Enrichment of trace rare earth elements from the leaching liquor of ion-absorption minerals using a solid complex centrifugal separation process

Abstract

A novel solid complex centrifugal separation (SCCS) process has been developed to enrich trace rare earth (RE) elements from the leaching liquor of ion-absorption RE minerals.

Selective Dissolution and Separation of Rare Earths Using Guanidine-Based Deep Eutectic Solvents

“…For recovery, the oxalic acid was added into the La-loaded GUC-LAC to get a precipitate of La 2 (C 2 O 4 ) 3 . , After calcination at 900 °C for 6 h, the product was verified as La 2 O 3 with high purity according to the result of XRD in Figure , which further proves it is feasible to extract La with the green GUC-LAC solvent. The results of SEM-EDS in Figure S2 also confirmed this conclusion.…”

Efficient Recovery of End-of-Life NdFeB Permanent Magnets by Selective Leaching with Deep Eutectic Solvents

“…In modern society, rare earth elements (REEs) play an essential role in electric cars, wind turbines, electronics, photovoltaic films, catalysts, glass, ceramics, metallurgy/alloys, etc. These wide and critical applications are based on the unique magnetic, catalyst, and phosphorescent properties of REEs, leading to the high demand of raw REE materials, such as permanent magnets, hydrogen storage alloys, and phosphor powders. − In these materials, a neodymium–iron–boron (NdFeB) magnet is essential in digital electronics and clean energy industry because of its higher maximum energy product than a traditional permanent magnet. , In the leading REE production country, China, praseodymium and neodymium occupy less than 30% of the production but contribute to more than 70% of the benefits. The gap between the high industrial demand for REEs in magnets and their low relative abundance in carbonatite deposits requires new resources of these elements other than traditional REE ores .…”

“…Various technologies have been developed to recover REEs from end-of-life magnets, including hydrometallurgy, electrochemistry, gas-phase extraction, membrane separation, biological extraction, and pyrometallurgy. ,,− Among them, the solvent extraction technique, a typical hydrometallurgy technique applied in the rare earth ore processing, is widely considered to be more suitable for recovering REEs on a large scale. − The solvent extraction has some advantages, such as high processing capacity, low cost, and continuous production, but it also generates severe environmental burden as a result of using high volumes of acid/base reagents and volatile organic solvents. ,,, Thus, some more environmentally friendly REE recycling processes are highly desirable …”

Crystal structure of catena-poly[diaqua-bis(μ2-2-(4-(2,4,4-trimethylpentan-2-yl)phenoxy)propanoato-κ2 O:O')-(2-(4-(2,4,4-trimethylpentan-2-yl)phenoxy)propanoato-κ2 O,O')yttrium(III)], C51H79O11Y

“…Various extractants have been developed for extraction and separation of rare earths, among organic acid proved to be efficient extractants. In our present project [5,6], the para-(tert-octylphenoxy)iso-propanoic acid was used for the extraction of yttrium ions.…”