JP2003024819A - Suspended sedimentation type separator and method for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a suspended sedimentation type separator which is capable of performing classification with high accuracy. SOLUTION: The feeding of a treating liquid into a still standing tank 1 of the suspended sedimentation type separator is performed from a plurality of feed nozzles 6 uniformly dispersedly arranged within the same horizontal section of the still standing tank 1, by which the occurrence of the disturbance in the still standing tank 1 is suppressed and the accuracy of classification is improved.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a floating sedimentation separation apparatus and method for separating or concentrating solid particles in a liquid by utilizing sedimentation by gravity.

[0002]

2. Description of the Related Art Conventional solid particle classification processes can be broadly classified into dry and wet classification processes. Examples of the former method include a method using a sieve and a method using centrifugal force. As the latter method, there is a method that utilizes the difference in the falling speed of solid particles in a liquid. This is because the solid particles suspended in the liquid have different settling velocities due to the difference in particle size and specific gravity, so in a flow having a constant flow velocity, the difference in particle size of solid particles appears as the difference in terminal velocity. It is a classification method that utilizes this.

Wet solid particle classification methods include hydraulic classification using an upward flow, centrifugal classification using centrifugal force, gravity classification by simply standing, and the simple and inexpensive method is gravity classification. .

In particular, the floating sedimentation separation technique for continuously concentrating or purifying a solid system in liquid by gravity sedimentation is very widely used.

As shown in FIG. 5, a typical flotation-sedimentation type separation apparatus contains a treatment liquid containing solid particles having different terminal velocities in a stationary tank 11 whose bottom surface is gradually narrowed toward the center. Of the solid particles in the treatment liquid, the solid particles having a high terminal velocity are allowed to settle toward the bottom surface, and the solid particles having a low terminal velocity are taken out from the lower outlet 12 provided at the center of the bottom surface in a thick mud state. It is raised and taken out as an overflow from the upper discharge port 13.

[0006]

By the way, in the conventional floating sedimentation type separation apparatus, the supply of the treatment liquid into the stationary tank 11 is carried out from the charging pipe 14 at the center or the end of the stationary tank 11. ing. However, when the treatment liquid is supplied from the central portion or the end portion of the stationary tank 11, an ascending flow or a turbulent flow is easily generated in the stationary tank 11, and this ascending flow is higher than the terminal velocity of the solid particles to be settled. In this case, among the solid particles in the supplied processing liquid, the high terminal velocity particles as well as the low terminal velocity particles rise in the stationary tank 11, and the high terminal velocity particles also overflow to the outside of the stationary tank 11. There was a problem that it was discharged and high-precision classification could not be performed.

Therefore, the present invention is intended to provide a floating sedimentation separation apparatus and a method therefor, in which an ascending flow or a turbulent flow is unlikely to occur in a stationary tank and which allows highly accurate classification.

[0008]

According to the present invention, a treatment liquid containing solid particles is supplied into a stationary tank, and among the solid particles in the treatment liquid, the solid particles having a high terminal velocity settle toward the bottom surface. And take it out from the lower outlet provided in the center of the bottom,
In a floating sedimentation separation device that raises solid particles with a low terminal velocity and takes them out from the upper discharge port, the supply of the treatment liquid into the stationary tank is uniformly distributed in the same horizontal section of the stationary tank. This is done from a plurality of supply nozzles.

As described above, when the processing liquid is supplied from the plurality of supply nozzles uniformly dispersed in the same horizontal section of the stationary tank, the generation of turbulent flow in the stationary tank can be suppressed. Therefore, the classification accuracy is improved.

In order to more effectively suppress the generation of turbulent flow in the stationary tank, it is desirable that the supply amounts from the plurality of supply nozzles be the same.

As means for uniformly disposing a plurality of supply nozzles in the same horizontal section of the stationary tank, each supply nozzle is two-dimensionally equidistantly arranged in the same horizontal section of the stationary tank. It may be arranged, for example, at each vertex of a mesh-shaped regular polygon drawn by connecting the supply nozzles.

