JP2002249222A - Slurry transfer method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of transferring slurry particularly a fine amount of the slurry without blocking a valve and piping by precipitation of the slurry by a method as simple as possible, by preventing a change of composition and concentration of the slurry adjusted in a regulation tank, in this invention related to the method of transferring a small amount of the slurry via a pipe line having an adjusting valve from the slurry regulation tank. SOLUTION: In the method transferring slurry from a circulating pipe line provided in a first tank to a second tank via an adjusting valve, the problem by precipitation of the slurry is solved by constituting a pipe line in such a manner that this adjusting valve is positioned upward from a branch of this circulating pipe line, relating to the pipe line from this adjusting valve to this blanch, an inflow angle θ1 of the slurry of the circulating pipe line in this blanch is 90 degrees or more and an outflow angle θ2 of the slurry is θ1 to 180 degrees.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for transferring slurry, and more particularly to a method for transferring a small amount of slurry from a slurry adjusting tank via a pipe having an adjusting valve.

[0002]

2. Description of the Related Art In order to use a slurry containing a fibrous or granular insoluble substance, the composition and concentration of the slurry are adjusted in an adjusting tank, and the slurry is adjusted by an adjusting valve via a pipe having an adjusting valve. When transferring to another tank while adjusting the flow rate, this slurry-like or fibrous insoluble material immediately precipitates without agitation, causing blockage in pipes and valves, and failure of valves. Cause problems. In particular, this problem becomes remarkable when a large amount of slurry adjusted to a predetermined composition is once stored in the adjustment layer and transferred little by little. Various attempts have been made to prevent such a blockage of a pipeline for transferring the slurry. For example, JP-A-8-1
No. 31811 discloses a method of supplying a liquid to a flow path deviated from a circulation flow path and removing a slurry in the deviated flow path. Japanese Patent Application Laid-Open No. 52-146770 discloses a device for mixing two types of liquids through a needle valve, in which a third fluid is introduced at an appropriate pressure into a side wall near an outlet of the needle valve, thereby obtaining a surface of the needle. A method for removing nearby precipitates and the like is disclosed. On the other hand,
No. 4-123575 discloses a method for preventing blockage of a valve or a pipe by controlling the opening degree and time of an angle valve or the like. However, all of these are intended to prevent blockage by introducing a third substance around the valve, or to prevent the sedimentation of the slurry by adding a control device to the system, and transfer the precisely adjusted slurry. This is not appropriate in the case where the third substance is not mixed, and when the system is unnecessarily complicated, the cost is increased and a failure is likely to occur. Conventionally, when a large amount of slurry adjusted to a predetermined composition is used little by little, there is nothing to avoid a problem caused by settling of the slurry.

[0003]

DISCLOSURE OF THE INVENTION The present invention provides a method for preparing a slurry, which does not change the composition or concentration of the slurry adjusted in the adjusting tank, and does not block valves and pipes by sedimentation of the slurry in a simple manner as much as possible. In particular, it is an object to provide a method for transferring a small amount of slurry.

[0004]

That is, the present invention provides the following:
From the circulation line provided in the tank to the second tank via the regulating valve
In the method of transferring a rally, the regulating valve is connected to the circulation line.
Pipe from the regulating valve to the branch
Flow of the slurry in the circulation line at the branch to the line
Angle θ₁Is greater than 90 degrees and the slurry flows out
Angle θ₂Is θ ₁The pipeline is configured to be ~ 180 degrees
This is a method for transferring slurry. In addition, the first tank
Return line of circulation line is located higher than the outlet of circulation line
Preferably, the conduit is configured to enter.

[0005]

DETAILED DESCRIPTION OF THE INVENTION The method of the present invention can be applied to any slurry which may settle if left undisturbed. For example, it is intended to remove impurities such as calcium and magnesium in potassium chloride. Α to raw salt
Slurry to which cellulose or oplite is added, polishing slurry in which an abrasive is dispersed, slurry of polymer generated in slurry polymerization of butyl rubber, polyethylene, and the like,
It can be suitably used for various slurries such as a slurry in which a filler is dispersed in a monomer for producing a reinforced plastic.

Hereinafter, the slurry transfer apparatus of the present invention will be described with reference to FIG. It should be noted that the device shown in this figure is merely an example of the present invention, and does not limit the present invention in any way.
As the tank, pipe, valve, stirrer, pump, and the like, conventionally known ones can be appropriately used according to the purpose. First
In the tank (1), an appropriate suspension is solubilized, and an auxiliary agent or the like is appropriately added to adjust a slurry. Since the slurry usually settles when left undisturbed, a circulation line (4) is provided in the first tank (1) to prevent the sedimentation and to take out the slurry from the first tank. The outlet to the circulation line is preferably provided as low as possible in the first tank. In the circulation line (4), the slurry is circulated by the pump (7) and returns to the first tank again. This return port is preferably provided as high as possible in the first tank. Although it depends on the properties of the slurry, it is preferable to constantly circulate the slurry in this circulation pipe (the arrow in the figure indicates the direction in which the slurry flows). Further, the slurry may be continuously or intermittently stirred in the first tank (1) by using the stirrer (8).

A branch (5) to the second tank (2) is provided in the middle of the circulation line (4), and a valve is provided at the end of the branch (5) in the direction of the second tank (2). (3) is provided.
This valve (3) may simply open and close, or may adjust the flow rate of the slurry. In addition, a flow meter may be appropriately provided in the pipeline to measure the flow rate of the slurry. The flow of the slurry from the branch (5) to the valve (3) tends to be stagnant, especially when the valve (3) is closed. Cause blockage. for that reason,
First, it is necessary that the valve (3) is located above the branch (5) so that the suspended matter does not settle in the valve (3). It is not necessary to be located on the top, and it is sufficient if it is horizontal or higher. Further, the pipe between the valve (3) and the branch (5) is preferably short.

