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Collecting behaviors of high internal phase (HIP) emulsion in flotation of ultrafine high-ash content coal slime Int. J. Coal Prep. Util. (IF 2.034) Pub Date : 2021-01-06 Xuemin Zhao; Yunmin Tang; Binglong Zhao; Changning Wu; Junguo Li; Changqing Chu; Ke Liu; Yulong Ding
ABSTRACT In order to tackle the problems of high oily collector consumption and low separation efficiency associated with ultrafine coal slimes, a new collector named high internal phase (HIP) emulsion was prepared. The flotation results showed that the HIP emulsion could significantly reduce the oil consumption by 90% compared with kerosene. The superior performance of HIP emulsion compared to kerosene
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Effect of slurry preconditioning on the occurrence of major minerals in the flotation products of coal Int. J. Coal Prep. Util. (IF 2.034) Pub Date : 2020-12-29 Danlong Li; Yannan Liang; Haian Wang; Lu Yang; Xiaokang Yan; Lijun Wang; Haijun Zhang
ABSTRACT Organic and inorganic matters are two main compositions of coal, and their occurrence forms in flotation products are closely associated with the ultimate flotation performance. Considering that pulp-mixing stage can strongly affect particle surface properties, this study tentatively investigated the effect of slurry preconditioning on the element distribution of major minerals in flotation
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Experimental Study on the Influence of Pyrite Oxidation Products on Coal Spontaneous Combustion Int. J. Coal Prep. Util. (IF 2.034) Pub Date : 2020-12-27 Bing Lu; Ling Qiao; Jiren Wang; Jing Zhang; Junling Ding
ABSTRACT In order to study the effect of pyrite oxidation products on the spontaneous combustion of coal, five kinds of compounds of pyrite oxidation products with 6% of a mass fraction were added to the coal sample of Yangmei No. 5 Mine. The analysis shows that the weightlessness and ignition activation energy of coal samples after adding Fe3+, Fe2+, and H+ are reduced compared with YM. Fe3+ and Fe2+
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Evaluation and optimization of preparation for semi-coke briquette with alkali-heat treated wheat straw binder Int. J. Coal Prep. Util. (IF 2.034) Pub Date : 2020-12-27 Maobo Yuan; Chang’An Wang; Lin Zhao; Zhengrong Zhu; Pengqian Wang; Chaowei Wang; Defu Che
ABSTRACT Semi-coke briquette used in stoves could reduce the primary PM2.5 emission and lower the material cost advantages. While the manufacturing cost of semi-coke briquette is relatively high due to the weak cohesiveness of semi-coke. The cost-effective and environment-friendly briquetting technology still needs to be developed for clean utilization of fine semi-coke. A novel preparation method
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Analysis of enhancing moisture-proof and waterproof performance for lignite powder briquette Int. J. Coal Prep. Util. (IF 2.034) Pub Date : 2020-12-22 Zhenkun Guo; Jianjun Wu; Yixin Zhang; Fanhui Guo; Zekai Miao; Xu Zhao; Yang Guo
ABSTRACT There are abundant resources of low-rank coal powder in the world. Powder briquetting technology has opened up a new avenue for large-scale utilization of low-rank coal. Water repellency is of great importance for the storage and transportation of lignite briquettes. In this paper, different water repellents were investigated to improve the moisture and water resistance of briquettes. The
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Application of screening using a flip-flow screen and shallow groove dense-medium separation in a steam coal preparation plant Int. J. Coal Prep. Util. (IF 2.034) Pub Date : 2020-12-21 Zengqiang Chen; Long Huang; Haishen Jiang; Yuemin Zhao; Chusheng Liu; Chenlong Duan; Bo Zhang; Guangrong Yang; Jin Chai; Haijun Ban; Shijie Yu; Jida Wu
ABSTRACT Low-rank steam coal is an important coal resource, but has high water and ash content, which needs to be separated to improve its quality and calorific value. In this paper, the process of screening using a flip-flow screen and density separator using a shallow groove dense-medium separator for steam coal was proposed and applied to the Lijiahao coal preparation plant. Kinematics of the screen
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Optimization of coal cake stability for stamp charging coke making operation at Tata Steel Int. J. Coal Prep. Util. (IF 2.034) Pub Date : 2020-12-15 Bidyut Das; Ajinkya Meshram; Anant Prakash; Lopamudra Panda; Vimal Kumar Chandaliya; Pratik Swarup Dash; Kunal Sen; Arvind Nath Rai; Ranjan Kumar Singh
ABSTRACT Revisit of the existing knowledge on coal cake stability was felt necessary when new batteries at Tata Steel were commissioned. As the proposed coals were different than the existing operation, stamping energy must be re-optimized for a low ash coal blend. In past studies, it was established that high mineral matter coals are easier to stamp as compared to low mineral matter contained coal
