International Journal of Chemical Studies
Vol. 1, Issue 5 (2014)
Thermal Analysis of Nalco Red Mud
Author(s): S. N. Meher
Abstract: A NALCO red mud was thermally characterized. Chemical (major, minor and rare-earth elements) and mineralogical compositions were determined by XRF, ICP-MS and XRD techniques. The thermal events (TG/DTA/DSC) were observed in the range from room temperature to 1300 °C were related to the sample composition. The first mass loss step was related to free water content, while many of the other processes were related to dehydration processes. Three endothermic peaks were shown on DTA curve of red mud at temperature between 120-450 °C. The total mass loss in the red mud was found to be 12.70%, which was associated with moisture and water molecules in gibbsite, boehmite and diaspore phases. It was found that most of the decomposition reactions of hydrohematite, ferrihydrite, Aluminium goethite, boehmite, silicates and carbonates were strongly overlapping. It was also explained the formation of silicates and calcium titanate in between temperature range of 600-1000 °C which presence were confirmed by XRD. The ΔH for the decomposition of gibbsite and goethite and formation of silicates and calcium titanate are 102 mJ/mg and 55.6 mJ/mg respectively.
Pages: 01-09 | 1131 Views 16 Downloads
How to cite this article:
S. N. Meher. Thermal Analysis of Nalco Red Mud. Int J Chem Stud 2014;1(5):01-09.