Evaluation of the Characteristics of Metal Nitrate Aqueous Solutions by Microwave Heating and the Morphologies of Synthesized Metal Oxide Powders

In the spent fuel reprocessing process, a mixed solution of uranyl nitrate and plutonium nitrate is converted into mixed oxide powder by the microwave heating. To evaluate the applicability to the industrial-scale and acquire the characteristics data of the microwave heating denitration of various metal nitrate aqueous solutions based on the knowledge studied in the development of laboratory-scale basic experiments, the microwave heating characteristics and metal oxide powder properties were investigated using cerium nitrate, cobalt nitrate and copper nitrate aqueous solutions. The progress rate of the denitration reaction was depended on the position, and the denitration reaction proceeded faster at the periphery than at the center. The morphologies of the synthesized products were porous and hard dry solid for cerium nitrate aqueous solution, foamed dry solid for cobalt nitrate aqueous solution, and powdery particles for copper nitrate aqueous solution. The denitration ratio and average particle size of the synthesized products increased in the order of the cerium nitrate aqueous solution, the cobalt nitrate aqueous solution, and the copper nitrate aqueous solution. The numerical simulations revealed that the periphery of the bottom surface of the metal nitrate aqueous solution was heated by microwaves. These simulation results were consistent with the experimental results in which the denitration reaction started from the periphery of the metal nitrate aqueous solution.

[1]  R. Parthasarathy,et al.  Modeling and kinetics study of novel microwave irradiation drying of naproxen sodium drug , 2019, Powder Technology.

[2]  A. V. Kioresku.  Applications of microwave energy in extractive metallurgy , 2018 .

[3]  E. C. Abdullah,et al.  Microwave sintering of zirconia-toughened alumina (ZTA)-TiO2-Cr2O3 ceramic composite: The effects on microstructure and properties , 2017 .

[4]  Jicheng Zhou,et al.  Highly effective direct decomposition of H2S into H2 and S by microwave catalysis over CoS-MoS2/γ-Al2O3 microwave catalysts , 2017 .

[5]  A. Huang,et al.  Validation of measured microwave absorption and temperature change for development of a single-mode-type microwave heating thermogravimetry apparatus. , 2017, The Review of scientific instruments.

[6]  Kunihiro Fukui,et al.  Influence of the heating method on the particle characteristics of copper oxide powders synthesized from copper nitrate aqueous solutions , 2016 .

[7]  Guoxiu Wang,et al.  Microwave synthesis of α-Fe2O3 nanoparticles and their lithium storage properties: A comparative study , 2015 .

[8]  Hideto Yoshida,et al.  Nickel oxide powder synthesis from aqueous solution of nickel nitrate hexahydrate by a microwave denitration method , 2015 .

[9]  E. Lust,et al.  Characterization of Terbium and Samarium Co-Doped Ceria Films Prepared Using Ultrasonic Spray Pyrolysis , 2015 .

[10]  Chao Yang,et al.  Synthesis and microwave modification of CuO nanoparticles: crystallinity and morphological variations, catalysis, and gas sensing. , 2014, Journal of colloid and interface science.

[11]  M. Yadav,et al.  Development of recycling processes for clean rejected MOX fuel pellets , 2014 .

[12]  Y. Kato.  Heating Efficiency of Microwave Heating Direct Denitration of a Mixture of Uranyl Nitrate and Plutonium Nitrate , 2014 .

[13]  W. Whittow,et al.  Electromagnetic simulation studies of microwave assisted heating for the processing of nanostructured iron oxide for solar driven water splitting , 2013 .

[14]  K. S. Hui,et al.  Synthesis of Co3O4 nanowires on nickel foam by a novel microwave-assisted template-free method , 2013 .

[15]  Kunihiro Fukui,et al.  Mechanism of synthesis of metallic oxide powder from aqueous metallic nitrate solution by microwave denitration method , 2012 .

[16]  Jamal Chaouki,et al.  Temperature profile prediction within selected materials heated by microwaves at 2.45GHz , 2012 .

[17]  M. Ozawa,et al.  Morphology of CuO through precipitation process under 2.45 GHz microwave irradiation , 2011 .

[18]  A. R. Daud,et al.  Synthesis and optical properties of CuO nanostructures obtained via a novel thermal decomposition method , 2011 .

[19]  Elson Longo,et al.  Structure and growth mechanism of CuO plates obtained by microwave-hydrothermal without surfactants , 2010 .

[20]  T. Ota,et al.  Synthesis of CeO2 nanoparticles by rapid thermal decomposition using microwave heating , 2010 .

[21]  M. Thumm,et al.  Measurement of dielectric constant and loss tangent of epoxy resins using a waveguide approach , 2006, 2006 IEEE Antennas and Propagation Society International Symposium.

[22]  C. Ehrhardt,et al.  Thermal decomposition of cobalt nitrato compounds: Preparation of anhydrous cobalt(II)nitrate and its characterisation by Infrared and Raman spectra , 2005 .

[23]  T. Abe,et al.  Dielectric Properties of Uranium and Plutonium Nitrate Solution and the Oxide Compounds Formed in the De-nitration Process by the Microwave Heating Method , 2004 .

[24]  Kazuo Aoki,et al.  A numerical and experimental investigation of the modeling of microwave heating for liquid layers using a rectangular wave guide (effects of natural convection and dielectric properties) , 2002 .

[25]  Rulin Dong,et al.  Processing of Ceria-Coated Alumina Fiber/Alumina Matrix Composite , 2000 .

[26]  Ian Turner,et al.  The use of a coupled computational model for studying the microwave heating of wood , 2000 .

[27]  C. Strydom,et al.  The thermal decomposition of cerium(III) nitrate , 1987 .

[28]  D. Dollimore,et al.  Deaquation and denitration studies on copper nitrate trihydrate , 1986 .

[29]  H. Akiyama,et al.  Development of a Process for Co-Conversion of Pu-U Nitrate Mixed Solutions to Mixed Oxide Powder Using Microwave Heating Method , 1983 .