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Investigating potential co-firing of corn cobs with lignite for energy production. Thermal analysis and behavior of ashes Int. J. Coal Prep. Util. (IF 2.034) Pub Date : 2020-12-12 Despina Vamvuka; Gerasimos Panagopoulos; Stelios Sfakiotakis
ABSTRACT Thermal analysis technique was used to study the combustion characteristics of lignite, corn cob biomass, and their mixtures. Ignition, reactivity, peak and burnout temperatures, combustion time, and interactions between blend components were determined. Ashes were characterized by chemical, mineralogical, and fusibility analyses in order to assess their environmental impact, as well as slagging
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Pyrolysis and combustion behavior of few high-ash Indian coals Int. J. Coal Prep. Util. (IF 2.034) Pub Date : 2020-12-12 Gaurav Raghuvanshi; Prasenjeet Chakraborty; Bodhisatwa Hazra; Ashis K. Adak; Pradeep K. Singh; Ashok K. Singh; Vivek Singh
ABSTRACT In this study, three high-ash Indian sub-bituminous coals of different thermal maturities from three different open cast mines of Raniganj basin, eastern India, were studied to understand their combustion and pyrolysis behavior. The combustion analyses were performed under three different heating rates (5°C, 10°C, and 15°C/min). From the thermograms of TG-DTG pyrolysis curves, it was observed
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Particles motion simulation and application exploration of three-stage cone water-only cyclone Int. J. Coal Prep. Util. (IF 2.034) Pub Date : 2020-12-10 Chi Wang; L. B. Wei; G. W. Cui; J. F. Gao
ABSTRACT In this study, the particle motion simulation and application exploration of three-stage cone water-only cyclone (TWOC) were performed. The discrete phase model was applied to simulate the particles motion during the separation process of TWOC. The particle distribution curve of light products of TWOC obtained by the simulation is well consistent with that of the validation experiment, demonstrating
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The experimental research on the aerodynamic structure of the flow in the particle separation section of the ash capturing device Int. J. Coal Prep. Util. (IF 2.034) Pub Date : 2020-12-07 Arkadiy Shishkin; Andrey Shishkin; Natalya Dushkina
ABSTRACT The results of experimental research on a physical model of the impact of the new ash capturing device structural and operational parameters on the aerodynamic structure of the dispersed flow in the particle separation section are presented. The previous research based on the numerical modeling method defined the features of the aerodynamic structure of the flow in this section and the dust
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Investigation on the impact of physical properties of the coal-ash slurries on the erosion wear performance of WC coated steel by using Image processing technique Int. J. Coal Prep. Util. (IF 2.034) Pub Date : 2020-12-01 Gurmeet Singh; Satish Kumar; Satbir S. Sehgal; Harjot Singh Gill
ABSTRACT The various properties of carrier flow (e.g. coal, fly, and bottom-ash slurries) having a major impact in determining the equipment life of various slurry transportation components such as pipelines, pump impellers, bends, etc. Also, in literature, how the size and shape of different erodent affect the various erosion characteristics remain undiscovered. In this study, we propose the use of
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Flow field and particle motion characteristics of rotary triboelectric separator based on CFD simulation Int. J. Coal Prep. Util. (IF 2.034) Pub Date : 2020-11-25 Fangyuan Ma; Youjun Tao; Jia Liu; Yushuai Xian
ABSTRACT This paper studies particle motion and flow field characteristics with fly ash as an example and combine the experiments to analyze the separation process of rotary triboelectric separator in detail. Under boundary reference conditions of 22 kV plate voltage, 3 m/s feed flow, and 1815 r/min (189.95 rad/s) friction wheel speed, it simulated single-particle and particle group movement with different
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Prediction of coke AMS through data mining: a practical approach Int. J. Coal Prep. Util. (IF 2.034) Pub Date : 2020-11-19 Deepak Kumar; V. K. Saxena; H. P. Tiwari; B. T. Aleti; V. K. Tiwary
ABSTRACT The appropriate specification of size analysis of blast furnace coke remains debatable even today. But operators prefer consistent quality and the right size of coke for the smooth operation of the blast furnace. The arithmetic mean size (AMS) of coke and its distribution inside the blast furnace are essential for maintaining the efficient operation of the blast furnace. The coke AMS is significantly
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Parameter optimization of an industrial water injection hydrocyclone in the Taixi coal preparation plant Int. J. Coal Prep. Util. (IF 2.034) Pub Date : 2020-11-05 Dongyang Dou; Zhaoyu Qiu; Jianguo Yang
