Bauxite, the primary economic raw material for aluminum production, is extensively used due to its affordability. The Al Ba’itha mine in Az Zabirah, Saudi Arabia, contains bauxite deposits with varying textures, including pisolitic, oolitic, and oolitic-conglomeratic forms. Predominant minerals within these deposits include gibbsite, boehmite, and diaspore. These deposits have elevated concentrations of Al₂O₃ and Fe₂O₃, with average values standing at 53.59 wt% and 12.12 wt%, respectively. Minor constituents such as goethite, hematite, and boehmite contribute to these compositions. The presence of SiO₂ (average: 7.59 wt%) and TiO₂ (average: 2.94 wt%) suggests the existence of rutile, anatase, and kaolinite. To assess the grade and mineralogical composition of bauxite, spectra were obtained using the GER 3700 spectroradiometer across low, medium, and high-grade samples. Notable features in the spectra include strong Al–OH vibrations at wavelengths approximately 1.5, 2.2, and 2.3 µm, indicative of bauxite’s presence. The presence of hematite, goethite, and gibbsite is discerned through absorption features at 0.48 and 0.88 µm. Furthermore, absorption properties near 2.3 µm suggest the existence of calcite, attributed to the CO₃ molecule. Analysis of the Fourier-transform infrared (FTIR) spectrum of bauxite reveals absorption bands associated with kaolinite, hematite, quartz, and gibbsite. Integration of X-ray diffraction (XRD), FTIR, and reflectance spectroscopy was useful in determining bauxite grade and mineralogical composition. These methods serve as efficient tools in the exploration and characterization of bauxite deposits, facilitating informed decision-making in aluminum production processes.

铝土矿是铝生产的主要经济原料，由于其价格低廉而被广泛使用。沙特阿拉伯扎比拉 (Az Zabirah) 的 Al Ba’itha 矿藏有不同质地的铝土矿矿床，包括豆粒岩、鲕粒岩和鲕粒-砾岩形态。这些矿床中的主要矿物包括三水铝石、勃姆石和水铝石。这些矿床的 Al ₂ O ₃ 和 Fe ₂ O ₃ 浓度较高，平均值分别为 53.59 wt% 和 12.12分别为重量％。诸如针铁矿、赤铁矿和勃姆石之类的次要成分对这些成分有贡献。 SiO ₂ （平均：7.59 wt%）和 TiO ₂ （平均：2.94 wt%）的存在表明存在金红石、锐钛矿和高岭石。为了评估铝土矿的品位和矿物成分，使用 GER 3700 光谱辐射计获取了低品位、中品位和高品位样品的光谱。光谱中的显着特征包括波长约为 1.5、2.2 和 2.3 µm 的强烈 Al-OH 振动，表明铝土矿的存在。通过 0.48 和 0.88 µm 处的吸收特征可识别赤铁矿、针铁矿和三水铝矿的存在。此外，2.3 µm 附近的吸收特性表明方解石的存在，归因于 CO ₃ 分子。对铝土矿的傅里叶变换红外 (FTIR) 光谱的分析揭示了与高岭石、赤铁矿、石英和三水铝石相关的吸收带。 X 射线衍射 (XRD)、FTIR 和反射光谱的集成有助于确定铝土矿品位和矿物成分。这些方法是铝土矿矿床勘探和表征的有效工具，有助于铝生产过程中的明智决策。