Structural, thermal properties and chemical durability of aluminosilicate glasses prepared by Bayer red mud

Abstract

Two series of glass which are based on the particularity of iron oxide in the Bayer red mud, dolomite, pyrophyllite, quartz powder, fluorite, and industrial Al2O3 were prepared. The structure, thermal properties, and chemical durability of the prepared glasses were investigated. X-ray diffraction patterns showed no peaks of crystallization. Result of Fourier transform infrared shows that the existence of ~992 cm−1 in SF series can be assigned to mixed anion structure of [TO4] (T = Si, Al) tetrahedra. For the AF series samples, the Si-O network gradually depolymerized as the decrease of Fe2O3 when the content of SiO2 remained unchanged. Differential scanning calorimetry analysis shows that, as the content of Si/Fe and Al/Fe increased, the glass-transition temperature of glass approximately showed an increase tendency. From the chemical durability experiment results, the presence of TiO2, Fe2O3, etc. in the Bayer red mud improved the resistance to chemical corrosion (especially in acid and alkali resistance) of the glasses, bringing about corrosion resistance close or be superior to that of E-glass and AR-glass, which can be applied in the preparation of aluminosilicate-based glass fiber.