ABSTRACT An industrial water injection hydrocyclone was adopted in the Taixi coal preparation plant to overcome the shortcoming of fine particle entrainment in the underflow and improve the grading efficiency. Parameter optimization of the hydrocyclone was critical prior to putting it into production. A particle swarm optimization optimized support vector machine (PSO-SVM) model based on uniformly
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Effectiveness of carboxymethyl cellulose solutions for dust suppression in the mining industry Int. J. Coal Prep. Util. (IF 2.034) Pub Date : 2020-10-29 Gabriel Borowski; Yuri Smirnov; Andrey Ivanov; Aleksandr Danilov
ABSTRACT This research focused on the issue of reducing the coal dust emission from the coal mining industry. Out of various binders for dust suppression, the authors used sodium carboxymethylcellulose (SCMC) with the spraying technology. The PM10 coal dust was recognized as the most harmful fraction. A laboratory setup based on a sealed dust suppression bunker with 10 g dust samples was tested, placed
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Optimizing oxidized coal flotation using impact flow conditioning pulp Int. J. Coal Prep. Util. (IF 2.034) Pub Date : 2020-10-25 Hainan Wang; Danlong Li; Wenqing Yang; Lijun Wang; Haijun Zhang; Xiaokang Yan
ABSTRACT Numerous oxygen elements are present on the oxidized coal surfaces, resulting in the difficulties for flotation. In this study, the enhancement of oxidized coal flotation using the impact flow conditioning pulp was investigated, and the impact flow velocity was optimized. The enhancement mechanism of the impact flow conditioning pulp was investigated via a series of experiments. The results
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Effects of the operating parameters on the separation results of a three-stage cone water-only cyclone Int. J. Coal Prep. Util. (IF 2.034) Pub Date : 2020-10-25 Chi Wang; L. B. Wei; G. W. Cui
ABSTRACT In this study, a three-level Box-Behnken design of experiments coupled with response surface methodology was applied to investigate the effects of the operating parameters (solid content of the feed, feed pressure and insertion depth of the vortex finder) on the separation results (ash content and yield of the overflow) of a three-stage cone water-only cyclone. The results showed that the
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Distribution rate prediction of gravity separation based on the arctangent model Int. J. Coal Prep. Util. (IF 2.034) Pub Date : 2020-10-19 Peng Chen; Rui Zhou; Shiwei Wang; Chenlong Duan; Haishen Jiang; Chengyong Wang
ABSTRACT To accurately predict the product yield during coal preparation plant design, an arctangent model is proposed, and the derivation process of parameters in the model is described. To determine the adequacy and reliability of the model, a statistical analysis approach is used, and the accuracy of the model was verified using the prediction data of usual approximate formula method (AFM) and the
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Application of statistical analysis for optimizing of column flotation with pine oil for oil shale cleaning Int. J. Coal Prep. Util. (IF 2.034) Pub Date : 2020-10-08 Ahmed Sobhy; Ahmed Yehia; F.I. El Hosiny; S.S. Ibrahim; Rasha Amin
ABSTRACT Oil shale must have a large quantity of kerogen to be of economic benefit, but oil shale with about 30% kerogen is a low-quality ore. Thus, the column flotation technique has been utilized to increase its quality, and the results were analyzed by a reduced two-level factorial design to optimize the interaction effects of seven parameters by response surface modeling. The perturbation plots
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Generalized skew-normal distribution model of partition curves based on quartile Int. J. Coal Prep. Util. (IF 2.034) Pub Date : 2020-10-06 Minqiang Fan; Canjin Luo
ABSTRACT In view of the similarity between the partition curve of coal preparation and the cumulative curve of distribution function, the quartile of random distribution is often used to describe the characteristics of partition curve, the median being the separation density, quartile deviation being the probable error, quartile measure of skewness reflecting the asymmetry of the partition curve. With
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Compaction characteristics of binary coal mixtures during binder less briquetting process Int. J. Coal Prep. Util. (IF 2.034) Pub Date : 2020-10-05 Fajar F. Pambudi; Toto Hardianto; Adrian R. Irhamna
ABSTRACT Dried coal typically had certain Particle Size Distribution (PSD) resulting from the size reduction process. Effect of PSD to the compaction phenomenon was investigated on the binary mixtures of Indonesian middle-rank coal with different mass fraction of small and large particles (%L). Compacted density of each coal mixtures was measured during uniaxial briquetting process and their compaction
