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·The Liyazhuang Coal Mine is located on the southern edge of the Huozhou Coalfield in China s Shanxi Province Fig 1 The length of the coalfield from west to east is approximately km and its width from north to south is approximately 4 km with total area measuring approximately km Liyazhuang Coal Mine is identified as a gassy coal mine
·This process was further aided by considering factors like potential adjacent coal mines for coke supply of iron smelters or areas within surrounding zones of mineralization such as faults
The Global Coal Mine Tracker GCMT is a worldwide dataset of coal mines and proposed projects The tracker provides asset level details on ownership structure development stage and status coal type capacity production workforce size reserves and resources methane emissions geolocation and over 30 other categories The most recent release of this data
5 ·Despite record profits for producers there is little appetite for more investment in coal mining assets The record highs for coal prices seen since October 2021 and a renewed focus on energy security since Russia s invasion of Ukraine might have been expected to drive an uptick in investment in coal mine assets However outside China and
·In China gassy mines account for 51% of the total underground mines and gobs are regularly produced at a rate of × 10 8 m 2 per year Wang et al 2012; Hu et al 2018 A large proportion of those gobs are classified as abandoned gobs due to exhausted coal resources and engineering technical or geological limitations Karacan 2015a b; Zhang et
In surface mining the ground covering the coal seam the overburden is first removed to expose the coal seam for extraction The elements of a surface mining operation are 1 topsoil removal and storage for later use 2 drilling and blasting the strata overlying the coal seam 3 loading and transporting this fragmented overburden material called spoil 4 drilling and blasting the
·In the process of coal gangue surface accumulation and underground filling disposal the heavy metals contained in coal gangue will inevitably precipitate out and migrate which will cause serious environmental pollution Seventy five gangue samples of different geological ages are obtained from 25 coal mines in China The contents of Hg Pb Cd Cr As
·Moreover Jiang et al designed an experimental model roadway according to the motion equation of gas solid two phase flow to study the distribution of coal dust during mining Liao et al adopted a CFD DPM method to study the dust distribution around the driver Hu et al 2019
·Monitoring heavy metals HMs across source distance and depth distribution near coal mining sites is essential for preventing environmental pollution and health risks This study investigated the distribution of selected HMs cadmium Cd2 chromium Cr2 copper Cu2 manganese Mn2 nickel Ni2 lead Pb2 and zinc Zn2 in soil samples
·This paper numerically examines the ventilation performance of the working coal face section of an underground mine exposed to methane gas under the influence of an auxiliary ventilation auxiliary ventilation system consists of a brattice and an exhaust ducted computational model using the commercial software package ANSYS is developed
· IntroductionIn the past 30 years coal separation plants in the mining industry of Australia have expanded toward increased number of parallel modules Kelly 1999 rather than using high capacity units in a single coal distributor is necessary to split raw coal for subsequent parallel modules
·Globally studying the impact of coal mining on groundwater remains challenging This is because the exploitation of coal resources and the sustainable development of groundwater resources involve economic social and environmental aspects Over the last few decades the number of publications on groundwater related studies in coal mining areas has
·Coal flow distribution When the classifier speed was modified online two effects were observed on the measured coal flow rates a transient discrepancy between the flow rate fed to the mill by the coal feeder and the total flow rate sent to the burners and a modification of the coal flow distribution between the burners
·The so called sputnik hydraulic distributor is widely employed to mix run of mine and water in the first stage of coal separation process almost 40% of Australia s washed coal passes through a sputnik distributor In the operation the coal materials carried by a conveyor belt are fed into the distributor through its top and water
·Coalbed methane is an important clean energy The geological resources of coalbed methane in China reach trillion m 3 of which the coalbed methane resources in coal mining areas exceed 16
·Finally movement characteristics and distribution law of dust particles in open pit coal mines were obtained through comprehensive analysis which provided new ideas and basic references for dust
·Overview of the research area The research area is located in Shigetai Coal Mine in the north of Loess Plateau of Northern Shaanxi on the southern margin of Maowusu Desert Fig 1 The coal field
·The increasing depth of mine excavation presents greater challenges in mine ventilation and in managing cooling energy consumption Therefore there is an urgent need for comprehensive research on
· Open pit mining 8 Underground coal mining 9 Room and pillar 9 Longwall 12 South African coal mining context 13 History of the South African coal mining industry 13 Current status of coal mining in South Africa 15 The role of South African coal market plays globally 18 Purpose of the study
A variety of dust control methods are often applied in coal mines among which the application of wet scrubbers has proven to be an efficient technology for the removal of dust in airstreams rather than diluting or confining the dust In this paper a wet scrubber design was developed Based on a self designed experimental test platform the total dust concentration respirable
·Mine ventilation energy consumption is one of the main sources of energy consumption in mining production accounting for about one third to one half of the total energy consumption Therefore reducing the energy consumption of the mine ventilation system is crucial for mining production With the premise of meeting the airflow requirements of the
·It can be clearly seen from the overall spatial distribution of roadway space in Fig 7 that when airflow passed through the coal mining area and moved into the support moving area of m the coal mining space was increased and obvious air leakage was generated at the connection between the support moving area and the goaf In the presence
·The water rich burnt rock may threaten the safe production of coal mines Identifying the boundaries of burnt rock and the water rich area is of great practical significance for the ensuring the
·Coal mine drainage CMD reuse is an important method for optimizing water resource supply in arid/semi arid regions This study analyzed the spatial distribution of water quality management and utilization strategies for CMD in China In northwest northeast and north China CMD was characterized by high levels of suspended solids high salinity
