Zeolite 
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 【Overview】 
 Zeolite general chemical type as: AmBpO2p? NH2O was, structure type A, (x / q) [(AlO2) the x (of SiO2) y-] n-(H2O) of which: A, as of Ca and of Na K, of Ba of Sr and other cations, B, Al and Si, p is the cation valence, m is the cation number n is the number of water molecules, x is the Al atomic number, y number of Si atoms, (y / x) is usually in the range of 1 to 5 (x + y ) is the number of tetrahedra in the unit cell. 
 Nature has been found that the zeolite more than 30 kinds, more common well-zeolite, chabazite, calcium zeolite, on-chip zeolite, sodium zeolite, mordenite, stilbite, etc., are calcium, sodium based. How many of them water content changes with the outside temperature and humidity changes. The crystal belongs to the crystal varies with the different mineral species, the majority of monoclinic and orthorhombic crystal system (orthorhombic). Analcime, chabazite often has equiaxed shape, the piece zeolite, stilbite was tabular, acicular or fibrous erionite, mordenite, the calcium Cross zeolite and pyroxene boiling Dan Shuangjing common. A variety of pure zeolite are colorless or white, but mixed with impurities was a variety of light-colored. Glass luster. Cleavage varies with the crystal structure. Mohs hardness is moderate. The proportion ranged from 2.0 to 2.3 up to 2.5 to 2.8 with barium. Zeolite is formed in the low-temperature hydrothermal stage, common in the spray in the rock pores, also found in hydrothermal deposits and modern hot spring deposits. Zeolite can be by percolation of water to the cation exchange of sodium in its composition, the calcium ion exchange with potassium, magnesium and other ions in aqueous solution, the industry used to soften hard water. The zeolite crystal structure of silicon (aluminum)-oxygen tetrahedron with a three-dimensional framework, there are a variety of different sized holes and channels in the frame, with great openness. Alkali metal or alkaline earth metal ions and water molecules are located in the holes and channels, and the frame of the link is weak. Different ion exchange has little effect on the zeolite structure, but change the nature of the zeolite. Different cavities of the lattice size, can absorb or filter the different sizes of the molecules of other substances. Industry, often as molecular sieves, purification or separation of the mixed composition of substances, such as gas separation, oil purification, treatment of industrial pollution. 

 There are 36 kinds are many, have been found. Their common feature is a frame structure, that is, in their crystal molecules like put on airs wildly together, the middle of the formation of cavities. Because there are still a lot of water molecules in these cavities, so they are hydrous minerals. These will be discharged when the water in the face of high temperature, such as a flame to burn most of the zeolite will be expansion foam, such as boiling in general. The zeolite of the name is from. Different zeolites have different forms, such as analcime and chabazite general axis-like crystals, tablets zeolite stilbite was plate, the Mordenite became acicular or fibrous, and so on. A variety of zeolite internal pure, they should be colorless or white, internal mixing of other impurities, it will show a variety of shallow color. The zeolite also has a glass-like sheen. We know that the zeolite in the water can run out, but that does not disrupt the crystal structure of the zeolite within. Therefore, it can re-absorb water or other liquids. Thus, it would also become a feature of zeolite. We can some of the substances in the zeolite to separate the oil refining, can make it so that the air becomes dry, you can let it absorb some pollutants, purification and drying alcohol. The zeolite minerals are very widely distributed. Particularly prevalent in the sedimentary rock formed by the pyroclastic. Also found in the soil. 
 [Findings 
 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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