JP2019210088A - Slurry conveying facility and slurry conveying method - Google Patents

Abstract

To provide a slurry conveying facility and a slurry conveying method capable of stably feeding a slurry by preventing a slurry feed piping from being clogged due to its solid content even when the slurry feed pump stops.SOLUTION: In a slurry conveying facility 10 for conveying a slurry from a first tank 11 to a second tank 12 via a first flow path, the first flow path F1 has a slurry feed pump P, a first piping T1 connecting between the first tank 11 and the slurry feed pump P and having a first shutoff valve V1, and a second piping T2 connecting between the slurry feed pump P and the second tank 12 and having a second shutoff valve V2. The second piping T2 has a branching piping T3 which branches from a piping between the second shutoff valve V2 and the second tank 12, connects to a slurry temporary receiving tank 13, and has a drain valve V3. The second piping T2 has a section located above the slurry temporary receiving tank 13, thereby discharging the slurry from the branching piping T3 to the slurry temporary receiving tank 13 when the slurry feed pump P stops.SELECTED DRAWING: Figure 1

Description

  TECHNICAL FIELD The present invention relates to slurry feeding, and more particularly, to a slurry transport facility and a slurry feeding method for preventing clogging of a slurry feeding pipe.

  Slurry feeding is often used as one of the methods for transporting solids. For example, the processing method for concentrating the target component from ore containing useful metals and obtaining the concentrate, the processing method for leaching useful metals using a leachate such as sulfuric acid, etc., use water as the basic medium. Known, slurrying of solids is performed prior to these treatments.

  Liquid transport equipment such as a pump and piping is used for transporting the slurry between the individual steps. Unlike the case of feeding a liquid alone, when sending a slurry, it is more important to design a liquid feeding facility based on physical properties such as specific gravity and viscosity. With regard to the pump, when the pumping capacity is insufficient, liquid feeding itself cannot be performed. On the other hand, when the pumping capacity is excessive and the pipe diameter is small, wear of the pipe may be remarkable.

  For example, in Patent Document 1, in an ore slurry production method for producing an ore slurry from raw ore, a part of the oversized particles removed in the crushing and classification stage is charged and added to the ore slurry concentration stage. Describes that the increase in viscosity of the ore slurry can be suppressed.

Japanese Patent No. 5257501

  However, even when a method such as Patent Document 1 is used, the slurry feed pump can be stopped. When the slurry feed pump stops for a certain time or longer, the solid content settles in the feed pipe and the pipe is blocked. When the pipe is blocked, the blockage may be eliminated by flushing with water. However, when the solid matter is clogged due to being densely packed, it is necessary to remove the clogging by removing the pipe. Naturally, the operation is stopped during this period, which is not preferable in terms of economy.

  Therefore, the present invention has been proposed in view of such a situation, and even when the slurry feeding pump is stopped, the slurry feeding pipe is prevented from being clogged with solids, and stable slurry feeding is achieved. Provided are a slurry conveying facility and a slurry feeding method.

  The present inventors have repeatedly studied about a method for avoiding clogging of the slurry feeding pipe due to the solid content, and designing the system so that the slurry in the pipe is discharged to the temporary slurry receiving tank when the pump is stopped. The invention has been completed.

  That is, one embodiment of the present invention is a slurry transport facility for sending slurry from a first tank to a second tank via a first channel, and the first channel is a slurry feed pump. A first pipe that connects the first tank and the slurry feed pump and includes the first shutoff valve, and a second pipe that connects the slurry feed pump and the second tank and includes the second shutoff valve. The second pipe is branched from the pipe between the second shut-off valve and the second tank and connected to the slurry temporary receiving tank, and has a branch pipe having a drain valve. The second pipe is provided with a section located above the temporary slurry receiving tank so that the slurry is discharged from the branch pipe to the temporary slurry receiving tank when the slurry feed pump is stopped.

