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

Minerals

Roxana Acosta¹  Manuel Saldaña²  Freddy Higuera²  Norman Toro³  Jonathan Castillo⁴ 

[1] Departamento de Educación, Universidad de Antofagasta, Antofagasta 1270300, Chile;Departamento de Ingeniería Industrial, Universidad Católica del Norte, Antofagasta 1270709, Chile;Departamento de Ingeniería en Metalurgia y Minas, Universidad Católica del Norte, Antofagasta 1270709, Chile;Departamento de Ingeniería en Metalurgia, Universidad de Atacama, Copiapó 1531772, Chile;

关键词: secondary products;    reducing agent;    waste reuse;    acid media;   

DOI  :  10.3390/min9050289

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown