Device and method for removing free moisture of ion exchange resin

Abstract

The invention discloses a device and a method for removing free moisture of ion exchange resin, a driving shaft of a motor in a main machine body of a low-speed centrifugal machine is sleeved with a water collecting tank, a horizontal rotor is fixed on the driving shaft of the motor, the horizontal rotor is located in the water collecting tank, a centrifugal tube is provided with a through hole, and the centrifugal tube is lapped on the horizontal rotor. When the low-speed centrifugal machine body is not started, the centrifugal pipes are distributed in the vertical direction, gaps are reserved between the bottoms of the centrifugal pipes and the bottom of the water collecting tank, when the low-speed centrifugal machine body is started and the centrifugal pipes are in a horizontal state, gaps are reserved between the two ends of the centrifugal pipes and the inner wall of the water collecting tank and between the two ends of the centrifugal pipes and the horizontal rotor respectively, and centrifuged water is thrown out from through holes of the centrifugal pipes. The water enters the water collecting tank, free water in the ion exchange resin can be removed, external free water and internal water can be automatically, efficiently and thoroughly separated, the operation is convenient, the condition is controllable, and the result stability is good.

Description

Technical Field

[0001] The invention relates to the field of ion exchange resin performance testing, in particular to a device and method for removing free moisture from ion exchange resin. Background Art

[0002] The ion exchange resin particles used in the field of water treatment contain a certain amount of water inside, part of which is the chemical water combined with the active groups, and the other part is the water adsorbed on the surface of the resin or retained in the gaps. When the ion exchange resin leaves the factory, an appropriate amount of desalted water will be added before packaging and supply to prevent internal moisture loss and drying damage. In addition, ion exchange resins are also processed and used in various water or solutions. In the field of testing the physical and chemical properties of ion exchange resins, such as determining its water content, exchange capacity, iron content, impurity content, and regeneration conversion rate, it is necessary to weigh a certain mass of ion exchange resin samples on the balance for subsequent testing. Before weighing, the free water outside the sample must be removed, and the water inside the sample must not be lost, otherwise it will directly affect the accuracy of the physical and chemical performance test results.

[0003] There are three main methods for removing free water from ion exchange resins disclosed at present: one is the filter paper drying method, which is to place ion exchange resin particles on filter paper and roll back and forth to absorb external free water. The advantage of this method is that it does not require additional instruments and equipment and is low in cost. The disadvantage is that the operation time is long, it consumes manpower, and there are many uncontrollable factors in the process, so the result stability is poor. The second is the suction filtration method, which is to place ion exchange resin particles in a Buchner funnel and vacuum filter to separate external free water. This method is widely used in ASTM standards. The advantage is that it is highly efficient and saves some labor costs. The disadvantage is that it is easily affected by the suction filtration conditions, but the conditions are uncontrollable, and the external free water will not be completely removed. The third method is the centrifugal method, which is to place the ion exchange resin in a glass centrifuge tube, set a sand core in the centrifuge tube to allow water to flow out and prevent the ion exchange resin particles from leaking out, then put the centrifuge tube into the sample outer sleeve of the horizontal rotor, start the centrifuge and use centrifugal force to separate the free water. This method is widely used in domestic standards, including GB / T 5757-2008 "Method for Determination of Water Content of Ion Exchange Resins" and GB / T 5759-2000 "Method for Determination of Water Content of Oxygen-Oxygen Anion Exchange Resins". The advantages of the centrifugal method are high efficiency, the ability to process multiple samples at the same time, the removal of external free water, and controllable conditions, and good result stability. The disadvantages of the centrifugal method are that the ion exchange resin particles are easily stuck in the sand core, which is not easy to clean. When there are too many residues, blockage will occur, affecting the outflow of water and making the free water separation incomplete. In addition, the free water will accumulate at the bottom of the sample outer sleeve after flowing out. If the water exceeds the height of the sand core at the bottom of the centrifuge tube, or if the centrifuge tube is removed improperly, the water will re-enter the ion exchange resin layer, causing the experiment to fail. Summary of the invention

[0004] In view of the problems existing in the prior art, the present invention provides a device and method for removing free water from ion exchange resin to solve the problem that the existing centrifugal method is prone to failure to completely separate free water due to human operating errors. The device and method can automatically and efficiently separate external free water and internal water, the operation is convenient, the conditions are controllable, and the result is stable.

