A Thermodynamic Study of the Reduction of a Limonitic Laterite Ore by Methane

The recovery of nickel from the oxidic nickeliferous laterite ores is receiving increasing attention due to the difficulty of recovering this metal from the sulphide ore deposits. One possible solution is to selectively reduce the nickel oxide in the ore, which could then be upgraded by, for example...

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Bibliographic Details
Published in:High temperature materials and processes 2018-11, Vol.37 (9), p.909-919
Main Authors: Pickles, C. A., Anthony, W.
Format: Article
Language:English
Subjects:
Carbon dioxide
Environmental impact
laterite
limonitic
Methane
Mineral deposits
Minerals
modelling
nickel
Nickel oxides
nickeliferous
Recovery
Reducing agents
Reduction
thermodynamics
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Summary:The recovery of nickel from the oxidic nickeliferous laterite ores is receiving increasing attention due to the difficulty of recovering this metal from the sulphide ore deposits. One possible solution is to selectively reduce the nickel oxide in the ore, which could then be upgraded by, for example, magnetic concentration. In this article, a thermodynamic study was performed on the reduction of a limonitic laterite ore by methane. Methane was selected as the reducing agent as it has a lower environmental impact than carbon due to the reduced carbon dioxide emissions. The effects of temperatures and methane additions on the nickel recovery and nickel grade were investigated. High recoveries of over 95 % were predicted, but the grades were limited to about 2.5 % due to the formation of magnetite. The thermodynamic simulations for reduction by methane were in agreement with the experimental results in the literature for other reducing agents, reflecting the fact that the nickel oxide in the limonitic ore is relatively unstable. Thus, high recoveries could be achieved irrespective of the reducing agent involved.
ISSN:0334-6455
2191-0324
DOI:10.1515/htmp-2017-0106