Bioleaching Coal Gangue with a Mixed Culture of Acidithiobacillus ferrooxidans and Acidithiobacillus thiooxidans

Chen, Zihao; Huang, Xin; He, Huan; Tang, Jielin; Tao, Xiuxiang; Huang, Huazhou; Haider, Rizwan; Ali, Muhammad Ishtiaq; Jamal, A. Rahman A.; Huang, Zaixing

doi:10.3390/min11101043

Cited by 10 publications

(5 citation statements)

References 46 publications

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“…To reduce the impact of soluble impurities in the coal sample on the microbial desulfurization effect, it is necessary to pretreat the coal sample ( Chen et al, 2021 ; Rout et al, 2022 ), the steps were shown in Figure 3 . Appropriate amount of coal sample was put into a beaker with sulfuric acid solution with pH = 1.5, soaked at room temperature for 24 h, filtered and washed with distilled water until the solution was neutral, dried and sealed for storage.…”

Section: Experimental Materials and Methodsmentioning

confidence: 99%

“… Xu et al (2022) used Nocardia mangyaensis and Pseudomonas putida to remove organic sulfur from coal, and the organic sulfur removal of these two bacterial strains on high-sulfur coal were 61.58 and 54.19%, respectively. Chen et al (2021) used the mixed culture of A. ferrooxidans and A. thiooxidans to bioleach coal gangue in a column reactor, and the desulfurization rates of the pyrite and sulfate were 78.79 and 49.02%. The biological method can effectively remove sulfur from coal, but the mechanism of interaction between microorganisms and coal, reaction kinetics and the change law of physical and chemical properties of coal still need further study.…”

Section: Introductionmentioning

confidence: 99%

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Study on the experiment and reaction kinetics of sulfur removal from coal by microorganisms

Zhao

Sun

et al. 2023

Front. Microbiol.

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To solve the safety problem of spontaneous combustion of high-sulfur coal, applied microbiology, physical chemistry, reaction kinetics theory, combined with the SEM, FTIR and TG-DTG-DSC experiments and analysis of testing methods, the microbial desulfurization experiments were carried out, and the change law of the desulfurization reaction of coal before and after the element composition, main physical and chemical properties, the coal spontaneous combustion point was studied. The results show that when the temperature is 30°C, the coal particle size is 120 mesh, the initial pH value is 2.0 and the bacteria liquid amount is 15 mL, the desulfurization effect of the coal sample is the best, and the maximum desulfurization rate can reach 75.12%. There is obvious erosion on the surface of the coal sample after microbial desulfurization, the pyrite in the coal is obviously reduced, and the molecular structure in the coal is basically unchanged. Under the action of microorganism, part of inorganic sulfur in coal is removed, the spontaneous combustion point of coal is increased by 50°C, the activation energy of coal has increased more than three times, and the possibility of spontaneous combustion of coal is reduced. By analyzing the reaction kinetics of the microbial desulfurization process, it can be seen that the microbial desulfurization reaction is controlled by external diffusion, internal diffusion and chemical reaction, among which internal diffusion is the main influencing factor.

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Section: Experimental Materials and Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study on the experiment and reaction kinetics of sulfur removal from coal by microorganisms

Zhao

Sun

et al. 2023

Front. Microbiol.

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“…On the other hand, microbes mold a microbial modification film on the surface of mineral particles, altering their electrochemical characteristics, facilitating the flow of electrons during the reaction, and speeding up the reaction. 114 The effects of Acidithiobacillus ferrooxidans on the dissolving reaction of OMN and low-grade nickel sulfide ore in mild acid medium, as well as the synergistic corrosion of both, were thoroughly investigated by Kang et al 72 Figure 11 shows the main cell effect that results from the reductive leaching of OMN in contact with low-grade nickel sulfide ore in the same weak acid corrosion environment. A. ferrooxidans encourages the electric pair cycling of MnO 2 /Mn 2+ and Fe 3+ /Fe 2+ during the reduction leaching of OMN, which predominantly includes the reduction of Mn (IV) oxide and Fe (III) oxide.…”

Section: Corrosive Cell Effect Of Bioleachingmentioning

confidence: 99%

“… 113 On the one hand, the presence of microorganisms accelerates the indirect process of oxidative degradation of sulfide minerals by enhancing the conversion of Fe 2+ to Fe 3+ . On the other hand, microbes mold a microbial modification film on the surface of mineral particles, altering their electrochemical characteristics, facilitating the flow of electrons during the reaction, and speeding up the reaction 114 …”

