Review
Geochemistry & Geophysics
Ning Yao, Jingting Liu, Xun Sun, Yan Liu, Songying Chen, Guichao Wang
Summary: This paper focuses on the effects of turbulence on the interactions between particles and bubbles in froth flotation processes, highlighting that turbulence can affect flotation performance in a complex way. Understanding turbulence effects is crucial for optimizing flotation processes through equipment structure or operating parameter adjustments.
Article
Acoustics
Darja Horvat, Vid Agrez, Tomaz Pozar, Bojan Starman, Miroslav Halilovic, Rok Petkovsek
Summary: This study investigated the generation of secondary cavitation following laser-induced breakdown in spherical media. Through numerical simulation and experimental comparison, it was found that significant transient negative pressure and pre-illumination by breakdown-generating laser pulses played important roles in the generation of secondary cavitation.
ULTRASONICS SONOCHEMISTRY
(2022)
Article
Energy & Fuels
Fangyuan Ma, Dongping Tao, Youjun Tao
Summary: The effects of nanobubbles on fine coal column flotation and the underlying mechanisms were investigated. The use of nanobubbles significantly improved the efficiency of column flotation for fine coal particles. Nanobubbles acted as a secondary collector, resulting in a decrease in collector dosage, and their unique generation mechanisms led to a reduction in frother dosage and required air dosage.
INTERNATIONAL JOURNAL OF COAL PREPARATION AND UTILIZATION
(2022)
Review
Geochemistry & Geophysics
Sabereh Nazari, Ahmad Hassanzadeh, Yaqun He, Hamid Khoshdast, Przemyslaw B. Kowalczuk
Summary: This paper reviews recent developments in the understanding and application of ultrafine bubbles in flotation, focusing on the generation and detection methods as well as the types of reagents used. The limitations and opportunities of detecting ultrafine bubbles are comprehensively reviewed. The effectiveness of flotation-assisted nano-bubbles for mineral recovery is highlighted, but the accurate measurement of their size distribution and commonly used reagents remains a challenge. The study also identifies the most predominant methods for generating and detecting ultrafine bubbles and suggests future directions for research.
Article
Engineering, Chemical
You Zhou, Boris Albijanic, Rasoul Panjipour, Yuling Wang, Jianguo Yang
Summary: Understanding and predicting attachment efficiency (P-a) and induction time (ti) are crucial for optimizing flotation circuits. Experimentally determined P-a is more sensitive to changes in experimental conditions compared to ti and flotation rate constant (k).
ADVANCED POWDER TECHNOLOGY
(2021)
Article
Green & Sustainable Science & Technology
Guangxi Ma, Xiangning Bu, Ugur Ulusoy, Guangyuan Xie
Summary: This study investigates the role of particle shape in their adhesion to air bubbles during flotation. The results show that cubic particles have the highest attachment efficiency, while spherical particles have the lowest. The study also highlights the importance of particle edges and vertices in improving attachment efficiency. These findings provide important insights for selecting and controlling particle shape in the flotation process.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Chemistry, Physical
Bichitra Nanda Sahoo, Nagendra Prasad Yerriboina, Bong-kyun Kang, Andreas Klipp, Tae-Gon Kim, Jin-Goo Park
Summary: The ultrasonic cleaning method has become increasingly popular for removing contaminated particles from semiconductor devices. This study investigates the influence of surfactant and dissolved gas on the dynamics of cavitation bubbles at different ultrasonic powers and proposes a mechanism for the removal of PSL particles.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2023)
Article
Engineering, Chemical
Z. Pourkarimi, B. Rezai, M. Noaparast, A. Nguyen, S. Chehreh Chelgani
Summary: The study demonstrated that nanobubbles can selectively attach to the surface of target minerals, improving their flotation recovery and grade. In the presence of nanobubbles, the adsorption of flotation collector decreased, and there was a change in particle surface potential.
ADVANCED POWDER TECHNOLOGY
(2021)
Article
Engineering, Chemical
Joe Z. Zhou
Summary: The study observed that salts had a significant impact on dynamic bubble nucleation on hydrophobic surfaces in air-supersaturated water, with low salt concentrations resulting in similar bubble sizes and high salt concentrations leading to significantly smaller bubbles covering the surface.
