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Category Publication Title Publication Content Date Request
Rare Earth Elements (REE) Highly Selective Separations at High Purity and High Recovery of Individual Rare Earth Elements from Industrial Feedstocks using Molecular Recognition Technology™ (MRT™) Izatt, S.R. et al. 2022 In preparation

Highly selective laboratory-scale separations at high purity (99%+) and high recovery (99%+) of the 16 individual rare earth elements (REE excluding Pm) from a pregnant leach solution (PLS) derived from mined ore. Pilot plant results: 1) 99%+ of the REE were first separated as a group from accompanying impurity metals found in the PLS. 2) 99%+ of the scandium was then separated from this REE group, concentrated over 100-fold in the process, and recovered at high purity (99.9%+.) 3) The remaining REE group was separated into heavy and light REE fractions. 4) 99%+ of the dysprosium (Dy) was separated from the heavy REE fraction and recovered at 99.99% purity in ten stages, using the same MRT™ equipment. This is approximately 30-fold fewer stages than are required to reach this purity level for Dy using industrial solvent extraction (SX) processes, which require use of hundreds of mixer-settler stages. No mixer-settlers or organic solvents are used in MRT™ processes Highly selective separation and recovery rates (near 100%) at laboratory-scale of Nd and Dy from nitric acid leachate of spent high strength permanent magnets with high purity (99.9%+) of each REE High separation rates and high recovery rates at high purity make circular economies possible using green chemistry MRT™ processes that lead to individual REE sustainability Highly selective MRT™ processes have significantly lower estimated CAPEX and OPEX values compared to SX processes that are used in industrial REE separations and recovery