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QINFU LIU, D. A. SPEARS, PENGFEI ZHANG, HONGLIANG XU; The origins of kaolinite-rich rocks associated with coal measures in China. Clay Minerals 2001;; 36 (3): 389–402. doi: Download citation file:
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concerning health effects associated with coal mining: 1. Exposure to coal mine dust causes various pulmonary diseases, including coal workers' pneumoconiosis (CWP) and chronic obstructive pulmonary disease (COPD). 2. Coal miners are also exposed to crystalline silica dust, which causes silicosis, COPD, and other diseases. 3.
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The main objective of this study is to review the environmental and hydrological issues associated with mining processes according to the stages in the lifecycle of a mine, the mineral type, and the different mining facilities, as well as the characteristics of the contaminants, by mainly focusing on the coal and aggregate minerals mining and ...
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The trace elements in coal associated with mineral matter, also known as the inorganic association, positively correlate with the ash yield. On the other hand, elements that show a negative correlation with ash yield are associated with the maceral components or, in other words, have an organic association. However, it is often seen that the ...
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The coal may ignite as a result of range and forest fires,lightningstrikes,arsonorcarelessness,orspontaneouscombustion. Four main types of coal fires occur: 1) fires in abandoned underground mines; 2) fires in highwalls and spoil piles in active surface mines; 3) fires on natural coal outcrops; and 4) low-level smoldering of coal beds
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Finkelman et al. (2018) applied this technique to show that REEs in bituminous coal were predominantly associated with the monazite and xenotime phosphate minerals (70% LREEs and 50% HREEs). The authors also reported that about 50 – 60% of REEs were primarily associated with clay minerals from low-rank coals.
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Base on chemical compositions, minerals found in coal can be classified into silicate, sulfide and selenide, phosphate, carbonate, sulfate, oxide and hydroxide, and others. …
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Coal is a complex geologic material composed mainly of organic matter and mineral matter, the latter including minerals, poorly crystalline mineraloids, and elements associated with non-mineral ...
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In coal, generally K-bearing minerals like orthoclase and clay are the sources of Rb. Hafnium, Beryllium, and Cesium. Hafnium is a strong lithophilic element and does not form …
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Introduction. Although the COVID-19 crisis completely reshaped the global coal market, China was still the largest coal producer and consumer in the world (IEA, 2020)pared with the statistics in 2009, China′s coal production and consumption increased by 24.0% and 15.7% in 2019, respectively (BP, 2020).Despite the adjustment of energy structure and industrial …
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Base on chemical compositions, minerals found in coal can be classified into silicate, sulfide and selenide, phosphate, carbonate, sulfate, oxide and hydroxide, and others. On the basis of their abundance, they can be classified into …
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There are several models developed to design coal waste waters, but all of them use the chemical reactions in terms of the total concentration of products formed from the initial mineral phases that oxidise [5].This chemical engineering approach is inadequate explaining the formation of secondary minerals or to diagnose the potential risk associated with chemical …
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Samples of tar and coal-fire minerals collected from the mouth of vents provided insight into the behavior and formation of the coal fires. ... Neoformed minerals associated with the vents are primarily ammonium sulfates and ammonium chlorides with minor zeolites. BTEX emissions, especially benzene, vary considerably, ranging from relatively ...
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The coal–mineral and mineral–mineral associations play an important role in the formation of fine particles and in subsequent condensation of trace elements in various phases. ... portion of minerals in coal is removed by a number of methods which is closely associated with association of TEs in coal. Those elements associated with minerals ...
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Mineral matter is generally considered to consist of all the inorganic minerals (discrete phases), as well as all elements (apart from C, H, O, N and S) that are in, or associated with, coal.
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In coal, rare earth elements primarily occur in detrital minerals, such as zircon, monazite, and xenotime. They may also be seen in aluminum-phosphate-sulfate-containing minerals, oxides, carbonates, or associated with the organic matter in coal (O'Keefe et al., 2011, Seredin and Dai, 2012, Seredin and Dai, 2012b, Kolker et al., 2017).
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The coexisting and associated minerals of coal measures, overlapping with coal seams, have great differences in occurrences and mining methods. The rock stratum movement and fluid migration caused by the mining of each mineral affect each other's normal mining operations. At present, traditional coal mines only exploit
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In coal mining areas, the ambient atmospheric and aqueous oxidation of pyrite minerals (FeS 2) associated with coal as well as the other accompanying strata is significant in understanding the extent of acid mine drainage (AMD), the cause of severe environmental pollution.Therefore, in this paper, the oxidation kinetics of the coal-associated pyrite (CAPy) …
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Quartz and the clay minerals are the most widespread and abundant mineral found in coal. Another common minerals are feldspars and carbonate in the form of siderite, calcite and dolomite...
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the mineral matter within coal and pre-concentration could be achieved by density separations. As such, representative samples of coarse refuses were collected from three coal processing plants.
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The possible recovery of critical elements from coal and its combustion byproducts is an exciting research area, representing a dramatic paradigm shift for coal. The minerals and associated non-mineral inorganic …
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Base on chemical compositions, minerals found in coal can be classified into silicate, sulfide and selenide, phosphate, carbonate, sulfate, oxide and hydroxide, and others....
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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 …
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NH 4-bearing illite occurs in mudrocks (siltstones, shales, and mudstones) from the anthracite and semi-anthracite coalfields of northeastern Pennsylvania, where the coexisting mineral assemblage and coal rank indicate very low grade metamorphism (T = 200-275°C). xrd, infrared absorption, and decomposition experiments all suggest the presence of an illite (polytype 2M 1) with …
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However, it is possible for other minerals to be present in coal seams or associated with the coal-bearing rocks. The most common minerals found in coal mines include: 1.Pyrite (FeS2): This is a ...
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corrosion or pollution associated with coal handling and use. Most of the problems associated with coal utilization arise in some way from the incorporated mineral matter (e.g. Gupta et al., 1999b), rather than directly from the maceral components. From the genetic point of view, the mineral matter in coal, like the organic matter, is a product ...
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Minerals in coal may form through a range of detrital, biogenic or authigenic processes. Knowledge of mineral matter may assist in understanding trace element …
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Minerals associated with coal deposits often include human carcinogens (e.g. As, silica). Individuals may be exposed to them in multiple routes (e.g. inhalation, ingestion). There are biologically plausible pathways whereby exposure may result in cancer genesis/promotion. And finally there are population-level studies showing that residing near ...
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The precombustion washing and washability of coal are increasingly gaining attention as a clean coal technology in China. In this study, the raw coal was collected from different coal seams in the south of Qinshui Coalfield, and flotation experiments were carried out in the laboratory after simple crushing. X-ray diffraction was used for qualitative analysis of the …
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16.2 Fossil Fuels Figure 16.12: Coal power plant in Helper, Utah. Fossil fuels are extractable sources of stored energy that were created by ancient ecosystems. The natural resources that typically fall under this category are coal, oil, petroleum, and natural gas.These resources were originally formed via photosynthesis by living organisms such as plants, phytoplankton, algae, …
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Common minor elements in coal are sodium, magnesium, aluminum, silicon, phosphorus, potassium, calcium, titanium, manganese, and iron. Most of the minor elements are associated with the minerals in coal, although phosphorus also is associated with the organic coal matrix. Minor elements are relatively common in coal.
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