CANADIAN JOURNAL OF CHEMICAL ENGINEERING
(2021)
Article
Engineering, Chemical
Yawen Gao, Amir Motamed Dashliborun, Joe Z. Zhou, Xuehua Zhang
Summary: This study compares the effects of temperature and air suction on the formation and stability of microbubbles in water from municipal tap and oilsands industry process water, finding significant differences in microbubble generation between the two types of water under different conditions.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2021)
Article
Engineering, Environmental
Lixue Liu, Chaoqun Yao, Shuainan Zhao, Zhikai Liu, Guangwen Chen
Summary: An approach that combines power ultrasound and microchannel to enhance the mixing of miscible fluid in antisolvent processes is proposed. The evolution and oscillation of cavitation microbubbles during ultrasound actuation, facilitated by antisolvent processes, lead to easier initiation of transient cavitation compared to pure liquids. Interaction among microbubbles results in two distinct group patterns, namely bubble array and bubble cluster, significantly impacting mixing. Both patterns increase mixing efficiency by at least one order of magnitude compared to microfluidic devices and previously-studied ultrasonic microreactors. The approach generates high-quality mini-emulsions with a unimodal size range of 180-290 nm for the model system (acetone-soybean oil-water).
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Acoustics
Hao Wu, Hao Zheng, Yuanyuan Li, Claus-Dieter Ohl, Haixia Yu, Dachao Li
Summary: This study investigates the effect of liquid surface tension on the dynamics of acoustic cavitation bubbles, revealing that low surface tension reduces bubble stability, leading to earlier collapse and farther distance from a rigid wall. Additionally, surface tension influences micro-jet speeds, highlighting the role of surfactants in optimizing acoustic cavitation.
ULTRASONICS SONOCHEMISTRY
(2021)
Article
Engineering, Chemical
T. Uysal, O. Guven, O. Ozdemir, I. E. Karaagaclioglu, B. Tunc, M. S. Celik
Summary: The study introduces a new approach to correlate the aggregation and flotation of sphalerite mineral with morphological variations. Adjusting the morphology of sulfide particles enhances particle-particle interactions, improves bubble-particle interactions, and facilitates the flotation process.
MINERALS ENGINEERING
(2021)
Review
Metallurgy & Metallurgical Engineering
Liang Zhao, Joe Zhou, Zhi-jun Zhang, Qing-xia Liu
Summary: Understanding the role of surface roughness in flotation is crucial for achieving the highest technical and economical efficiencies. However, there are gaps between current research in ideal bubble-particle interaction dynamics and the real mineral particles in flotation. Future research needs to develop suitable techniques to quantify the surface roughness of real mineral solids and correlate the dynamics of ideal bubble-particle interactions with real mineral particles.
JOURNAL OF CENTRAL SOUTH UNIVERSITY
(2023)
Article
Engineering, Chemical
Ai Wang, Mohammad Mainul Hoque, Geoffrey Evans, Subhasish Mitra
Summary: This study numerically computed the collision efficiency in a multi-bubble-particle system and investigated the effects of solids concentration and turbulence intensity. The results showed that in a monolayer configuration, side-by-side collisions did not occur, while in a multilayer configuration, particles had a chance to collide with trailing bubbles, resulting in higher collision efficiency. The modeling results also demonstrated that the energy dissipation rate increased with the number of bubbles per layer, number of bubble layers, turbulence intensity, and solids concentration.
MINERALS ENGINEERING
(2022)
Article
Energy & Fuels
Ngoc N. Nguyen, Vinh T. La, Chinh D. Huynh, Anh Nguyen
Summary: Carbon capture and storage (CCS) is crucial for reducing CO2 emissions and achieving climate change targets. Hydrate-based carbon capture (HBCC) is a promising and potentially competitive method, but slow kinetics and limited industrial experience present challenges for deployment.
