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沸石

Release date:2018-05-04  source:海外矿投网  Browse times:408
 沸石

沸石-zeolite】

沸石族矿物的总称。包括三十多种含沸石水的钙、钠以及钡、钾的硅酸盐矿物,主要有钠沸石、钙沸石、方沸石、束沸石、菱沸石、片沸石、交沸石等。晶体所属晶系随矿物种的不同而异,以属于单斜和正交(斜方)晶系的占多数。自然界已发现的沸石有36种,沸石的形态随种别的不同而异。如方沸石、菱沸石常呈等轴状晶形,片沸石、辉沸石呈板状,毛沸石、丝光沸石呈针状或纤维状。钙十字沸石和辉沸石的双晶常见。它们含水量的多少随外界温度和湿度的变化而变化,但并不影响其晶体的内部结构。主要形成于低温热液阶段,常见于喷出岩气孔中,也见于热液矿床和近代温泉沉积中。沸石可以借水的渗滤作用,以进行阳离子的交换,其成分中的钠、钙离子可与水溶液中的钾、等离子交换,工业上用以软化硬水。沸石由于结构的多样性,在不同的沸石的晶格中存在着大小不同的空腔,因而可以吸取或过滤大小不同的其他物质的分子。工业上常将其作为分子筛,以净化或分离混合成分的物质,如气体分离、石油净化等。

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【沸石名字的来历】

瑞典的矿物学家克朗斯提(Cronstedt)发现有一类天然硅铝酸盐矿石在灼烧时会产生沸腾现象,因此命名为“沸石”。

Zeolites are microporous, aluminosilicateminerals commonly used as commercial adsorbents and catalysts. The term zeolitewas originally coined in 1756 by Swedish mineralogist Axel Fredrik Cronstedt,who observed that upon rapidly heating the material stilbite, it produced largeamounts of steam from water that had been adsorbed by the material. based onthis, he called the material zeolite, from the Greek ζέω (zéō), meaning "toboil" and λίθος (líthos), meaning "stone".(节选自维基百科)

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