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首页> 外文会议>Symposium on Actinides - Basic Science, Applications and Technology; 20031201-20031203; Boston,MA; US >Synthesis, Characterization, Sintering and Leaching of Thorium ― Uranium (IV) Phosphate Diphosphate Solid Solutions from Low-Temperature Precursors
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Synthesis, Characterization, Sintering and Leaching of Thorium ― Uranium (IV) Phosphate Diphosphate Solid Solutions from Low-Temperature Precursors

机译：低温前驱体对-铀（IV）磷酸二磷酸盐Thor的合成，表征，烧结和浸出

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摘要

In the field of the immobilization of high level activity and long life radwaste for a deep underground repository, several phosphate matrices were already proposed to delay the release of actinides to the biosphere. Among them, Thorium Phosphate-Diphosphate (TPD) and associated solid solutions were considered. In order to improve the homogeneity of the samples prepared, a new way of preparation based on the precipitation in closed containers, at 150℃, of the Thorium-Phosphate HydrogenPhosphate hydrate (TPHP) or associated Thorium ― Uranium (IV) Phosphate HydrogenPhosphate hydrate (TUPHP) was developed. Well crystallized and single phase TUPD solid solutions of general formula Th_(4-x)U_xP_6O_(23) were prepared after heating above 950℃. Dense TUPD pellets were also obtained through a two-steps procedure involving a uniaxial pressing of the powder at room temperature then a heating treatment at 1250℃ for 10 hours. Several properties of the pellets such as their chemical durability during leaching tests were considered carefully. All the normalized dissolution rates of powdered and sintered TUPD solid solutions remained low by comparison to that reported for several other ceramics studied in the same objective.
机译：在为深层地下储存库固定高活性和长寿命放射性废物的领域中，已经提出了几种磷酸盐基质以延迟of系元素向生物圈的释放。其中考虑了磷酸二氢Thor（TPD）和相关的固溶体。为了提高所制备样品的均一性，一种新的制备方法是基于密闭容器中150℃下的Thor磷酸盐磷酸盐水合物（TPHP）或相关的Thor-铀（IV）磷酸盐磷酸盐水合物（ TUPHP）。在950℃以上加热后，制备出具有良好结晶性的通式Th_（4-x）U_xP_6O_（23）的单相TUPD固溶体。还通过两步法获得致密的TUPD颗粒，该过程包括在室温下对粉末进行单轴压制，然后在1250℃下热处理10小时。仔细考虑了颗粒的一些性能，例如在浸出试验中的化学耐久性。与针对同一目的研究的其他几种陶瓷所报告的相比，粉末和烧结TUPD固溶体的所有归一化溶解率均保持较低。

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