Mineralogical and Geochemical Compositions of the Lopingian Coals in the Zhongliangshan Coalfield, Southwestern China

Zou, Jianhua; Feng, Han; Tian, Li; Tian, Heming; Li, Yingjiao

doi:10.3390/min8030104

Cited by 10 publications

(8 citation statements)

References 84 publications

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“…In addition to confusing relation between the basaltic Emeishan and the basaltic Kangdian Upland as used by Qin et al, inferring the sediment source region for the coals as the basaltic Emeishan based on Ce and Eu anomalies is incorrect. Dai et al and other subsequent studies ,− showed that coals with input from the same Emeishan basalts have large positive Eu anomalies. On the basis of the Al 2 O 3 /TiO 2 ratios (12.33–25.44), the low concentrations of V, Sc, Co, Ni, Cu, and Zn, and the distinctively negative Eu anomalies for the K2 coal, Dai et al further concluded that inorganic materials in the K2 coal were dominantly derived from the felsic-intermediate terrigenous rocks at the top of the Emeishan basalt sequence rather than the mafic Emeishan basalts themselves.…”

Section: Geochemistrymentioning

confidence: 82%

Comments on Geochemical Characteristics of Rare-Metal, Rare-Scattered, and Rare-Earth Elements and Minerals in the Late Permian Coals from the Moxinpo Mine, Chongqing, China

et al. 2018

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The paper Geochemical Characteristics of Rare-Metal, Rare-Scattered, and Rare-Earth Elements and Minerals in the Late Permian Coals from the Moxinpo Mine, Chongqing, China by Qin et al. in Energy & Fuels provides potentially useful data on the proximate analysis, geochemical, and mineralogical properties of the Late Permian (No. K2) coal from the Moxinpo Mine, Chongqing, China. However, after a careful examination of the whole paper, we regrettably found that the paper by Qin et al. is affected by issues of coal rank determination, mineralogical identification, geochemical composition, and geological interpretation, some of which at least may need careful reconsideration.The paper Geochemical Characteristics of Rare-Metal, Rare-Scattered, and Rare-Earth Elements and Minerals in the Late Permian Coals from the Moxinpo Mine, Chongqing, China by Qin et al. 1 provides potentially useful data on the proximate analysis, geochemical, and mineralogical properties of the Late Permian (No. K2) coal from the Moxinpo Mine, Chongqing, China. We read it with great interest because (1) we have recently investigated the same coal in the same area, 2 (2) this coalfield is one of the important coal-producing areas in southwestern China, and (3) the coals in the this coalfield and surrounding coal deposits have highly elevated concentrations of critical elements, such as U, Re, V, Cr, and Se, and rare earth elements and Y (REY or REE if Y is not included), making them potential raw material sources for these important elements. 2−4 Regrettably, the paper by Qin et al. 1 is affected by issues of coal rank determination, mineralogical identification, geochemical composition, and geological interpretation, some of which at least may need careful reconsideration.

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Section: Geochemistrymentioning

confidence: 82%

Comments on Geochemical Characteristics of Rare-Metal, Rare-Scattered, and Rare-Earth Elements and Minerals in the Late Permian Coals from the Moxinpo Mine, Chongqing, China

et al. 2018

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“… 8 , 11 , 88 − 92 The late Permian coals in southwestern China have been reported repeatedly for enrichment of REY. 9 , 23 , 27 , 42 , 68 , 93 Seredin and Dai proposed the cut-off grade of oxides of REY in coal ash (1000 μg/g) and an evaluation index, outlook coefficient (C outl ). 11 REY with the C outl > 2.4, 0.7 ≤ C outl < 1.9, and C outl < 0.7 represent highly promising, promising, and unpromising, respectively.…”

Section: Discussionmentioning

confidence: 99%

Mineralogical and Geochemical Compositions of Ammonian Illite-Enriched High-Rank Coals of the Xingying Mine, Northeastern Chongqing, China

