flow caused by the slurry ejected from the nozzle in one direction.

In a system in which the slurry is once taken out of the tank by a pump provided outside the tank and returned to the inside of the tank again, there is another embodiment shown in FIGS. The tank shown in these figures is a tank (100) having a circular cross section for containing the slurry (10).
Inside, the float (2) floats on the surface of the slurry and the suction port (3) is attached to it.
A slurry outlet (14) is provided near the bottom of (11), the suction port and the outlet are connected by a flexible hose (6A), and a circumferential rail (7B) is provided along the side wall on the upper side inside the tank. A circling rail with a drive motor (7C) that exists in the diameter direction and turns around the center of the tank as a turning axis is supported on a circumferential rail, and a swivel joint (6D) and a connection pipe (6F) are provided in the center of the upper part of the tank; The transfer liquid pipe (6C) is fixed from the swivel joint (6E) connected to the connecting pipe (6F) and fixed to the swivel rail (7C) with a drive motor, and a plurality of extrusion ports (4) are laterally extended from the lower end. Extend to open the nozzle (42) at the tip,
It has a drive motor (81) for rotating the transfer liquid tube and a rotational driving force transmitting means (83), and has a structure in which the transfer liquid tube is driven to rotate and revolves with the turning of the turning rail while rotating. The low-concentration slurry in the upper part sucked from the suction port by the pump is jetted from the nozzle through the slurry inlet and the transfer liquid pipe, and the slurry is circulated between the inside and the outside of the tank. This is a tank configured to be capable of forming a flow of the slurry and preventing sedimentation of solids in the slurry.

A tank of the type shown in FIGS. 19 and 20 is of a slightly different type in a similar manner.
In this tank, a float (2) is floated on the surface of the slurry and a suction port (3) is attached to the inside of the tank (100) containing a slurry (10) and having a circular cross section. A slurry outlet (14) is provided near the bottom and a flexible hose (6A) is connected between the inlet and the outlet by a flexible hose (6A). A swivel rail (7C) with a drive motor that swings with the center of the tank as the swivel axis is supported on a circumferential rail, and a fixed swivel joint (6D) and a connection pipe (6F) are provided at the center of the upper part of the tank, with a drive motor. Swivel rail (7C)
A driving motor (81) and a reciprocating driving means (84) are provided so that at least one traveling vehicle (8) is placed on the upper surface of the traveling vehicle, and the traveling vehicle can reciprocate in a radial direction on the turning rail. The liquid pipe (6B) is hung down, and the base of the moving liquid feed pipe is connected to the tip of the connection pipe (6F) and the flexible hose (6).
, A nozzle header (41) is provided at the lower end of the moving liquid feed pipe, and a plurality of nozzles (42) are opened downward, so that the moving liquid feed pipe reciprocates with the traveling carriage in the radial direction and the turning rail turns. The low-concentration slurry sucked from the suction port by the pump is ejected from the nozzle through the slurry inlet and the transfer liquid pipe, and the slurry is circulated between the inside and the outside of the tank to form a circular tank. This is a tank configured to form a flow of the slurry over substantially the entire bottom surface and preventing sedimentation of solids in the slurry.

In the tank of the present invention in which sedimentation of solids in the slurry is prevented, it is found that a high slurry circulation effect can be obtained by coating the bottom of the tank with a synthetic resin such as Teflon resin, epoxy resin or polyolefin resin. Was. This is presumably because the resin coating makes the surface smoother than the steel plate of the tank material as it is.

The shape of the bottom surface of the tank is usually a flat horizontal surface, but it is possible to promote the circulation of the slurry by giving it an appropriate inclination.

[0037]

【Example】

[Example 1] Three rectangular tanks having a width of 50 cm x a depth of 200 cm x a height of 50 cm were manufactured from a polyvinyl chloride plate. The bottom surface was inclined at 5 ° with respect to the horizontal, and a Teflon sheet was attached. By providing an extrusion port on the side where the bottom is raised due to the inclination, providing a communication port above it, connecting the two with a pump and piping, connecting a flexible hose to the communication port, and fixing the tip to the float And a tank having the structure shown in FIG.

Into this, CWM is put to a maximum depth of 35 cm,
The pump was operated intermittently once a week for 10 hours to circulate the slurry. The circulation flow rate is 3 liter / min.

Three months after storage, CWM was withdrawn from the nozzle attached to the lower part of one of the tanks, and the thickness of the sediment adhering to the bottom surface and not flowing out was measured to be 0.5 cm. Six months later, the second tank was similarly examined, and the sediment thickness was 0.9 cm. Twelve months later, when the third tank was opened, the thickness of the sediment was 1.1 cm, and it was confirmed that the deposition was not a problem in practical use.

