Ca_(0.9)Ce_(0.1)Ti_(0.8)Al_(0.2)SiO_5在水热作用下的化学稳定性

Chemical Durability of Ca_(0.9)Ce_(0.1)Ti_(0.8)Al_(0.2)SiO_5 at Hydrothermal Conditions

通过固相法合成掺铈榍石固溶体(Ca0.9Ce0.1Ti0.8Al0.2SiO5),采用PCT粉末浸泡试验法,借助X射线衍射(XRD)、扫描电镜(SEM)、电感耦合等离子体发射光谱(ICP-OES)等分析测试手段,研究掺铈榍石固溶体在热液作用下的稳定性。实验结果表明,掺铈榍石固化体在不同条件下(温度150～200℃,0.476～1.554 MPa,pH值5～9),都具有良好的稳定性。随着浸泡时间的增加,各元素的归一化浸出率逐渐降低并保持在较低水平。

The sphene doped cerium（Ca 0.9 Ce 0.1 Ti 0.8 Al 0.2 SiO 5） was synthesized by solid-reaction.The chemical durability was investigated with a long-term product consistency test（PCT） by X-ray diffraction（XRD）,scanning electron microscopy（SEM）,and inductively coupled plasma atomic emission spectrometry（ICP-OES）.The results indicated that the synthesized sphene has good chemical durability under coupling effect of hydrothermal conditions of 150 ～ 200℃,0.476 ～ 1.554 MPa,and 5 ～ 9 pH.With the increase of soaking time,the normalized leaching rate of elements gradually decreases and maintaines at a lower level.