Next, the relationship between the pipeline and the flow of the slurry at the branch (5) will be described with reference to FIG. The arrow in the figure indicates the direction in which the slurry flows. In the present invention, there is a valve (11) from the branch position (14) conduit to (15) for the branch position (14) circulation pipeline (12) the angle theta ₁ which flows the slurry is 90 degrees or more in, Valve (1
1) from a slurry of flowing angle theta ₂ is theta ₁ to 180 degrees in the circulation pipe (13) at the branch position (14) against the pipe to the branch position (14) (15). That is, in FIG. 2A, the angle θ ₁ is a right angle, and the angle θ ₂ is 1
80 degrees. Further, to the angle theta ₁ may be more than a right angle, the angle theta ₁ is 90 degrees or more by bending the circulation pipeline (12, 13) in the vicinity of the branch (14) as shown in FIG. 2 (b) You may do so. In the present invention, FIG.
As shown in (a) and (b), the branch position (1) with respect to the pipe (15) from the valve (11) to the branch position (14).
Circulation line in 4) (angle theta ₂ flowing the slurry of 13), but is preferably 180 degrees, and FIG. 2 (c)
As shown in the above as long as the angle theta ₁ is maintained above 90 degrees, the valve (11) from the branch position (14) to the conduit (15) is a linear relationship between the circulation pipe after the branch (13) or even without the (in this case, the angle theta ₂ is equal to θ _1.).

[0009]

【Example】Example 1  Figure 1 shows a system for automatically adding the slurry used in this example.
It is shown in FIG. Ceramic with pipes as shown in Fig. 2 (a)
Ball cock (11) branches from
It was arranged to be directly above the position (14). The entire pipeline
The inner diameter was 2.5 cm. 2,400 liters of water
300 kg of potassium chloride in the turtle, α-cellulose 100
Kg and 20 kg of Oplite slurry
Adjusted in 5,000 liter first tank (1), stirrer
Stirred in (8). This slurry is pumped (7)
Circulate through circulation line (4) at 3,000 liters / hour
Was. From the ball cock (11) to the branch position (14)
The length of the pipe was 20 cm. Open timer circuit
Set the closing time and automatically set the ball cock (11) for 30 seconds
Close for 5 seconds and repeat for 100 seconds
The flow rate of Torr / hour was transferred to the second tank (2). as a result,
Add a stable flow rate without blocking the cock
Was completed. Also, diaphragm valve is used for cock (3)
As a result, the valve became stable without wear and blockage as with the cock.
The added flow rate could be added to the adsorption tank.

[0010]Comparative Example 1  FIG. 3 shows the system used in this comparative example. The same button as in the first embodiment
Ball cock by changing the circulation line
(23) The flow of the slurry in the vicinity was reversed from that in Example 1.
Was. The arrow in the figure indicates the direction in which the slurry flows. Follow
Therefore, the direction of the slurry flow shown in FIG.
You. Except for this change, the same apparatus as in Example 1 was used for all equipment.
Operation was performed. In the first tank (21) as in Example 1.
Set up a timer circuit while circulating the prepared slurry.
Set the opening and closing time and automatically set the ball cock (23) to 30
60 seconds while repeating the operation of closing for 5 seconds and opening for 5 seconds.
A flow rate of Torr / hour was added to the adsorption tank. However, the ball
Time when the cock (23) is closed is as short as 30 seconds
However, it was blocked on the primary side (circulation line side) and the second tank (2
Trouble that did not flow to 2) occurred. Next, Ballco
The lock (23) has been changed from vertical to horizontal.
Obstruction occurred.

[0011]

It is extremely difficult to add a small amount of a slurry-like substance using a pump, and it takes a long time to solve problems such as blockage by a valve / pump and washing with water at the time of blockage. In the present invention, by examining the direction of the valve, the direction of the mounting port, and the direction of the flow from the direction, the problem of the blockage is eliminated, and the operation can be stably performed.

[Brief description of the drawings]

FIG. 1 is a diagram showing a system for automatically adding a slurry of the present invention and a slurry flow.

FIG. 2 is a diagram showing a configuration of a pipeline near a regulating valve and a slurry flow according to the present invention.

FIG. 3 is a diagram showing a conventional system for automatically adding a slurry and a slurry flow.

[Explanation of symbols]

 1,21 First tank 2,22 Second tank 3,11,23 Regulator valve 4,24 Circulation line 5,14 Branch 6 Line to second tank 7 Circulation pump 8,9 Stirrer 12 Slurry to branch Circulating line 13 that flows in. Circulating line 13 in which slurry flows out of the branch 15 Line from the regulating valve to the branch

Claims (2)

[Claims] 1. Adjustment from a circulation line provided in a first tank
In the method of transferring slurry to a second tank via a valve,
The regulating valve is located above a branch of the circulation line,
Circulation at the branch to the line from the valve to the branch
Angle θ at which slurry flows into the pipeline₁Is more than 90 degrees
And the angle θ at which the slurry flows₂Is θ ₁~ 180 degrees
A slurry transfer method in which a pipeline is configured as described above. 2. The slurry transfer method according to claim 1, wherein the pipeline is configured such that a return port of the circulation channel is located above an outlet of the circulation channel in the first tank.