Low‐temperature conversion of spent adsorbent to iodine sodalite by a mechanochemical route
Low‐temperature conversion of spent adsorbent to iodine sodalite by a mechanochemical route
复制标题
DOI：
10.1002/aic.12756
复制
发表时间：
2012-08
期刊：
影响因子：
3.7
通讯作者：
D. Hirabayashi;Y. Tanada;T. Sugiyama;Y. Enokida;Kayo Sawada
中科院分区：
文献类型：
--
作者：
D. Hirabayashi;Y. Tanada;T. Sugiyama;Y. Enokida;Kayo Sawada
重点介绍了球磨诱导转化法作为从沸石基碘吸附剂合成碘方钠石(Na8Al6Si6O24I2)的可能路线，以处理用于核设施尾气净化的放射性碘过滤器。用实验室规模的行星球磨机对模拟吸附剂碘化银和13X沸石的混合物进行了机械化学研磨。用X射线衍射仪对所得粉末进行了表征，确定了球磨时间对碘方钠石转化率的影响。对研磨相的晶粒度和晶格应变进行了分析。球磨后，用氢氧化钠溶液在150℃的高压釜中水热结晶48h，成功地得到了碘方钠石。在还原条件下进行了浸出试验，以评价碘的可浸性和化学耐久性。在硫代硫酸钠溶液中，浸出量为10−4∼10−5moldm−3数量级。©2011美国化学工程师学会学报，58：2441-2447,2012
The focus on a ball milling induced conversion as a possible synthesis route of iodine sodalite (Na8Al6Si6O24I2) from zeolite-based iodine adsorbents in order to treat a radioactive iodine filter for the off-gas cleaning during nuclear facilities is presented. A mixture of silver iodide and zeolite 13X as a simulated adsorbent was mechanochemically milled using a laboratory-scale planetary ball mill. The obtained powders were characterized by X-ray diffraction to determine the effect of milling time on the conversion of the iodine sodalite. The crystal grain size and the lattice strain of the grounded phases were evaluated. After the ball milling, the milled samples were hydrothermally crystallized to form a sodalite phase with a sodium hydroxide solution for 48 h in an autoclave maintained at 150°C. The iodine sodalite was successfully obtained after hydrothermal crystallization. A leaching test was carried out for the assessment of the order of iodine leachability and chemical durability under reducing conditions. The leaching amount was found to be low on the orders of 10−4 ∼10−5 mol dm−3 in sodium thiosulfate solution. © 2011 American Institute of Chemical Engineers AIChE J, 58: 2441–2447, 2012