[0005] The present invention is achieved through the following technical solutions: A device for removing free water from an ion exchange resin, comprising a centrifuge tube, a horizontal rotor and a low-speed centrifuge main body: A water collecting tank is sleeved on the driving shaft of the motor in the main body of the low-speed centrifuge, a horizontal rotor is fixed on the driving shaft of the motor, the horizontal rotor is located in the water collecting tank, a through hole for drainage is opened on the centrifuge tube, and the centrifuge tube is used to load the ion exchange resin to remove free water; The centrifuge tubes are overlapped on the horizontal rotor. When the low-speed centrifuge main body is not started, the centrifuge tubes are distributed in the vertical direction and a gap is left between the bottom and the bottom of the water collecting tank. When the low-speed centrifuge main body is started and the centrifuge tubes are in a horizontal state, gaps are left between the two ends of the centrifuge tubes and the inner wall of the water collecting tank and the horizontal rotor respectively.

[0006] A further improvement of the present invention is: The water collecting tank is a hollow annular structure, with a sleeve arranged in the center of the water collecting tank. The driving shaft of the motor is fixedly passed through the sleeve from bottom to top, and the center of the horizontal rotor is fixedly sleeved on the driving shaft of the motor from top to bottom. There is a gap between the upper end surface of the sleeve and the lower end surface of the horizontal rotor, and the upper end surface of the horizontal rotor is lower than the upper end surface of the motor driving shaft, and the upper end surface of the motor driving shaft is lower than the upper end surface of the water collecting tank.

[0007] The centrifuge tube is a cylindrical tube, and the bottom and the top of the centrifuge tube are both open.

[0008] The centrifuge tube is equipped with a horizontally distributed bottom plate at a distance of 0.5 cm to 1.5 cm from the bottom, the bottom plate is provided with a first through hole, and the lower part of the centrifuge tube wall is provided with a second through hole.

[0009] The first through hole and the second through hole are both long strip-shaped through holes, with a length of 1 mm to 2 mm and a width of 0.1 mm to 0.2 mm.

[0010] The first through holes are evenly arranged in 6 to 9 vertical rows on the bottom plate, and the second through holes are evenly arranged in 3 to 5 horizontal rows on the wall of the centrifuge tube. All the first through holes are parallel to each other, and all the second through holes are parallel to each other.

[0011] The centrifuge tube is a grooved centrifuge tube or a hanging basket centrifuge tube. The top of the grooved centrifuge tube is provided with a first convex ring extending from top to bottom. The first convex ring is provided with a plurality of pairs of U-shaped grooves symmetrically and evenly distributed along the radial direction. The top of the tube wall of the hanging basket centrifuge tube is provided with a second convex ring extending along the radial direction. When the centrifuge tube is a grooved centrifuge tube, a pair of limiting protrusions are provided at positions corresponding to the inner wall of the radial groove of the horizontal rotor and the U-shaped groove in the first convex ring, and the U-shaped groove of the grooved centrifuge tube overlaps the corresponding limiting protrusions; When the centrifuge tube is a hanging basket type centrifuge tube, a limiting sleeve is further provided in the horizontal rotor, and two positioning rods symmetrical along the central axis of the radial groove are fixed near the outer side of the radial groove of the horizontal rotor, and a pair of grooves are provided at positions of the limiting sleeve corresponding to the positioning rods, and the grooves are overlapped on the corresponding positioning rods. The outer diameter of the second convex ring is larger than the inner diameter of the limiting sleeve, and the hanging basket type centrifuge tube is placed in the limiting sleeve, and the bottom of the second convex ring is in contact with the upper surface of the limiting sleeve.

[0012] A method for removing free moisture from an ion exchange resin, based on the device for removing free moisture from an ion exchange resin described in any one of the above, comprises the following steps: S1, transferring the ion exchange resin sample to be freed of free water into a centrifuge tube with deionized water, then hanging it on a horizontal rotor, and closing the cover of the main body of the low-speed centrifuge; S2, start the low-speed centrifuge body, the centrifuge tube is turned from a vertical position to a horizontal position due to the radial centrifugal force, the centrifuged water is thrown out from the through hole of the centrifuge tube and enters the water collection tank, completing the removal of free water in the ion exchange resin.

