FOURIER TRANSFORM INFRARED SPECTROSCOPY AND THERMAL ANALYSES OF KAOLINITIC CLAYS FROM SOUTH AFRICA AND CAMEROON

被引：61

作者：

Diko, Makia ^{[1
]}

Ekosse, Georges ^{[2
]}

Ogola, Jason ^{[3
]}

机构：

[1] Univ Limpopo, Geol Div, P-B X1106, ZA-0727 Sovenga, Limpopo Provinc, South Africa

[2] Univ Venda, Directorate Res & Innovat, P-B X5050, ZA-0950 Thohoyandou, Limpopo Provinc, South Africa

[3] Univ Venda, Dept Min & Environm Geol, P-B X5050, ZA-0950 Thohoyandou, Limpopo Provinc, South Africa

来源：

ACTA GEODYNAMICA ET GEOMATERIALIA | 2016年 / 13卷 / 02期

关键词：

Kaolin; Thermal stability; Calcination; Structural order; Industrial application; SOUTHEASTERN BOTSWANA; DEPOSITS; GENESIS;

D O I：

10.13168/AGG.2015.0052

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

In this study, Fourier transform infrared (FTIR) spectroscopy, differential scanning calorimetry (DSC) and thermogravimetry (TGA) are used as complementary techniques to investigate structural order and phase transformation associated with thermal decomposition of selected kaolins from South Africa and Cameroon. The samples exhibit poorly resolved, weak intensity OH stretching and bending vibrations of structural water, characteristic kaolinite dehydroxylation temperatures (500 - 560 degrees C), low to high mass loss (6.5 to 19.4 %) and asymmetrical DSC curves. The results infer poor to partially ordered structures associated with significant quartz and iron oxide contamination. Compared against other commercial kaolins, the studied samples show moderate to good potentials for use in structural ceramics and refractories.

引用

页码：149 / 158

页数：10