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
Chemistry, Physical
Kangkang Sun, Cuong V Nguyen, Ngoc N Nguyen, Anh V Nguyen
Summary: This article provides a comprehensive review of the flotation separation of water-soluble salt minerals, summarizing the agreement and disagreement between experimental results and theories. The results show that the flotation of salt is strongly influenced by collectors, brine ion composition, and pH conditions, and there are some exceptional results that cannot be explained by crystal surface charge and wettability. The authors suggest that the interactions between salt ions, water molecules, collectors, and salt crystals should be considered more thoroughly, with a focus on the activity of collectors at the air-liquid interface.
ADVANCES IN COLLOID AND INTERFACE SCIENCE
(2022)
Review
Chemistry, Physical
Xiaozhen Ma, Ngoc N. Nguyen, Anh V. Nguyen
Summary: This paper provides a critical review of the experimental and theoretical investigations of the particle floatability and stability of the particle-laden interfaces. The study analyzed asymptotic solutions of the Young-Laplace equation for various particle configurations and assessed the outcomes of both theoretical and experimental studies of the particle-laden interface stability.
ADVANCES IN COLLOID AND INTERFACE SCIENCE
(2022)
Article
Chemistry, Physical
Foad Raji, Ngoc N. Nguyen, Cuong V. Nguyen, Tuan A. H. Nguyen, Anh Nguyen
Summary: Responsive silica surfaces have smart applications in catalysis, mass transfer, and self-cleaning. This study reveals the unexpected hydrophobization of silica surfaces in a lead nitrate solution and explains it through the pH response. The observed intensity minima in the pH-dependent sum frequency generation spectra and the presence of hydrophobic-like stretching modes of interfacial water serve as a molecular fingerprint of the hydrophobicity of silica surfaces, which is confirmed by contact angle measurements.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Physical
Kangkang Sun, Cuong V. Nguyen, Ngoc N. Nguyen, Xiaozhen Ma, Anh V. Nguyen
Summary: Flotation of water-soluble KCl and NaCl minerals in brines is significant for K-fertilizer production, but its mechanism remains controversial. This study investigates the interaction between dissolved salt ions and collector colloids, as well as the changes in interfacial properties, to gain a molecular understanding of salt flotation. The findings suggest that ion specificity plays a crucial role in salt crystal flotation via collector colloid-crystal attraction.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Chemistry, Physical
Thao T. P. Nguyen, Foad Raji, Cuong V. Nguyen, Ngoc N. Nguyen, Anh V. Nguyen
Summary: Surfactants play a crucial role in controlling the macroscopic properties of the air-water interface. This study investigates the connection between the molecular structure of two ionic surfactants (DTAB and SDS) and their effects on the interfacial water molecules. The findings reveal that the different interactions and reorientations of water molecules result in variations in interfacial layer thickness, surface tension, and foam stability.
Article
Engineering, Chemical
Tariqul Islam, Anh Nguyen
Summary: Fluidization is effective in improving the separation of coarse particles. In this study, three-dimensional computational fluid dynamics (CFD) modeling is used to investigate the complex behavior of irregular coarse particle fluidization in a fluidized bed flotation cell. A modified drag model considering the particle shape factor is employed to account for the irregularity of the particles. Comparison between simulated and experimental data shows that the irregular particle drag model has a relative error of 3.9%, which is significantly better than the spherical particle drag model. The CFD model further reveals the effects of particle density and fluidization liquid velocity on bed expansion height. The fluidization behaviors of the particles in different zones of the fluidized bed flotation cell are analyzed, providing valuable insights for the flotation of coarse particles in fluidized beds.
MINERALS ENGINEERING
(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
Engineering, Environmental
Foad Raji, Cuong V. Nguyen, Anh V. Nguyen
Summary: A new model was proposed in this study to accurately describe the adsorption of heavy metal ions on quartz surfaces and explain the surface charge reversal phenomenon. The model combines the electrical double layer theory and surface complexation and precipitation theory, and can predict the surface potential and charge reversal under different conditions. By studying the Pb(II)-quartz system, it was found that Pb(II) hydroxocomplexes played a key role in the appearance of the second surface charge reversal.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Engineering, Chemical
Benjamin De Castro, Mostafa Benzaazoua, Soumali Roychowdhury, Aurelie Chopard, Francis Quintal Lauzon, Benoit Plante
Summary: This study proposes an innovative method using deep learning algorithm and reflected light optical imaging to automatically detect all particles and minerals in acrylic resin polished sections. The experimental results show that this method can accurately detect all mineral particles, including transparent minerals, under reflected light optical microscopy, and provide unbiased mineralogical quantification.
