Infrared Spectra of Crystallization of Glasses Using Red Mud as Raw Materials
赤泥黑色玻璃晶化过程的红外光谱研究

FTIR absorption spectra and XRD were used to study the structure of glasses using red mud as raw materials. The results indicate that Ca(Fe, Mg)Si_2O_6 and 2C_aO.AL_2O_3.SiO_2 precfpitate as primary and minor crystalline phase respectively on crystallization processes of glasses. Glasses have interlinked SiO_4, AIO_4 and Fe(3 )O_4 tetrahedra as their most fundamental units with K~ , Na~ , Fe~(2 ) and some Fe~(3 ) ions acting as charge balancing canons. The shortrange order which is similar to the structure of Ca(Fe, Mg)Si_2O_6 exists in the glasses and has the precursor structures of primary crystalline phase. With the increase of Fe_2O_3 content, the random state of glass structure increases. The absorption bands of FTIR spectra become broaden and shift from the high frequency region to lower frequencies. With prolonging nucleation time and improving crystallization temperature, the strongest absorption bands also shift from the high frequency region to lower frequencies.