[0013] Also includes S3: S3, close the low-speed centrifuge main body, open the cover of the low-speed centrifuge main body, take out the centrifuge tube, and separate the ion exchange resin sample and the water collection tank.

[0014] Compared with the prior art, the present invention has the following beneficial technical effects: The present invention provides a device for removing free water from an ion exchange resin. The device takes into account the risk of separated water directly entering the inner cavity of a centrifuge and causing damage to the instrument. A water collecting tank is provided to facilitate the collection of separated water. By overlapping a centrifuge tube on a horizontal rotor, it is not necessary to use a conventional centrifuge tube outer sleeve provided by the centrifuge. The low-speed centrifuge drives the horizontal rotor to rotate through the water collecting tank. The centrifuge tube is turned from a vertical position to a horizontal position by radial centrifugal force. Water is thrown out from the through hole of the centrifuge tube and enters the water collecting tank. Since the centrifuge tube is in a vertical state when the low-speed centrifuge is not started, a gap is left between the bottom of the centrifuge tube and the bottom of the water collecting tank, which can prevent the water in the water collecting tank from re-entering the ion exchange resin layer and causing the experiment to fail.

[0015] Furthermore, the present invention improves the conventional centrifuge tube sand core into a bottom plate with a first through hole and a second through hole at the lower part of the tube wall, and sets a suitable through hole size according to the particle size of the ion exchange resin particles, which can effectively prevent the ion exchange resin particles from leaking out while allowing free water to flow out quickly.

[0016] The invention discloses a method for removing free water from an ion exchange resin. The method comprises the following steps: the ion exchange resin sample to be freed from the water can be transferred into a centrifuge tube with deionized water, and then the centrifuge tube is hung on a horizontal rotor. After a low-speed centrifuge is started, the centrifuge tube is rotated from a vertical position to a horizontal position under the action of radial centrifugal force, and water is thrown out from a through hole of the centrifuge tube and enters a water collecting tank, so that the separated water can be conveniently collected. The experimental conditions can be controlled by setting the speed and time of the centrifuge, and human operation errors can be eliminated. The experimental results can be controlled, and the automatic and efficient removal of the external free water of the ion exchange resin is finally achieved. The operation is convenient, and the traditional method of placing the centrifuge tube into an outer sleeve of a horizontal rotor is broken through. The method has the advantages of high efficiency, low cost, and stable and controllable conditions. The method is of great significance for preparing stable samples to be tested for the determination of the physical and chemical properties of the ion exchange resin. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The present invention is a schematic diagram of a device for removing free moisture from an ion exchange resin.

[0018] Figure 2a for Figure 1 A schematic diagram with a partial cross-section view of the centrifuge body removed.

[0019] Figure 2b for Figure 1 Schematic diagram of the structure of the grey water collection tank.

[0020] Figure 3a It is a schematic diagram of the grooved centrifuge tube described in the present invention.

[0021] Figure 3b for Figure 3a A partial cross-sectional view of .

[0022] Figure 4a It is a structural schematic diagram of the hanging basket type centrifuge tube and the limiting sleeve of the present invention.

[0023] Figure 4b for Figure 4a Disassembly structure diagram.

[0024] In the figure: centrifuge tube 1, horizontal rotor 2, water collecting tank 3, low-speed centrifuge main body 4, grooved centrifuge tube 5, hanging basket centrifuge tube 6, bottom plate 7, sleeve 8, first through hole 9, second through hole 10, first convex ring 11, limit sleeve 12, second convex ring 13. DETAILED DESCRIPTION

[0025] The present invention is further described in detail below in conjunction with specific embodiments, which are intended to explain the present invention rather than to limit it.

[0026] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments and drawings, which are intended to explain the present invention rather than to limit it.

