Mineral composition and geochemical characteristics of the Li-Ga-rich coals in the Buertaohai-Tianjiashipan mining district, Jungar Coalfield, Inner Mongolia

Li, Jing; Zhuang, Xinguo; Yuan, Wei; Liu, Bo; Querol, Xavier; Font, Oriol; Moreno, Natàlia; Li, Jianfu; Gang, Temuer; Liang, Guankao

doi:10.1016/j.coal.2016.09.018

Cited by 58 publications

(34 citation statements)

References 40 publications

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“…The strong positively correlation between P and CaO (r = 0.74) also indicates that P is mainly incorporated into apatite. In addition, P and Sr (r = 0.96), P and Ba (r = 0.94) have significant positive correlations, which is in accordance with the Heidaigou [18], Haerwusu [19], and Buertanhai-Tianjiashipan [21] coals. In these coalfields, the major carrier of P is goyazite (Haerwusu and Heidaigou coals) and svanbergite (Buertanhai-Tianjiashipan coals) [18][19][20][21].…”

Section: Phosphorus Sr and Basupporting

confidence: 69%

“…Boehmite is detected by SEM-EDS in the Permian coals and mainly occurs as finely disseminated grains within the kaolinite matrix ( Figure 9B), possibly indicating a detrital origin. It has also been found in other Permian coals in the Jungar Coalfield and Weibei Coalfield [3,[18][19][20][21]52].…”

Section: Oxide and Hydroxide Mineralsmentioning

confidence: 63%

“…Furthermore, Nb and Y were detected in apatite by means of SEM-EDS ( Figure 8C). This mode of occurrence of REYs is different from P-bearing minerals (goyazite and svanbergite) in the Junger Coalfield coals [19,21].…”

Section: Phosphorus Sr and Bamentioning

confidence: 66%

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Geological Controls on Mineralogy and Geochemistry of the Permian and Jurassic Coals in the Shanbei Coalfield, Shaanxi Province, North China

Shangguan

Zhuang

et al. 2020

Minerals

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Coal as the source of critical elements has attracted much attention and the enrichment mechanisms are of significant importance. This paper has an opportunity to investigate the mineralogical and geochemical characteristics of the Permian and Jurassic bituminous coals and associated non-coals from two underground coal mines in the Shanbei Coalfield (Northeast Ordos basin), Shaanxi Province, North China, based on the analysis of X-ray diffraction (XRD), inductively coupled plasma atomic-emission spectrometry (ICP-AES/MS), and scanning electron microscopy-energy-dispersive X-ray spectroscopy (SEM-EDS). The Jurassic and Permian coals have similar chemical features excluding ash yield, which is significantly higher in the Permian coals. Major mineral matters in the Jurassic coals are quartz, kaolinite, and calcite. By contrast, mineral assemblages of the Permian coals are dominated by kaolinite; and apatite occurring in the middle section’s partings. The Jurassic coals are only enriched in B, whereas the Permian coals are enriched in some trace elements (e.g., Nb, Ta, Th, and REY). Boron has a mixed inorganic and organic association which may be absorbed by organic matter from fluid (or groundwater) or inherited from coal-forming plants. Additionally, climatic variation also plays an important role. As for the Permian coals, kaolinite and apatite as the major carriers of elevated elements; the former were derived from the sedimentary source region (the Yinshan Oldland and the Benxi formation) and later precipitated from Ca-, and P-rich solutions. We deduced that those elevated elements may be controlled by the source rock and diagenetic fluid input. The findings of this work offered new data to figure out the mechanism of trace element enrichment of coal in the Ordos basin.

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Section: Phosphorus Sr and Basupporting

confidence: 69%

Section: Oxide and Hydroxide Mineralsmentioning

confidence: 63%

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Geological Controls on Mineralogy and Geochemistry of the Permian and Jurassic Coals in the Shanbei Coalfield, Shaanxi Province, North China

Shangguan

Zhuang

et al. 2020

Minerals

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“…The detailed experiment methods and principles were given in prior publication [20]. Table 2 lists the mineral compositions before acidification, indicating relatively high contents of clay minerals (illite, montmorillonite, and kaolinite), which were equal to 93% for Malan coal and 85% for Tunlan coal.…”

Section: Mineral Composition and Ion Contentmentioning

confidence: 99%

Experimental Study of CO2-Water-Mineral Interactions and Their Influence on the Permeability of Coking Coal and Implications for CO2-ECBM

