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A mathematical model to predict the extraction has been developed for the Cu-MOC 45 system. The model consists of sets of nonlinear mass action and mass balance equations where the dimerization of the oxime was also considered. The predictive model calculated the equilibrium concentrations from the total oxime concentration, total copper concentration, initial pH value and the O/A volume phase ratio. The model suggests that the extraction of copper can be defined by the existence of two species into the organic solution: CuR 2 ( k ext = 4.2) and Cu(HR 2 ) 2 ( k ext = 10.000)- The initial oxime concentration defines the predominancy in the organic solution of both species. The model can be used to predict copper extraction isotherm as well as copper stripping with sulphuric acid.

Modelling copper solvent extraction from acidic sulphate solutions using MOC 45