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    • 2. 发明申请
    • ENCAPSULATION OF WASTE
    • 废物包埋
    • WO0135422A3
    • 2002-03-21
    • PCT/GB0004284
    • 2000-11-08
    • BRITISH NUCLEAR FUELS PLCAUSTRALIAN NUCLEAR SCIENCE TECMADDRELL EWAN ROBERTCARTER MELODY LYN
    • MADDRELL EWAN ROBERTCARTER MELODY LYN
    • C04B35/00G21F9/16G21F9/30
    • G21F9/162
    • The invention relates to a ceramic material for the encapsulation of high level radioactive waste, e.g. resulting from the reprocessing of irradiated nuclear fuel. Waste streams which are likely to arise in the future due to developments to the so-called PUREX process (so-called Advanced PUREX process) may not be suitable for containment by the established vitrification technique. The invention provides a ceramic waste immobilising medium in which waste from reprocessed nuclear fuel assemblies is contained and in which waste ions from at least fission products in irradiated nuclear fuel may be dissolved in substantially solid solution form, the ceramic waste immobilising medium having a matrix comprising phases of hollandite, perovskite and zirconolite in which matrix said waste ions are dissolved, wherein the waste comprises significant amounts of material from non-fuel components of fuel assemblies. Also provided is a method of immobilizing waste from reprocessed nuclear fuel assemblies, the method comprising the steps of mixing a liquor containing said waste with a precursor material comprising oxides or oxide precursors of at least titanium, calcium and barium to form a slurry; drying said slurry; and calcining said dried slurry under a reducing atmosphere to form a powder, the powder comprising 30-65 weight % waste.
    • 本发明涉及一种用于包封高放射性废物的陶瓷材料,例如, 由辐射核燃料的后处理造成的。 由于所谓的PUREX工艺(所谓的高级PUREX工艺)的发展,将来可能出现的废物流可能不适合通过已建立的玻璃化技术进行遏制。 本发明提供了一种陶瓷废物固定介质,其中包含来自再处理的核燃料组件的废物,其中来自辐射核燃料中的至少裂变产物的废物离子可以以基本上固溶的形式溶解,陶瓷废物固定介质具有基体, 其中基质表示废物离子溶解的地质矿,钙钛矿和锆石,其中废物包含大量来自燃料组件的非燃料组分的材料。 还提供了一种固定来自再处理核燃料组件的废物的方法,所述方法包括以下步骤:将含有所述废物的液体与包含至少钛,钙和钡的氧化物或氧化物前体的前体材料混合以形成浆料; 干燥所述浆料; 并在还原气氛下煅烧所述干燥的浆料以形成粉末,所述粉末包含30-65重量%的废物。