水滑石为前躯体合成尖晶石固化模拟90Sr

研究了以包容锶水滑石为前躯体合成尖晶石固化模拟⁹⁰Sr的方法，借助X射线衍射(XRD)、热重分析（TG）和浸出实验确定的包容锶尖晶石固化体制备的最佳条件为：煅烧温度为1 100℃、煅烧时间为4 h、锶包容量为0.648%。测定固化体的物理性能，采用PCT和MCC-1法研究其化学稳定性，利用扫描电镜能谱(SEM/EDS)分析固化体的组成、微观结构等。结果表明，制备的包容锶固化体具有良好的物理性能，显气孔率为0.07%，密度为4.8 g/cm³；固化体中的锶完全被尖晶石相所包容；PCT法浸出7 d后的锶元素归一化浸出率为5.2×10^-2g/（m²•d），固化体的化学稳定性良好。

Immobilization of Simulated 90Sr in Spinel Synroc Synthesized From Hydratalcite Precursor

Spinel synroc in which Sr (simulating ⁹⁰Sr) was embedded by using Sr-containing hydrotalcite as the precursor. The optimum conditions of spinel synthesis were determined by X-ray diffraction (XRD), thermogravimetric analysis (TG) and leaching experiments as follows: the calcining temperature 1 100℃, calcining time 4h and maximum Sr loading 0.648%. The mine phase assemblages and micro-structure of spinel synroc were analyzed by XRD and scanning electron microscopy with energy dispersive spectrometer (SEM/EDS). The chemical stability tests were carried out by MCC-1 method and PCT method. The results indicate that the prepared spinel synroc has good physical properties with density of 4.8 g/cm³ and open porosity of 0.07%. Sr is embedded into the crystal lattice of spinel. Under these conditions, the elemental nominalized leach rate of Sr is 5.2×10^-2 g/（m²•d） by PCT method at 90℃, the 7th day. The spinel synroc has a good chemical stability.