Preparation of Phosphate Glass by the Conventional and Microwave Melt-Quenching Methods and Research on Its Performance

In this study, various phosphate glasses (PGs) within the CaO-Na₂O-P₂O₅ and SiO₂-CaO-Na₂O-P₂O₅ systems were synthesized using both conventional and microwave melt-quenching techniques. The physical, thermal, and structural properties of these phosphate glasses, as well as their dissolution behaviors under varying temperatures and solvent conditions, were thoroughly examined. Additionally, the influence of scale inhibitor dosage, temperature, and pH on the rate of scale inhibition was assessed using a static scale inhibition test. The morphology and crystal types of the precipitates were characterized using Scanning Electron Microscopy (SEM) and X-ray Diffraction (XRD) analysis. The findings indicate that the PG structure predominantly consists of Q² structural units, with a minor presence of Q¹ units. The dissolution rate of PG escalates with an increase in temperature and a decrease in pH. Conversely, the scale inhibition efficiency diminishes with rising temperature and pH. Optimal scale inhibition efficiency, reaching up to 95.4%, was observed at a pH of 7 and a temperature of 50 °C. Under the influence of the PG scale inhibitor, the primary crystal form of CaCO₃ was altered from calcite to vaterite.