Abstract
The extraction equilibrium of neodymium (Nd) with diisodecylphosphoric acid (DIDPA, HR) was measured at 303 K. The complex NdR 3 · 3HR was found to have formed and the extraction equilibrium constants were determined for n-heptane, toluene and benzene diluents. The effect of temperature on the extraction equilibrium was examined to elucidate the thermodynamics of the extraction reaction. This extraction process was found to be exothermic. The extraction rate of Nd with DIDPA was also measured using a stirred transfer cell. The dependencies of the extraction reaction on pH and extractant concentration were different for the various diluents used. The extraction rates were found to be limited by the diffusion processes of neodymium in the aqueous phase and the complex in the organic phase. The extractant, DIDPA, was found to be suitable for the extraction of lanthanides from strong acidic media from both equilibrium and kinetic aspects.
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