Mineralogical and geochemical characteristics of the Permian coal from the Qinshui Basin, northern China, with emphasis on lithium enrichment

Wang, Xiaomei; Pan, Zhejun; Pan, Wenhao; Yin, Xue‐Bo; Chai, Pancun; Pan, Sidong; Yang, Qing

doi:10.1016/j.coal.2019.103254

Cited by 56 publications

(17 citation statements)

References 81 publications

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“…The rest of trace elements had a proximate order of magnitude with the Chinese coal (Figure 2a). Previous studies corroborated that coal seams of Pennsylvanian and Early Permian in age from Shanxi Province and Inner Mongolia generally enriched in Li, Ga, Sr, Ba, Zr, Hf, and Th within different levels [3,[19][20][21]62,65,78]. Concentration coefficient (CC) is an effective index to elucidate enrichment signature of elements in coal.…”

Section: Trace Elementsmentioning

confidence: 67%

“…In the past decades, coal production and consumption around the world have surged more than 150%, and it was estimated that coal will account for more than 24% in the proportion of primary energy by 2035 [2]. Coal remains as a valuable resource that is still used for both industrial and domestic purposes in many countries globally [3][4][5]. Besides being fossil fuel for energy supply, coal with some rare and critical trace elements of higher concentration is also considered as economic even strategic resource.…”

Section: Introductionmentioning

confidence: 99%

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Enrichment Mechanisms of Gallium and Indium in No. 9 Coals in Anjialing Mine, Ningwu Coalfield, North China, with a Preliminary Discussion on Their Potential Health Risks

Zhang

Hao

Tian³

et al. 2021

Minerals

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To provide a comprehensive insight into the enrichment mechanism of gallium and indium in No. 9 coals, eighteen samples were collected from Anjialing mine, Ningwu Coalfield, Shanxi Province for coal petrological, mineralogical and geochemical analyses. The results suggested that Ga and In enrichment mainly hosted in the top horizons, with average concentration coefficients of 8.99 and 2.73 respectively, compared with the rest of horizons (2.46 for Ga and 1.69 for In). Source apportionment indicated that Ga and In were mainly derived from bauxite of Benxi Formation in Yinshan Oldland, while In could originate from felsic magmatic rocks in Yinshan Oldland as well. In addition, weak oxidation condition, medium to intensive weathering, transgression and input of terrestrial higher plants had positive effects on Ga and In enrichment. With the rapid expansion of emerging electronics manufacturing, Ga and In, of which potential risks on human health were neglected previously, were recently considered as hazardous elements. Therefore, this paper also discussed the potential pathways that these elements threatened human health. We suggested that potential risks on environment and human health caused by Ga and In enrichment in coals and coal-related products should be taken into account besides their economic value.

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Section: Trace Elementsmentioning

confidence: 67%

Section: Introductionmentioning

confidence: 99%

Enrichment Mechanisms of Gallium and Indium in No. 9 Coals in Anjialing Mine, Ningwu Coalfield, North China, with a Preliminary Discussion on Their Potential Health Risks

Zhang

Hao

Tian³

et al. 2021

Minerals

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show abstract

“…By using SCE methods, Zhao (1997) determined Cr occurrences in bituminous coal and anthracite in China, and observed that most Cr occurred in clay minerals (94.9-100%), which might be due to the isomorphic substitution of Cr(III) and Al(III). Moreover, Wang et al (2019aWang et al ( , 2019b concluded that the presence of humic acid could increase the adsorption of Cr on clay minerals.…”

Section: Association With Clay Mineralsmentioning

confidence: 99%

Chromium in Chinese coals: geochemistry and environmental impacts associated with coal-fired power plants

Tang

Zhang

Zhao

et al. 2022

Environ Geochem Health

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Chromium (Cr), one of the prime hazardous trace elements in coals, may engender adverse effects on eco-environment and threaten human health during utilization of coal. Based on the samples obtained in our laboratory and published literature, the abundance and modes of occurrence of Cr in Chinese coals, and the environmental impacts associated with coal-fired power plants (CFPPs) were elucidated in this study. With a total of 1397 sets of data, the mean concentration of Cr in Chinese coals was calculated as 21.33 μg/g by the “reserve-concentration” weighted calculation method. Spatially, the average Cr contents increased gradually from North China to South China. Temporally, coals from T 3 , E–N and P 2 were relatively enriched in Cr compared to the other geological time. The Cr concentration in coal varied with different coal ranks. The geological factors accounted for Cr enrichment in coals could be divided into the primary, secondary and epigenetic processes. Higher percentages of organically Cr occurred in low-rank coals, while inorganically associated Cr was mainly found in clay minerals. After coal combustion, most of Cr was enriched in solid wastes (e.g., fly ash and bottom ash). The leaching of Cr from solid wastes in the rainy season (especially acid rain) needs to be a concern for CFPPs. It was estimated that the atmospheric emission of Cr from CFPPs increased annually from 2015 to 2019 and reached approximately 159 tons in 2019.

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“…Here, x j can be assigned with Al 2 O 3 because aluminum is a stable element during peat accumulation, diagenetic and epigenetic processes relative to other major elements (such as Na, Mg, Si, K, Ca) [21][22][23][24][25][26][27][28][29][30], although Al is somewhat mobile in some very specific geological conditions [11,25].…”

Section: Improved Additive Log-ratio Transformationmentioning

confidence: 99%

Towards Consistent Interpretations of Coal Geochemistry Data on Whole-Coal versus Ash Bases through Machine Learning

Peng

et al. 2020

Minerals

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Coal geochemistry compositional data on whole-coal basis can be converted back to ash basis based on samples' loss on ignition. However, the correlation between the concentrations of elements reported on whole-coal versus ash bases in many cases is inconsistent. Traditional statistical methods (e.g., correlation analysis) for compositional data on both bases may sometimes result in misleading results. To address this issue, we hereby propose an improved additive log-ratio data transformation method for analyzing the correlation between element concentrations reported on whole-coal versus ash bases. To verify the validity of the method proposed in this study, a data set which contains comprehensive analyses of 106 Late Paleozoic coal samples from the Datanhao mine and Adaohai Mine, Inner Mongolia, China, is used for the validity testing. A prediction model was built for performance evaluation of two methods based on the hierarchical clustering algorithm. The results show that the improved additive log-ratio is more effective in prediction for occurrence modes of elements in coal than the previously reported stability method, and therefore can be adopted for consistent interpretations of coal geochemistry compositional data on whole-coal vs. ash bases.

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Mineralogical and geochemical characteristics of the Permian coal from the Qinshui Basin, northern China, with emphasis on lithium enrichment

Cited by 56 publications

References 81 publications

Enrichment Mechanisms of Gallium and Indium in No. 9 Coals in Anjialing Mine, Ningwu Coalfield, North China, with a Preliminary Discussion on Their Potential Health Risks

Enrichment Mechanisms of Gallium and Indium in No. 9 Coals in Anjialing Mine, Ningwu Coalfield, North China, with a Preliminary Discussion on Their Potential Health Risks

Chromium in Chinese coals: geochemistry and environmental impacts associated with coal-fired power plants

Towards Consistent Interpretations of Coal Geochemistry Data on Whole-Coal versus Ash Bases through Machine Learning

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