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Emulsification of kerosene and its effect on the separation of unburned carbon from fly ash Int. J. Coal Prep. Util. (IF 2.034) Pub Date : 2020-10-04 Darui Liu; Guimei Gao; Yunfeng Zhang; Min Jia; Xiaoguang Chao; Litao Song; Hongquan Wang
ABSTRACT This type of fly ash is difficult to float even at a higher concentration of collector due to less dispersion of the collector molecules on the surface. Emulsification of kerosene in the presence of Sodium Dodecyl Sulfate (SDS) dramatically reduces the size of the kerosene droplets. The results showed that much less collector was required to achieve a good separation of carbon from fly ash
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Desulfurization and de-ashing of low-rank coal by catalytic oxidation using Sn as catalyst loaded in different forms Int. J. Coal Prep. Util. (IF 2.034) Pub Date : 2020-10-04 Waqas Ahmad; Ishraq Ahmad; Imtiaz Ahmad; Muhammad Yaseen; Nisar Muhammad; Muhammad Salman
ABSTRACT The desulfurization and de-ashing of Darra Adam Khel Coal (Pakistan) was studied by oxidation using Hydrogen peroxide (H2O2) and formic acid (HCOOH) oxidation system. The maximum de-ashing and desulfurization of about 63 and 48% was achieved through oxidation at 70°C in 90 min with H2O2 and HCOOH volume of 2 mL each. Catalytic oxidation was studied in the presence of Tin (Sn) as catalyst loaded
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Study on matching effect of operating variables and particle motion behavior in Teeter Bed Separator Int. J. Coal Prep. Util. (IF 2.034) Pub Date : 2020-09-29 Junli Liu; Lubin Wei; Xueshuai Zhu; Shihang Wang
ABSTRACT Water velocity and bed density are most important operating variables affecting the separation of coal particles in Teeter Bed Separator (TBS). In this paper, experimental investigation is carried out to evaluate the matching effect of operating variables on the performance of TBS for separating a coal sample with size of 1–0.25 mm. Furthermore, the particle motion based on the Euler-Euler
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Recognition of process conditions of a coal column flotation circuit using computer vision and machine learning Int. J. Coal Prep. Util. (IF 2.034) Pub Date : 2020-09-24 M. Massinaei; A. Jahedsaravani; H. Mohseni
It is a well-established fact that the flotation performance is reflected in the structure of the froth surface. A machine vision is able to extract the froth features and present them to the plant operators or the process control system. In this communication, computer vision and machine learning techniques are integrated for recognition of process conditions of a coal column flotation circuit. An
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Taguchi based Grey relational analysis for optimization of design parameters of a 100 mm water-only cyclone Int. J. Coal Prep. Util. (IF 2.034) Pub Date : 2020-09-24 Bhabani Supriya Maharana; Nikkam Suresh
Performance of the 100 mm water-only cyclone and its design parameters in cleaning minus 3.0 mm Indian coal was successfully evaluated via Taguchi based Grey-Relational-Analysis (GRA) using L16 (Single-level) orthogonal array experimental layout. The Taguchi method integrated with GRA was used as a performance index in analyzing multiple responses i.e., clean coal yield (%yield), ash content (%ash)
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Comparative investigation of bio-beneficiation of Kasnau-Matasukh lignite using native microorganisms Int. J. Coal Prep. Util. (IF 2.034) Pub Date : 2020-09-22 Aniruddha Kumar; Pramod K Rajak; Asha Lata Singh; Rajesh Kumar; K N Singh; Prakash K Singh
In the present investigation, an attempt has been made to beneficiate lignite using Burkholderia sp. GR 8–02, Bacillus sp. XQW, and mixed consortium. The experiments showed that Bacillus sp. XQW could remove 18.18–37.50% of total sulfur followed by mixed consortium (18.18–29.17%) and Burkholdria sp. GR 8–02 (9.09%-29.17%). There was also a concomitant decrease in the content of mineral matter as revealed
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A comparative study on methane adsorption onto various adsorbents including activated carbons, zeolites, MWCNT, and MCM-41 Int. J. Coal Prep. Util. (IF 2.034) Pub Date : 2020-09-16 Fatma Oguz Erdogan
In this study, it was aimed to produce low-cost activated carbons from cornelian cherry stones (CCS) by ultrasound-assisted chemical activation with the use of LiOH, KOH, NaOH, and ZnCl2. In the study, adsorption capacities of the activated carbon samples for CH4 compared with that of commercially obtained activated carbon (AC), multi-walled carbon nanotubes (MWCNT), mesoporous silica (MCM-41), and
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The application of combined lignite cleaning processes, bacterial leaching and flotation, for reducing higher ash and sulfur contents Int. J. Coal Prep. Util. (IF 2.034) Pub Date : 2020-09-14 Volkan Arslan
In this study, biological and physicochemical processes were combined to decrease the ash and sulfur contents of finely ground coal. Firstly, biodesulphurization experiments of lignites with high ash and sulfur contents were carried out with air-supply fiberglass bioreactor using Acidithiobacillus ferrooxidans. At the end of the 12-hour bacterial desulfurization experiments; ash content, sulfur content
