Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Gadolinium zirconate-based nuclear waste solidified body and preparation method thereof
The invention provides a preparation method of a gadolinium zirconate-based nuclear waste solidified body, and belongs to the technical field of nuclear waste treatment. The preparation method comprises the following steps: mixing: putting a matrix raw material and radioactive nuclear waste into a ball-milling tank, adding zirconium dioxide ball-milling beads and a dispersing agent, and carrying out ball-milling and mixing; drying: heating and stirring the obtained uniformly mixed slurry, and then drying; compression molding: carrying out compression molding on the dried mixed powder, demolding to obtain a biscuit of the rolled zircon pyrochlore, and carrying out isostatic cool pressing on the biscuit; and flash burning: sintering thebiscuit subjected to compression molding, electrifying from room temperature during sintering temperature rise, applying constant electric fields to two ends of the biscuit, and performing flash burning at the moment when the sintering temperature rises tothe flash burning temperature so as to quickly densify thebiscuit. According to the method, an electric field assisted sintering technology, namely flash sintering, is used, so that the furnace temperature during sintering of a solidified body can be remarkably reduced, the sintering time is shortened from 72 hours to 1-10 minutes, the preparation efficiency can be effectively improved, and an ideal material with a compact microstructure and excellent performance can be obtained.
本发明提供一种锆酸钆基核废料固化体的制备方法，属于核废料处理技术领域。包括：混料：将基体原料，放射性核废料装入球磨罐中，加入二氧化锆球磨珠和分散剂并球磨混合；干燥：将得到的混合均匀的浆料加热搅拌后进行干燥；模压成型：将干燥后的混合粉进行模压成型，脱模后得到轧锆烧绿石的素坯，将素坯进行冷等静压；闪烧：将模压成型后的坯体进行烧结，烧结升温时从室温开始通电，在坯体两端施加恒定电场，当烧结温度升高至闪烧温度的瞬间发生闪烧使胚体迅速致密化。本发明使用电场辅助烧结技术，即闪烧，可显著降低固化体烧结时的炉温，并将烧结时间由原来的72h缩短为1‑10min，能有效地提高制备效率，可得到微观结构致密，性能优良的理想材料。
Gadolinium zirconate-based nuclear waste solidified body and preparation method thereof
The invention provides a preparation method of a gadolinium zirconate-based nuclear waste solidified body, and belongs to the technical field of nuclear waste treatment. The preparation method comprises the following steps: mixing: putting a matrix raw material and radioactive nuclear waste into a ball-milling tank, adding zirconium dioxide ball-milling beads and a dispersing agent, and carrying out ball-milling and mixing; drying: heating and stirring the obtained uniformly mixed slurry, and then drying; compression molding: carrying out compression molding on the dried mixed powder, demolding to obtain a biscuit of the rolled zircon pyrochlore, and carrying out isostatic cool pressing on the biscuit; and flash burning: sintering thebiscuit subjected to compression molding, electrifying from room temperature during sintering temperature rise, applying constant electric fields to two ends of the biscuit, and performing flash burning at the moment when the sintering temperature rises tothe flash burning temperature so as to quickly densify thebiscuit. According to the method, an electric field assisted sintering technology, namely flash sintering, is used, so that the furnace temperature during sintering of a solidified body can be remarkably reduced, the sintering time is shortened from 72 hours to 1-10 minutes, the preparation efficiency can be effectively improved, and an ideal material with a compact microstructure and excellent performance can be obtained.
本发明提供一种锆酸钆基核废料固化体的制备方法，属于核废料处理技术领域。包括：混料：将基体原料，放射性核废料装入球磨罐中，加入二氧化锆球磨珠和分散剂并球磨混合；干燥：将得到的混合均匀的浆料加热搅拌后进行干燥；模压成型：将干燥后的混合粉进行模压成型，脱模后得到轧锆烧绿石的素坯，将素坯进行冷等静压；闪烧：将模压成型后的坯体进行烧结，烧结升温时从室温开始通电，在坯体两端施加恒定电场，当烧结温度升高至闪烧温度的瞬间发生闪烧使胚体迅速致密化。本发明使用电场辅助烧结技术，即闪烧，可显著降低固化体烧结时的炉温，并将烧结时间由原来的72h缩短为1‑10min，能有效地提高制备效率，可得到微观结构致密，性能优良的理想材料。
Gadolinium zirconate-based nuclear waste solidified body and preparation method thereof
一种锆酸钆基核废料固化体及其制备方法
XU CHEN (Autor:in) / WANG LIXIAO (Autor:in) / BAI BIN (Autor:in) / CAI SHIKUI (Autor:in)
12.02.2021
Patent
Elektronische Ressource
Chinesisch
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