广西百色铝土矿工艺矿物学研究

Study on Process Mineralogy for Guangxi Baise Bauxite Ore

通过对广西百色某铝土矿矿石的多元素化学分析、光学显微镜鉴定等手段，对该铝土矿进行了详细的工艺矿物学研究，查明了矿石的物质组成、铝的赋存形式及矿物嵌布特征。研究结果表明：该试样Al2O3品位为57．46％，硅和铁含量较高，SiO2为6．97％，Fe2O3为16．13％。该试样含铝矿物主要是一水硬铝石，少量三水铝石和一水软铝石；含硅矿物主要为高岭石，少量绢云母和石英；含铁矿物主要为赤铁矿和褐铁矿。一水硬铝石、高岭石及浸染状的赤铁矿和褐铁矿的粒度均较细（0．005—0．01mm），部份胶结状的赤铁矿粒度较粗（0．01～2mm）。研究结果可为该铝土矿的除铁降硅选矿试验提供相应的依据和参考。

Through the chemical analysis of multi-elements of Guangxi Baise bauxite ore and the identification of optical microscopy, the research on mineralogical process was carried on this ore, verifying the ore material composition, occurrence and mineral dissemination characteristics of aluminum. The research results showed that the Al2O3grade of the samples was 57.46% and the content of SiO2and Fe2O3 was 6.97% and 16.13% respectively, which is relatively high. The minerals containing aluminum of the samples are mainly, a small amount of gibbsite and boehmite, minerals containing silicon mainly as kaolinite, a small amount of sericite and quartz; minerals containing iron mainly as hematite and limonite. The size of diaspore, kaolinite and disseminated hematite and limonite is relatively fine （0. 005 - 0.01 mm）, and the cemented hematite is relatively coarse （ 0.01 ~ 2mm）. The research results can provide reference for iron removal and silicon reduction process.