A regular triangle is a typical example of the regular polygon. The stationary tank is provided with a main pipe for supplying the processing liquid, which is piped so as to pass through the center of the horizontal section, from the outside of the stationary tank into the stationary tank, and a plurality of supplies are provided so as to be orthogonal to the main supply tube. The branch pipe may be provided horizontally, and the supply nozzle may be installed in the supply branch pipe.

The leading ends of the main supply pipe and each supply branch pipe are extended to the inner wall surface of the stationary tank or to the vicinity of the inner wall surface, and a plurality of supply nozzles are arranged more uniformly.

The supply nozzle is oriented in a vertically upward direction or a vertically downward direction.

When a supply branch pipe is provided for the main supply pipe, the supply pressure changes depending on the distance from the main supply pipe. Therefore, in order to make the supply amount from the supply nozzle the same, It is formed to have different sizes.

[0016]

1 is a schematic configuration diagram showing an embodiment of a floating sedimentation type separation apparatus according to the present invention.

The stationary tank 1 has a cylindrical main body 1a and an inverted conical portion 1b whose bottom surface is gradually tapered toward the center.
Consists of.

A lower discharge port 2 for discharging a substance having a high terminal speed is provided at the lower end of the inverted conical portion 1b.
The top surface of the main body 1a is formed into an arcuate surface, and an upper discharge port 3 for discharging a substance having a slow terminal velocity is provided in the center thereof.

At the intermediate portion of the main body 1a of the stationary tank 1 in the vertical direction, a main processing liquid supply pipe 4 is piped from outside the stationary tank 1 into the stationary tank 1 so as to pass through the center of the horizontal section. Is provided. In the horizontal cross section of the main body 1a of the stationary tank 1, a plurality of supply branch pipes 5 are horizontally provided so as to be orthogonal to the main supply pipe 4, and a plurality of supply nozzles 6 are provided in the supply branch pipe 5. It is installed vertically. The treatment liquid is charged from the outside of the stationary tank 1 into the stationary tank 1 through the supply main pipe 4 through the supply branch pipe 5 and the supply nozzle 6.

The lengths of the main supply pipe 4 and the supply branch pipe 5 are not particularly limited, but in order to suppress turbulence, the main supply pipe 4 and the supply branch pipe 5 are the main body of the stationary tank 1. It is preferable to extend to the wall surface of the portion 1a or the vicinity of the wall surface. The tips of the main supply pipe 4 and the supply branch pipes 5 are extended to the vicinity of the inner wall surface of the main body 1a of the stationary tank 1,
The supply nozzles 6 are arranged in a distributed manner over the entire horizontal cross section of the main body 1a of the stationary tank 1.

The supply nozzles 6 arranged in the horizontal section of the main body 1a of the stationary tank 1 are arranged such that the supply nozzles 6 are two-dimensionally arranged at equal intervals in the same horizontal section of the stationary tank 1. That is, they are arranged so as to be positioned at the vertices of a mesh-shaped regular polygon drawn by connecting the respective supply nozzles 6, and in this embodiment, they are arranged at the vertices of an equilateral triangle as shown in FIG. .

Further, the projecting amounts of the supply nozzles 6 from the supply branch pipe 5 are the same.

It is preferable that the supply amount of the processing liquid from each of the supply nozzles 6 be the same in order to further improve the classification accuracy. The method for making the supply amount of the processing liquid supplied from each supply nozzle 6 the same is not particularly limited, but, for example, the supply pressure in the supply branch pipe 5 depends on the distance from the main supply pipe 4. Since it changes, it can be performed by a method of changing the size of each supply nozzle 6.

The floating sedimentation separation apparatus according to the present invention can be used for classifying a treatment liquid in which solid particles having different terminal velocities are dispersed. The solid particles to be classified are not particularly limited, and any substance having a different terminal velocity can be applied.

