The Experts below are selected from a list of 321 Experts worldwide ranked by ideXlab platform
Xuliang Yang - One of the best experts on this subject based on the ideXlab platform.
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Kinematic properties and beneficiation performance of Fine Coal in a continuous vibrated gas-fluidized bed separator
Fuel, 2015Co-Authors: Xuliang Yang, Enhui Zhou, Zhijie Fu, Yuemin Zhao, Liang Dong, Haishen JiangAbstract:Abstract Dry beneficiation of Fine Coal is increasingly significant for the clean utilization of Coal resources in drought regions. In this paper, a continuous vibrated gas-fluidized bed separator was developed for Fine Coal dry beneficiation. The fluidization behavior and the kinematic properties of Fine Coal particles in this separator were systematically investigated. The results show that the bed expansion increases linearly with the superficial air velocity and theoretically, higher bed expansion benefits the hindered settling process of Fine Coal particles. However, larger superficial air velocity will induce intense fluctuation in bed surface. The conveying velocity of particles is mainly determined by the vibration angle and a predicted model is established by the nonlinear regression analysis. The kinematic properties underlying the particles diffusion in the separator are theoretically analyzed and a theoretical model of bed height distribution is established and this model fits the measured value well. The beneficiation performance of this separator is also evaluated by separating −3 + 1 mm Fine Coal. The results show that the probable error, E , is 0.225, indicating a continuous vibrated gas-fluidized bed separator can achieve a satisfactory performance.
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Process analysis of Fine Coal preparation using a vibrated gas-fluidized bed
Powder Technology, 2015Co-Authors: Xuliang Yang, Enhui Zhou, Zhijie Fu, Jie Zhao, Yuemin ZhaoAbstract:Abstract Fine Coal dry preparation becomes more and more significant for countries and regions which have insufficient processing water. Fine Coal separation based on density segregation in a vibrated gas-fluidized bed (VGFB) does not use water and dense medium and has a good separation performance. This paper attempted to carry out a systematic process analysis of Fine Coal preparation in a VGFB. Particles distribution characteristics were experimentally studied and it was pointed out that a VGFB of Fine Coal having a periodic slugging behavior could obtain a good performance of density segregation. Furthermore, the effects of several operational factors on the stratification performance were studied using Box–Behnken response surface methodology (RSM) and the RSM analysis indicated that several factors including superficial air velocity, vibration intensity and bed height all had significant effects. Among these factors, the superficial air velocity behaved considerably more significant than others. Under the optimal operational conditions determined by the RSM analysis, the results of − 6 + 3 mm Fine Coal preparation in a VGFB showed that the yield and ash content are 76.68% and 25.15% as to the clean Coal product, and 23.32% and 60.08% as to the gangue product, respectively. The probable error E value is 0.18, indicating a good performance of Fine Coal dry preparation in a VGFB.
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Fine Coal dry cleaning using an air dense medium fluidized bed with improved magnetite medium
Procedia Engineering, 2015Co-Authors: Yuemin Zhao, Zhenfu Luo, Zhijie Fu, Shulei Song, Chenglong Duan, Xuliang Yang, Luhui CaiAbstract:Coal beneficiation using air dense medium fluidized bed offers a number of advantages and provides an efficient solution for Coal cleaning in a dry way. Recently, the development of the air dense medium fluidized bed mainly concentrate on the coarse Coal (+6 mm), and it is also reported that Fine Coal (-6 mm) is hard to be separated by conventional magnetite medium. The objective of this study is to using four types of magnetite powders with different narrow size range to separate -6+3 mm Fine Coal. The pressure-drop performance of the different magnetite medium in fluidized bed was also experimentally studied. The results show that the Finer magnetite powders have a lower pressure-drop and minimum fluidization velocity than the coarse magnetite powders, and the -6+3 mm Fine Coal can be separated effectively by -0.15+0.074 mm magnetite powders, which will expand the lower separation limit of the air dense medium fluidized bed.
