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

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: 30-40 wt.% REEs: 6-8 mg/L

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

Thank you very much for your attention http://www.etn.redmud.org 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. 636876 (MSCA- ETN REDMUD). This presentation reflects only the authors’ view, exempting the Community from any liability. Project website: http://www.etn.redmud.org. The authors thank Aluminium of Greece for providing the bauxite residue sample.