MINERALS ENGINEERING
(2024)
Article
Engineering, Chemical
Qiushi Song, Xinyu Du, Changlu Shan, Hongwei Xie, Zhiqiang Ning, Kai Yu
Summary: This study investigated the effect of magnetic stirring on the microstructure of Co deposits during electrowinning in a chloride solution. It was found that magnetic stirring effectively reduced the negative influence of H2 bubbles on the structure of Co deposits and changed their nucleation and growth behavior, resulting in the preparation of high-quality columnar Co crystals.
MINERALS ENGINEERING
(2024)
Article
Engineering, Chemical
Tao Ge, Xiaowei Zhou, Liang Xu, Yan Sun, Cheng Yang, Yongpan Tian, Zhuo Zhao
Summary: In this study, the extraction performance and complexation mechanism of p-di-ethyl-amino-methylthiacalix[4]arene (L) towards Pt(IV) were investigated. The results indicated that L had excellent complexation ability towards Pt(IV) and could selectively extract it from a solution containing multiple competing ions.
MINERALS ENGINEERING
(2024)
Article
Engineering, Chemical
Yuan Li, Dirk van Zyl
Summary: This paper presents a modified Kynch's approach to explain the hindered settling behavior of suspensions impacted by segregation. The experimental data and predicted results confirm the effectiveness of the proposed method.
MINERALS ENGINEERING
(2024)
Article
Engineering, Chemical
Yi Fang, Aurora Robledo-Cabrera, Changsheng Peng, Shan Huang, Qi Xiao, Alejandro Lopez-Valdivieso
Summary: With the assistance of mechanical ball milling, the partially oxidized micro-sponge iron (micro-Fe0@Fe2O3) achieves significantly improved removal of Cr(VI) across a broad pH range. Mechanical force eliminates the surface oxide layer and exposes the Fe0 core, leading to sustained reduction of Cr(VI). The efficiency of micro-Fe0@Fe2O3 is strongly influenced by dissolved oxygen, with higher DO resulting in the generation of stable reductant Fe(II) under acidic conditions, while DO consumption hinders the reduction of Cr(VI) under alkaline conditions due to increased pH. Parameters of ball milling operation, especially rotation speed, have a significant impact on the removal of Cr(VI).
MINERALS ENGINEERING
(2024)
Article
Engineering, Chemical
Alton F. Grabsch, Phillip D. Fawell, Michael G. Davies
Summary: High molecular weight partially hydrolysed polyacrylamide (PHPA) is commonly used in mineral exploration drilling to increase fluid viscosity and help maintain the suspension of fine particles. However, clarifying these suspensions can be difficult, and previous studies have found that anionic flocculants are ineffective. This study confirmed that nonionic flocculants can successfully aggregate the particles, indicating that the charged tails of adsorbed PHPA prevent anionic flocculants from accessing the particle surfaces.
MINERALS ENGINEERING
(2024)
Article
Engineering, Chemical
J. S. Guiral-Vega, L. Perez-Barnuevo, J. Bouchard, A. Ure, E. Poulin, C. Du Breuil
Summary: This paper introduces an approach that combines particle properties and process modeling to describe the behavior of iron ore in a laboratory-scale drum-type magnetic separator. Early information on iron ore processing behavior can be obtained through laboratory testing, automated mineralogy analysis, and process modeling.
MINERALS ENGINEERING
(2024)
Review
Engineering, Chemical
Sayed Janishar Anzoom, Ghislain Bournival, Seher Ata
Summary: This review discusses the benefits and challenges of coarse particle flotation, as well as recent developments in improving the process. Coarse particle flotation has various applications and offers advantages in technical, economic, and sustainability aspects. However, it also faces challenges such as particle detachment, transfer between phases, and persistence in the froth phase. Technological advancements, such as fluidized-bed flotation and processes enhancing bubble-particle attachment, have shown promising results in efficiently recovering larger particles.
