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早先报道说在有一价盐存在的条件下,可采用阳离子浮选的方法分选钠长石(NaAlSi3O8)和钾长石(KAlSi3O8)是可能的。然而,与这一结果相反,一系列的钾长石矿物的可浮性表明,每种微斜长石都显示出不同的可浮性和Zeta电位曲线,这些情况转而又对我们研究小组早先报道的结果提出怀疑。采用化学分析电子能谱法(ESCA)和扫描电镜与X射线色散能谱法(SEM/EDS)分析表明,在微斜长石表面上存在着纳米级尺寸的显微斑点。这些从几个nm到大约1000nm尺寸的纳米级显微斑点,不仅扭曲了长石矿物的表面畸变,而且还控制长石矿物的浮选行为。很有意思的是,这些斑点中还包藏着那些在整体化学分析过程中不能检测出的元素杂质,而且在表面以下20深度处却含有着百分之几的Mn、Cu、Ba、Cr、Fe元素。这些杂质被认为是在颗粒沿着较弱界面选择性碎裂时曝露出来的,并且是按曝露杂质数量而成比例的改变着微斜长石的表面性质。
It has been previously reported that it is possible to sort albite (NaAlSi3O8) and potassium feldspar (KAlSi3O8) by cationic flotation in the presence of monovalent salts. In contrast to this result, however, the flotability of a series of potassium feldspar minerals shows that each of the plagioclase shows a different flotability and Zeta potential curve, which in turn is in the interest of our research team earlier Reported the results raised doubts. The chemical analysis of electron spectroscopy (ESCA) and scanning electron microscopy (SEM) and X-ray dispersive spectroscopy (SEM / EDS) analysis show that there are nano-scale microscopic spots on the surface of the plagioclase. These nano-scale microscopic spots from a few nm to about 1000 nm in size not only distort the surface distortions of feldspar minerals but also control the flotation behavior of feldspar minerals. It is interesting to note that these spots also contain elemental impurities that can not be detected during the overall chemical analysis and contain a few percent of Mn, Cu, Ba, Cr and Fe elements at a depth of 20 degrees below the surface . These impurities are believed to be exposed as the particles selectively fragment along the weaker interface and change the surface properties of the plagioclase in proportion to the amount of exposed impurities.