Article
Engineering, Chemical
J. Yianatos, P. Vallejos
Summary: In this paper, the metallurgical performance of flotation cells was evaluated based on the cell volume and operating variables. The results showed that increasing the cell volume leads to a higher bubble loading, and the use of internal launders expands the range of operating conditions.
MINERALS ENGINEERING
(2022)
Article
Engineering, Environmental
Ao Xie, David A. Ladner, Sudeep C. Popat
Summary: The high fat content in rendering wastewater requires primary treatment to remove floatable fats. The recovery of waste fats is an additional benefit from the primary treatment. Dissolved air flotation (DAF) is commonly used but has disadvantages. This study explores the use of electrocoagulation-electroflotation (EC-EF) as an alternative method. EC-EF shows better performance in COD removal and can concentrate and preserve long chain fatty acids. Higher current densities in the electrochemical cell generate surplus coagulants for further coagulation. Longer mixing duration in the post-EC-EF treatment step enhances overall COD removal.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Engineering, Chemical
M. J. Cole, K. P. Galvin, J. E. Dickinson
Summary: The study investigated the relationship between concentrate grade, recovery, and feed throughput using the Reflux Flotation Cell, showing that preserving the gas to feed flux ratio and minimizing the gas flux are key strategies to maintain high product grade. Controlling the downward flux of wash water was also crucial in maintaining high recovery rates.
MINERALS ENGINEERING
(2021)
Article
Engineering, Chemical
Bingyu Yang, Hangil Park, Liguang Wang
Summary: Dynamic stabilization of froth using acoustic sound at a frequency of 400 Hz can increase the froth carry rate and mass pull in column flotation operations without extensive capital and additional operating expenditure. Experimental results showed that applying acoustic sound to the column flotation increased the froth carry rate by up to 20% and mass pull by up to 19%.
MINERALS ENGINEERING
(2023)
Article
Energy & Fuels
M. J. Cole, J. E. Dickinson, K. P. Galvin
Summary: This study examines the separation performance achieved using the Reflux Flotation Cell (RFC) when treating low economic value coal waste streams over a range of feed solids concentrations. The study found that as the feed solids concentration was increased, the flux of hydrophobic particles fed to the RFC increased in a fixed ratio to the flux of hydrophilic particles. The relationship between bubble surface coverage and hydrophobic particle recovery was also investigated.
Article
Green & Sustainable Science & Technology
Yake Yao, Kui Zhou, Jingfeng He, Lingtao Zhu, Yuemin Zhao, Qiang Bai
Summary: The study investigated the flotation performance of metallic elements in waste printed circuit boards, finding that using diesel oil as the collector yielded better recovery results under specific conditions.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Engineering, Chemical
Ramon Arellano-Pina, Elvia Angelica Sanchez-Ramirez, E. Emmanuel Vazquez-Sanchez, Roberto Perez-Garibay, Jaime Cristobal Rojas-Montes
Summary: This study proposes a method to improve low gold recovery by making relevant changes in a grinding and flash flotation circuit, which are validated through optical ore characterization, mathematical modeling, and steady state process simulation. The installation of a regrinding mill with recirculation to a flash cell in the redesigned circuit significantly increased gold recovery.
MINERALS ENGINEERING
(2023)
Article
Chemistry, Multidisciplinary
Yang Cao, Lei Sun, Qingqing Wang, Xin Wang, Yi Qiao, Wei Sun
Summary: This study investigates the efficiency and sustainability of tin resource utilization by using a novel collector, DHX, for cassiterite flotation. The results demonstrate that DHX exhibits superior collection efficiency and a broader effective pH range compared to conventional alternatives. The collector also shows remarkable selectivity in separating cassiterite from other minerals. The study emphasizes the immense potential of DHX as a cassiterite flotation collector.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2023)
Article
Chemistry, Physical
Jiseon Kim, Chong Min Chung, Kangwoo Cho, Tai Hak Chung
Summary: This study provides practical guidelines for the gas to solids (G/S) ratio as the governing parameter in electroflotation (EF) based on theoretical estimates and experiments for clarification of activated sludge.
