广西红黏土矿物成分分析

ANALYSIS OF MINERAL COMPOSITION OF RED CLAY IN GUANGXI

黏土矿物成分对其工程力学性质具有显著的影响。目前,在黏土矿物种类鉴定方面已有一些成熟的方法技术,而对黏土的矿物成分定量分析尚没有成熟的方法。本文基于X射线衍射试验、全化学元素分析、Bogue法和K值法,对广西武鸣、桂林两地红黏土的矿物成分进行了定性鉴定和定量分析。研究结果表明:(1)桂林、武鸣两地红黏土的主要矿物均为高岭石、三水铝石、针铁矿,桂林红黏土还含有一定量的石英。(2)武鸣红黏土的矿物成分及其含量依次为:高岭石(74.0%)、三水铝石(12.53%)、针铁矿(<2mm,2.22%)、针铁矿(>2mm,8.37%)。(3)桂林红黏土的矿物成分及其含量依次为:高岭石(56.59%)、三水铝石(11.44%)、针铁矿(15.61%)、石英(12.45%)。

The mineral composition of cohesive soil has a significant impact on its engineering and mechanical properties. There are some sophisticated methods and technology to identify clay minerals. However, the quantita tive measurement of clay minerals content in soil is still a question. The paper studies the chemical and mineralogi cal compositions of red clays in Wuming and Guilin by means of chemical analysis, Xray diffraction test, Bogue method and Kvalue method. The results show that Kaolinite, gibbsite, goethite are found in both clays and quartz is additionally found in Guilin red clay. The contents of Kaolinite, gibbsite, goethite （〈2mm） and goethite （〉 2mm） are respectively equal to 74.0% , 12.53% , 2. 22% and 8.37%in Wuming red clay. The contents of Kao linite, gibbsite, goethite and quartz are respectively 56. 59% , 11.44% , 15.61% and 12.45%in Guilin red clay.