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Mining Engineering

Ahmad Ghahreman

Ahmad Ghahreman PhD, PEng

Assistant Professor

(613)533-3294, Goodwin 325
ahmad.g@queensu.ca

Hydrometallurgy and biohydrometallurgy, Mineral processing wastes and their remediation, Electrochemical dissolution of complex minerals (fundamental studies), Flowsheet design and modeling

For more information, visit www.hydrometallurgy.ca

Ahmad Ghahreman PhD, PEng

Biography

Ahmad has a Bachelor degree (2005) and a Master's degree (2007) in Materials Science and Engineering from Sharif University of Technology, Tehran, Iran, and earned his PhD in Materials Engineering from The University of British Columbia, Vancouver, BC (2012). Upon completing his PhD, Ahmad joined the Technology Centre of Barrick Gold Corp. in Vancouver, as an NSERC Industrial Research & Development (IRDF) Postdoctoral Fellow. He joined The Robert M. Buchan Department of Mining at Queen's University as an Assistant Professor in January 2014.

Research Interests

Ahmad's primary area of interest is hydrometallurgical processing of resource materials. While at Barrick, he was involved in development of new technologies for metals recovery (e.g. gold and copper) and immobilization of toxic species (e.g. arsenic and mercury). Ahmad's long-term research goals at Queen's University will focus on the extractive metallurgy and mineral processing aspects associated with the following research areas:

  • Hydrometallurgy and biohydrometallurgy: The key research activities in this area will be to advance the fundamental and technical understanding of the aqueous industrial processes and development of novel processes for sustainable and environmentally friendly hydrometallurgical treatment of resource materials. Some of the interesting topics in this area are: (a) thiosulphate and cyanide leaching of gold, (b) processing of sulphidic concentrates, such as enargite and chalcopyrite, (c) solvent extraction, ion exchange and electrowinning.
  • Mineral processing wastes and their remediation: Some mineral processing wastes may have irremediable impact on the environment, and solutions to these problems can be developed through well-designed university level research programs. Among the interesting topics in this area are arsenic and mercury immobilization.
  • Electrochemical dissolution of complex minerals (fundamental studies): The dissolution process of most sulphide minerals (e.g. chalcopyrite, pyrite, enargite, etc) is electrochemical in nature, and well-planned electrochemical studies appear to be the only way to reveal the underlying mechanism of the associated leaching reactions. Fundamental electrochemical studies enable us to understand the mechanisms of dissolution, passivation and catalysis and these are closely linked to successful process design.
  • Flowsheet design and modeling: Modeling of the processes is the preferred method for studying of the alternative process configurations. Models enable us to reveal some issues such as water balance or excess acid generation, which initially were not apparent. Generally, the research in this area will focus on the development of models for mineral processing operations.

