Puvvada, G V K and Jana, R K and Pandey, B D and Bagchi, D and Kumar, Vinay and Premchand, (1997) Ammonia leach and solvent extraction for the recovery of valuable metals from roast-reduced polymetallic ocean nodules. In: 2nd ISOPE Ocean Mining Symposium, Nov 24-25, 1997, Seoul, South Korea.
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The ammonia-ammonium carbonate leaching of roast-reduced polymetallic nodules analysing 1.175% copper, 1.625% nickel and 0.116% cobalt was carried out in lock cycle mode. The steady state composition was analysing 2.40 g/L copper, 3.41 g/L nickel and 0.163 g/L cobalt with leach recoveries of 93.95%, 96.53% and 64.65%, respectively. The iron and manganese contents of the steady state leach liquor were found to be 0.002 g/L and 0.008 g/L, respectively. The leach liquor was subjected to solvent extraction for the separation of copper, nickel and cobalt using LIX 84 in kerosene. It was observed that three stages were sufficient for co-extraction of copper and nickel leaving cobalt in the raffinate. The loaded organic phase after ammonia scrubbing was selectively stripped with spent electrolytes of nickel and copper and subsequently electrowon to produce copper and nickel of 99.94% and 99.8% purity, respectively. Cobalt was recovered as cobalt cake from the raffinate by ammonia stripping. The overall leach-solvent extraction recoveries obtained for copper, nickel and cobalt are found to be 93.9%, 94.23% and 62.50%, respectively.
|Item Type:||Conference or Workshop Item (Paper)|
|Uncontrolled Keywords:||Leaching; lock cycle; solvent extraction; electrowinning; recoveries|
|Divisions:||Metal Extraction and Forming|
|Deposited By:||Sahu A K|
|Deposited On:||16 Jun 2010 09:33|
|Last Modified:||16 Jun 2010 09:33|
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