Minerals bioprocessing: R &amp; D needs in mineral biobeneficiation

Rao, K. Hanumantha; Vilinska, Annamaria; Чернышова, И. В.

doi:10.1016/j.hydromet.2010.01.016

Cited by 48 publications

(24 citation statements)

References 34 publications

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“…[35] Microorganisms have a tremendous influence on their environment through the transfer of energy, charge, and materials across a complex biotic mineral-solution interface. The biomodification of mineral surfaces involves the complex action of microorganism on the mineral surface [39]. The manner in which bacteria affect the surface reactivity and the mechanism of bacteria adsorption has been unknown and accumulation of the primary data in this area was started.…”

Section: The Separation Process Applied To the Areamentioning

confidence: 99%

Flotation of Biological Materials

Kyzas

Matis

2014

Processes

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Flotation constitutes a gravity separation process, which originated from the minerals processing field. However, it has, nowadays, found several other applications, as for example in the wastewater treatment field. Concerning the necessary bubble generation method, typically dispersed-air or dissolved-air flotation was mainly used. Various types of biological materials were tested and floated efficiently, such as bacteria, fungi, yeasts, activated sludge, grape stalks, etc. Innovative processes have been studied in our Laboratory, particularly for metal ions removal, involving the initial abstraction of heavy metal ions onto a sorbent (including a biosorbent): in the first, the application of a flotation stage followed for the efficient downstream separation of metal-laden particles. The ability of microorganisms to remove metal ions from dilute aqueous solutions (as most wastewaters are) is a well-known property. The second separation process, also applied effectively, was a new hybrid cell of microfiltration combined with flotation. Sustainability in this field and its significance for the chemical and process industry is commented.

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Section: The Separation Process Applied To the Areamentioning

confidence: 99%

Flotation of Biological Materials

Kyzas

Matis

2014

Processes

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“…Bioflotation is being thoroughly investigated, at the lab-scale, as an efficient, cost effective, environmentally friendly alternative to traditional froth flotation [9][10][11]. The bacterium Acidithiobacillus ferrooxidans has been of great interest to researchers as one of the most promising microbes for applications in bioflotation [11][12][13][14][15]. It is a non-pathogenic bacterium naturally found in areas where acid mine drainage occurs, utilizing ferrous iron and sulfur from the dissolution of sulfide minerals as sources of nutrients [11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

“…The bacterium Acidithiobacillus ferrooxidans has been of great interest to researchers as one of the most promising microbes for applications in bioflotation [11][12][13][14][15]. It is a non-pathogenic bacterium naturally found in areas where acid mine drainage occurs, utilizing ferrous iron and sulfur from the dissolution of sulfide minerals as sources of nutrients [11][12][13][14][15]. Three mechanisms describing the interaction of bacteria with sulfide minerals have been suggested: direct contact; indirect contact; and non-contact [16,17].…”

Section: Introductionmentioning

confidence: 99%

Surface Chemical Characterisation of Pyrite Exposed to Acidithiobacillus ferrooxidans and Associated Extracellular Polymeric Substances

et al. 2018

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A. ferrooxidans and their metabolic products have previously been explored as a viable alternative depressant of pyrite for froth flotation; however, the mechanism by which separation is achieved is not completely understood. Scanning electron microscopy (SEM), photoemission electron microscopy (PEEM), time-of-flight secondary ion mass spectrometry (ToF-SIMS) and captive bubble contact angle measurements have been used to examine the surface physicochemical properties of pyrite upon exposure to A. ferrooxidans grown in HH medium at pH 1.8. C K-edge near edge X-ray absorption fine structure (NEXAFS) spectra collected from PEEM images indicate hydrophilic lipids, fatty acids and biopolymers are formed at the mineral surface during early exposure. After 168 h, the spectra indicate a shift towards protein and DNA, corresponding to an increase in cell population and biofilm formation on the surface, as observed by SEM. The Fe Ledge NEXAFS show gradual oxidation of the mineral surface from Fe(II) sulfide to Fe(III) oxyhydroxides. The oxidation of the iron species at the pyrite surface is accelerated in the presence of A. ferrooxidans and extracellular polymeric substances (EPS) as compared to HH medium controls. The surface chemical changes induced by the interaction with A. ferrooxidans show a significant decrease in surface hydrophobicity within the first 2 h of exposure. The implications of these findings are the potential use of EPS produced during early attachment of A. ferrooxidans, as a depressant for bioflotation.

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“…Although there are a number of studies related to the direct application of microorganisms in flotation and flocculation of minerals which are well reviewed by Hanumantha Rao et al [11] and Khoshdast and Sam [12], few scientific researches which apply biosurfactants have been found. The only available work on using rhamnolipid biosurfactants in flotation of coal and minerals was done by Fazaelipoor et al [13].…”

Section: Introductionmentioning

confidence: 99%

An Efficiency Evaluation of Iron Concentrates Flotation Using Rhamnolipid Biosurfactant as a Frothing Reagent

Khoshdast¹,

Sam²

2012

Environmental Engineering Research

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The effect of a rhamnolipid biosurfactant produced by a Pseudomonas aeruginosa MA01 strain on desulfurization of iron concentrates was studied. Surface tension measurement and frothing characterization indicated better surface activity and frothability of rhamnolipid compared to methyl isobutyl carbinol (MIBC) as an operating frother. Reverse flotation tests using rhamnolipid either as a sole frother or mixed with MIBC, showed that the desulfurization process is more efficient at pH 4.5 and high concentration of rhamnolipid in the presence of MIBC. However, under these conditions water recovery decreased due to the change in rhamnolipid aggregates morphology. Results from the present study seemed promising to introduce the biosurfactant from Pseudomonas aeruginosa as a new frother.

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Minerals bioprocessing: R & D needs in mineral biobeneficiation

Cited by 48 publications

References 34 publications

Flotation of Biological Materials

Flotation of Biological Materials

Surface Chemical Characterisation of Pyrite Exposed to Acidithiobacillus ferrooxidans and Associated Extracellular Polymeric Substances

An Efficiency Evaluation of Iron Concentrates Flotation Using Rhamnolipid Biosurfactant as a Frothing Reagent

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