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In a reliability assessment of hydraulic fracturing, the efficacy of hydraulic fracturing must be evaluated, and the source properties and magnitude of micro-earthquakes induced by hydraulic fracturing in a coal mine need to be quantified. Firstly, the changing trends of the number and energy of micro-seismic events induced by …
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Hydraulic support is an indispensable equipment for coal mining face. To detect the position and posture of the hydraulic support and automatically control its straightness at the mining working ...
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With increased production and more stringent regulations for air, water and ground pollution control, the safe and environmentally acceptable disposal of coal-mine refuse is becoming ever more demanding. Backfilling may provide an environmentally acceptable method for the disposal of waste materials. Increased resource recovery, enhanced ventilation control, …
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1.4.1 Criteria of Hydrogeological Classification. Methods and techniques for water control and management depend on the CSM of each mine. Based on their …
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Coal is a non-clastic sedimentary rock.They are the fossilized remains of plants and are in flammable black and brownish-black tones. Its main element is carbon, but it can also contain different elements such as hydrogen, sulfur and oxygen. Unlike coal minerals, it does not have a fixed chemical composition and crystal structure.Depending …
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The Hydraulic Classifier is made in 2, 4, 6, and 8 compartments with two sizes of compartments, namely 4″x 4″ and 8″x 8″. The standard units are of steel construction. Capacity depends on specific gravity of the material and range of size taken from each compartment. The 4″x 4″ has a capacity from 5 to 10 tons per compartment in …
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As a result both mineral and coal industries are looking forward to a more efficient and reliable separator for treating the fine size range particles. The recently developed …
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1.1.Classification of Surface Mining Methods 1.2. Open Pit vs. Underground Mining Methods 1.3. Open Pit Mining ... Highwall mining is a coal mining method for recovery of outcropped coal by mechanical ... either by hydraulic disintegration or physicochemical dissolution. Aqueous extraction includes:
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Research agrees well with the practical situation: the China's coal consumption decreases 2.9% in 2014, decreases 3.6% in 2015 and chain relative ratio flattens in 2016 [2].Because of China's economic transition and adjustment as well as the increasing emphasis on ecological and environmental protection, the high-strength and …
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Ningtiaota coal mine is located in Shennan mining area, its mining conditions are mainly characterized by shallow depth (less than 200 m), nearly horizontal (1°–3°), and thick red soil is ...
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The Chengjiao Coal Mine. The Chengjiao Coal Mine is located in the eastern part of Yongcheng City in Henan Province, China (Fig. 1).The II 2 coal seam is the primary mineable seam, with an average thickness of 2.84 m, and provides a production capacity of 5.0 Mt/a for the mine. Geologically, the elevation of the main mining seam ranges from − …
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The mining machine classification is reported by the mining operator, analytically connected to source of injury when machinery is involved in an accident. CODE DESCRIPTION 01 Aerial tram, tramway 02 Air compressor 03 Air transportation, planes, helicopter, etc. 04 Auger machine (coal) surface and underground 05
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Rock burst is one of the major dynamic disasters that directly threaten production safety in coal mines. According to the current research, the occurrence of rock burst can be described by the generalized Newton’s second law with three elements which are research object, force condition, and motion state. These three elements refer to the coal …
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The ratio between combustible organic matter and inorganic impurities of coal is also one of the variables in coal classification. Coal gangue is a significant residue of coal mining and cleaning, which accounts for ... high frequency screens, and banana screens. For fine particles, hydraulic classification using hydrocyclones is generally ...
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Auger mining. This is a method to recover additional coal from under the highwall of a contour mine, when the ultimate stripping ratio has been achieved in open cast operations. It is sometimes referred to as secondary mining because it is done after the open cast mine has reached an economic limit. Aqueous Methods Hydraulic mining
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TRIPATHY S K, BHOJA S K, KUMAR C R, SURESH N. A short review on hydraulic classification and its development in mineral industry [J]. Powder Technology, 2015, 270: 205–220. ... Key technologies of integration of coal mining-gangue washing-backfilling and coal mining [J]. Journal of China Coal Society, 2014, 39(8): 1424–1433. …
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Indian classification, coal seams having a thickness of 4.8m or more are termed as thick. The thick seam was not uniquely defined globally, different countries have defined on their own way as per the country specific conditions, as ... Hydraulic mining 3. stThe 21 Century era (year 2000 and beyond) i. Bord and system base ii.
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The collapse of overlying rocks caused by the instability of residual coal pillars during lower coal seam mining significantly impacts its safety. This paper focuses on the gentle dipping coal seam group and utilizes the discrete element method (DEM) as the basis to comprehensively consider multiple factors through orthogonal experiments. In so …
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Coal structure directly correlates to permeability and hydraulic fracturing effects. Underground coal mining indicates that a single coal section generally contains multiple coal structures in superposition, making how to recognise the coal structure combination and predict its influence on coal permeability a challenging problem. Based …
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Over the last several decades, a series of stimulation techniques were developed to enhance tight oil and gas reservoir, including enhanced coalbed methane (ECBM) recovery [].The hydraulic techniques, such as hydraulic fracturing, hydraulic slotting, and hydraulic punching, are probably the most widely used in the ECBM, which …
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Comprehensive mechanized top coal caving mining technology is the key technology for mining thick and extra-thick coal seams in China. With the rapid development of artificial intelligence ...
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In this study, experiments are performed to investigate the classification performance of coal slime. Both high-density gangue and low-density coal are considered in simulating the multi-component system of coal slime.
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Longwall mining is one of the most applicable and effective production methods for underground coalmines. Longwall mining is attractive for producers due to its high production rate (Galvin 2016).Mechanized longwall mining requires heavy machinery and equipment that are shearer for coal cutting, hydraulic shields for roof control, and …
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A short review on hydraulic classification and its development in mineral industry | Semantic Scholar. Semantic Scholar extracted view of "A short review on hydraulic …
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Development of conceptual site models (CSMs) will provide necessary guidance for further improving the safety records in coal mining. A CSM is a description of relationships between sources and receptors under both natural and man-made environments based on existing knowledge (Zhou and Lei 2017).It describes sources of …
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This work develops an image dataset of underground longwall mining face (DsLMF+), which consists of 138004 images with annotation 6 categories of mine …
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To achieve a targeted production level in mining industries, all machine systems and their subsystems must perform efficiently and be reliable during their lifetime. Implications of equipment failure have become more critical with the increasing size and intricacy of the machinery. Appropriate maintenance planning reduces the overall …
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In Australia so-called "hydraulic mining" was used in open pit mining 16 with hydro-monitors of mining effectiveness at the level of 500 Mg/h and water pressure from 1.0 to max. 4.0 MPa ...
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The accurate classification of coarse coal slime is the premise of efficient separation. Deep Cone Hydraulic Classifier (DCHC) is a new classification equipment for coarse coal slime classification, the content of fine particles (-0.2 mm) in coarse coal slime can be effectively reduced through classification, so as to create suitable feeding …
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The total coal reserves threatened by bodies of water are estimated at 25 billion tons. During seam extraction from those coal mines, water inrushes from aquifers into the mining area have caused serious water disasters in China (Table 1). The consequences sometimes were dramatic and could lead to partial or even total loss of a mine.
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