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- Title
Recovery of uranium phosphate by a stepwise thermal treatment of uranium-bearing spent TBP.
- Authors
Yang, Hee-Chul; Kim, Hyung-Ju; Yang, In-Hwan; Choi, Yun-Jung; Lee, Si-Young; Chung, Dong-Yong; Moon, Jei-Kwon
- Abstract
A stepwise thermal treatment process for the recovery of uranium phosphate from uranium-dissolved spent TBP was demonstrated. The pathway of the reactions involved in the thermal decomposition and oxidation processes of uranium-bearing spent TBP was established based on the results of thermogravimetric analyses. Relatively low-temperature pyrolysis is required to avoid the condensation of corrosive phosphoric acid via vaporization. Low-temperature pyrolysis residue was analyzed and found to be composed of pyrocarbon, phosphorus oxide (PO) and two types of uranium phosphate (UPO and UPO). Uranium pyrophosphate (UPO) was recovered from the burning out of pyrocarbon in the pyrolysis residue after the dissolution removal of phosphorus oxide in water. A substantial recovery of uranium by the proposed stepwise thermal treatment method was successfully demonstrated by a treatment of pyrolysis residue from a bench-scale low-temperature pyrolysis process.
- Subjects
URANIUM; PYROLYSIS; CHEMICAL reactions; VAPORS; ACTINIDE elements
- Publication
Journal of Material Cycles & Waste Management, 2016, Vol 18, Issue 3, p437
- ISSN
1438-4957
- Publication type
Article
- DOI
10.1007/s10163-016-0467-2