Uranium bioleaching from low-grade carbonaceous-siliceous-argillaceous type uranium ore using an indigenous Acidithiobacillus ferrooxidans

Wang, Xuegang; Li, Peng; Liu, Yajie; Sun, Zhifu; Chai, Liyuan; Min, Xin; Guo, Yihang; Zheng, Zhoutao; Ke, Yanxiong; Liang, Yanjie

doi:10.1007/s10967-018-5957-3

Cited by 20 publications

(3 citation statements)

References 31 publications

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“…According to a study from Qi et al (2011), stone coal has been identi ed as an unconventional uranium resource in China. In speci c regions, uranium is enriched to the extent of deposits (such as carbon-silica mudstone type) (Wang et al 2018;Zhang 2000). Moreover, stone coal can be classi ed as a typical pyrite-type substance and high sulfur coal (Chou 2012), with a total sulfur content ranging from 2-4% (mainly pyrite-type sulfur) (Dai et al 2018).…”

Section: Introductionmentioning

confidence: 99%

Occurrence, mobility, and potential risk of uranium in an abandoned stone coal mine of Jiangxi Province, China

Wei,

Xu,

2024

Preprint

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Metal sulfide oxidation in abandoned exposed stone coal mines leads to the generation of Acid Mine Drainage (AMD), characterized with high uranium concentration, which is a major concern for local public health. This work employs an approach of geochemical analysis and modelling to determined the mode of occurrence of uranium. Additionally, potential environmental risks were evaluated. The results revealed that the primary source of uranium pollutants in the surrounding environmental media was attributed to the weathering of mine waste. Concentrations of harmful elements (e.g., U, Fe, sulfate) and acidity in water rapidly decreased to background levels with increasing distance from the mine. The geochemical distribution characteristics of sediments and water exhibit notable similarities. The species of uranium underwent a transformation as uranium in mine waste rocks migrated to environmental media. In acidic pit water, uranium primarily existed as uranyl sulfate, gradually transitioning downstream to complexes dominated by hydrophosphate and carbonate. This transition was accompanied by the coprecipitation of significant amounts of uranium with phosphate and iron hydroxides. Results from the geoaccumulation index (Igeo) and risk assessment codes (RAC) indicated that uranium in unweathered coal waste rocks and newly formed pit sediments posed a high environmental risk, with a bioavailable fraction reaching up to 26.44% and 48.0%, respectively. This research holds significant importance in devising remediation and management strategies for abandoned coal mines to mitigate the impact of uranium release and mobility on the surrounding ecological environment.

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Section: Introductionmentioning

confidence: 99%

Occurrence, mobility, and potential risk of uranium in an abandoned stone coal mine of Jiangxi Province, China

Wei,

Xu,

2024

Preprint

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“…Stone coal is a combustible, low-heat value, high-rank sedimentary rock mainly derived from early Paleozoic bacteria and algae after saponification and coalification in a marine influenced environment ( Dai et al, 2017 ). It is an important uranium resource (carbonaceous siliceous mudstone type) in southern China ( Wang et al, 2018 ), widely distributed in 10 provinces of southern China, with a total reserve of 61876.7 Mt. Essentially, it represents a kind of early Paleozoic (and in a few cases Permian) pyrite-rich combustible black shale ( Dai et al, 2017 ).…”

Section: Introductionmentioning

confidence: 99%

Microbial community structure in an uranium-rich acid mine drainage site: implication for the biogeochemical release of uranium

Wei,

Chen,

Zhu

et al. 2024

Front. Microbiol.

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The generation of acid mine drainage (AMD) characterized by high acidity and elevated levels of toxic metals primarily results from the oxidation and dissolution of sulfide minerals facilitated by microbial catalysis. Although there has been significant research on microbial diversity and community composition in AMD, as well as the relationship between microbes and heavy metals, there remains a gap in understanding the microbial community structure in uranium-enriched AMD sites. In this paper, water samples with varying levels of uranium pollution were collected from an abandoned stone coal mine in Jiangxi Province, China during summer and winter, respectively. Geochemical and high-throughput sequencing analyses were conducted to characterize spatiotemporal variations in bacterial diversity and community composition along pollution groups. The results indicated that uranium was predominantly concentrated in the AMD of new pits with strong acid production capacity, reaching a peak concentration of 9,370 μg/L. This was accompanied by elevated acidity and concentrations of iron and total phosphorus, which were identified as significant drivers shaping the composition of bacterial communities, rather than fluctuations in seasonal conditions. In an extremely polluted environment (pH < 3), bacterial diversity was lowest, with a predominant presence of acidophilic iron-oxidizing bacteria (such as Ferrovum), and a portion of acidophilic heterotrophic bacteria synergistically coexisting. As pollution levels decreased, the microbial community gradually evolved to cohabitation of various pH-neutral heterotrophic species, ultimately reverting back to background level. The pH was the dominant factor determining biogeochemical release of uranium in AMD. Acidophilic and uranium-tolerant bacteria, including Ferrovum, Leptospirillum, Acidiphilium, and Metallibacterium, were identified as playing key roles in this process through mechanisms such as enhancing acid production rate and facilitating organic matter biodegradation.

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“…Stone coal is a combustible, low-heat value, high-rank sedimentary rock mainly derived from early Paleozoic bacteria and algae after saponification and coalification in a marine influenced environment (Dai et al, 2017). It is an important uranium resource (carbonaceous siliceous mudstone type) in southern China (Wang et al, 2018), widely distributed in 10 provinces of southern China, with a total reserve of 61876.7 Mt. Essentially, it represents a kind of early Paleozoic (and in a few cases Permian) pyrite-rich combustible black shale (Dai et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

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Uranium bioleaching from low-grade carbonaceous-siliceous-argillaceous type uranium ore using an indigenous Acidithiobacillus ferrooxidans

Cited by 20 publications

References 31 publications

Occurrence, mobility, and potential risk of uranium in an abandoned stone coal mine of Jiangxi Province, China

Occurrence, mobility, and potential risk of uranium in an abandoned stone coal mine of Jiangxi Province, China

Microbial community structure in an uranium-rich acid mine drainage site: implication for the biogeochemical release of uranium

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