铁尾矿制备BaO-Fe2O3-SiO2微晶玻璃的晶化过程  

Crystallization on BaO-Fe_2O_3-SiO_2 glass-ceramic made from iron ore tailing

作　　者：于洪浩[1,2] 薛向欣[1] 黄大威[1] 

机构地区：[1]东北大学材料与冶金学院,沈阳110004 [2]沈阳理工大学材料科学与工程学院,沈阳110168

出　　处：《中国有色金属学报》2008年第11期2076-2081,共6页The Chinese Journal of Nonferrous Metals

基　　金：辽宁省自然科学基金资助项目(20042023);国家自然科学基金资助项目(50574030)

摘　　要：以鞍山铁尾矿为主要原料制备BaO-Fe2O3-SiO2系微晶玻璃,并利用DSC、XRD、SEM以及FT-IR对微晶玻璃的晶化过程和微观结构进行研究。结果表明:DSC曲线上出现的放热峰所对应的温度800℃和870℃分别为BaSi2O5相与BaFe12O19相的析晶温度;微晶玻璃晶化过程中的初晶相为BaSi2O5,中间过渡相为Ba2FeSi2O7,并随着温度的升高而消失,最终形成主晶相BaFe12O19,次晶相为BaSi2O5的微晶玻璃;随着晶化温度的升高,微晶玻璃的红外吸收带在800～700 cm-1波长范围发生宽化,在1 100～900 cm-1和500～400 cm-1波长范围内发生分裂;玻璃结构中的[FeO4]向[FeO6]转化促进玻璃的析晶,出现BaFe12O19的红外特征吸收峰。BaO-Fe2O3-SiO2 system glass-ceramic was synthesized from iron ore tailing of Anshan as starting material. The crystallization process and microstructure of the glass-ceramic were investigated using differential scanning calorimetry （DSC）, X-ray powder diffraction（XRD）, scanning electron microscopy（SEM） and fourier transform infrared spectroscopy（FT-IR）.The DSC results show that exopeak temperatures at 800 and 870 ℃ correspond to the crystalline phase formation of BaSi2O5 and BaFe12O19, respectively. The initial crystalline phases of the sample are BaSi2O5 and Ba2FeSi2O7 as transition crystalline phase changed into BaFe12O19 with increase of temperature. The final crystalline phases of the glass-ceramic are BaFe12O19 and BaSi2O5. With the increase of crystallization temperature, infrared absorption bands of the sample are broaden within the range of 800-700 cm^-1 and are splitted within the range of 1 100- 900 cm^-1 and 500-400 cm^-1. The crystallization is accelerated by [FeO4] fundamental unit shifted to [FeO6] in the glass structure, and BaFe12O19 as the final crystalline phase is observed. Key words： iron ore tailing; glass-ceramic; BaFe12O19; crystallization

关 键 词：铁尾矿 微晶玻璃 BAFE12O19 晶化过程 

分 类 号：TB321[一般工业技术—材料科学与工程]