Recovery of valuable metals from sea nodules through reduction-roasting ammonia leaching process

Smita, K and Srivastava, R R and Mishra, D and Sahu, K K and Singh, T B and Agrawal, A and Jana, R K (2010) Recovery of valuable metals from sea nodules through reduction-roasting ammonia leaching process. In: Proceedings of the XI International Seminar on Mineral Processing Technology (MPT-2010), Dec 2010, NML Jamshedpur, India.

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Polymetallic Sea Nodules are considered to be futuristic sources of several valuable metals like Cu, Ni, Co, Mn. etc. Since last two decades or more, NML is involved in developing a process flow-sheet for extracting these valuable metals from Sea Nodules through pyro-hydrometallurgical routes. The process developed at NML comprised of reduction roasting of Sea Nodules with Low Diesel (LD) oil followed by ammoniacal leaching, SX and EW for recovering Cu, Ni and Co; and electro-thermal smelting of leaching residue for recovering Mn as standard grade Fe-Si-Mn. This process was demonstrated on pilot scale (100 kg/day) with satisfactory metal recoveries (Cu and Ni >90%, Co 75% and Mn 70%). Recently, NML also explored a similar process route for recovering the metals from Sea Nodules with use of coal as the reductant instead of LD oil, in view of better process economy. The present paper describes the evolution of this alternate sea nodule processing route at various scales, starting from 50g to 10 Kg/batch scale. Detail results on optimization of roasting and leaching parameters at bench scale are discussed, while some important results from large scale trials are presented.

Item Type:Conference or Workshop Item (Paper)
Official URL/DOI:
Uncontrolled Keywords:Sea Nodules, Reduction roasting, Ammoniacal leaching, LD oil.
Divisions:Metal Extraction and Forming
ID Code:2498
Deposited By:Dr. A K Sahu
Deposited On:11 Feb 2011 10:31
Last Modified:19 Aug 2015 16:43
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