Preparation of glass-ceramic materials from rare earth tailings

摘要

Glass-ceramics materials based on rare earth tailings were prepared by conventional molten cooling method and crystallization process. The composition of the matrix glass was determined by the phase diagram of CaO-Al_2O_3SiO_2 and up to 60 wt% rare earth content was utilized. The phase composition and microstructure of the prepared glass-ceramics materials was tested and observed by DSC, XRD and SEM. The results show the predominant crystal phase of the prepared glass-ceramics is calcium silicate when crystallization temperature ranges from 950 °C to 1050 °C. When crystallization temperature is 950°C, a large number of glass phase and spherical crystal with size of 20um coexisted. While the crystalline phase of calcium silicate turned to lamellar from spherical and glass phase disappeared when treating temperature increased to 1050°C.