  According to one aspect of the present invention, when the slurry feeding pump is stopped, the slurry can be discharged from the branching pipe to the slurry temporary receiving tank, so that the slurry feeding pipe is prevented from being blocked by the solid content, Stable slurry feeding becomes possible.

  In one embodiment of the present invention, the slurry temporary receiving tank may be the first tank.

  In this case, it is efficient because the slurry in the pipe can be returned to the first tank as it is.

  At this time, in one embodiment of the present invention, the second pipe may include a branch shutoff valve upstream from the branch point of the branch pipe.

  By providing the branch shutoff valve upstream from the branch point of the branch pipe, the slurry on the downstream side of the branch point can be selectively led to the branch pipe when the slurry feed pump is stopped.

  In one embodiment of the present invention, a plurality of branch pipes may be provided.

  By providing the branch pipes at a plurality of locations, the slurry in the pipes can be efficiently discharged.

  Another aspect of the present invention is a slurry feeding method using the above-described slurry conveying equipment, an abnormality detection step for detecting an abnormality during slurry feeding operation, and a slurry feeding when an abnormality is detected. A pump stop step for stopping the pump, and a valve opening / closing step for closing the first shut-off valve and the second shut-off valve and opening the drain valve, and by operating the drain valve in the valve opening / closing step The slurry is discharged from the branch pipe to the temporary slurry receiving tank without driving the slurry feed pump.

  According to another aspect of the present invention, in the valve opening / closing step, the slurry flow path can be discharged into the slurry temporary receiving tank by changing the slurry flow path. Therefore, it is possible to prevent clogging and to supply a stable slurry.

  At this time, in another aspect of the present invention, the ratio of particles having a particle diameter of 45 μm or less in the solid constituting the slurry may be adjusted to be 50% or less.

  By adjusting the particle size in the solid constituting the slurry, an increase in the viscosity of the slurry can be suppressed, and the slurry feeding pipe can be further prevented from being blocked by the solid content.

  In another aspect of the present invention, the ratio of the specific gravity of the solids constituting the slurry and the medium to be suspended may be 2.0 or more.

  In the case of the above ratio, solid content tends to precipitate when the slurry is allowed to stand, but by applying the present invention, it is possible to prevent the slurry feeding pipe from being blocked by the solid content.

  In another embodiment of the present invention, the drain valve may be opened and closed after a set time from the stop of the slurry feed pump.

  By opening and closing the drain valve after a set time, the slurry staying in the pipe can be discharged more efficiently.

  According to the present invention, in the process involving the feeding of slurry, even when the slurry feeding pump is stopped, the clogging of the slurry feeding pipe due to the solid content is avoided, and without specially performing the work for removing the clogging, The slurry feeding can be resumed.

It is a schematic block diagram of the conveyance equipment of the slurry which concerns on the 1st Embodiment of this invention. It is a schematic block diagram of the conveyance equipment of the slurry which concerns on the 2nd Embodiment of this invention. It is a schematic block diagram of the conveyance equipment of the slurry which concerns on the 3rd Embodiment of this invention. It is process drawing which shows the outline of the process in the liquid feeding method of the slurry which concerns on one Embodiment of this invention.

A specific embodiment to which the present invention is applied (hereinafter referred to as “the present embodiment”) will be described in detail with reference to the drawings in the following order. Note that the present invention is not limited to the following embodiments, and various modifications can be made without departing from the scope of the present invention.
1. 1. Outline of the present invention 2. Slurry transfer equipment Slurry feeding method

<1. Summary of the present invention>
The slurry transport facility according to an embodiment of the present invention is used as, for example, a transport facility for ore slurry in a hydrometallurgical process by a high pressure acid leaching method (HPAL method) of nickel oxide ore. Specifically, the present invention can be applied to scenes as described below.