Article
Engineering, Environmental
Wang Linsong, Gao Zhiyong, Tang Honghu, Wang Li, Han Haisheng, Sun Wei, Qu Yongbao, Yang Yue
Summary: In this study, a method of enhancing flotation for recovering copper from copper slag by adding sodium carbonate and mechanical activation was developed. The results showed that adding sodium carbonate before wet grinding can change the surface energy of copper slag particles and increase the possibility of cracks between chalcocite particles and gangue particles, thereby improving the flotation effect.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Engineering, Chemical
Jiaozhong Cai, Bozeng Wu, Jiushuai Deng, Mingzhen Hu, Mingzhen Wu, Pingping Wei, Xiaohao Sun, Hongxin Qiu, Xiaoli Jin, Xiao'an Hou, Hongxiang Xu
Summary: This study investigated a novel method of promoting cassiterite flotation by adding Pb-BHA complexes during the grinding process. The results showed that adding Pb-BHA complexes before grinding significantly improved the cassiterite flotation recovery, and similar effects were observed for artificial mixed minerals of cassiterite and quartz. Fourier-transform infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS) analyses provided further evidence of the enhanced adsorption of Pb-BHA complexes on the cassiterite surface when added before grinding.
Article
Chemistry, Multidisciplinary
Negin Amini, Bo Fan, Tina Hsia, Ellen M. Moon, Karen Hapgood, San H. Thang
Summary: This study investigated the synthesis of a novel polymer through RAFT polymerization for use as a surfactant in ultrafine minerals recovery. The novel emulsion demonstrated stability and high viscosity, and achieved comparable mineral recovery to traditional emulsions.
Article
Materials Science, Multidisciplinary
Feng Liu, Dawei Yu, Sam Marcuson, Mansoor Barati
Summary: Utilizing a thermal concentration process to recover nickel content in pyrrhotite tailings as ferronickel alloy can reduce the loss of nickel values. Experimental and thermodynamic assessments were conducted to determine the appropriate iron addition rate and treatment temperature, discussing the effects of various process variables on the nickel grade and recovery in the magnetic product.
Article
Geochemistry & Geophysics
Polyxeni K. Tsave, Margaritis Kostoglou, Thodoris D. Karapantsios, Nikolaos K. Lazaridis
Summary: The size reduction of mined ore is necessary to release valuable materials. Fine particles are difficult to float due to their low collision efficiency with bubbles, resulting in the loss of valuable minerals. The flotation of fines can be enhanced by decreasing bubble diameter, increasing bubble apparent size, or improving the collector's adsorption.
Article
Biochemistry & Molecular Biology
Julia C. C. Steinbach, Fabio Fait, Hermann A. A. Mayer, Andreas Kandelbauer
Summary: This study focuses on the synthesis and properties of hybrid organic/inorganic nanocomposites. A quantitative model with high robustness and predictive power was established, demonstrating the complex nonlinear behaviors and partly synergistic interactions between process factors in determining the material properties.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2022)
Article
Engineering, Environmental
M. Gumulya, R. P. Utikar, V. K. Pareek, G. M. Evans, J. B. Joshi
Summary: 2D rectangular columns are often used for visualization and CFD studies of multiphase flows. In this study, a numerical analysis was conducted on the dynamics of a rising bubble within such a setup, indicating that the shape and motion of the bubble are influenced by the gap size and Reynolds number. Increasing Reynolds number results in a more elongated oblate spheroidal shape and predominantly rectilinear rise behavior of the bubble.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Engineering, Chemical
Biao Sun, Tejas Bhatelia, Ranjeet P. Utikar, Geoffrey M. Evans, Vishnu K. Pareek
Summary: This study investigates the hydrodynamic performance of two structured packings and compares 3D-printed packing replicas with commercial packings. The results show that the 3D-printed replicas perform consistently well and provide more advantages in measuring liquid distribution.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2021)
Article
Engineering, Chemical
Yuxiu Li, Shashank S. Tiwari, Geoffrey M. Evans, Krishnaswamy Nandakumar, Jyeshtharaj B. Joshi
Summary: Direct Numerical Simulations (DNS) using a non-Lagrangian multiplier based fictitious domain (FD) method were conducted to study the behavior of freely falling/rising rigid particles in a quiescent fluid. The simulations validated well against experimental results and identified several distinct flow regimes, including helical and zig-zagging trajectories for different solid-to-fluid density ratios. Fast Fourier Transform (FFT) analysis revealed a bimodal frequency pattern similar to flow past an isolated stationary bluff body.