Publications

Selected Referred Journal Publications

  • A. Ghahremaninezhad, D.G. Dixon, E. Asselin, "Electrochemical and XPS analysis of chalcopyrite (CuFeS2) dissolution in sulfuric acid solution", Electrochimica Acta 87 (2013) 97-112.
  • A. Ghahremaninezhad, D.G. Dixon, E. Asselin, "Kinetics of the ferric/ferrous couple on anodically passivated chalcopyrite (CuFeS2) electrodes", Hydrometallurgy 125-126 (2012) 42-49.
  • A. Ghahremaninezhad, W. Wand, E. Asselin, J. Budac, A. Alfantazi, "Corrosion of alloys 316L and 317L in chloridized ammonium sulfate solution at elevated temperature", Canadian Metallurgical Quarterly 51 (2012) 471-484.
  • A. Ghahremaninezhad, E. Asselin, D.G. Dixon, "Electrodeposition and Growth Mechanism of Copper Sulfide Nanowires", Journal of Physical Chemistry C 115 (2011) 9320-9334.
  • A. Ghahremaninezhad, E. Asselin, D.G. Dixon, "One-step template-free electrosynthesis of 300 μm long copper sulfide nanowires", Electrochemistry Communications 13 (2011) 12-15.
  • A. Ghahremaninezhad, E. Asselin, D.G. Dixon, "In Situ Electrochemical Analysis of Surface Layers on a Pyrrhotite Electrode in Hydrochloric Acid Solution", Journal of The Electrochemical Society 157 (2010) C248-C257.
  • A. Ghahremaninezhad, E. Asselin, D.G. Dixon, "Electrochemical evaluation of the surface of chalcopyrite during dissolution in sulfuric acid solution", Electrochimica Acta 55 (2010) 5041-5056.
  • A. Ghahremaninezhad, A. Dolati, "Diffusion-Controlled Growth Model for Electrodeposited Cobalt Nanowires in Highly Ordered Aluminum Oxide Membrane", ECS Transactions 28 (2010) 13-25.
  • K. Kareh, A. Ghahremaninezhad, E. Asselin, "Electrochemical properties of metallurgical-grade silicon in hydrochloric acid", Electrochimica Acta 54 (2009) 6548-6553.
  • A. Ghahremaninezhad, A. Dolati, "A study on electrochemical growth behavior of the Co-Ni alloy nanowires in anodic aluminum oxide template", Journal of Alloys and Compounds 480 (2009) 275-278.
  • A. Ghahremaninezhad, A. Dolati, M. Kazemeini, "Growth behavior of the electrodeposited Co-Ni alloy nanowires", International Journal of Modern Physics: Condensed Matter Physics, Statistical Physics 22 (2008) 3013-3022.

Selected Referred Conference Publications

  • A. Ghahremaninezhad, E. Asselin and D. Dixon, "Cathodic reactions on oxidized chalcopyrite electrode surface", Electrometallurgy 2012 - TMS Conference, Orlando, Florida, March, 2012.
  • A. Ghahremaninezhad, E. Asselin and D. Dixon, "An Electrochemical Model for Acidic Dissolution of Chalcopyrite (CuFeS2) Mineral", Copper 2010 - GDMB, Hamburg, Germany, June, 2010.
  • A. Ghahremaninezhad, E. Asselin and D. Dixon, "On the Dissolution Sequence of Pyrrhotite: In-Situ Electrochemical Analysis of Surface Layers", The 48th Annual Conference of Metallurgists, Proceedings of Ni-Co 2009 - The International Symposium, Sudbury, ON, Canada, August 21-26, 2009.

Selected Non-referred Conference Contributions

  • A. Ghahremaninezhad, "Active-passive Dissolution of Chalcopyrite (CuFeS2) in Sulfuric Acid Solutions"; Canadian Section Electrochemical Society Symposium, Calgary, AB, November 2011. (Award Lecture)
  • A. Ghahremaninezhad, E. Asselin and D. Dixon, "Passivation of Chalcopyrite in sulfuric acid solutions", 220th Electrochemical Society Meeting, Boston, MA, USA, October 2011 (Poster presentation).
  • A. Ghahremaninezhad, E. Asselin, J. Budac and A. Alfantazi, "SCC and pitting corrosion of stainless steel alloys 316L and 317L in chloridized ammonium sulfate solution", 219th Electrochemical Society Meeting, Montreal, QC, April 2011 (Oral presentation).
  • A. Ghahremaninezhad, E. Asselin and D. Dixon, "Copper sulfide nanowires electrodeposition; method and mechanism", 219th Electrochemical Society Meeting, Montreal, QC, April 2011 (Oral presentation).
  • A. Ghahremaninezhad, E. Asselin and D. Dixon, "Characterization of electrochemical processes at the carbon paste chalcopyrite electrode Interface in sulfuric acid solutions", 219th Electrochemical Society Meeting, Montreal, QC, April 2011 (Oral presentation).
  • A. Ghahremaninezhad, E. Asselin and D. Dixon, "EIS study on the corrosion behavior of CuFeS2 thin film", 217th Electrochemical Society Meeting, Vancouver, BC, April 2010 (Oral presentation).