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IWA Publishing, Water Science and Technology

DOI: 10.2166/wst.2016.007

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Chemical fractionation and speciation modelling for optimization of ion-exchange processes to recover palladium from industrial wastewater

Journal article published in 2016 by K. Folens ORCID, S. Van Hulle, F. Vanhaecke, G. Du Laing ORCID
This paper was not found in any repository, but could be made available legally by the author.
This paper was not found in any repository, but could be made available legally by the author.

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Abstract

Palladium is used in several industrial applications and given its high intrinsic value, intense efforts are made to recover the element. In this hydrometallurgic perspective, ion-exchange technologies are principal means. Yet, without incorporating the chemical and physical properties of the Pd present in real, plant-specific conditions, the recovery cannot reach its technical nor economic optimum. This study characterized a relevant Pd-containing waste stream of a mirror manufacturer to provide input for a speciation model, predicting the Pd speciation as a function of pH and chloride concentration. Besides the administered neutral PdCl2 form, both positively and negatively charged [PdCln]2-n species occur depending on the chloride concentration in solution. Purolite C100 and Relite 2AS ion-exchange resins were selected and applied in combination with other treatment steps to optimize the Pd recovery. A combination of the cation and anion exchange resins was found successful to quantitatively recover Pd. Given the fact that Pd was also primarily associated with particles, lab-scale experiments focused on physical removal of the Pd-containing flow were conducted, which showed that particle-bound Pd can already be removed by physical pre-treatment prior to ion-exchange, while the ionic fraction remains fully susceptible to the ion-exchange mechanism.