MINERALS ENGINEERING
(2024)
Article
Engineering, Chemical
Yimei Xiao, Jinchan Feng, Bingqiao Yang, Huihua Luo, Fang Zhou
Summary: In this study, the use of fulvic acid as a depressant for the flotation separation of chalcopyrite from arsenopyrite was investigated. It was found that fulvic acid strongly depressed arsenopyrite while having little influence on chalcopyrite flotation. The addition of calcium hypochlorite facilitated the adsorption of fulvic acid on arsenopyrite surface.
MINERALS ENGINEERING
(2024)
Article
Engineering, Chemical
Bo Hao, Minqiang Fan
Summary: Particle-bubble attachment is crucial in coal and mineral flotation processes. In this study, the attachment process of low-rank coal particles to the bubble surface was simulated, revealing the important role of water film rupture in particle attachment.
MINERALS ENGINEERING
(2024)
Article
Engineering, Chemical
Shuwei Wu, Shuai Wang, Guoqiang Wang, Longfei Fan, Jianbo Guo, Zhengbin Liu, Haoyan Zhang, Wei Guan, Yukuan Wang, Yewei Wu
Summary: This study analyzes the motion mode of eccentric roller crushers and proposes a calculation method for productivity. Through laboratory experiments, the results indicate that the proposed method can effectively estimate the productivity of eccentric roll crushers.
MINERALS ENGINEERING
(2024)
Article
Engineering, Chemical
Hanna Miettinen, Malin Bomberg, Ozlem Bicak, Zafir Ekmekci, Paivi Kinnunen
Summary: Mineral processing requires large amounts of water, and reducing water consumption through recirculation and closing water loops is important. However, this can lead to the accumulation of contaminants in the process water, which can negatively affect the process performance. In this study, the impact of microorganisms on flotation performance was investigated, and ion exchange was evaluated for removing dissolved sulfur species and microorganisms from water. The results showed that adding microorganisms had a positive effect on flotation selectivity, especially for nickel. Different water types, process water and final tailings water, behaved slightly differently. Ion exchange proved to be effective in removing sulfur species and microorganisms, and dissolved air flotation was a successful pretreatment for ion exchange in removing microorganisms.
MINERALS ENGINEERING
(2024)
Article
Engineering, Chemical
Canneng Chen, Song Zhang, Quanjun Liu, Luzheng Chen, Yongjun Xian, Yijie Wang
Summary: This study introduces the use of ultrasonic pretreatment to enhance the flotation separation of elemental sulfur and silver-bearing lead minerals from ultrafine residue. The results show that ultrasonic pretreatment effectively liberates associated sulfur and improves the separation of sulfur and silver-bearing lead minerals. Under optimized conditions, ultrasonic pretreatment significantly improves the recovery and grade of sulfur in the concentrate, as well as the recovery of lead and silver in the tailings.
MINERALS ENGINEERING
(2024)
Article
Engineering, Chemical
Genzhuang Li, Fisher Wang, Bern Klein, Michael Deal, Aaron Wright, Hector Mezquita
Summary: This paper presents a stress-based approach for predicting and improving large-scale HIG mill performance through experimental testing and model calibration.
MINERALS ENGINEERING
(2024)
Article
Engineering, Chemical
Runpeng Liao, Shuming Wen, Jian Liu, Shaojun Bai, Qicheng Feng
Summary: This study demonstrates that the use of a DDA/DDTC mixed collector system can significantly improve the flotation performance of smithsonite. The synergistic effect between DDA and DDTC is confirmed, and the mixed collector system contributes to a decrease in solution surface tension. The use of FT-IR and XPS confirms the simultaneous physisorption and chemisorption of DDA and DDTC on the smithsonite surface, and contact angle measurements show that the mixed collector effectively enhances the hydrophobicity of smithsonite. Molecular dynamics simulations reveal the multilayer adsorption of DDTC and DDA on the smithsonite surface, with DDTC promoting the adsorption of DDA.
MINERALS ENGINEERING
(2024)