Bioleaching of Pyrrhotite with Bacterial Adaptation and Biological Oxidation for Iron Recovery

Kim, Bong-Ju; Koh, Yong–Kwon; Kwon, Jang-Soon

doi:10.3390/met11020295

Cited by 8 publications

(3 citation statements)

References 30 publications

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“…Studies in the literature have shown that bioleaching is efficient for the extraction of metals from water treatment sludge (Cr 92.6%, Cu 80.6%, Fe 95.6%, Mg 91%, Ni 89.7%, Pb 99.5%, Zn 93% [ 33 , 34 , 35 ], Fe 76.5%, Cu 82%, Pb 89.9%, Zn 90%) [ 31 ] or from municipal and industrial waste [ 36 ]. Pyrotite bioleaching could increase Fe recovery by bacterial adaptation and biological contact oxidation [ 37 ], and Fe can be removed (18%) by adding 9K medium [ 38 ].…”

Section: Introductionmentioning

confidence: 99%

Extraction of Metals from Polluted Soils by Bioleaching in Relation to Environmental Risk Assessment

et al. 2022

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Environmental pollution has particular implications for the whole geosystem and increases the global risk to human and ecological health. In this regard, investigations were carried out on soil samples to perform the quality status assessment by determining: pH, texture, structure and metal concentration, as well as carrying out an assessment of anthropogenic activity by determining pollution indices: Cf (contamination factor), Cd (degree of contamination), PLI (pollution load index), Er (ecological risk index) and PERI (potential ecological risk index). Analyses on soil samples showed high concentrations of metals (Cu: 113–2996 mg kg−1; Pb: 665–5466 mg kg−1; Cr: 40–187 mg kg−1; Ni: 221–1708 mg kg−1). The metal extraction experiments were carried out by bioleaching using Thiobacillus ferrooxidans, microorganisms at different amounts of bioleaching solution (20 mL and 40 mL 9K medium) and a stirring time of up to 12 h. The results on the degree of contamination, pollution loading index PLI (2.03–57.23) and potential ecological risk index PERI (165–2298) indicate that the soils in the studied area have a very high degree of pollution. The decontamination procedure by bioleaching showed a decrease, but at the end of the test (12 h), the followed indices indicate high values, suggesting that bioleaching should continue. The depollution yield after 12 h of treatment is, however, encouraging: Cu 29–76%, Pb: 10–32%, Cr: 39–72% and Ni 44–68%. The use of yield–time correlation equations allows the identification of the optimal exposure time on the bioleaching extraction process to obtain optimal results. The aim of the research is to determine the soil quality, soil environmental risk, extraction of metals from polluted soils by bioleaching and to identify influencing factors in achieving high remediation yields.

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Section: Introductionmentioning

confidence: 99%

Extraction of Metals from Polluted Soils by Bioleaching in Relation to Environmental Risk Assessment

et al. 2022

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“…However, oxygen solubility differs in various solutions. Iron ions are particularly important among various metal ions in the growth environment of A. ferrooxidans ( Kim et al, 2021 ). Fe 2+ is a necessary component of growth media from which Fe 3+ -rich leaching liquors are generated.…”

Section: Introductionmentioning

confidence: 99%

Saturated Dissolved Oxygen Concentration in in situ Fragmentation Bioleaching of Copper Sulfide Ores

et al. 2022

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In situ fragmentation bioleaching is a promising way to perform deep mining safely, economically, and in an environmentally friendly manner, where oxygen plays a critical role in microbial growth and mineral dissolution. However, the lack of oxygen limits the implementation of in-situ fragmentation bioleaching. To overcome this limitation, aeration was proposed, with saturated dissolved oxygen concentration as an important indicator. Orthogonal experiments were conducted to measure saturated dissolved oxygen concentration at various temperature, pH, and electrolyte (ferrous sulfate, ferric sulfate, copper sulfate, and sulfuric acid) concentration conditions. Experimental data were analyzed by Python programming language and least squares method to obtain a saturated dissolved oxygen concentration model. Results showed that temperature had the most significant effect on oxygen solubility, which was concluded by comparing the results of surface fitting based on the least squares method. At 30–40°C, the saturated dissolved oxygen concentration decreased faster as metal ions concentration increased. The conjoint effect of the five variables on oxygen solubility showed that pH was linearly negatively related to oxygen solubility. Additionally, a mathematical model was also proposed to predict the saturated dissolved oxygen concentration in in situ fragmentation bioleaching of copper sulfide ores. This work enables bioleaching processes to be modeled and controlled more effectively.

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“…mg/L)[40]. Sphalerite: ZnS + 0.5O 2 + H 2 SO 4 → ZnSO 4 + H 2 O + S (2) O 2 + 2H 2 SO 4 → 2Fe 2 (SO 4 ) 3 + 2H 2 O (7) (Zn Pb Fe Cu)S + Fe 2 (SO 4 ) 3 → (Zn Pb Fe Cu)SO 4 + 2FeSO 4 + S (8)…”

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confidence: 99%

A Comparative Study on Bioleaching Properties of Various Sulfide Minerals Using Acidiphilium cryptum

et al. 2023

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Bioleaching has been regarded as a green alternative to chemical leaching in metal extraction processes. In this study, the bioleaching properties of indigenous acidophilic bacteria for various sulfide minerals were compared and evaluated in terms of pH reduction and metal leaching. The primary minerals in the samples were sphalerite (ZnS) (SP), galena (PbS) (GN1 and GN2), pyrite (FeS2) (PY), and chalcopyrite (CuFeS2) (CCP), and an indigenous acidophilic bacterium, Acidiphilium cryptum (99.56%), was applied for bioleaching experiments. The metal extraction in bioleaching differed according to the mineral content. The leached metal concentration of Zn was higher than that of Pb for the SP sample with a high ZnS content, whereas the concentration of Pb was higher than that of Zn for the GN1 and GN2 samples with a high PbS content. Meanwhile, the leaching rate of Zn was faster than that of Pb for all samples. Corrosion action was observed on the surface of bacterial residues in SP and GN1 samples. These results show that the bioleaching mechanism based on sulfide minerals proceeds through indirect biological oxidation, chemical oxidation, and direct bacterial oxidation. The results of this study can provide basic research data for process optimization when employing bioleaching to extract valuable metals.

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Bioleaching of Pyrrhotite with Bacterial Adaptation and Biological Oxidation for Iron Recovery

Cited by 8 publications

References 30 publications

Extraction of Metals from Polluted Soils by Bioleaching in Relation to Environmental Risk Assessment

Extraction of Metals from Polluted Soils by Bioleaching in Relation to Environmental Risk Assessment

Saturated Dissolved Oxygen Concentration in in situ Fragmentation Bioleaching of Copper Sulfide Ores

A Comparative Study on Bioleaching Properties of Various Sulfide Minerals Using Acidiphilium cryptum

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