Manganese Extraction and Leaching Techniques
Summary
Manganese extraction has evolved to meet the rising demand for this critical element, used chiefly in steel alloys, lithium-ion batteries and other high-tech applications. Two principal pathways predominate: pyrometallurgical reduction in high-temperature furnaces and hydrometallurgical leaching in an aqueous medium. In pyrometallurgy manganese ores or nodules are subjected to carbothermic or metalised reduction, often generating ferromanganese or silicomanganese alloys. Innovations focus on minimising slag generation and energy consumption through zero-waste strategies and optimised flux compositions. Hydrometallurgical routes employ acid or alkali leaching with reducing agents such as organic acids, sucrose or iron salts, enabling selective dissolution of manganese oxides. Key steps include leaching kinetics control, impurity removal via precipitation and cementation, solvent extraction and ion-exchange separation. Roasting–leaching combinations extend to secondary resources, converting residues into water-soluble sulphates prior to acid leaching. Contemporary research addresses low-grade ores, marine polymetallic nodules and industrial wastes, aiming to close supply gaps and reduce environmental footprints. Rigorous kinetic modelling, including shrinking core descriptions and activation energy determination, underpins process optimisation. The global significance of these techniques lies in securing manganese supply chains, promoting resource efficiency and enabling sustainable metal recovery for the clean energy transition.
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Manganese Extraction and Leaching Techniques publication trend
The graph below shows the total number of articles in manganese extraction and leaching techniques across all publications each year (not limited to Nature Index journals).
Technical terms
Pyrometallurgy: High-temperature extraction process in which ores are reduced or smelted to produce metals or alloys.
Hydrometallurgy: Aqueous-phase extraction involving leaching, solution purification and metal recovery.
Leaching: Chemical dissolution of a target metal from ore or waste using acid, alkali or other solvents.
Reducing agent: Substance that donates electrons in a chemical reaction to convert higher-valent metal oxides to lower-valent or metallic forms.
Shrinking core model: Kinetic model describing solid-liquid reactions where an unreacted core shrinks over time, with rate-controlling steps such as diffusion or surface reactions.
Solvent extraction: Separation technique in which metal ions transfer from an aqueous phase to an organic solvent containing selective extractants.
Cementation: Recovery method whereby a more reactive metal precipitates ions of a less reactive metal from solution.
References
- “Zero-Waste”: A Sustainable Approach on Pyrometallurgical Processing of Manganese Nodule Slags. Minerals (2018).
- Hydrometallurgical Process and Kinetics of Leaching Manganese from Semi-Oxidized Manganese Ores with Sucrose. Minerals (2017).
- Extraction of Iron and Manganese from Pyrolusite Absorption Residue by Ammonium Sulphate Roasting–Leaching Process. Metals (2018).
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