  For example, there is a technique for recovering chromite contained in nickel oxide ore. In this technology, a nickel oxide ore that has been oversized by mechanical operation is slurried by a large-scale processing device (specifically, a shake-out machine, etc.), and the particle size is high in nickel using a hydrocyclone or a specific gravity separator. This technology separates fine-grained goethite and large-size chromite.

  Bulk processing for supplying nickel oxide ore as raw material may occur when the process stops intermittently due to ore characteristics (such as wet ore sticking or clogging or breakage of transport equipment caused by large ores) The load may increase or decrease, and the chromite recovery plant located downstream is also affected by the previous process, and the operation of the slurry feed pump may stop intermittently. As described above, the chromite recovery plant separates the fine-grained goethite and the chromite having a large particle size, and the density ratio between the solid content having a large particle size and the aqueous solution as the medium is 2 on the lower process side in the chromite recovery plant. From the above, the solid content immediately settles when the slurry is allowed to stand. That is, when the slurry liquid feed pump stops for a certain time or longer, the solid content settles in the liquid feed pipe and the pipe is blocked.

  Therefore, by applying the slurry transport facility and the slurry feeding method according to the embodiment of the present invention, the slurry feeding pipe is prevented from being blocked by the solid content, and the slurry feeding can be stably performed.

  In addition to the example described above, for example, the processing speed varies in the upper process and the lower process, and accordingly, it is necessary to cope with this by adjusting the liquid feeding flow rate. When the liquid flow rate is extremely reduced due to trouble or the like, the flow rate may not be within the operating range of the pump. In this case, intermittent liquid supply is used. In this intermittent liquid feeding, when the pump stop time is long, solid content settles in the slurry liquid feeding pipe, and the pipe may be blocked. Once the piping is blocked, it is necessary to stop the process and open the piping to physically remove the obstruction. In the case of large-diameter piping, it is necessary to arrange heavy machinery etc. in addition to securing personnel. There was a problem that the process stoppage period became long.

  Even in such a case, by applying the slurry conveyance facility and the slurry feeding method according to the embodiment of the present invention, the slurry feeding pipe is prevented from being clogged with solids, and the slurry feeding is stable. Can do it.

<2. Slurry transport equipment>
Next, the configuration of the slurry transport facility according to an embodiment of the present invention will be specifically described. FIG. 1 is a schematic configuration diagram of a slurry transport facility according to an embodiment of the present invention. One aspect of the present invention is a slurry transport facility 10 that sends a slurry from a first tank 11 to a second tank 12 via a first flow path F1, and the first flow path F1 is a slurry. The first liquid supply pump P, the first tank 11 and the slurry liquid supply pump P are connected, the first pipe T1 provided with the first shut-off valve V1, and the slurry liquid supply pump P and the second tank 12 are connected. And a second pipe T2 having a second shut-off valve V2, and the second pipe T2 branches off from a pipe between the second shut-off valve V2 and the second tank 12 and temporarily receives slurry. It has a branch pipe T3 that is connected to the tank 13 and has a drain valve V3. The second pipe T2 has a section located above the slurry temporary receiving tank 13, so that the slurry feed pump P is stopped. Sometimes, the slurry is discharged from the branch pipe T3 to the slurry temporary receiving tank 13.

  With such a configuration, when the slurry feed pump P is stopped, the slurry can be discharged from the branch pipe T3 to the slurry temporary receiving tank 13 by opening the drain valve V3. Is prevented from being clogged with solids, and stable slurry feeding is possible.

  The first tank 11 and the second tank 12 are, for example, a slurry storage tank or a thickener. The 1st tank 11 and the 2nd tank 12 can prevent sedimentation of the solid content of a storage tank by providing the stirrer 14, for example. Slurry liquid feeding is performed by using a slurry liquid feeding pump P and a slurry transport pipe (first pipe T1, second pipe T2) connected between the first tank 11 and the second tank 12. . A first shutoff valve V1 is provided between the first tank 11 and the slurry feed pump P. When the slurry feed pump P is stopped, the first shutoff valve V1 is closed and the slurry feed pump is shut down. By blocking the back pressure from the first tank 11 applied to the suction side of the liquid pump P, the leakage of the slurry and the blockage of the suction side pipe (first pipe T1) due to the failure of the seal portion of the slurry feed pump P are prevented. To prevent.

