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  • Experimental and numerical study on the effect of calcite on

    2016.3.15  The numerical results suggest that the presence of calcite grains significantly increase the heterogeneities of the coal, leading to differential and extensional straining which in turn causes internal tensile stresses and consequently tensile cracking.

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  • Coal beneficiation: theory and practice - ScienceDirect

    2023.1.1  Although the theoretical knowledge of coal beneficiation is available aplenty in coal preparation books; it is essential that mineral processing engineers also possess basic knowledge regarding selection of process equipment, key operational factors, problems encountered in plant operations, and their troubleshooting strategies.

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  • Evaluating the impact of calcite and heterogeneity on the

    2024.2.21  It is found that the presence of calcite in a coal sample increases Young's modulus and decreases the peak strength of coal. This research uses Voronoi tessellation technology to present a Weibull statistical grain-based model (GBM) to investigate the microstructural heterogeneity induced by grain morphologies.

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  • Mineral Beneficiation and Processing of Coal SpringerLink

    2021.5.11  1 Citations. Abstract. Coal plays a vital role in steel production and electricity generation. In recent times, coal production has been increased multiple times as the demand for steel and energy increased. Presently, about 41% of the world’s electricity requirements are met by thermal coals.

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  • Progress in developments of dry coal beneficiation

    2014.8.21  This paper systematically reviewed the promising research efforts on dry coal beneficiation reported in literature in last 5 years and discussed the progress in developments of dry coal beneficiation

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  • Experimental and numerical study on the effect of calcite on ...

    2016.3.1  The numerical results suggest that the presence of calcite grains significantly increase the heterogeneities of the coal, leading to differential and extensional straining which in turn causes internal tensile stresses and consequently tensile cracking.

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  • Clean Coal Technologies: Beneficiation, Utilization, Transport ...

    Overview. Editors: Rajesh Kumar Jyothi, Pankaj Kumar Parhi. Describes mineral beneficiation of coal through physical-chemical processes. Examines rheological behavior and pipeline transport of coal water slurry resulting in

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  • Influence of coal properties on coal conversion processes-coal ...

    2021.2.8  Calcite minerals found in cleats or fracture infillings reduces the inter-granular stresses between particles and this affects the frictional and cohesion strength of coal by increasing coal porosity and permeability (Ward 2002; 2016; Susilawati and Ward 2006; Lebedev et al. 2014). However, under dry conditions calcite minerals improve

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  • Experimental and numerical study on the effect of calcite on

    2016.3.15  The numerical results suggest that the presence of calcite grains significantly increase the heterogeneities of the coal, leading to differential and extensional straining which in turn causes internal tensile stresses and consequently tensile cracking.

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  • Trace Elements During the Mining and Beneficiation of Coal

    2007.5.16  The removal of much of the pyrite in coal means that consideration must be given to pyrite-enriched wastes. The removal of most trace elements by beneficiation is an environmental bonus. Proper control of wastes during mining and beneficiation should overcome potential problems from the mobilisation of trace elements.

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  • the effect of calcite on coal beneficiation

    2021.4.1 The combined effect of inherent pyrite and calcite in coal on the as-prepared AC’s texture and SO 2 and/or NO removal performance was discussed. The . consulter en ligne; Effects of clay and calcium ions on coal flotation - ScienceDirect. 2013.9.1 Abstract. The microflotation of three single minerals, mixed coal–kaolinite and mixed ...

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  • The effect of coal beneficiation and swelling on liquefaction

    1995.10.1  Liquefaction experiments were undertaken using subbituminous Black Thunder mine coal to observe the effects of aqueous SO 2 coal beneficiation and the introduction of various coal swelling solvents and catalyst precursors. Aqueous SO 2 beneficiation of Black Thunder coal removed alkali metals and alkaline earth metals,

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  • Ultrasonic-assisted coal beneficiation: A review - ScienceDirect

    2019.1.1  The coal slurry was pre-treated with ultrasound for different time intervals (0–180 s) at 25 kHz frequency before flotation. A higher clean coal yield of 67% was attained at a pre-treatment time of 30 s during ultrasonic-assisted flotation, while only 59% clean coal yield was attained during conventional flotation.

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  • The Effect of Vibration on Dry Coal Beneficiation in the

    2010.11.23  The mineral means that coal its differ from the other minerals due to the different properties and heterogeneity character basically coal is divide four category i.e peat, bituminous, lignite and ...

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  • Clean Coal Technologies: Beneficiation, Utilization, Transport ...