INTERNATIONAL JOURNAL OF CHEMICAL REACTOR ENGINEERING
(2021)
Article
Chemistry, Multidisciplinary
Masud Hassan, Yanju Liu, Ravi Naidu, Jianhua Du, Fangjie Qi, Scott W. Donne, Md Monirul Islam
Summary: The study synthesized HNT-BC@Alg composite adsorbents for the removal of heavy-metal ions in water, showing good adsorption performance and rapid adsorption kinetics, with high removal efficiency observed in a mesoporous structure rich in functional groups. The removal of heavy-metal ions is significantly influenced by siloxane groups, oxygen-containing functional groups, as well as hydroxyl and carboxyl groups in the adsorbent.
Article
Electrochemistry
Sofia B. Davey, Amanda P. Cameron, Kenneth G. Latham, Scott W. Donne
Summary: This study examined the electrified interface between a planar non-porous glassy carbon electrode and a 0.5 M Na2SO4 aqueous electrolyte using SPECS and EIS techniques, providing insights into the variation of capacitance across the potential window and the role of EIS frequency in determining capacitance. The results highlighted the impact of mass transport on the amount of charge storage at the interface, showing the dynamics of interface formation and structure.
ELECTROCHIMICA ACTA
(2021)
Article
Electrochemistry
Amanda P. Cameron, Sofia B. Davey, Kenneth G. Latham, Scott W. Donne
Summary: It was found that the capacitance of the GCE in 1 M TEABF(4) in acetonitrile was significantly higher compared to that in 0.5 M Na2SO4, primarily due to the solvation of adsorbing electrolyte ions.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2021)
Article
Electrochemistry
Amanda P. Cameron, Sofia B. Davey, Caitlin L. Callahan, Scott W. Donne
Summary: This study provides insights into the structure and behavior of the electrified interface between a planar non-porous glassy carbon electrode and a 0.5 M Na2SO4 aqueous solution. By using a rotating glassy carbon disk electrode, it is observed that increasing rotation rates lead to decreasing boundary layer thicknesses and interfacial capacitance. This suggests that electrolyte counter charge extends significantly into the electrolyte due to the dissipation of counter charge through convective flow outside the macroscopically thick boundary layer.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2022)
Article
Thermodynamics
Mohammad Mainul Hoque, Roberto Moreno-Atanasio, Elham Doroodchi, J. B. Joshi, Geoffrey M. Evans, Subhasish Mitra
Summary: This study experimentally analyzed the flow field around single bubbles of different diameters and investigated the impact of bubble size on kinetic energy distribution. The energy spectrum of the large-scale motions depended on bubble size, while the small-scale spectrum was independent of it. The transition of slope at the bubble diameter wavenumber was observed as a key feature in the study.
EXPERIMENTAL THERMAL AND FLUID SCIENCE
(2022)
Article
Engineering, Chemical
Mohammad Mainul Hoque, E. Doroodchi, G. J. Jameson, G. M. Evans, Subhasish Mitra
Summary: This study investigates the interaction between turbulent flow structures and bubble-particle aggregates in flotation. The results show that by varying the channel Reynolds number, the bubble-particle aggregates can be captured by the vortex, leading to particle detachment. A criterion for particle detachment is determined using predicted vorticity and local energy dissipation rate from the CFD model.
MINERALS ENGINEERING
(2022)
Article
Materials Science, Multidisciplinary
Thi Bang Tuyen Nguyen, Subhasish Mitra, Geoffrey M. Evans, Hamid Doostmohammadi, Brian J. Monaghan, Paul Zulli, Kyoung-oh Jang, Damien O'Dea, Tom Honeyands
Summary: This study used computational fluid dynamics to investigate the segregation behavior of phosphorus rich and iron rich phases in steelmaking slag, and proposed a suitable separation practice for the phosphorus rich phase. Crucible experiments and CFD simulations were conducted to verify the concentration difference between the two phases, and the simulations were scaled up to industrial-scale equipment for verification.
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
(2022)
Article
Engineering, Chemical
Jikang Han, Taishan Liu, Yanfeng Li, Peng Chen, Mao Yin, Mengqi Ma, Geoffrey M. Evans
Summary: The study focuses on the bed fluid hydrodynamic parameters of the new three-phase fluidized bed flotation column (TFC). The hydrodynamics characteristics, such as gas holdup, bubble diameter, and bubble surface area flux, have been investigated. The effects of system parameters on the bed hydrodynamic characteristics of the TFC have been studied. Mathematical models have been developed to predict the hydrodynamic parameters and bubble diameter of the TFC, and the experimental results agree well with the predicted values.
