铁含量及价态对白云鄂博尾矿微晶玻璃析晶特性及性能的影响  

Influence of Content and Valence of Iron on Crystallization Characteristics and Properties of Baiyunebo Tailing Glass-Ceramics

作　　者：杜永胜[1,2] 李保卫 张雪峰[3] 贾晓琳[4] 陈华[2] 赵鸣[3] 邓磊波[3] 

机构地区：[1]内蒙古工业大学材料科学与工程学院,呼和浩特010051 [2]内蒙古科技大学数理与生物工程学院,包头014010 [3]内蒙古科技大学白云鄂博矿稀土及铌资源高效利用省部共建教育部重点实验室,包头014010 [4]郑州大学材料学院,郑州450052

出　　处：《人工晶体学报》2013年第10期2170-2176,共7页Journal of Synthetic Crystals

基　　金：国家重点基础研究发展计划(973计划)(2012CB722802);内蒙古创新引导基金(20111623)

摘　　要：以白云鄂博尾矿及粉煤灰等固体废弃物为主要原料,采用熔融法、经退火、核化及晶化热处理制备得到了以辉石为主晶相的CaO-MgO-Al2O3-SiO2(CMAS)系尾矿微晶玻璃。利用化学分析方法测定了不同氧化铁及碳含量对微晶玻璃中Fe3+/Fe2+的影响;利用XRD、DTA、SEM等研究了不同氧化铁及碳含量对微晶玻璃结构及析晶特性的影响。结果表明,不同氧化铁添加量对微晶玻璃中Fe3+/Fe2+影响很小,因此对微晶玻璃的析晶特性无本质影响。而随着还原碳粉的加入,Fe3+/Fe2+与未加碳粉相比减小明显,微晶玻璃中FeO质量分数的增加极大地提高了微晶玻璃的析晶特性。但过量的碳粉加入导致单质铁的析出,反而降低了微晶玻璃的析晶能力。上述析晶特性的变化直接影响到微晶玻璃的耐酸度及抗折强度。Glass-ceramics in the CaO-MgO-Al2O3-SiO2 （CMAS） quaternary system were prepared by the method of melting using solid waste, such as Baiyunebo tailing and fly ash as raw materials. The main crystalline phase of glass-ceramics was augite and the heat treatment process included annealing, nucleation and crystallization stage. The influence of different amount of iron oxide and carbon powder on the Fe3 ＋/Fe2 ＋ ratio in glass-ceramics was evaluated by the chemical analysis method. The effects of iron oxide and carbon powder on the structure and crystallization characteristics were studied by X-ray powder diffraction （ XRD）, differential thermal analysis （DTA） and scanning electron microscope （ SEM ）. The results showed that different iron oxide content had little effect on the Fe3＋/Fe2＋ ratio. Therefore, thecrystallization characteristics of glass-ceramic could not change as the additional iron oxide increasing. Meanwhile, the Fe3＋/Fe2＋ ratio in glass-ceramics decreased significantly with the carbon powder added. As a result, the increase of FeO （wt%） greatly improved the crystallization characteristics of the glass- ceramic. However, iron ions could be reduced to iron by reduction reaction with the carbon powder content further increase and the crystallization ability of glass-ceramic reduced accordingly. The above change of crystallization characteristics directly affected the acid-resistance and bending strength of the glass-ceramic.

关 键 词：白云鄂博尾矿 微晶玻璃 价态 辉石 

分 类 号：TQ171[化学工程—玻璃工业]