Extended validation of an expression to predict ORP and iron chemistry : application to complex solutions generated during the acidic leaching or bioleaching of PCBs

UBC Faculty Research and Publications

Extended validation of an expression to predict ORP and iron chemistry : application to complex solutions generated during the acidic leaching or bioleaching of PCBs Yue, Guikuan; Guezennec, Anne-Gwénaëlle; Asselin, Edouard

Abstract

The present work shows that the expression developed in our previous work to predict the redox potential of the quaternary H₂SO₄-Fe₂(SO₄)₃-FeSO₄-H₂O system can still be used to predict the redox potential of the Fe³⁺/Fe²⁺ couple in more complex acidic iron sulfate solutions generated during the acidic leaching and bioleaching of Printed Circuit Boards (PCBs). This expression can also be employed to determine the ferrous and ferric concentrations based on measured redox potential, temperature and total iron by AAS, especially in ferric or ferrousdominant solutions. This equation therefore provides an alternative to the traditional colorimetric or volumetric methods for ferric and ferrous determination. The applicability of this equation in acidic iron sulfate solutions containing cupric ions was also supported by the experimental results in the literature. It is also shown that the measured redox potential is highly useful to estimate and understand the iron chemistry of industrial leaching processes.

Item Metadata

Title	Extended validation of an expression to predict ORP and iron chemistry : application to complex solutions generated during the acidic leaching or bioleaching of PCBs
Creator	Yue, Guikuan; Guezennec, Anne-Gwénaëlle; Asselin, Edouard
Publisher	Elsevier
Date Issued	2016-09
Description	The present work shows that the expression developed in our previous work to predict the redox potential of the quaternary H₂SO₄-Fe₂(SO₄)₃-FeSO₄-H₂O system can still be used to predict the redox potential of the Fe³⁺/Fe²⁺ couple in more complex acidic iron sulfate solutions generated during the acidic leaching and bioleaching of Printed Circuit Boards (PCBs). This expression can also be employed to determine the ferrous and ferric concentrations based on measured redox potential, temperature and total iron by AAS, especially in ferric or ferrousdominant solutions. This equation therefore provides an alternative to the traditional colorimetric or volumetric methods for ferric and ferrous determination. The applicability of this equation in acidic iron sulfate solutions containing cupric ions was also supported by the experimental results in the literature. It is also shown that the measured redox potential is highly useful to estimate and understand the iron chemistry of industrial leaching processes.
Subject	redox potential; iron chemistry; copper; oxidation; ferric
Genre	Article; Postprint
Type	Text
Language	eng
Date Available	2021-06-16
Provider	Vancouver : University of British Columbia Library
Rights	Attribution-NonCommercial-NoDerivatives 4.0 International
DOI	10.14288/1.0398427
URI	http://hdl.handle.net/2429/78699
Affiliation	Applied Science, Faculty of; Non UBC; Materials Engineering, Department of
Citation	Guikuan Yue, Anne-Gwénaëlle Guezennec, Edouard Asselin. Extended validation of an expression to predict ORP and iron chemistry: Application to complex solutions generated during the acidic leaching or bioleaching of printed circuit boards. Hydrometallurgy, Volume 164, 2016, Pages 334-342, ISSN 0304-386X.
Publisher DOI	10.1016/j.hydromet.2016.06.027
Peer Review Status	Reviewed
Scholarly Level	Faculty; Researcher
Rights URI	http://creativecommons.org/licenses/by-nc-nd/4.0/
Aggregated Source Repository	DSpace

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