Article
Acoustics
Yuran Chen, Saeed Chehreh Chelgani, Xiangning Bu, Guangyuan Xie
Summary: The study found that the highest metallurgical responses in flotation were achieved under the highest examined USW frequency (600 kHz), while lower frequencies resulted in poorer outcomes. Observation and theoretical calculations revealed that frequency influences the formation of carrier bubbles and the action of secondary acoustic force during USW-assisted flotation, impacting the success of fine particle flotation.
ULTRASONICS SONOCHEMISTRY
(2021)
Article
Engineering, Chemical
Dan Cao, Xianzhen Xu, Song Jiang
Summary: Through experimental research, it is found that when the dosage of anhydrous ethanol is 30 ml, ultrasound treatment time is 20 minutes, electrolysis current is 1.5 A, and ultrasound power is 250 W, the desulfurization rate and cleaned coal yield of ultrasound-electrochemistry enhanced flotation and desulphurization method reached 75.42% and 72.15% respectively. The combination of ultrasound and electrochemistry has a better desulfurization effect on fine coal than ultrasound-enhanced flotation or electrochemistry method.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Acoustics
Lizhang Jin, Weidong Wang, Yanan Tu, Kanghui Zhang, Ziqi Lv
Summary: Ultrasonic flotation is an effective method for floating fine coal by promoting the aggregation of bubbles and coal bubbles. The frequency of standing waves can affect the formation of aggregates and coal recovery rate.
ULTRASONICS SONOCHEMISTRY
(2021)
Article
Engineering, Chemical
Hangil Park, Liguang Wang
Summary: This paper introduces a new sensor for real-time monitoring of coal flotation based on drag measurement, with an on-site trial in a coking coal flotation plant in Queensland, Australia demonstrating its effectiveness. The output of the sensor showed a strong linear correlation with clean coal yield, with a coefficient of determination of 0.97.
MINERALS ENGINEERING
(2021)
Article
Chemistry, Multidisciplinary
Xianwu Huang, Yuxiao Wang, Haili Shang, Jinshan Zhang
Summary: Visual feature information of flotation foam is crucial but the collected foam images in the floatation field are noisy and blurry, posing challenges for feature extraction and segmentation. This study presents a method to repair blurred pixels in foam images, enhancing the image dataset for network model training and providing high-quality images for foam-feature extraction. Additionally, a novel fifth-order residual structure is introduced to enlarge the network structure and improve the learning ability of complex networks. Experimental results show that the suggested method achieves satisfactory repair effects for foam images under various blurring conditions, laying a foundation for intelligent adjustment of flotation field parameters.
Article
Chemistry, Analytical
Jin-Chen Hsu, Chih-Yu Chang
Summary: In this study, acoustic aggregation and separation of microparticles in fluid channels driven by standing Lamb waves were achieved. The counter-propagating lowest-order antisymmetric and symmetric Lamb modes were excited on a double-side polished lithium-niobate (LiNbO3) plate, generating solid-fluid coupling and resulting in radiative acoustic pressure and streaming fields. Finite-element simulations and experiments confirmed the capability of particle aggregation and separation. Strong streaming dominated particle aggregation, while acoustic radiation force expelled particles of different sizes to achieve continuous separation.
Article
Engineering, Environmental
Xiaolong Gong, Wenming Jiang, Shengli Hu, Zhiyuan Yang, Xinwang Liu, Zitian Fan
Summary: Clay sand casting generates a large amount of foundry dust (FD) with coal powder, making it difficult to recycle. Landfilling the FD causes environmental pollution. By utilizing ultrasonic-assisted flotation and two-stage flotation, separation efficiency of coal powder and clay minerals can be significantly improved, facilitating comprehensive utilization of the FD.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Hua Han, An Liu, Caili Wang, Runquan Yang, Shuai Li, Huaifa Wang
Summary: The flotation kinetics of conventional and nanobubble (NB) flotation at different particle sizes were compared. The results showed that NBs can improve the flotation performance of various size fractions, increasing the combustible recovery but also the ash content of certain fractions. First-order models were found to be suitable for fitting the flotation data, with the classical first-order model being the most appropriate. NBs significantly enhanced the flotation rate of coarse particles but decreased it for medium-sized particles. The improved flotation speed of fine coal particles may be the reason for the enhanced performance of the raw sample flotation.
INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS
(2022)
Article
Energy & Fuels
Hongzheng Zhu, Gaochao Pan, Yong Zhang, Qinghui Shi, Hailing He, Zhanbei Ou, Lei Gao, Jinbo Zhu
Summary: By using a high-speed motion acquisition system, we investigated the trajectory of particles in the bubble trailing vortex. Two typical trajectories were measured. The effects of particle density, size, and fluid flow velocity on entrainment probability were analyzed. Our results provide valuable insights for the development of cleaner mineral flotation technology.
Article
Energy & Fuels
Gan Cheng, Yulong Li, Yijun Cao, Zhiguo Zhang
Summary: The presence of sulfur hinders the clean utilization of coking coal. Inorganic sulfur, mainly in the form of pyrite, contaminates clean coal during flotation, while organic sulfur can only be effectively removed chemically. Desulfurization using a combination of flotation and oxidation methods reduces inorganic sulfur more efficiently than organic sulfur. The sulfur and ash content in coal were reduced from 2.55% and 46.16% to 1.33% and 13.41%, respectively, through the flotation-oxidation method. However, the oxidation-flotation method led to the formation of Fe2O3 on pyrite surfaces and increased the presence of oxygen-containing functional groups, adsorption capacity of water molecules, and hydrophilicity. MD simulation supported the experimental results, showing a lower diffusion coefficient of water molecules on the surface of oxidized coal compared to raw coal. This reduced the hydrophobicity of coal and resulted in lower product recovery compared to the flotation-oxidation method.
Article
Energy & Fuels
Yinfei Liao, Zhe Yang, Maoyan An, Longfei Ma, Aosheng Yang, Yijun Cao, Luojian Chen, Hourui Ren
Summary: This study investigated the interaction between oil collector drop and coal particle in low-rank coal flotation. Different collectors were used and their interaction mechanisms were revealed through measurements such as wetting heats and FTIR analysis. The results showed that mixed collector obtained higher flotation efficiency.
Article
Engineering, Chemical
O. Guven, B. Kaymakoglu, A. Ehsani, A. Hassanzadeh, O. Sivrikaya
Summary: The impact of particle shape and surface properties on mineral systems has been overlooked in previous literature. This study investigated the effects of morphological variations on flotation kinetics using coal particles. The results showed that increased milling time resulted in increased roundness and roughness of the particles, leading to higher flotation rates. The findings were further supported by theoretical calculations of energy barriers.
Article
Engineering, Chemical
Chun Yong Ng, Hangil Park, Liguang Wang
Summary: The study demonstrates the effectiveness of using sound for improving coal flotation performance. It shows that sound can enhance the final combustible recovery, flotation rate constant and separation efficiency rate in different operating conditions, without significant impact on product ash content.
MINERALS ENGINEERING
(2021)
Article
Engineering, Civil
Vivek A. Bheeroo, Harry Yeh
Summary: The presence of a submerged sill near a vertical reflective wall can enhance wave amplitudes, worsen wave conditions in reef-lagoon spans, and increase higher harmonics of waves within a lagoon. The offshore reef may have minimal influence on standing wave formations except for a phase shift in the wave envelope.
