An efficient and sustainable [P6,6,6,14]2[BDOAC] ionic liquid based extraction–precipitation strategy for rare earth recovery

Su, Xiang; Guo, Xiaoying; Zhao, Zeyuan; Dong, Yamin; Wang, Yanliang; Li, Fujian; Sun, Xiaoqi

doi:10.1016/j.cherd.2018.06.029

Cited by 14 publications

(9 citation statements)

References 35 publications

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“…As shown in Figure , the linear relationship between log D M and log[IL] is well fitted when the concentration of ILs is changed from 3.5 × 10 –3 to 9.5 × 10 –3 mol/L. The slope of [P 6,6,6,14 ] 2 [MPBOA]-La(III) is 1.6614, which is similar to the previous reported coefficient for [P 6,6,6,14 ] 2 [BDOAC] (the ratio is 1.5) . As for the [P 6,6,6,14 ] 2 [MPBOA]-Ni(II) system, the slope is indicated to be 1.6193.…”

Section: Resultssupporting

confidence: 83%

“…As for the IL-based extraction system, there are some kinds of extraction mechanisms such as ion exchange, ion association, salvation, and so forth . In our previous work, the extraction–precipitation mechanism of the [P 6,6,6,14 ] 2 [BDOAC]-Nd(III) system was indicated to be ion exchange . In this study, the extraction mechanisms of the [P 6,6,6,14 ] 2 [PPBHA] and [P 6,6,6,14 ] 2 [MPBOA] systems were further investigated.…”

Section: Resultsmentioning

confidence: 99%

“…All the phenoxycarboxylic acids of [2,2′-(1,4-phenylenebis(oxy))dibutyric acid (PPBBA), 2,2′-(1,4-phenylenebis(oxy))dipentanoic acid (PPBEA), 2,2′-(1,4-phenylenebis(oxy))dihexanoic acid (PPBHA), 2,2′-(1,4-phenylenebis(oxy))dioctanoic acid (PPBOA), 2,2′-(1,3-phenylenebis(oxy))dioctanoic acid (MPBOA), and 2,2′-(1,2-phenylenebis(oxy))dioctanoic acid (OPBOA)] were synthesized using a two-step method in reference to our previous work . The synthetic method of 2,2′-(1,4-phenylenebis(oxy))dipropionic acid (PPBPA) was referred to that of benzene-1,4-dioxydiacetic acid (H 2 BDOAC) . The synthesized carboxylic acids and [P 6,6,6,14 ]Cl were used to prepare ILs by ion-exchange and neutralizing reactions .…”

Section: Experimental Sectionmentioning

confidence: 99%

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Phenoxy Dicarboxylate-Type Functionalized Ionic Liquids for Selective Recovery of Valuable Metals

Zhao

Sun

2020

Ind. Eng. Chem. Res.

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Eight functionalized ionic liquids (ILs) prepared by trihexyl-(tetradecyl)phosphonium chloride ([P 6,6,6,14 ]Cl) and phenoxy dicarboxylic acids were studied for valuable metal recovery in this paper. The effects of alkyl chain length and its structural isomerism on the physicochemical properties of the ILs were determined. It was found that the ILs had higher extractabilities to RE[La(III), Nd(III), Eu(III), Lu(III), Y(III)], Cu(II), and Zn(II) than some other metal ions [Mg(II), Ca(II), Sr(II), Mn(II), Co(II), and Ni(II)]. Moreover, Cu(II) and Zn(II) could be easily stripped from the RE(III)-loaded ILs using ammonium hydroxide solution. Further experiments showed that the weakly extracted metal ions could be effectively scrubbed and stripped with NaCl solution, thereby preferentially extracting metals with high purities. The applications of the proposed recovery systems were effectively demonstrated by the fact that 100 wt % Cu(II) and 99.9 wt % La(III) could be obtained in the separation process of Cu(II)/ Co(II) and La(III)/Ni(II), respectively.

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Section: Resultssupporting

confidence: 83%

Section: Resultsmentioning

confidence: 99%

Section: Experimental Sectionmentioning

confidence: 99%

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Phenoxy Dicarboxylate-Type Functionalized Ionic Liquids for Selective Recovery of Valuable Metals

Zhao

Sun

2020

Ind. Eng. Chem. Res.

