Leaching of a low grade hematitic laterite ore using fungi and biologically produced acid metabolites

Tzeferis, P.G.

doi:10.1016/0301-7516(94)00032-8

Cited by 45 publications

(26 citation statements)

References 8 publications

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“…The recovery of metal species from laterite nickel ores by microorganisms is mainly based on the use of organic acids as leaching agents and these are produced by filamentous fungi [3,[6][7][8][9][10][11][12]. However, the use of fungi suffers from certain limitations and these include: (i) the need to add organic compounds as a source of carbon and energy to culture the fungi, which increases the cost of future commercial processes [13], (ii) the formation of chelates, which hinders the recovery of dissolved metals [14] and decreases the amount of leached metals, (iii) the phenomenon of biosorption by the fungal biomass [12,[15][16][17] and (iv) electrosorption effects [18], i.e.…”

Section: Introductionmentioning

confidence: 99%

Different strategies for recovering metals from CARON process residue

Cabrera

Gómez

Hernández

et al. 2011

Journal of Hazardous Materials

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a b s t r a c tThe capacity of Acidithiobacillus thiooxidans DMS 11478 to recover the heavy metals contained in the residue obtained from the CARON process has been evaluated. Different bioreactor configurations were studied: a two-stage batch system and two semi-continuous systems (stirred-tank reactor leaching and column leaching). In the two-stage system, 46.8% Co, 36.0% Mg, 26.3% Mn and 22.3% Ni were solubilised after 6 h of contact between the residue and the bacteria-free bioacid. The results obtained with the stirred-tank reactor and the column were similar: 50% of the Mg and Co and 40% of the Mn and Ni were solubilised after thirty one days. The operation in the column reactor allowed the solid-liquid ratio to be increased and the pH to be kept at low values (<1.0). Recirculation of the leachate in the column had a positive effect on metal removal; at sixty five days (optimum time) the solubilisation levels were as follows: 86% Co, 83% Mg, 72% Mn and Ni, 62% Fe and 23% Cr. The results corroborate the feasibility of the systems studied for the leaching of metals from CARON process residue and these methodologies can be considered viable for the recovery of valuable metals.

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Section: Introductionmentioning

confidence: 99%

Different strategies for recovering metals from CARON process residue

Cabrera

Gómez

Hernández

et al. 2011

Journal of Hazardous Materials

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“…Not surprisingly, the main focus of these studies was on microbial iron(II) oxidation and reduced inorganic sulfur compound (RISC) oxidation, the two key microbial capabilities for metals extraction. At the same time, the possible exploitation of heterotrophic microorganisms in the leaching of oxidised silicate ores was tested [31][32][33] and the important roles of heterotrophic bacteria in bioleaching were studied [34,35].…”

Section: The Chemistry and Microbiology Of Mineral Dissolutionmentioning

confidence: 99%

“…Most of the bioleaching studies on laterites relate to bodies of research on Greek laterites that contain nickel, cobalt and chromium [32,76,[316][317][318], Indian laterites that contain nickel, cobalt and chromium [319][320][321][322][323], New Caledonian laterites that contain nickel, cobalt and manganese [33,[324][325][326][327][328][329][330] and African laterites that contain nickel, cobalt, manganese and chromium [77,331,332]. In metal extraction, the key difference between copper oxide or sulfide ores and nickel laterite ores is the absence of specific nickel phases in the lateritic ores [333].…”

Section: Oxidised Oresmentioning

confidence: 99%

“…• the need to provide large amounts of inexpensive sources of organic carbon for the production of the required organic acids in economic scaled-up processes [32,76,348];…”

Section: Leaching With Acidophilic Heterotrophs/organic Acidmentioning

confidence: 99%

“…• the need to restrict the use of the carbon source to acid-producing species and to prevent the biomass from inhibiting the metal extraction [32,77];…”

Section: Leaching With Acidophilic Heterotrophs/organic Acidmentioning

confidence: 99%

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Review of Biohydrometallurgical Metals Extraction from Polymetallic Mineral Resources

Watling

2014

Minerals

140

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This review has as its underlying premise the need to become proficient in delivering a suite of element or metal products from polymetallic ores to avoid the predicted exhaustion of key metals in demand in technological societies. Many technologies, proven or still to be developed, will assist in meeting the demands of the next generation for trace and rare metals, potentially including the broader application of biohydrometallurgy for the extraction of multiple metals from low-grade and complex ores. Developed biotechnologies that could be applied are briefly reviewed and some of the difficulties to be overcome highlighted. Examples of the bioleaching of polymetallic mineral resources using different combinations of those technologies are described for polymetallic sulfide concentrates, low-grade sulfide and oxidised ores. Three areas for further research are: (i) the development of sophisticated continuous vat bioreactors with additional controls; (ii) in situ and in stope bioleaching and the need to solve problems associated with microbial activity in that scenario; and (iii) the exploitation of sulfur-oxidising microorganisms that, under specific anaerobic leaching conditions, reduce and solubilise refractory iron(III) or manganese(IV) compounds containing multiple elements. Finally, with the successful applications of stirred tank bioleaching to a polymetallic tailings dump and heap bioleaching to a polymetallic black schist ore, there is no reason why those proven technologies should not be more widely applied.

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Characterization and bioleaching of nickel laterite ore using Bacillus subtilis strain

Giese

Carpen

Bertolino

et al. 2019

Biotechnology Progress

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There are two principal types of nickel (Ni) deposits: sulfide and laterite ores. Interest in low‐grade Ni‐laterite ores has increased in recent years as high‐grade Ni‐sulfide deposits are being quickly depleted. However, processing of Ni laterites has proven technically difficult and costly, and the development of alternative low‐cost biotechnologies for Ni solubilization has been encouraged. In this context, by the first time, a sample of Brazilian Ni‐laterite ore was analyzed mineralogically and subjected to bioleaching tests using a heterotrophic Bacillus subtilis strain. SEM‐analysis indicated that the primary Ni carrier mineral is goethite. Chemical analysis of different grain size fractions indicated a homogeneous distribution of Ni. XRF‐analysis showed that the ore consists mainly in lizardite (32.6% MgO) and contains1.0% NiO (0.85% Ni). Bioleaching batch experiments demonstrated that about 8.1% Ni (0.7 mg Ni/g ore) were solubilized by the B. subtilis after 7 days. Application of microwave heating as a Ni‐laterite pretreatment was also tested. This pretreatment increased the bioextraction of Ni from 8% to 26% (2.3 mg Ni g−1 ore).

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Leaching of a low grade hematitic laterite ore using fungi and biologically produced acid metabolites

Cited by 45 publications

References 8 publications

Different strategies for recovering metals from CARON process residue

Different strategies for recovering metals from CARON process residue

Review of Biohydrometallurgical Metals Extraction from Polymetallic Mineral Resources

Characterization and bioleaching of nickel laterite ore using Bacillus subtilis strain

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