Recovery and separation of Pr, Nd, and Dy using solvent impregnated resin from E-wastes

In this research the extraction chromatography method of separation the sum of rare earth elements (REE) from solutions obtained during the processing of E-wastes, followed by the recovery of individual Pr, Nd, and Dy using solvent impregnated resin (SIR) was developed. The offered method in comparison with the traditional ones has more advantages such as the higher selectivity, smaller material and power resources consumption, and the reduction of liquid wastes. N,N,N´,N´,-tetraoctyldiglycolamide was used as the stationary phase of SIR. The hyper crosslinked styrene-divinylbenzene copolymer was used as the inert carrier. SIRs were characterized by FTIR- spectroscopy. It has been established that the developed resin (SIR 3) significantly surpasses known analogue in terms of the efficiency of Nd recovery from solution of NH₄NO₃. The reason of this advantage was justified by the comparison of IR spectra of these resins. The features of the recovery and separation of Nd and Fe including the influence of extractant percentage, concentration of NH₄NO₃ in feed solution were studied by extraction chromatography method. Based on these results the effective method for the recovery of sum of REE from the magnet scarp, followed by separation of individual Pr, Nd, and Dy using SIR 3 was proposed. The technological scheme of developed method was suggested.