硼硅酸盐玻璃固化体结构与化学稳定性研究  

The Study on Structure and Chemical Stability of Borosilicate Glass Wasteforms

作　　者：蔺海艳[1] 廖其龙[1] 牟涛[2] 万小刚[2] 

机构地区：[1]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西南科技大学,四川绵阳621010 [2]表面物理与化学国家重点实验室,四川绵阳621907

出　　处：《中国陶瓷》2013年第11期30-34,共5页China Ceramics

基　　金：国防基础科研计划资助(B3120110001);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开放基金资助(10zxfk02)

摘　　要：采用正交试验法研究了成分不同的硼硅酸盐玻璃固化体的结构和化学稳定性。用傅立叶变换红外光谱(FTIR)和X射线衍射(XRD)表征了固化体结构;用全谱直读等离子体发射光谱(ICP-OES)测定了浸出液中各浸出元素的含量,用溶解速率法(DR)研究了固化体化学稳定性。研究结果表明:当SiO2含量为52.5 wt%、(Na2O+K2O+Li2O+CaO+ZnO)和(B2O3+A12O3)的摩尔比为0.8、A12O3和B2O3的质量比为0.5、氧化铈含量为2.85 wt%时,所得硼硅酸盐玻璃固化体化学稳定性都最好,浸泡后表面被侵蚀程度最低且表面成分无明显变化,浸泡56天的质量损失速率仅为1.49×10-8g·cm-2·min-1,未检出模拟核素Ce和Gd的浸出,玻璃自身成分浸出量也相对其他成分玻璃固化体低。玻璃固化体由[BO4]和[SiO4]两种四面体基团紧密相连形成完整的网络结构。The structure and chemical stability of borosilicate glass wasteforms with different components were studied using orthogonal experiment. The structure of the wasteforms was characterized by Fourier transform infrared spectroscopy（FTIR）, the chemical stability was measured by using Dissolution Rate（DR） method, and the contents of leaching elements in leaching solution were determined by Direct Reading Plasma Emission Spectroscopy（ICP-OES）. The results showed that： the wasteform, with component of SiO2=52.5 wt%,（Na2O ＋ K2O ＋ Li2O ＋ CaO＋ ZnO）=0.8 wt%,（B2O3＋ A12O3）=0.5 wt% and CeO2=2.85 wt%, has optimum performances. It has best chemical stability and lowest degree of surface erosion, no significant change happened in surface composition after the soaking test. The value of DR is only 1.49×10-8g·cm-2·min-1 after soaking in water 56 days, no radionuclide Ce and Gd leached out and the glass component elements which leached out into the leaching solution were also lower than other glass wasteforms. [BO4] and [SiO4] two tetrahedral groups closely linked to form a compact and intact network in the structure of wasteform, and the chemical stability becomes better due to the existence of Al2O3 and SiO2 crystal phase with good chemical corrosion resistance in the structure.

关 键 词：正交法 硼硅酸盐玻璃 固化体 化学稳定性 

分 类 号：TB332[一般工业技术—材料科学与工程]