摘要:
赣南离子吸附型稀土矿是我国重要的稀土资源,本文运用美国ASD FieldSpec-3便携式地物波谱仪,对赣南寻乌稀土矿区稀土精矿粉配置的25个稀土溶液样品进行波谱测试,获取了不同稀土含量的波谱特征,结果表明溶解在水体中的稀土元素在可见光-近红外574 nm、790 nm、736 nm、520 nm、861 nm、443 nm等波段具有多个明显的稀土特征吸收谷及若干次级的稀土特征吸收谷;通过与15种稀土单元素波谱特征对比分析,可见这些吸收特征主要由一种或几种稀土单元素引起;随着稀土浓度的降低,这些吸收特征逐渐减弱甚至消失.这一研究进一步加深了对我国赣南稀土溶液波谱特征的认识,同时为赣南稀土元素的高光谱遥感研究奠定了理论基础.
Abstract:
Ion-absorbed rare earth ores located mainly in southern China are important rare earth resources. However, little research has been conducted on its spectral reflectance characteristics. In this paper, twenty-five aqueous samples containing various amounts of rare earth elements (REE) were made up by the rare earth ore powder of Xunwu in south Jiangxi, and the reflectance spectra were obtained by the measurement of Analytical Spectral Devices (ASD) FieldSpec-3 spectroradiometer. Peaks at 574 nm, 790 nm, 736 nm, 520 nm, 861 nm, 443 nm and several subordinate absorption peaks at 470 nm, 484 nm, 512 nm, 627 nm, 675 nm, 732 nm, 800 nm caused by REE in visible and near-infrared bands were detected. Through the comparison of spectral characteristics of fifteen REE single elements, it is shown that the absorption bands correspond to one or several REE elements. In addition, the absorption intensities become weaker and weaker with the decease of the concentration of REE in the twenty-five samples. These absorption features hence can be applied as a factor to estimate the concentrations of REE. The studies have enhanced our understanding of reflectance characteristics of ion-absorbed REE in southern China and strengthened the theoretical basis for hyperspectral study of this kind of REE ores.
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