The effect of high temperature treatment on the structure of sodium bentonite montmorillonite

Abstract:

The bentonite from Wuhu, Anhui (WH), Santai, Sichuan (ST), and Xinyang, Henan (XY) were used as the raw material, and sodium carbonate was used as a modifying agent to modify three raw materials (named as WH-G, XY-G and ST-G), then the sodium samples were heat-treated at high temperature. The phase, structure, thermal properties and spectral characteristics of samples were characterized and analyzed. The results showed that the temperature of the montmorillonite losing adsorbed water and interlayer water in the three samples WH-G, XY-G and ST-G increase with the increase of the layer charge number of the montmorillonite in the samples, but its thermal stability is opposite. The structures of montmorillonite WH-G and XY-G samples are completely destroyed at 900 °C, while the structure of montmorillonite of ST-G sample is completely destroyed at 800 °C.