Zeolite 

 Was first discovered in 1756. Swedish mineralogist Krone Christie (Cronstedt) found a natural aluminosilicate minerals to produce when burning the boiling phenomenon, hence the name "zeolite" (Sweden Wen zeolit), in Greek, Italian for "boiling." (zeo) "stone" (lithos). Since then, the deepening of the zeolite. 
 In 1932, McBain put forward the concept of "molecular sieves". Substances in porous materials at the molecular level on the screening. Although only molecular sieve zeolite a zeolite in the most representative, "zeolite" and "molecular sieve" that the two words are often mixed. Artificial zeolite: sulfonated polystyrene; natural zeolites: aluminum sodium silicate. 
 [Use] 
 Adsorbent and desiccant 
 Catalyst 
 Detergent 
 Other uses (sewage treatment, soil amendment, feed additive) 
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 The main physical and chemical properties as follows: 
 An ion exchange: 
 Zeolite channels and cavities with a variety of alkali metals and alkaline earth metal ions in the moist state, sorted NH4 +, K +, Fe + +, Zn +, Na +, Mg + +, Cu + +, Ca + + and other variety of cations carried out ion exchange, zeolite ion exchange capacity of the size of the common suction ammonia said. Clinoptilolite absorption of ammonia was 43.3 to 82.65%, per gram of zeolite ammonia absorption amount of up to 15.2mg. 
 2, water absorption: 
 Zeolite has good water absorption, adsorption of water can be reused, both absorption saved, but also the release of the use, enjoy the reputation of "solid reservoir". 
 3, specific surface area: 
 Widely distributed in the zeolite channels and cavities, can account for 40 to 50 percent of the overall, both for gas exchange, but also liquid exchange clinoptilolite within the surface area of ??up to 1000 ~ 1100m2 / g, after activated carbon. 
 4, the adsorption capacity: 
 Because zeolite has a larger porosity and large surface area, is a good adsorption properties of substances able to absorb the excess of harmful gases, toxic substances, pesticide residues and heavy metal ions can be used as drinking water adsorption heavy metals and organic compounds, water extracting potassium zeolite (zeolite internal cavities and channels, the physical and chemical conditions, precise and fixed diameter, the material can be less than the diameter of the adsorption, larger than the diameter of substances were excluded. a phenomenon known as "molecular sieves" role), removal of NH4 + adsorbent. Its heavy metal wastewater, Cu (HN3) 2 also has a good adsorption properties, the dispersion force and electrostatic adduct determine the adsorption capacity of the zeolite is particularly strong, due to static electricity, the zeolite is also preferred polar substances adsorption. 
 Zeolite above special structure and physical and chemical properties, is widely used in industry, agriculture, medicine, defense and other departments to be used as ion exchangers, adsorption and separation agents, desiccants, catalysts, molecular sieves, chemical additives, cement, materials. In the petroleum, chemical industry, used as the catalytic cracking of petroleum refining, chemical isomerization, hydrogenation cracking and petroleum reforming, alkylation, disproportionation; gas and liquid purification, separation and storage agent; water softening, seawater dilute the special agent; air, nitrogen, and hydrocarbons desiccant. Can be used for paper, synthetic rubber, plastics, resins, coatings, fillings and quality of color such as light industry. Be used as a soil improvement in the areas of agriculture, animal husbandry, environmental protection, animal husbandry, bio-fermentation, and environmental protection. 
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