Method and device for measuring strength of ion exchange resin

Abstract

The invention belongs to the technical field of ion exchange resin detection, and particularly discloses a method and a device for determining the strength of ion exchange resin. Through the ion exchange resin sphericity measuring device, ion exchange resin particles are photographed, the images are processed, the number of different types of images and the average equivalent particle size of the particles are counted, the sphericity of the ion exchange resin is obtained, and the sphericity of the ion exchange resin is measured by simulating the change of the sphericity of the ion exchange resin before and after the adverse factors are applied. The quantitative measurement on the strength of the ion exchange resin is realized. The determination method is efficient and good in reproducibility, and can be used for quality control of ion exchange resin.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of ion exchange resin detection, and particularly relates to a method and device for measuring the strength of ion exchange resin. BACKGROUND

[0002] Ion exchange resin exchanges ions in solution with exchangeable ions on its polymer skeleton to remove ions in solution. Normally, the shape of ion exchange resin particles is spherical. Due to stress impact caused by water flow impact, acid and alkali solution immersion, and external force such as friction and extrusion between particles or between particles and a container in actual use, the originally spherical resin particles are broken into non-spherical small particles or even powder. Broken ion exchange resin particles flow out of the resin bed with water flow, which not only affects the exchange capacity of the water treatment device and the water quality, but also migrates to various parts of the system, causing pipeline blockage, device accidents or pollution. Therefore, the evaluation of the strength of ion exchange resin particles is an important part of the performance evaluation of ion exchange resin. The existing resin strength method is to manually separate the non-spherical part from the spherical part after the resin is impacted by simulated use conditions, and then calculate the spherical rate by weighing, which has the disadvantages of low efficiency, poor repeatability, and results greatly affected by the experience and subjective judgment of the experimenter. Moreover, the initial state of the resin is not determined, and the true strength of the resin cannot be objectively reflected. SUMMARY

[0003] The application aims to provide a method and device for measuring the strength of ion exchange resin to solve the problems of low efficiency, poor repeatability, and results greatly affected by the experience and subjective judgment of the experimenter in the current identification method.

[0004] To achieve the above-mentioned purpose, the application adopts the following technical solutions: A device for measuring the strength of ion exchange resin, comprising a computer, a macro camera, a magnifying lens group, a sample feeder, a sample cell, a background light source, a circulating pump and a pipeline; Known standard sample particles are added to the sample feeder, and the water flow is driven by the circulating pump to make the standard sample particles circulate in the pipeline. When the standard sample particles pass through the sample cell, the macro camera captures images, the background light source provides illumination, and the images are captured by the macro camera after being magnified by the magnifying lens group. The number of captured images is set according to the test requirements; Or a certain volume of shaped resin sample is added to the sample feeder, and the water flow is driven by the circulating pump to make the resin circulate in the pipeline. When the resin particles pass through the sample cell, the macro camera continuously captures nThe image of the resin is provided with light by a background light source, and the image is captured by a macro camera after being enlarged by a lens group, and the number of the captured images can be set according to the test requirement; the image size of each test sample is compared with that of a standard sample by a computer, and the equivalent particle diameter of the shaped resin particles in each image is calculated d i .

[0005] The computer can distinguish the images of the complete spherical particles or the broken non-spherical particles, and the number of the images of the spherical particles is counted n 圆 from the number of the broken particles n 碎 , and the equivalent particle diameter of each particle is calculated respectively.

[0006] The volume of the complete spherical particles and the volume of the broken resin particles are calculated according to the equivalent particle diameter in each image and the number of the images, that is:

[0007] .

[0008] A method for measuring the strength of an ion exchange resin, which is based on a device for measuring the strength of the ion exchange resin, comprising: The ion exchange resin sample is shaped to ensure that the sample is in a certain and stable form during the measurement; The shaped ion exchange resin sample with a certain volume is measured, and is put into the device for measuring the strength of the ion exchange resin to calculate the sphericity of the ion exchange resin particles; The shaped ion exchange resin sample with the same volume is measured, and is subjected to various adverse factors according to the use environment of the resin; The resin subjected to various adverse factors is put into the device for measuring the strength of the ion exchange resin to calculate the sphericity of the ion exchange resin particles; The strength of the ion exchange resin is evaluated by the change of the sphericity of the ion exchange resin before and after the adverse factors are applied.