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A novel dryer design with carbonic heating film technology and drying of high moisture lignite coal Int. J. Coal Prep. Util. (IF 2.034) Pub Date : 2020-08-31 Hasan Hacifazlioglu; Buse Bolat
Rotary dryers are generally preferred for industrial coal drying operations. However, the initial investment and maintenance costs of rotary dryers are quite high. There is also the risk of spontaneous combustion and ignition of coal in such dryers. In this context, carbonic film technology comes to the forefront when an environmentally friendly drying system with low initial investment cost and no
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Preparation and characterization of Linde-type A zeolite (LTA) from coal fly ash by microwave-assisted synthesis method: its application as adsorbent for removal of anionic dyes Int. J. Coal Prep. Util. (IF 2.034) Pub Date : 2020-08-23 Tahani Al-dahri; Adnan A. AbdulRazak; Sohrab Rohani
Linde-type A zeolite (LTA) was prepared from coal fly ash (CFA) and used as an adsorbent to remove acidic dye (Acid red 66, AR66) from its aqueous solution. The effectiveness of synthesized (LTA) in adsorbing (AR66) from an aqueous solution was studied using batch experiments. The equilibrium data were studied using the Langmuir and Freundlich models and it was found that the data fit better to Freundlich
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Exploratory investigation on the use of low-cost alternative media for ultrafine grinding of coal Int. J. Coal Prep. Util. (IF 2.034) Pub Date : 2020-08-20 Qingqing Huang; Aaron Noble; Deniz Talan
In this study, the energy efficiency of three alternative grinding media including, coarse silica beads, fine silica beads, and granular sand, were evaluated and compared against standard stainless steel. Stirred mill test results show that both silica beads and granular sand were more efficient than stainless steel in producing ultrafine particles following the order of coarse silica beads>granular
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Characterization and numerical simulation on preparation of super-low ash clean coal by two-stage cyclones Int. J. Coal Prep. Util. (IF 2.034) Pub Date : 2020-08-20 Hui Wang; Peikun Liu; Xinghua Yang; Yuekan Zhang; Xiaoyu Li; Lanyue Jiang
This study used two-stage cyclones combined with a full cylinder and a short cone cyclone to recover super-low ash clean coal from the coal slime to solve problems of coal slime such as large production, difficult recovery, and low value-added used. After two-stage cyclones separation and screening, super-low ash clean coal with an ash content of 2.74% was obtained, and the mass yield was 10.56% via
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An investigation of performance characteristics and energetic efficiency of vertical roller coal mill Int. J. Coal Prep. Util. (IF 2.034) Pub Date : 2020-08-12 Mehmet Tontu
This study shows the performance of a currently running vertical roller coal mill (VRM) in an existing coal-fired power plant. In a power plant, the coal mill is the critical equipment, whose effectiveness impacts the overall power plant efficiency. Uniform coal feeding mass flow rate and required particle size and temperature at the outlet channel throughout with better classifier performance are
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Dry beneficiation of coal on KAT air table Int. J. Coal Prep. Util. (IF 2.034) Pub Date : 2020-07-23 Davaasuren Jambal; Byoung-Gon Kim; Ho-Seok Jeon
Dry gravity-based separation processes such as pneumatic jigs and tables generally use density stratification of feed material with light and dense particles to achieve separation. Therefore, it is necessary to enhance the stratification of the particles in the separation bed. The main purpose of this work was to evaluate the use of an intrinsic autogenous separation medium of feed coal for the dry
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Challenges of using froth features to predict clean coal ash content in coal flotation Int. J. Coal Prep. Util. (IF 2.034) Pub Date : 2020-07-12 Jiakun Tan; Long Liang; Yaoli Peng; Guangyuan Xie
In coal flotation, clean coal ash content is controlled by adjusting different operating parameters to meet the requirements for products. However, real-time control is strictly restricted by the traditional ash detection method, which is very time-consuming. Froth phase plays an important role in both transporting and upgrading flotation concentrate. The correlation between clean coal ash content
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The use of release analysis to show the selectivity of reagents towards differently sized feeds of the same coal Int. J. Coal Prep. Util. (IF 2.034) Pub Date : 2020-07-12 Laxmikanta Sahu; Sumantra Bhattacharya; Shobhana Dey