  The discharge side of the slurry feed pump P has a second shut-off valve V2 that closes when the pump is stopped and a drain valve V3 that opens. The first cutoff valve V1, the second cutoff valve V2, and the drain valve V3 may be manual valves, but are preferably automatic valves. These automatic valves can arbitrarily set the time from pump stop to operation. When the slurry feed pump P is stopped for some reason, the automatic valve operates after the set time has elapsed, so that the slurry in the slurry feed pipe is drained and the liquid feed pipe is blocked by the solid content. To prevent.

  The slurry drained from the drain valve V3 is discharged to the temporary slurry receiving tank 13. The second pipe T2 is provided with a section located above the slurry temporary receiving tank 13, so that when the slurry feed pump P is stopped, the second pipe T2 is discharged to the slurry temporary receiving tank 13 through the branch pipe T3 due to its own weight. It is preferably designed to be Alternatively, the slurry in the pipe may be fed to the slurry temporary receiving tank 13 by providing a slurry feeding pump for discharging the slurry different from the slurry feeding pump P. The slurry discharged to the temporary slurry receiving tank 13 can be returned to the first tank by a pump or the like. As the pump provided in the slurry temporary receiving tank 13 (such as a sump), a pump that operates and stops depending on the height of the liquid level of the sump is generally used.

  As the slurry temporary receiving tank 13, a large amount of slurry can be received by using an empty tank. The tank may not have a lid, but if it is used in a state where rainwater or the like has entered, there is less room for receiving the slurry. In order not to dissipate even if the slurry overflows, a liquid bank may be provided so as to surround the tank. The scene itself surrounded by the breakwater may be used instead of the slurry temporary receiving tank 13. When the inside of the breakwater is narrow, a water reservoir may be created by excavating the scene, and this water reservoir may be used in place of the slurry temporary receiving tank 13. The slurry discharge path to the slurry temporary receiving tank 13 is connected to the pipe so as to open the lid or the side wall of the slurry temporary receiving tank 13, or the pipe is connected to the slurry temporary receiving tank 13 without providing the slurry temporary receiving tank 13. It is constituted by opening above.

  FIG. 2 is a schematic configuration diagram of a slurry transport facility according to the second embodiment of the present invention. The slurry transport facility 20 according to the second embodiment of the present invention includes a first feed valve P1, a first tank 21, and a slurry feed pump P connected to each other and provided with a first shut-off valve V1. Although the point which has 2nd piping T2 which connects the piping T1, the slurry feed pump P, and the 2nd tank 22 and is equipped with the 2nd cutoff valve V2 is the same as 1st Embodiment, The difference is that a branching pipe T5 that branches off from the pipe between the second shutoff valve V2 and the second tank 22 and includes a drain valve V5 is connected to the first tank. Further, the slurry transport facility 20 according to the second embodiment of the present invention may include a branch cutoff valve V4 upstream (second cutoff valve V2 side) from the branch point of the branch pipe T5.

  According to the slurry transport facility 20 according to the second embodiment of the present invention, the slurry in the pipe can be directly returned to the first tank 21 without going through the slurry temporary receiving tank, so that the transport energy and transport time can be reduced. Less. Further, a branch shutoff valve V4 is provided upstream from the branch point of the branch pipe T5, and the slurry on the downstream side of the branch point is selectively transferred to the branch pipe T5 by closing the slurry feed pump P when stopped. Can lead.

