为了利用大量的含铁铝硅酸盐固体废弃物制备具有高附加值的微晶玻璃,采用DTA、XRD、SEM、EDS等手段研究了Fe2＋、Fe3＋对CASM系微晶玻璃析晶性能的影响.结果表明,Fe2＋在微晶玻璃中与Mg2＋的作用相同,取代以网络外体形式存在的Al3＋,使得微晶玻璃的析晶温度逐渐下降,而对析晶能力几乎没有影响,并当Fe2＋掺入量为2%时,主晶相由铝黄长石转变为镁黄长石,在7.5%时,进一步转变为透辉石.Fe3＋掺量小于7.5%时,起到补充Si4＋不足的作用,当大于7.5%时,部分Fe3＋起到与Fe2＋、Mg2＋相同的作用,使得析晶温度呈先升后降的变化,在掺量为7.5%时,铝黄长石主晶相才开始转变为镁黄长石,在10%时,转变为透辉石,且析晶能力得到大幅提升.随着Fe2＋和Fe3＋含量增加,虽然微晶玻璃中主晶相的变化顺序相同,但Fe2＋具有降低微晶玻璃析晶温度的作用,而一定量的Fe3＋可作为晶核剂提高微晶玻璃的析晶能力.
To prepare the glass-ceramics with high-additional-value using aluminosilicate solid waste containing iron,the influence of Fe2＋ and Fe3＋ on crystallization property of CASM system glass-ceramics was investigated by means of DTA,XRD,SEM and EDS.The results indicate that the Fe2＋,or the Mg2＋,could replace the Al3＋ existing as the network modifier,so the crystallization temperature of glass-ceramics gradually decreases,and the main crystal phase of glass-ceramics transforms from the gehlenite into the akermanite when Fe2＋ content is 2.0wt%,then transforms into the diopside when it is 7.5wt%.However,crystallization ability is hardly affected by Fe2＋.The Fe3＋ exists as the network former and plays the supplement lack of Si4＋ role under 7.5wt%.But when the Fe3＋ content is higher than 7.5wt%,a part of Fe3＋,or the Fe2＋ and Mg2＋,exists as the network modifier.The crystallization temperature gradually increase at first and then decrease.Although the transformation sequence of main crystal phase is the same for the CASM system glass-ceramics with the increase of Fe2＋ and Fe3＋ content,the Fe2＋ has the ability to decrease the crystallization temperature,and the Fe3＋ could improve the crystallization ability as the nucleating agent.
参考文献
| [1] | 陈盛建 .低硅铁尾矿微晶玻璃的研制[D].武汉理工大学,2004. |
| [2] | 张杜杜 .赤泥微晶玻璃晶化行为及性能研究[D].华中科技大学,2006. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%