Environmentally friendly comprehensive hydrometallurgical method development for neodymium recovery from mixed rare earth aqueous solutions using organo-phosphorus derivatives

Abstract

Rare earth elements (REEs) have obtained a greatest significant in human lives owing to their important roles in various high technology applications. The present method development was deal technology important REEs such as neodymium, terbium and dysprosium, selective extraction with possible separation and recovery studies, successfully. The chloride mediated mixed aqueous solution containing 1500 mg/L each of REEs such as Nd, Tb and Dy was subjected at selective separation of Nd from other associated REEs. Three organo-phosphorous based commercial extracting agents such as Cyanex 272, PC 88A and D2EHPA, were employed for the extraction, possible separation and recovery of rare earth elements. A comparative extraction behavior of all these three extractants as function of time, pH influence, extractant concentration, temperature and diluents were systematically investigated. The extraction tendency of organo-phosphorus reagents towards the extraction of either of the REEs follows of the sequence as: D2EHPA > PC 88A > Cyanex 272. The thermodynamic behavior of either of the extractants on liquid–liquid extraction processing of REEs was investigated and thermodynamic calculations were calculated and presented. Substantial recovery of neodymium oxalate followed by its calcined product as neodymium oxide was ascertained from XRD study and SEM–EDS analysis.

One‐Pot, Three‐Phase Recycling of Metals from Li‐Ion Batteries in Rotating, Concentric‐Liquid Reactors

“…These aspects, as well as favorable power-to-operate versus reactor-size scaling, make CLiRs an interesting alternative to the traditional hydrometallurgical methods and potentially applicable to separations of other valuable metals. [65][66][67][68]…”

Preparation and characterization of a mesoporous silica-based copolymer loaded with bis(2-ethylhexyl) phosphate for the efficient separation of trace radium from natural thorium

“…The results suggested that HDEHP was successfully impregnated in SiPS. However, due to the strong absorption of SiO2, the characteristic peaks of P=O and P-O were covered by SiO2, which were reported locating at 1230 cm − 1 and 1030 cm − 1 , respectively [39,40]. The presence of P was finally determined using the XPS spectrum, as shown in Fig.…”

Efficient and Selective Adsorption of Neodymium on Expanded Vermiculite

“…The selectivity coefficient (S Nd/M ) was defined as the ratio of the distribution coefficient between Nd(III) and other metals eq 17. 53 S K (17) where K d (L/g) is the distribution coefficient of the selected metal ion between the adsorbent and the solution; C e (mmol/ L) and q e (mmol/g) are the concentration and adsorption capacities of the metal ion at the equilibrium.…”

“…There are several methods to separate and purify these ions, including classical hydrometallurgical processes (leaching, chemical precipitation, and solvent extraction), ion exchange, and adsorption . Leaching followed by the extraction of Nd has been proposed by several authors using alternative solvents. − However, despite the high recovery of REM, solvent extraction is a high-cost and complex process that generates large volumes of waste . Adsorption, in turn, has stood out for its simplicity, high efficiency, capacity to concentrate, and desorb (recovery) the adsorbate from diluted solutions. , One of the determining factors for the overall adsorption efficiency is the type of the adsorbent matrix applied.…”