[0009] The strength of the ion exchange resin is evaluated by the change of the sphericity of the ion exchange resin before and after the adverse factors are applied. D The definition of the strength is the change of the sphericity of the ion exchange resin before and after the adverse factors are applied, that is: D = ω 前 - ω 后 .

[0010] The definition of the strength is the change of the sphericity of the ion exchange resin before and after the adverse factors are applied, that is: ωThe definition is: the proportion of the volume of complete spherical particles in the total volume of the resin, that is:

[0011] The total volume of the resin is the sum of the volume of the complete spherical particles and the volume of the broken resin particles.

[0012] The further improvement of the present application is that the simulated adverse factors include the water flow impact force on the ion exchange resin particles, the stress generated by the acid and alkali solution immersion, and the friction and extrusion external force between the particles or between the particles and the container.

[0013] The further improvement of the present application is that, due to the different strengths of different types and brands of resin particles, after the application of adverse factors, different proportions of the resin particles are broken and converted from spherical particles to broken particles.

[0014] The further improvement of the present application is that the simulated water flow impact force and the stress generated by the acid and alkali solution immersion are achieved by adding acid and alkali solution to the resin located in the exchange column through a pump.

[0015] The further improvement of the present application is that the simulated friction and extrusion adverse factors are achieved by using a ball mill to ball mill the resin particles.

[0016] Compared with the prior art, the present application has at least the following beneficial technical effects: The present application provides a method and device for measuring the strength of ion exchange resin. The spherical rate of ion exchange resin before and after the application of adverse factors is measured by the ion exchange resin strength measuring device, and the accurate and rapid evaluation of the strength performance of the resin under different use scenarios is achieved by calculating the change of the spherical rate. The problem that the existing method cannot evaluate the strength of ion exchange resin under specific use conditions is solved. The method is efficient, low in cost, and good in reproducibility, and can be used for quality control of ion exchange resin. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0018] Figure 1 It is a schematic diagram of the ion exchange resin strength measuring device of the present application; Figure 2 It is an image of the original resin sample presented by the ion exchange resin strength measuring device in Example 1 and the equivalent particle size; Figure 3 Images and equivalent particle diameters of the resin samples after applying simulated adverse factors for the ion exchange resin strength measurement device presented in Example 1.

[0019] Figure 4 Images and equivalent particle diameters of the original resin samples for the ion exchange resin strength measurement device presented in Example 2; Figure 5 Images and equivalent particle diameters of the resin samples after applying simulated adverse factors for the ion exchange resin strength measurement device presented in Example 2. DETAILED DESCRIPTION

[0020] Hereinafter, certain exemplary embodiments are described simply. As can be recognized by those skilled in the art, the described embodiments can be modified in various different ways without departing from the spirit or scope of the present application. Therefore, the drawings and descriptions are to be regarded as illustrative in nature rather than restrictive.

[0021] In the description of the present application, it is to be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like are based on the orientations or positional relationships shown in the drawings, and are merely for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be construed to indicate or imply that the devices or elements indicated thereby must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be construed as limiting the present application.

[0022] In addition, the terms "first", "second", etc. are used only for the purpose of description, and cannot be construed as indicating or implying relative importance or implicitly indicating the number of the technical features indicated thereby. Therefore, the features defined with "first", "second", etc. can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0023] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "fixing", and the like should be understood broadly, for example, can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection, or communication; can be direct connection, or indirect connection through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0024] In the present application, unless specifically stated and limited otherwise, the "on" or "under" of a first feature to a second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the "on", "above" and "over" of a first feature to a second feature includes that the first feature is directly above and obliquely above the second feature, or only means that the first feature is horizontally higher than the second feature. The "under", "below" and "underneath" of a first feature to a second feature includes that the first feature is directly above and obliquely above the second feature, or only means that the first feature is horizontally lower than the second feature.

