Recovery of rare earth elements from acid mine drainage by ion exchange E. C. B. Felipe K. A. Batista A. C. Q. Ladeira 10.6084/m9.figshare.11603979.v1 https://tandf.figshare.com/articles/dataset/Recovery_of_rare_earth_elements_from_acid_mine_drainage_by_ion_exchange/11603979 <p>The current work addresses the study of the recovery of rare earth elements (REE) from acid mine water by using cationic exchange resin. The acid water was obtained from a closed uranium mine in Brazil. Ion exchange experiments were carried out in batch with three different resins at 25 ± 0.5°C and pH values 1.4, 2.4 and 3.4 (natural). Data were adjusted to the Langmuir equation in order to calculate the maximum loading capacity (q<sub>max</sub>) of the resins. The results of q<sub>max</sub> for individual REE revealed that the resins present higher loading for La in detriment to the other REE. The Dowex 50WX8 and Lewatit MDS 200 H resins demonstrated favourable sorption profiles to REE, evidenced by values of equilibrium factor (R<sub>L</sub>) and higher values of the Langmuir constants (b). The separation factors (<math><msubsup><mrow><mi>α</mi></mrow><mrow><mrow><mi>H</mi><mi>R</mi><mi>E</mi><mi>E</mi></mrow></mrow><mrow><mrow><mi>L</mi><mi>R</mi><mi>E</mi><mi>E</mi></mrow></mrow></msubsup></math>) indicates that resins are more selective for light REE at all pH studied. The selectivity of the resins for the REE can be described as light REE > heavy REE. The pH 1.4 and 3.4 are more favourable for the recovery of REE.</p> 2020-01-14 11:55:01 Cationic resin batch experiments isotherms maximum loading capacity Langmuir constants