热处理时间对透辉石系尾矿微晶玻璃析晶及其性能的影响

Diopside tailings-based glass-ceramics were prepared via melting method plus one-step crystallization heat treatment with Shandong gold tailings and Guyang iron tailings as the main raw material. Then the influence of heat treatment soaking time on the crystal growth and properties of the prepared glass-ceramics was investigated by DSC, XRD, Raman spectroscopy, SEM, and universal mechanical properties tester. The results show that diopside crystals can grow through nucleation and whereafter growth when heat treated at 720℃ for 30 min. With the increase of heat treatment time, the size of diopside crystals gradually increased and the morphology of the crystals evolved from spherical to dendritic. When the heat treatment temperature was 820℃, the morphology and structure of the diopside crystals did not change with the increase of soaking time. Thus, heat treatment at 820℃ for 2 h can be considered to be the optimal. The prepared glass ceramics exhibit an excellent comprehensive performance with density of 2.97 g/cm3, bending strength of 211.0 MPa, hardness of 789.0 MPa, acid resistance of 99.4% and alkali resistance of 99.3 % respectively.

Keywords： inorganic non-metallic materials ; tailing-based glass-ceramic ; soaking time ; diopside ; crystal growth