广西贵港高铁型铝土矿的矿物学特征研究

Research on Mineralogical Characteristics of High-iron Bauxite in Guigang of Guangxi

针对贵港高铁型铝土矿的矿层地质特征、矿石成分、矿物组成以及矿物嵌布关系做了详细的研究,结果表明,贵港高铁型铝土矿矿层结构简单,容易开采;矿石中的Al2O3和Fe2O3总和为65%左右,TiO2含量为1.48%,Ga含量为0.005%~0.027%,A/S在1.2~2.5之间,属于高铁、低铝硅比难选红土型铝土矿。XRD和SEM-EDS分析表明,矿物组成主要为三水铝石、一水硬铝石、赤铁矿、针铁矿、霞石以及少量的锐钛矿和游离石英等,铁矿物、铝矿物、硅矿物三者相互胶结,颗粒微细,同时夹杂有少量的锐钛矿和霞石。

Geological characteristics of ore bed,ore composition,mineral composition and mineral disseminated relationship of high-iron bauxite in Guigang were researched in detail.The results showed that the structure of ore bed was simple and easily mined.The ore,which contained Al2O3 and Fe2O3 of 65%,TiO2 of 1.48%,Ga of 0.005% ~0.027%,and A/S of 1.2~2.5,belonged to high-iron and lateritic bauxite with low alumina-silica ratio.XRD and SEM- EDS analysis showed that ore composition mainly was gibbsite,diaspore,hematite,goethite,a little of anatase,free quartz and so on.Iron minerals,aluminum minerals and silicon minerals were firmly combined together as fine particles,with a spot of anatase and nepheline.