JPS5929299B2 - Resin wet classification method and device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention deals with unnecessary fine particles, fine powders, and coarse particle resins that are unavoidably produced as by-products in the production of small spherical resins (hereinafter simply referred to as resins) such as ion exchange resins. The present invention relates to a wet classification method and apparatus for separating resins.

If unclassified resin is taken as the population, a particle size distribution can be created centering on resin within specifications into coarse particles and fine particles.

In conventional dry classification using a sieve, it is easy to remove coarse particles, but the removal of fine particles and fine powder is insufficient due to their close contact with the coarse particles.

In addition, conventional wet classification only separates fine powder, fine particles, and broken spheres, which cause inconvenience during wastewater treatment, from resins that meet specifications.

As a result of research to overcome these drawbacks, the present invention uses a wet classifier in which a plurality of lattice cylinders are installed in the column length direction with intervals, and an outlet is provided on the wall of the space between the lattice parts. In this way, the above-mentioned drawbacks have been solved and the present invention has been achieved.

That is, in the present invention, a predetermined amount of unclassified resin is introduced in the form of a slurry into a classification tower in which a plurality of grid cylinders are installed at intervals in the direction of the tower length, and rising fluid is supplied from the lower part of the hind limb tower to fluidize the resin. This wet classification method for resin is characterized in that after forming a particle size distribution in the column length direction, resin of a desired particle size is discharged from a resin outlet provided on the column wall surface in the space between the lattice parts, and the present invention The apparatus for carrying out the method is equipped with a plurality of lattice cylinders spaced apart from each other in the lengthwise direction of the column excluding the upper and lower parts, and a resin inlet and an appropriate number of resin ports are installed on the wall of the classification tower between the lattice parts. Provide an outlet and return water pipe to the top of the tower,
This is a wet classifier equipped with a circulating water transfer pipe at the bottom of the column.

In the present invention, several resin outlets are provided at equal intervals in the column length direction on the side of the classification group (hereinafter simply referred to as column), and light and heavy resin layers are formed in the column by a certain amount of upward flow supplied from the bottom of the column. It is possible to distribute and extract resin of any particle size from the outlet where the resin of particle size that needs to be extracted is present while keeping it in a suspended state, and the lattice tube installed inside the tower allows it to be lifted in the direction of the tower length. It is characterized by uniformly extracting the resin in the horizontal direction without disturbing the flow.

Next, an example of implementation of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a cross-sectional view showing an embodiment of the apparatus of the present invention. In the figure, 1 is a column for performing classification, and the upper and lower parts are configured in the shape of mirror plates, and a circulating water pump that generates an upward flow in the center of the lower mirror plate. A circulating water transfer pipe 2 is connected to the pipe (not shown).

In addition, a water collection plate 3 is provided at the boundary between the inner straight body of the tower 1 and the lower head plate, and the water collection plate 3 has the purpose of uniformly circulating water inside the tower and preventing backflow of resin in the tower. Screw on the slit ball 4.

A standard resin outlet 5 is connected to the side of the tower directly above the water collection plate, and the tower 1
Several resin outlet ports 6 are connected at equal intervals in the column length direction of the side wall.

Inside the tower, a lattice cylinder 7 is installed horizontally with each resin outlet 6, with the upper ends aligned, and there is a gap of 50M between the next stage lattice cylinder.
/M to 100M/M, respectively, are provided with side-side extraction cavities.

FIG. 2 is a detailed perspective view of the lattice cylinder 7.

In the figure, reference numeral 8 denotes a resin inlet for charging slurry resin into the tower 1, and a check valve 9 for preventing backflow is installed at the inlet of the tower.

In the figure, 10 is a return water pipe, and in order to return the circulating water that creates an upward flow from the return water pipe 10, the pipe opening is connected to the side of the tower located in the center of the tower 1, but the return water pipe 10 is a natural flow. Therefore, a pipe diameter larger than that of the circulating water transfer pipe 2 is required.

In the figure, 11 is a sprinkler pipe for cleaning the tower that also serves as the water supply for tower 1.
A ring-shaped tube is attached along the inner wall.