As described above, the solid particles to be classified are not particularly limited, but they can be suitably used for classification of a hydrocarbon substance containing a quinoline insoluble substance and containing a condensed cyclic aromatic compound.

The liquid containing the solid particles is not particularly limited, and a solvent that does not deteriorate the particles to be classified, such as water, various buffer solutions, various organic solvents, or a mixture thereof can be used.

The preferred size of the floating sedimentation separation apparatus according to the present invention is such that the area of the horizontal cross section of the main body portion 1a of the stationary tank 1 in which each supply nozzle 6 is arranged is 0.7 to 100 m2,
The arrangement interval of each supply nozzle 6 is 0.3 to 1 m. Further, the discharge amount discharged from the upper discharge port 3 and the lower discharge port 2 is preferably about 8/9 in the upper part / lower part, whereby the classification accuracy can be further improved.

The volume of the stationary tank 1 and the supply speed of the processing liquid are not particularly limited, but the stationary tank 1
Has a volume of 10 to 200 m2 and an average residence time of 2.5
About 4.5 hours is suitable.

Further, it is desirable that the area of the portion where the supply nozzles 6 are arranged is 20% or more of the area of the horizontal cross section of the main body 1a of the stationary tank 1.

Further, when the horizontal cross-sectional shape of the main body 1a of the stationary tank 1 is circular, it is desirable that the supply nozzles 6 are arranged in a positional relationship forming an equilateral triangle. Moreover, when the horizontal cross-sectional shape of the main body 1a of the stationary tank 1 is rectangular, it is desirable that the supply nozzles 6 are arranged in a positional relationship that forms a rectangle.

Regarding the orientation of each supply nozzle 6, in the embodiment of FIG. 1, it is provided in the vertical upward direction, but this orientation is not particularly limited either, and as shown in FIG. 3, it is arranged vertically downward. Alternatively, the vertical downward direction can suppress the horizontal flow inside the stationary tank 1, so that the classification performance is improved.

The classification flow performed using the floating sedimentation type separation device according to the present invention is as follows. As shown in FIG. 4, the processing liquid stored in the storage tank 7 is supplied from the supply nozzle 6 into the stationary tank 1 via the supply main pipe 4 and the supply branch pipe 5 by driving the liquid feed pump 8. To do. At this time, the liquid feed of the treatment liquid is performed at a constant flow rate using the liquid feed pump 8.

When the treatment liquid is supplied into the stationary tank 1 and the treatment liquid is filled from below the stationary tank 1, overflow starts from the upper discharge port 3 at the upper end of the stationary tank 1. Then, the drawer is started from the lower discharge port 2 at the lower end of the stationary tank 1.
In this case, the solid particles having a desired particle size can be overflowed from the upper end of the stationary tank 1 by changing the flow rate withdrawn from the lower end of the stationary tank 1. As a result, a mixed liquid containing solid particles having a desired particle size is obtained from the upper end and the lower end of the stationary tank 1.

That is, the classification size is surely changed by changing the withdrawal ratio from the upper end and the lower end of the stationary tank 1 and adjusting the ascending and descending speed of the treatment liquid inside the stationary tank 1. You can

[0035]

As described above, in the floating sedimentation separation apparatus according to the present invention, since the treatment liquid is uniformly dispersed and supplied in the horizontal cross section of the stationary tank, turbulent flow occurs in the stationary tank. Difficult and accurate classification is possible.

[Brief description of drawings]

FIG. 1 is a schematic perspective view of an embodiment of a floating sedimentation separation apparatus according to the present invention.

2 is a cross-sectional view of FIG.

FIG. 3 is a schematic perspective view of another embodiment of the floating sedimentation separation device according to the present invention.

FIG. 4 is a schematic diagram showing a classification flow by the floating sedimentation separation apparatus according to the present invention.

