Leaching manganese nodules in an acid medium and room temperature comparing the use of different fe reducing agents

David Torres; Luís Ayala; Manuel Saldaña; Manuel Cánovas; Steven Nieto; Jonathan Castillo; Pedro Robles; Norman Toro

doi:10.3390/met9121316

Leaching manganese nodules in an acid medium and room temperature comparing the use of different fe reducing agents

David Torres, Luís Ayala, Manuel Saldaña, Manuel Cánovas, Steven Nieto, Jonathan Castillo, Pedro Robles, Norman Toro

SCHOOL OF CHEMICAL ENGINEERING

Research output: Contribution to journal › Article › peer-review

19 Scopus citations

Abstract

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.

Original language	English
Article number	1316
Journal	Metals
Volume	9
Issue number	12
DOIs	https://doi.org/10.3390/met9121316
State	Published - Dec 2019

Keywords

ANOVA
Acid media
Dissolution
MnO

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.3390/met9121316

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title = "Leaching manganese nodules in an acid medium and room temperature comparing the use of different fe reducing agents",

abstract = "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.",

keywords = "ANOVA, Acid media, Dissolution, MnO",

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year = "2019",

month = dec,

doi = "10.3390/met9121316",

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T1 - Leaching manganese nodules in an acid medium and room temperature comparing the use of different fe reducing agents

AU - Torres, David

AU - Ayala, Luís

AU - Saldaña, Manuel

AU - Cánovas, Manuel

AU - Nieto, Steven

AU - Castillo, Jonathan

AU - Robles, Pedro

AU - Toro, Norman

PY - 2019/12

Y1 - 2019/12

N2 - 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.

AB - 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.

KW - ANOVA

KW - Acid media

KW - Dissolution

KW - MnO

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U2 - 10.3390/met9121316

DO - 10.3390/met9121316

M3 - Article

AN - SCOPUS:85076592031

SN - 2075-4701

VL - 9

JO - Metals

JF - Metals

IS - 12

M1 - 1316

ER -

Leaching manganese nodules in an acid medium and room temperature comparing the use of different fe reducing agents

Abstract

Keywords

UN SDGs

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