— Micro-flotation, a specific gravity separation technique, was successfully used to remove coal contaminants from radiocarbon samples obtained from profiles, unit excavations, and solid sediment cores in Chaco Canyon, New Mexico, USA.Coal from the Cretaceous Menefee Formation occurs throughout Chaco Canyon in aeolian, alluvial, …
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Flotation is commonly used to treat fine coal (typically below 500 microns in size) and is a complex, three-phase process that is controlled by factors which can be divided into …
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The clean and efficient utilization of coal is a promising way to achieve carbon neutrality. Coking coal is a scarce resource and an important raw material in the steel industry. …
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— Flotation tests for fine, medium, and coarse particles and the artificial ternary-particle mixtures were executed in a lab flotation cell. Flotation results were evaluated by the modified flotation rate constant (K m) according to the classical first-order flotation model. A parameter called interaction degree was developed to estimate the ...
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— This phenomenon is shown clearly in flotation response of the minus 200-mesh Pittsburgh No. 8 and Upper Freeport PA coals. Summary and Conclusions. Flotation kinetic behavior of coal can be described by a first-order flotation kinetic model with a sine function (in the range of 0 to π/2) distribution of flotabilities in the flotable particles.
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no flotation can occur. Contact between particles and bubbles can be accomplished in a flotation cell such as the one shown schematically in Figure 5. Figure 5: Simplified schematic of a conventional flotation cell. The rotor draws slurry through the stator and expels it to the sides, creating a suction that draws air down the shaft of the stator.
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new high-efficiency flotation technology called the StackCell®. This breakthrough technology, derived from a fundamental understanding of flotation first principles, offers …
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— 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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— The present review paper summarizes the up-to-date research advancements made in the use of mixed reagent systems to improve the separation efficiency of coal …
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— FTIR of flotation coal. 2.2. Reagent. The types and molecular structures of the reagent used in the experiment are shown in Table 3 and Table 4. The main components of diesel are alkanes, a small number of esters and arenes. For this reason two direct-linked alkanes with different carbon chain lengths and mainly C9 arenes were …
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— The flotation test proved that GK collector has excellent flotation performance for low-rank coal (combustible recovery rate close to 90 % while the ash content of clean coal is about 6 %). The contact angle, infiltration time, wetting heat and XPS analysis demonstrated that GK collector can significantly improve the hydrophobicity of low-rank ...
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— The advantages of froth flotation in coal processing are its relatively low capital and space requirements, as well as the relatively high recovery achievable under a wide range of operating conditions. Particles are carried into the froth by bubbles rising through the pulp phase. These bubbles, with their load of particles, accumulate at the ...
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— Coal flotation system is quite complex since it involves multiple phases; coal particle, oil droplet and air bubbles, along with promoters and dissolved inorganic ions in water. A good understanding of these phases and the mechanism of the interactions among them is crucial for controlling coal flotation. This paper gives a qualitative account ...
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— The comprehensive quality enhancement and grading of coal are crucial methods for unlocking the high value-added and low-carbon utilization of coal resources. In this work, the influence of oily bubbles on the flotation of Shendong Jurassic vitrinite-rich coal and inertinite-rich coal was studied via flotation tests, Fourier transform infrared (FT …
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— The influence of the natural salt solution on the flotation of coal was studied in [5–7]. The flotation of Karaganda coal fines yields 73.5% of concentrate with an ash content of 11.6% in the following conditions: furnace fuel consumption 1.5 kg/t; consumption of KOBS frothing agent 0.005 kg/m 3; and tap water with total mineralization 490 mg ...
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— The flotation kinetics of coarse coal particles was studied in a modified version of the Hallimond tube at 25 °C using nitrogen as the carrier gas, in the pH range 2–12. The kinetics was...
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— In this paper, a detailed description of the various phases in coal flotation, their physical and chemical interactions with each other in the flotation pulp, the major …
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The clean and efficient utilization of coal is a promising way to achieve carbon neutrality. Coking coal is a scarce resource and an important raw material in the steel industry. However, the presence of pyrite sulfur affects its clean utilization. Nonetheless, this pyrite could be removed using depressants during flotation. Commonly used organic …
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— The coal flotation selectivity indexes with nanobubbles are 12%, 15%, 23%, and 16% higher than without nanobubble at the product ash contents of 5%, 7.5%, 11%, and 15%, respectively. Less flota- tion selectivity improvement is observed when the product ash is low or high. This further proves that the use of nanobubbles can …
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Coal flotation is characterized by the chemical and petro-graphical composition of coal and its rank. In addition, size and sp . gr. of coal particles, pulp density, rate and uniformity of feed, conditioning, type of reagents, pH, presence of clay and type of flotation machines are the other variables which influence the coal flotation.
