Research Article

Preliminary Study on the Reductive Leaching of Manganese Ores using FeSO?/Iron Powder as Reducing Agents under Room Temperature

Kofi Moro
TU Bergakademie Freiberg, Germany
* Corresponding author
Frank Haubrich
G.E.O.S. Ingenieurgesellschaft mbH Freiberg, Germany
Mirko Martin
G.E.O.S. Ingenieurgesellschaft mbH Freiberg, Germany
DOI icon 10.24018/ejeng.2021.6.6.2572

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Submitted 2021-08-25
Published 2021-09-15

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Article Main Content

The leaching of manganese (Mn) ore in sulphuric acid (H2SO4) under reductive conditions has been studied. The effects of leaching parameters such as ore/reductant mass ratio, acid concentration, ore particle size, solid/liquid ratio, leaching time and different reductant potential on the maximum recovery of manganese have been investigated. The optimal leaching conditions were ore/reductant mass ratio of 1:3.4, acid concentration of 10% v/v H2SO4, ore particle size of 63-200 µm, particle size of iron powder of –150 µm, solid/liquid ratio of 1:20, and leaching time of 1.5 hours at room temperature. A comparative analysis on the recovery of manganese ore was also investigated under the optimal leaching conditions for two different reductants, iron sulphate (FeSO4) and iron powder. The maximum manganese recoveries at the optimal leaching conditions in the presence of FeSO4 and iron powder are 80.6% and 95%, respectively. The results indicate that manganese can readily be leached during short time at room temperature. Furthermore, iron powder has a stronger reducing power compared to FeSO4 with respect to manganese ore recovery.

Keywords: Iron powder Iron sulphate Manganese ore Reductive leaching Sulphuric acid

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