Why pretreatment of resins?
Pretreatment method of new resin1. Remove the resin by manual extraction of the cation exchanger that needs to be replaced.2. The maintenance personnel will check the inside of the exchanger, and deal with the abnormal situation detected.3. After the exchanger has returned to its normal working condition, the new resin will be handled and loaded into the exchanger according to the required quantity,
The new resin must be pretreated before it is sent to the exchanger. This is because a small amount of no low polymer polymerization good and did not participate in the polymerization reaction substance containing the new resin, when the resin with water, acid, alkali or other contact solution, the material will be transferred to the influence of water quality in the solution, in addition to the organic matter, may also contain iron, copper and lead. Inorganic impurities, so the new resin should be pretreated before use to remove soluble impurities in resin. At the same time, pretreatment can not only improve the stability of resin, but also play a role in activating resin and improving its exchange capacity.
A resin is loaded into a container, the container for backwashing resin with small flow operation, to remove residual impurities mixed material and manufacturing process of the reaction did not participate in the resin production process in the backwashing drainage to clear.B, soak the resin with 5% HCI solution for 4 hours, then rinse the water to neutral. The purpose of acid treatment is to remove inorganic impurities in the resin.C, take temporary take over method, the Yang bed pretreatment into the alkali pipe connection, with 2% NaOH solution soak resin for 4 hours, release the lye, wash the resin to the drainage, close to neutral. The alkali treatment is mainly to get rid of the organic matter in the resin.D, after the above treatment, the original regeneration system will be recovered, and the normal regeneration of the bed should be carried out by the large backwashing and regeneration dose, and then it can be put into operation.Precautions for pretreatment:A and new resin should be prevented from dehydration before pretreatment, or they can not be treated directly. The new resin without normal dehydration can be washed directly with water until the water is colorless and hardness free.B, the volume of soaking liquid generally take 2 times the volume of resin, in order to fully soak the resin.C, for a small amount of resin replacement, can be carried out in the external anti-corrosion containers, should avoid the pretreatment of new resin directly filled in the exchanger.D, for the new resin pretreatment of the exchanger, before regeneration must be large backwash, and large backwash before should be small backwash.
