晶化工艺对铁尾矿微晶玻璃微观结构的影响

以铁尾矿为主要原料制备微晶玻璃,通过DTA,XRD,SEM分析方法,全面考察了晶化温度和晶化时间对微晶玻璃结构的影响.实验发现:随着析晶温度的升高,主晶相钙铁辉石没有改变,但晶体形态和析晶率发生了较大的变化;随着析晶温度的升高,晶体的规则程度增加,晶体尺寸增大,析晶率呈先增加后减小的趋势;当析晶温度高于1250℃时,晶体分布均匀程度降低;最佳晶化温度为1200~1250℃,晶化时间为180 min.

Effect of Crystallization Process on Microstructure of Glass-Ceramics from Ferrous Tailing

Glass-ceramics were prepared from ferrous tailing as the main raw material. The effect of crystallizing temperature/time on the microstructure of glass-ceramics was investigated comprehensively by DTA, XRD and SEM. It was found that the major crystalline phase is hedenbergite existing in the sample. Which remains unchanged with increasing crystallizing temperature though the crystalline morphology and crystallization rate change greatly. Furthermore, the crystals become more regular and crystal size becomes bigger with increasing crystallizing temperature, and the crystallization rate increases first and then decreases. When the temperature is higher than 1250°C, the crystal distribution becomes less uniform, and the optimum crystallizing temperature and time are 1200-1270°C and 180 min, respectively.