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high ash Fine Coal dry cleaning and stability of shallow bed dense phase gas solid separation fluidized bed
Energy & Fuels, 2014Co-Authors: Bo Zhang, Shulei Song, Yuemin Zhao, Liang Dong, Jianqing Wang, Liping Peng, Xuliang YangAbstract:Fine Coal dry separation technology has been one of the international research hotspots in the field of Coal preparation. This article proposes the shallow bed dense-phase gas–solid fluidized bed separation technology to remove gangue from the high ash Fine Coal. According to the criterion of center pressure drop, the CP value can be finally reduced by reducing the bed height, H, to decrease the bed pressure drop, ΔPB, under the condition of a fixed gas distributor pressure drop, ΔPD. A fluidized bed of uniform and stable density was formed. The medium of 33% Fine particles showed a better performance in −6+3 mm, −3+2 mm, and −2+1 mm Fine Coal separation than the medium of different Fine particles content by ash segregation. A 100 mm bed height with a medium of 33% Fine particles was selected to separate −6+3 mm Fine Coal. The ash content of cleaned Coal reached 9.66% under the optimized conditions, whereas the clean Coal yield reached more than 77.75%. For −3+2 mm Fine Coal, the cleaned Coal yield was 82...
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characteristics of bubble and Fine Coal separation using active pulsing air dense medium fluidized bed
Powder Technology, 2014Co-Authors: Liang Dong, Yuemin Zhao, Bo Zhang, Chenlong Duan, Xuliang YangAbstract:Abstract Coal is one of the most important primary energy. Coal firing is the principal cause of global warming and acid rain. With the worsening environmental pollution, the Coal preparation becomes very important. In this study, a novel technology based on active pulsing air dense medium fluidized bed (PFB) for Fine Coal preparation was investigated. The forces acting on particles under different conditions were analyzed. The results show that bubbles in PFB are smaller than those in traditional air dense medium fluidized bed (ADMFB), and smaller bubbles are better for Fine Coal separation. When f = 1.92 Hz, clean Coal was obtained with the ash content reduced by 23.83% compared with raw Coal and the tailings ash content was increased by 25.99%.
Liang Dong - One of the best experts on this subject based on the ideXlab platform.
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Kinematic properties and beneficiation performance of Fine Coal in a continuous vibrated gas-fluidized bed separator
Fuel, 2015Co-Authors: Xuliang Yang, Enhui Zhou, Zhijie Fu, Yuemin Zhao, Liang Dong, Haishen JiangAbstract:Abstract Dry beneficiation of Fine Coal is increasingly significant for the clean utilization of Coal resources in drought regions. In this paper, a continuous vibrated gas-fluidized bed separator was developed for Fine Coal dry beneficiation. The fluidization behavior and the kinematic properties of Fine Coal particles in this separator were systematically investigated. The results show that the bed expansion increases linearly with the superficial air velocity and theoretically, higher bed expansion benefits the hindered settling process of Fine Coal particles. However, larger superficial air velocity will induce intense fluctuation in bed surface. The conveying velocity of particles is mainly determined by the vibration angle and a predicted model is established by the nonlinear regression analysis. The kinematic properties underlying the particles diffusion in the separator are theoretically analyzed and a theoretical model of bed height distribution is established and this model fits the measured value well. The beneficiation performance of this separator is also evaluated by separating −3 + 1 mm Fine Coal. The results show that the probable error, E , is 0.225, indicating a continuous vibrated gas-fluidized bed separator can achieve a satisfactory performance.
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high ash Fine Coal dry cleaning and stability of shallow bed dense phase gas solid separation fluidized bed
Energy & Fuels, 2014Co-Authors: Bo Zhang, Shulei Song, Yuemin Zhao, Liang Dong, Jianqing Wang, Liping Peng, Xuliang YangAbstract:Fine Coal dry separation technology has been one of the international research hotspots in the field of Coal preparation. This article proposes the shallow bed dense-phase gas–solid fluidized bed separation technology to remove gangue from the high ash Fine Coal. According to the criterion of center pressure drop, the CP value can be finally reduced by reducing the bed height, H, to decrease the bed pressure drop, ΔPB, under the condition of a fixed gas distributor pressure drop, ΔPD. A fluidized bed of uniform and stable density was formed. The medium of 33% Fine particles showed a better performance in −6+3 mm, −3+2 mm, and −2+1 mm Fine Coal separation than the medium of different Fine particles content by ash segregation. A 100 mm bed height with a medium of 33% Fine particles was selected to separate −6+3 mm Fine Coal. The ash content of cleaned Coal reached 9.66% under the optimized conditions, whereas the clean Coal yield reached more than 77.75%. For −3+2 mm Fine Coal, the cleaned Coal yield was 82...
