E-ISSN 2063-5346
 

Research Article 


ELECTRO-REDUCTIVE LEACHING OF LOW-GRADE MANGANESE OXIDE RAW MATERIALS USING AN Fe3+/Fe2+ REDOX MEDIATOR

Tinatin Lezhava, Gigla Tsurtsumia, Jemal Shengelia, Nana Koiava, David Gogoli, Levan Beriashvili, Giorgi Gorelishvili.

Abstract
Electro-reductive leaching of 18.1% Mn residues (tailings) generated after enrichment of raw manganese oxide ore deposits from the Chiatura region in Georgia was conducted in a non-diaphragm electrolyzer using an Fe3+/Fe2+ redox system as a mediator in a suspension with a limited concentration of Fe3+ (up to 3.5 g∙L−1).
For regeneration of the Fe2+ reductant agent, the enhanced surface of an AISI 304 stainless steel mesh-cathode was chosen, which unlike the graphite felt electrodes (GFE-1) did not become clogged with solid silicates and sand particles. The apparatus, which was designed to ensure electro-leaching efficiency, consisted of a non-diaphragm electrolyzer with an intermediate tank, a peristaltic pump, and a compressor. The optimal conditions for the electro-reductive leaching process using a mesh cathode were as follows: i) a relatively low concentration of acid (16–20 g∙L−1 H2SO4 + 2.0 –2.5 g∙L−1 Fe3+; pH of 1), a liquid/solid ratio in the suspension of 0.08 kg/L, ii) taking into account the overall surface of the cathode, the current density ic=0.6A/dm2; A∙dm−2, and iii) intensive turbulence (boiling) of the suspension. Under these conditions, the Mn extraction rate was 96.0–98.1% and the current efficiency was 84.2–86.6%, while only 20–25% of the iron from raw material was transferred to the solution and its content did not exceed the limited concentration of 3.5 g∙L−1 Fe3+.
Large-scale laboratory testing of electro-reductive leaching showed that the total specific electricity consumption for raw material processing was 3760.8 kWh∙t−1, and for electro-reductive leaching, the value was 586.8 kWh∙t−1. After electro-leaching, filtration, and drying, light brown solid stuff was obtained, which could be used for cement production as an additive.

Key words: Low-grade manganese oxide raw materials; electro-reductive leaching; redox system Fe3+/Fe2+; leaching efficiency, current efficiency


 
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How to Cite this Article
Pubmed Style

TL, Tsurtsumia G, Shengelia J, Koiava N, Gogoli D, Beriashvili L, Gorelishvili G. ELECTRO-REDUCTIVE LEACHING OF LOW-GRADE MANGANESE OXIDE RAW MATERIALS USING AN Fe3+/Fe2+ REDOX MEDIATOR. ECB. 2022; 11(10): 50-61. doi:10.31838/ecb/2022.11.10.008


Web Style

TL, Tsurtsumia G, Shengelia J, Koiava N, Gogoli D, Beriashvili L, Gorelishvili G. ELECTRO-REDUCTIVE LEACHING OF LOW-GRADE MANGANESE OXIDE RAW MATERIALS USING AN Fe3+/Fe2+ REDOX MEDIATOR. https://www.eurchembull.com/?mno=108101 [Access: November 29, 2022]. doi:10.31838/ecb/2022.11.10.008


AMA (American Medical Association) Style

TL, Tsurtsumia G, Shengelia J, Koiava N, Gogoli D, Beriashvili L, Gorelishvili G. ELECTRO-REDUCTIVE LEACHING OF LOW-GRADE MANGANESE OXIDE RAW MATERIALS USING AN Fe3+/Fe2+ REDOX MEDIATOR. ECB. 2022; 11(10): 50-61. doi:10.31838/ecb/2022.11.10.008



Vancouver/ICMJE Style

TL, Tsurtsumia G, Shengelia J, Koiava N, Gogoli D, Beriashvili L, Gorelishvili G. ELECTRO-REDUCTIVE LEACHING OF LOW-GRADE MANGANESE OXIDE RAW MATERIALS USING AN Fe3+/Fe2+ REDOX MEDIATOR. ECB. (2022), [cited November 29, 2022]; 11(10): 50-61. doi:10.31838/ecb/2022.11.10.008



Harvard Style

, T. L., Tsurtsumia, . G., Shengelia, . J., Koiava, . N., Gogoli, . D., Beriashvili, . L. & Gorelishvili, . G. (2022) ELECTRO-REDUCTIVE LEACHING OF LOW-GRADE MANGANESE OXIDE RAW MATERIALS USING AN Fe3+/Fe2+ REDOX MEDIATOR. ECB, 11 (10), 50-61. doi:10.31838/ecb/2022.11.10.008



Turabian Style

, Tinatin Lezhava, Gigla Tsurtsumia, Jemal Shengelia, Nana Koiava, David Gogoli, Levan Beriashvili, and Giorgi Gorelishvili. 2022. ELECTRO-REDUCTIVE LEACHING OF LOW-GRADE MANGANESE OXIDE RAW MATERIALS USING AN Fe3+/Fe2+ REDOX MEDIATOR. European Chemical Bulletin, 11 (10), 50-61. doi:10.31838/ecb/2022.11.10.008



Chicago Style

, Tinatin Lezhava, Gigla Tsurtsumia, Jemal Shengelia, Nana Koiava, David Gogoli, Levan Beriashvili, and Giorgi Gorelishvili. "ELECTRO-REDUCTIVE LEACHING OF LOW-GRADE MANGANESE OXIDE RAW MATERIALS USING AN Fe3+/Fe2+ REDOX MEDIATOR." European Chemical Bulletin 11 (2022), 50-61. doi:10.31838/ecb/2022.11.10.008



MLA (The Modern Language Association) Style

, Tinatin Lezhava, Gigla Tsurtsumia, Jemal Shengelia, Nana Koiava, David Gogoli, Levan Beriashvili, and Giorgi Gorelishvili. "ELECTRO-REDUCTIVE LEACHING OF LOW-GRADE MANGANESE OXIDE RAW MATERIALS USING AN Fe3+/Fe2+ REDOX MEDIATOR." European Chemical Bulletin 11.10 (2022), 50-61. Print. doi:10.31838/ecb/2022.11.10.008



APA (American Psychological Association) Style

, T. L., Tsurtsumia, . G., Shengelia, . J., Koiava, . N., Gogoli, . D., Beriashvili, . L. & Gorelishvili, . G. (2022) ELECTRO-REDUCTIVE LEACHING OF LOW-GRADE MANGANESE OXIDE RAW MATERIALS USING AN Fe3+/Fe2+ REDOX MEDIATOR. European Chemical Bulletin, 11 (10), 50-61. doi:10.31838/ecb/2022.11.10.008