Abstract:

Electron microprobe analysis (EMPA) and X-ray diffraction (XRD) were used to study the chemical and structural differences of a series of natural tourmaline crystals including six species respectively from Xinjiang (XJF, XJ and XJZ), Yunnan (YN), Guangxi (GX) and Brazil (BXL). The results indicated that the species XJ, YN and GX are schorl, XJZ is dravite, XJF is elbaite, and BXL is tsilaisit. The FeO contents of the three species XJ, YN and GX are in an order of XJXJ>XJZ>BXL>YN>GX. The result may be caused by polyhedron distortions of YO₆ octahedron. It can be concluded that the ability of formaldehyde purification will increase along with the increased mesh number.

Key words: tourmaline, isomorphism, formaldehyde purification

摘要：

利用电子探针和X射线衍射仪, 分析来自新疆(XJ, XJZ, XJF)、云南(YN)、广西(GX)和巴西(BXL)4个产地的6种电气石样品的成分及结构差异, 并研究种类不同、粒度相同的电气石以及种类相同、粒度不同的电气石对甲醛的净化能力。电子探针结果表明, XJ, YN和GX属铁电气石类, 其铁含量依次增加, XJZ为镁电气石, XJF为锂电气石, BXL为钠锰电气石。X射线衍射结果表明, 铁的存在使电气石的晶胞参数变大。实验证实, 当粒度相同时, 不同种类电气石净化甲醛的效果存在较大差异, 属锂电气石的XJF最优, 铁含量最高的GX最次, 6种样品净化甲醛的能力大小为XJF>XJ>XJZ>BXL>YN>GX, 推测与Y八面体的离子占位不同引发的多面体扭曲程度有关; 种类相同的电气石粒度越小, 电学性能越好, 净化甲醛的效率越高。

关键词: 电气石, 类质同像, 净化甲醛