水热法合成黄铁矿微观形貌和结构的观测与表征-论文.pdf

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1、第2O卷第3期地学前缘(中国地质大学(北京)；北京大学)Vol_2ONO．32013年5月EarthScienceFrontiers(ChinaUniversityofGeosciences(Being)；PekingUniversity)May2013水热法合成黄铁矿微观形貌和结构的观测与表征宋丹，刘佳，黄菲，李光禄，孟林，陈应华，俞浩然，高尚，高文元东北大学，辽宁沈阳110819SONGDan，LIUJia，HUANGFei，LIGuanglu，MENGLin，CHENYinghua，YUHaoran，GAOShang，G

2、AOWenyuanNortheasternUniversity，Shenyangli0819，ChinaSONGDan，LIUJia，HUANGFei，eta1．Observationandcharacterizationofmicromorphoiogyandmicrostruetureofpyritesynthesizedbyhydrothermalmethod．EarthScienceFrontiers，2013，20(3)：118—122Abstract：Bysimulatingthegeologicalconditi

3、onsofformingpyriteinhydrothermalgolddeposits，usingFeS()4andCH3CSNH2asrawmaterials，andkeepingtheratioofFe／Sat1：3，thepowdercrystalsofpyrite(FeS2)werepreparedbyheatingfor24hoursinacertaintemperaturebetween180—200℃．Themorphologyandcomponentsofthepyritecrystalssynthesize

4、dbydifferenthydrothermalconditionswereobservedbyscanningelectronmicroscopy．ThephasecompositionofexperimentalproductwasdeterminedbyXRD．Themorpholo～gyandmicro-structureofthepyritegrainsweresystematicallyobservedbyusingtransmissionelectronmicro—scope．Theresultsindicate

5、dthatat200℃，thepyritewasrelativelyuniformgranularwiththeparticlesizeabout1／am；atthetemperatureof180℃，besidesthegranularpyritewithsizeof1／amsynthesized，therewerealsoirregularbandingpyritecrystalswiththebandwidthof200nm．Withthegradualincreaseincrystal～lizationtemperat

6、ure，thecrystalmorphologychangedgraduallyfromirregularlyshapedcrystaltoregularshapecrysta1．Inhighexperimentaltemperature，therewouldbethegranularmorphology，whereasinlowtempera—ture，irregularribbonmorphologywouldappear．Keywords：hydrothermal；pyrite；morphologyandstructur

7、e；observationandcharacterizati0n摘要：模拟热液型金矿床中黄铁矿生成的地质条件，采用硫酸亚铁(FeSO)和硫代乙酰胺(CH。CSNH)为铁源和硫源，在Fe／S比为l：3、温度180～200℃、加热时间24h条件下考察黄铁矿的结晶情况。用SEM扫描电镜观察在不同水热条件下合成黄铁矿的形态及成分；用多晶X射线衍射仪(XRD)确定了产物物相组成；用透射电子显微镜(TEM)观测表征了黄铁矿晶体的形态和结构。结果表明：在200℃时黄铁矿为粒状，粒度较均匀，粒径l／am左右。在180℃时黄铁矿除有尺寸在1／a

8、m左右粒状黄铁矿外，还有不规则带状黄铁矿晶体，带宽为200nin左右。认为水热条件中，随着结晶温度的逐步升高，黄铁矿的形貌逐步由不规则形状向规则形状的转变。所以在实验温度较高阶段，形成规则的粒状形貌；在低温阶段，则会出现不规则带状形貌。关键词：水热法；黄铁矿；形貌和结构；观测