Abstract
Studies on the separation of nickel from concentrated solutions containing sodium sulphate were carried out with di(2-ethylhexyl) phosphoric acid diluted with kerosene (mostly aliphatic). Increase in extractant concentration, extent of neutralisation and organic to aqueous phase ratio increase the extraction of nickel. The plot of log D vs. log [extractant] is linear with a slope of 2.3, indicating that the extracted species is probably NiA 2. Employing 0.4 M D2EHPA, nickel was extracted to the extent of 99.6% in three counter-current stages at an aqueous to organic phase ratio of 1:4. Nickel was stripped using the spent electrolyte from the loaded organic phase in three counter-current stages at an aqueous to organic phase ratio of 2.2:1 to the extent of 99.8%. Temperature in the range of 30–60°C has marginal effect on the extent of nickel stripping. The pregnant electrolyte with a pH of 4.2 and enriched by about 3.9 kg/m 3 of nickel is suitable for electrowinning to produce nickel cathode.
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