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Selective solvent extraction of Ca and Mg was applied to purify Ni from a concentrate sulfate solution ([Ni]=88g/L, [Mg]=3.1g/L, [Ca]=0.5g/L). In the first extraction circuit using D2EHPA as an extractant, 98.6% Ca were extracted (2 stages, [D2EHPA]=0.3M, pH3, 50°C, A/O ratio=1). The co-extracted Ni (~2.8%) was selectively stripped out (99%) from the loaded organic phase with only 2.6% Ca using a...
Extraction of metals in columns is scarce despite the advantage of low solvent inventory and the feasibility of high throughputs. Fast extraction kinetics allow short residence times and thus small apparatus height. A simulation of column concentration profiles via droplet population balances is less sophisticated as with surface active ion exchangers droplet breakage dominates and coalescence is...
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