Autoclaving reaction activity of four kinds of silicate minerals

To study the effect of silicate minerals in tailings on autoclaving construction materials, the autoclaving reaction activity of hornblende, labradorite, albite, and biotite was analyzed by X-ray diffraction, thermogravimetry, scanning electron microscopy, energy dispersive X-ray spectroscopy, and infrared spectrometry. The results show that at 180℃ for 8 h, labradorite and albite have autoclaving reaction activity, but hornblende and biotite do not. Autoclaving products in the labradorite system contain hibschite and clinotobermorite, while in the albite system contain tobermorite. These products connect together, which helps to improve structural compactness. Na exists in tobermorite minerals, indicating that the minerals have the function of alkali binding.