[0025] It should be understood that the terms "comprises" and "comprising" when used in this specification and the following claims indicate the presence of the described features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0026] It should also be understood that the terms used in the present specification and the following claims are only for the purpose of describing particular embodiments and do not intend to limit the present application. As used in the present specification and the following claims, the singular forms "a", "an" and "the" are intended to include the plural forms unless the context clearly indicates otherwise.

[0027] It should be further understood that the term "and / or" used in the present specification and the following claims means any combination of one or more of the associated listed items and all possible combinations, and includes these combinations.

[0028] Various structural diagrams according to the disclosed embodiments of the present application are shown in the accompanying drawings. These drawings are not drawn to scale, in which certain details are exaggerated for the purpose of clarity and certain details can be omitted. The shapes of various regions, layers and their relative sizes and positional relationships shown in the drawings are only exemplary, and in actuality can be deviated due to manufacturing tolerances or technical limitations, and regions / layers with different shapes, sizes and relative positions can be additionally designed by those skilled in the art according to actual needs.

[0029] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0030] The sphericity is the ratio of the total volume of the complete spherical resin particles to the total volume of all the resin particles, and when the resin has high strength, the sphericity decreases slightly before and after the resin is subjected to stress impact generated by water flow impact, acid and alkali solution immersion, external force such as friction and extrusion between particles or between the particles and the container, and other adverse factors, while the sphericity of the resin with poor strength decreases greatly after the resin is subjected to the adverse factors, so the strength of the resin can be determined by the sphericity of the resin particles before and after the adverse factors are applied.

[0031] The present application is based on in-depth research on the physical and chemical properties of ion exchange resin, and establishes a simple and feasible method for quickly determining the strength of the resin, which has important practical technical value and economic value.

[0032] Example 1 The present application provides a method for determining the strength of ion exchange resin, comprising the following steps: 1. The ion exchange resin sample is shaped to ensure that the sample is in a determined and stable form during the measurement; 2. The standard sample particles with a known particle size are added to the sample injector, the water flow is driven by the circulating pump, the standard sample particles circulate in the pipeline with the water flow, the standard sample particles pass through the sample cell, the background light source provides light, the image is enlarged by the magnifying lens group and captured by the macro camera, and the number of images can be set according to the test requirements.

[0033] 3. The shaped resin sample with a set volume is added to the sample injector, the water flow is driven by the circulating pump, the resin circulates in the pipeline with the water flow, the resin particles pass through the sample cell, the background light source provides light, the image is enlarged by the magnifying lens group and captured by the macro camera, and the number of images can be set according to the test requirements. n d i The computer compares the image size of the standard sample with each test sample to calculate the equivalent particle size of the shaped resin particles in each image. n 圆 The computer distinguishes the images of complete spherical particles or broken non-spherical particles, counts the number of spherical particle images n 碎 and the number of broken particles

[0034] 4. The total volume of the complete spherical particles V 圆 and the total volume of the broken non-spherical particles V 碎 are calculated respectively, and the sphericity of the shaped resin ω 前 is calculated.​

[0035]

[0036]

[0037]

[0038] 5. Measure the same volume of resin as in 2, according to the use environment of the resin, simulate the application of various adverse factors to the resin. The simulated water flow impact force, stress produced by acid and alkali solution immersion and other adverse factors can be achieved by adding acid and alkali solution of certain concentration and flow rate to the resin located in the exchange column, and the simulated friction, extrusion and other adverse factors can be achieved by ball milling.

[0039] 6. Put the resin subjected to various simulated adverse factors into the ion exchange resin strength measuring device, and calculate the sphericity of the ion exchange resin particles after the application of adverse factors according to the steps 2-4. ω 后 ); 7. Evaluate the strength of the ion exchange resin by the change of the sphericity of the ion exchange resin before and after the application of adverse factors. D 。

[0040] D = ω 前 - ω 后 The ion exchange resin strength measuring device comprises a computer 1, a macro lens 2, a magnifying lens group 3, a sample feeder 4, a sample cell 5, a background light source 6, a circulating pump 7 and a pipeline 8.

