1, the ion exchange of zeolite: 

 Water is a natural zeolite aluminosilicate minerals frame structure, zeolite framework aluminum (Si) tetrahedra and oxygen atoms have not been in some valence and so that the entire aluminum oxide (Si-O) tetrahedron a negative charge, in order to maintain electrical neutrality, the lack of positive charge from the vicinity of the positively charged cations such as k, Na, Ca, Mg and other alkali or alkaline earth metal ions to compensate for balance, the balance of cations and water molecules combined with the framework do not close easily with the surrounding aqueous solution of cation exchange, the exchange after the crystal structure of zeolite is not destroyed, which makes the ion exchange of zeolite. 

 2, the affinity of zeolite 

 There are many size of the zeolite lattice uniform internal cavities and channels, some the size of cavities and channels of zeolite crystals can be accounted for more than 50% of the volume of these holes and channels in the physical and chemical conditions must have a precise and fixed diameter (3 -10A). Variety of zeolites are also different in diameter, smaller than the diameter of the adsorption material can be, and is greater than the diameter of the material were excluded. Zeolite has a large electrostatic attraction, in its rack aluminum silicate lattice cation lattice charge that and balance the negative charge on the cation positive charge center is not overlap in space, so in the cavities of significant electrostatic attraction, which has a dipole moment of the zeolite or molecular quadrupole polarizability of molecular materials and the material has shown a good affinity. 

 3 zeolite adsorption 

 Zeolite has a large specific surface area (up to 500-800 square meters / g) and thus can have a greater dispersion of power, can be used as an excellent adsorbent, diffusion capacity for work mainly by the adsorption process, in most cases, particularly in the low partial pressure range, a large adsorption capacity of zeolite, higher than many other adsorbents, but in the high partial pressure range, the adsorption capacity of zeolite is often very small. 

 In view of its unique molecular structure of zeolite, ion exchange determines that it has and the electrostatic capacity, acid, alkali thermal stability, good performance, is a good adsorbent. Natural zeolite activated by a variety of special techniques, so that more zeolite adsorption, ion exchange properties better and more conducive to removal of various pollutants can be versatile alternative to activated carbon for water treatment depth of new material. 

 According to the performance and characteristics of zeolite is widely used in building materials industry, agriculture, light industry, environmental protection and national defense and other fields. 

 Uses: mainly used for small and medium sized zeolite softened water boiler to remove water calcium and magnesium ions, thereby reducing the formation of boiler scale, reduce the water measuring the corrosion of metals, extend the life of the boiler. Zeolite is a new material by the (SiO2) m derived, due to a number of Si4 + by Al3 + is replaced by the formation of a water porous frame structure of aluminosilicate minerals, zeolite is a kinds of material with good absorption properties, can be used as the adsorption of organic matter in drinking water, sea water provide potassium zeolite (zeolite cavities and channels within a certain physical and chemical conditions, with precise and fixed diameter, smaller than the diameter of the adsorption material can be, and is greater than the diameter of the material were excluded. This phenomenon is called "molecular sieve" effect), removal of NH +4 in the adsorbent. Its heavy metal wastewater Cu (HN3) 2 +4 also has a good adsorption performance of zeolite has good acid and alkali resistance, thermal stability, ion exchange properties and the open framework structure, has a huge cavity surface, per gram within the sample surface area of up to 1100m2, second only to the activated carbon. Dispersion forces and electrostatic adduct determine the adsorption capacity of zeolite particularly strong. Since static electricity, zeolite materials have also preferred polar adsorption. Is widely used in industry, agriculture, national defense and other departments, zeolite is used as ion exchanger, adsorption separation, desiccant, catalyst, cement materials. In the petroleum, chemical industry, for petroleum refining catalytic cracking, hydrogenation and petroleum cracking the chemical isomerization, reforming, alkylation, disproportionation; gas and liquid purification, separation and storage agent; water softening, desalination of sea water agent; special desiccant (dry air, nitrogen, hydrocarbons, etc.). In the light industry for the paper, synthetic rubber, plastics, resins, paints and quality of color filling agent.