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characteristics of bubble and Fine Coal separation using active pulsing air dense medium fluidized bed
Powder Technology, 2014Co-Authors: Liang Dong, Yuemin Zhao, Bo Zhang, Chenlong Duan, Xuliang YangAbstract:Abstract Coal is one of the most important primary energy. Coal firing is the principal cause of global warming and acid rain. With the worsening environmental pollution, the Coal preparation becomes very important. In this study, a novel technology based on active pulsing air dense medium fluidized bed (PFB) for Fine Coal preparation was investigated. The forces acting on particles under different conditions were analyzed. The results show that bubbles in PFB are smaller than those in traditional air dense medium fluidized bed (ADMFB), and smaller bubbles are better for Fine Coal separation. When f = 1.92 Hz, clean Coal was obtained with the ash content reduced by 23.83% compared with raw Coal and the tailings ash content was increased by 25.99%.
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Fine Coal dry cleaning using a vibrated gas fluidized bed
Fuel Processing Technology, 2013Co-Authors: Xuliang Yang, Shulei Song, Yuemin Zhao, Chenlong Duan, Liang DongAbstract:Abstract Fine Coal (− 6 mm) cleaning in a dry way becomes more important with the extensive deployment of the mechanized mining and progressively serious water shortage, especially in North-West China. In this paper, we attempted to use the segregation in a vibrated gas-fluidized bed of dissimilar particles to provide a solution to this problem. The effects of several factors including the superficial air velocity, bed height, vibration intensity and fluidizing time on the segregation performance were experimentally studied. The bubble-driven jigging mechanism was proposed to explain the separation process. The results show that the probable error E values of the separation of − 6 + 3 mm and − 3 + 1 mm size fraction of feed Coal samples are 0.19 and 0.175 respectively, which indicates that Fine Coal separation using a vibrated gas-fluidized bed can provide a simple and efficient way for Coal cleaning in dry and cold regions in North-West China.
Yuemin Zhao - One of the best experts on this subject based on the ideXlab platform.
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Fine Coal desulphurization and microwave energy absorption behaviour by microwave magnetic separation
Canadian Journal of Chemical Engineering, 2017Co-Authors: Bo Zhang, Chenyang Zhou, Yuemin ZhaoAbstract:Microwave energy has been used to improve the Coal-pyrite magnetism, while magnetic medium has been added to enhance the microwave energy. Hence, there will be a secondary gradient magnetic chain, which can improve the desulphurization process through magnetic separation. Microwave energy and medium synergistic effects are able to readily improve the magnetic desulphurization process for Fine Coal. The present paper has studied the impact of microwave energy on the magnetic desulphurization process for Fine Coal. Intrinsic electromagnetic parameters of different materials were used to analyze and predict the equivalent dielectric parameters of the Fine Coal layer. The electromagnetic parameter according to the effective medium theory equation for Fine Coal was established. Coal specific susceptibility is related to pyrite content and pyrrhotite content in pyrite. The specific susceptibility values for the three types of Coals were found to be in the following order: Lu'an (LA) Coal > Weinan (WN) Coal > Yiluo (YL) Coal. The most suitable value for LA high-sulphur Coal's sulphur content after being separated by dry type rare earth roll strong magnetic separator appeared to be 60 s delayed in nitrogen atmosphere compared to the corresponding value in an air atmosphere. LA Fine Coal sulphur content reduced to 2.05 % from 3.66 %, and the microwave magnetic separation desulphurization rate was 44 %.
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Kinematic properties and beneficiation performance of Fine Coal in a continuous vibrated gas-fluidized bed separator
Fuel, 2015Co-Authors: Xuliang Yang, Enhui Zhou, Zhijie Fu, Yuemin Zhao, Liang Dong, Haishen JiangAbstract:Abstract Dry beneficiation of Fine Coal is increasingly significant for the clean utilization of Coal resources in drought regions. In this paper, a continuous vibrated gas-fluidized bed separator was developed for Fine Coal dry beneficiation. The fluidization behavior and the kinematic properties of Fine Coal particles in this separator were systematically investigated. The results show that the bed expansion increases linearly with the superficial air velocity and theoretically, higher bed expansion benefits the hindered settling process of Fine Coal particles. However, larger superficial air velocity will induce intense fluctuation in bed surface. The conveying velocity of particles is mainly determined by the vibration angle and a predicted model is established by the nonlinear regression analysis. The kinematic properties underlying the particles diffusion in the separator are theoretically analyzed and a theoretical model of bed height distribution is established and this model fits the measured value well. The beneficiation performance of this separator is also evaluated by separating −3 + 1 mm Fine Coal. The results show that the probable error, E , is 0.225, indicating a continuous vibrated gas-fluidized bed separator can achieve a satisfactory performance.
