1. MSCA-ETN REDMUD PROJECT
RECOVERY OF SELECTED RARE EARTHS FROM BAUXITE RESIDUE BY DRY DIGESTION WITH MULTI-STAGE CIRCULATION OF LEACH LIQUOR
MSCA-ETN REDMUD PROJECT
Rodolfo Marin Rivera, Brecht Ulenaers, Ghania Ounoughene, Koen Binnemans,
Tom Van Gerven
BR 2018, 9th May

2. High silica dissolution can lead to silica gel formation.
Dry digestion method avoids the dissolution of amorphous silica.
Silicate minerals are contacted with strong acids in a water-deficient system that avoid silica polymerization.
Si: < 5 wt.%
Sc: wt.%
REEs: 6-8 mg/L

3. REEs recovery by dry digestion method with multi-stage circulation of acid leaching solution
Concentration of REEs is 3-4 times higher compared to direct leaching without dry digestion.
Reduction by 60%
The method allows a reduction of 60% in water consumption

4. Thank you very much for your attention
Thank you very much for your 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 presentation reflects only the authors’ view, exempting the Community from any liability. Project website: The authors thank Aluminium of Greece for providing the bauxite residue sample.