Immobilization of Eu and Ho from synthetic acid mine drainage by precipitation with Fe and Al (hydr)oxides

Barcelos, Gisely Souza; Veloso, Renato Welmer; Mello, Jaime Wilson Vargas de; Gasparon, Massimo

doi:10.1007/s11356-018-2100-5

Cited by 12 publications

(5 citation statements)

References 39 publications

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“…Previous studies have shown that the presence of well crystallised Fe (hydr)oxides, especially magnetite, increased the stability of REE in precipitates (Barcelos et al 2018a(Barcelos et al , 2018bPietralonga et al 2017). In the present study, however, magnetite was not detected and the presence of goethite and hematite did not significantly affect the stability of REE in precipitates.…”

Section: Stability Of Precipitatescontrasting

confidence: 64%

“…The role of Al on stability of trace elements associated to Fe (hydr)oxides is rather controversial. There are reports that the presence of Al decreases the stability in precipitates for some REE (Barcelos et al 2018b;Pietralonga et al 2017), but not for others (Barcelos et al 2018a(Barcelos et al , 2018b. Mello et al (2018) also observed decreasing As stability in precipitates, while Silva et al (2010) demonstrated increasing As stability due to the presence of structural Al in Fe (hydr)oxides.…”

Section: Stability Of Precipitatesmentioning

confidence: 98%

“…It is also worth of note that no magnetite peaks were detected in precipitates from Fe(II) treatments, even in the absence of Al. Based on previous studies magnetite should be detected at Fe(II):REE molar ratios higher than 500:50 (Barcelos et al 2018a(Barcelos et al , 2018bPietralonga et al 2017). However, in these previous studies individual REE were considered, while a mixed REE solution was used here instead.…”

Section: Ree Stability On Precipitatesmentioning

confidence: 99%

“…The use of Al aimed to evaluate its effects in the stability of co-precipitated phases (Barcelos et al 2018a;Pietralonga et al 2017;Silva et al 2010;Jeanroy et al 1991;Schwertmann 1984). Values considered for pH were 9.0 (six treatments) and 6.0 (four treatments), consistent with the range allowed for effluents discharge in Brazil (5.0 to 9.0) according to Resolution 430 of the Brazilian Environmental National Council (CONAMA, 2011).…”

Section: Experimental Setsmentioning

confidence: 99%

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Removal of lanthanum, cerium, europium and holmium from water by co-precipitation with iron and aluminium (hydr)oxides

Barcelos¹

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Effluents from mining activities may have high concentrations of trace elements such as arsenic, rare earth elements (REE) and actinides, mainly in areas where acid mine drainage (AMD) occurs. Use of lime to neutralise AMD also promote co-precipitation of iron (Fe) and aluminium (Al) (hydr)oxides, increasing the removal of trace elements from water. This study aimed to evaluate the efficiency of Fe/Al (hydr)oxides co-precipitation to remove lanthanum (La), cerium (Ce), europium (Eu) and holmium (Ho) from water under laboratory conditions. Two sets of experiments were performed with individual REE solutions containing Eu and Ho. In these cases, Fe(II) and Al sulphates were used at different Fe:Al:REE molar ratios. Two other sets of experiments with Fe(II) and Fe(III) sulphates were performed in a mixed REE solution containing La, Ce, Eu and Ho. To coprecipitate Fe/Al (hydr)oxides, pH's were raised to 9.0 and 6.0 with 5 mol L-1 KOH solution. Soluble contents of Fe, Al and REE were periodically measured in supernatants aliquots. Precipitates were collected at the end of the 60-day incubation period and, then, oven-dried, sieved and characterised by X-ray diffraction (XRD) and scanning electron microscopy (SEM) analysis. The stability of REE in precipitates was also assessed by BCR sequential extractions. All treatments presented high REE removal efficiency from water at pH 9.0, but significantly lower at pH 6.0 for Fe(II) treatments. Magnetite precipitation was favoured by lower contents of REE and Al, whereas goethite and lepidocrocite were favoured at higher contents. Segregated phases were not detected for Eu and Ho, but lanthanite and cerianite precipitated at high amounts of La and Ce, respectively. For mixed REE treatments, the mineralogical phases precipitated were mostly poorly crystallised. The presence of magnetite was associated to higher REE stabilities, whereas lepidocrocite decreased the stability as measured by BCR extractions. The presence of segregated phases as cerianite resulted in increased Ce stability, but presence of lanthanite decreased La stability in precipitates.

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Section: Stability Of Precipitatescontrasting

confidence: 64%

Section: Stability Of Precipitatesmentioning

confidence: 98%

Section: Ree Stability On Precipitatesmentioning

confidence: 99%

Section: Experimental Setsmentioning

confidence: 99%

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Removal of lanthanum, cerium, europium and holmium from water by co-precipitation with iron and aluminium (hydr)oxides

Barcelos¹

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“…It is well known that acidic mine drainage can form small-scale (colloidal) "iron hydroxide" deposits (Ayora et al, 2016). These hydroxides can enrich REEs by precipitation and adsorption (Barcelos et al, 2018), and then enter the sediments through the so-called "salting out" process (Sholkovitz and Szymczak, 2000;Kulaksiz and Bau, 2007). This also explains the high correlation between Fe 2 O 3 and REEs (always ≥ 0.44).…”

Section: The Correlation Analysis Between Major Elements and Rees In The Sedimentmentioning

confidence: 98%

Distribution and source determination of rare earth elements in sediment collected from the continental shelf off Hainan Island, China

Cai

et al. 2021

Environ Sci Pollut Res

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Mine drainage: Treatment technologies and rare earth elements

Wei

Zhang

Shimko³

et al. 2019

Water Environment Research

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The recent research and development on mine drainage published in 2018 was summarized in this annual review. In particular, this review was focused on two main aspects of mine drainage: (a) advances in treatment technologies and (b) rare earth elements in mine drainage and its recovery. The first section covers passive treatment technologies and active treatment options, including physiochemical treatment and biological treatment. The second section includes the characterization of rare earth elements in mine drainage and recovery technologies. Due to the importance of rare earth elements and the growing interest in their recovery from mine drainage, rare earth elements are reported as a separate section for the first time in this review.Practitioner points Advances in treatment technologies for mine drainage are reviewed. Rare earth elements in mine drainage and its recovery are summarized. Reviewed technologies include passive, active, advanced and novel processes.

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Immobilization of Eu and Ho from synthetic acid mine drainage by precipitation with Fe and Al (hydr)oxides

Cited by 12 publications

References 39 publications

Removal of lanthanum, cerium, europium and holmium from water by co-precipitation with iron and aluminium (hydr)oxides

Removal of lanthanum, cerium, europium and holmium from water by co-precipitation with iron and aluminium (hydr)oxides

Distribution and source determination of rare earth elements in sediment collected from the continental shelf off Hainan Island, China

Mine drainage: Treatment technologies and rare earth elements

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