The purpose of the limb tube 11 is to clean the resin adhering to the inner wall of the tower and the lattice tube 7 after classification, so it is a ring-shaped tube with hundreds of holes with varying angles so that the resin is uniformly scattered downward. It is.

A viewing window 12 for checking the state of the resin in the tower 1 is installed on the side of the tower 1 above the resin inlet 8.

Next, the order of operation of the apparatus of the present invention will be explained. First, all the valves directly connected to the column 1 are closed, and then water is sprayed from the sprinkler pipe 11 and the water is stored above the resin feed port 8.

The purpose of storing water is to prevent the slurry resin being charged from trapping air bubbles and interfering with classification.

Next, a slurry pump (not shown) is used to feed the resin from the resin storage tank (not shown) through the resin charging port 8 and the check valve 9 to the classification tower 1.
A predetermined amount of slurry resin is charged into tower 1 while maintaining the internal water level.

In order to maintain the water level in the classification tower 1, an overflow pipe (not shown) is provided that reaches the water storage level at the start of operation through the water collecting plate 3, slit balls 4, and the lattices of the lattice cylinder group, and the overflow pipe Only the water needs to be drained.

Next, after the slurry resin is loaded, each valve in the circulating water system is opened to drive the circulating water pump, and the upward flow through the circulating water transfer pipe 2, water collection plate 3, and slit ball 4 causes the resin in the tower 1 to float, and the return water pipe Classification is started while draining water from 10, but it is necessary to remove the air inside the pipe before operating a circulating water pump (not shown).

Furthermore, it is important to adjust the control valve in advance to maintain a constant flow rate, and then fine-tune the flow rate using a flow meter after the start of operation.

The position of the top surface of the floating developing resin is confirmed through the viewing window 12.
A small amount of fine powder floating above the top of the resin will be discharged to the outside of the tower 1 through the return water pipe 10 in about 2 hours, and the particle size distribution of the resin in the tower will be formed in about 4 hours, so the classification work will be completed. finish.

Further, the upward flow is continued, and the coarse particle resin is discharged from the lower part of the classification tower 1, and the fine particle resin is discharged from a predetermined resin outlet 6 at the upper part.

After discharging the fine particles and coarse particle resin, the total amount of the standard resin remaining in the column is extracted from the standard resin extraction port 5 to complete the classification of the ion exchange resin of the present invention, but the upward flow forms the particle size distribution of the resin. After that, it is also possible to directly discharge the standard resin from a predetermined resin outlet 6.

As described above, the method and apparatus of the present invention can completely classify ion exchange resins in a short period of time, discharge fine powder resin to the outside of the column together with circulating water, and arbitrarily select resin particles from fine particles to coarse particle resins. It has an excellent function that can be excluded.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the wet classifier according to the present invention, and FIG. 2 is a perspective view of a lattice tube. 1... Classifying tower, 2... Circulating water transfer pipe,
3...Water collection plate, 4...Slit ball, 5...Standard resin outlet, 6...Resin outlet, 7...・Grate tube, 8...Resin charging port, 9...Check valve, 10...Return water pipe, 11...Water pipe for cleaning inside the tower, 12...
...Peephole.

Claims (1)

[Scope of Claims] 1. A predetermined amount of unclassified resin is introduced in the form of slurry into a classification tower in which a plurality of grid cylinders are installed at intervals in the direction of the tower length, and then a rising fluid is supplied from the lower part of the tower, A wet classification method for resin, which comprises fluidizing the resin to form a particle size distribution in the column length direction, and then discharging resin of a desired particle size from a resin outlet provided on the column wall in the space between the lattice sections. . 2. In a classification group that sorts resins by particle size, a plurality of grid cylinders are installed at intervals in the column length direction excluding the upper and lower parts, and a resin charging port and an appropriate number of resin charging ports are installed on the wall surface of the classification tower between the grid parts. A wet classifier for resin, which is provided with a resin outlet, a return water pipe in the upper part of the tower, and a circulating water transfer pipe in the lower part of the tower.