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地开石在陶瓷、涂料、化妆品及填料的工业应用中有着广泛潜力。在本研究中,挑选紫金山Au-Cu矿床中三种典型的地开石(透明、半透明和不透明)和一种矿区分布广泛的淋滤型地开石,通过电子探针(EPMA),X射线粉末衍射(XRD)、傅立叶红外光谱(FT-IR)和场发射扫描电子显微镜(FESEM)表征矿物学特征。EPMA成分对比分析表明,地开石纯度均较高,Al2O3和Si O2质量分数低,Fe O质量分数低,白度很高,可以有效地应用到造纸工业中。XRD和FT-IR结果表明,不透明地开石结晶较好,有序度较高,随着透明度的增加,透明地开石的有序度降低,结晶较差。FESEM分析表明,不透明的地开石晶粒发育较好,片层之间堆积紧密,晶粒横向最大尺寸为5μm,随着透明度的增加,晶粒横向尺寸减小,透明地开石的晶粒为0.2~1μm;淋滤型地开石可见假六方状片层相互堆积,但由于酸性淋滤作用,片层上有很多小空洞,且片层的边缘溶解,堆积松散,这种淋滤地开石的间层有利于其他高分子材料插入,可用于制备地开石-高分子复合材料。此外,对紫金山Au-Cu矿床地开石的矿物学特征的研究,弄清了地开石之间的形成关系,以及与矿区的成矿关系。
Dickite has broad potential in industrial applications of ceramics, coatings, cosmetics and fillers. In this study, three typical dickite (transparent, translucent and opaque) and a widely distributed leached dickite in the Au-Cu deposit of the Zijin Mountain were selected and characterized by electron microprobe (EPMA) X-ray powder diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR) and field emission scanning electron microscopy (FESEM) were used to characterize the mineralogical characteristics. The comparative analysis of EPMA shows that the purity of dickite is high, the mass fraction of Al2O3 and Si O2 is low, the mass fraction of Fe O is low and the whiteness is very high, which can be effectively applied to the paper industry. The results of XRD and FT-IR show that the opaque kaolinite has a better crystallinity and a higher degree of order. As the opacity increases, the degree of crystallinity of the kaolinite decreases and the crystallization is poor. FESEM analysis shows that the opaque dickite grains develop well and the plies have close packing. The maximum grain size in transverse direction is 5μm. With the increase of transparency, the grain size decreases, Is 0.2 ~ 1μm; leaching type to open the stone can be seen fake hexagonal sheets stacked with each other, but due to acidic leaching, there are many small holes on the sheet, and the edge of the sheet dissolved, loose accumulation, this leaching Intercalation of open stone is conducive to the insertion of other polymer materials can be used to prepare the open stone - polymer composite materials. In addition, the study on the mineralogical characteristics of the dickite in the Au-Cu deposit in Zijin Mountain clarifies the relationship between the dickite and the ore-forming relationship with the ore district.