Precipitation of Zirconium and Molybdenum in Simulated High-level Liquid Waste Concentration and Denitration Process

This paper focuses on the precipitation behaviors of zirconium and molybdenum during concentration and denitration by using simulated HLLW. The dependences of precipitates on final acidity of nitric acid, concentration factors and initial mass ratio of Mo/Zr were investigated. As a result, the presence of zirconium molybdate hydrate (ZMH) is confirmed in all experiments by the analysis of X-ray diffraction (XRD), but mass ratio of Mo/Zr in ZMH shows large deviations from the precipitate yield of Mo/Zr in solution. This is considered as a result of the generation of amorphous precipitate of Mo.