Sorption of rare earth elements on schwertmannite and their mobility in acid mine drainage treatments

Lozano, Alba; Ayora, Carlos; Fernández-Martı́nez, Alejandro

doi:10.1016/j.apgeochem.2019.104499

Cited by 52 publications

(14 citation statements)

References 79 publications

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“…Schwertmannite forms at pH values below 4 and basaluminite forms at pH values above 4. A minor fraction of Sc, however, was observed to be retained in schwertmannite (Zhang and Honaker, 2018;Lozano et al, 2020). Again, the REE behavior is consistent with the pK values of their hydrolysis constants, which are 4.3 for Sc (Wood and Samson, 2006) and 7.2 to 8.81 for Y and lanthanides (Klungness and Byrne, 2000).…”

Section: Introductionsupporting

confidence: 72%

Geochemical behavior of rare earth elements in acid drainages: Modeling achievements and limitations

Lozano

Ayora

Macías

et al. 2020

Journal of Geochemical Exploration

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Section: Introductionsupporting

confidence: 72%

Geochemical behavior of rare earth elements in acid drainages: Modeling achievements and limitations

Lozano

Ayora

Macías

et al. 2020

Journal of Geochemical Exploration

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“…In Stream1, Stream2 and Stream3, the concentrations of metal elements (except Ba) and SO 4 2decreased along the water flow direction, which were mainly due to the dilution effect of inflowing water. However, the ochre deposits found on the river bank indicated that during the transport of highly concentrated Fe, Mn or other metal elements, various colloids and secondary minerals may be formed and precipitated, which could provoke rapid decreases of metal concentrations by absorption or coprecipitation (Caraballo et al 2019;Carbone et al 2013;Lee et al 2002;Liu et al 2017;Lozano et al 2020;Lozano et al 2018;Sánchez-España et al 2011). One the contrary, the concentration of Ba increased.…”

Section: Spatial-temporal Variations Of Metal Elements and Sulfatesmentioning

confidence: 99%

Spatial-temporal variations and multi-statistical analysis of contaminants in the waters affected by acid mining drainage in Karst area: A case of coal-mining area in Zhijin County

Qin

Pan

et al. 2021

Preprint

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Due to the adverse effects of coal mining activities in Karst areas, it’s necessary to monitor the contaminants, analyze their fate in the transport and identify the sources. Therefore, concentrations of contaminants were measured in both groundwater and surface water samples collected from coal-mining area in Karst, located in Zhijin County, Guizhou Province (China). The analysis of spatial-temporal variations of contaminants indicates that (1) the concentrations of metal elements (except Ba) and SO42− tend to decrease along the water flow direction while the concentrations of Ba and nitrate still show an upward trend and (2) the concentrations of metal elements and SO42− in Stream1 and Stream3, are higher in wet season than dry season. Further, the results of multi-statistical analysis which combined Pearson correlation coefficients(PCC)with the principal component analysis (PCA), identify five factors for the data structure of contaminants. What’s more, the assessment of the water quality was evaluated by Nemerow index method to better understand the status. The results indicate that over 60% of water samples were divided into Grade IV and Grade Ⅴ.

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“…Therefore, the precipitation of schwertmannite and particularly basaluminite can be considered an effective and long-lasting natural mechanism for REE removal from water. When AMD is neutralized with alkaline reagents in treatment plants, practically all REEs are retained in the sludge of schwertmannite, basaluminite and gypsum, resulting in a residue with REE concentrations similar to those of present-day mines and prospects (Ayora et al 2016;Lozano et al 2020b;Macías et al 2017;Vass et al 2019a,b;Honaker 2018, 2020).…”

Section: Introductionmentioning

confidence: 99%

Partition of Rare Earth Elements Between Sulfate Salts Formed by the Evaporation of Acid Mine Drainage

et al. 2021

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Acid mine drainage (AMD) contains rare earth element (REE) concentrations several orders of magnitude higher than those of the rest of natural waters and could be a secondary source of REEs. In arid to semiarid climates with a long dry season, the precipitation of efflorescent sulfates constitutes a transient storage of REEs. The REE partition among the Al-Fe-Mg-Ca sulfates formed by the evaporation to dryness of six different AMDs was investigated by statistical methods and by selective dissolution. The chemical composition of the evaporitic salts showed that only three principal components (PCs) could explain more than 80% of the variability in the six samples analyzed. PC1 was associated with Ca and light REEs and interpreted as gypsum, whereas PC2 was associated with Y and heavy REEs, which were not clearly associated with a major sulfate. Finally, PC3 included Mg, Fe and several transition metals (Cu, Ni, Co, Mn and Zn) and was interpreted as Fe(II)-Mg sulfates. Selective dissolution of the salt mixtures with solutions saturated in the major sulfates revealed that the REEs were only retained in gypsum and were practically absent from the rest of the sulfates. The incorporation of REEs into gypsum decreased from Pr-Nd to La and Lu and was strictly ruled by the differences in their atomic radii and that of Ca in eight-fold coordination. However, gypsum concentrated less than 20% of the REE inventory (< 1% for Sc); the rest probably formed one or more unidentified trace minerals. This indicates that gypsum may not be an efficient way to concentrate REEs from AMD.

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Sorption of rare earth elements on schwertmannite and their mobility in acid mine drainage treatments

Cited by 52 publications

References 79 publications

Geochemical behavior of rare earth elements in acid drainages: Modeling achievements and limitations

Geochemical behavior of rare earth elements in acid drainages: Modeling achievements and limitations

Spatial-temporal variations and multi-statistical analysis of contaminants in the waters affected by acid mining drainage in Karst area: A case of coal-mining area in Zhijin County

Partition of Rare Earth Elements Between Sulfate Salts Formed by the Evaporation of Acid Mine Drainage

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