Evaluation of the Liberation Characteristic of Coarse
In this paper, the size-density distribution of coarse middling coking coal (CMCC) with different grinding fineness and flotation concentrates was investigated. Then, the flotation behaviors and liberation characteristics of different size-density fractions in ground CMCC were analyzed, and the different size-density fractions were divided into …
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Diverse utilization of surfactants in coal-floatation for the
Several studies on coal flotation using different surfactants having different HLB values suggested the suitable properties of reagents, which are the key to enhancing both the flotation performance and dewatering process. 84 The efficiency of flotation separation was found to be the highest in the case of traditional gigantic oily collectors ...
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Effect of Nanobubbles on the Flotation Performance of Oxidized Coal
The flotation mechanism revealed that the presence of nanobubbles significantly increased the wrap angle of oxidized coal particles from 196° to 232° and shortened the bubble-oxidized coal particle induction time from 1000 to 39 ms, promoted particle and bubble aggregation, allowing oxidized coal to be more efficiently recovered.
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Deep learning-based ash content prediction of coal flotation
Coal flotation is a critical separation technology in fine coal cleaning [1], [2]. Ash content, as the important indicator of coal flotation, is obtained by sampling, filtrating, drying, sample preparation, and burning. [3], [4]. The result of concentrate ash content determines the efficiency of the coal flotation process.
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A Comparative Study on Flotation of Coal Using Eco …
It can be observed that most of the coal flotation process involves the usage of a dual reagent system (collector and frother) like hydrocarbon oils and chemically synthesized non-environment friendly collector and frothers. In this study, a single reagent, Collector AB, as an alternative to two reagent practices was developed from a natural ...
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Physical and chemical interactions in coal …
Abstract. Coal flotation is a complex process involving several phases (particles, oil droplets and air bubbles). These phases simultaneously interact with each other and …
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Kinetics of Flotational Enrichment for Coal with Elevated
Abstract The influence of four factors—the reagent consumption, the pulp density, the content of fine slurry in the coal pulp, and the flotation time—on the flotation of coal fines at MMK-Ugol is studied by means of a full factorial experiment. First-order regression equations are obtained by simulation; the response functions selected in these …
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Coal flotation in inorganic salt solutions
@article{osti_7052037, title = {Coal flotation in inorganic salt solutions}, author = {Yoon, R. H. and Sabey, J. B.}, abstractNote = {In the present work, the salt flotation technique has been tested with 27 different inorganic electrolytes on two high ash coal samples. The performance of various salt solutions were compared in terms of the separation efficiency.
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3. Novel reagents for the modernisation of coal …
Amongst the many established technologies, flotation pre-treatment is the most common and effective method used worldwide due to its lower energy input than other methods. In this review, we attempt to present an up-to …
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Physical and chemical interactions in coal flotation
Coal flotation is a complex process involving several phases (particles, oil droplets and air bubbles). These phases simultaneously interact with each other and with other species such as the molecules of a promoting reagent and dissolved ions in water. The physical and chemical interactions determine the outcome of the flotation process.
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Switching and optimizing control for coal …
Flotation is an important part of coal preparation, and the flotation column is widely applied as efficient flotation equipment. This process is complex and affected by many factors, with the froth depth …
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Coal Flotation | SpringerLink
Coal flotation of fine material has both economical and environmental benefits by recovering as much coal as possible from run-of-mine coal and by reducing air and …
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Kinetics of Flotational Enrichment for Coal with …
In the flotation of coal containing fine slurry, flotation is slowed and the extraction of combustible mass in the concentrate is decreased. The decrease in yield …
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Coal Flotation
Coal Flotation - an overview | ScienceDirect Topics. As in coal flotation, oil agglomeration takes advantage of the difference between the surface properties of low-ash coal and high-ash gangue particles, and can cope with even finer particles than flotation. …
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Discrimination of Six Flotation Kinetic Models Used in the …
Flotation is one of the most efficient methods for the beneficiation of fine ores and coal. 1 However, there is considerable evidence that both flotation recovery and rate constant decline steadily as particles fall below a critical size. 2 In general, the highest flotation rate constant and recovery of coal are seen on particles of an ...
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New insights into the slime coating caused by montmorillonite in …
Effect of slurry pH and collector dosage on flotation of the coal with or without montmorillonite. The results of the flotation tests are shown in Fig. 3. It can be seen from Fig. 3 (a) that, in the absence of montmorillonite, the flotation recovery of coal is quite high at about 86% and does not change as the slurry pH increases from 2.7 to 6.5.
