Depression of pyrite in the flotation of high pyrite low-grade lead–zinc ore using Acidithiobacillus ferrooxidans

Mehrabani, Javad Vazifeh; Noaparast, Mohammad; Mousavi, Seyyed Mohammad; Dehghan, R.; Rasooli, E.; Hajizadeh, H.

doi:10.1016/j.mineng.2009.08.008

Cited by 33 publications

(16 citation statements)

References 10 publications

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“…The analysis of X-ray diffraction (XRD) indicates that the lead accumulated in the char is in the form of Pb and PbO (Fig. S1 of Supplementary material), and the Pb concentrations in the chars are in the range of 5.39-7.53 wt.%, so the chars can be used as lead ore resource and their toxic nature to the organism surrounded is well avoided (Mehrabani et al, 2010;Rehman et al, 2009). For the bio-oils, the Pb concentrations are only 2.9-13.8 mg kg À1 (2.9-13.8 Â 10 À4 wt.%), which are in the level of Pb contents in unleaded petrol (about 5 mg kg À1 in China, GB17930-1999).…”

Section: Influence Of Pyrolysis Temperature On Product Yields and Commentioning

confidence: 99%

Techno-economic evaluation of the integrated biosorption–pyrolysis technology for lead (Pb) recovery from aqueous solution

Liu

Zeng

Jiang

et al. 2011

Bioresource Technology

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Section: Influence Of Pyrolysis Temperature On Product Yields and Commentioning

confidence: 99%

Techno-economic evaluation of the integrated biosorption–pyrolysis technology for lead (Pb) recovery from aqueous solution

Liu

Zeng

Jiang

et al. 2011

Bioresource Technology

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“…Pyrite (FeS 2 ) is the main gangue associated with valuable sulfide ores, such as galena, chalcopyrite, sphalerite, and others [1][2][3][4][5]. Pyrite is usually depressed during the flotation of sulfide minerals [6] by the use of a depressant [4,7], pulp-environment management [8,9], and grinding-environment changes [10,11].…”

Section: Introductionmentioning

confidence: 99%

Selective Flotation of Pyrite from Galena Using Chitosan with Different Molecular Weights

Zhang

Sun

et al. 2019

Minerals

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Pyrite is a major gangue mineral associated with galena and other valuable minerals, and it is necessary to selectively remove pyrite to upgrade the lead concentrate by froth flotation. In this study, the flotation experiments of a single mineral and mixed minerals were performed using chitosan with different molecular weights (MW = 2−3, 3−6, 10 and 100 kDa) as a depressant, ethyl xanthate as a collector, and terpineol as a frother, in a bid to testify the separation of pyrite from galena. Flotation results showed that the selective flotation of pyrite from galena can be achieved under the preferred reagent scheme, i.e., 400 g/t chitosan (10 kDa), 1600 g/t ethyl xanthate, and 100 g/t terpineol, while chitosan with other molecular weights cannot. Furthermore, the results of the zeta potential and contact angle measurements revealed that chitosan (10 kDa) has a strong adsorption on galena yet a very weak adsorption on pyrite at the dosage of 400 g/t. This study showed that chitosan (10 kDa) has great potential in the industrial flotation separation of pyrite from lead concentrates.

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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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Depression of pyrite in the flotation of high pyrite low-grade lead–zinc ore using Acidithiobacillus ferrooxidans

Cited by 33 publications

References 10 publications

Techno-economic evaluation of the integrated biosorption–pyrolysis technology for lead (Pb) recovery from aqueous solution

Techno-economic evaluation of the integrated biosorption–pyrolysis technology for lead (Pb) recovery from aqueous solution

Selective Flotation of Pyrite from Galena Using Chitosan with Different Molecular Weights

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

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