determination method of coal mining

2016年2月14日  The mining method selected for exploitation is determined mainly by the characteristics of the coal deposit and the

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  450-500T/H

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2020年11月1日  The determination of coal seam gas content is one of the fundamental key works involving the regional prediction of coal and gas outburst, validity check of

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  450-500T/H

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2023年6月14日  Subsidence data acquisition methods are crucial to mining subsidence research and an essential component of achieving the goal of environmentally friendly

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  450-500T/H

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2023年6月1日  Firstly, the method obtains the data of coal mine gas OL, determines the key data required in prediction through decision matrix, and preprocesses the data to

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  450-500T/H

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The prediction model of total sulfur in coal is established by using a multivariate linear fitting method through geophysical logging parameter values, which can provide a method for comprehensively quantifying the

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  450-500T/H

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2014年2月1日  In addition to recent organic carbon (OC) from humification of plant residues, minesoils formed from reclamation of surface mining of coal often contain

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  450-500T/H

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2023年12月11日  Studies conducted are mainly focused on developing weights determination methods for decision factors. Up till now, the commonly used methods

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  450-500T/H

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2021年7月7日  To achieve this objective, the main requirement is to maintain the stability of waterproof coal pillars. Many methods to analyze the stability of coal pillar have been

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  450-500T/H

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2014年2月1日  Methods for determination of coal carbon in reclaimed minesoils: A review Analytical methods for quantifying carbon of different sources in reclaimed mined lands.

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  450-500T/H

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2023年12月9日  This paper conducts impact dynamics experiments on coal measures sandstone in a deep mine via the established dynamic load and temperature split

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  450-500T/H

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2019年4月29日  The study is devoted to the methane hazard in hard coal mining. This hazard occurs in almost every coalfield in the world. Ensuring maximum work safety under methane hazard conditions is based, among other things, on reliable, fast and frequent determinations of methane content in a coal seam. The existing methods are time

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  450-500T/H

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2023年3月17日  In view of the problems of heavy work, long cycle, high cost and low efficiency in the process of indirect determination of coal seam gas content, the basic gas parameters and coal quality indexes of

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  450-500T/H

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for safe mining, but also to quantify potential greenhouse gas emissions from mining. In Australia the gas content of coal is determined using a direct method, whereby the gas desorbed from solid or crushed coal is collected and the volume and composition of the desorbed gas are measured. The determination of gas content is associated with ...

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  450-500T/H

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3. Direct versus indirect gas content determination methods 3.1. Direct methods The gas content of a coal sample can be determined by several available direct measurement techniques. These techniques can generally be divided into quick-crushing and extended desorption determination methods. The quick-crushing techniques are most

• Capacity

  450-500T/H

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Bureau of Mines Report of Investigations/l981 Direct Method Determination of the Gas Content of Coal: Procedures and Results By W. P. Diamond and J. R. Levine UNITED STATES DEPARTMENT OF THE INTERIOR

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  450-500T/H

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Semantic Scholar extracted view of "Determination and prediction on “three zones” of coal spontaneous combustion in a gob of fully mechanized ... Coal mining is frequently halted for long periods of time due to ... IMPROVEMENT OF SPONTANEOUS COAL COMBUSTION FORECAST METHODS IN COAL MINES. S. Tsibaev I. Kravchenko D. Zorkov. ...

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  450-500T/H

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2019年1月2日  These determination methods basically determines the final height or the highest height of the caving zone after longwall mining however, whereas in fact, the boundary roof of the caving zone is not flat, but has a certain dip angle (Bai et al. 2017), and with roof subsidence, the caving zone basically assumes a saddle-shaped distribution.

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  450-500T/H

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A compre- residues, minesoils formed from reclamation of surface mining of coal hensive review on the geochemistry of BC and measuring techniques often contain varying quantities of coal particles distributed throughout was published (Masiello, 2004), and an inter-laboratory comparison the soil profile depending on mining and reclamation techniques

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  450-500T/H

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2020年8月11日  In this study, the gross calorific value (GCV) of coal was accurately and rapidly determined using eight artificial intelligence models based on big data of 2583 observations of coal samples in the Mong Duong underground coal mine (Vietnam). Accordingly, the volatile matter, moisture, and ash were considered as the key variables

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  450-500T/H

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2017年4月1日  Section snippets Principle. The modified direct method for determination of gas content of coal with coal cuttings is similar to that with coal core, i.e. it involves the determination of three gas components: lost gas Q 1, measurable gas Q 2, and residual gas Q 3.In this modified method, coal is sampled by collecting cuttings from an

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  450-500T/H

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2015年12月19日  Semi-quantitative environmental impact assessment and sustainability level determination of coal mining using a ... EIA of the Eastern Alborz Coal Mining complex using the matrix method, ...

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  450-500T/H

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2021年11月30日  The determination of methane content of coal seams is conducted in hard coal mines in order to assess the state of methane hazard but also to evaluate gas resources in the deposit. In the world’s

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  450-500T/H

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2002年1月1日  Cowherd (1982) and USEPA (1995) have derived empirical formulae for the determination of emission rates for western surface coal mining activities. However, the rate of emissions from Indian mines are different from those of USA due to the distinctively different geo-mining conditions, site practices and prevalent micro-meteorological

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  450-500T/H

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2021年2月13日  The determination of natural gas content in coal seams is essential to safe mining activities and to estimate gas resources. It is used to estimate methane emissions into workings, which is very ...

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  450-500T/H

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2008年1月15日  @article{osti_21005004, title = {Method for determining coal carbon in the reclaimed minesoils contaminated with coal}, author = {Ussiri, D A.N. and Lai, R}, abstractNote = {Minesoils developed on the reclaimed surface-mined sites for coal are contaminated with coal particles resulting from mining and reclamation activities. .

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  450-500T/H

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2022年12月5日  Coal gangue is the main solid waste in coal mining areas, and its annual emissions account for about 10% of coal production. The composition information of coal gangue is the basis of reasonable utilization of coal gangue, and according to the composition information of coal gangue, one can choose the appropriate application

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  450-500T/H

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2019年5月16日  Mechanical coal mining, full seam mining and roof management in the caving method are adopted as a whole. The No. 5 coalbed has stable reserves with an average thickness of 4.2 m and average dip angle of 3°.

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  450-500T/H

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The Review concluded that with few exceptions, at depths of cover greater than about 200 m coal cannot be mined economically by any mining method without causing some degree of surface subsidence. If mining of hard coking coal in the Southern Coalfield is to continue, then a certain level of subsidence impact must be accepted as a necessary outcome of

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  450-500T/H

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2018年10月19日  In particular, the selection of the PCS mining thickness directly affects the performance of pressure relief mining. The determination of the PCS mining thickness is generally related to the factors such as the dip angle of coal seam, the depth of the coal seam, interlayer spacing, the lithology of interlayer rock, the key stratum and so on ...

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  450-500T/H

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2022年6月1日  Weight determination method. In this study, ... Aiming at the problems of collapse area, from the perspective of ground collapse caused by coal mining, appropriate coal mining methods combining partial backfilling mining technology can be used to prevent surface collapse and slow down surface collapse.

• Capacity

  450-500T/H

• Reviews