Removal and fixation of arsenic in the form of ferric arsenates. Three parallel experimental studies

Papassiopi, Nymphodora; Vircikova, E.; Nenov, Valentin; Kontopoulos, A.; Molnar, L.

doi:10.1016/0304-386x(95)00059-p

Cited by 31 publications

(9 citation statements)

References 6 publications

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“…The amorphous As-Fe phases in the Nakdong mine tailings likely would be subject to the same processes that lead to the environmental releases of As when exposed to water seepages. Formation of As and Fe solid phases has been a means of removing As from metallurgical effluents (Papassiopi et al 1996). However, As might be remobilized under alkaline conditions owing to the pH dependence of sorption reactions and iron arsenates are unstable if the molar ratio Fe/As was less than 2.…”

Section: Implication For Environmental Releases Of Arsenic From Tailimentioning

confidence: 99%

Mineralogical and geochemical characterization of arsenic in an abandoned mine tailings of Korea

Ahn

Park

Kim

et al. 2005

Environ Geochem Health

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The mineralogical and chemical characteristics of As solid phases in arsenic-rich mine tailings from the Nakdong As-Bi mine in Korea was investigated. The tailings generated from the ore roasting process contained 4.36% of As whereas the concentration was up to 20.2% in some tailings from the cyanidation process for the Au extraction. Thin indurated layers and other secondary precipitates had formed at the surfaces of the tailings piles and the As contents of the hardened layers varied from 2.87 to 16.0%. Scorodite and iron arsenate (Fe3AsO7) were the primary As-bearing crystalline minerals. Others such as arsenolamprite, bernardite and titanium oxide arsenate were also found. The amorphous As-Fe phases often showed framboidal aggregates and gel type textures with desiccation cracks. Sequential extraction results also showed that 55.7-91.1% of the As in tailings were NH(4)-oxalate extractable As, further confirmed the predominance of amorphous As-Fe solid phases. When the tailings were equilibrated with de-ionized water, the solution exhibited extremely acidic conditions (pH 2.01-3.10) and high concentrations of dissolved As (up to 29.5 mg L(-1)), indicating high potentials for As to be released during rainfall events. The downstream water was affected by drainage from tailings and contained 12.7-522 microg L(-1) of As. The amorphous As-Fe phases in tailings have not entirely been stabilized through the long term natural weathering processes. To remediate the environmental harms they had caused, anthropogenic interventions to stabilize or immobilize As in the tailings pile should be explored.

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Section: Implication For Environmental Releases Of Arsenic From Tailimentioning

confidence: 99%

Mineralogical and geochemical characterization of arsenic in an abandoned mine tailings of Korea

Ahn

Park

Kim

et al. 2005

Environ Geochem Health

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“…Removal of arsenic with chemical precipitation is currently the most common methods. Traditional precipitants like ferric salt [5], lime [6] and sulfide [7] show good performance. Combination of lime neutralization with ferric iron coagulation is also commonly used for removing As in industrial applications [1].…”

Section: Introductionmentioning

confidence: 98%

A novel strategy for arsenic removal from dirty acid wastewater via CaCO3-Ca(OH)2-Fe(III) processing

Lü

Chen

et al. 2016

Journal of Water Process Engineering

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“…11 This unknown compound was observed to form under hydrothermal conditions relevant to pressure leaching of refractory gold and copper mineral feedstocks. 11,[12][13][14][15]18,20,[24][25] Of particular interest was the environmental stability (arsenic control) of this intriguing unknown phase. In the original work, 11 it was postulated from the XRD and TEM data that this ''Type 2'' phase may be of a tetragonal or monoclinic nature but structurally distinct to BFS.…”

Section: Introductionmentioning

confidence: 99%

The nature of synthetic basic ferric arsenate sulfate (Fe(AsO4)1−x(SO4)x(OH)x) and basic ferric sulfate (FeOHSO4): their crystallographic, molecular and electronic structure with applications in the environment and energy

et al. 2013

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Removal and fixation of arsenic in the form of ferric arsenates. Three parallel experimental studies

Cited by 31 publications

References 6 publications

Mineralogical and geochemical characterization of arsenic in an abandoned mine tailings of Korea

Mineralogical and geochemical characterization of arsenic in an abandoned mine tailings of Korea

A novel strategy for arsenic removal from dirty acid wastewater via CaCO3-Ca(OH)2-Fe(III) processing

The nature of synthetic basic ferric arsenate sulfate (Fe(AsO4)1−x(SO4)x(OH)x) and basic ferric sulfate (FeOHSO4): their crystallographic, molecular and electronic structure with applications in the environment and energy

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