【摘要】 利用"微波还原-磁选"除铁后的白云鄂博尾矿制备了CaO-Al2O3-SiO2(CAS)系微晶玻璃。借助差热分析、扫描电子显微镜和X射线能谱分析研究了CAS系微晶玻璃经680℃核化后不同晶化温度(870~930℃)对其析晶行为、显微形貌和性能的影响。结果表明:此CAS系微晶玻璃相组成随晶化温度的升高由长石相转变为辉石相,同时微晶玻璃中晶体形态逐渐长大,由方块状小颗粒微晶发育成板条状以及大颗粒的雪花状和方块状的"骨架"微晶;而且适当提高晶化温度有利于微晶玻璃的烧结致密化,进而提高其力学性能,900℃晶化处理的微晶玻璃抗折强度和密度分别为181.2 MPa和3.1 g·cm-3,而且其耐酸碱性能很好。本研究对于开发微晶玻璃新产品、新工艺有重要的指导意义。更多还原

【Abstract】 The CaO-Al2O3-SiO2(CAS) glass-ceramics were prepared from Bayan Obo tailings after ironremoving by " microwave reduction-magnetic separation". Effect of different crystallization temperatures(870-930 ℃) on the crystallization behavior,microstructure and properties of glass-ceramics samples heat-treated at nucleation temperature of 680 ℃ were analyzed by means of differential thermal analysis,scanning electron microscopy equipped with an energy dispersive X-ray spectrometer(SEM / EDS). The results showed that the feldspar phase in CAS glass-ceramics samples transferred into pyroxene phase and the crystals also grew up gradually with the increase of the crystallization temperatures, and the morphology changed from little blocky grains to lath-shape crystals,finally to big snowflake and blocky particles with skeleton structure. Moreover,raising crystallization temperature properly was beneficial to improve the sintering densification and then improve the mechanical property of the tailing glassceramics,and the glass-ceramics samples with the high bending strengths of 181. 2 MPa,bulk density of 3. 1 g · cm- 3were obtained by crystallizing at 900 ℃,having excellent properties of acid and alkali resistant. It has great insturctive significance for the new product and process development of glass-ceramics.更多还原