1. Chiara BONOMI, Ioanna GIANNOPOULOU, Johannes VIND, Dimitrios PANIAS
1-ETHYL-3-METHYLIMIDAZOLIUM HYDROGEN SULPHATE IONIC LIQUID LEACHING OF BAUXITE RESIDUE: IRON, TITANIUM AND SCANDIUM RECOVERY
Chiara BONOMI, Ioanna GIANNOPOULOU, Johannes VIND, Dimitrios PANIAS

2. Bauxite residue characterisation
REEs Ce La Sc Nd Y
mg/kg
402
195
140
127
111

3. Leaching BR with Emim[HSO4]
1-Ethyl-3-methylhydrogen sulphate
Parameters
200 rpm
200 °C
12 hours
5 % w/v pulp density

4. Characterisation of the solid residue after leaching

5. Characterisation of the solid residue after leaching
Ce phosphate particle containing also La and Nd and Sm.

6. Conclusions
The Brønsted acidic ionic liquid [Emim][HSO4] is able to achieve high recovery yields of Sc (78 %) and Ti (92%) together with some co-extraction of the major constituents of BR (Fe, Al, Na)
REEs are not dissolved and remain in the solid residue
Ca precipitates as CaSO4

7. Thank you for your kind attention
The research leading to these results has received funding from the European Community’s Horizon 2020 Programme ([H2020/2014– 2019]) under Grant Agreement no (MSCA-ETN REDMUD). This publication reflects only the authors’ view, exempting the Community from any liability. Project website:
Chiara Bonomi, Ioanna Giannopoulou, Johannes Vind, Dimitrios Panias