[0027] The present invention provides a device for removing free water outside an ion exchange resin, such as Figure 1 As shown, it mainly includes a centrifuge tube 1, a horizontal rotor 2, a water collection tank 3 and a low-speed centrifuge host 4: A water collecting tank 3 is movably mounted on the driving shaft of the motor in the main body 4 of the low-speed centrifuge, and a horizontal rotor 2 is fixed on the driving shaft of the motor. The horizontal rotor 2 is located in the water collecting tank 3. Figure 3a As shown, the centrifuge tube 1 is used to place ion exchange resin, the centrifuge tube is made of polymethyl methacrylate or stainless steel, and the main body is a cylindrical tube. Figure 3b As shown, the bottom and top of the centrifuge tube 1 are open, and a horizontally distributed bottom plate 7 is installed at 0.5 cm to 1.5 cm from the bottom. The bottom plate 7 is evenly provided with 6 to 9 longitudinally arranged first through holes 9 of uniform shape, with a length of 1 mm to 2 mm and a width of 0.10 mm to 0.20 mm. Each through hole is parallel to each other, so that water can flow out from the bottom plate and ensure that the ion exchange resin particles do not leak out. The lower part of the tube wall of the centrifuge tube 1 is also provided with 3 to 5 transversely arranged second through holes 10 of uniform shape, with a length of 1 mm to 2 mm and a width of 0.1 mm to 0.2 mm. Each through hole is parallel to each other, so that free water can also flow out from the side of the centrifuge tube 1, reducing the centrifugation time. At the same time, the centrifuge tube 1 is easy to process, resistant to falling and durable.

[0028] like Figure 2a As shown, the upper part of the outer wall of the centrifuge tube 1 filled with ion exchange resin can be directly hung on the horizontal rotor 2. When the low-speed centrifuge main body 4 is not started, the centrifuge tube 1 is distributed in the vertical direction and a gap is left between the bottom and the bottom of the water collecting tank 3. When the centrifuge tube 1 is in a horizontal state, the two ends of the centrifuge tube 1 respectively leave gaps with the inner wall of the water collecting tank 3 and the horizontal rotor 2. During use, it does not affect the rotation of the horizontal rotor 2 and can collect water thrown out of the centrifuge tube 1 to prevent water from entering the centrifuge and damaging the machine. After the low-speed centrifuge main body 4 is turned on, the water collecting tank 3 remains stationary, and the centrifuge tube 1 is turned from a vertical position to a horizontal position under the action of radial centrifugal force. Water is thrown out from the through holes on the bottom plate and the side of the centrifuge tube and enters the water collecting tank 3. After the centrifugation is completed, the centrifuge tube 1 is removed and the ion exchange resin is poured into the weighing box.

[0029] The upper part of the outer wall of the centrifuge tube 1 can be Figure 3a The grooved or Figure 4a , Figure 4b The two hanging basket shapes shown are respectively a grooved centrifuge tube 5 or a hanging basket centrifuge tube 6 . Figure 3a As shown, a first convex ring 11 is provided on the top of the grooved centrifuge tube 5 extending from top to bottom, and a plurality of pairs of U-shaped grooves are evenly and symmetrically distributed in the radial direction on the first convex ring 11. A second convex ring 13 is provided on the top of the tube wall of the hanging basket centrifuge tube 6 extending in the radial direction.

[0030] When a grooved centrifuge tube 5 is selected, a pair of limiting protrusions are provided at positions corresponding to the inner wall of the radial groove of the horizontal rotor 2 and the U-shaped groove in the first convex ring 11, and the U-shaped groove of the grooved centrifuge tube 5 overlaps the corresponding limiting protrusions. When a hanging basket centrifuge tube 6 is selected, the horizontal rotor 2 also needs to be additionally designed with a limiting sleeve 12. Two positioning rods symmetrical along the central axis of the radial groove are fixed near the outer side of the radial groove of the horizontal rotor 2. The limiting sleeve 12 is provided with a pair of grooves at positions corresponding to the two positioning rods, and each groove overlaps the corresponding positioning rod. The outer diameter of the second convex ring 13 is larger than the inner diameter of the limiting sleeve 12. The hanging basket centrifuge tube 6 can be placed in the limiting sleeve 12, and the hanging basket centrifuge tube 6 is installed by contacting the bottom of the second convex ring 13 with the upper surface of the limiting sleeve 12. In this way, the grooved centrifuge tube 5 or the hanging basket centrifuge tube 6 can be overlapped on these two different types of horizontal rotors 2. For convenience, Figure 2a The above two different types are collectively drawn out, and a groove type centrifuge tube 5 or a hanging basket type centrifuge tube 6 is placed respectively.

