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Solid-state nuclear magnetic resonance and infrared spectroscopy of alkali feldspars

Science China Earth Sciences 1997年第2期40卷 159-165页

作者：周玲棣郭九皋杨年华李丽云 Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou 510640 China Laboratory of Magnetic Resonance and Atom and Molecular Physics Wuhan Institute of Physics Chinese Academy of Sciences Wuhan 430071 China

^(29)Si, ^(27)Al MAS NMR and IR spectra of monophase K-feldspars (sanidine, orthoclase and micro-cline) and na-feldspars (monalbite, anorthoclase and low albite) in different structural states have been studied. The NMR and IR spectra of K-feldspars and na-feldspars vary regularly along with their degrees of Si/Al ordering evolution. Si in orthoclase occupies T2m, T2o and T1m, and the high-temperature na-feldspar (monalbite and anorthoclase) coincides in 29Si, 27Al NMR and IR spectra. Moreover, all the high-temperature na-feldspars and sanidine have the same 27Al NMR and IR spectra.

关键词： K-feldspar na-feldspar NMR IR ordering

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Differential Flotation of Some Egyptian feldspars for Separation of Both Silica and Iron Oxides Contaminants

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Journal of Minerals and Materials Characterization and Engineering 2015年第6期3卷 435-443页

作者： Tawfik Refaat Boulos Suzan Sami Ibrahim Ahmed Yehia Central Metallurgical Research & Development Institute (CMRDI) Cairo Egypt

An anionic-cationic flotation of two Egyptian feldspar samples, representing Road Ashaab locality of the Eastern Desert of Egypt, was investigated on both laboratory and pilot plant scales. The pegmatites belong to the alkali feldspar granite type, mostly microcline and orthoclase, KAL Si3O8 coarse grained rocks. Quartz, as the main gangue mineral, occurs in two forms as either free grains or as veins intercalating the feldspar crystals or, sometimes, intermingled with them. Iron, on the other hand, is found in three different forms as free magnetite embedded in the feldspar crystals, as microcrystalline crystals, or as magnetite filling cracks in the feldspar. Dissolution of magnetite to hematite is, sometimes, observed. Grinding of the feldspar samples to less than 0.25 mm followed by desliming was optimized in the laboratory, using a ball mill in closed circuit with the screen. Anionic flotation of the iron oxide impurity from the -0.25 + 0.03 mm ground product was successfully conducted using locally produced dodecyl benzene sulphonic acid—rice bran oil/kerosene promoter at pH 3. Cationic flotation of feldspar from this product was then carried out employing a locally produced quaternary ammonium salt in presence of HF acid, as a silica depressant and a feldspar activator at pH 3. feldspar final concentrates assaying 80.8% - 89.5% feldspar mineral, 0.119% - 0.127% Fe2O3 and 16.84% - 18.65% Al2O3, were obtained at the optimum operating conditions that satisfy the requirements of the ceramic industry. Continuous 200 kg/h pilot plant runs were conducted using the appropriate equipment, based upon the laboratory findings to produce feldspar concentrates assaying 16.38% - 18.13% Al2O3, and 0.13% - 0.15% Fe2O3. Materials’ metallurgical balance and complete chemical analyses were shown.

关键词： na-feldspar K-feldspar Flotation Sand Separation Effect of pH

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