Guo

Wang

et al. 2018

Minerals

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Abstract:Coal permeability is one of the most critical parameters affecting gas flow behavior during coalbed methane (CBM) production. However, little research has been conducted on how permeability evolves after CO 2 injection in coking coal. Hence, examining possible chemical interactions between coal minerals, water, and injected CO 2 can be very helpful to better characterize coking coal. In this study, coking coal specimens obtained from the Malan and Tunlan mines located in the Gujiao block of the Qinshui basin were treated with water and CO 2 to achieve a better understanding of their dissolution kinetics, pore structure, and permeability. It was found that the relative carbonate mineral content decreases with time, while the relative clay mineral content increases after the reaction with CO 2 and water. Scanning electron microscopy (SEM) confirmed these mineral alteration phenomena. Carbonate minerals (calcite, dolomite) dissolve faster than clay minerals (montmorillonite, illite and kaolinite). In particular, the dissolution rates of Ca 2+ in carbonate minerals increases with decreasing temperature (25-45 • C) and pH (4.3-6.3), and the dissolution rate of Ca 2+ ions in the calcite reaction solution is higher than that in the dolomite solution. In addition, the results of low-pressure nitrogen adsorption analysis showed that CO 2 injection can enlarge smaller size pores into larger size pores and change the overall pore size distribution. Therefore, CO 2 injection can increase the porosity of coal beds and ultimately their permeability, which in turn facilitates CBM production.

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“…Critical elements, including rare earth elements, in coal have attracted significant attention in recent years due to their increasing prevalence in industrial technologies and their contributions to the economy [1]. Previous studies have found a number of coals being considered as an economic source of scores of critical elements, including Ge, Ga, U, V, Se, rare earth elements and Y (REY or REE if Y is not included), Sc, Y, Nb, Au, Ag, platinum group elements (PGEs), and Re, as well as some base metals, such as Al and Mg [1][2][3][4][5][6]. Further, there are cases where the industrial utilization of critical elements from coal has been successful, such as for Ga, Ge, Se, U, and V. Other critical elements, including Nb, Au, Ag, Re, Al, Mg, and REY, are considered to have prospects for the recovery from coal deposits [1].…”

Section: Introductionmentioning

confidence: 99%

New Data and Evidence on the Mineralogy and Geochemistry of Wulantuga High-Ge Coal Deposit of Shengli Coalfield, Inner Mongolia, China

et al. 2019

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The mode of occurrence and origin of highly-enriched trace elements, especially Ge, in Wulantuga high-Ge coal deposit have been widely reported. In this study, coal samples and several coalified trunks embedded within the roof strata are collected, which provides a good opportunity to further confirm if Ge is mainly associated with organic matter. Minerals in coal samples are mainly quartz, kaolinite, montmorillonite, pyrite, and gypsum, along with trace albite, barite, chlorite, and Fe-oxide, while those in coalified trunk samples include melanterite, pyrite, and gypsum, with traces of chlorite and magnesiocopiapite. Germanium, As, W, Sb, Hg, Be, and Cs are enriched in coal samples, and these elements are also enriched in the coalified trunks and roof glutenite. The elevated contents of Ge, As, W, Sb, and Hg were almost exclusively derived from the influx of hydrothermal fluids as evidenced by the presence of pyrite veins and chamosite as well as enhanced elemental associations of Ge-W and As-Sb-Hg in the studied lignite samples. The coalified trunks in the study area should be taken into consideration due to the high contents of hazardous elements that cause potential environmental impacts during mining waste disposal and land reclamation.

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Mineral composition and geochemical characteristics of the Li-Ga-rich coals in the Buertaohai-Tianjiashipan mining district, Jungar Coalfield, Inner Mongolia

Cited by 58 publications

References 40 publications

Geological Controls on Mineralogy and Geochemistry of the Permian and Jurassic Coals in the Shanbei Coalfield, Shaanxi Province, North China

Geological Controls on Mineralogy and Geochemistry of the Permian and Jurassic Coals in the Shanbei Coalfield, Shaanxi Province, North China

Experimental Study of CO2-Water-Mineral Interactions and Their Influence on the Permeability of Coking Coal and Implications for CO2-ECBM

New Data and Evidence on the Mineralogy and Geochemistry of Wulantuga High-Ge Coal Deposit of Shengli Coalfield, Inner Mongolia, China

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