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Chemical analyses and physical properties of 12 coal samples from the Pocahontas field, Tazewell County, ia, and McDowell County, West ia. (Geological Survey bulletin ; 1528) Bibliography: p. Supt. of Docs. no.: I 19.3:1528 1. Coal-ia-Tazewell County-Analysis. 2. Coal-West ia-McDowell County Analysis. I.
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coal gangue. As a pioneer species, puff balls absorbed the hazardous trace elements in coal gangue matrix to reduce its eco-toxicity, on the other hand, it raised the pH value of coal gangue, improving the vegetation growing condi-tions for coal gangue matrix to a certain extent and laying the foundation for ecological restoration of coal gangue
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1.2.2017· The change characteristics of physico-chemical properties of the coal gangue in profile are also obvious. Through the comparative analysis of the upper and lower layers, it is found that the electric conductivity and pH value in the upper layer are generally slightly higher than that of the lower layer, while the cation exchange capacity in the upper layer is slightly lower than that of the
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23.11.2017· The microstructure and mineral composition of the gangue play a decisive role in the precipitation of heavy metal elements. In this study, the microstructure, mineral composition, and precipitation of heavy metal elements of coal gangue with different weathering degrees were analyzed through electron microscopy, X-ray diffraction, and static immersion leaching experiments.
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1.5.2021· Coal gangue has become one of the industrial wastes with the largest annual discharge and accumulated stock in China. The disorderly accumulation of coal gangue not only occupies a large amount of land resources and causes natural disasters, but also pollutes the surrounding ecological environment, which in turn affects human health and normal production and life.
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The compression mechanical properties of coal gangues subjected to acidic immersion were examined using a cylinder and a YAS-500 electrohydraulic servotesting system in order to investigate the effects of pH and particle size on its compaction stress-strain and stress-compaction relationships. The evolutionary trends of the leaching solution’s pH at various immersion times during the
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1.7.2013· In order to effectively utilize coal gangue and its calorific value (4180–12,540 kJ/kg), coal gangue was converted into energy-saved cement by activating at 800 °C with an integrated thermal and chemical activation method.Microanalysis with XRD and NMR indicates that improved pozzolanic reactivity for coal gangue contributes to the mineral phase change with amorphous status during
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the self-igniting coal gangue in Gaode Mine, Fuxin city of Liaoning Province by physical and chemical method.first,orthogonal test was applied to study the influence of the fineness of coal gangue on strength of the bonding material;then on the basic of it,use this method again to clarify the effects of self-igniting coal gangue's addition on th strength of bonding material.The results of this
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20.12.2017· Coal gangue is one of the largest industrial residues. It has high ash content, low carbonaceous content, and heating value. Meanwhile, it has some trace elements. Large quantities of coal gangue cause serious environmental problems by polluting the air, water, and soil as well as occupying a tremendous amount of land. Now, coal gangue utilization is a matter of great concern
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22.8.2019· In China, coal-fired thermal power accounts for more than 70% of China's electricity. 1 Coal gangue is a type of by-product generated from the process of coal excavation and washing, accounting for 10–15% of China's total coal production. 2,3 The quantity of China's coal gangue has reached 4.5 billion tons in 2011, and is generated at a rate of more than 600 million tons per year. 4,5
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30.11.2020· Coal gangue ceramsite is processed from coal gangue produced in a coal mine in the Shenmu area (Shaanxi province, China), with a particle size of 4–8 mm, the apparent density of 1650 kg m −3, the water absorption rate of 6.68%, and crushing index of 20.8%.
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In the process of excavation and utilization of the coal gangue hill, gangue at different weathering degree was exposed to the environment, which can be harmful to the surroundings. In order to find the law of heavy metal release and to evaluate the potential ecological risk, five kinds of coal gang
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Coal and gangue recognition under four operating conditions by using image analysis and Relief-SVM Dongyang Dou Key Laboratory of Coal Processing and Efficient Utilization of Ministry of Education, China University of Mining and Technology, Xuzhou P R China ;School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou P R China Correspondence
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The unique optical texture of coal is the most obvious visual features to distinguish coal and gangue. The current research represented the attempt to implement the multifractal analysis in the optical texture of coal and gangue. Firstly, fractal theory is applied to verify the multiscale characteristics of coal and gangue
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The unique optical texture of coal is the most obvious visual features to distinguish coal and gangue. The current research represented the attempt to implement the multifractal analysis in the optical texture of coal and gangue. Firstly, fractal theory is applied to verify the multiscale characteristics of coal and gangue
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28.8.2014· The properties of coal gangue. The main chemical compositions of coal gangue are SiO 2, Al 2 O 3, Fe 2 O 3 and CaO, which occupies 58, 24, 7 and 5 wt.%, respectively. According to the basic
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The coal gangue is one of the solid wastes in the coal mining process, and is also a concomitant low heat, high-ash carbonaceous rocks[1]. The coal gangue contains a variety of trace metals, sulfides and a lot of organic pollutants[2]. The coal gangue in leaching solution is bound to
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In this paper, we discussed the gangue on the mining area that have bad economic and environmental impact. It has been shown that the coal gangue accumulation could seriously prevent the regional ecological and economic sustainable development. Pollution control technology is the key to solve this problem. So we analyzed it and divided it into three categories: coal gangue prophylaxis and
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The analysis of coal determines the following aspects: 1. Measurement of moisture. The moisture content is being determine by placing a sample of powdered raw coal of size 200- micron in an uncovered crucible which is placed in the oven kept at 108 +2 °C along with the lid.
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15.12.2015· 2.2. Coal gangue fine aggregate activity analysis. Gangue mineral composition analysis was conducted using X-ray diffractometer. The coal gangue in 500, 600, 700, 800, and 900 °C temperature was calcined under 2 h and rapidly cooled to room temperature.The diffraction experiment was conducted according to the diffraction condition 325 to grind the coal gangue into powder.
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