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Process analysis of Fine Coal preparation using a vibrated gas-fluidized bed
Powder Technology, 2015Co-Authors: Xuliang Yang, Enhui Zhou, Zhijie Fu, Jie Zhao, Yuemin ZhaoAbstract:Abstract Fine Coal dry preparation becomes more and more significant for countries and regions which have insufficient processing water. Fine Coal separation based on density segregation in a vibrated gas-fluidized bed (VGFB) does not use water and dense medium and has a good separation performance. This paper attempted to carry out a systematic process analysis of Fine Coal preparation in a VGFB. Particles distribution characteristics were experimentally studied and it was pointed out that a VGFB of Fine Coal having a periodic slugging behavior could obtain a good performance of density segregation. Furthermore, the effects of several operational factors on the stratification performance were studied using Box–Behnken response surface methodology (RSM) and the RSM analysis indicated that several factors including superficial air velocity, vibration intensity and bed height all had significant effects. Among these factors, the superficial air velocity behaved considerably more significant than others. Under the optimal operational conditions determined by the RSM analysis, the results of − 6 + 3 mm Fine Coal preparation in a VGFB showed that the yield and ash content are 76.68% and 25.15% as to the clean Coal product, and 23.32% and 60.08% as to the gangue product, respectively. The probable error E value is 0.18, indicating a good performance of Fine Coal dry preparation in a VGFB.
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Fine Coal dry cleaning using an air dense medium fluidized bed with improved magnetite medium
Procedia Engineering, 2015Co-Authors: Yuemin Zhao, Zhenfu Luo, Zhijie Fu, Shulei Song, Chenglong Duan, Xuliang Yang, Luhui CaiAbstract:Coal beneficiation using air dense medium fluidized bed offers a number of advantages and provides an efficient solution for Coal cleaning in a dry way. Recently, the development of the air dense medium fluidized bed mainly concentrate on the coarse Coal (+6 mm), and it is also reported that Fine Coal (-6 mm) is hard to be separated by conventional magnetite medium. The objective of this study is to using four types of magnetite powders with different narrow size range to separate -6+3 mm Fine Coal. The pressure-drop performance of the different magnetite medium in fluidized bed was also experimentally studied. The results show that the Finer magnetite powders have a lower pressure-drop and minimum fluidization velocity than the coarse magnetite powders, and the -6+3 mm Fine Coal can be separated effectively by -0.15+0.074 mm magnetite powders, which will expand the lower separation limit of the air dense medium fluidized bed.
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high ash Fine Coal dry cleaning and stability of shallow bed dense phase gas solid separation fluidized bed
Energy & Fuels, 2014Co-Authors: Bo Zhang, Shulei Song, Yuemin Zhao, Liang Dong, Jianqing Wang, Liping Peng, Xuliang YangAbstract:Fine Coal dry separation technology has been one of the international research hotspots in the field of Coal preparation. This article proposes the shallow bed dense-phase gas–solid fluidized bed separation technology to remove gangue from the high ash Fine Coal. According to the criterion of center pressure drop, the CP value can be finally reduced by reducing the bed height, H, to decrease the bed pressure drop, ΔPB, under the condition of a fixed gas distributor pressure drop, ΔPD. A fluidized bed of uniform and stable density was formed. The medium of 33% Fine particles showed a better performance in −6+3 mm, −3+2 mm, and −2+1 mm Fine Coal separation than the medium of different Fine particles content by ash segregation. A 100 mm bed height with a medium of 33% Fine particles was selected to separate −6+3 mm Fine Coal. The ash content of cleaned Coal reached 9.66% under the optimized conditions, whereas the clean Coal yield reached more than 77.75%. For −3+2 mm Fine Coal, the cleaned Coal yield was 82...
Shulei Song - One of the best experts on this subject based on the ideXlab platform.