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“…The concentration of rare-earth ions was determined by ICP, and the amount of REEs recovered by extraction-precipitation was calculated by mass balance. Precipitation rate ( P %), stripping rate ( S %), recovery rate ( C ), and loading capacity ( Q e ) are defined in eqs – , In the above equations, [M] o is the concentration of REE ions in an aqueous solution before the extraction-precipitation experiment (mol/L), [M] aq is the concentration of rare-earth ions in an aqueous solution after the extraction-precipitation experiment (mol/L). [M] t ′ is the equilibrium concentration of rare-earth ions in the stripping HCl solution (mol/L), [M] t is the concentration of rare-earth ions in an aqueous solution before the stripping experiment (mol/L).…”

Section: Methodsmentioning

confidence: 99%

“…31 In this study, CPDA was used to precipitate Nd 3+ from a 0.005 mol/L NdCl 3 solution to prepare the solid extracting complex. As in our previous paper, 27 the stripping effect of hydrochloric acid with different concentrations for the solid extracting complex was also studied. Higher concentrations of acid should be avoided in view of environmental pollution.…”

Section: Stripping and Recycling Properties Of Cpdamentioning

confidence: 98%

Enrichment of Rare Earth from Wasted NdFeB Lotion with the Extraction-Precipitation Method

Cao

et al. 2021

Ind. Eng. Chem. Res.

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Extraction-precipitation is a new type of separation technology. By forming a solid extracting complex in the aqueous phase, the process can realize efficient recovery of rare-earth elements (REEs). Compared with the traditional liquid−liquid extraction and chemical precipitation, its advantage lies in that no organic solvent is used and the extraction-precipitant can be recycled. In this study, two novel extractionprecipitants of 2,2′-((cyclohexane-1,1-diylbis(4,1-phenylene))bis(oxy)) diacetic acid (CPDA) and 2,2′-((oxybis(4,1-phenylene))bis(oxy)) diacetic acid (OPDA) were developed and compared with the REE recovery performance of the other extractionprecipitants, i.e., 2,2′-((propane-2,2-diylbis(4,1-phenylene))bis(oxy)) diacetic acid (PPDA) and 2-(4-(2,4,4-trimethylpentan-2-yl) phenoxy) acetic acid (POAA). The effects of aqueous phase pH value, reaction equilibrium time, saponification degree, extraction-precipitant amount, and the ratio of REE were investigated. The mechanism for the extraction-precipitation process was indicated to be cation exchange. CPDA, OPDA, and PPDA with a dicarboxylic acid structure showed stronger loading capacities and faster precipitation speed for neodymium (Nd) than POAA with a monocarboxylic acid structure. Among these extraction-precipitants, CPDA had the lowest water solubility and therefore could be easily recycled. The extraction-precipitation technology was successfully used to recover REE from the lotion of waste neodymium ferroboron (abbreviated as NdFeB) magnets with a recovery rate of 90%. The concentration of REE was increased from 51.4 mg/L to 19.6 g/L, accordingly, and the enrichment was about 400 times. This study provides new insight into the recycling of REE secondary resources.

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Recent Advances in the Application of Greener Solvents for Extraction, Recovery and Dissolution of Precious Metals and Rare Earth Elements from Different Matrices

Nomngongo

Biata

Sihlahla

et al. 2020

Nanotechnology-Based Industrial Applications of Ionic Liquids

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An efficient and sustainable [P6,6,6,14]2[BDOAC] ionic liquid based extraction–precipitation strategy for rare earth recovery

Cited by 14 publications

References 35 publications

Phenoxy Dicarboxylate-Type Functionalized Ionic Liquids for Selective Recovery of Valuable Metals

Phenoxy Dicarboxylate-Type Functionalized Ionic Liquids for Selective Recovery of Valuable Metals

Enrichment of Rare Earth from Wasted NdFeB Lotion with the Extraction-Precipitation Method

Recent Advances in the Application of Greener Solvents for Extraction, Recovery and Dissolution of Precious Metals and Rare Earth Elements from Different Matrices

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