Equilibrium characteristics for the extraction of cobalt and nickel into di(2‐ethylhexyl) phosphoric acid

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Abstract
The liquid‐liquid extraction of cobalt and nickel from aqueous sulphate solutions into di(2‐ethylhexyl) phosphoric acid, DZEHPA, has been investigated at 25°C and 60°C. The system studied was made up as follows: the aqueous phase‐cobalt and nickel dphates; the organic phase‐20% D2EHPA, 75% Esso solvent DX3641 and 5% tri‐butyl phosphate. Analogies to vapour‐liquid equilibria were made to develop three methods to correlate the binary equilibrium data, namely: 1) a delta Y method, 2) a method based on the correlation of solvent free mole fractions in both phases and 3) a “pseudo activity” coefficient or pseudo gamma method, γAB.The methods were evaluated as to their suitability for the prediction of binary isotherms. The delta Y and pseudo gamma methods were found to give the best results.

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