Source and Enrichment of Toxic Elements in Coal Seams around Mafic Intrusions: Constraints from Pyrites in the Yuandian Coal Mine in Anhui, Eastern China

An, Yanfei; Liu, Lingling; Wang, Mina; Zheng, Sheng; Guo, YuanJie; Zhang, Shuai; Lai, Chun‐Kit

doi:10.3390/min8040164

Cited by 12 publications

(9 citation statements)

References 61 publications

(115 reference statements)

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“…Stepped release flotation uses differences in surface properties to separate minerals from coal; elements Sc, Co, Ni, Cu, Zn, Cd, Sb, Pb, As, Se, Sb, Bi, and Hg mainly occurred in pyrite, , while elements Be, F, V, Cr, Ba, W, Cs, and Tl dominantly occur within clay minerals, or other minerals, or organic matter . Thus, the distributions of Sc, Co, Ni, Cu, Zn, Sb, Pb, As, Se, Sb, Bi, and Hg in the products of stepped release flotation are different from those elements Be, F, V, Cr, Ba, W, Cs, and Tl.…”

Section: Discussionmentioning

confidence: 99%

Modes of occurrence and removal of toxic elements from high‐uranium coals of Rongyang Mine by stepped release flotation

Duan

Wang

Sang

et al. 2019

Energy Science & Engineering

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The Rongyang coals from Guizhou, southwestern China, are significantly enriched with uranium (U) and other toxic elements, such as vanadium (V), chromium (Cr), molybdenum (Mo), cobalt (Co), copper (Cu), and selenium (Se). Therefore, it is necessary to remove these toxic elements from high‐U coals before combustion. Previous studies have shown that U cannot be effectively removed by flotation and gravity separation. In this study, the stepped release flotation and acid leaching tests were conducted for coals of the Longtan Formation from the Rongyang Mine. The results from these analyses are as follows: (a) Stepped release analyses revealed that a multistage cleaning process can help to separate toxic elements from cleaned coals; (b) The removal of toxic elements by stepped release and acid leaching is closely related to their mode of occurrence. Vanadium, Cr, Mo, and U were difficult to be removed by stepped release flotation, which due to a significant proportion of them occur in organic matter and fine‐grained minerals; (c) Compared to flotation, most elements were better to be removed by stepped release flotation. In comparison with gravity separation, U had a higher removability by stepped release flotation, while the removal effect of thiophilic element by gravity separation was greater than by flotation; (d) After stepped release flotation, toxic elements Sc, V, Cu, Se, Mo, Hg, and U are still enriched in cleaned coals, suggesting that these elements cannot be fully removed through stepped release flotation.

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Section: Discussionmentioning

confidence: 99%

Modes of occurrence and removal of toxic elements from high‐uranium coals of Rongyang Mine by stepped release flotation

Duan

Wang

Sang

et al. 2019

Energy Science & Engineering

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“…Faults of various sizes and types were documented in the coalfield, but consist mainly of high-angle normal faults and rare reverse faults. The regional Huangji and Subei faults were interpreted to have formed in the same stage as the regional Carboniferous-Permian folding (which formed the Tongting syncline and Nanping anticline) (Figure 1C) (An et al, 2018).…”

Section: Geological Backgroundmentioning

confidence: 99%

Genesis of High-Mg Adakites in the Southeastern Margin of North China Craton: Geochemical and U-Pb Geochronological Perspectives

Zheng¹,

An²,

Lai³

et al. 2021

Front. Earth Sci.