COASTAL ENGINEERING
(2021)
Article
Chemistry, Physical
Anahita Keshmiri, Sascha Heitkam, Aleksandr Bashkatov, Milad Eftekhari, Kerstin Eckert, Behnam Keshavarzi
Summary: Ultrasound application enhances mass transfer in aqueous systems and can influence sorption processes. Previous studies have reported different impacts of ultrasound on sorption, such as increased desorption or adsorption. This study used low intensity ultrasound to evaluate the sorption process of Triton X-100 on a single bubble surface and found no significant change in surface tension and sorption dynamics after sonication. The results suggest that previous observations may be due to the additional energy input from the acoustic wave rather than the presence of an external acoustic field.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2023)
Article
Energy & Fuels
Xiangning Bu, Tuantuan Zhang, Yuran Chen, Guangyuan Xie, Yaoli Peng
INTERNATIONAL JOURNAL OF COAL PREPARATION AND UTILIZATION
(2020)
Article
Energy & Fuels
Guangqian Xu, Yuran Chen, Xiangning Bu, Xianshu Dong, Guangyuan Xie, Yujin Sun
ENERGY SOURCES PART A-RECOVERY UTILIZATION AND ENVIRONMENTAL EFFECTS
(2020)
Article
Engineering, Chemical
Xiangning Bu, Yuran Chen, Guangxi Ma, Yujin Sun, Chao Ni, Guangyuan Xie
Article
Engineering, Chemical
Yuran Chen, Jing Chang, Adrien Bussonniere, Guangyuan Xie, Qingxia Liu
Article
Acoustics
Yuran Chen, Hanrui Zheng, Vu N. T. Truong, Guangyuan Xie, Qingxia Liu
ULTRASONICS SONOCHEMISTRY
(2020)
Article
Acoustics
Yuran Chen, Chao Ni, Guangyuan Xie, Qingxia Liu
ULTRASONICS SONOCHEMISTRY
(2020)
Article
Acoustics
Yuran Chen, Saeed Chehreh Chelgani, Xiangning Bu, Guangyuan Xie
Summary: The study found that the highest metallurgical responses in flotation were achieved under the highest examined USW frequency (600 kHz), while lower frequencies resulted in poorer outcomes. Observation and theoretical calculations revealed that frequency influences the formation of carrier bubbles and the action of secondary acoustic force during USW-assisted flotation, impacting the success of fine particle flotation.
ULTRASONICS SONOCHEMISTRY
(2021)
Article
Electrochemistry
Yapeng Kong, Yu Xiao, Xuemin Liang, Yuran Chen, Liqiang Wang
Summary: The study found that using Ni-Fe alloy as an inert anode in molten state can effectively promote the direct electro-reduction of V2O3, with a rational formation of oxide scale structure that helps improve the quality of the metal vanadium product.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2021)
Article
Chemistry, Physical
Chao Ni, Shaoqi Zhou, Jixuan Gao, Xiangning Bu, Yuran Chen, Muidh Alheshibri, Guangyuan Xie, Biao Li
Summary: The recovery of spent carbon anode materials is important for environmental protection and resource recycling. This study analyzed the grinding characteristics of spent carbon anode from aluminum electrolysis in both ball mill and rod mill, and compared them using the selective Fuerstenau upgrading curves. The results showed that carbon particles in the spent carbon anode were closely associated with cryolite particles. Ball milling achieved a higher degree of selective comminution compared to rod milling.
PHYSICOCHEMICAL PROBLEMS OF MINERAL PROCESSING
(2022)
Article
Geochemistry & Geophysics
Chao Ni, Shaoqi Zhou, Xiangning Bu, Muhammad Bilal, Fawad Ul Hassan, Yuran Chen, Guangqian Xu, Guangyuan Xie
Summary: This study characterized a lignite sample from Shaanxi Province, China and found that the fluorine in coal is mainly contained in Muscovite and polylithionite, and partly in pyrite. The proposed combination of gravity-flotation separation process effectively reduced the fluorine content in lignite and met the coal standards.