MINERALS ENGINEERING
(2022)
Article
Electrochemistry
Thibaud Guillemin, Camille Douard, Anthony Impellizzeri, Christopher P. Ewels, Bernard Humbert, Christophe Lethien, Scott W. Donne, Jean Le Bideau, Thierry Brousse
Summary: We investigated the contribution of pseudocapacitance to the overall capacitance of MnO2 electrodes in pure and alkaline-doped ionic liquids using step potential electrochemical spectroscopy (SPECS) and in situ Raman spectroscopy. Pseudocapacitive charge storage accounted for over half of the total capacitance with alkaline-doped ionic liquids. In situ Raman spectroscopy provided insight into the reversible ion intercalation in the MnO2 structure.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2023)
Review
Engineering, Chemical
Mohammad Mainul Hoque, Jyeshtharaj B. Joshi, Geoffrey M. Evans, Subhasish Mitra
Summary: In multiphase particulate systems, the turbulence of the continuous phase is influenced by interactions with the suspended particles, which can either enhance or reduce the existing flow patterns. This study comprehensively analyzes this aspect based on experimental data from various turbulent flow systems. Non-dimensional parameters such as particle diameter, Stokes number, particle volume fraction, particle momentum number, and particle Reynolds number are used to characterize the turbulence modulation behavior. The limitations of commonly used dimensionless parameters for characterizing turbulence modulation are discussed and possible improvements are suggested.
REVIEWS IN CHEMICAL ENGINEERING
(2023)
Article
Political Science
Peter Egge Langsaether, Geoffrey Evans, Tom O'Grady
Summary: Past findings on class position and political preferences have been mostly based on cross-sectional studies, which do not provide a strong basis for inferring causality. This study uses long-term panel data on British respondents to examine the impact of intra-generational class mobility on political identities and preferences. The results show that upward class mobility leads to small increases in economic conservatism, but does not significantly affect party choice, class identity, or attitudes towards non-economic issues. This suggests that the short-term effects of class mobility primarily operate through an economic self-interest mechanism, while beliefs unrelated to economics remain unaffected. The overall association between class and various identities, opinions, and preferences is therefore more likely to be shaped by early life experiences and long-term socialization than immediate material interests associated with jobs.
BRITISH JOURNAL OF POLITICAL SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
Kenneth G. Latham, Marveh Forghani, Wesley M. Dose, Jessica A. Allen, Scott W. Donne
Summary: This study explored the influence of four different attached counter ions on the physicochemical properties and electrochemical performance of carbon structures nitrogen-doped via hydrothermal carbonization of ammonium. The results showed significant differences in nitrogen incorporation levels, physicochemical properties, and supercapacitor performance among the different counter ions. The findings suggest that the choice of counter ion can play a crucial role in tailoring the properties of the resulting material.
MATERIALS ADVANCES
(2021)
Article
Engineering, Chemical
Yongxiang Wu, Nguyen Thi Hong Nhung, Deqian Zeng, Nengneng Luo, Akira Otsuki, Gjergj Dodbiba, Toyohisa Fujita
Summary: This study proposed a novel method for synthesizing flower-like vaterite calcium carbonate using nanobubble-containing ethanol and water mixed solution as the solvent and discussed the formation mechanism of vaterite with different shapes. The synthesized vaterite has significant practical interest in the integrated treatment of wastewater contaminated by heavy metals with effective Cd(II) removal, providing a promising field for studying heavy metal and pollutant adsorption in the liquid phase.
ADVANCED POWDER TECHNOLOGY
(2024)
Article
Engineering, Chemical
Jian Gong, Lipo Cheng, Ming Liu, Jie Jiang, Xiaoduo Ou
Summary: This study investigates the effects of particle shape on the collapse of granular columns using the discrete element method. The results show that particle shape has a significant impact on deposition morphology, energy evolution, and mechanical coordination number. Sphericity and angularity are identified as the most important macroscale factors, while roughness has a weaker microscale influence.
ADVANCED POWDER TECHNOLOGY
(2024)
