Explanation

It is a substance that can exchange with cations or anions in a solution. The ion exchanger is generally composed of a macromolecule charged group and a replaceable ion. The ions in the solution with the same charge as the replaceable ion react with the replaceable ion charge, and are adsorbed on the macromolecule charged group of the ion exchanger by electrostatic attraction to replace the replaceable ions on the ion exchanger. ion exchanger can be divided into cation exchanger and anion exchanger according to the charge of exchangeable ions. The exchangeable ions on the cation exchanger are positively charged and can exchange and adsorb cationic pollutants in the solution; The exchangeable ions on the anion exchanger are negatively charged and can exchange and adsorb anionic pollutants in the solution. According to different parent materials, ion exchanger can be divided into inorganic ion exchanger and organic ion exchanger (see organic ion exchange resin). inorganic ion exchanger include natural or artificial aluminosilicates, multivalent metal acid salts, heteropoly acid salts, metal hydrated oxides, etc. Organic ion exchanger include sulfonated coal and various ion exchange resin. With the help of ion exchange reaction on ion exchanger, harmful ions in water can be removed, precious metals ions can be recovered, and it can also be used for the treatment of radioactive wastewater and organic wastewater. After being used for a long time, ion exchanger will lose the ability to continue to exchange ions in water. Regenerant solution with a certain concentration can be used to pass through the failed exchanger layer in downstream flow or negative flow to regenerate and restore the exchanger into prototype.

Classification