Separation and recovery of heavy metals in chloride complexing solutions based on principles of electrochemical engineering

Christos Comninellis
1998
Conference paper

This paper describes the selective recovery of heavy metals from a chloride contg. soln. The goal is to recover each heavy metal with high purity and yield by electrodeposition. The soln. contains four different heavy metals (Zn, Pb, Cu and Cd), high amts. of NaCl and KCl and the pH is low (.apprx.0.7). Polarisation curves show that the sepn. of the 4 metals present in the synthetic soln. is in principle possible by electrodeposition at a fixed cathode potential. The sepn. of Cu and Pb from the other heavy metals have been studied in more details using rotating disc electrodes and electrodeposition at const. potential. The obtained results show that Cu and Pb can be electrodeposited in a high purity from the reaction medium. [on SciFinder (R)]

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Christos Comninellis
1998
Conference paper

Abstract

Official source

https://infoscience.epfl.ch/record/79822?ln=en

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Related concepts (6)

Heavy metals

Heavy metals are generally defined as metals with relatively high densities, atomic weights, or atomic numbers. The criteria used, and whether metalloids are included, vary depending on the author and context. In metallurgy, for example, a heavy metal may be defined on the basis of density, whereas in physics the distinguishing criterion might be atomic number, while a chemist would likely be more concerned with chemical behaviour. More specific definitions have been published, none of which have been widely accepted.

Electrochemical engineering

Electrochemical engineering is the branch of chemical engineering dealing with the technological applications of electrochemical phenomena, such as electrosynthesis of chemicals, electrowinning and refining of metals, flow batteries and fuel cells, surface modification by electrodeposition, electrochemical separations and corrosion.

Potential

Potential generally refers to a currently unrealized ability. The term is used in a wide variety of fields, from physics to the social sciences to indicate things that are in a state where they are able to change in ways ranging from the simple release of energy by objects to the realization of abilities in people. The philosopher Aristotle incorporated this concept into his theory of potentiality and actuality, a pair of closely connected principles which he used to analyze motion, causality, ethics, and physiology in his Physics, Metaphysics, Nicomachean Ethics, and De Anima, which is about the human psyche.