[0041] Example 2 The ion exchange resin strength measuring device comprises a computer 1, a macro lens 2, a magnifying lens group 3, a sample feeder 4, a sample cell 5, a background light source 6, a circulating pump 7 and a pipeline 8. S1: Shape the resin sample to be measured Specifically, about 60 mL of D301 type anion exchange resin is placed in the exchange column, and sodium hydroxide solution is added to the exchange column to make the form of the D301 type anion exchange resin all in the hydrogen form. At this time, the resin sample form is determined and stable, ensuring that the diameter of each resin particle will not change during the detection process.

[0042] S2: Measure the standard sample The standard particle size microsphere sample with a diameter of 0.500 mm is added to the ion exchange resin particle sphericity measuring device, and the camera transmits the image of the 0.500 mm standard particle size microsphere sample to the computer, and the computer obtains the average diameter of 10 images as 386 pixel units.

[0043] S3: Measure the sphericity of the original resin sample; With a measuring cylinder, 15 mL of the shaped resin was accurately measured and added to the ion exchange resin particle sphericity measuring device. The camera transmitted 500 resin sample images to the computer. The computer determined that 483 of the images were complete spherical particle images and 17 were broken particle images. According to the 0.500 mm microsphere image diameter of 386 pixel units in the S1 step, the equivalent diameters of the 483 complete spherical particles (respectively d 1~ d 483 ) and the equivalent diameters of the 17 broken particles (respectively d ’ 1~ d ’ 17 ) were calculated, as shown in Table 1. Figure 2

[0044] The sphericity of the original resin sample was calculated:

[0045] S4: Simulate the application of adverse factors to the resin sample.

[0046] After the D301 type ion exchange resin is used up, it is usually regenerated using sodium hydroxide. After the resin particles come into contact with sodium hydroxide, stress generated by chemical reactions can cause some of the resin particles to break. Therefore, sodium hydroxide solution was used to elute the resin sample to simulate the adverse factors during the resin regeneration process in daily use. At the same time, during the process of the resin particles being transported in the water flow in the container, they will rub against each other or collide with the inner wall of the container and pipeline, causing some of the resin particles to break. Therefore, a ball mill was used to simulate the mechanical force suffered by the resin during use.

[0047] Specifically, with a measuring cylinder, 15 mL of the shaped resin was accurately measured and added to the exchange column. A peristaltic pump was used to add 2M sodium hydroxide to the exchange column at a flow rate of 10 mL / min for 5 min, to simulate the adverse factors on the sphericity of the D301 type ion exchange resin during the regeneration process. After the residual sodium hydroxide on the surface of the resin was washed clean with deionized water, the resin was transferred to a stainless steel cylinder and 10 porcelain balls were added. Then the stainless steel cylinder with the resin and porcelain balls was rotated on the ball mill at a speed of 120 rpm for 20 min. During this time, the porcelain balls rubbed against the resin particles, and the resin particles also rubbed against the inner wall of the stainless steel cylinder and each other, to simulate the adverse factors of mechanical force suffered by the resin particles during the process of being transported in the water flow in the container. Both of the above two adverse factors can cause some of the spherical resin particles to break and change into irregular particles, reducing the sphericity of the resin.

[0048] ​S5: Measure the sphericity of the resin sample after applying simulated adverse factors; The resin after applying adverse factors was added to the ion exchange resin particle sphericity measuring device, and the camera transmitted 500 images of the resin sample to the computer. The computer determined that 124 of the images were complete spherical particle images and 376 were broken particle images. At the same time, according to the step S1, the image diameter of the 0.500 mm microspheres was 386 pixel units, and the equivalent diameters of the 124 complete spherical particles were calculated respectively d 1~ d 168 ) and the equivalent diameters of the 376 broken particles were calculated respectively d ’ 1~ d ’ 332 ) as shown in Figure 3 .

[0049] Calculate the sphericity of the resin sample after applying simulated adverse factors:

[0050] By comparing the sphericity of the resin particles before and after applying simulated adverse factors, it is concluded that the sphericity of the D301 type ion exchange resin decreases by 25.6%. By the same method, the decrease rate of other resins can be measured, and the strengths of different resins can be compared.