Review
Engineering, Chemical
Yuran Chen, Pan Li, Xiangning Bu, S. Chehreh Chelgani, Yapeng Kong, Xuemin Liang
Summary: During the long-term operation of an aluminum electrolysis cell, there is a continuous infiltration and corrosion of molten salts on the pot lining, resulting in a significant amount of hazardous waste during maintenance. This study explores the properties of spent pot linings (SPL) and presents methods for detoxification and purification. It also examines the strategies for resource utilization and analyzes the current challenges and future prospects for the environmental recycling of SPL.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Engineering, Chemical
Runze Chen, Yuran Chen, Xuemin Liang, Yapeng Kong, Yangyang Fan, Quan Liu, Zhenyu Yang, Feiying Tang, Johnny Muya Chabu, Maru Dessie Walle, Liqiang Wang
Summary: A chemical oxidative exfoliation method has been developed to recycle spent cathode carbon (SCC) and produce decontaminated SCC with high-value graphene oxide (GO)-like carbon structures (SCC-GO), which exhibits excellent adsorption capacity for organic pollutants.
CHINESE JOURNAL OF CHEMICAL ENGINEERING
(2023)
Article
Engineering, Chemical
Yuran Chen, Pan Li, Xiangning Bu, Liqiang Wang, Xuemin Liang, S. Chehreh Chelgani
Summary: This study introduces an innovative method of oxidation-expansion acid leaching (OEAL) to eliminate impurities inside spent pot lining (SPL). The experimental results show that OEAL has the highest efficiency, with a removal rate of 99.36% for impurities. The fundamental mechanisms of impurity removal were systematically studied using different analytical techniques.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Chemistry, Analytical
Yujin Sun, Ning Jiang, Xianshu Dong, Yuping Fan, Maoqing Yang, Peng Xiong, Yuran Chen
Summary: In this study, the adsorption behavior of cationic polystyrene nanoparticles on amorphous carbon and SiO2 surfaces under different Na+ ion concentrations was investigated. The results showed that higher Na+ ion concentrations led to decreased adsorption capacities and faster adsorption rates on SiO2 surfaces compared to amorphous carbon surfaces.
Article
Materials Science, Multidisciplinary
Yapeng Kong, Yu Xiao, Xuemin Liang, Yangyang Fan, Liqiang Wang, Sheng Yang, Jilin He, Yuran Chen
Summary: We have successfully synthesized nanoscale tantalum powder by electro-deoxidation of Ta2O5 cathode in molten Na3AlF6-K3AlF6-AlF3. The cathodic process involves solid-liquid reaction between Ta2O5 and the electrolyte, forming MxTaO2+xF1-x (M = Na, K) intermediates which are further reduced electrochemically to form tantalum particles. By designing a new porous structure in the Ta2O5 cathode, we achieved the formation of uniform-sized MxTaO2+xF1-x particles with a regular cubic morphology. This study demonstrates the controllable synthesis of nanoscale metal powders and opens up possibilities for developing materials with desired morphology and particle size.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2023)
Article
Energy & Fuels
Yingna Du, Chen Huang, Wei Jiang, Qiangwei Yan, Yongfei Li, Gang Chen
Summary: In this study, anionic surfactants modified hydrotalcite was used as a flow improver for crude oil under low-temperature conditions. The modified hydrotalcite showed a significant viscosity reduction effect on crude oil. The mechanism of the modified hydrotalcite on viscosity and pour point of crude oil was explored through characterization and analysis of the modified hydrotalcite and oil samples.
Article
Energy & Fuels
Mohammad Saeid Rostami, Mohammad Mehdi Khodaei
Summary: In this study, a hybrid structure, MIL-53(Al)@MWCNT, was synthesized by combining MIL-53(Al) particles and -COOH functionalized multi-walled carbon nanotube (MWCNT). The hybrid structure was then embedded in a polyethersulfone (PES) polymer matrix to prepare a mixed matrix membrane (MMM) for CO2/CH4 and CO2/N2 separation. The addition of MWCNTs prevented MIL-53(Al) aggregation, improved membrane mechanical properties, and enhanced gas separation efficiency.
Article
Energy & Fuels
Yunlong Li, Desheng Huang, Xiaomeng Dong, Daoyong Yang
Summary: This study develops theoretical and experimental techniques to determine the phase behavior and physical properties of DME/flue gas/water/heavy oil systems. Eight constant composition expansion (CCE) tests are conducted to obtain new experimental data. A thermodynamic model is used to accurately predict saturation pressure and swelling factors, as well as the phase boundaries of N2/heavy oil systems and DME/CO2/heavy oil systems, with high accuracy.