Example 2 A rectangular parallelepiped tank having a width of 50 cm, a depth of 200 cm and a height of 50 cm was manufactured from a polyvinyl chloride plate, and a steel plate was attached to the bottom surface. Two rails are provided at a height of 2.20 cm, a traveling carriage with a pump drive motor is mounted thereon, and the SUS floating suction and the pump are connected by a flexible hose. The structure shown in FIGS. 3 and 4 Tank.

The tank was filled with CWM to a depth of 35 cm, and the pump was operated once a week for 10 hours. The slurry circulation rate is 3 liters / hour. During this time, the truck moved at a speed of 10 cm / min and reciprocated on the rails.

After 3 months, 6 months and 12 months after storing the CWM as described above, the bottom of the tank was observed.
m, 1.8 cm and 2.5 cm.

[0043]

According to the method of the present invention, if the sedimentation of solids in the slurry is prevented, it is not necessary to handle a slurry having a high concentration unlike the prior art, and the problems of driving energy and abrasion of the apparatus are reduced. You. It is as described in the examples that the sedimentation can be effectively prevented.

The apparatus of the present invention can be used not only in the case where the pump is outside the tank but also in the case where the pump is inside the tank.
The float-flexible hose-pump-strut unit can be lifted out of the slurry for maintenance, eliminating the need to dispense the slurry. This, combined with the low wear in principle, can dramatically reduce maintenance effort and costs.

In the operation of this apparatus, the time interval for stirring by circulation of the slurry can be lengthened,
In addition, since one operation is sufficient in a short time, energy consumption is very small, partly due to the ease of driving. It goes without saying that the operation can be automatically performed according to each case, that is, according to a program determined according to the type of slurry, the solid content concentration, the degree of ease of sedimentation, and the like.

[Brief description of the drawings]

FIG. 1 is a conceptual longitudinal sectional view showing a situation in which a solid content in a slurry is settling by storage.

FIG. 2 is a longitudinal sectional view of a tank showing an example of the apparatus of the present invention.

FIG. 3 is a longitudinal longitudinal sectional view of a tank showing another example of the apparatus of the present invention.

FIG. 4 is a longitudinal sectional view of the apparatus in FIG. 3 in a tank width direction.

FIG. 5 is a longitudinal sectional view similar to FIG. 3, showing still another example of the device of the present invention.

6 is a longitudinal sectional view, similar to FIG. 4, of the device of FIG. 5;

FIG. 7 is a longitudinal sectional view similar to FIG. 3, showing yet another example of the device of the present invention.

FIG. 8 is a longitudinal sectional view similar to FIG. 3 of a tank having a circular cross section, showing still another example of the device of the present invention.

FIG. 9 is a longitudinal sectional view of a tank showing a different example of the device of the present invention.

FIG. 10 is a cross-sectional view of the device of FIG.

FIG. 11 is a longitudinal sectional view of a tank having a circular cross section, showing still another example of the apparatus of the present invention.

FIG. 12 is a cross-sectional view similar to FIG. 10 of the apparatus of FIG. 11;

FIG. 13 is a longitudinal sectional view of a tank with a circular cross section, showing still another example of the device of the present invention.

FIG. 14 is a cross-sectional view of the device of FIG.

FIG. 15 is a partially enlarged sectional view of the device of FIG. 13;

FIG. 16 is a cross-sectional view taken along the line AA of FIG.

FIG. 17 is a longitudinal sectional view of a tank similar to FIG. 9, showing still another example of the device of the present invention.

18 is a cross-sectional view of the device of FIG.

19 is a longitudinal sectional view of a tank similar to FIG. 17, showing another example of the apparatus of the present invention.

20 is a cross-sectional view of the device of FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 A tank with a rectangular cross section 11 A tank side wall 12 A communication port 13 A slurry inlet 14 A slurry outlet 100 A tank with a circular cross section 2 Float 3 Suction port 4 Extrusion port 41 Nozzle header 42 Nozzle 43 Slurry discharge pipe 44 Tubular bearing 45 Rotation Manifold 46 Rotating slurry discharge pipe 5A pump 5B Liquid pump 5C Semi-liquid pump 6,6A Flexible hose 6B Moving liquid feed pipe 6C Transfer liquid pipe 6D, 6E Swivel joint 6F Connection pipe 7A rail 7B Circular rail 7C Swivel rail 8 Overhead traveling cart 81 Drive motor 82 Drive shaft 83 Rotational force transmitting means 84 Traveling driving means 9A Pump support 9B Nozzle header support 9C Rotatable pump support 10 Slurry

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Takao Yokoyama 1-13-8 Kamiookanishi, Konan-ku, Yokohama-shi, Kanagawa Japan Industrial Cleaning Co., Ltd.

