Green Extraction of Heavy Metals from Tetrahedrite-Rich Concentrates Using Mechanical Activation-Assisted Bioleaching

Aghazadeh, Sajjad; Abdollahi, Hadi; Gharabaghi, Mahdi; Mirmohammadi, Mirsaleh

doi:10.1007/s40831-023-00675-4

Cited by 1 publication

(1 citation statement)

References 97 publications

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“…Within the first 6 d, both the control and microbial groups experienced an increase in ORP values, with the microbial group reaching the highest value of 164 mV, and then continued to decrease, finally recovering slightly after 15 d. The ORP of the control group peaked at 120 mV on the 9th day, and then steadily decreased. Generally, ORP is typically considered a critical factor in controlling the leaching rate in certain bioleaching systems [23,24], with higher values indicating enhanced microbial efficiency [24,25]. In the microbial group, the trend of ORP correlated with the mercury leaching rate, increasing until 6 days and declining thereafter, likely due to decreased microbial activity at that stage.…”

Section: Analysis Of Ph Orp Ec and Total Hg Content During Bioleachin...mentioning

confidence: 99%

Bioleaching Mercury from Coal with Aspergillus flavus M-3

Mao,

Mei,

et al. 2023

Microorganisms

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This study focuses on the utilization of Aspergillus flavus(M-3) for the bioleaching mercury from coal, offering an alternative and environmentally to its clean utilization. The fungus was isolated from the soil near a high mercury coal mine in Lao Ying Shan (LYS), Guizhou. Utilizing direct mercury analysis, X-ray diffraction (XRD), and Fourier Transform-Infrared (FT-IR) analysis techniques, the transformation of mercury speciation, mineral components, and organic groups in the coal were analyzed before and after the bioleaching process. The findings of the study illustrated that the fungus M-3 exhibited a remarkable capacity for coal bioliquefaction and mercury leaching from LYS coal. Following a 15-day bioleaching process, a remarkable mercury leaching rate of 83.79% was achieved. Various forms of mercury speciation, including residue, organic matter, sulfide-bound, oxide-bound, exchangeable, and carbonate-bound forms, were released from the coal, with leaching rates ranging from 80.41% to 92.60%. XRD analysis indicated that the M-3 strain facilitated the dissolution of coal pyrite and the degradation of macromolecules, effectively loosening the coal structure. FT-IR analysis of raw and residual coal demonstrated the breakdown of the aromatic ring structure and introduced oxygen-containing functional groups by M-3. Overall, this study highlights the efficacy of bioliquefying coal using Aspergillus flavus (M-3) as a method for clean coal utilization while simultaneously bioleaching mercury.

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