FIG. 5 is a schematic cross-sectional view of a conventional floating sedimentation separation device.

[Explanation of symbols]

1 stationary tank 2 Lower outlet 3 Upper outlet 4 main supply 5 supply branch pipes 6 supply nozzles 7 storage tanks 8 Liquid feed pump

Claims (15)

[Claims] 1. A treatment liquid containing solid particles is supplied into a stationary tank, and among the solid particles in the treatment liquid, solid particles having a high terminal velocity are settled toward the bottom surface, and are provided at the center of the bottom surface. In a floating sedimentation separation device that takes out from the lower outlet and raises solid particles with a low terminal velocity and takes out from the upper outlet, supply the treatment liquid into the stationary tank within the same horizontal section of the stationary tank. In addition, the floating sedimentation separation device is characterized in that it is carried out from a plurality of supply nozzles which are uniformly dispersed. 2. The supply nozzles arranged in a horizontal cross section in the stationary tank are uniformly distributed so that the supply nozzles are located at respective vertices of a mesh-shaped regular polygon drawn by connecting the supply nozzles. The floating sedimentation separation apparatus according to claim 1. 3. The floating sedimentation separation apparatus according to claim 1, wherein the same amount of the treatment liquid is supplied from each of the supply nozzles. 4. The horizontal cross-sectional area of the stationary tank in which the supply nozzle is arranged is 0.7 to 100 m2, and the length of one side of a mesh-like regular polygon drawn by connecting the supply nozzles is 0.
The floating sedimentation separation apparatus according to any one of claims 1 to 3, which has a length of 3 to 1 m. 5. An area of a mesh-shaped regular polygon in which the supply nozzle is arranged is 20% or more of a horizontal sectional area of a stationary tank in which the supply nozzle is arranged.
4. The floating sedimentation separation device according to any one of 4 above. 6. The floating sedimentation separation apparatus according to claim 2, wherein the mesh-shaped regular polygon is a regular triangle. 7. A main supply pipe for the processing liquid, which is piped from the outside of the stationary bath so as to pass through the center of the horizontal section, is provided in the stationary bath, and a plurality of supply branches are provided so as to be orthogonal to the main supply pipe. The floating sedimentation separation apparatus according to any one of claims 2 to 6, wherein a pipe is provided horizontally, and the supply nozzle is installed in the supply branch pipe. 8. The tips of the main supply pipe and the supply branch pipes are
The floating sedimentation separation apparatus according to claim 7, which is extended to the inner wall surface of the stationary tank or to the vicinity of the inner wall surface. 9. The floating sedimentation separation apparatus according to claim 1, wherein the supply nozzle is oriented in a vertically upward direction or a vertically downward direction. 10. The floating sedimentation separation apparatus according to claim 1, wherein the supply amount of the processing liquid supplied from the supply nozzle is the same by changing the size of the supply nozzle. 11. A floating sedimentation separation method for separating substances having different terminal velocities using the floating sedimentation separation device according to any one of 1 to 10 above. 12. The floating sedimentation separation method according to claim 11, wherein the treatment liquid is a mixture of a hydrocarbon solvent and a hydrocarbon substance containing a quinoline insoluble substance and containing a condensed cyclic aromatic compound. 13. The floating sedimentation separation method according to claim 11, wherein the substance having a high terminal velocity is a quinoline insoluble substance, and the substance having a low terminal velocity is a substance other than the quinoline insoluble substance. 14. The ratio of the discharge amount discharged from the upper discharge port and the lower discharge port of the stationary tank is as follows: upper / lower = 8-9. The floating sedimentation separation method described. 15. The volume of the stationary tank is 10 to 200 m2.
And the supply speed of the treatment liquid is an average residence time of 2.5 to
It is 4.5 hours, The floating sedimentation-type separation method in any one of Claims 11-14 characterized by the above-mentioned.