Leaching Manganese Nodules in an Acid Medium and Room Temperature Comparing the Use of Different Fe Reducing Agents
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AuthorTorres, David; Ayala, Luis; Saldaña, Manuel; Canovas, Manuel; Jeldres Valenzuela, Ricardo Iván; [et al.]
Knowledge AreaCiencia de los Materiales e Ingeniería Metalúrgica
SponsorsThe authors are grateful for the contribution of the Scientific Equipment Unit- MAINI of the Universidad Católica del Norte for aiding in generating data by automated electronic microscopy QEMSCAN®and for facilitating the chemical analysis of the solutions. We are also grateful to the Altonorte Mining Company for supporting this research and providing slag for this study, and we thank to Marina Vargas Aleuy of the Universidad Católica del Norte for supporting the experimental tests. Pedro Robles thanks the Pontificia Universidad Católica de Valparaíso for the support provided.
Realizado en/conUniversidad Católica del Norte; Universidad Arturo Pratt; Universidad de Antofagasta; Universidad de Atacama; Pontificia Universidad Católica de Valparaíso
Bibliographic CitationTorres D, Ayala L, Saldaña M, Cánovas M, Jeldres RI, Nieto S, Castillo J, Robles P, Toro N. Leaching Manganese Nodules in an Acid Medium and Room Temperature Comparing the Use of Different Fe Reducing Agents. Metals. 2019; 9(12):1316. https://doi.org/10.3390/met9121316
The deposits of Fe-Mn, in the seabed of the planet, are a good alternative source for the extraction of elements of interest. Among these are marine nodules, which have approximately 24% manganese and may be a solution to the shortage of high-grade ores on the surface. In this investigation, an ANOVA analysis was performed to evaluate the time independent variables and MnO2/reducing agent in the leaching of manganese nodules with the use of different Fe reducing agents (FeS2, Fe2+, Fe-0 and Fe2O3). Tests were also carried out for the different reducing agents evaluating the MnO2/Fe ratio, in which the Fe-0 (FeC) proved to be the best reducing agent for the dissolution of Mn from marine nodules, achieving solutions of 97% in 20 min. In addition, it was discovered that at low MnO2/Fe ratios the acid concentration in the system is not very relevant and the potential and pH were in ranges of -0.4-1.4 V and -2-0.1 favoring the dissolution of Mn from MnO2.
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