  FIG. 3 is a schematic configuration diagram of a slurry transport facility according to a third embodiment of the present invention. The slurry conveyance facility 30 according to the third embodiment of the present invention includes the branch pipe T3 including the drain valve V3 described in the first embodiment and the drain valve V5 described in the second embodiment. It has a configuration including both the branching pipe T5 and the branching shutoff valve V4.

  According to the slurry transport facility 30 according to the third embodiment of the present invention, the slurry in the pipe can be quickly discharged by providing the branch pipes T3 and T5 at a plurality of locations, and the solid content remains. Hateful. Further, by providing the second shutoff valve V2 and the branch shutoff valve V4 on the discharge side of the slurry feed pump P, it is possible to prevent the solid content in the slurry from rushing to one place. Specifically, it is possible to suppress backflow to the pump, accumulation on the pipe bend, and inflow exceeding the capacity of the tank on the slurry receiving side. That is, the slurry in the pipe between the branching shutoff valve V4 and the second tank 32 can be discharged via the branching pipe T5 and between the branching shutoff valve V4 and the second shutoff valve V2. The slurry in the pipe can be discharged separately through the branch pipe V3 so that the slurry in the pipe is discharged.

<3. Slurry feeding method>
Next, a slurry feeding method according to an embodiment of the present invention will be described. FIG. 4 is a process diagram showing an outline of a process in a slurry feeding method according to an embodiment of the present invention. One aspect of the present invention is a slurry feeding method using the above-described slurry transport equipment, which includes an abnormality detection step S1 for detecting an abnormality during slurry feeding operation, and a slurry feeding when an abnormality is detected. A pump stop step S2 for stopping the pump, and a valve opening / closing step S3 for closing the first shut-off valve and the second shut-off valve and opening the drain valve. By the operation, the slurry is discharged from the branching pipe to the temporary slurry receiving tank without driving the slurry feed pump.

  In the valve opening and closing process using the slurry transport equipment described above, the slurry flow path can be changed to change the slurry flow path so that the slurry in the pipe can be discharged to the temporary slurry receiving tank. Therefore, it is possible to prevent clogging and to supply a stable slurry. Hereinafter, each step will be described.

  The abnormality detection step S1 is a step of detecting that an abnormality has occurred in normal slurry feeding operation. Abnormal conditions include power outages and equipment failures. The abnormal state may be detected by, for example, a meter in the control unit, or may be detected by visual inspection or the like. In addition, the abnormality at the time of slurry feeding operation is not limited to the abnormality of the slurry conveying equipment, but also includes a case where an abnormality occurs in a downstream process.

  Pump stop process S2 is a process of stopping the slurry feed pump when an abnormality is detected. For example, in the case where the second tank is a thickener or the like, if the equipment in the downstream process stops for some reason, the slurry exceeding the capacity of the thickener overflows if the slurry feed pump is still operating. Therefore, it is preferable to stop the slurry feed pump promptly when an abnormality is detected. The slurry feed pump may be stopped by control from the control unit, or may be stopped automatically or manually.

  The valve opening / closing step S3 is a step of closing the first cutoff valve and the second cutoff valve and opening the drain valve. When the second pipe has a branching shutoff valve, the branching shutoff valve is also closed.

  For example, taking the slurry transport facility in FIG. 1 as an example, during normal operation, the slurry is fed from the first tank 11 to the second tank 12 through the first flow path F1. And when abnormality is detected, the slurry feed pump P is stopped. Further, the first cutoff valve V1 and the second cutoff valve V2 are closed, and the drain valve V3 is opened. By closing the first shut-off valve V1, the back pressure from the first tank 11 applied to the suction side of the pump is shut off, and the leakage of slurry due to breakage of the seal part of the pump and the suction side piping (first side The blockage of the pipe T1) is prevented. Moreover, the backflow of the slurry to a slurry liquid feeding pump is prevented by making the 2nd cutoff valve V2 into a closed state. The second pipe T2 is designed to have a section located above the temporary slurry receiving tank 13, so that the drain valve V3 is opened, so that the slurry in the pipe is caused by its own weight. It is discharged into the slurry temporary receiving tank 13. Alternatively, the slurry in the pipe may be fed to the slurry temporary receiving tank 13 by providing a slurry feeding pump for abnormal times different from the slurry feeding pump P.

