How Is Ion Exchange Resin Preserved

Use the following three ways to save, you can achieve the quality of the effect.

Resin pretreatment

Because in the process of synthetic resin, the surface and void of the resin are mixed with low molecular and some inorganic impurities (such as copper, iron, etc.), molecular monomer substances, and pore-causing agents, etc., so before the resin is officially put into operation, these impurities must be removed, otherwise it will pollute the resin in various ways during use. In particular, it should be pointed out that in the wastewater containing chromium, because chromic acid is an oxidizing agent, such as copper and iron in the resin, it has a catalytic oxidation effect, thereby speeding up the oxidation of the resin. The pretreatment method is as follows:

1. Wash in hot water

The new resin to be used is washed repeatedly with hot water. Yang resin can be used in hot water of 70 ~ 80℃, Yin resin (especially strong alkali Yin resin) has poor heat resistance, and can be used in hot water of 50 ~ 60℃. When starting to soak, change the water every 15 minutes or so, if it is not stirred when washing, change the water 4-5 times, you can change the water every 30 minutes or so, a total of 7 to 8 times, soak until the washing water is not brown and the foam is very little.

2. Acid, alkali treatment

The resin is washed in hot water and then filled into the column and treated with acid and alkali. Positive resin with 1mol/1HCL slowly flow through the resin layer, the amount is about 2 to 3 times the volume of the resin, about 2 hours to finish the flow, slightly washed with water, and then with 1mol/1NaOH flow through the resin layer, the amount and flow rate are the same as before. After the alkali flow is finished, the resin is washed with water until the effluent ph9 is about, and then 1mol/1HCL or 0.5mol/1H2SO4 is used to convert the resin into H+ type, the dosage is 3-4 times the volume of the resin, and the flow rate is the same as before. After the acid flow is finished, wash with water until the water is above ph6, you can put into operation.

Resin care

In the process of using the resin, the pollution of suspended matter, organic matter and oil should be prevented, and the violent oxidation of some wastewater on the resin should be prevented. Therefore, heavy metal ions should be removed before the acid oxidation wastewater enters the negative resin to prevent the catalytic effect of heavy metals on the resin. After each operation of the equipment, the waste water in the exchange column should be discharged back to the waste water tank and soaked in tap water or purified water instead. The resin should be regenerated in time after saturation, and should not be soaked in the stock solution for a long time after regeneration, and should be washed in time.