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Rare earth elements (REEs) purification is the process of separating the 15 lanthanide elements along with scandium and yttrium, which are commonly found together in nature and exhibit extremely similar chemical properties, into high-purity individual products suitable for high-technology applications. Although these elements occur in the Earth’s crust in abundance comparable to metals such as copper or lead, they are termed “rare” due to the difficulty of obtaining them in pure form. Scientific