    Describes mineral beneficiation of coal through physical-chemical processes; Examines rheological behavior and pipeline transport of coal water slurry resulting in reduction of overall transportation cost of coal; Illustrates synergistic effect of natural and synthetic mixed surfactant system in the stabilization of high concentration coal ...

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  • Studies on the Effect of Coal Beneficiation on Ash

    2013.12.10  The coal samples, characterized by XRD analysis revealed that the peak intensities for different minerals change with the types of processes adopted for beneficiation. Discover the world's ...

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  • The effect of coal beneficiation and swelling on liquefaction

    DOI: 10.1016/0378-3820(95)00031-2 Corpus ID: 97672502; The effect of coal beneficiation and swelling on liquefaction behavior of Black Thunder coal @article{Brannan1995TheEO, title={The effect of coal beneficiation and swelling on liquefaction behavior of Black Thunder coal}, author={Charles J. Brannan and Christine W. Curtis and Donald Charles

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  • A Review on the Beneficiation Methods of Borate Minerals

    2021.3.19  The modern boron applications have adsorbed the mineral processors’ attention to improve typical boron mineral’s (BM) beneficiation methods. In this regard, dry treatment and pretreatment processes—such as magnetic separation and calcination as environmentally friendly methods, due to their minimal or zero adverse effect on the

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  • Coal Beneficiation via the Tapered Fluidized Bed Using

    2020.2.27  A gas–solid fluidized bed using magnetite particles is an effective methodology for coal beneficiation in the field of dry coal cleaning. Broadening the size range of magnetite used in the bed decreases medium preparation cost. In this study, a tapered fluidized bed was used to investigate a magnetite particle size range of −0.5 +

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  • Recent advances in beneficiation for low rank coals

    2015.6.1  Coal beneficiation is one of the most effective methods for removing minerals (such as gangues and pyrite) and pollutants (such as sulfur) before the burning of coal. In general, the beneficiation process of low rank coals is more difficult to achieve than that of bituminous and/or anthracite coals. However, about 50% of the world's total coal ...

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  • Effect of a high-density coarse-particle layer on the stability

    2014.11.10  1. Introduction. Coal consumption accounted for 70.48% of the primary energy consumption (IBGE Census, 2011).In 2011, China's raw coal production was 35.2 million tons, which accounted for 77.35% of the primary energy production (National Bureau of Statistics of China, 2012).Coal is the main energy supply in China, and this situation

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  • A comparative study on the mineralogy, chemical speciation,

    2018.9.15  The huge demand for high-quality coal in China has resulted in increased generation of preparation plant wastes of various properties. A series of beneficiation products collected from a preparation plant were characterized to understand their petrographic and mineralogical characteristics, as well as thermochemical and trace

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  • Effect of chemical conditioning on the triboelectrification of coal

    2010.5.1  Received 16 September 2009; accepted 30 December 2009 *Corresponding author. Tel: 86 516 83885384 E-mail address: [email protected] doi: 10.1016/S1674-5264(09)60219-2 Effect of chemical conditioning on the triboelectrification of coal and mineral particles WANG Haifeng 1,2,* , CHEN Qingru 1,2 , ZHANG Xinxi 1,2 ,

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  • Recent process developments in beneficiation and

    2024.4.1  Abstract. Rare earth elements (REEs) are irreplaceable materials supporting low-carbon technology and equipment, and their commercial demand and strategic position are becoming increasingly prominent. With the continuous depletion of rare earth (RE) resources, developing high-efficiency beneficiation and eco-friendly metallurgical

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  • Minerals Free Full-Text Review on Beneficiation

    2019.4.25  Phosphate ore is an important raw material for manufacturing fertilizers and phosphorous chemical products. While most of the phosphate resources cannot be directly treated as feed stock due to the low grade of P2O5 and high content of impurities. In order to obtain a qualified phosphate concentrate, the beneficiation of the low-grade

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  • Effect of Fluoride Ion on the Separation of Fluorite from Calcite

    2021.10.28  As a common depressant, acidified water glass (AWG) has strong inhibitory effects on fluorite and calcite. The inhibited fluorite is difficult to be recovered, thus resulting in the waste of resources and low flotation efficiency. In this study, the interaction of fluoride ions with fluorite and calcite surfaces was investigated, and its effects of AWG

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  • Coal Beneficiation 19 Coal Production and Processing

    Coal beneficiation is now recognized as a combination of science, art, and engineering, recognized in its own right as a vital link between the production and marketing of coal. Abstract: As it comes from the mine, coal is known as run-of-mine (ROM) coal and consists of a range of sizes from chunks to small particles mixed with some.

