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Leaching of Manganese from Marine Nodules at Room Temperature with the Use of Sulfuric Acid and the Addition of Tailings

1
Departamento de Ingeniería en Metalurgia y Minas, Universidad Católica del Norte, Antofagasta 1270709, Chile
2
Departamento de Ingeniería Industrial, Universidad Católica del Norte, Antofagasta 1270709, Chile
3
Departamento de Ingeniería en Metalurgia, Universidad de Atacama, Copiapó 1531772, Chile
4
Departamento de Educación, Universidad de Antofagasta, Antofagasta 1270300, Chile
*
Author to whom correspondence should be addressed.
Minerals 2019, 9(5), 289; https://doi.org/10.3390/min9050289
Received: 21 March 2019 / Revised: 8 May 2019 / Accepted: 9 May 2019 / Published: 11 May 2019
(This article belongs to the Special Issue Recent Advances in Hydro- and Biohydrometallurgy)
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Abstract

Based on the results obtained from a previous study investigating the dissolution of Mn from marine nodules with the use of sulfuric acid and foundry slag, a second series of experiments was carried out using tailings produced from slag flotation. The proposed approach takes advantage of the Fe present in magnetite contained in these tailings and is believed to be cost-efficient. The surface optimization methodology was used to evaluate the independent variables of time, particle size, and sulfuric acid concentration in the Mn solution. Other tests evaluated the effect of agitation speed and the MnO2/Fe2O3 ratio in an acid medium. The highest Mn extraction rate of 77% was obtained with an MnO2/Fe2O3 ratio of 1/2 concentration of 1 mol/L of H2SO4, particle size of −47 + 38 μm, and 40 min of leaching. It is concluded that higher rates of Mn extraction were obtained when tailings instead of slag were used, while future research needs to focus on determination of the optimum Fe2O3/MnO2 ratio to improve dissolution of Mn from marine nodules. View Full-Text
Keywords: secondary products; reducing agent; waste reuse; acid media secondary products; reducing agent; waste reuse; acid media
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Toro, N.; Saldaña, M.; Castillo, J.; Higuera, F.; Acosta, R. Leaching of Manganese from Marine Nodules at Room Temperature with the Use of Sulfuric Acid and the Addition of Tailings. Minerals 2019, 9, 289.

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