Hara, YRS and Jha, A orcid.org/0000-0003-3150-5645 (2015) Energy efficient separation of magnetic alloy from the carbothermic reduction of NKANA Cu-Co concentrates. In: Jha, A, Wang, C, Neelameggham, NR, Guillen, DP, Li, L, Belt, CK, Kirchain, R, Spangenburger, JS, Johnson, F, Gomes, AJ, Pandey, A and Hosemann, P, (eds.) Energy Technology 2015: Carbon Dioxide Management and Other Technologies. TMS 2015 144th Annual Meeting & Exhibition, 15-19 Mar 2015, Orlando, Fla., U.S.A.. Springer , pp. 83-92. ISBN 978-3-319-48602-4
Abstract
The Nkana Cu-Co mineral sulphide concentrates containing 40 wt.% SiO₂ were carbothermically reduced in the presence of CaO by following the equilibrium: MS + CaO + C = M + CaS + CO(g), where M represents the metallic Cu, Co and Fe, over a temperature range of 1073 K – 1323 K. We investigated the magnetic separation of alloy phases into copper-cobalt rich and iron-cobalt rich fractions. The proposed approach appears more energy efficient than melting a mixture which yields a ternary alloy composed of Cu, Co and Fe, and a non-magnetic fraction (CaS, excess CaO and SiO₂). The extent of magnetic separation was affected by the temperature and mole ratios of MS/CaO and C/CaO, used for the reduction of mineral concentrate. The reduced and magnetically separated samples were characterised by XRD, SEM-EDX and XRF techniques. The alloy phase contained ~92 wt% of metallic constituents, with remaining 8 wt.% as mixture of CaS and SiO₂. The utilisation of this gangue mixture in the process is briefly discussed.
Metadata
Item Type: | Proceedings Paper |
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Authors/Creators: |
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Editors: |
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Copyright, Publisher and Additional Information: | (c) 2015, TMS (The Minerals, Metals & Materials Society). This is an author produced version of a paper published in Energy Technology 2015: Carbon Dioxide Management and Other Technologies. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | Cobalt; Copper; Carbothermic reduction; Energy; Concentrates; Nkana; Mineral sulphides and separation |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Chemical & Process Engineering (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 08 Mar 2019 15:36 |
Last Modified: | 08 Mar 2019 15:40 |
Status: | Published |
Publisher: | Springer |
Identification Number: | 10.1007/978-3-319-48220-0_10 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:141156 |