Study on the adsorption behavior of UF 6 and MoF 6 on the NaF adsorbents
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Study on the adsorption behavior of UF6 and MoF6 on the NaF adsorbents Rongrong Cui1,2,3 · Zhiqiang Cheng1,2,3 · Qiang Dou1,2 · Qingnuan Li1,2 Received: 15 May 2020 / Published online: 14 September 2020 © Akadémiai Kiadó, Budapest, Hungary 2020
Abstract This work compared the adsorption behavior of UF6 and MoF6 on the NaF adsorbents. The results indicated that the amount of UF6 adsorbed on NaF adsorbents is six times that of MoF6 adsorbed on NaF adsorbents on the static adsorption model and the initial adsorption rate was as higher as 103 times, while in dynamic co-adsorption the difference in the adsorption amount was greater than 300; UF6 had a substitution effect on the MoF6 adsorbed on the NaF adsorbents; the optimal adsorption temperature for UF6 ranged from 100 to 150 °C. Keywords Adsorption behavior · UF6 purification · MoF6 · NaF adsorbents
Introduction The fluoride volatility process (FVP), based on the different volatilities between uranium hexafluoride ( UF6) and fluorides of fission products, is an extensively studied pyroprocessing technology for separating uranium from the spent nuclear fuel (SNF) [1–5], with the advantages of fast reaction rate, high conversion efficiency, and easy to operate continuously. The FVP mainly includes the fluorination of uranium compounds and the purification of the U F6 product. Adsorption and desorption have been developed for purification of the UF6 product, because of its clear principle and simple equipment. NaF is the most commonly used adsorbents in the purification of UF6 product, and it was Rongrong Cui and Zhiqiang Cheng contributed equally to this work and considered to be the co-first authors. * Qiang Dou [email protected] * Qingnuan Li [email protected] 1
Division of Radiochemistry and Engineering, Shanghai Institute of Applied Physics (SINAP), Chinese Academy of Science (CAS), Shanghai 201800, China
2
Center of Excellence TMSR Energy System, Chinese Academy of Sciences, Shanghai 201800, China
3
School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing 100049, China
first proposed by Cathers G.I. at Oak Ridge National Laboratory (ORNL). Cathers G.I. believed that the adsorption of UF6 with NaF absorbents was the most convenient way to capture, store and handle U F6 [6], and based on this, a set of U F6 purification process with function of selective adsorption and desorption was designed. Through controlling the temperature of NaF absorption trap, the separation of UF6 from most volatile impurities (Nb, Cr, Zr, Ru, etc.) was achieved [7, 8], which improved the purity of recovered UF6, however, the decontamination factor for M oF6 from UF6 product was only 36 [9], and it was also less than 50 in other literatures [10, 11]. MoF6 is a typical volatile impurity in UF6 product, which mainly derives from fission of nuclear fuel and corrosion of structural materials. M oF6 has similar physical and chemical properties with U F6 and both can form complexes with NaF through adsor
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