  Further, as in the slurry transfer facility shown in FIG. 3, a branch shutoff valve V4 is further provided, and in the piping between the second shutoff valve V2 and the branch shutoff valve V4 by being closed when an abnormality occurs. The slurry in the pipe between the branch shutoff valve V4 and the second tank 32 can be discharged through the drain valve V5. If it does in this way, it can prevent that the solid content in a slurry rushes to one place, and it suppresses the backflow to a pump, the accumulation to a piping bending part, and the inflow exceeding the capacity | capacitance of the tank of a slurry reception side. Can do.

  When the abnormal state is resolved by the restoration of the equipment, etc., the drain valves V3 and V5 are closed, the first cutoff valve V1, the second cutoff valve V2 and the branch cutoff valve V4 are opened, and the slurry By moving the liquid feeding pump P, the liquid feeding of the slurry can be resumed.

  The property of the slurry in the slurry feeding method according to the embodiment of the present invention is not particularly limited, but the ratio of particles having a particle size of 45 μm or less in the solid constituting the slurry is 50% or less. It is preferable to adjust so that there is. It is known that the particle size and particle size distribution of the ore slurry are related to the viscosity of the ore slurry (for example, Patent Document 1 described above), and by adjusting the particle size in the solid constituting the slurry, An increase in the viscosity of the slurry can be suppressed, and the slurry feeding pipe can be further prevented from being clogged with the solid content.

  Further, in the slurry feeding method according to the embodiment of the present invention, the ratio of the solid content constituting the slurry and the specific gravity of the medium to be suspended may be 2.0 or more. As explained in the example of the recovery of chromite contained in nickel oxide ore, when the density ratio of the solid content having a large particle size and the aqueous solution as the medium is 2.0 or more, the solid content is reduced when the slurry is allowed to stand. Although it becomes easy to precipitate, by applying this invention, it can prevent that slurry feeding piping is obstruct | occluded with solid content.

  Further, the drain valves V3 and V5 can be opened and closed after a set time from the stop of the slurry feed pump P. By providing a preset time in advance, it is possible to prevent the slurry from flowing backward or staying in the pipe after the slurry feed pump P is stopped, and to efficiently discharge the slurry in the pipe. The set time can be adjusted depending on the sedimentation rate of the solid content, and can be set to, for example, 5 seconds or more and 5 minutes or less.

  The present invention will be described in more detail with reference to the following examples and comparative examples, but the present invention is not limited to these examples and comparative examples.

(Example 1)
In the equipment configuration for slurry feeding consisting of the configuration diagram shown in FIG. 3, 45% of the particles constituting the solid content have a particle size of 45 μm or less, the specific gravity of the solid content is 2.5 g / cm ³ , and water is added. The slurry as a medium was fed.

  Since the process of the slurry feeding destination stopped due to equipment trouble, the amount of slurry retained in the slurry receiving tank (second tank) at the feeding destination increased. The slurry is stored up to the acceptance stop level, and with this as a trigger, the second shutoff valve V2 and the branch shutoff valve V4 are automatically closed, the drain valve V5 is automatically opened, and then the slurry feed pump Stopped automatically.

  The first shutoff valve V1 was closed 3 seconds after the pump was stopped, and the drain valve V3 was automatically opened 1 second after the second shutoff valve V2 and the branch shutoff valve V4 were closed. A part of the slurry remaining in the slurry feed pipe was drained to the water reservoir in the liquid barrier via the drain valve V3, and the rest was drained to the slurry storage tank (first tank) via the drain valve V5.

