A Continous Denitration Process Using Chemical and Electrolytic Systems Accompanying the Precipitation of Metal Ions

概要

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This work has investigated an improvement for the usual batch denitration by formic acid. It studied several destruction characteristics of nitric acid and formic acid in a continuous denitration process newly suggest in this work which consisted of a continuous denitration by formic acid and a residual acid-electrolytic destruction system. Also, the precipitation behaviors of a few metal ions such as Mo, Zr, Nd, and Fe during the denitration were investigated. The continuous denitration by formic acid reached a steady state in 30 min and showed a dependency of the final acidity on the residence time of the feeding solution in the reaction. In a Ti–IrO2 electrolytic cell, the destructive rates of formic acid and nitric acid were 1.37×10−2 M·cm2/h·mA and 9.33×10−3 M·cm2/h·mA, respectively. The nitric acid was reduced at the Ti cathode and the formic acid was oxidized at the IrO2 anode. The suggested denitration process combining a chemical system and an electrolytic system could treat continuously a feeding nitric acid of 2.0 M below about 0.1 M. The precipitation of the metal ions occurred almost totally in the denitration column.
一般社団法人日本原子力学会の論文
2004-04-25