Article
Engineering, Chemical
Kaiwu Huang, Serhat Keles, Ian Sherrell, Aaron Noble, Roe-Hoan Yoon
Summary: This study considers flotation as hetero-coagulation and models the bubble-particle interactions using the hydrophobic force as a kinetic parameter. By combining the pulp-phase model with a froth-phase model, a flotation simulator has been developed for constructing grade vs. recovery curves.
MINERALS ENGINEERING
(2022)
Article
Engineering, Chemical
Shihao Ding, Kang Yu, Qi He, Qinglin Yin, Xin Feng, Yumei Yong, Chao Yang, Yijun Cao, Xiahui Gui, Yaowen Xing
Summary: This study investigated the detachment of bubble-particle aggregates in both tangential and vertical directions using experimental and numerical simulation methods. Results indicate that the stability of bubble-particle aggregates is significantly lower in the tangential direction than in the vertical direction, making them more prone to detachment in the tangential direction during flotation. The detachment process can be divided into three stages: bubble stretching, bubble sliding, and bubble necking.
Article
Engineering, Chemical
Liang Zhao, Li Zhuang, Zhijun Zhang
Summary: Contact angle is an important parameter for the hydrophobicity of solid surfaces, and it is widely used in assessing the wetting and floatability of mineral particles. A composite method combining image processing analysis and force balance calculation was proposed to directly measure the contact angle of particles. The accuracy and convenience of this method were confirmed through experiments showing good agreement between observed and calculated contact angles. The effects of particle size, hydrophobized time, and bubble size on the contact angle distribution were investigated using hydrophobized glass beads.
MINERALS ENGINEERING
(2023)
Article
Construction & Building Technology
Jiayun Xu, Biao Ma, Shulin Zhou, Weijie Mao, Xiaoqing Wang
Summary: Based on the Wenzel model and Cassie model, this paper established a new wetting model for irregular rough surfaces and calculated the wetting depth and apparent contact angle. The experimental results showed significant differences in the surface texture parameters of different aggregates. The relative error between the predicted and measured contact angles was less than 15%, indicating excellent prediction effect. The wetting model analysis revealed that the surface tension of the test liquid, lithology of the solid aggregate, surface roughness, and texture structure are important control parameters affecting wetting.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Chemistry, Physical
P. Xu, J. R. Bai, P. Zhou, L. L. Wang, X. N. Sun, L. Wei, Q. F. Zhou
Summary: A physical model was proposed to investigate the wettability of various microtextured surfaces, particularly superhydrophobicity. It was found that the sidewall angle restricted the contact angle of the microstructures, and re-entrant structures played a crucial role in the transition from hydrophilicity to superhydrophobicity.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2022)
Article
Chemistry, Multidisciplinary
Matti J. Hokkanen, Matilda Backholm, Maja Vuckovac, Quan Zhou, Robin H. A. Ras
Summary: Superhydrophobic coatings with unique properties such as self-cleaning and staying dry have recently emerged in industrial and consumer markets. The stochastic nature of coating components can affect the uniformity of water repellency, and traditional contact angle goniometry may not provide accurate quantification of wetting properties. The study demonstrates that highly sensitive force-based methods can offer advantages in quantifying microscale heterogeneity in superhydrophobic coatings.
ADVANCED MATERIALS
(2021)
Article
Thermodynamics
Sanjivan Manoharan, Raj M. Manglik, Milind A. Jog
Summary: An experimental study was conducted on bubble growth from submerged orifice plates in pools of water to analyze the effects of surface wettability and orifice diameter D-0. The results showed that bubble growth is influenced by surface wettability, with the bubble base spreading on the surface and resulting in a larger departure diameter when the contact angle is above a critical value. The study also introduced a modified capillary length to scale and correlate the wettability effects.
JOURNAL OF HEAT TRANSFER-TRANSACTIONS OF THE ASME
(2021)
Article
Mechanics
Alen Pavlic, Cooper Lars Harshbarger, Luca Rosenthaler, Jess Gerrit Snedeker, Juerg Dual
Summary: This study presents a technique utilizing acoustically excited sharp edges to generate strong mixing flow in a microfluidic chip. The chip is capable of precise manipulation of fluids and objects on the microscale, making it crucial for various applications in life sciences and chemical engineering.
