Reduction and removal of neptunium from synthetic high level liquid waste by TRPO process |
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Authors: | Shaowei Li Jing Chen Jianchen Wang |
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Institution: | (1) The Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing, 100084, China |
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Abstract: | Valency control of neptunium is an important issue in the partitioning of high level liquid waste (HLLW) from power-reactor
spent fuel treatment. The redox behavior of neptunium in HLLW is quite different from that in nitric acid because of the effect
of the large amount of ions in HLLW. In order to remove neptunium from HLLW, we studied the reduction of neptunium in synthetic
HLLW (SHLLW) to maintain its valency at IV so that it can be extracted by TRPO extractant in the well developed Chinese TRPO
process. Five different reductants were tested and the reduction behavior was investigated. The influence of some active elements
in SHLLW was studied. The mechanism that the reductants react with neptunium through Fe element was supposed and proved by
experiments. The reduction rate of Np(V) was highly enhanced by Fe element. Finally, a hybrid reductant was suggested and
good reduction efficiency was obtained. |
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