Mathematical Modeling of Silver Extraction by an Emulsion Liquid Membrane Process

摘要

A general physical model of a typical batch extraction system employing an emulsion liquid membrane process is developed for the extraction of silver. The model takes into account the extraction reaction between the silver ion and the carrier molecule at the external interface, the diffusion of the complex in the membrane phase, the stripping reaction at the internal interface and the reaction of silver ion with reagent, HCl, in the internal phase to yield silver chloride incapable of permeating through the membrane phase. In addition, the leakage of the internal aqueous phase to the external aqueous phase due to membrane breakage is deliberated on in this model. The batch extraction of silver using D2EHPA as a carrier is carried out under various experimental conditions. The experimental data can be well explained by the present model.