Journal of Nuclear Science, Engineering and Technology (JONSAT)
In cooperation with the Iranian Nuclear Society

Sodium Fluoride Pellets Use in UF6 and HF Chemical Traps

Document Type : Research Paper

Authors

K Karimpour
S.J Safdari
S.M.A Mousavian
Abstract
Sodium fluoride is one of the most important adsorbents in enrichment facilities, where it is availabe in the form of powder and pellets. Linear and parabolic curve of the reaction between uranium hexafluoride and sodium fluoride, in the form of powder, in comparison with the parabolic curve of sodium fluoride in the form of pellets is shown that it is the best shape for the sodium fluoride adsorbents. But, it is impossible to determine these properties only by comparison of UF6 and NaF reaction kinetics and, selecting the shape and dimension requires the study of the effects of loading and pressure drop. In this paper, effects of adsorbents shape on pressure drop and capacity is studied. Based on these studies, it was realized that as the dimension of adsorbents decreases, the active surface area increases and cansequently, the final capacity of the adsorption decreases.

Highlights

  1. 1.    R.M. Schultz, W.E. Hobbs, J.L. Norton, M.J. Stephenson, “Sorbent selection and design consideration for uranium trapping,” K/ET-5025 (1981).

 

  1. 2.    M.J. Stephenson, “A design model for dynamic adsorption of uranium hexafluoride on fixed beds of sodium fluoride,” K-L-6195 (1968).

 

  1. 3.    L.E. McNeese, “An experimental study of sorption of uranium hexafluoride by sodium fluoride pellets and mathematical analysis of diffusion with simultaneous reaction,” ORNL-3494 (1983).

 

  1. 4.    L.E. Mc Neese and S.H. Jury, “Removal of uranium hexafluoride from gas streams by sodium fluoride pellets,” ORNL-1-281 (1964).

 

  1. 5.    W. Johnston, “Designing fixed-bed adsorption columns,” Chemical Eng. Nov. 27 (1972).                                                

 

  1. 6.    E.B. Munday, “Preconceptual design of the gas-phase decontamination demonstration cart,” K/TCD-1076 (1993).

 

  1. 7.    W. Umrath, “Fundumental of vacuum technology,” Leybold Vacuum Ind, Cologne (1998).
  2. 8.    L.N. Rozanov, “Vacuum technique,” 1st ed, Taylor & Francis, London (2002).

 

  1. 9.    F.E. Massoth and W.E. Hensel, “Kinetics of the reaction between sodium fluoride and uranium hexafluoride. Ι. sodium fluoride powder,” J. Physic. Chem. 62 (1958).

 

  1. 10.              F.E. Massoth and W.E. Hensel, “Kinetics of the reaction between sodium fluoride and uranium hexafluoride. ΙІ. sodium fluoride pellets and crushed pellets,” J. Physic. Chem. 63 (1959).

 

  1. 11.              J.G. Malm, H. Selig, S. Siegle, “Complex compounds of uranium hexafluoride with sodium fluoride and potassium fluoride,” J. Inorg. Nucl. Chem. 2, 380  (1956).

 

  1. 12.              H.G. Mcllvried and F.E. Massoth, “Effect of particle size distribution on gas-solid reaction kinetics for spherical particles,” Ind. Eng. Chem. Fund. Vol. 12, No 2 (1973).

 

  1. 13.              A.S. Gupta and G, Thodos, “Mass and heat transfer in the flow of fluids through fixed and fludized beds of spherical particles,” A.I. Ch.E. J, 8, 608 (1962).

Keywords

Sodium Fluoride
Uranium Hexafluoride
Chemical Trap
Absorber Pellets
Powder
Adsorption
Surface Area
Pressure drop
  1. 1.    R.M. Schultz, W.E. Hobbs, J.L. Norton, M.J. Stephenson, “Sorbent selection and design consideration for uranium trapping,” K/ET-5025 (1981).

 

  1. 2.    M.J. Stephenson, “A design model for dynamic adsorption of uranium hexafluoride on fixed beds of sodium fluoride,” K-L-6195 (1968).

 

  1. 3.    L.E. McNeese, “An experimental study of sorption of uranium hexafluoride by sodium fluoride pellets and mathematical analysis of diffusion with simultaneous reaction,” ORNL-3494 (1983).

 

  1. 4.    L.E. Mc Neese and S.H. Jury, “Removal of uranium hexafluoride from gas streams by sodium fluoride pellets,” ORNL-1-281 (1964).

 

  1. 5.    W. Johnston, “Designing fixed-bed adsorption columns,” Chemical Eng. Nov. 27 (1972).                                                

 

  1. 6.    E.B. Munday, “Preconceptual design of the gas-phase decontamination demonstration cart,” K/TCD-1076 (1993).

 

  1. 7.    W. Umrath, “Fundumental of vacuum technology,” Leybold Vacuum Ind, Cologne (1998).
  2. 8.    L.N. Rozanov, “Vacuum technique,” 1st ed, Taylor & Francis, London (2002).

 

  1. 9.    F.E. Massoth and W.E. Hensel, “Kinetics of the reaction between sodium fluoride and uranium hexafluoride. Ι. sodium fluoride powder,” J. Physic. Chem. 62 (1958).

 

  1. 10.              F.E. Massoth and W.E. Hensel, “Kinetics of the reaction between sodium fluoride and uranium hexafluoride. ΙІ. sodium fluoride pellets and crushed pellets,” J. Physic. Chem. 63 (1959).

 

  1. 11.              J.G. Malm, H. Selig, S. Siegle, “Complex compounds of uranium hexafluoride with sodium fluoride and potassium fluoride,” J. Inorg. Nucl. Chem. 2, 380  (1956).

 

  1. 12.              H.G. Mcllvried and F.E. Massoth, “Effect of particle size distribution on gas-solid reaction kinetics for spherical particles,” Ind. Eng. Chem. Fund. Vol. 12, No 2 (1973).

 

  1. 13.              A.S. Gupta and G, Thodos, “Mass and heat transfer in the flow of fluids through fixed and fludized beds of spherical particles,” A.I. Ch.E. J, 8, 608 (1962).

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