[0031] like Figure 2b As shown, the water collecting tank 3 of the present invention is a hollow ring shape, and the horizontal rotor 2 is installed in the hollow part. A sleeve 8 is arranged at the center of the water collecting tank 3, and the driving shaft of the motor is fixedly penetrated through the sleeve 8 from bottom to top. The center of the horizontal rotor 2 is fixedly sleeved on the driving shaft of the motor from top to bottom. There is a gap between the upper end surface of the sleeve 8 and the lower end surface of the horizontal rotor 2. The upper end surface of the horizontal rotor 2 is lower than the upper end surface of the motor driving shaft, and the upper end surface of the motor driving shaft is lower than the upper end surface of the water collecting tank 3. The height of the side wall of the sleeve 8 does not affect the centrifuge tube 1 turning to a horizontal direction under the action of centrifugal force during the centrifugation process.

[0032] The ion exchange resin free water removal device of the present invention is provided with a water collecting tank, which fully considers the risk of the separated water directly entering the inner cavity of the centrifuge and causing damage to the instrument, and is convenient for collecting the separated water. By overlapping the centrifuge tube on the horizontal rotor, there is no need to use the conventional centrifuge tube outer sleeve of the centrifuge. The low-speed centrifuge drives the horizontal rotor to rotate through the water collecting tank, and the centrifuge tube is turned from a vertical position to a horizontal position under the action of radial centrifugal force. Water is thrown out from the through hole of the centrifuge tube and enters the water collecting tank. When the low-speed centrifuge is not started, the centrifuge tube is in a vertical state, and a gap is left between its bottom and the bottom of the water collecting tank to prevent the water in the water collecting tank from re-entering the ion exchange resin layer.

[0033] The present invention provides a method for removing free water outside an ion exchange resin, based on the above device, comprising the following steps: The first step is to select a suitable centrifuge tube 1 according to the type of horizontal rotor, transfer an appropriate amount of ion exchange resin sample into it with deionized water, adjust the upper surface of the sample to be flush, and the distance between the ion exchange resin layer and the upper edge of the centrifuge tube is not less than 1 cm. When processing multiple ion exchange resin samples at the same time, considering the balance of the centrifuge, the mass of the ion exchange resin samples in the centrifuge tube needs to be controlled to be similar; The second step is to fix the sleeve 8 of the water collection tank 3 to the driving shaft of the motor in the low-speed centrifuge body 4, with the bottom contacting the bottom of the inner cavity of the low-speed centrifuge body 4, and then hang a number of centrifuge tubes 1 containing ion exchange resin samples on the horizontal rotor 2, and the center of the horizontal rotor 2 is fixedly sleeved on the driving shaft of the motor from top to bottom, close the cover of the low-speed centrifuge body 4, set the speed and time, and start the low-speed centrifuge body 4; The third step is to close the low-speed centrifuge body 4 after the centrifugation is completed, open the machine cover, take out the centrifuge tube 1, and pour the ion exchange resin sample into a weighing box with a cover for standby use; The fourth step is to take out the water collection tank 3 in the low-speed centrifuge, pour out the water therein, and finally remove the free water of the ion exchange resin.

[0034] Example 1 The present invention provides a method for removing free water from an ion exchange resin, wherein a device is used, and a grooved centrifuge tube 5 is used, and specifically comprises the following steps: In the first step, the ion exchange resin samples are transferred into two grooved centrifuge tubes 5 with deionized water, and the distance between the ion exchange resin layer and the upper edge of the centrifuge tube is 1.5 cm.