Claims (18)

(57) [Claims] 1. A float is provided on a liquid surface of a slurry contained in a tank, a suction port is provided therein, and an extrusion port is opened near a tank bottom, and a low-concentration slurry at an upper portion sucked from the suction port is discharged from the extrusion port. Extrude into the lower concentrated slurry, circulate the slurry inside the tank, or inside and outside the tank, and stir by forming a slurry flow inside the tank to prevent sedimentation of solids in the slurry Method. 2. The method according to claim 1, wherein the stirring of the slurry is performed intermittently. 3. The method according to claim 1, wherein the slurry contained in the tank is CWM. 4. In the tank for storing the slurry, a float is floated on the surface of the slurry and a suction port is attached thereto, and an extrusion port is opened near the bottom of the tank, and a flexible hose is provided between the suction port and the extrusion port. Connected, pump the low-concentration slurry in the upper part sucked from the suction port by the pump and extrude it into the high-concentration slurry in the lower part from the extrusion port, circulate the slurry inside the tank and form the slurry flow to stir the slurry A tank that prevents sedimentation of solids in the slurry. 5. A side wall (1) of a tank (1) having a rectangular cross section.
1) A communication port (12) and an extrusion port (4) are provided, and the suction port (3) attached to the float (2) and the communication port (12) are connected by a flexible hose (6A). The pump (5A) is provided between the (12) and the extrusion port (4).
Tank. 6. A rail (7A) is provided on the upper inside of a tank (1) having a rectangular cross section, and an overhead traveling carriage (8) is mounted thereon. A hollow pump support (9A) is suspended from the carriage. ) A pump (5A) is installed at the lower end of the pump support and is driven by a shaft (82) extending from a motor (81) provided on the truck and passing through the pump support. A submerged pump (5B) is installed, driven by electric power supplied through a wiring passing through the inside of the pump support, and the carriage is caused to run on rails, thereby controlling the flow of slurry at an arbitrary position in the tank. 5. The tank of claim 4, wherein said tank can be formed. 7. A rail (7A) is provided on the inside upper part of a tank (1) having a rectangular cross section, and an overhead traveling carriage (8) is mounted thereon. A nozzle header is installed, and on the other hand, a semi-liquid pump (5C) is installed on the float (2), and the slurry sucked by the semi-liquid pump is pushed out from the nozzle header. 5. The tank according to claim 4, wherein a flow of the slurry can be formed at an arbitrary position in the tank by running. 8. An inner upper rail of a tank is provided in a longitudinal direction of a transverse section, and a float, a suction port and an extrusion port attached to the float, a plurality of units of a flexible hose and a pump connecting the float and the pump are prepared, and one or more units are provided. 8. The tank according to claim 6, wherein a plurality of carts move the units to form a flow of the slurry. 9. A rotatable hollow pump column (9C) is suspended from the upper center of a tank (100) having a circular cross section. A) A pump is installed at the lower end of the pump column, and this is mounted on the pump column. Either driven by a shaft extending from the motor provided above and passing through the pump column, or b) installing a submerged pump (5B) at the lower end of the pump column,
5. The tank according to claim 4, wherein the slurry is driven at a desired position in the tank by rotating the pump support by driving the pump by power supplied through a wire passing through the pump support. 10. A rotatable nozzle header column is suspended from the upper center of a tank having a circular cross section, and a nozzle header is installed at the lower end of the tank header. 5. The tank according to claim 4, wherein the slurry sucked by a pump is pushed out of the nozzle header, and the flow of the slurry is formed at an arbitrary position in the tank by rotating the nozzle header column. 11. Inside a tank (1) having a rectangular cross section for storing a slurry (10), a float (2) is floated on a surface of a slurry and a suction port (3) is attached thereto, and a tank side wall (11) is provided. A slurry outlet (14) is provided near the bottom of the tank, and the suction port and the outlet are connected by a flexible hose (6A).
A), the overhead traveling carriage (8) is mounted, the moving liquid transfer pipe (6B) is suspended from the carriage, a nozzle header (41) is provided at the tip thereof, the nozzle (42) is opened, and the upper part of the tank side wall is opened. A slurry inlet (13) is provided in the upper part, and the slurry inlet and the base of the moving liquid feed pipe are connected by a flexible hose (6). A low-concentration slurry is ejected from a nozzle through a slurry inlet and a moving liquid feed pipe to circulate the slurry between the inside and the outside of the tank, so that a slurry flow can be formed at any position on the bottom of the rectangular tank. A tank that prevents sedimentation of solids in the slurry. 12. The tank according to claim 4, wherein a bottom surface of the tank is covered with a resin or a metal plate. 13. The tank according to claim 4, wherein the bottom surface of the tank is inclined in one or more directions. 14. Inside a tank (100) having a circular cross section for storing a slurry (10), a float (2) is floated on a surface of the slurry and a suction port (3) is attached thereto, and a tank side wall (11) is provided. A slurry outlet (14) is provided near the bottom of the tank, a flexible hose (6A) is connected between the suction port and the outlet, and a slurry inlet (13) is provided near the bottom of the tank side wall. A slurry discharge tube (4) extending toward the center substantially parallel to the bottom surface
