掺钕钙钛锆石、榍石组合矿物固化体的浸出性能

以硅酸锆(ZrSiO4)、碳酸钙(CaCO3)、二氧化钛(TiO2)、氧化铝(Al2O3)和氧化钕(Nd2O3)为原料,采用固相反应工艺,制备掺钕钙钛锆石、榍石组合矿物固化体,借助X射线衍射(XRD)、背散射二次电子像(BSE)、荧光光谱(FS)、能谱(EDS)等分析手段,研究掺钕钙钛锆石、榍石组合矿物固化体的化学稳定性。结果表明,钙钛锆石、榍石的组合矿物能很好地固溶Nd,固化体具有良好的化学稳定性;在90℃,第42d,CZ15-1260、CZA15-1260、CA15-1260固化体样品的平均归一化浸出率分别为1.82×10-4、1.38×10-4、1.48×10-4g·m-2·d-1;固化体的较佳烧结温度为1260℃。

Leaching Performance of Compounding Minerals of Zirconolite and Sphene Doped Neodymium

The synroc form of compounding minerals of zirconolite and sphene doped neodymium was prepared by using zircon, calcium carbonate, titanium dioxide, alumina, neodymium oxide as raw materials and solid phase reaction. The chemical durability of synroc form was researched by means of X-ray diffraction (XRD), backscattering scanning electron microscopy (BSE), energy dispersive spectroscopy (EDS), fluorescence spectrum (FS) and so on. The results indicate that the compounding minerals of zirconolite and sphene can dissolve commendably neodymium, and its synroc form has a good chemical durability. The unitary average leaching rates of neodymium of sample CZ15-1260, CZA15-1260 and CA15-1260 are 1.82×10^-4、1.38×10^-4、1.48×10^-4g•m^-2•d^-1, respectively at 90 ℃, the 42nd day. The better sintering temperature of synroc form is 1 260 ℃.