Rare earth elements (REE) are recognized as critical raw materials because of their crucial role in vital components of numerous green and high-tech applications. In the present study, antisolvent crystallization of REE sulfate hydrates of industrial interest (Nd (III), Pr (III), and Dy (III)) from sulfuric acid solutions by the addition of ethanol has been studied. Crystallization of REEs in the presence of Fe (II) and Fe (III) as major impurities along with Al (III), Cu (II), Co (II), and B (III) as trace elements is investigated. The incorporation of impurities and its effect on the growing REE phase is examined. The effect of controlled supersaturation generation rate on the product quality (e.g. purity) and crystal phase is investigated. The solid phases are characterized using optical microscopy, SEM-EDX, powder-XRD, and ICP-OES. The findings can offer significant insights to understand and optimize the recovery of REEs from leach liquor in the recycling of magnet waste.