Release analysis is used to characterize the cleaning ability of coal fines. It defines the limit of separation at any target level of ash. Since flotation depends upon many factors like feed size and its composition, surface properties, and type of reagents, it is important to characterize the optimum boundary of separation. Release analysis following the BS7503 procedure was used to characterize
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Turpentine oil: a novel and natural bridging liquid for agglomeration of coal fines of high ash coals Int. J. Coal Prep. Util. (IF 2.034) Pub Date : 2020-07-12 Saswati Chakladar; Riya Banerjee; Ashok Mohanty; Sanchita Chakravarty; Prasanjeet Kumar Patar
Oil agglomeration is an effective way to demineralize high ash coals as compared to froth flotation and density gradient separation. In this process, the choice of bridging liquid is critical with respect to economics and efficiency. Herein, we report turpentine oil as a potential bridging liquid which is demonstrably efficient in coal demineralization at lower concentration (10 vol.%) compared to
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A sustainable and green process based on froth flotation for effective recovery of combustibles from coking coal fines Int. J. Coal Prep. Util. (IF 2.034) Pub Date : 2020-07-12 Junyu Wang; Hangil Park; Chun Yong Ng; Liguang Wang
This paper reports experimental results for the flotation of a coking coal sample in highly saline water free of any organic chemicals using an oscillatory air supply. The results are compared with those obtained using a conventional steady air supply. The experiments were conducted with 0.5 M NaCl solution using a laboratory-scale flotation column equipped with a 50 µm pore-sized sparger. The oscillatory
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Recovery of rare-earth elements from coal fly ash via enhanced leaching Int. J. Coal Prep. Util. (IF 2.034) Pub Date : 2020-07-10 Zhiping Wen; Changchun Zhou; Jinhe Pan; Shanshan Cao; Tingting Hu; Wanshun Ji; Tiancheng Nie
Coal fly ash is regarded as a potential alternative source of rare-earth elements and has gained much attention over the past few years. However, the majority of rare-earth elements in coal fly ash are entrapped in the glassy phase, which makes the recovery of rare-earth elements from coal fly ash extremely challenging. In this paper, two pre-treatments (mechanical grinding and alkali solution treatment)
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Discrimination analysis of coal and gangue using multifractal properties of optical texture Int. J. Coal Prep. Util. (IF 2.034) Pub Date : 2020-07-07 Chengcai Fu; Fengli Lu; Guoying Zhang
The separation of coal and gangue is an important part in the coal-preparation process, which can be realized by image recognition technique. The unique optical texture of coal is the most obvious visual features to distinguish coal and gangue. The current research represented the attempt to implement the multifractal analysis in the optical texture of coal and gangue. Firstly, fractal theory is applied
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A mini-review on coal fly ash properties, utilization and synthesis of zeolites Int. J. Coal Prep. Util. (IF 2.034) Pub Date : 2020-07-07 Zhandos Tauanov; Seitkhan Azat; Aknur Baibatyrova
Coal fly ash is considered as a by-product of coal combustion power stations that may pertain unique properties and utilization fields. This review article gives an overview of different classification methods with comparative data on the chemical composition of coal and coal fly ash. Furthermore, a review describes in detail the utilization sectors of coal fly ash that expands from environmental application
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Coal higher heating value prediction using constituents of proximate analysis: Gaussian process regression model Int. J. Coal Prep. Util. (IF 2.034) Pub Date : 2020-07-05 Ali Volkan Akkaya
This study aims to develop a globally valid prediction model for coal higher heating value (HHV). For the first time, the Gaussian process regression (GPR) method is performed to build the prediction model. For this purpose, a large dataset (as received basis) composed of a wide range of coal ranks is gathered from different geographic locations throughout the world countries in the related literature
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Mathematical representation of the performance of DM cyclone and Vorsyl separator for coal cleaning Int. J. Coal Prep. Util. (IF 2.034) Pub Date : 2020-06-30 Dejalin Sahu; Nikkam Suresh; Hari Vuthaluru
The performance of a coal cleaning gravity separator is represented by plotting the partition curve, which is otherwise known as the Tromp curve. From this curve, the two performance parameters estimated are the specifics gravity of separation (SG50) and the sharpness of separation (EP). For a given washing unit, when a family of such curves is plotted against a normalized specific gravity (SG/SG50)
