Stability of K-struvite in High Temperature and Acid-base Environment

K-struvite was prepared by precipitation method, and the stability of K-struvite in high temperature and acid-base environment were investigated by X-ray diffraction (XRD), thermogravimetric analysis (TG/DSC), and infrared spectroscopy (FT-IR). The results show that K-struvite decomposes from 50 to 110 °C, and the mass loss begins at 50 °C before being completely destroyed at 110 °C, then further heating at temperature above 500 °C leading to complete loss of the binding water in K-struvite. Moreover, K-struvite is more stable in alkaline environments than acidic environment.