Application of the Pulse Column for Uranium Recovery From K-25 Wastes

Lieberman, Elias; Jealous, A.C.

doi:10.2172/4177304

Cited by 6 publications

(1 citation statement)

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“…Hydrometallurgical, nuclear, and chemical industries extensively employ liquid–liquid extraction as a separation process. − Various liquid–liquid contactors such as mixer-settler, rotating disc contactors, centrifugal extractor, and air pulsed columns are used for liquid–liquid extraction. Among these contactors, air pulsed columns are suitable for applications involving nuclear materials as they do not have moving parts and thus are maintenance-free. − Air pulsing is used to provide the energy to create liquid–liquid dispersion in a pulsed column. There are several designs of air pulsed columns which basically differ in the type of internals used.…”

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confidence: 99%

CFD Modeling of Pulsed Disc and Doughnut Column: Prediction of Axial Dispersion in Pulsatile Liquid–Liquid Two-Phase Flow

Sarkar

Singh

Shenoy

2019

Ind. Eng. Chem. Res.

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Numerical simulations of liquid−liquid counter-current two-phase flow in pulsed disc and doughnut columns (PDDCs) are performed. The simulation methodology comprises two steps. In the first step, the Euler−Euler method is used to obtain turbulent two-phase flow field. Turbulence is simulated by using standard k-ε mixture model. The dispersed phase is assumed to be monodispersed. The second step comprises solution of species transport equation together with flow equations to obtain residence time distribution (RTD) of the continuous phase. The RTD is used to estimate the axial dispersion coefficient or Peclet number of the continuous phase. Experimental data of RTD for different operating conditions (pulsing velocity, dispersed phase velocity, continuous phase velocity) and different geometries (diameter of the column, spacing between the discs) are used for validation. Estimates of the Peclet number by the CFD model are better than the same obtained from previously reported empirical correlations.

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