Denitration of simulated high-level liquid waste by formic acid for the connection of PUREX process with TRPO process

摘要

Denitration of simulated high level liquid waste (HLLW) by formic acid was performed for the connection of Plutonium Uranium Recovery by EXtraction (PUREX) process with trialkyl phosphine oxide (TRPO) process. The concentration of acid, anions and metal ions in solution were monitored under different mole ratios of formic acid to nitric acid and denitration time. Precipitates formed were characterized by Scanning electron microscope, energy dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy and X-ray absorption near edge structure. This work presents a promising strategy for the connection of PUREX process with TRPO process and also provides some new information on the precipitation behavior in denitration of HLLW.