Effect of Granularity on the Characteristic Visible-Near Infrared Spectra of Karst-Type Bauxite
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摘要:
岩矿反射光谱是智能矿山岩矿智能感知技术以及遥感信息识别的重要参考依据，由于地物表面粗糙度对反射光谱的影响取决于粗糙高度值与波长关系对电磁波传播的影响，因此颗粒度是影响岩石和矿物反射光谱特征的重要因素之一。喀斯特型铝土矿在中国分布广泛，目前有关铝土矿的反射光谱基础数据还非常匮乏。为了探究颗粒度对喀斯特型铝土矿反射光谱的影响规律，本文选取贵州省修文县小山坝喀斯特型铝土矿为研究对象，采用地物光谱仪测试不同颗粒度铝土矿(铝土岩)样品的可见光-近红外反射光谱，并结合铝土矿(铝土岩)主量元素和矿物组成分析讨论铝土矿与铝土岩的光谱差异。结果表明：小山坝铝土矿(铝土岩)由于矿物组成的不同而呈现显著不同的光谱特征，其中铝土矿的反射光谱特征主要与一水硬铝石一致，在1400nm和1800nm波长处有明显的波谷特征，由OH振动谱带所致；铝土岩的反射光谱特征主要与高岭石一致，在1400nm、1900nm、2160nm和2200nm波长处有显著的波谷特征，分别由OH倍频合频、H2O的振动谱带以及Al-OH基团拉伸和弯曲振动的合频所致，且在2160～2200nm波段呈双吸收峰特征。此外，不同颗粒度铝土矿(铝土岩)的整体反射率均较高，最高超过28%，且变化趋势基本相同。随着颗粒度从＜0.04mm增加到3mm，铝土矿和铝土岩的反射率均逐渐减小，且铝土矿特征波谷的整体吸收强度相对稳定，而铝土岩特征波谷的吸收强度呈逐渐增大的趋势。本文研究认为可采用小颗粒度的粉末样品在1800nm、1900nm、2160nm和2200nm波长处的特征光谱进行铝土矿和铝土岩的区分。
Abstract:The reflection spectrum of rocks and minerals is an important reference for intelligent perception technology and remote sensing information recognition in intelligent mining. Particle size is one of the important factors affecting the reflection spectral characteristics of rocks and minerals. In order to reveal the reflection spectral characteristics of karst type bauxite with different particle sizes, the influence of particle size on the visible and near-infrared spectra of karst type bauxite is elucidated. In the study, the visible light near-infrared reflectance spectra of bauxite (bauxite-bearing rock) samples with different particle sizes were measured using the ASD FieldSpec-4 spectrophotometer. Bauxite and bauxite-bearing rock can be distinguished by characteristic spectra of small particle powder samples at wavelengths of 1800nm, 1900nm, 2160nm, and 2200nm. The research results indicate that as the particle size decreases, the spectral reflectance gradually increases. The BRIEF REPORT is available for this paper at
http://www.ykcs.ac.cn/en/article/doi/10.15898/j.ykcs.202308090133 . -
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表 1 X射线荧光光谱分析小山坝铝土矿(铝土岩)主量元素含量测定结果
Table 1. Major element content of Xiaoshanba bauxite (bauxite-bearing rock) determined by XRF
主量元素 各样品主量元素含量(%) XSB-1 XSB-2 XSB-3 XSB-4 XSB-5 XSB-6 SiO2 4.48 9.78 9.59 4.32 41.68 43.65 Al2O3 75.62 69.22 71.04 76.55 39.96 38.38 Fe2O3 0.76 0.87 0.76 0.73 0.69 0.61 MgO 0.25 0.52 0.56 0.26 0.98 0.70 CaO 0.20 0.15 0.13 0.11 0.17 0.17 Na2O 0.05 0.07 0.05 0.04 0.10 0.05 K2O 0.58 1.46 1.38 0.59 0.49 0.61 MnO 0.008 0.007 0.009 0.008 0.006 0.006 P2O5 0.452 0.315 0.188 0.141 0.059 0.056 TiO2 3.305 4.131 2.634 3.141 2.259 1.883 S 0.034 0.042 0.006 0.062 0.002 0.182 LOI(烧失量) 14.14 13.04 13.22 14.10 13.29 13.30 合计 99.88 99.61 99.55 100.05 99.69 99.59 Al/Si比值 16.88 7.08 7.41 17.72 0.96 0.88 
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