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Effect of particle size distribution on filter cake pore structure and coal slurry dewatering process Int. J. Coal Prep. Util. (IF 2.034) Pub Date : 2020-06-22 Qiming Zhuo; Wenli Liu; Hongxiang Xu; Donghui Wang
The ease or difficulty of implementing the dewatering process is determined by the state of filter cake pores. These pores are the channels vacated by the filtrate and represent the storage space for water. In this study, the effects of particle size distribution on the filter cake pore structure and the coal slurry dewatering process were studied through visual and quantitative methods. Experimental
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Application of metaheuristic based artificial neural network and multilinear regression for the prediction of higher heating values of fuels Int. J. Coal Prep. Util. (IF 2.034) Pub Date : 2020-06-14 Adeyemi Emman Aladejare; Moshood Onifade; Abiodun Ismail Lawal
This paper describes the development of metaheuristic based artificial neural network (i.e., ANN optimized with PSO, ANN-PSO) and multilinear regression models to predict the higher heating values (HHV) of solid fuels based on the parameters of proximate and ultimate analyzes of the solid fuels. Three hundred data points of HHVs, proximate and ultimate analyzes obtained from published papers on solid
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Explicit equation derivation for predicting coal moisture content in convective drying process by GMDH-type neural network Int. J. Coal Prep. Util. (IF 2.034) Pub Date : 2020-06-05 Saban Pusat; Ali Volkan Akkaya
Predicting the instant moisture content of the low-rank coals under the different drying conditions is crucial to construct the optimal system design and operation related to drying processes. Even if the thin-layer drying models are at the center of the field studies, the disadvantage of these type models is that the prediction results are valid only for the conditions of the drying experiment. Conversely
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Improved surface morphology by reforming of oxygen functional groups of Indian coal upon irradiating with microwave radiations Int. J. Coal Prep. Util. (IF 2.034) Pub Date : 2020-05-26 Harmanpreet Singh; Satish Kumar; Saroj Kumar Mohapatra
The high-rank coal reserves are limited and getting depleted at an escalating rate to meet the demands of growing population. This concern has compelled the scientific community to use the young high ash coals. The coal water slurry fuel is one promising way to use low-quality coal as an economical liquid fuel. Due to poor physico-chemical and surface properties of such coals, these systems appear
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Experimentation and statistical prediction of screening performance of coal with different moisture content in the vibrating screen Int. J. Coal Prep. Util. (IF 2.034) Pub Date : 2020-05-24 Bharath Kumar Shanmugam; Harsha Vardhan; M. Govinda Raj; Marutiram Kaza; Rameshwar Sah; Harish Hanumanthappa
Screening of coal is one of the processes carried out to produce clean coal suitable for the blast furnace. In this work, the screening of moist coal was carried out for different angles of the screen and frequencies. A 2 mm screen perforation was used to separate undersize coal of size +1 mm-2 mm from the +1 mm-3 mm coal samples. For each experimental condition, the screening efficiency was calculated
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Effect of electrochemical oxidation of pyrite on coal spontaneous combustion Int. J. Coal Prep. Util. (IF 2.034) Pub Date : 2020-05-21 Bing Lu; Jiren Wang; Ling Qiao; Jinquan Chen
In order to study the effect of electrochemical oxidation of pyrite in high-sulfur coal on coal spontaneous combustion, the electrochemical oxidation reaction of pyrite in coal was promoted by electrolysis experiments. The FTIR test results show that the content of active groups -OH and -CH2 increases after electrolysis of high sulfur coal. According to the ignition activation energy theory, which
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Kinematics and mechanism of rigid-flex elastic screening for moist coal under disequilibrium excitation Int. J. Coal Prep. Util. (IF 2.034) Pub Date : 2020-05-18 Haishen Jiang; Shijie Yu; Long Huang; Yuemin Zhao; Chenlong Duan; Quanqiang Wang; Zhenfu Luo; Chusheng Liu; Zhiguo Zhou; Jingfeng He; Ligang Tang; Xiaoqiang Cao
Elastic screening methods are widely used in the classification of moist coal as they can overcome the problem of aperture blockage. However, the use of an equally inclined screen surface with balanced excitation facilitates material accumulation, worsening the screening performance. Here, a disequilibrium excitation structure was proposed to solve the accumulation problem, and its synchronization
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Beneficiation of small South African coal using an air dense medium fluidized bed Int. J. Coal Prep. Util. (IF 2.034) Pub Date : 2020-05-13 ES (Peters) Diedericks; M Le Roux; QP Campbell; N Hughes
