Abstract

The current study focuses on the recovery of zinc ions by solvent extraction in the pulsed contactor. The Zn(II) ions from chloride solution were extracted into the organic phase containing di-(2-ethylhexyl) phosphoric acid (D2EHPA) extractant. The resulting data were characterized for the relative amount of (a) pulsed and no-pulsed condition; and (b) flow rate of both phases. Based on the mass balance equations for the column performance description, numerical computations of mass transfer in a disc-donut column were conducted and validated the experimental data for zinc extraction. Four different models, such as plug flow, backflow, axial dispersion, and forward mixing were evaluated in this study. The results showed that the intensification of the process with the pulsed condition increased and achieved higher mass transfer rates. The forward mixing model findings based on the curve fitting approach validated well with the experimental data. The results showed that an increase in pulsation intensity, as well as the phase flow rates, have a positive impact on the performance of the extractor. In contrast, the enhancement of flow rate led to the reduction of the described model parameters for the adverse phase.

Highlights

  • The current study focuses on the recovery of zinc ions by solvent extraction in the pulsed contactor

  • The variation in X-valve and Y-value errors with average absolute relative error (AARE) are presented in Table 3, which indicates that the pulsed disc-donut column is more consistent with the forward mixing model (10.74% for X-value, 13.28% for Y-value)

  • The extraction of zinc ions from the aqueous to the organic solution was investigated as a standard reaction system in the pulsed disc-donut column

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Summary

Introduction

The current study focuses on the recovery of zinc ions by solvent extraction in the pulsed contactor. The assumptions of this model are pure plug flow with axial mixing, a diffusion process with the constant diffuBoundary Conditions at top of column (z = 0) sion coefficients of ­Ec and ­Ed, equal values for diameter, velocity, residence time and mass transfer rate of droplets, no breakage and coalescence of drops dX dZ

Results
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