CETEM-Centre for Mineral Technology, Division for Technological Characterisation, Rio de Janeiro, RJ, Brazil.
Spectrochim Acta A Mol Biomol Spectrosc. 2011 Oct;80(1):102-5. doi: 10.1016/j.saa.2011.03.001. Epub 2011 Mar 9.
In this investigation, Raman spectroscopy with 1064 and 632.8 nm excitation was used to investigate real mineral samples of bauxite ore from mines of Northern Brazil, together with Raman mapping and X-rays diffraction. The obtained results show clearly that the use of microRaman spectroscopy is a powerful tool for the identification of all the minerals usually found in bauxites: gibbsite, kaolinite, goethite, hematite, anatase and quartz. Bulk samples can also be analysed, and FT-Raman is more adequate due to better signal-to-noise ratio and representativity, although not efficient for kaolinite. The identification of fingerprinting vibrations for all the minerals allows the acquisition of Raman-based chemical maps, potentially powerful tools for process mineralogy applied to bauxite ores.
在这项研究中，我们使用 1064nm 和 632.8nm 激发的拉曼光谱法对来自巴西北部矿区的真实铝土矿矿石样品进行了研究，同时还进行了拉曼映射和 X 射线衍射分析。得到的结果清楚地表明，微拉曼光谱法是识别铝土矿中通常存在的所有矿物的有力工具：三水铝石、高岭石、针铁矿、赤铁矿、锐钛矿和石英。还可以对块状样品进行分析，由于具有更好的信噪比和代表性，因此 FT-Raman 更合适，尽管对高岭石的效果不佳。对所有矿物的指纹振动进行识别，可以获得基于拉曼的化学图谱，这是一种非常强大的应用于铝土矿的过程矿物学工具。