[0051] Example 3 S1: Shape the resin sample to be tested Specifically, about 60 mL of 001x7 type ion exchange resin was placed in the exchange column, and hydrochloric acid solution was added to the exchange column to make the form of the 001x7 type cation exchange resin all in sodium form. At this time, the resin sample form is determined and stable, ensuring that the diameter of each resin particle does not change during the detection process.

[0052] S2: Measure the standard sample The standard particle size microsphere sample with a diameter of 0.500 mm was added to the ion exchange resin particle sphericity measuring device, and the camera transmitted the image of the 0.500 mm standard particle size microsphere sample to the computer. The computer obtained the average diameter of 10 images as 386 pixel units.

[0053] S3: Measure the sphericity of the original resin sample; The 15 mL of the shaped resin was accurately measured by a measuring cylinder and added into the ion exchange resin particle sphericity measuring device. The camera transmitted 500 images of the resin sample to the computer. The computer determined that 490 images were complete spherical particle images and 10 were broken particle images. According to the 0.500 mm microsphere image diameter of 386 pixel units in the S1 step, the equivalent diameters of the 490 complete spherical particles (respectively d 1~ d 490 ) and the 10 broken particles (respectively d ’ 1~ d ’ 10 ) were calculated, as shown in Figure 4 .

[0054] The sphericity of the original resin sample was calculated as follows:

[0055] S4: Simulate the application of adverse factors to the resin sample.

[0056] After the 001x7 type ion exchange resin is used up, it is usually regenerated using hydrochloric acid. The stress generated by chemical reaction after the resin particles contact the hydrochloric acid can cause some resin particles to break. Therefore, the hydrochloric acid solution was used to elute the resin sample to simulate the adverse factors in the resin regeneration process during daily use. At the same time, the resin particles can collide with each other or with the inner wall of the container and pipeline during transmission in the water flow, causing some resin particles to break. Therefore, a ball mill was used to simulate the mechanical force suffered by the resin during use.

[0057] Specifically, 15 mL of the shaped resin was accurately measured by a measuring cylinder and added into the exchange column. A peristaltic pump was used to add 1 M hydrochloric acid into the exchange column at a flow rate of 10 mL / min for 5 min to simulate the adverse factors on the sphericity of the 001x7 type ion exchange resin when it is subjected to stress during the regeneration process. After the residual hydrochloric acid on the surface of the resin was washed clean with deionized water, the resin was transferred into a stainless steel cylinder and six porcelain balls were added. Then the stainless steel cylinder with the resin and porcelain balls was rotated on the ball mill at a speed of 120 rpm for 10 min. During this period, the porcelain balls rubbed the resin particles, and the resin particles also rubbed the inner wall of the stainless steel cylinder and each other, to simulate the adverse factors of mechanical force suffered by the resin particles during transmission in the water flow in the container. Both of the above two adverse factors can cause some spherical resin particles to break and change into irregular particles, reducing the sphericity of the resin.

[0058] S5: Measure the sphericity of the resin sample after the simulated adverse factors are applied; The resin subjected to the adverse factor was added to the ion exchange resin particle sphericity measuring device, and the camera transmitted 500 resin sample images taken to the computer. The computer determined that 298 of the images were complete spherical particle images and 202 were broken particle images. Meanwhile, according to the image diameter of the 0.500 mm microspheres in the S1 step, 386 pixel units, the equivalent diameters of the 298 complete spherical particles (respectively d 1~ d 168 ) and the 202 broken particles (respectively d ’ 1~ d ’ 332 ) were calculated, as shown in Table 1. Figure 5

[0059] The sphericity of the original resin sample was calculated as follows:

[0060] The sphericity of the resin particles before and after the simulated adverse factor was applied was compared, and the sphericity reduction rate of the 001x7 type ion exchange resin was 5.1%. The reduction rates of other resins were measured by the same method, and the strengths of different resins could be compared.

[0061] The above shows and describes the basic principles and main features of the present application and the advantages of the present application. It is obvious to those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and the present application can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be regarded as exemplary and non-limiting in any respect, and the scope of the present application is defined by the appended claims rather than the above description, and it is intended to encompass all changes falling within the meaning and scope of the equivalent elements of the claims. Any reference signs in the claims should not be regarded as limiting the claims to which they relate.

