overview
Anion and cation exchangers are highly purified equipment for natural water, such as river water, lake water, and deep well water. These types of water contain a large amount of calcium, magnesium, sodium, and salts, with a content of less than 500 mg/L. Through anion and cation exchange purification, their content can be reduced to 5-10 mg/L or less, which is equivalent to a conductivity of about 10 μ m/cm for water. They can be used as industrial water for radio, medicine, papermaking, chemical, atomic energy, etc; If higher purity is required, further purification can be achieved through a mixed cation exchanger.

Basic structure
Salts such as Ca (HCO) contained in raw water₃)₂, MgSO₄, NaCl, Na₂SiO₃When calcium, magnesium, and sodium salts flow through the cation exchange resin layer of the cation exchanger, the cation Ca²⁺, Mg²⁺, Na+is replaced by hydrogen ions in the active groups of the resin, generating H₂CO₃, H₂SO₄, HCL,H₂SiO_3；When passing through the anion exchange resin layer of the anion exchanger, the anion HCO₃-, SO₄^2-, CL-,HSiO₃-Replaced by hydroxide ions in the resin's functional groups, generating H₂O, The water is purified. If the bicarbonate content in the raw water is high, a degassing tower should be installed between the cation and anion exchangers to remove CO₂Gas.

Raw water contains Ca (HCO)₃)₂, MgSO₄, CaSO₄, MgSO₄, CaCL₂, NaCl,Na₂SiO₃After the ion exchanger has been working for a period of time, the exchange capacity of the resin; When the cation and anion salts in the raw water are saturated, the water quality at the outlet of the ion exchanger changes significantly. At this time, the ion exchanger should stop working and undergo regeneration treatment to restore the exchange capacity of the resin. The cation resin can be regenerated with hydrochloric acid (or sulfuric acid), and the anion resin can be regenerated with caustic soda.

Technical Parameter