Article
Energy & Fuels
Morteza Afkhamipour, Ebad Seifi, Arash Esmaeili, Mohammad Shamsi, Tohid N. Borhani
Summary: Non-conventional amines are being researched worldwide to overcome the limitations of traditional amines like MEA and MDEA. Adequate process and thermodynamic models are crucial for understanding the applicability and performance of these amines in CO2 absorption, but studies on process modeling for these amines are limited. This study used rate-based modeling and Deshmukh-Mather method to model CO2 absorption by DETA solution in a packed column, validated the model with experimental data, and conducted a sensitivity analysis of mass transfer correlations. The study also compared the CO2 absorption efficiency of DETA solution with an ionic solvent [bmim]-[PF6] and highlighted the importance of finding optimum operational parameters for maximum absorption efficiency.
Article
Energy & Fuels
Arastoo Abdi, Mohamad Awarke, M. Reza Malayeri, Masoud Riazi
Summary: The utilization of smart water in EOR operations has gained attention, but more research is needed to understand the complex mechanisms involved. This study investigated the interfacial tension between smart water and crude oil, considering factors such as salt, pH, asphaltene type, and aged smart water. The results revealed that the hydration of ions in smart water plays a key role in its efficacy, with acidic and basic asphaltene acting as intrinsic surfactants. The pH also influenced the interfacial tension, and the aged smart water's interaction with crude oil depended on asphaltene type, salt, and salinity.
Article
Energy & Fuels
Dongao Zhu, Kun Zhu, Lixian Xu, Haiyan Huang, Jing He, Wenshuai Zhu, Huaming Li, Wei Jiang
Summary: In this study, cobalt-based metal-organic frameworks (Co-based MOFs) were used as supports and co-catalysts to confine the NHPI catalyst, solving the leaching issue. The NHPI@Co-MOF with carboxyl groups exhibited stronger acidity and facilitated the generation of active oxygen radicals O2•, resulting in enhanced catalytic activity. This research provides valuable insights into the selection of suitable organic linkers and broadens the research horizon of MOF hybrids in efficient oxidative desulfurization (ODS) applications.
Article
Energy & Fuels
Edwin G. Hoyos, Gloria Amo-Duodu, U. Gulsum Kiral, Laura Vargas-Estrada, Raquel Lebrero, Rail Munoz
Summary: This study investigated the impact of carbon-coated zero-valent nanoparticle concentration on photosynthetic biogas upgrading. The addition of nanoparticles significantly increased microalgae productivity and enhanced nitrogen and phosphorus assimilation. The presence of nanoparticles also improved the quality of biomethane produced.
Article
Energy & Fuels
Yao Xiao, Asma Leghari, Linfeng Liu, Fangchao Yu, Ming Gao, Lu Ding, Yu Yang, Xueli Chen, Xiaoyu Yan, Fuchen Wang
Summary: Iron is added as a flocculant in wastewater treatment and the hydrothermal carbonization (HTC) of sludge produces wastewater containing Fe. This study investigates the effect of aqueous phase (AP) recycling on hydrochar properties, iron evolution and environmental assessment during HTC of sludge. The results show that AP recycling process improves the dewatering performance of hydrochar and facilitates the recovery of Fe from the liquid phase.
Article
Energy & Fuels
He Liang, Tao Wang, Zhenmin Luo, Jianliang Yu, Weizhai Yi, Fangming Cheng, Jingyu Zhao, Xingqing Yan, Jun Deng, Jihao Shi
Summary: This study investigated the influence of inhibitors (carbon dioxide, nitrogen, and heptafluoropropane) on the lower flammability limit of hydrogen and determined the critical inhibitory concentration needed for complete suppression. The impact of inhibitors on explosive characteristics was evaluated, and the inhibitory mechanism was analyzed with chemical kinetics. The results showed that with the increase of inhibitor quantity, the lower flammability limit of hydrogen also increased. The research findings can contribute to the safe utilization of hydrogen energy.
