Transactions of the Indian Institute of Metals

, Volume 71, Issue 12, pp 2971–2983 | Cite as

Reductive Leaching of Manganese Nodule Using Saw Dust in Sulphuric Acid Medium

  • D. Hariprasad
  • M. Mohapatra
  • S. Anand
Technical Paper


Single-step reductive dissolution studies were carried out to extract Mn, Cu, Ni and Co values from manganese nodules of Indian Ocean using a cellulosic low-cost reductant (sawdust) in sulphuric acid medium. The leaching conditions were optimized for maximum extractions by varying experimental parameters such as time, amount of reductant, sulphuric acid concentration, temperature, and pulp density. It was observed that both acid as well as reductant were essential to successfully dissolve most of the desired metal values. 99.5% Mn, 99.1% Cu, 99.6% Ni, 93% Co and 64.6% Fe were dissolved under the conditions: pulp density 10% (wt/v), amount of sawdust 0.5 g/g of nodule, acid 5% (v/v), temp 105 °C, time 2 h. The enriched leach liquor was obtained following lock cycle technique. The composition of solution taken for purification was: 98.2 g/L Mn, 4.1 g/L Cu, 5 g/L Ni, 336 ppm Co with 12.3 g/L Fe. Precipitated bulk sulphides of Cu, Ni, Co and crystallized MnSO4·H2O were the two products obtained after Fe removal from the solution. A schematic flow sheet was suggested. The complete process comprised of simple hydrometallurgical unit operations.


Mn nodules Leaching Sawdust Precipitation MnSO4·H2



The authors are thankful to Prof. B K Mishra, Director, Institute of Minerals and Materials Technology, Bhubaneswar, Odisha, India, for his kind permission to publish this paper. The authors are also thankful to Dr I.N. Bhattacharya, Head, Hydro-Electro Metallurgy Department. GAP-0001 One of the authors, D. Hariprasad, expresses his gratitude to CSIR, New Delhi, for providing financial support as senior research fellow.


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Copyright information

© The Indian Institute of Metals - IIM 2018

Authors and Affiliations

  1. 1.Hydro-Electro Metallurgy DepartmentInstitute of Minerals and Materials TechnologyBhubaneswarIndia

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