Leaching of rare earth elements from ‘Rödberg’ ore of Fen carbonatite complex deposit, using the ionic liquid HbetTf2N

Davris, Panagiotis; Marinos, Danai; Balomenos, Efthymios; Alexandri, Alexandra; Gregou, Maria; Panias, Dimitrios; Paspaliaris, Ioannis

doi:10.1016/j.hydromet.2017.10.031

Cited by 27 publications

(18 citation statements)

References 30 publications

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“…This reaction-promoting effect of small coligands is in agreement with numerous investigations of other research groups. 4,7,8,38 However, not only water molecules can be such co-ligands, but the extensive investigations in this work give evidence for the applicability of chloride ions. Nevertheless, it has to be considered, that several metal ions form not readily soluble chloride salts aer dissolution, which might complicate downstream chemistry.…”

Section: The Role Of Chloride For the Dissolution Of Metal Oxidesmentioning

confidence: 84%

Dissolution of metal oxides in task-specific ionic liquid

Richter

Ruck

2019

RSC Adv.

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Section: The Role Of Chloride For the Dissolution Of Metal Oxidesmentioning

confidence: 84%

Dissolution of metal oxides in task-specific ionic liquid

Richter

Ruck

2019

RSC Adv.

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“…Although numerous crystal structures of polymeric metalbetaine-aqua complexes were described [102,103], synchrotron techniques revealed a dissociation to the monomeric complexes in solution [114]. A large number of oxides of main and subgroup as well as lanthanide and actinide metals were dissolved in aqueous [Hbet][NTf2] [18,102,103,113,114,117,124,125], however, negligible dissolution was observed for not readily soluble, more covalent metal oxides, such as Al2O3 [102,126,127], Fe2O3 (haematite) [126,127], MnO2 [102], TiO2 (anatase-rutile) [127], cobalt oxides [102] and U3O8 [117]. Gupta, Chandrakumar et al showed that the addition of water as a solvent is not necessary in As an example for carboxyl-functionalised ILs, a lot of research has been performed using the IL [Hbet][NTf 2 ], first described by Binnemans et al [102].…”

Section: Task-specific Ilsmentioning

confidence: 99%

Synthesis and Dissolution of Metal Oxides in Ionic Liquids and Deep Eutectic Solvents

Richter

Ruck

2019

Molecules

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Ionic liquids (ILs) and deep eutectic solvents (DESs) have proven to be suitable solvents and reactants for low-temperature reactions. To date, several attempts were made to apply this promising class of materials to metal oxide chemistry, which, conventionally, is performed at high temperatures. This review gives an overview about the scientific approaches of the synthesis as well as the dissolution of metal oxides in ILs and DESs. A wide range of metal oxides along with numerous ILs and DESs are covered by this research. With ILs and DESs being involved, many metal oxide phases as well as different particle morphologies were obtained by means of relatively simple reactions paths. By the development of acidic task-specific ILs and DESs, even difficultly soluble metal oxides were dissolved and, hence, made accessible for downstream chemistry. Especially the role of ILs in these reactions is in the focus of discussion.

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“…Very few studies have reported on the dissolution of metals or metal oxides in ionic liquids above 100 C. Davris et al carried out studies on the use of the ionic liquids [EMIM][HSO 4 ] and [Hbet][Tf 2 N] to leach rare earths from bauxite residues. [22][23][24][25][26] In particular for the [Hbet][Tf 2 N] they worked at temperatures between 60 C and 180 C in an autoclave reactor. They investigated, among the other parameters, the role of water on the leaching both for solid waste and for natural ore, and they found an optimum at 40% v/v content of water in [Hbet][Tf 2 N].…”

Section: Introductionmentioning

confidence: 99%