Cold sintering of iodine-hosted calcium hydroxyapatite was investigated for the development of a durable matrix for radioiodine immobilization. Single-phase, nano-crystalline, iodate-substituted calcium hydroxyapatite (IO-HAp) was synthesized by a wet precipitation method and sintering of the dried IO-HAp powder containing ∼7 wt% of substituted iodine was carried out at 200 °C under a uniaxial pressure of 500 MPa. It was demonstrated that a sintered relative density of 96.8% can be achieved without affecting the iodate nature of the substituted iodine. A product consistency test of the sintered samples was also carried out under a standard condition. The normalized leaching rates of Ca, P and I after seven days were 6.9 (±0.5) × 10⁻⁷, 2.6 (±0.2) × 10⁻⁷ and 2.4 (±0.4) × 10⁻⁵ g/m²/d, respectively, providing evidence of the durability of the cold sintered matrix and promise of using the cold sintering process for the conditioning of volatile element-bearing radioactive waste into solid waste forms.

研究了碘烧结的羟基磷灰石钙的冷烧结，以开发用于固定放射性碘的耐用基质。通过湿式沉淀法合成了单相，纳米晶，碘酸盐取代的羟基磷灰石钙（IO-HAp），并在200°C下于200°C下烧结了干燥的IO-HAp粉末（含约7 wt％的取代碘）。单轴压力为500 MPa。已经证明，在不影响取代碘的碘酸盐性质的情况下，可以达到96.8％的烧结相对密度。烧结样品的产品稠度测试也在标准条件下进行。7天后Ca，P和I的标准化浸出率分别为6.9（±0.5）×10 ^-7、2.6（±0.2）×10 ^-7和2.4（±0.4）×10^-5  g / m ² / d分别提供冷烧结基体耐久性的证据，并有望使用冷烧结工艺将含挥发性元素的放射性废物处理成固体废物。