摘要
采用XRD、原矿化学多项分析、镜下鉴定及扫描电镜等对广西金龙铝土矿的物质组成、化学成分、晶体化学和嵌布特征进行了系统研究.结果表明:矿石以一水硬铝石为主(36.5%),含三水铝石、黏土矿物、赤铁矿等;Al2O3平均品位约44%,铝硅比均值约3.57,属于低品位铝土矿石;一水硬铝石属斜方晶系双锥体类,在矿石中嵌布主要呈自形和半自形晶、豆状和鲕状、隐晶质和微晶集合体3种形式,与高岭石、叶腊石等嵌布伴生;高岭石属三斜晶系的层状结构硅酸盐矿物,多以隐晶质致密状或土状集合体形式嵌布;叶腊石属单斜晶系的二八面体结构含水铝硅酸盐矿物,以隐晶质细小鲕片状集合体形式嵌布,伴有赤铁矿、金红石等.
The mineral components, chemical composition, crystal chemistry and dissemination characteristics of the Jinlong bauxite deposit were systematically studied using a XRD, chemi- cal analysis, microscopic identification and SEM analysis. The results show that the main min- erals are diaspora （36.5%）, gibbsite, clay minerals and hematite. The average grade of Al2O3 in the Jinlong bauxite deposit is 44%, and A/S is about 3.57. Jinlong bauxite deposit is defined as low-grade bauxite. Diaspora represents an orthorhombic dipyramidal class, and mainly have following three dissemination forms： euhedral and subhedral grain, bean and oolitic shaped, aphanitic and microcrystalline aggregates, and always accompanied by kaolinite and pyrophyl- lite. Kaolinite is a triclinic crystal layered silicate mineral, with implicit crystalline density or soil aggregates. Pyrophyllite is a monoclinic two-octahedral hydrous aluminum silicate mineral, with aphanitic small oolitic flake aggregates, accompanied by hematite, rutile, and so on.
出处
《中国矿业大学学报》
EI
CAS
CSCD
北大核心
2015年第2期341-348,共8页
Journal of China University of Mining & Technology
基金
中央级公益性科研院所基本科研业务费专项资金项目(K1312)
地质矿产调查评价项目(1212011220806
12120114004001)
关键词
金龙铝土矿
堆积型铝土矿
晶体化学
嵌布特征
Jinlong bauxite deposit
accumulation type bauxite
crystal chemistry
dissemina-tion characteristics