This paper investigates the air dense medium fluidized bed (ADMFB) as a suitable dry beneficiation technique to upgrade +5.6 mm-13.2 mm South African coal. The separation efficiency of the ADMFB was assessed by determining the effect, if any, of particle size range, medium to coal feed ratios, and the addition of vibration on the separation ability of the bed. The coal was upgraded to varying degrees
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Image positioning and identification method and system for coal and gangue sorting robot Int. J. Coal Prep. Util. (IF 2.034) Pub Date : 2020-05-13 Man Li; Yong Duan; Xianli He; Maolin Yang
Accurately positioning and identifying coal and gangue under the heterogeneous and complex scenarios of coal production is a key and difficult problem for coal and gangue sorting robot. This paper proposes an image processing based method for the problem and further develops a positioning and identification system. The coal and gangue samples are selected from Hancheng Coal Mine, China’s Shaanxi province
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Variations in combustion properties of coal with average relative density and functional groups identified by FTIR analysis Int. J. Coal Prep. Util. (IF 2.034) Pub Date : 2020-05-07 Dibyajyoti Behera; Barun Kumar Nandi; Sumantra Bhattacharya
This work presents experimental results of combustion characteristics of low volatile Indian coal. Coal of different average relative density (ARD) varying from 1.35 to 2.0 was generated by density fractionation of the coal. Coal samples were characterized by proximate analysis, Fourier-transform infrared spectroscopy (FTIR), ultimate analysis, and gross calorific value (GCV). Combustion experiments
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Dry processing of high ash Indian coal by air fluidized vibrating deck Int. J. Coal Prep. Util. (IF 2.034) Pub Date : 2020-05-07 Shobhana Dey; Binish Chaurasia; Laxmikanta Sahu
Processing of noncoking coals in India is limited due to the high cost involved in wet processing. In the present study, dry beneficiation of two high ash Indian non coking coal samples from two different coalfields, namely, Talcher (coal-A) and Ib Valley (coal-B) having diverse characteristics are studied using an air fluidized vibrating deck separator. Washing characteristics of two coal samples
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Exploring a promising technology for the extraction of gallium from coal fly ash Int. J. Coal Prep. Util. (IF 2.034) Pub Date : 2020-04-24 Jing Huang; Yingbin Wang; Guanxuan Zhou; Yu Gu
The coal fly ash (CFA) in the present study contains a high content of gallium, which is categorized as a strategic metal. Gallium extraction from CFA is an important step toward its reutilization. Two different processes for gallium extraction were systematically investigated and compared. The effects of mixed acid, microwave power, microwave digestion time, the amount of HNO3, HF, and HCl were studied
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Design and Experimental Study of a Modified Cyclonic Microbubble Flotation Column System Int. J. Coal Prep. Util. (IF 2.034) Pub Date : 2017-12-11 Yanfeng Li; Hao Pan; Ningbo Li; Wenlong Jiang; Yi Li; Wenjun Zhang; Zhengbiao Peng
The cyclonic–static microbubble flotation column (FCSMC) has been proven to be a promising technique for recovering fine-grained minerals. However, low recovery of coarse coal particles by the FCSMC has been reported due to utilization of a single mineralization step. In the present study, a novel modified flotation unit has been added to the conventional FCSMC to improve the recovery of coarse coal
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An investigation of the effect of clay type on coal flotation along with DLVO theoretical analyses Int. J. Coal Prep. Util. (IF 2.034) Pub Date : 2019-04-19 Can Gungoren; Onur Guven; Mustafa Cinar; Orhan Ozdemir
Coals generally exist with clay minerals, which are very fine-sized minerals, and adversely affect the flotation of coal. For instance, they make the coal surface hydrophilic by coating coal surfaces and therefore, they inhibit bubble-particle attachment. Clay minerals can also cause over-consumption of reagents due to their high surface area. Additionally, clay minerals can transfer into the concentrate
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Development of a petrographic technique to assess the spontaneous combustion susceptibility of Indian coals Int. J. Coal Prep. Util. (IF 2.034) Pub Date : 2017-11-01 Niroj Kumar Mohalik; Edward Lester; Ian Stuarts Lowndes
Petrographic studies are commonly used to categorize the potential utilization of coals. Eleven coal samples from the Jharia coalfield (JCF), India, were studied using petrographic techniques to investigate maceral content, reflectance, and textural characteristics. Multiple test samples of each coal were slowly oxidized under controlled laboratory conditions from an ambient temperature of 30°c to