氧化硼对铁磷酸盐玻璃陶瓷固化体的影响

Effect of B2O3 on Iron Phosphate Glass-Ceramic Wasteforms

  • 摘要: 研究了不同B2O3掺量对铁磷酸盐玻璃陶瓷高放废物固化体结构和性能的影响。应用溶出速率法(DR)对固化体进行了化学稳定性测试,使用傅里叶变换红外光谱(FTIR)和X射线衍射(XRD)方法研究了样品的结构。研究结果表明:玻璃陶瓷固化体的主晶相为独居石;B2O3的引入对玻璃陶瓷固化体的化学稳定性影响较大,以10%(摩尔分数)的B2O3代替Fe2O3制得的固化体化学稳定性最佳,其28 d的质量浸出率约为7.81×10-9g•cm-2•min-1;试样中存在大量正磷酸基团PO43-和少量焦磷酸基团P2O74-,无偏磷酸基团PO3-存在,固化体中的B主要以BO4四面体基团形式存在。

     

    Abstract: The effects of doping iron phosphate glass-ceramic wasteforms containing high level waste (HLW) with different B2O3 contents on their structures and properties were investigated. The chemical durability of glass-ceramic wasteforms was measured by dissolution rate (DR) method. The structure of the glass-ceramic wasteforms was analyzed by Fourier turning infrared (FTIR) and X-radiation diffraction (XRD). The results show that glass-ceramic wasteforms have the main crystalline phase of monazite. There are great effects of wasteforms on the chemical durability. The 28 d leaching rate of glass-ceramic watesforms is 7.81×10-9 g/(cm2•min) when 10% (mole percent) Fe2O3 is replaced by B2O3 in watesforms. Samples exist a large number of PO43-, a small amount of P2O74- and no PO3-. Boron in wasteform samples is present as tetrahedral BO4 units.

     

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