[0035] The second step is to fix the sleeve 8 of the water collection tank 3 to the drive shaft of the motor in the low-speed centrifuge body 4, and then hang two grooved centrifuge tubes 5 containing ion exchange resin samples on the matching limiting protrusions of the radial grooves of the horizontal rotor 2, place them in the diagonal position, and the center of the horizontal rotor 2 is fixedly sleeved on the drive shaft of the motor from top to bottom, close the cover of the low-speed centrifuge body 4, set the speed to 2500 r / min, the time to 5 min, and start the centrifuge body 4; The third step is to close the low-speed centrifuge body 4 after the centrifugation is completed, open the machine cover, take out the grooved centrifuge tube 5, and pour the ion exchange resin sample into a weighing box with a cover for standby use; The fourth step is to take out the water collection tank 3 in the low-speed centrifuge, pour out the water therein, and finally remove the free water of the ion exchange resin.

[0036] Example 2 The present invention provides a method for removing free water from an ion exchange resin, wherein a device is used, and a hanging basket centrifuge tube 6 is used, and specifically comprises the following steps: In the first step, the ion exchange resin samples are transferred into four hanging basket centrifuge tubes 6 with deionized water, and the distance between the ion exchange resin layer and the upper edge of the centrifuge tube is 2 cm.

[0037] The second step is to fix the sleeve 8 of the water collection tank 3 to the drive shaft of the motor in the low-speed centrifuge body 4, and then vertically pass four hanging basket centrifuge tubes 6 containing ion exchange resin samples through the limiting sleeve 12 of the horizontal rotor 2, and hang the hanging basket centrifuge tubes 6 through the second convex ring 13. The center of the horizontal rotor 2 is fixedly sleeved on the drive shaft of the motor from top to bottom, close the cover of the low-speed centrifuge body 4, set the speed to 2000 r / min, the time to 8 min, and start the centrifuge body 4; The third step is to close the low-speed centrifuge body 4 after the centrifugation is completed, open the machine cover, take out the hanging basket centrifuge tube 6, and pour the ion exchange resin sample into a weighing box with a cover for standby use; The fourth step is to take out the water collection tank 3 in the low-speed centrifuge, pour out the water therein, and finally remove the free water of the ion exchange resin.

[0038] The method for removing free water from an ion exchange resin of the present invention comprises the following steps: transferring an ion exchange resin sample into a centrifuge tube with deionized water, and then hanging the centrifuge tube on a horizontal rotor; after a low-speed centrifuge is started, the centrifuge tube is rotated from a vertical position to a horizontal position under the action of radial centrifugal force, and water is thrown out from a through hole of the centrifuge tube into a water collecting tank, so that the separated water can be conveniently collected; experimental conditions can be controlled by setting the speed and time of the centrifuge, so that human operation errors can be eliminated, and experimental results can be controlled, thereby finally realizing the automatic and efficient removal of external free water from the ion exchange resin; the operation is convenient, and a traditional method of placing a centrifuge tube into an outer sleeve of a horizontal rotor is broken through; the method has the advantages of high efficiency, low cost, and stable and controllable conditions, and a stable sample to be tested is prepared for the determination of the physical and chemical properties of the ion exchange resin.

Claims

1. A device for removing free water from ion exchange resin, characterized in that: It comprises a centrifuge tube (1), a horizontal rotor (2) and a low-speed centrifuge host body (4): A water collecting tank (3) is sleeved on the driving shaft of the motor in the main body (4) of the low-speed centrifuge, a horizontal rotor (2) is fixed on the driving shaft of the motor, the horizontal rotor (2) is located in the water collecting tank (3), a through hole for drainage is opened on the centrifuge tube (1), the centrifuge tube (1) is used to load the ion exchange resin to remove free water, and the centrifuge tube (1) is overlapped on the horizontal rotor (2); When the low-speed centrifuge body (4) is not started, the centrifuge tubes (1) are distributed in a vertical direction and a gap is left between the bottom and the bottom of the water collecting tank (3); when the low-speed centrifuge body (4) is started, the centrifuge tubes (1) are in a horizontal state, and gaps are left between the two ends of the centrifuge tubes (1) and the inner wall of the water collecting tank (3) and the horizontal rotor (2), respectively.