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Fine Coal dry cleaning using an air dense medium fluidized bed with improved magnetite medium
Procedia Engineering, 2015Co-Authors: Yuemin Zhao, Zhenfu Luo, Zhijie Fu, Shulei Song, Chenglong Duan, Xuliang Yang, Luhui CaiAbstract:Coal beneficiation using air dense medium fluidized bed offers a number of advantages and provides an efficient solution for Coal cleaning in a dry way. Recently, the development of the air dense medium fluidized bed mainly concentrate on the coarse Coal (+6 mm), and it is also reported that Fine Coal (-6 mm) is hard to be separated by conventional magnetite medium. The objective of this study is to using four types of magnetite powders with different narrow size range to separate -6+3 mm Fine Coal. The pressure-drop performance of the different magnetite medium in fluidized bed was also experimentally studied. The results show that the Finer magnetite powders have a lower pressure-drop and minimum fluidization velocity than the coarse magnetite powders, and the -6+3 mm Fine Coal can be separated effectively by -0.15+0.074 mm magnetite powders, which will expand the lower separation limit of the air dense medium fluidized bed.
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high ash Fine Coal dry cleaning and stability of shallow bed dense phase gas solid separation fluidized bed
Energy & Fuels, 2014Co-Authors: Bo Zhang, Shulei Song, Yuemin Zhao, Liang Dong, Jianqing Wang, Liping Peng, Xuliang YangAbstract:Fine Coal dry separation technology has been one of the international research hotspots in the field of Coal preparation. This article proposes the shallow bed dense-phase gas–solid fluidized bed separation technology to remove gangue from the high ash Fine Coal. According to the criterion of center pressure drop, the CP value can be finally reduced by reducing the bed height, H, to decrease the bed pressure drop, ΔPB, under the condition of a fixed gas distributor pressure drop, ΔPD. A fluidized bed of uniform and stable density was formed. The medium of 33% Fine particles showed a better performance in −6+3 mm, −3+2 mm, and −2+1 mm Fine Coal separation than the medium of different Fine particles content by ash segregation. A 100 mm bed height with a medium of 33% Fine particles was selected to separate −6+3 mm Fine Coal. The ash content of cleaned Coal reached 9.66% under the optimized conditions, whereas the clean Coal yield reached more than 77.75%. For −3+2 mm Fine Coal, the cleaned Coal yield was 82...
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Fine Coal dry beneficiation using autogenous medium in a vibrated fluidized bed
International Journal of Mineral Processing, 2013Co-Authors: Xuliang Yang, Shulei Song, Yuemin Zhao, Zengqiang ChenAbstract:Abstract Dry beneficiation of Fine Coal (− 6 mm) using autogenous medium in a vibrated fluidized bed has been studied. The results show that in the particulate bed of Fine Coal, most of − 1 + 0.5 mm size fractions of Coal and a small portion of − 0.5 mm size fraction of Coal having high ash content contribute to the formation of an autogenous medium bed. This provides a favorable fluidization environment for the stratification process of Fine Coal particles depending on their density difference. The main operational parameters including superficial air velocity, vibration frequency and amplitude, initial bed height and separating time all have significant influences on the stratification performance of the particulate bed of Fine Coal. The batch separation results of Wuhai Fine Coal in an autogenous medium vibrated fluidized bed show that the separation efficiency, i.e. the probable error E , is 0.14, indicating that dry beneficiation of Fine Coal using an autogenous medium vibrated fluidized bed is a promising technique for Coal cleaning in dry regions.
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Fine Coal dry cleaning using a vibrated gas fluidized bed
Fuel Processing Technology, 2013Co-Authors: Xuliang Yang, Shulei Song, Yuemin Zhao, Chenlong Duan, Liang DongAbstract:Abstract Fine Coal (− 6 mm) cleaning in a dry way becomes more important with the extensive deployment of the mechanized mining and progressively serious water shortage, especially in North-West China. In this paper, we attempted to use the segregation in a vibrated gas-fluidized bed of dissimilar particles to provide a solution to this problem. The effects of several factors including the superficial air velocity, bed height, vibration intensity and fluidizing time on the segregation performance were experimentally studied. The bubble-driven jigging mechanism was proposed to explain the separation process. The results show that the probable error E values of the separation of − 6 + 3 mm and − 3 + 1 mm size fraction of feed Coal samples are 0.19 and 0.175 respectively, which indicates that Fine Coal separation using a vibrated gas-fluidized bed can provide a simple and efficient way for Coal cleaning in dry and cold regions in North-West China.
B. K. Parekh - One of the best experts on this subject based on the ideXlab platform.
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dewatering of Fine Coal and refuse slurries problems and possibilities
Procedia Earth and Planetary Science, 2009Co-Authors: B. K. ParekhAbstract:Abstract Dewatering of Fine clean Coal and refuse slurry is one of the most important aspects of Coal cleaning scenario. It is also adds significant cost to the price of clean Coal. This article summarizes the current state-of-the art of dewatering being practiced around the world and discuses some of the upcoming novel dewatering technologies. Hyperbaric filter provides a low moisture product for Fine Coal slurries. For Fine Coal refuse slurries the Deep Cone Thickener provides dewatered product containing 50 percent solids. The article also discusses economics of dewatering, which is about $3.30/t for Fine clean Coal slurries.