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Effect of particle shape on the flotation kinetics of fine coking coal
Understanding the role of coal particle shape in the flotation process is helpful in achieving a clean usage of coal slime flotation. In this investigation, the anthracite coal surface was modified using a chlorinated salt solution containing Na +, Ca 2+, or Fe 3+.Coal particles with four surface shapes were prepared: angular coal particles (ARPs), …
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Microbubble Flotation
Characterization and preparation of biomass, oil shale and coal-based feedstocks. O. Trass, in Advances in Clean Hydrocarbon Fuel Processing, 2011 Microbubble flotation. When adequate liberation of the mineral matter in coal can only be obtained at very small particle size, e.g. in the 10μm range, a truly ultrafine size, conventional flotation will be inefficient, …
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Flotation kinetics performance of different coal size
The improvement of flotation speed on fine coal particles (−0.074 mm) is prob-ably the reason for the improved performance of raw sample flotation. Keywords: coal flotation; different size fraction; flotation kinetics models; nanobubbles 1. Introduction Flotation is the most efficient separation method in fine
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Switching and optimizing control for coal flotation …
Flotation is an important part of coal preparation, and the flotation column is widely applied as efficient flotation equipment. This process is complex and affected by many factors, with the froth depth …
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Choosing mineral flotation collectors from large
As the poor dispersion of oily collectors and the inferior hydrophobicity of the mineral surface, the low-rank coal has an unsatisfactory flotation performance when using traditional collectors. In this paper, an ionic liquid microemulsion was used as a collector to enhance its floatability. Flotation test results demonstrated the microemulsion ...
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Composition and dynamics of bacterial communities during flotation …
The composition of bacterial community in the flotation environment is the basis for further analysis, so raw coal (RC), flotation feed (FF), mine water (MW), and circulating water (CW) were sampled, and a total of 12 samples were collected in three parallel samples at each location to ensure the reliability of the data.
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Advances in depressants used for pyrite flotation separation from coal
3.1 Coal pyrite depressants. Although the contact angle is smaller and the induction time of coal pyrite is longer than those of coal (Qi et al. 2019), coal pyrite has better floatability than ore pyrite due to the doping of C atoms.Efficient depressants are needed to inhibit the floatability of pyrite in the flotation separation of coal and pyrite.
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Effect of water chemistry on froth stability and coal flotation
In this study, the coal flotation was performed in the solutions MgCl2, NaCl, and NaClO3. In addition to the flotation tests, the froth stability, bubble size and films were also studied to ...
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The result of surfactants on froth flotation of unburned …
The flotation of either coal particle or partially oxidized carbon requires the addition of surfactant to reduce the amount of oily collector, in order to yield a sufficiently high recovery of carbon and an effectively separation of CFA [16]. Molecular surfactants are preferentially adhered at the water-oil/air interface due to the non-polar ...
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Development of Flotation Device for Removing Unburnt …
The flotation method is a conventional technique that is mainly used for coal beneficiation, ore beneficiation, and the deinking of used paper [22,23]. Hydrophobic particles are attached to the surface of bubbles and floated in the water, allowing for hydrophilic particles to be collected from the bottom.
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Ultrasonic-assisted flotation of fine coal: A review
Coal flotation is a separation process performed mainly based on differences in surface hydrophobicity between coal and gangue. The flotation reagent can improve the hydrophobicity of coal, and also the adhesion between coal and air bubbles. Kerosene and light diesel oil are widely used as collectors in coal flotation.
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Mechanical Properties and Hydration Mechanism of Coal Flotation …
Large-scale application of filled coal mining technology has long been limited by conditions such as the cost of filling. Compared to traditional filling materials, coal flotation tailing filling materials (CFTFM) offers advantages such as low cost and excellent performance. The Box–Behnken response surface method was used to investigate the …
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Effects of particle size on the flotation behavior of …
In the process of coal slime flotation, due to mechanical coating and water entrainment, clay minerals have an adverse effect on the flotation of fine coal slime, resulting in low flotation recovery and poor …
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Investigation of collector mixtures on the flotation dynamics …
Here, Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), flotation experiments, and low-rank coal (LRC) particle-bubble attachment measurements (using the particle-bubble attachment index [PBAI]) were employed to explore the effects of collector mixtures on the flotation kinetics of LRC …
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