Section: Progress and Mechanismsmentioning

confidence: 99%

Bioleaching of oceanic manganese nodules: Current progress and future prospects

Xue

Feng

et al. 2023

Asia-Pacific J Chem Eng

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The extraction of manganese elements and other strategic elements from oceanic manganese nodules has become a strategic decision to ensure the security of global metal resources and the high‐quality green development of metal resource processing and metallurgy industry due to the gradual depletion of high‐quality terrestrial metal resources and the increase of difficult‐to‐select and difficult‐to‐smelt deposits. In order to achieve the enrichment and separation of diverse elements within oceanic manganese nodules, it is imperative to initiate chemical reactions that facilitate the breakdown of complex oxides, particularly manganese dioxide. Bioleaching is a viable treatment option for oceanic manganese nodules with low operating costs and environmental damage. However, the mechanism of oceanic manganese nodules bioleaching is not fully studied, and the prospect of technology development is uncertain. We have reviewed five influencing factors on bioleaching of oceanic manganese nodules: mineralogical characteristics, chemical reaction equilibrium, thermodynamic characteristics, microbial properties, and operational variables. It then makes new development recommendations and technological system suggestions for the future improvement of oceanic manganese nodule bioleaching, primarily focusing on the development of new technologies for challenging to select and difficult to smelt ores, the practicality of strategic energy metal development, the cell design and its materials revolution, environmental protection and management, and all‐round resource utilization. Solving the above critical technical issues will boost the high‐quality development of metal industry and environmental protection.

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“…Moreover, the presence of pyrite in coal gangue increases the risk of spontaneous combustion as sulfur easily oxidizes, further hindering comprehensive utilization [5,6]. On one hand, high-sulfur pyrite can be utilized for economic benefits through sulfuric acid production [7]. On the other hand, tailings devoid or containing minimal amounts of pyrite can be employed in building material manufacturing [8].…”

Section: Introductionmentioning

confidence: 99%

Study on the Influence of Particle Size Distribution on the Separation of Pyrite from Coal Gangue by Jigging

Hou,

Xi,

Wang

et al. 2024

Coatings

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The presence of pyrite poses a significant impediment to the comprehensive utilization of coal gangue, which is a prevalent solid waste in industrial production. However, the current efficacy of jig separation for pyrite in fine-grade coal gangue remains unsatisfactory. To investigate the influence of particle size distribution on the jig separation of pyrite in fine-grade coal gangue, the raw material was crushed to less than 2 mm using a jaw crusher and subsequently sieved to obtain its particle size distribution curve. Upon fitting the curve, it was observed that it tends towards the Rosin-Rammler (RRSB) and Fuller distributions. Leveraging these two-parameter distribution curves, adjustments were made to determine the mass within each particle size range before conducting thorough mixing followed by jig separation. The results indicate that for fine-grade gangue particles smaller than 2 mm, the RRSB distribution with a uniformity coefficient of n = 0.85 exhibits the most effective separation, although it is comparable to the separation achieved using the size distribution of raw ore. On the other hand, employing the Fuller distribution with modulus of distribution q = 1.5 yields superior separation performance. In comparison to the raw ore, the concentrate shows an increase in sulfur (S) and iron (Fe) content by factors of 3.4 and 2.4, respectively. Furthermore, compared to the RRSB distribution, there is an increase in S and Fe content by 1.91% and 2.30%, respectively; the contents of S and Fe in tailings is 0.71% and 2.72%, which can be directly used as raw materials for coating materials. Therefore, for fine-grade coal gangue particles, jigging under the Fuller distribution demonstrates better effectiveness than under the RRSB distribution.

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Bioleaching Coal Gangue with a Mixed Culture of Acidithiobacillus ferrooxidans and Acidithiobacillus thiooxidans

Cited by 10 publications

References 46 publications

Study on the experiment and reaction kinetics of sulfur removal from coal by microorganisms

Study on the experiment and reaction kinetics of sulfur removal from coal by microorganisms

Bioleaching of oceanic manganese nodules: Current progress and future prospects

Study on the Influence of Particle Size Distribution on the Separation of Pyrite from Coal Gangue by Jigging

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