et al. 2022

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Ammonian illite (NH 4 -illite)-rich late Permian coals of high rank were discovered in southwestern China. This research reports new mineralogical and geochemical data of 11 bench samples from the adjacent Xingying mine, northeastern Chongqing Coalfield, southwestern China, with an emphasis on the modes of occurrence and origin of NH 4 -illite. The Xingying coals, with low ash yields and medium sulfur, have a high rank (semianthrite, R o,ran = 3.67%), owing to the plutonic metamorphism. Minerals in the coal consist of NH 4 -illite and pyrite and, to a lesser extent, jarosite, albite, and anatase, with traces of chamosite, quartz, bassanite, apatite, fluorapatite, florencite, and rhabdophane. Compared with world hard coals, vanadium is significantly enriched with a concentration coefficient (CC) higher than 10; Mo and Pb are enriched (5 < CC < 10); F, Co, Ni, Cu, Ge, Se, Y, Zr, Nb, Ag, Cd, In, Sn, Cs, Sm, Eu, Tb, Dy, Er, Yb, Hf, Bi, and U are slightly enriched (2 < CC < 5) in the Xingying coals. Fluorine in host rocks, including roof, floor, and parting, is significantly enriched. Fluorine concentration in the coal may be increased greatly if the coal is mixed with host rocks during mining activity. Hence, the Xingying coals should be subjected to beneficiation before utilization for the environment and human health. The Al 2 O 3 /TiO 2 and Eu anomalies demonstrated that the terrigenous materials come from the mafic basalts of the Kangdian Upland. NH 4 -illite is formed by interaction of pre-existing kaolinite or K-illite with NH 4 + released from organic matter under high temperatures during the process of hydrothermal alteration. The authigenic chamosite, albite, quartz, anatase, apatite, fluorapatite, and rhabdophane are also deposited from the hydrothermal solutions. In addition, the Xingying coals are subjected to marine influences. Based on the preliminary evaluation, the Xingying coals cannot be a potential source for critical elements such as rare earth elements and yttrium. This indicates that not all the late Permian coals in southwestern China have economic significance for critical elements.

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“…Lithium is a critical metal in China, United States, the EU, and many other countries. Many attempts have been made to recover Li from coal ash. ,− Though there is a relatively high Li concentration in Chinese coals, it is still much lower than the Chinese industrial indicator for recovery of associated Li 2 O (0.2%) . Only coals from a few coalfields, such as Jungar and Pingshuo coals, have reached the industrial indicator.…”

Section: Discussionmentioning

confidence: 99%

“…Lithium is one of the most highly investigated critical metals in Chinese coals. The Late Carboniferous–Early Permian coals in the north of North China Craton are the most well-known Li-rich coals. − The concentration of Li in No. 6 coal of the Heidaigou Mine, Jungar Coalfield, Inner Mongolia is 657 μg/g, and the concentration in No.…”

Section: Introductionmentioning

confidence: 99%

Geochemical and Mineralogical Characteristics of the Li–Sr-Enriched Coal in the Wenjiaba Mine, Guizhou, SW China

Ning

Qiao

et al. 2021

ACS Omega

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This paper reports the mineralogical and geochemical compositions of C6 coal in the Late Permian Longtan Formation of the Wenjiaba Mine, Northern Guizhou in southwest (SW) China. The geochemical and mineralogical studies are the basis for the potential recovery of critical metals. The Longtan Formation, which is one of the major coal-bearing strata in SW China, contains dozens of coal seams. C6 coal is the main mineable coal seam in the Wenjiaba Mine and the whole coalfield. Proximate and ultimate analyses, inductively coupled plasma mass spectrometry (ICP-MS) and X-ray fluorescence (XRF) spectrometry on trace and major element concentrations, and X-ray diffraction and SEM-EDS analyses were carried out. Results suggest that this anthracite coal is characterized by low ash yield and medium sulfur content. The minerals are mainly composed of clay minerals (kaolinite, chlorite, illite, and mixed-layer illite/smectite), pyrite, and carbonates. Lithium is significantly enriched in C6 coal, with an average of 124 μg/g, and it has a higher concentration in the lower portion of the coal seam than that in the upper one. Strontium is significantly enriched in samples WJB-05 and WJB-06, with concentrations of 3030 and 4580 μg/g, respectively, but it is normal or just slightly enriched in other benches of C6 coal. Additionally, Cu, Nb, and Ta are slightly enriched in the coal. Lithium, dominantly hosted by kaolinite in C6 coals, has a recovery potential. Celestine is one of the major Sr-bearing minerals in C6 coal.

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Mineralogical and Geochemical Compositions of the Lopingian Coals in the Zhongliangshan Coalfield, Southwestern China

Cited by 10 publications

References 84 publications

Comments on Geochemical Characteristics of Rare-Metal, Rare-Scattered, and Rare-Earth Elements and Minerals in the Late Permian Coals from the Moxinpo Mine, Chongqing, China

Comments on Geochemical Characteristics of Rare-Metal, Rare-Scattered, and Rare-Earth Elements and Minerals in the Late Permian Coals from the Moxinpo Mine, Chongqing, China

Mineralogical and Geochemical Compositions of Ammonian Illite-Enriched High-Rank Coals of the Xingying Mine, Northeastern Chongqing, China

Geochemical and Mineralogical Characteristics of the Li–Sr-Enriched Coal in the Wenjiaba Mine, Guizhou, SW China

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