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.
出处
《人工晶体学报》
EI
CAS
CSCD
北大核心
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)
