Characterization of the dissolution of tooeleite under Acidithiobacillus ferrooxidans relevant to mineral trap for arsenic removal

Liu, Jing; He, Lile; Chen, Shu; Dong, Faqin; Frost, Ray L.

doi:10.1080/19443994.2015.1069225

Cited by 2 publications

(5 citation statements)

References 18 publications

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“…Solids from the Ar control group clearly had more peaks than those of the Re control group in Stage 1. These peaks occurred at 1203, 1076, 996, 627 and 466 cm −1 , which originated from the ν 3 (1203 and 1076 cm −1 ), ν 1 (996 cm −1 ), ν 4 (627 cm −1 ) and ν 2 (466 cm −1 ) vibrations of SO 4 2− , respectively (Liu et al , 2016). The intensities of the peaks increased due to dissolution of tailings and secondary mineralisation.…”

Section: Resultsmentioning

confidence: 99%

In situremediation of arsenic-rich mine tailings using slag zero valence iron

Yue

Chen

Liu

2020

MinMag

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Arsenopyrite (FeAsS) and realgar (As4S4) are two common arsenic minerals that often cause serious environmental issues. Centralised treatment of arsenic-containing tailings can reduce land occupation and save management costs. The current work examined the remediation schemes of tailings from Hunan Province, China, where by different tailings containing arsenopyrite and realgar were blended with exogenous slag zero valence iron (ZVI). Introducing Fe-oxidising bacteria (Acidithiobacillus ferrooxidans) recreates a biologically oxidative environment. All bioleaching experiments were done over three stages, each for 7 days and the solid phase of all tests was characterised by scanning electron microscopy, X-ray diffraction, Fourier-transform infrared spectroscopy, X-ray photoelectron spectroscopy and selective extraction analyses. The results showed that the mixture group reduced arsenic release by 72.9–74.7% compared with the control group. The addition of 0.2 g ZVI clearly decreased arsenic release, and the addition of 4.0 g ZVI led to the lowest arsenic release among all tests. The decrease of arsenic released from the tailings was due to the adsorption and uptake of arsenic by secondary iron-containing minerals and Fe–As(V) secondary mineralisation. The addition of large amounts of ZVI reduced the arsenic detected in the amorphous Fe precipitates. Therefore, a low cost and integrated strategy to reduce arsenic release from tailings is to mix two typical tailings and apply exogenous slag ZVI, which can apply to the in situ remediation of two kinds or more arsenic-containing tailings.

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Section: Resultsmentioning

confidence: 99%

In situremediation of arsenic-rich mine tailings using slag zero valence iron

Yue

Chen

Liu

2020

MinMag

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“…Previous studies on tooeleite stability at pH > 3.5 have considered oxic conditions where Fe(II) is absent. 25,26,47,48 The present study is significant in that it is the first to evaluate tooeleite stability under anoxic conditions at higher pH. Under such conditions, Fe(II) can be produced by microbially mediated Fe(III) reduction and may subsequently interact with tooeleite.…”

Section: ■ Experimental Designmentioning

confidence: 94%

“…As such, tooeleite has been reported to occur in As(III)-rich acid mine drainage (AMD), − mining waste-rock and tailings, − hydrometallurgical waste, and surface soils of mine sites . Understanding tooeleite formation, stability, and fate is of increasing interest from the perspective of managing As mobility in mining-impacted systems. , …”

Section: Introductionmentioning

confidence: 99%

“… 24 Understanding tooeleite formation, stability, and fate is of increasing interest from the perspective of managing As mobility in mining-impacted systems. 25 , 26 …”

Section: Introductionmentioning

confidence: 99%

“…24 Understanding tooeleite formation, stability, and fate is of increasing interest from the perspective of managing As mobility in mining-impacted systems. 25,26 Many abandoned mine sites and associated mining-impacted systems contain As-contaminated waste and soil that experience periodical waterlogging, which can lead to partial reductive dissolution of Fe(III)-bearing minerals. 27,28 The resulting juxtaposition of newly produced aqueous Fe(II) and residual Fe(III)-bearing minerals may lead to rapid Fe(II)induced mineral transformation and/or recrystallization processes.…”

Section: ■ Introductionmentioning

confidence: 99%

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Tooeleite Transformation and Coupled As(III) Mobilization Are Induced by Fe(II) under Anoxic, Circumneutral Conditions

Choppala

Lamb

Aughterson

et al. 2022

Environ. Sci. Technol.

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Tooeleite [FeIII 6(AsIIIO3)4SO4(OH)4.4H2O] is an important As(III) host phase in diverse mining-impacted environments. Tooeleite has also received attention as a target phase for immobilizing As(III) in environmental and engineered settings. However, little is known regarding tooeleite’s environmental stability, with no previous research examining the possible role of Fe(II) in inducing tooeleite transformation (as occurs for Fe(III) oxide minerals). We investigated shifts in solid-phase Fe and As speciation and associated As mobilization into the aqueous phase during exposure of tooeleite to aqueous Fe(II) under anoxic conditions at pH 4 to 8. Our results demonstrate that environmentally relevant concentrations of aqueous Fe(II) (i.e., 1 to 10 mM) induce significant mobilization of As(III) from tooeleite under near-neutral pH conditions, with greater As(III) mobilization occurring at higher pH. Extended X-ray absorption fine structure spectroscopy at both the As and Fe K-edge reveals that the observed As(III) mobilization was coupled with partial Fe(II)-induced transformation of tooeleite to As(III)-bearing ferrihydrite at pH 6 to 8. These results provide new insights into the environmental stability of tooeleite and demonstrate a novel pathway for As(III) mobilization in tooeleite-bearing systems.

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Characterization of the dissolution of tooeleite under Acidithiobacillus ferrooxidans relevant to mineral trap for arsenic removal

Cited by 2 publications

References 18 publications

In situremediation of arsenic-rich mine tailings using slag zero valence iron

In situremediation of arsenic-rich mine tailings using slag zero valence iron

Tooeleite Transformation and Coupled As(III) Mobilization Are Induced by Fe(II) under Anoxic, Circumneutral Conditions

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