This paper analyzes the reasons of inductive ion exchange resin and broken

Ion exchanger is the commonly used equipment, pure water equipment engineering in total operation, we often meet the ion exchange resin, because resin is expensive, so we have to prevent breakage, reduce the loss.

the current chemical desalination using ion exchange resin, its sphere particles are complete, yellowish. In use process, a small amount of resin occurred due to wear and increases of breakage phenomenon is normal. These broken resin in the resin layer deposition can lead to the increase of flow resistance, affect the normal operation of the equipment. Therefore, we should in ion exchanger backwashing process will remove them. Under normal circumstances, the resin in attrition rate as shown in table 1, when the resin particle breakage rate and loss rate significantly more than normal, the resin can be thought of breakage problem happened. I company engineers through many years of accumulation analysis, summed up the following resin particle breaking reason, hope to be of help:

1. Manufacturing quality is poor. Resin in the process of manufacturing, due to the process parameters to maintain undeserved, can cause partial or blastomere or broken phenomenon, of resin particles was characterized by resin particles after crushing strength is low and the grinding ball rate is low.

　　2. The freeze. Resin particles contains a large number of moisture, temperature is below zero storage or transportation, the water freezes, volume expansion, resin particles caused by split. Frozen visible under the microscope a large number of cracks, the resin after use in the short term will appear serious breakage phenomenon. In order to prevent resin seas, resin should be stored in the 5 - Transportation under 40 ℃, avoid the freeze.

　　3. Dry. Resin particles exposed to air, will gradually lose its internal moisture, resin particles contractive decrescent. Dry resin dip in the water, it can quickly absorb moisture and particle size of swell, causing resin blastomere and broken. Therefore, in the process of storage and transportation of the resin to keep seal, prevent dry. Resin for has dried, it should be immersed in saturated salt water, using a high concentration of ions in the solution, the expansion of the inhibition of resin particles, and then gradually diluted, in order to reduce the blastomere resin and broken.

　　4. The influence of osmotic pressure. Under the normal operation of the resin, in the process of failure, the resin particles can produce the internal stress of expansion and contraction. Resin in the course of long-term use, repeated expansion and contraction, is the main cause of resin particles crack or broken. The speed of expansion and contraction of resin depends on the speed of resin transformation, and transformation of the speed depends on the salt concentration and velocity of water. Gel type resin is used as natural water chemistry in addition to salt, the highest velocity is generally not more than 40 m/h, as water desalination, the maximum velocity is generally not more than 60 m/h. Macroreticular resin for skeletal structure is firm, porosity is larger, can bear larger transition speed, water flow rate can be as high as 100 m/h.

ion exchange resin in attrition rate

resin said attrition rate ( %）

fixed bed 001 x 7 < 5

fixed bed 201 x 7 < 10

moving bed < 10 - More than 15

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