Recovery and Separation of Dysprosium from Waste Neodymium Magnets through Cyphos IL 104 Extraction

Abstract

In the present study, the extraction of rare earth elements (REEs) from waste neodymium magnets using phosphorus ionic liquid Cyphos IL 104 was investigated. The objective was to recover and separate the heavy REE (Dy) from light REEs (Nd and Pr). Therefore, the experimental parameters of ionic liquid extraction, including contacting time, the initial pH value, extractant concentration, and O/A ratio, have been optimized. The highest separation factor αDy/Nd of 45.18 and αDy/Pr of 47.93 has been achieved. Following the ionic liquid extraction, the comparison of different stripping agents and the stripping parameters (the concentration of stripping agent and A/O ratio) were also explored. In short terms, this research demonstrates the optimal parameters of Cyphos IL 104 for selectively extracting high REE (Dy) and reveals its potential for recovering and separating REEs in real waste.

Efficient, fast, simple, and eco-friendly methods for separation of toxic chromium(VI) ions based on ion exchangers and polymer materials impregnated with Cyphos IL 101, Cyphos IL 104, or D2EHPA

“…Application of electrocoagulation and electrodialysis techniques (El-Taweel et al 2015 ) for Cr(VI) ions removal is also related to formulation of concentrated wastes (Sharma et al 2022 ; Chen et al 2018 ). Adsorption methods are usually characterized by easy implementation; however, they also have disadvantages (e.g., they usually are not very effective for removing trace amounts of metal ions) and systematic research is being carried out on the possibility of using more effective modified adsorbents for Cr(VI) ions removal (e.g., carbon-based adsorbents, micellar modified adsorbents) (Chen et al 2022a ; Sarfraz et al 2022 ; Badessa et al 2020 ). The recent, increase in interest in implementing biosorption processes to remove hexavalent chromium ions has been observed, which is associated with, inter alia, the fact that these methods are considered as cost effective and environmentally friendly, although they are often time-consuming (Bayuo 2021 ; Łukomska et al 2022 ).…”