Effectiveness of iron reducing bacteria for the removal of iron from bauxite ores

Papassiopi, Nymphodora; Vaxevanidou, K.; Paspaliaris, Ioannis

doi:10.1016/j.mineng.2009.09.005

Cited by 52 publications

(26 citation statements)

References 19 publications

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“…A microbial community containing autotrophic dissimilative reducers of As and SO 4 was shown to promote the dissolution of As-bearing Fe(III) hydroxides, pharmacosiderite, arseniosiderite, and the precipitation of realgar in a natural Au-As geochemical anomaly at Mokrsko, Czech Republic [69]. Dissimilatory Fe(III)-reducing bacteria such as Shewanella alga and Desulfuromonoas palmitatis have also been shown to reduce scorodite, releasing dissolved arsenate [70,71] and in some cases, producing secondary symplesite [71].…”

Section: Arsenic-microbe-mineral Interactions In Mining-affected Envimentioning

confidence: 99%

Arsenic-Microbe-Mineral Interactions in Mining-Affected Environments

Hudson‐Edwards

Santini

2013

Minerals

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Abstract:The toxic element arsenic (As) occurs widely in solid and liquid mine wastes. Aqueous forms of arsenic are taken up in As-bearing sulfides, arsenides, sulfosalts, oxides, oxyhydroxides, Fe-oxides, -hydroxides, -oxyhydroxides and -sulfates, and Fe-, Ca-Fe-and other arsenates. Although a considerable body of research has demonstrated that microbes play a significant role in the precipitation and dissolution of these As-bearing minerals, and in the alteration of the redox state of As, in natural and simulated mining environments, the molecular-scale mechanisms of these interactions are still not well understood. Further research is required using traditional and novel mineralogical, spectroscopic and microbiological techniques to further advance this field, and to help design remediation schemes.

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Section: Arsenic-microbe-mineral Interactions In Mining-affected Envimentioning

confidence: 99%

Arsenic-Microbe-Mineral Interactions in Mining-Affected Environments

Hudson‐Edwards

Santini

2013

Minerals

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“…Papassiopi et al [9] developed a method involving microbial dissolution, by which the dissolution ratio of Fe from amorphous Fe 2 O 3 reached up to 95%; however, only 9% Fe could be leached out in crystal form. Li et al [8] proposed an amazing method to convert hematite into magnetite for removing iron.…”

Section: Introductionmentioning

confidence: 99%

Promote Alumina Leaching through Re-Pelleting: Effects of Directional Coating of Calcite on Silicate Grains

Hu¹,

Qiu²,

Wei³

et al. 2018

Minerals

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Abstract:The contents of Fe and SiO 2 in ferric bauxite are much higher than that in regular bauxite, and the leaching yield of Al 2 O 3 from ferric bauxite cannot reach the general level of ordinary ores, even under optimal conditions. This paper introduces a pretreatment method to enhance sintering before leaching. First, mixing followed by grinding was found to be more efficient than grinding followed by mixing as a pretreatment method by forming a directional coating structure of CaCO 3 on the SiO 2 surface. Second, leaching yields increased grinding fineness because CaCO 3 grain uniformity could be improved with the latter method. Finally, the leaching yields were increased by pulp consistency under certain conditions, as evidenced by improvements in CaCO 3 uniformity, bulk density, and Al 2 O 3 grain size, which parameters were beneficial to enhance leaching. The leaching yield of Al 2 O 3 was increased from 75.2% to 87.15% by using the proposed mixing-grinding method with the leaching agent of water.

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“…Iron-rich diasporic bauxite ore, usually containing over 15 wt. % iron oxide [3][4][5], has huge reserves in Australia, Guinea, Brazil, Vietnam, Laos and China [6], but has not yet been exploited to its full potential.…”

Section: Introductionmentioning

confidence: 99%

“…Many studies have been conducted to separate iron constituents from the iron-rich bauxite by using physical methods [3,11], pyro-and hydro-metallurgical processes [5,[12][13][14], and bio-leaching methods [4,15]. Generally, it is difficult to achieve the sufficient separation of iron due to the complex occurrences and associations of disseminated iron-, aluminum-, and silicon-bearing minerals.…”

Section: Introductionmentioning

confidence: 99%

“…During the alkali roasting, the reaction of sodium aluminosilicate hydrate in red mud with Na 2 CO 3 forms NaAlO 2 , due to the conversion of SiO 2 into CaSiO 3 via the addition of CaO-bearing substances [23][24][25]. However, during the reductive roasting of high aluminum and silicon ores with sodium salts, but without CaO, the 4 , which are not dissolved in water [9,18]. Moreover, there is lack of research on the alumina extraction from these materials with various sodium aluminates and aluminosilicates, and the effectiveness of alumina extraction has been unclear heretofore.…”

Section: Introductionmentioning

confidence: 99%

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Digestion of Alumina from Non-Magnetic Material Obtained from Magnetic Separation of Reduced Iron-Rich Diasporic Bauxite with Sodium Salts

Jiang

et al. 2016

Metals

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Abstract:Recovery of iron from iron-rich diasporic bauxite ore via reductive roasting followed by magnetic separation has been explored recently. However, the efficiency of alumina extraction in the non-magnetic materials is absent. In this paper, a further study on the digestion of alumina by the Bayer process from non-magnetic material obtained after magnetic separation of reduced iron-rich diasporic bauxite with sodium salts was investigated. The results indicate that the addition of sodium salts can destroy the original occurrences of iron-, aluminum-and silicon-containing minerals of bauxite ore during reductive roasting. Meanwhile, the reactions of sodium salts with complex aluminum-and silicon-bearing phases generate diaoyudaoite and sodium aluminosilicate. The separation of iron via reductive roasting of bauxite ore with sodium salts followed by magnetic separation improves alumina digestion in the Bayer process. When the alumina-bearing material in bauxite ore is converted into non-magnetic material, the digestion temperature decreases significantly from 280 • C to 240 • C with a nearly 99% relative digestion ratio of alumina.

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Effectiveness of iron reducing bacteria for the removal of iron from bauxite ores

Cited by 52 publications

References 19 publications

Arsenic-Microbe-Mineral Interactions in Mining-Affected Environments

Arsenic-Microbe-Mineral Interactions in Mining-Affected Environments

Promote Alumina Leaching through Re-Pelleting: Effects of Directional Coating of Calcite on Silicate Grains

Digestion of Alumina from Non-Magnetic Material Obtained from Magnetic Separation of Reduced Iron-Rich Diasporic Bauxite with Sodium Salts

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