Al2O3对独居石玻璃陶瓷固化体的影响  

Effect of Al_2O_3 on Monazite Glass-ceramic Wasteform

作　　者：廖其龙[1] 廖春娟[1] 向光华[1] 潘社奇[2] 牟涛[2] 

机构地区：[1]西南科技大学四川省非金属复合与功能材料重点实验室-省部共建国家重点实验室培育基地,四川绵阳621010 [2]表面物理与化学重点实验室,四川绵阳621907

出　　处：《原子能科学技术》2014年第1期23-27,共5页Atomic Energy Science and Technology

基　　金：国防基础科研计划资助项目(B3120110001);国家自然科学基金资助项目(91126015);西南科技大学重点资助项目(11ZX2101)

摘　　要：本文研究了Al2O3掺量对独居石玻璃陶瓷固化体结构和化学稳定性的影响。用傅里叶变换红外光谱(FTIR)和X射线衍射(XRD)方法表征样品结构,用溶解速率法和全谱直读等离子体发射光谱(ICP-OES)分别测定样品在浸出液中浸泡后的失重速率及各元素的浸出浓度,以研究固化体的化学稳定性。研究结果表明:当Al2O3掺量为4%(摩尔分数)时,在980℃下保温3h得到的独居石玻璃陶瓷固化体具有较高的化学稳定性,浸泡14d时其质量浸出率最低,约为8.1ng/(cm2·min),其中Ce、La元素在浸出液中均未检出;固化体的主晶相为独居石,结构中含有大量稳定的正磷酸基团[PO4]3-和少量的焦磷酸基团[P2O7]4-,不存在偏磷酸基团[PO3]-。The effects of monazite glass-ceramic wasteforms containing different Al2O3 contents on their structures and properties were investigated .The structure of the glass-ceramic wasteforms was analyzed by Fourier transform infrared （FTIR） and X-radiation diffraction （XRD ） . The chemical stability of monazite glass-ceramic wasteforms was measured by dissolution rate and inductively coupled plasma optical emission spectrome-try （ICP-OES） method .The results show that the chemical stability of monazite glass-ceramic wasteforms with 4% （mole fraction） Al2O3 and made at 980 ℃ for 3 h is opti-mal .T he 14 d leaching rate of monazite glass-ceramic wasteforms is about 8.1 ng/（cm2 · min） ,which is the lowest in all the samples .The main crystalline phase of the as-prepared glass-ceramic wasteforms is monazite .There are a large number of [PO4 ]3 -groups ,a small number of [P2O7 ]4 - groups ,and no [PO3 ]- groups in the wasteforms .

关 键 词：铁磷酸盐玻璃 高放废物 固化体 玻璃陶瓷 

分 类 号：TQ171[化学工程—玻璃工业]