Origins and occurrences of Ti-nanominerals in a superhigh-organic-sulfur coal

Zhao, Yueyuan; Liang, Huzhen; Zeng, Fangui; Tang, Yuegang; Liang, Litong; Takahashi, Fumio

doi:10.1016/j.fuel.2019.116302

Cited by 4 publications

(3 citation statements)

References 55 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The Fast Fourier Transform (FFT) patterns (lattice distances and angles) of the TEM images were obtained through a digital micrograph (DM) software. Nanominerals always have certain crystal defects (such as additional disordering, shearing, or impurities), which means that there will be slight differences between the tested nanominerals and standard minerals in the Inorganic Compound Powder Diffraction File (PDF) database of Jade 6.5 software …”

Section: Sampling and Methodsmentioning

confidence: 99%

“…Nanominerals always have certain crystal defects (such as additional disordering, shearing, or impurities), which means that there will be slight differences between the tested nanominerals and standard minerals in the Inorganic Compound Powder Diffraction File (PDF) database of Jade 6.5 software. 37 2.2.3. Sequential Chemical Extraction.…”

Section: Mineralogical and Nanomineralogical Analysesmentioning

confidence: 99%

See 1 more Smart Citation

Anomalous Enrichment of As and Hg in Underground Coal Dust: A Case from Xishan Coalfield, Shanxi Province, North China

wang

Zeng

et al. 2023

ACS Omega

Self Cite

View full text Add to dashboard Cite

Coal dust is an important source of coal workers’ pneumoconiosis, which is harmful to the health of underground workers. The coal dust samples were directly collected using a coal dust sampler from four major production positions in the underground coal mine. The particle size distribution, mineralogy, and occurrence of As and Hg in the coal dust samples were investigated. The results indicated that the contents of As and Hg were depleted or normal in the parent coal samples compared with the average values of C–P coal in North China and Chinese coal, but they were anomalously enriched in coal dusts. The concentrations of As and Hg in the coal dust samples studied are greater than the values of the elements in the parent coal. The As content in the coal dust samples studied is about one to three orders of magnitude above the parent coal value and the Hg content in the studied coal is 1.28 to 20.28 times higher than the parent coal value. The modes of occurrences of As and Hg were studied by sequential chemical extraction in combination with field emission scanning electron microscopy-energy dispersive spectroscopy (FESEM-EDS) and high-resolution transmission electron microscopy-EDS (HRTEM-EDS). The occurrence of As is dominated mainly by pyrite and secondarily by carbonate and silicate in the coal dust samples. Pyritic Hg and organic Hg may be the dominant forms in mining face and heading face samples, and carbonate and pyritic Hg are the main forms in rocks roadway and return airway samples. It is considered that the mechanochemical effect resulted in the formation of surface active sites and modification of the morphology. Harmful trace elements, such as As, Cd, Hg, Se, Pb, Co, Sb, and Tl, and minor grains associated with nanominerals that bear much hazardous elements, could easily be originally fractionated or adsorbed by airborne particulates. This research aims to provide a theoretical basis for the prevention of occupational disease and underground environmental evaluation.

show abstract

Section: Sampling and Methodsmentioning

confidence: 99%

Section: Mineralogical and Nanomineralogical Analysesmentioning

confidence: 99%

Anomalous Enrichment of As and Hg in Underground Coal Dust: A Case from Xishan Coalfield, Shanxi Province, North China

wang

Zeng

et al. 2023

ACS Omega

Self Cite

View full text Add to dashboard Cite

show abstract

“…Coals formed in marine carbonate platforms are primarily distributed in South China, including Heshan [1][2][3][4], Fuisu [5], Xian'an [6], Yishan [7], Guiding [8], Yanshan (Yunnan Province) [9], and Chenxi (Hunan Province) coalfields [10], of which the first four are located within Guangxi Province, South China. These coals mostly contain highly enhanced concentrations of sulfur (especially organic sulfur) and, thus are classified as super-highorganic-sulfur (SHOS) coals [11,12].…”

Section: Introductionmentioning

confidence: 99%

Geological Controls on Geochemical Anomaly of the Carbonaceous Mudstones in Xian’an Coalfield, Guangxi Province, China

Zhang

Liao³

et al. 2022

Energies

View full text Add to dashboard Cite

The anomalous enrichment of the rare earth elements and yttrium (REY), U, Mo, As, Se, and V in the coal-bearing intervals intercalated within the carbonate successions in South China has attracted much attention due to the highly promising recovery potential for these elements. This study investigates the mineralogical and geochemical characteristics of the late Permian coal-bearing intervals (layers A–F) intercalated in marine carbonate strata in the Xian’an Coalfield in Guangxi Province to elucidate the mode of occurrence and enrichment process of highly elevated elements. There are two mineralogical assemblages, including quartz-albite-kaolinite-carbonates assemblage in layers D–F and quartz-illite-kaolinite-carbonates assemblage in layers A–C. Compared to the upper continental crust composition (UCC), the REY, U, Mo, As, Se, and V are predominantly enriched in layers A and B, of which layer A displays the REY–V–Se–As assemblage while layer B shows the Mo–U–V assemblage. The elevated REY contents in layer B are primarily hosted by clay minerals, zircon, and monazite; Mo, U, and V show organic association; and As and Se primarily display Fe-sulfide association. Three geological factors are most likely responsible for geochemical anomaly: (1) the more intensive seawater invasion gives rise to higher sulfur, Co, Ni, As, and Se contents, as well as higher Sr/Ba ratio in layers A–C than in layers D–F; (2) both the input of alkaline pyroclastic materials and the solution/rock interaction jointly govern the anomalous enrichment of REY; and (3) the influx of syngenetic or early diagenetic hydrothermal fluids is the predominant source of U, Mo, V, Se, and As.

show abstract

Aluminum-bearing nano-sized minerals in vitrain band and its implications for modes of occurrence of Al in Carboniferous-Permian coals from the Hedong Coalfield, northern China

Wang

Bian

Zeng

et al. 2021

International Journal of Coal Geology

View full text Add to dashboard Cite

Origins and occurrences of Ti-nanominerals in a superhigh-organic-sulfur coal

Cited by 4 publications

References 55 publications

Anomalous Enrichment of As and Hg in Underground Coal Dust: A Case from Xishan Coalfield, Shanxi Province, North China

Anomalous Enrichment of As and Hg in Underground Coal Dust: A Case from Xishan Coalfield, Shanxi Province, North China

Geological Controls on Geochemical Anomaly of the Carbonaceous Mudstones in Xian’an Coalfield, Guangxi Province, China

Aluminum-bearing nano-sized minerals in vitrain band and its implications for modes of occurrence of Al in Carboniferous-Permian coals from the Hedong Coalfield, northern China

Contact Info

Product

Resources

About