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— The proportion of minerals in the coal gasification fine slag samples was obtained using X-ray diffraction (XRD) and the "k-value method." As shown in Fig. 1, the coal gasification fine slag mainly contains quartz, calcite, potassium feldspar, and plagioclase.There is a bulge peak in the range of 20–30°, indicating that the fine …
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— This study investigates the flotation performance of a representative hard coal slime sample (d80 particle size of minus 0.2 mm) obtained from the Prosper-Haniel coal preparation plant located in Bottrop, Germany. Flotation was carried out with a newly designed flotation cell refurbished from an old ultrasonic cleaning bath (2.5 L volume) …
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— Both flotation recovery and matching degree generally increased as the impeller stirring speed increased, and the flotation recovery began to decrease at the impeller stirring speed of 1400 r/min for 0.25–0.045 mm coal slimes and at 1600 r/min for −0.045 mm coal slimes. Both the flotation recovery and matching degree followed the …
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— Interaction of applying stable micro-nano bubbles and ultrasonic irradiation in coal flotation. Hossein Ebrahimi Faculty of mining, petroleum and geophysics engineering, Shahrood University of Technology, Shahrood, Iran (The Islamic Republic Of),
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— Micro-flotation, a specific gravity separation technique, was successfully used to remove coal contaminants from radiocarbon samples obtained from profiles, unit excavations, and solid sediment ...
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— In addition, the flotation of flocculated coal fines was tested on the fine Prince coal for the deep elimination of ash and pyrite from coals in this work. An ultraclean coal with 1.3% ash remaining was produced with 87% combustible recovery. The ash rejection and pyritic sulfur rejection were about 93% and 66%, respectively.
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— here, γ is the yield of clean coal (%), M c is the weight of clean coal (g), and M t is the weight of the tailings (g). 2.2.2 Flotation Experiments in Inorganic Salt Solutions. Before studying the effect of monovalent cations on LRC flotation, the optimal collector dosage was determined from the flotation results obtained in deionized water (see …
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The theory of coal flotation is complex, which has been described in detail by Laskowski (2001). That is a first monograph on the coal flotation and fine coal utilization. It is affected by a very large number of variables. For a better understanding of the coal flotation process, the knowledge of the chemical composition,
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— Furthermore, the flotation yield of coal concentrate initially increased and then decreased with the increase of dodecane mass fraction. The ideal nonpolar and polar ratios ranged from 6: 4 to 8: 2. We analyzed the mechanism for boosting the floatability of low-rank coals using the combined collector through adhesion angle, contact angle, and …
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— In addition, they also found that flotation rate of coal using ultrasonic conditioning was on an average 10% faster than conventional conditioning. Coal flotation with ultrasound pretreatment could be defined with the fully mixed and second-order models. Download: Download high-res image (757KB) Download: Download full-size …
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— The efficient flotation separation of low-rank coal is still a difficult problem. The development of a collector is the key to solve the problem. In this study, a kind of mixed collector scheme with a practical …
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— Conventional hydrocarbon oil cannot adhere effectively to oxidized coal, resulting in a low yield of clean coal. In this study, a high-speed homogenizer was used to emulsify LDD (laurylamine dipropylene diamine) and kerosene, which enhanced the flotation efficiency of oxidized coal. The flotation results showed an increase from 4.12% …
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DOI: 10.1016/j.mineng.2020.106224 Corpus ID: 214252891; Flotation of coarse coal particles in the Reflux™ Flotation Cell @article{Sutherland2020FlotationOC, title={Flotation of coarse coal particles in the Reflux{texttrademark} Flotation Cell}, author={J. L. Sutherland and Jesse E. Dickinson and Kevin P. Galvin}, journal={Minerals …
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— Coarse coal flotation could simplify processing plant design. For example, the underflow of a 2 mm classifying screen on a typical coal processing plant will generally be split by a classifying cyclone into two separate streams (Luttrell et al., 2003). The coarser particles would be sent for gravity separation, with the finer particles ...
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