中文摘要：

对云南某铝土矿矿石的矿物特性进行了研究。结果表明，矿石中的Al2O349．65％，SiO27．14％，Fe2O329．15％，TiO27．34％，铝硅比6．95；矿物组成以一水硬铝石、赤铁矿为主，其次为高岭石、锐钛矿、绿泥石、黄铁矿等，属于高铁高钛一水硬铝石型铝土矿，矿石中的Fe、Ti富集高，均具有回收利用的价值。矿石中的铝矿物多是含砾砂屑状、碎屑状；硅矿物主要以铝硅铁集合体分布在矿石中；铁矿物多是致密状、层纹状；钛矿物以独立矿物形式和类质同象形式存在于矿石中。研究结果可作为该铝土矿资源合理开发利用的基本参考依据。

英文摘要：

The mineralogical characteristics of bauxite in Yunnan were studied in the paper. The resuks showed that the chemical compositions of samples mainly included Al2O3 , SiO2 , Fe2O3 and TiO2, the content of them was 49.65%, 7.14%, 29.15% and 7.34% respectively, the A/S was 6.95, the ore was high - iron and high - titanium diaspore which the main mineral compositions were diaspore and hematite, followed by kaolinite, anatase, chlo- rite, pyrite etc. Moreover, the metal elements of Fe and Ti had high enrichment degree in bauxite, which should be recovered as important value metal a- luminum minerals were mostly gravel arene or fragmental texture. Silicon minerals were mainly aluminum - silicon - iron aggregate structure distributed in the ore. Iron minerals were massive or lamellar structure. Titanium minerals existed in the ore with the form of independent mineral or isomorphism. The results could be used as the basic reference for the rational exploitation of bauxite resource.