Article
Chemistry, Physical
Lanlan Xiao, Kaixuan Zhang, Jiayi Zhao, Shuo Chen, Yang Liu
Summary: In this paper, the viscosity of a many-body dissipative particle dynamics (MDPD) model was measured using the Poiseuille flow method and the Couette flow method. The results obtained from these two non-equilibrium methods were consistent. A viscosity map for the MDPD model with different numerical parameters was obtained using the Poiseuille flow method, and the static wetting of microbubbles was investigated based on the map. The relationship between the contact angle of bubbles and the solid-liquid interaction was determined, providing insights for further microfluidic research and applications involving micro bubbles.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2021)
Article
Chemistry, Physical
G. C. Savulescu, M. Rucker, A. Scanziani, R. Pini, A. Georgiadis, P. F. Luckham
Summary: This study investigates the potential of using atomic force microscopy to characterize wetting behavior at the nanoscale, successfully observing an attraction phenomenon on the water droplet surface in experiments and obtaining parameters such as contact angle and contact angle distribution.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2021)
Article
Mechanics
D. Ding, J. B. Bostwick
Summary: We study the linear stability of a compressible sessile bubble on a partially wetting planar solid support, and report two instability modes related to volume change and the horizontal center-of-mass motion of the bubble. The respective instability mechanisms are revealed through an energy analysis. We also show a complex dependence between classical volume and shape change modes for wetting conditions that differ from neutral wetting.
JOURNAL OF FLUID MECHANICS
(2022)
Article
Chemistry, Physical
Alexander K. Shchekin, Liubov A. Gosteva, Dmitry V. Tatyanenko
Summary: Classical square-gradient density functional theory was used to describe the disjoining pressure in vapor layers, revealing that the pressure tensor is significantly anisotropic in the vapor layers near the smooth solid surfaces. Comparison of mechanical and thermodynamic definitions of the disjoining pressure in the spherical vapor layer showed consistency.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2021)
Article
Metallurgy & Metallurgical Engineering
Ai Chun-ming, Sun Ping-ping, Wu Ai-xiang, Chen Xun, Liu Chao
Summary: This study investigates the potential effect of surfactant on improving the surface wettability of copper ore through experimental and numerical analysis. The results show that the concentration of surfactant and sulfuric acid solution play a significant role in enhancing the wettability of the ore. Liquid surface tension and ore surface roughness are identified as the key factors affecting the surface wettability.
JOURNAL OF CENTRAL SOUTH UNIVERSITY
(2022)
Article
Chemistry, Multidisciplinary
Charles W. Extrand
Summary: This theoretical work analyzes the energy distribution associated with the formation of a meniscus in a small diameter capillary tube. Equations for work of wetting, surface energy, gravitational energy, and dissipation are derived. The study finds that meniscus formation is energetically distinct and more complex than capillary rise, with most of the energy stored in the stretched air-liquid interface or dissipated in the bulk liquid.
Article
Chemistry, Physical
Yangyang Wu, Konstantinos Lazaridis, Mikhail D. Krivilyov, Sinisa Dj. Mesarovic, Dusan P. Sekulic
Summary: Understanding the effect of gravity on the capillary flow of molten metal is crucial for repair and construction in space through brazing. Our experiments demonstrate the formation of a secondary liquid flux meniscus in contact between liquid Al-Si and an alumina substrate. The equilibrium contact angle is close to 180 degrees, while the apparent contact angle depends on the brazing liquid mass. Additionally, the surface profile of the molten braze alloy on inclined AA3003 changes from a non-symmetric shape to a more symmetric shape as the inclination angle decreases.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2023)
Article
Engineering, Chemical
Roe-Hoan Yoon, Gaurav Soni, Kaiwu Huang, Seungwoo Park, Lei Pan
INTERNATIONAL JOURNAL OF MINERAL PROCESSING
(2016)
Article
Engineering, Chemical
Kaiwu Huang, Lei Pan, Roe-Hoan Yoon
MINERALS ENGINEERING
(2018)
Article
Engineering, Chemical
Seungwoo Park, Kaiwu Huang, Roe-Hoan Yoon
MINERALS ENGINEERING
(2018)
Article
Chemistry, Multidisciplinary
Kaiwu Huang, Roe-Hoan Yoon
Proceedings Paper
Engineering, Manufacturing
Xie Weiwei, He Xiaowei, Huang Kaiwu, Zhang Yuran, Liu Congkun
ADVANCED DESIGN TECHNOLOGY
(2012)
Proceedings Paper
Energy & Fuels
Xie Weiwei, Huang Kaiwu, Wang Donghui, Zhang Yuran, Liu Xiu
2011 2ND INTERNATIONAL CONFERENCE ON ADVANCES IN ENERGY ENGINEERING (ICAEE)
(2012)
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)