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Interaction and stabilization of organic radioactive waste in geopolymer

地质聚合物中有机放射性废物的相互作用和稳定化

基本信息

批准号：
21K04207
负责人：
Y Elakneswaran
金额：
$ 2.66万
依托单位：
Hokkaido University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2021
资助国家：
日本
起止时间：
2021-04-01 至 2024-03-31
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-21K04207/
关键词：
Cement chemistry Geopolymer Radioactive waste Oil Modelling

项目摘要

This year research work focused on solidifying organic compounds in geopolymer. Metakaolin (MK) from Sobueclay, Japan, potassium silicate alkali activated solution (AAS), and lubricant oil from ENEOS FBK turbine 32 were used to prepare the geopolymer-oil composite (GPOIL). The AAS was prepared by mixing the potassium silicate (originally containing 29.1 wt.% SiO2, 21.9 wt.% K2O, 49.0 wt.% H2O), potassium hydroxide, and purified water. The alkaline solutions synthesising the geopolymer samples are defined as K2O: SiO2: H2O (molar ratio) 1:1:13. AAS was mixed with oil (0-50% by volume) for 5 min at 10,000 rpm to produce an emulsion. CetylTrimethylAmonium Bromide (CTAB) cationic surfactant was used, which was mixed with AAS and oil (1 g of surfactant for 100 mL of AAS). The prepared geopolymer-oil composite was cured at 20 C and RH 99% for 7 and 28 days. The metakaolin-based geopolymer could not solidify the oil. However, the geopolymer can successfully solidify oil content with the help of a surfactant that changes the surface of the oil from negative to positive, allowing it to interact with the opposing surface of the geopolymer. The compression strength test was conducted on GPOIL-surfactant with oil content from 0% to 50%. As the oil content increased, the compressive strength of the composite decreased due to increment of porosity induced by the presence of oil. This can be attributed to the fact that as the oil content and porosity increased, the number of effective bonding points decreased, resulting in a decrease in strength.

今年的研究工作集中在有机化合物在地聚合物中的固化。以日本Sobueclay的偏高岭土（MK）、硅酸钾碱活化溶液（AAS）和ENEOS FBK涡轮32润滑油为原料制备地聚合物-油复合材料（GPOIL）。原子吸收光谱是由硅酸钾（原含29.1 wt.% SiO2, 21.9 wt.% K2O, 49.0 wt.% H2O）、氢氧化钾和纯净水混合制备的。合成地聚合物样品的碱性溶液定义为K2O: SiO2: H2O（摩尔比）1:1:13。AAS与油（体积0-50%）在10,000 rpm下混合5min，形成乳液。采用十六烷基三甲基溴化铵（CTAB）阳离子表面活性剂，与原子吸收剂和油（表面活性剂1g / 100ml原子吸收剂）混合。将制备的地聚合物-油复合材料在20℃、99%的相对湿度下固化7天和28天。偏高岭土基地聚合物不能使原油凝固。然而，在一种表面活性剂的帮助下，地聚合物可以成功地固化含油量，这种表面活性剂将油的表面从负电荷变为正电荷，使其能够与地聚合物的相反表面相互作用。对含油量为0% ~ 50%的gpoil表面活性剂进行了抗压强度试验。随着含油量的增加，复合材料的抗压强度降低，这是由于油的存在导致孔隙率的增加。这可以归因于随着含油量和孔隙度的增加，有效粘结点的数量减少，从而导致强度下降。