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In the eastern North China Craton (NCC), Mesozoic tectonics was dominated by the Paleo-Pacific subduction rollback and the Tanlu crustal-scale fault movement. The regional transtension had generated extensive adakitic magmatism, some Cu-Au ore-forming but others not. To establish the geodynamic setting and any metallogenic link for the adakites from the southeastern NCC margin, we analyzed the ore-barren adakitic rocks from underground mines in the Huaibei-Linhuan coalfield (where surface igneous outcrops are scarce), and compared their ages and geochemistry with other mineralized and ore-barren adakites across Eastern China. Zircon U-Pb dating reveals two magmatic episodes in the Huaibei-Linhuan coalfield: 1) early-Early Cretaceous (ca. 130–129 Ma) (quartz-)diorite and granodiorite, and 2) late-Early Cretaceous (ca. 115.8 and 105.8 Ma) microgabbro and dolerite. Whole-rock geochemistry indicates that the (quartz-)diorite and granodiorite are high-Mg adakitic, featured by low K2O/Na2O (avg. 0.33), high Sr/La (avg. 44.3), and lack of correlation between SiO2 (fractionation index) and Sr/Y (avg. 56.55) and MREE/HREE (avg. 1.09), resembling typical adakites derived from oceanic-slab partial melting. Geochronological correlation with the regional tectonic events suggests that the slab-melting may have been caused by the Paleo-Pacific subduction rollback. Further extension and crustal thinning in the late-Early Cretaceous along the southern Tanlu fault may have formed the gabbro-dolerite in the coalfield. Geochemical comparison suggests that parental magma of the Huaibei-Linhuan adakites may have had similar water content [similar zircon 10,000*(Eu/Eu*)/Y and Eu/Eu* ratios] to typical porphyry Cu-Au ore-forming magmas, yet the former may have been considerably more reduced (lower zircon Ce/Nd and whole-rock V/Sc ratios). We considered that the assimilation of Carboniferous-Permian coal seams in the area may have further lowered the magma fO2 and thus its potential to form Cu-Au mineralization.

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“…One example is the element exchange in coal during magmatic intrusion [1][2][3]. This stage enriches some harmful elements [2], but the impact on rare earths is not pronounced [4,5]. Vanadium (V) and chromium (Cr) from magmatic hydrothermal fluids are thus enriched in coal seams [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

“…Feng et al [6] studied the elemental characteristics of coal in the Wolonghu coal mine, and proposed that the relative contents of Fe and Ti are lower than in the upper crust, and the enrichment coefficients of Ni and Cu are greater than 1. An et al [4,16] investigated the Raman spectral characteristics of pyrite in the rock-coal alteration zone of Wolonghu coal mine. However, systematic research on the composition and pyrolitical characteristics of organic matter in the magma-altered coals of Wolonghu coal mine is lacking.…”

Section: Introductionmentioning

confidence: 99%

Chemical Composition Variations of Altered and Unaffected Coals from the Huaibei Coalfield, China: Implications for Maturity

Feng

Wei

2021

Energies

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The composition characteristics of altered coals in the Huaibei Coalfield, China, was investigated through a comparative analysis between altered and unaffected coals from the Wolonghu, Taoyuan and Renlou coal mines. Results indicated that the altered coals in Wolonghu coal mine are mostly anthracite coals, with a maximum vitrinite reflectance of 1.6–3.9% (average of 2.9%). Coals from Wolonghu coal mine were mainly consisted of vitrinite (66.2–97.0%), followed by inertinite (2.0–4.0%) and exinite (0.4–6.9%). Differences in volatile matter content were observed between the altered coals in Wolonghu coal mine and unaffected coals from neighboring coal mines, implying that the chemical composition and maturity of coals were changed after magmatic alteration. In addition, differences in hydrogen element were noted among the coals from Wolonghu, Renlou and Taoyuan coal mines, and the phenomenon of “deficient in hydrogen element” was observed in Wolonghu coals. The aliphatic hydrocarbon structure parameters suggested that the aliphatic chain lengths of Wolonghu coals are shorter than those of coal samples from the Renlou and Taoyuan coal mines. In addition, maturity is positively correlated with hydrogen enrichment degree, but negatively related with aliphatic hydrocarbon structure. Coals from Renlou and Taoyuan coal mines showed great weight loss with various heating rates at temperatures of 0–1000 °C, whereas those from Wolonghu coal mine had less weight loss.

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Source and Enrichment of Toxic Elements in Coal Seams around Mafic Intrusions: Constraints from Pyrites in the Yuandian Coal Mine in Anhui, Eastern China

Cited by 12 publications

References 61 publications

Modes of occurrence and removal of toxic elements from high‐uranium coals of Rongyang Mine by stepped release flotation

Modes of occurrence and removal of toxic elements from high‐uranium coals of Rongyang Mine by stepped release flotation

Genesis of High-Mg Adakites in the Southeastern Margin of North China Craton: Geochemical and U-Pb Geochronological Perspectives

Chemical Composition Variations of Altered and Unaffected Coals from the Huaibei Coalfield, China: Implications for Maturity

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