浸出(土壤学)
钍
离子液体
表面改性
化学
残留物(化学)
吸附
萃取(化学)
阳离子聚合
废物管理
材料科学
有机化学
环境科学
冶金
催化作用
铀
土壤水分
土壤科学
物理化学
工程类
作者
Zhiyuan Zeng,Yun Gao,Shuainan Ni,Sijia Zhang,Xinyu Fu,Xiaoqi Sun
标识
DOI:10.1016/j.seppur.2023.123901
摘要
Thorium (Th) containing radioactive waste generated by ion-adsorbed rare earth ore (IATREO) separation plants poses a threat to the environment. The waste residue contains a much higher content of rare earth (RE) than the original IATREO. This study describes novel ionic liquids (ILs) containing cationic functionalization and evaluates their effectiveness in recovering Th and RE from the waste residue leaching solution (WRLS). Di-functionalization of the cation in ILs is more advantageous than mono-functionalization and non-functionalization, providing more coordination sites and achieving higher extraction and separation performance. In the simulated solution at an initial pH of 3, [OB2DTA][CA12] is able to extract 99.0% of Th and only 0.4% of RE, the Th/RE separation factor reaches 22114. The extraction reaction is carried out by an ion association mechanism. After 5 cycles of extraction-stripping-regeneration, the extraction and separation abilities of ILs remain stable. For the HCl leaching solution of waste residue, 99.5% of Th is separated in two extraction stages, while the total loss of RE is only about 15 mg/L. The recyclable separation strategy based on ILs simplifies the separation process of Th and RE, reduces chemical consumption, and provides a new idea for the treatment of IATREO waste residue.
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