[0062] In addition, it should be understood that although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that those skilled in the art can understand. The above is only to illustrate the technical idea of the present application, and cannot limit the protection scope of the present application. Any modification made on the basis of the technical solutions of the present application falls within the protection scope of the claims of the present application.​

Claims

1. A device for measuring the strength of ion exchange resin, characterized in that, Includes computer, macro camera, magnifying lens group, sample injector, sample cell, background light source, circulation pump and tubing; Standard sample particles of known size are added to the injector. A circulating pump drives the water flow, causing the standard sample particles to circulate in the pipeline with the water flow. When the standard sample particles pass through the sample cell, images are captured by a macro camera. The background light source provides illumination. The images are magnified by the magnifying lens group and then captured by the macro camera. The number of images captured is set according to the experimental needs. Alternatively, a set volume of shaped resin sample can be added to the injector, and a circulating pump can drive water flow, causing the resin to circulate in the pipeline with the water flow. As the resin particles pass through the sample cell, they are continuously photographed by a macro camera. n Images of the resin are captured by a macro camera after being magnified by a magnifying lens group, with the number of images adjustable according to experimental needs. A computer compares the image size of the standard sample with that of each test sample to calculate the equivalent particle size of the shaped resin particles in each image. d i .

2. The apparatus for measuring the strength of an ion exchange resin according to claim 1, characterized in that, Computers can distinguish between images of complete spherical particles and broken non-spherical particles, and count the number of images of spherical particles. n 圆 With the number of broken particles n 碎 The equivalent particle size of each particle was calculated separately.

3. The apparatus for measuring the strength of an ion exchange resin according to claim 1, characterized in that, The volume of intact spherical particles and the volume of broken resin particles are calculated from the equivalent particle size in each image and the number of images, i.e.: 。 4. A method for determining the strength of an ion exchange resin, characterized in that, This method is based on an apparatus for measuring the strength of an ion exchange resin according to any one of claims 1 to 3, comprising: The ion exchange resin sample is shaped to ensure that it is in a defined and stable morphology during measurement; Take a sample of ion exchange resin after setting a certain volume and place it in the ion exchange resin strength measuring device to calculate the sphericity of the ion exchange resin particles. Take the same volume of the fixed ion exchange resin sample and simulate applying various adverse factors to the resin according to the resin's usage environment. The resin subjected to various adverse factors is placed into an ion exchange resin strength measuring device to calculate the sphericity of the ion exchange resin particles. The strength of ion exchange resins is evaluated by measuring the change in the sphericity of the resins before and after applying adverse factors.

5. The method for determining the strength of an ion exchange resin according to claim 4, characterized in that, strength D The definition is: the change in sphericity of an ion exchange resin before and after it is subjected to adverse factors, that is: D = ω 前 - ω 后 。 6. The method for determining the strength of an ion exchange resin according to claim 4, characterized in that, sphericity ω The definition of is: the proportion of the volume of a complete spherical particle to the total volume of the resin, that is: The total resin volume is the sum of the volume of intact spherical particles and the volume of broken resin particles.

7. The method for determining the strength of an ion exchange resin according to claim 4, characterized in that, The simulated adverse factors include: the impact force of water flow on the ion exchange resin particles, the stress generated by soaking in acid and alkali solutions, and the friction and extrusion forces between particles or between particles and the container.

8. The method for determining the strength of an ion exchange resin according to claim 7, characterized in that, Because different types and brands of resin particles have different strengths, when adverse factors are applied, different proportions of the resin particles break, transforming from spherical particles into broken particles.

9. The method for determining the strength of an ion exchange resin according to claim 7, characterized in that, The simulated adverse factors of water flow impact and acid / alkali solution immersion are achieved by adding acid / alkali solutions to the resin located in the exchange column via a pump.

10. The method for determining the strength of an ion exchange resin according to claim 7, characterized in that, The simulated adverse factors of friction and extrusion are achieved by ball milling the resin particles.

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