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Solvent extraction with LIX 973N for the selective separation of copper and nickel

✍ Scribed by Francisco José Alguacil; Antonio Cobo

Publisher
Wiley (John Wiley & Sons)
Year
1999
Tongue
English
Weight
76 KB
Volume
74
Category
Article
ISSN
0268-2575

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✦ Synopsis

LIX 973N diluted with Iber¯uid was used to co-extract copper and nickel from ammoniacal/ ammonium carbonate aqueous media. The in¯uence of equilibration time, temperature, equilibrium pH and extractant concentration on the extraction of both metals has been studied. It was observed that neither copper nor nickel extraction is sensitive to temperature and equilibrium pH, however nickel extraction equilibrium is reached at a longer contact time (20 min) than that of copper (5 min), in addition nickel extraction depends greatly on the extractant concentration in the organic phase. For a solution containing 3 g dm À3 each of copper and nickel and 60 g dm À3 ammonium carbonate, conditions were established for the co-extraction of both metals, ammonia scrubbing and selective stripping (with H 2 SO 4 ) of nickel and copper. Using the appropriate extractant concentration the yield (extraction stage) for both metals is near 100%, whereas the percentage of nickel and copper stripping is also almost quantitative.

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