Article
Energy & Fuels
Zonghui Liu, Zhongze Zhang, Yali Zhou, Ziling Wang, Mingyang Du, Zhe Wen, Bing Yan, Qingxiang Ma, Na Liu, Bing Xue
Summary: In this study, high-performance solid catalysts based on phosphotungstic acid (HPW) supported on Zr-SBA-15 were synthesized and evaluated for the one-pot conversion of furfural (FUR) to γ-valerolactone (GVL). The catalysts were characterized using various techniques, and the ratio of HPW and Zr was found to significantly affect the selectivity of GVL. The HPW/Zr-SBA-15 (2-4-15) catalyst exhibited the highest GVL yield (83%) under optimized reaction conditions, and it was determined that a balance between Bronsted acid sites (BAS) and Lewis acid sites (LAS) was crucial for achieving higher catalytic performance. The reaction parameters and catalyst stability were also investigated.
Article
Energy & Fuels
Michael Stoehr, Stephan Ruoff, Bastian Rauch, Wolfgang Meier, Patrick Le Clercq
Summary: As part of the global energy transition, an experimental study was conducted to understand the effects of different fuel properties on droplet vaporization for various conventional and alternative fuels. The study utilized a flow channel to measure the evolution of droplet diameters over time and distance. The results revealed the temperature-dependent effects of physical properties, such as boiling point, liquid density, and enthalpy of vaporization, and showed the complex interactions of preferential vaporization and temperature-dependent influences of physical properties for multi-component fuels.
Article
Energy & Fuels
Yuan Zhuang, Ruikang Wu, Xinyan Wang, Rui Zhai, Changyong Gao
Summary: Through experimental validation and optimization of the chemical kinetic model, it was found that methanol can accelerate the oxidation reaction of ammonia, and methanol can be rapidly oxidized at high concentration. HO2 was found to generate a significant amount of OH radicals, facilitating the oxidation of methanol and ammonia. Rating: 7.5/10.
Article
Energy & Fuels
Radwan M. EL-Zohairy, Ahmed S. Attia, A. S. Huzayyin, Ahmed I. EL-Seesy
Summary: This paper presents a lab-scale experimental study on the impact of diethyl ether (DEE) as an additive to waste cooking oil biodiesel with Jet A-1 on combustion and emission features of a swirl-stabilized premixed flame. The addition of DEE to biodiesel significantly affects the flame temperature distribution and emissions. The W20D20 blend of DEE, biodiesel, and Jet A-1 shows similar flame temperature distribution to Jet A-1 and significantly reduces UHC, CO, and NOx emissions compared to Jet A-1.
Article
Energy & Fuels
Jiang Bian, Ziyuan Zhao, Yang Liu, Ran Cheng, Xuerui Zang, Xuewen Cao
Summary: This study presents a novel method for ammonia separation using supersonic flow and develops a mathematical model to investigate the condensation phenomenon. The results demonstrate that the L-P nucleation model accurately characterizes the nucleation process of ammonia at low temperatures. Numerical simulations also show that increasing pressure and concentration can enhance ammonia condensation efficiency.
Article
Energy & Fuels
Shiyuan Pan, Xiaodan Shi, Beibei Dong, Jan Skvaril, Haoran Zhang, Yongtu Liang, Hailong Li
Summary: Integrating CO2 capture with biomass-fired combined heat and power (bio-CHP) plants is a promising method for achieving negative emissions. This study develops a reliable data-driven model based on the Transformer architecture to predict the flowrate and CO2 concentration of flue gas in real time. The model validation shows high prediction accuracy, and the potential impact of meteorological parameters on model accuracy is assessed. The results demonstrate that the Transformer model outperforms other models and using near-infrared spectral data as input features improves the prediction accuracy.