3) is provided, a plurality of nozzles (42) are opened on one side of the circumference of the slurry discharge pipe, and the slurry outlet and the slurry inlet are connected by a pump (5A), The low-concentration slurry in the upper part sucked from the suction port by the pump is ejected from the nozzle through the slurry inlet and the slurry discharge pipe, and the slurry is circulated between the inside and outside of the tank. A tank for preventing sedimentation of solids in the slurry, the tank being configured to stir the slurry by forming a flow. 15. A slurry discharge pipe is provided with two slurry inlets (13) on the tank side wall at positions symmetrical with respect to the center of the circle.
15. The tank according to claim 14, wherein (43, 43) is located on the diameter of the circle, and the direction of the nozzles is one direction on the circumference. 16. Inside a tank (100) having a circular cross section for storing a slurry (10), a float (2) is floated on a surface of a slurry and a suction port (3) is attached thereto, and a tank side wall (11) is provided. Slurry outlet near bottom of
(14) is provided to connect the inlet and outlet with a flexible hose (6A), and a tubular bearing (4) is provided at the center of the tank bottom.
And 4) providing a rotating manifold (45) for rotating about the axis of the circular tank, from which at least two rotating slurries extending symmetrically about the center and substantially parallel to the tank bottom and towards the side walls. Release tube (4
6), a plurality of nozzles (42) are opened on one side of the circumference of the slurry discharge pipe, and the slurry outlet and the tubular bearing are connected by a pump (5A). The low-concentration slurry in the upper part sucked from the suction port is ejected from the nozzle (42) through the tubular bearing (44) and the slurry discharge pipe (46), and the slurry is circulated between the inside and outside of the tank to form a circular tank. Internally, a flow in the circumferential direction is formed, and the slurry is stirred by rotating the slurry discharge pipe around the rotary manifold by the recoil of the jet, thereby preventing sedimentation of solids in the slurry. tank. 17. Inside a tank (1) having a circular cross section for containing a slurry (10), a float (2) is floated on a surface of the slurry and a suction port (3) is attached to the float (2). A slurry outlet (14) is provided near the bottom and a flexible hose (6A) is connected between the inlet and the outlet by a flexible hose (6A). A swivel rail (7C) with a drive motor that exists and turns around the center of the tank as a swivel axis is supported on a circumferential rail, and a swivel joint (6D) and a connection pipe (6F) are provided at the center of the upper part of the tank.
And a swivel joint (6) fixed to the swing rail (7C) with a drive motor and connected to the connection pipe (6F).
E), the transfer liquid pipe (6C) is hung down, a plurality of extrusion ports (4) are extended laterally from the lower end thereof, and the nozzle (4
2) having a drive motor (81) for rotating the transfer liquid tube and a rotational drive force transmitting means (83);
The transfer liquid pipe is rotated and driven to rotate and revolves with the rotation of the swivel rail. A tank for preventing sedimentation of solids in the slurry, wherein the tank is configured to eject the slurry, circulate the slurry between the inside and the outside of the tank, and stir the slurry over substantially the entire bottom surface of the circular tank. 18. Inside a tank (100) having a circular cross section for storing a slurry (10), a float (2) is floated on a surface of a slurry and a suction port (3) is attached thereto, and a tank side wall (11) is provided. Slurry outlet near bottom of
(14) is provided to connect the suction port and the outlet with a flexible hose (6A), and a circumferential rail (7B) is provided along the side wall on the upper side of the inside of the tank so that the center of the tank exists in the diameter direction. Swivel rail with drive motor that swivels as swivel axis
(7C) is supported on a circumferential rail, a fixed swivel joint (6D) and a connecting pipe (6F) are provided in the center of the upper part of the tank, and at least one traveling cart (81) is mounted on a turning rail (7C) with a drive motor. And a drive motor (81) so that the traveling vehicle can reciprocate on the turning rail in the radial direction.
And a reciprocating drive means (84) are provided, the mobile liquid feed pipe (6B) is hung down from the traveling cart, and the base of the mobile liquid feed pipe is connected to the connecting pipe (6).
F) and connected by a flexible hose (6), a nozzle header (41) is provided at the lower end of the moving liquid sending pipe, and a plurality of nozzles (42) are opened downward, so that the moving liquid sending pipe and the traveling carriage have a radius. The low-concentration slurry sucked from the suction port by the pump is ejected from the nozzle through the slurry inlet and the transfer liquid pipe while reciprocating in the direction and rotating as the turning rail turns. A tank for preventing sedimentation of solids in the slurry, which is configured to circulate the slurry over the entire surface so as to form a flow of the slurry over substantially the entire bottom surface of the circular tank.