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  • Recent advances in fine coal beneficiation Mining,

    The quantum of coal fines below 6 mm in run-of-mine (ROM) coal has been increasing due to progressive mechanization of mining methods which has created a substantial incentive, worldwide, to develop suitable fine coal beneficiation techniques. The majority of the efforts have been directed toward reduction in ash/sulfur contents in clean coal. The

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  • Coal beneficiation processes 29 Coal Processing and

    The coal beneficiation plants using wet processes are named as Coal washeries. For raw coal fines of –0.5 mm, the difference in surface property is utilized since conventional gravity dependent processes are inefficient for this size range. The commercial processes of coal beneficiation are based on the differences in some physical properties ...

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  • A comparative study on the mineralogy, chemical speciation,

    2018.5.4  The huge demand for high-quality coal in China has resulted in increased generation of preparation plant wastes of various properties. A series of beneficiation products collected from a ...

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  • Effects of Pb2+ ions on the flotation behavior of scheelite, calcite ...

    2022.1.2  Pb 2+ ions could slightly activate scheelite flotation in the presence of water glass.. Pb 2+ ions could enhance the depression effects of water glass on calcite and fluorite flotation.. Pb 2+ ions combined with W‐O bond to form W-O-Pb 2+ structure on scheelite surface, which increased NaOl adsorption.. Pb-water glass and water glass combined

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  • Dry coal beneficiation technique in the gas–solid fluidized

    2019.10.25  The pseudo-fluid characteristics of the gas–solid separation fluidized bed provide a set of feasible methods for the dry separation of coal. The equipment used in the development of dry separation technology is receiving increasing attention around the world, because it generates no pollution during the separation process.

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  • Trace Elements During the Mining and Beneficiation of Coal

    1998.7.1  Relevant published information is reviewed and assessed for the effects of mining and beneficiation on trace elements in coal. In general, the concentrations of those elements associated with mineral matter are decreased to varying degrees depending on coal properties and beneficiation processes. The removal of much of the pyrite in coal

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  • Coal beneficiation: theory and practice - ScienceDirect

    2023.1.1  Abstract. Coal is a physical mixture of high carbon value coal and rejects. Coal beneficiation is nothing but the separation of these high carbon value coal from rejects (noncarbonaceous material) in a coal body. Although the theoretical knowledge of coal beneficiation is available aplenty in coal preparation books; it is essential that mineral ...

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  • The effect of mineral additions on coal ash deposition

    2007.12.1  The addition of calcite appeared to have the greatest effect on the degree of deposit sintering. Both albite and calcite were selected as additives to investigate in the second phase of EFR trials and in the CTF trials; Daw Mill coal was chosen because both additives had increased the mass of Daw Mill ash deposited. 3.2. EFR trials phase 2

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  • Reverse calcite flotation applied for the beneficiation of the

    2024.5.1  Calcite and quartz are naturally hydrophilic; hence the usage of a collector is needed for a successful limestone beneficiation. Reverse flotation is an attractive option for the Queguay limestone since impurities are mainly constituted by quartz minerals and represent a minor fraction of the rock.

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  • Review of the reagents used in the direct flotation of phosphate ores ...

    Beneficiation of low-grade phosphate deposits through direct froth flotation has captured more attention to satisfy the future needs of phosphorous industry. This is owing to the excessive consumption of the global reserves of high-grade phosphate deposits. Phosphate flotation using mixed collectors has been proved to give greater selectivity and high

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  • Experimental and numerical study on the effect of calcite on ...

    2016.3.1  Abstract The effects of the presence of calcite grains on the mechanical behaviour of a coal are investigated in this study. Coal specimens with and without calcite grains were obtained from the same coal seam and then subjected to confined compression with varying confining pressures.

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  • Numerical study on the effect of fine coal accumulation in a coal ...

    2015.10.1  The coal beneficiation fluidized bed (CBFB) technology is a dry method developed in recent decades for coal beneficiation. In CBFB, the medium solids are fluidized by supplied gas to generate a pseudo-fluid state. Light and heavy species of raw coal will stratify in such a state according to their density differences.

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  • Minerals Free Full-Text Sustainable Use of Copper

    2022.4.27  The global market has announced copper as a modern energy metal and finds its extensive utilization in the construction industry, electrical wiring, power transmission lines, alloying, anticorrosive coating, heat exchangers, refrigeration tubing, etc. Copper ore is primarily beneficiated from sulphide mineral deposits. Due to high-grade

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