  One hour later, the process of the slurry delivery destination that had been stopped started and the level of the slurry receiving tank (second tank) fell below the acceptance stoppage level, so the slurry delivery pump automatically entered preparation for delivery. It was. After the drain valves V3 and V5 were closed and the first shutoff valve V1, the second shutoff valve V2 and the branch shutoff valve V4 were opened, the slurry feed pump was operated and the slurry feed was resumed. According to this example, slurry feeding could be resumed without clogging the slurry feeding pipe or pump with the solid content in the slurry.

  From the above results, by applying the slurry transport facility and the slurry feeding method according to one embodiment of the present invention, the solid content can be obtained even when the slurry feeding pump is stopped in the process involving the feeding of the slurry. It was found that the clogging of the slurry liquid feeding pipe due to the above was avoided, and the liquid feeding of the slurry could be resumed without specially performing the work for removing the clogging.

  Although one embodiment and each example of the present invention have been described in detail as described above, it will be understood by those skilled in the art that many modifications that do not substantially depart from the novel matters and effects of the present invention are possible. It will be easy to understand. Therefore, all such modifications are included in the scope of the present invention.

  For example, a term described with a different term having a broader meaning or the same meaning at least once in the specification or the drawings can be replaced with the different term in any part of the specification or the drawings. Further, the configurations of the slurry conveying equipment and the slurry feeding method are not limited to those described in the embodiment and the examples of the present invention, and various modifications can be made.

10, 20, 30 Slurry conveying equipment, 11, 21, 31 First tank, 12, 22, 32 Second tank, 13, 33 Temporary slurry receiving tank, 14 Stirrer, P Slurry feed pump, V1 1st 1 shutoff valve, V2 second shutoff valve, V3, V5 drain valve, V4 branch shutoff valve, T1 first pipe, T2 second pipe, T3, T5 branch pipe, F1 first flow path

Claims (8)

A slurry transport facility for sending slurry from the first tank to the second tank via the first flow path,
The first flow path includes a slurry feed pump, a first pipe connected to the first tank and the slurry feed pump and provided with a first shut-off valve, the slurry feed pump, and the first A second pipe connected to the two tanks and provided with a second shut-off valve,
The second pipe is branched from a pipe between the second shutoff valve and the second tank and connected to a slurry temporary receiving tank, and has a branch pipe including a drain valve.
The second pipe is provided with a section located above the temporary slurry receiving tank, and when the slurry feeding pump is stopped, the slurry is discharged from the branch pipe to the temporary slurry receiving tank. Slurry transfer equipment.   The said slurry temporary receiving tank is the said 1st tank, The conveyance apparatus of the slurry of Claim 1 characterized by the above-mentioned.   The said 2nd piping is equipped with the cutoff valve for branching upstream from the branching point of the said branch piping, The conveyance apparatus of the slurry of Claim 1 or Claim 2 characterized by the above-mentioned.   The slurry conveying equipment according to any one of claims 1 to 3, further comprising a plurality of branch pipes. A slurry feeding method using the slurry transport facility according to any one of claims 1 to 4,
An abnormality detection process for detecting an abnormality during slurry feeding operation;
A pump stop process for stopping the slurry feed pump when the abnormality is detected;
A valve opening and closing step for closing the first shut-off valve and the second shut-off valve and opening the drain valve;
By operating the drain valve in the valve opening and closing step, the slurry is discharged from the branch pipe to the slurry temporary receiving tank without driving the slurry feed pump. Liquid feeding method.   The method for feeding a slurry according to claim 5, wherein the ratio of particles having a particle size of 45 µm or less in the solid constituting the slurry is 50% or less.   The method for feeding a slurry according to claim 5 or 6, wherein the ratio of the specific gravity of the solid constituting the slurry and the medium to be suspended is 2.0 or more.   The slurry feeding method according to any one of claims 5 to 7, wherein the drain valve is opened and closed after a set time from the stop of the slurry feeding pump.

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