Chemical oxidation kinetics of pyrite in bioleaching processes

Boon, Mieke; Heijnen, Joseph J.

doi:10.1016/s0304-386x(97)00072-8

Cited by 78 publications

(27 citation statements)

References 6 publications

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“…Acidithiobacillus develop various ecological niches and adapt to specific oxidation substrates, and they are characterized by different growth rates, tolerance to heavy metal ions, and activities of ferrous iron and/or sulfide mineral oxidation (Yana et al 2010;Chen et al 2011). A. f can oxidize ferrous iron (Boon and Heijnen 1998;Ebrahimi et al 2003;Dumett and Keener 2014). Due to these characteristics of the A. f, the current study therefore has used the A. f for bioleaching the pyrites.…”

Section: Discussionmentioning

confidence: 97%

Effects of pyrite bioleaching solution of Acidithiobacillus ferrooxidans on viability, differentiation and mineralization potentials of rat osteoblasts

Zhou

Chen²,

Zhi

et al. 2015

Arch. Pharm. Res.

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Iron pyrite, an important component of traditional Chinese medicine, has a poor solubility, bioavailability, and patient compliance due to a high dose required and associated side effects, all of which have limited its clinical applications and experimental studies on its action mechanisms in improving fracture healing. This study investigated Acidithiobacillus ferrooxidans (A.f)-bioleaching of two kinds of pyrites and examined bioactivities of the derived solutions in viability and osteogenic differentiation in rat calvarial osteoblasts. A.f bioleaching improved element contents (Fe, Mn, Zn, Cu, and Se) in the derived solutions and the solutions concentration-dependently affected osteoblast viability and differentiation. While the solutions had no effects at low concentrations and inhibited the osteoblast alkaline phosphatase (ALP) activity at high concentrations, they improved ALP activity at their optimal concentrations. The improved osteoblast differentiation and osteogenic function at optimal concentrations were also revealed by levels of ALP cytochemical staining, calcium deposition, numbers and areas of mineralized nodules formed, mRNA and protein expression levels of osteogenesis-related genes (osteocalcin, Bmp-2, Runx-2, and IGF-1), and Runx-2 nuclear translocation. Data from this study will be useful in offering new strategies for improving pyrite bioavailability and providing a mechanistic explanation for the beneficial effects of pyrite in improving bone healing.

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Section: Discussionmentioning

confidence: 97%

Effects of pyrite bioleaching solution of Acidithiobacillus ferrooxidans on viability, differentiation and mineralization potentials of rat osteoblasts

Zhou

Chen²,

Zhi

et al. 2015

Arch. Pharm. Res.

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“…According to the Nernst equation (Eq. 1) (Boon and Heijnen 1998;Peng et al 2009), the dynamic change of redox potential is mainly related to Fe 3+ /Fe 2+ ratio (Fig. 3b).…”

Section: Dynamic Variation In Flask Experimentsmentioning

confidence: 97%

Bioleaching of multiple heavy metals from contaminated sediment by mesophile consortium

Gan

Zhou

et al. 2014

Environ Sci Pollut Res

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A defined mesophile consortium including Acidithiobacillus ferrooxidans, Acidithiobacillus thiooxidans, and Leptospirilum ferriphilum was applied in bioleaching sediments contaminated with multiple heavy metals. Flask experiments showed that sulfur favored the acidification in the early stage while pyrite led to a great acidification potential in the later stage. An equal sulfur/pyrite ratio got the best acidification effect. Substrate utilization started with sulfur in the early stage, and then the pH decline and the community shift give rise to the utilization of pyrite. Solubilization efficiency of Zn, Cu, Mn, and Cd reached 96.1, 93.3, 92.13, and 87.65%, respectively. Bioleaching efficiency of other elements (As, Hg, Pb) was not more than 30%. Heavy metal solubilization was highly negatively correlated with pH variation. Logistic models were well fitted with the solubilization efficiency, which can be used to predict the bioleaching process. The dominant species in the early stage of bioleaching were A. ferrooxidans and A. thiooxidans, and the abundance of L. ferriphilum increased together with pyrite utilization and pH decline.

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“…The advantages of this process are low energy consumption and environment friendliness [9]. In the last decade, extensive efforts have been made to expand bioleaching technology to minerals, since the bioleaching of sulfide occurs via two steps: the chemical oxidation of the sulfide by Fe 3+ and the bacterial regeneration of Fe 3+ as leaching agent [10,11]. However, few studies have been reported for the bacterial oxidation process of cinnabar.…”

Section: Introductionmentioning

confidence: 99%