Suitable for super purification treatment of natural water (river water, lake river, groundwater, etc.), cationic·anion exchanger has been widely applied in many engineering fields including medical, chemical, electronic, coating, beverage and medium and high pressure boiler water supply industry. It can not only be used for pretreatment of water supply of boiler, heat power station, chemical, light industry, textile, medicine, biological, atomic energy and purified water treatment and situations where industrial production requires water softening and preparation of deionized water, but also can be applied to declorization and purification of foods and drugs, recycle of precious metals and chemical materials, treatment of electroplating waste water, etc.
Analysis of technical principle
When water flows through the cation exchanger, cations will exchange with cation resin to release H+, and strongly acidic cation resins absorb various cations in the following sequence: Fe3+＞Al3+＞Ca2+＞Mg2+＞Na+＞H+; from this we can see that it is most difficult to absorb metal ion Na+ , so various ions absorption layers of resin layer during ion exchange will move down gradually. As H+ is exchanged by other ions finally, Na+ in the lowest layer will be leaked first when the protection layer is permeated; therefore, leakage of sodium is the standard to judge the failure of cation exchanger. The effluent water quality of cation exchanger: Sodium (Na+) ≤100μg/L.
When water flows through the anion exchanger, anions will exchange with anion resin to release OH- and alkalic anion resin absorbs various anions in the following sequence: SO42-＞NO3-＞Cl-＞HCO3-＞HSiO3-＞. This shows HSiO3- has poor absorption ability, so various ion absorption layers of resin layer during ion exchange will move down gradually and OH- is exchanged by other anions. In this case, when the protection layer is permeated, HSiO3- of the lowest layer will be the first to leak; therefore, leakage of sodium is the standard to judge the failure of anion exchanger. The effluent water quality of anion exchanger: silicon (SiO2)≤50μg/L and the electrical conductivity (DD)≤50μS/cm.
When water flows through the mixed-ion exchanger, ion exchange reactions occur almost at the same time inside the mixed-ion exchanger because anion and cation resins are uniformly mixed. That is to say cation exchange and anion exchange are alternately conducted by several times so that hydrogen ions and hydroxyl ions can’t be accumulated. Exchange reactions will not be disturbed by counter ions and can be conducted thoroughly. In this way, the water quality is better. The effluent water quality of mixed-ion exchanger: Na+≤15μg/L, SiO2≤20μg/, electrical conductivity (DD)≤0.2μS/cm.
Equipped with mixed-ion exchanger and reserve osmosis device, purified water preparation system can also be formed.
Besides, the company also manufactures supporting filter, decarbonator, acid-base measuring box, acid-base storage tank and other auxiliary equipment.