Leaching manganese nodules with iron-reducing agents – A critical review

2021 ◽  
Vol 163 ◽  
pp. 106748
Author(s):  
Norman Toro ◽  
Freddy Rodríguez ◽  
Anyelo Rojas ◽  
Pedro Robles ◽  
Yousef Ghorbani
Keyword(s):  
Critical Review ◽  
Reducing Agents ◽  
Manganese Nodules

scholarly journals Leaching Manganese Nodules in an Acid Medium and Room Temperature Comparing the Use of Different Fe Reducing Agents

Metals ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 1316 ◽  
Author(s):  
David Torres ◽  
Luís Ayala ◽  
Manuel Saldaña ◽  
Manuel Cánovas ◽  
Ricardo I. Jeldres ◽  
...  
Keyword(s):  
Acid Medium ◽  
Room Temperature ◽  
Good Alternative ◽  
Reducing Agents ◽  
Reducing Agent ◽  
High Grade ◽  
Manganese Nodules ◽  
Anova Analysis ◽  
Alternative Source ◽  
Independent Variables

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+, Fe0 and Fe2O3). Tests were also carried out for the different reducing agents evaluating the MnO2/Fe ratio, in which the Fe0 (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.

scholarly journals Correction: Torres, D. et al. Leaching Manganese Nodules in an Acid Medium and Room Temperature Comparing the Use of Different Fe Reducing Agents. Metals 2019, 9, 1316

Metals ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 506
Author(s):  
David Torres ◽  
Luís Ayala ◽  
Manuel Saldaña ◽  
Manuel Cánovas ◽  
Ricardo I. Jeldres ◽  
...  
Keyword(s):  
Acid Medium ◽  
Room Temperature ◽  
Reducing Agents ◽  
Manganese Nodules

The authors wish to make the following corrections to this paper [...]

RECENT DEVELOPMENTS IN PROCESSING OCEAN MANGANESE NODULES—A CRITICAL REVIEW

2004 ◽  
Vol 25 (2) ◽  
pp. 91-127 ◽  
Author(s):  
Amitava Mukherjee ◽  
Ashok M. Raichur ◽  
K. A. Natarajan ◽  
JAYANT M. MODAK
Keyword(s):  
Critical Review ◽  
Manganese Nodules ◽  
Recent Developments

Semi-synthesis as a tool for broadening the health applications of bioactive olive secoiridoids: a critical review

2021 ◽  
Author(s):  
Manuela Oliverio ◽  
Monica Nardi ◽  
Maria Luisa Di Gioia ◽  
Paola Costanzo ◽  
Sonia Bonacci ◽  
...  
Keyword(s):  
Critical Review ◽  
Natural Compounds ◽  
Effective Strategy ◽  
Synthetic Analogues ◽  
Health Applications ◽  
Natural And Synthetic

Semi-synthesis is an effective strategy to obtain both natural and synthetic analogues of the olive secoiridoids, starting from easy accessible natural compounds.

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