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兰西锰矿和黑锌锰矿是2种较少报道的层状锰氧化物,在河北相广锰银矿床中也未曾被系统描述。本文利用光学显微镜、扫描电镜、电子探针、激光剥蚀电感耦合等离子体质谱、X射线粉晶衍射、透射电镜和拉曼光谱方法对兰西锰矿和黑锌锰矿的形貌特征、化学成分、结构特征进行了研究,结果表明二者均具有纳米到微米级的针、棒、片状等晶形,晶体结构均属于六方晶系,具有沿c轴方向的层状结构。层间阳离子易被Mn2+、Mg2+、K+、Na+、Ag+等离子替代,并含有一层水分子容易在电子束的轰击下失去,使得层间距从0.69~0.75 nm塌陷至0.53 nm左右。黑锌锰矿的拉曼特征峰在波数606、651、163 cm-1处,兰西锰矿的特征拉曼谱峰主要在645 cm-1附近。银在黑锌锰矿比兰西锰矿更为富集,说明了风化作用中锰矿物特殊的层状或孔道结构对于银的富集起着重要的影响。
Lansiite and kyanite are two less commonly reported layered manganese oxides, which have not been systematically described in Xiangguangan silver deposit in Hebei Province. In this paper, the morphological characteristics, chemical composition and structure of Lansi manganese ore and black zinc manganese ore were studied by using optical microscope, scanning electron microscope, electron probe, laser ablation inductively coupled plasma mass spectrometry, X-ray powder diffraction, transmission electron microscopy and Raman spectroscopy. The results show that both of them have crystal form of needle, rod and flake from nanometer to micrometer. The crystal structure belongs to the hexagonal system and has a layered structure along c axis. The interlayer cations are easily replaced by Mn2 +, Mg2 +, K +, Na +, Ag + ions and contain a layer of water molecules which are easily lost by the electron beam bombardment, resulting in the interlayer spacing falling from 0.69-0.75 nm to 0.53 nm. The Raman peak of kyanite is located at the wave numbers of 606, 651 and 163 cm-1, and the characteristic Raman peak of Lanshanite is mainly near 645 cm-1. Silver is more abundant in black kyanite than Lanxi manganese ore, indicating that the particular stratiform or pore structure of manganese minerals during weathering plays an important role in the enrichment of silver.