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·Most mining engineers decide to extract pillars to decrease the loss of coal in room and pillar mining There are a few basic methods of pillar recovery and a number of variations for each among which the four techniques of pocket and wing open ending split and fender and Christmas tree are most widely practiced in the industry
·The lowest cost practical chemical extraction method for extraction of metals from host rock ore particles such as coal or minerals adjacent to coal seams is heap leaching Heap leaching begins after the metal bearing minerals are crushed to an appropriate size Miskovic S 2015 Extraction of REE from Coal—S203 UTA PPM4002 Mod 01
·The longwall technology is time tested method to coal extract deep seated coal deposits This technology can be customised to extract coal deposits of varying geological conditions On the other hand conventional CM technology in Bord and Pillar mining may not be economical to extract coal deposits below 500 m depth Also this technology can
·Due to the increasing demand for rare earth elements REE resources in the market and the shortage of their direct sources the research on REE in coal fly ash CFA has attracted the increasing attention of scholars because of its high content of rare earth To extract and separate REE from the leaching solution of CFA the method of solvent extraction after
·Aluminum was leached out from coal fly ash by pressure acid leaching method The effects of coal fly ash size sulfuric acid concentration reaction time and reaction temperature on extraction
·This paper explores the preparation of mesophase pitch by employing supercritical fluid extraction on coal tar pitch sourced from a coal chemical company The raw material undergoes pretreatment using various extraction solvents and the resulting refined components are thermally polycondensed in a laboratory microreactor to create mesophase
·The CMT can develop a virgin seam for coal extraction by the bord and pillar method The size of pillars left for withstanding the roof load is guided by the coal mine regulations Introducing CM in virgin seam depends on the mining method; once the entire specified block of 5 6 pillars is formed one can plan for depillaring Accordingly a
·Coal mining Extraction Processing Pollution In geologic terms coal is a sedimentary rock containing a mixture of constituents mostly of vegetal origin Vegetal matter is composed mainly of carbon hydrogen oxygen nitrogen sulfur and some inorganic mineral elements When this material decays under water in the absence of oxygen the carbon
·Bord and Pillar method of underground mining has been used extensively to develop Indian coal seams into pillars and galleries This results in only 20 30% recovery of coal and rest coal remain
·The extraction method of coal seam roof fractured gas As coal mine mechanization and working face advancement speed increase the problem of gas exceedance becomes more visible The roof fractured gas extraction technology is an effective means to break through the current dilemma and enhance the recovery rate of CBM The principle is that the
·Coal based graphite has become the main material of emerging industries The microstructure of coal based graphite plays an important role in its applications in many fields In this paper the effect of carbon disulfide/N methyl 2 pyrrolidone solvent mixture extraction on the microstructure of bituminous coal based graphite was systematically studied
·The modes of occurrence of Ga and Li in coal gangue were studied using a sequential chemical extraction procedure SCEP mineral phase composition time of flight secondary ion mass spectrometry TOF SIMS and elemental content composition The results indicate that the main mineral components of the coal gangue are mica quartz pyrite and
·Alumina was leached from coal fly ash using a mixed alkali NaOH Ca OH 2 through the hydrothermal effects of leaching conditions on the alumina were studied and the results showed that the alumina extraction ratio increased with increased reaction temperature calcium silicon ratio and liquid solid ratio
·The overall goal of this study is to develop a suitable flow sheet to extract rare earth elements REEs from coal ash A total of 14 coal samples of different ranks were examined for REE
·Aiming at the problems of difficult feature extraction and low recognition accuracy of coal and gangue this paper proposes a recognition method based on dielectric and geometric features which uses variational mode decomposition VMD to denoise the response signal to obtain its dielectric features; uses the marked watershed method to segment the
·The entity relation extraction of coal mine safety accidents is of great significance to the supervision and prevention of coal mine safety accidents Aiming at the entity relation joint extraction of coal mine safety accidents this paper proposes an entity relation joint extraction model based on multi heads attention and characters and words fusion On the
·The application of the CO 2 injection process for enhanced coal bed methane ECBM in coal formation depends on its permeability adsorption process chemical and physical properties of injection gas and coal seams such as injection pressure coal depth temperature and the rank of coal There are various challenges associated with the
·Therefore this study provides an alternative method of zero pollution discharge for simultaneous separation of Fe 3 and Al 3 and extraction of Fe from coal fly ash leachate Recycling of mullite from high alumina coal fly ash by a mechanochemical activation method Effect of particle size and mechanism research
·Liquid CO 2 injection into coal seam for CH 4 displacement is one of the important means to strengthen gas extraction and carbon sequestration in recent years Liquid CO 2 is a non polar solvent based on the principle of similar phase solubility part of non polar or weakly polar organic matter can be dissolved in liquid CO controlling the key
·This study aimed to develop an extraction method for desulfurizing coal with non toxic solvents before combustion Mixtures of sub/supercritical carbon dioxide and ethyl lactate EL were used at temperatures of 60 80 °C and extraction times of 15 45 min Box Behnken design BBD was used to assess the influence of the extraction
Abstract To explore the quantification method of infrared thermal image characteristics in the coal loaded damage process and better reflect the infrared precursor information and damage evolution of coal in this paper a new index based on the color extraction of thermal image pixel points infrared high temperature anomaly area ratio IHAR is proposed to quantitatively
·In India coal mining is conducted using two methods underground and opencast methods The underground method is suitable for extraction of deeper coal seams whereas opencast method is suitable
·However the low efficiency of conventional coal extraction methods is a major obstacle to the further advancement of this approach Therefore the research focus lies in effectively enhancing the extraction efficiency of small molecular phases in coal and optimizing the types and proportions of available organic matter compounds In order to
·Solvent extraction is a method for separation of materials of different chemical types and solubilities by selective solvent action It utilizes the fact that some materials are more soluble than others in certain solvents which results in preferential extraction The extraction of coal with hydrogen donor solvents at elevated temperatures
