Mullite phase enhancement in Indian kaolins by addition of vanadium pentoxide

摘要

Mullite phase development in Indian kaolinites was investigated in the presence of vanadium pentoxide and characterized by X-ray diffraction, FESEM and FTIR spectroscopy. The addition of V_2O_5 markedly enhanced the amount of mullite phase and also lowered the mullitization temperature. The mullite phase was highly crystalline with rod shaped particles of average dimensions of 350-500 nm and 70-100 nm. A maximum of 27% increase in mullite phase was obtained at 7% (by mass) V_2O_5 after sintering at 1000 ℃ for 2 h.