2. The device for removing free moisture from ion exchange resin according to claim 1, characterized in that: The water collecting tank (3) is a hollow annular structure. A sleeve (8) is arranged at the center of the water collecting tank (3). The drive shaft of the motor is fixedly inserted through the sleeve (8) from bottom to top. The center of the horizontal rotor (2) is fixedly sleeved on the drive shaft of the motor from top to bottom. A gap is left between the upper end surface of the sleeve (8) and the lower end surface of the horizontal rotor (2). The upper end surface of the horizontal rotor (2) is lower than the upper end surface of the drive shaft of the motor. The upper end surface of the drive shaft of the motor is lower than the upper end surface of the water collecting tank (3).

3. The device for removing free moisture from ion exchange resin according to claim 1, characterized in that: The centrifuge tube (1) is a cylindrical tube, and the bottom and top of the centrifuge tube (1) are both open.

4. The device for removing free moisture from ion exchange resin according to claim 3, characterized in that: The centrifuge tube (1) is equipped with a horizontally distributed bottom plate (7) at a distance of 0.5 cm to 1.5 cm from the bottom, and a first through hole (9) is provided on the bottom plate (7).

5. The device for removing free moisture from ion exchange resin according to claim 4, characterized in that: A second through hole (10) is provided at the lower part of the wall of the centrifuge tube (1).

6. The device for removing free moisture from ion exchange resin according to claim 5, characterized in that: The first through hole (9) and the second through hole (10) are both long strip-shaped through holes, each having a length of 1 mm to 2 mm and a width of 0.1 mm to 0.2 mm.

7. The device for removing free moisture from ion exchange resin according to claim 5, characterized in that: The first through holes (9) are evenly arranged in 6 to 9 vertical rows on the bottom plate (7), and the second through holes (10) are arranged in 3 to 5 horizontal rows on the wall of the centrifuge tube (1). All the first through holes (9) are parallel to each other, and all the second through holes (10) are parallel to each other.

8. The device for removing free moisture from ion exchange resin according to claim 3, characterized in that: The centrifuge tube (1) is a grooved centrifuge tube (5) or a hanging basket centrifuge tube (6); a first convex ring (11) is provided on the top of the grooved centrifuge tube (5) extending from top to bottom; the first convex ring (11) has a plurality of pairs of U-shaped grooves symmetrically and evenly distributed along the radial direction; a second convex ring (13) is provided on the top of the tube wall of the hanging basket centrifuge tube (6) extending along the radial direction; When the centrifuge tube (1) is a grooved centrifuge tube (5), a pair of limiting protrusions are provided at positions corresponding to the inner wall of the radial groove of the horizontal rotor (2) and the U-shaped groove in the first convex ring (11), and the U-shaped groove of the grooved centrifuge tube (5) overlaps the corresponding limiting protrusions; When the centrifuge tube (1) is a hanging basket type centrifuge tube (6), a limiting sleeve (12) is further provided in the horizontal rotor (2); two positioning rods symmetrical along the central axis of the radial groove are fixed at positions close to the outer side of the radial groove of the horizontal rotor (2); a pair of grooves are provided at positions of the limiting sleeve (12) corresponding to the positioning rods; the grooves overlap the corresponding positioning rods; the outer diameter of the second convex ring (13) is greater than the inner diameter of the limiting sleeve (12); the hanging basket type centrifuge tube (6) is placed through the limiting sleeve (12); and the bottom of the second convex ring (13) contacts the upper surface of the limiting sleeve (12).

9. A method for removing free water from an ion exchange resin, characterized in that: The device for removing free moisture from ion exchange resin according to any one of claims 1 to 8 comprises the following steps: S1, transferring the ion exchange resin sample from which free water is to be removed into a centrifuge tube (1) with deionized water, then hanging it on a horizontal rotor (2), and closing the cover of the main body (4) of the low-speed centrifuge; S2, starting the low-speed centrifuge body (4), the centrifuge tube (1) is rotated from a vertical position to a horizontal position under the action of radial centrifugal force, and the centrifuged water is thrown out from the through hole of the centrifuge tube (1) and enters the water collection tank (3), thereby completing the removal of free water in the ion exchange resin.

10. The method for removing free moisture from ion exchange resin according to claim 9, characterized in that: Also includes S3: S3, closing the low-speed centrifuge main body (4), opening the cover of the low-speed centrifuge main body (4), taking out the centrifuge tube (1), and separating the ion exchange resin sample and the water collection tank (3).

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