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Picobubble Column Flotation of Fine Coal
International Journal of Coal Preparation and Utilization, 2008Co-Authors: Samuel Yu, Xiaohua Zhou, Rick Honaker, B. K. ParekhAbstract:Froth flotation is widely used in the Coal industry to clean −28 mesh (0.6 mm) or −100 mesh (0.15 mm) Fine Coal. A successful recovery of particles by flotation depends on efficient particle-bubble collision and attachment with minimal subsequent particle detachment from bubble. Flotation is effective in a narrow size range, nominally 10–100 µm, beyond which the flotation efficiency drops sharply. A fundamental analysis has shown that use of picobubbles can significantly improve the flotation recovery of particles by increasing the probability of collision and attachment and reducing the probability of detachment. A specially designed column with a picobubble generator has been developed for enhanced recovery of Fine Coal particles. Picobubbles were produced based on the hydrodynamic cavitation principle. Experimental results have shown that the use of picobubbles in a 5-cm diameter column flotation increased the combustible recovery of a highly floatable Coal by up to 10% and that of a poorly floatable c...
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Paste Thickening of Fine Coal Refuse
Coal Preparation, 2007Co-Authors: D. P. Patil, Rick Honaker, B. K. ParekhAbstract:The Coal industry is being subjected to increasing public scrutiny with regards to its effect on the environment and impact on public health and safety. Recently, disposal and storage of Fine Coal waste slurry has drawn considerable public attention. This article discusses the emerging paste thickening technology as a possible solution to the Fine Coal waste slurry disposal problem. Paste-thickening studies were conducted on thickener underflow slurry from a central Appalachia preparation plant. Initial experiments were conducted with a laboratory scale T-Floc apparatus to optimize flocculant dosages to obtain maximum settling flux and underflow solids concentration. Results showed that the addition of anionic flocculant (400 g/t) to the slurry followed by cationic flocculant (100 g/t) provided the highest settling flux (3.85 tonnes/hr/m2) and solids concentration (35% by weight). Pilot-scale paste thickening tests were conducted using a Dorr-Oliver Eimco Deepcone™ thickener. The thickener concentrated th...
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Determination of Free and Bound Water in Fine Coal Filter Cake
Coal Preparation, 2004Co-Authors: D. P. Patil, B. K. ParekhAbstract:The bound water in Fine Coal filter cake represents the water that cannot be removed using mechanical dewatering techniques. The amount of bound water in a Fine Coal filter cake, in other words, represents the moisture content achievable by an ideal dewatering technique. In this study the dilatometer technique was used to measure the bound and free water in a Fine Coal filter cake. Results showed that addition of cationic (0.25 kg/t) and non-ionic (1 kg/t) surfactants reduced the bound water content in the filter cake from 13.73% to 3.72% and 8.28%, respectively. Decrease in bound water content was attributed to the adsorption of surfactants on the Coal surface, which increased the Coal hydrophobicity. Addition of 10 g/t of cationic and anionic flocculants also reduced the bound water content from 13.73% to 4.58% and 6.63%, respectively, which was attributed to the replacement of surface water molecules with the polymer. Based on the free and bound water data, ideal dewatering curves were developed for bo...
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Enhanced Fine Coal beneficiation using ultrasonic energy
Mining Metallurgy & Exploration, 2000Co-Authors: B. K. ParekhAbstract:Fine Coal particles are difficult to separate effectively from liquids or other solids. Ultrasonic energy may be used to enhance the efficiency of the conventional Fine-particle separation processes widely used in the Coal and mineral industries. Flotation, settling and dew ate ring tests were conducted using several Fine Coal samples to study the effects of ultrasonic treatment on these processes. Process variables such as particle size, ultrasonic treatment time and solids concentration were investigated for their impacts on ultrasonic treatment effectiveness. The results obtained from this study showed that ultrasonic treatment is an effective approach for enhancing solid/solid separation in flotation and solid/liquid separation in sedimentation and dewatering of Fine Coal. SEM microphotographs demonstrate that ultrasonics cleaned particle surfaces, which is, in part, responsible for the observed improvement in Fine Coal separation processes.