Abstract
Recovering and concentrating rare earth metals (Nd and Dy) from waste permanent magnets rather than discarding them into the environment without pretreatment is critical for metal recycling and environmental responsibility. In this work, we used an undiluted hydrophobic pseudoprotic ionic liquid composed of trioctylamine and decanoic acid as an extractant to separate rare earth metals from aqueous media with a solvent extraction technique. This ionic liquid proved to be excellent with low viscosity and extractability reaching 100% for Nd and Dy in the presence of salts like sodium chloride and sodium nitrate. In acidic media, extractability decreased with increasing acid concentrations. Under all our experimental conditions, the rare earth metals (Nd and Dy) were found to be preferentially extracted compared to nickel with the distribution ratios of Dy higher than those of Nd.
Highlights
Rare earth metals play an important role in advanced materials such as permanent magnets, catalysts, batteries, and glass
We examined the extraction properties of Nd, Dy, and Ni with a pseudoprotic ionic liquid composed of trioctylamine and decanoic acid without diluent
The viscosity of the present pseudoprotic ionic liquid composed of trioctylamine and decanoic acid is 9.1 mPa·s
Summary
Rare earth metals play an important role in advanced materials such as permanent magnets, catalysts, batteries, and glass. The availability of rare earth metals is sometimes critical due to geopolitical issues. There is a need to develop a sustainable and economically feasible recycling process for the recovery of rare earth metals from secondary sources to reduce the dependency of the rare earth metal supply on mining production. Neodymium magnets contain a high percentage of rare earth metals (typically 25% Nd) [1]. Rare earth metals from the neodymium magnets have been recovered by a hydrometallurgical method consisting of leaching, solvent extraction, and precipitation [2]. A solvent extraction technique is applied to separate the rare earth metals from the leach liquor
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