Highly selective dissolution and synchronous extraction of zinc from zinc-cobalt slag by an ionic liquid [Hbet][Tf2N]–H2O system: A novel method for separating zinc and cobalt

Huang, Yukun; Duan, Zhuo; Bai, Ningning; Wang, Huijuan; Cao, Yijun; Song, Xiangyu; Peng, Weijun; Zhu, Xiaofeng

doi:10.1016/j.jclepro.2021.128301

Cited by 9 publications

(2 citation statements)

References 38 publications

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“…[Hbet][Tf 2 N] contains a carboxylic acid functional group (Fig. 2) and has been intensively studied for applications in extractive metallurgy [37,38,40,[50][51][52][53]. Because of the presence of the Brønsted-acidic carboxylic acid group, [Hbet][Tf 2 N] can dissolve many metal oxides, although it is a poor solvent for other metal compounds due to the poorly solvating properties of the IL cation and anion.…”

Section: Ionic Liquids (Ils)mentioning

confidence: 99%

Ionic Liquids and Deep-Eutectic Solvents in Extractive Metallurgy: Mismatch Between Academic Research and Industrial Applicability

Binnemans

Jones

2023

J. Sustain. Metall.

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The past 10–20 years have seen numerous academic papers describing the benefits of ionic liquids (ILs) and deep-eutectic solvents (DESs) for leaching, solvent extraction and electrowinning. The scientific community—including the authors of this opinion article—have frequently proclaimed these neoteric solvents as game-changers in extractive metallurgy. Despite this, there have been no commercial breakthroughs. In this paper we reflect on the reasons why ILs and DESs seem to have failed to impact on the metallurgical industry. These include: (1) issues with high viscosity; (2) limited chemical stability under the conditions of metallurgical processes; (3) difficulties with recycling and reuse; (4) a lack of demonstrated unit processes and flowsheets on the pilot scale; (5) insufficient material-property data available for engineering purposes; (6) the administrative burden of obtaining licenses and safety permits; (7) very high costs for large-scale operations; and (8) minimal added value compared to state-of-the-art hydrometallurgical processes. Our belief is that innovations in hydrometallurgy based on ILs or DESs are unlikely. Instead, we should be aiming for a deeper understanding of hydrometallurgical processes at the molecular level. This is because advances are more likely to derive from the refocused efforts of experienced IL/DES researchers investigating the speciation and chemical thermodynamics of hydrometallurgical solutions, which will then hasten the transition from linear to low-energy-input, circular hydrometallurgy. Graphical Abstract

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Section: Ionic Liquids (Ils)mentioning

confidence: 99%

Ionic Liquids and Deep-Eutectic Solvents in Extractive Metallurgy: Mismatch Between Academic Research and Industrial Applicability

Binnemans

Jones

2023

J. Sustain. Metall.

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“…Above the critical mutual solubility temperature, [Hbet][Tf 2 N] and water dissolve into one phase, and [Hbet][Tf 2 N] and water will separate into two phases with clear interfaces, just like the organic extractant and aqueous solution in the extraction process. This feature gives it the advantage of dissolving metal compounds and extracting metal ions simultaneously during the heating and cooling of the [Hbet][Tf 2 N]-H 2 O system [37][38][39][40]. Thus, [Hbet][Tf 2 N] has been used to recycle rare earth from waste lamp phosphor powders [41], and the recovery of key rare earth elements could reach 80%.…”

Section: Introductionmentioning

confidence: 99%

A Novel Dissolution and Synchronous Extraction of Rare Earth Elements from Bastnaesite by a Functionalized Ionic Liquid [Hbet][Tf2N]

et al. 2022

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Rare earth elements (REEs) are widely used in high-tech industries and are important basic raw materials. Bastnaesite is one of the most important minerals used in the rare earth extraction industry, and the efficient development of it is the key guarantee for the safe supply of rare earth raw materials. In this study, a novel method for dissolving bastnaesite using a carboxyl-functionalized ionic liquid ([Hbet][Tf2N]) is proposed. This innovative method provides a collaborative model with the dissolution and synchronous extraction of rare earth elements during the heating and cooling of the [Hbet][Tf2N]–H2O system. In the heating process, rare earth elements can be dissolved in a weakly acidic environment of ionic liquid without the trouble of HF escaping, and the leaching efficiencies of rare earth elements are above 95%. During the cooling of the leaching system, the rare earth ions in the dissolved state are extracted into the ionic liquid phase due to the two-phase stratification of [Hbet][Tf2N] and aqueous solution. It has been proved that rare earth ions recovery and ionic liquid regeneration can be achieved by back extraction using oxalic acid for the REEs-loaded ionic liquid.

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A rational strategy for synchronous extraction of lithium and boron from salt lake brines

Pan

Lin

2023

Chemical Engineering Science

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Highly selective dissolution and synchronous extraction of zinc from zinc-cobalt slag by an ionic liquid [Hbet][Tf2N]–H2O system: A novel method for separating zinc and cobalt

Cited by 9 publications

References 38 publications

Ionic Liquids and Deep-Eutectic Solvents in Extractive Metallurgy: Mismatch Between Academic Research and Industrial Applicability

Ionic Liquids and Deep-Eutectic Solvents in Extractive Metallurgy: Mismatch Between Academic Research and Industrial Applicability

A Novel Dissolution and Synchronous Extraction of Rare Earth Elements from Bastnaesite by a Functionalized Ionic Liquid [Hbet][Tf2N]

A rational strategy for synchronous extraction of lithium and boron from salt lake brines

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