A new facile solvometallurgical leaching method for the selective Co dissolution & recovery from hard metals waste

Abstract

Hard Metals (HM) production plays a fundamental role in economy and technological development. Due to the criticality of its main raw materials, W and Co, a sustainable HM waste recycling is hence desirable for both environmental and economic reasons and strongly encouraged by European waste management directives. This work describes a new solvometallurgical leaching method based on diluted maleic acid (H2Mal) ethanolic solutions, which demonstrated to couple effectiveness in materials enhancement from HM waste, with mildness and sustainability of operative conditions. Specifically, H2Mal (0.5 M, EtOH) selectively and quantitatively leached Co trapped within WC-Co powders, to afford [Co(HMal)2(H2O)4] complex within 4 h at room temperature and leaving WC unreacted and ready for re-employment in HM manufacturing. Characterization of the resultant materials i.e. treated powders (SEM-EDS, p-XRD, ICP-OES) and Co-leaching solutions (ICP-OES), confirmed the near quantitative Co removal as well as the possibility to finely tune the composition of WC-Co mixtures. Parameters for best leaching conditions, i.e. time and liquid-to-solid ratio, were obtained. A scale-up experiment addressed to test the leaching conditions and the quality of the recycled material is also described. The quality of the recycled material for direct re-employment in HM manufacturing was validated by Metallurgical Quality Control, to good effect. Finally, preliminary experiments on cobalt metal recovery from the metal complex by electrowinning and by quantitative precipitation as CoCO3 were performed with encouraging results: a step forward resources circularity.

Metadata

Item Type:	Article
Authors/Creators:	Oumarou Amadou, Amadou De Gaudenzi, Gian Pietro Marcheselli, Giancarlo Cara, Stefano Piredda, Martina Spiga, Daniela Matharu, Avtar S. https://orcid.org/0000-0002-9488-565X De Gioannis, Giorgia Serpe, Angela
Copyright, Publisher and Additional Information:	Funding Information: This work was supported by the Italian Ministry of University and Research [Dottorati innovativi con caratterizzazione industriale - PON R&I 2014-2020, scholarship N. DOT1304527-3 ] and ERASMUS+ Placedoc 2018-19 action [AOA's felloship]; the Italian Ministry for the Environment, Land and Sea Protection [CoW_aste project, 2019]; Fondazione di Sardegna [“Precious metal-free complexes for catalytic CO 2 reduction” project, 2017]; the FILMS corp. [“The selective extraction of excess cobalt from the recovery powders of the ‘hard metal’ production process” project, 2018; “The selective extraction of excess cobalt from the powders produced by carbothermal regeneration of ‘hard metal’ scrap” project, 2019]. The authors gratefully acknowledge Prof. Luciano Marchiò, University of Parma, for the always fruitful scientific collaboration and his valued contribution in the single-crystal X-ray characterization of the [Co(HMal) 2 (H 2 O) 4 ] complex. Funding Information: This work was supported by the Italian Ministry of University and Research [Dottorati innovativi con caratterizzazione industriale - PON R&I 2014-2020, scholarship N. DOT1304527-3] and ERASMUS+ Placedoc 2018-19 action [AOA's felloship]; the Italian Ministry for the Environment, Land and Sea Protection [CoW_aste project, 2019]; Fondazione di Sardegna [?Precious metal-free complexes for catalytic CO2 reduction? project, 2017]; the FILMS corp. [?The selective extraction of excess cobalt from the recovery powders of the ?hard metal? production process? project, 2018; ?The selective extraction of excess cobalt from the powders produced by carbothermal regeneration of ?hard metal? scrap? project, 2019]. The authors gratefully acknowledge Prof. Luciano Marchi?, University of Parma, for the always fruitful scientific collaboration and his valued contribution in the single-crystal X-ray characterization of the [Co(HMal)2(H2O)4] complex. Publisher Copyright: © 2021 Elsevier Ltd
Keywords:	Carbides,Cobalt,Green chemistry,Maleic acid,Waste prevention
Dates:	Published: 1 August 2021 Published (online): 31 March 2021 Accepted: 26 March 2021
Institution:	The University of York
Academic Units:	The University of York > Faculty of Sciences (York) > Chemistry (York)
Depositing User:	Pure (York)
Date Deposited:	31 Aug 2021 14:30
Last Modified:	08 Feb 2025 00:42
Published Version:	https://doi.org/10.1016/j.ijrmhm.2021.105534
Status:	Published
Refereed:	Yes
Identification Number:	10.1016/j.ijrmhm.2021.105534
Related URLs:	http://www.scopus.com/inward/record.url?...
Open Archives Initiative ID (OAI ID):	oai:eprints.whiterose.ac.uk:177586

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A new facile solvometallurgical leaching method for the selective Co dissolution & recovery from hard metals waste

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