Article
Environmental Sciences
Qian Zhang, Jinwen Zhou, Lishan Zhang, Shan Zhong, Xuan Ru, Xiaohua Shu
Summary: This study explores the adsorption of tylosin on natural pyrite, considering solution chemistry and dissolved organic matter in lake water. The results show that active sites on pyrite, such as sulfur defects and Fe(III)/Fe(II), significantly influence the adsorption of tylosin. Factors like pH and phosphate ions also play a role in regulating the adsorption. This research provides insights into the interaction between antibiotics and pyrite in the environment.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Engineering, Chemical
Hang Wang, Chaoshui Xu, Peter A. Dowd
Summary: This study presents a 3D numerical modelling method to predict the pyrite oxidation level in refractory gold-bearing stockpiles, taking into account factors such as oxygen concentration, water saturation, temperature, and pH. Simulation results show that after ten years, the pyrite oxidation level can reach up to 50%, depending on stockpile properties. The model can simulate the overall oxidation level and the oxidation depth of pyrite grains of different sizes at different locations.
MINERALS ENGINEERING
(2021)
Article
Chemistry, Multidisciplinary
Qihao Gui, Shixing Wang, Libo Zhang
Summary: The research discusses the impact of ultrasonic cavitation on the oxidation process of crystal pyrite in deionized water. It indicates that higher alkalinity, ultrasonic power, and temperature lead to more severe surface corrosion of pyrite, causing sulfur to be oxidized into S2O32- and SO42-. Additionally, the concentration of Fe(II) in solution decreases with the increase of NaOH concentration, while the deposition of iron oxides on the pyrite surface helps prevent pyrite oxidation.
ARABIAN JOURNAL OF CHEMISTRY
(2021)
Article
Multidisciplinary Sciences
Loic Constantin, Lisha Fan, Mathilde Pouey, Jerome Roger, Bai Cui, Jean-Francois Silvain, Yong Feng Lu
Summary: The study reports a spontaneous reaction for forming multilayer refractory carbide coatings on carbon fiber, showcasing a high-quality coating that acts as an oxidation barrier to protect the fibers from degradation. The successful synthesis of these coatings in a fast, efficient, easy, and clean manner may offer a solution for industrial applications requiring cheap and reliable protection barriers for extreme environments.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Article
Materials Science, Multidisciplinary
Ranran Su, Hongliang Zhang, Longfei Liu, John H. Perepezko
Summary: A Mo-Si-B based coating was applied on an RMPEA using a two-step coating strategy. It has exhibited minimal weight change after enduring more than 750 hours of thermal cycling oxidation exposure in the temperature range of room temperature to 1300 degrees Celsius. The formation of the Mo5SiB2 diffusion barrier in the coating prevents inward diffusion of coating components. Boron is then captured by the RMPEA, forming a layer of solid solution X5SiB2 (X = W, Mo, Ta, Nb, V) and an underlying RMPEA-B boride layer that acts as a second diffusion barrier.
Article
Environmental Sciences
Xiaoli Wu, Xiankui Zeng, Xueyan Lyu, Bin Gao, Yuanyuan Sun, Jichun Wu
Summary: This study investigated the transport of polystyrene nanoplastics (PSNPs) in water-saturated Fe/Al oxyhydroxide-coating sand through column experiments. The results showed that the presence of Fe and Al oxyhydroxides had a significant impact on PSNP retention, with Al oxyhydroxide exhibiting a stronger effect. pH played a critical role in the transport process, with the electrostatic interaction dominating the transport at pH values higher than the pH(PZC) of Fe/Al oxyhydroxides.
WATER AIR AND SOIL POLLUTION
(2022)
Article
Engineering, Environmental
Zhenyu Zhao, Shuai Peng, Canming Ma, Chao Yu, Deli Wu
Summary: During the pyrite oxidation process, secondary solid iron species, including Fe-coat and Fe-dep, were found to play significant roles in hydroxyl radical generation. The redox behavior of Fe-coat and Fe-dep during pyrite oxidation affects the oxidative dissolution of pyrite and the production of hydroxyl radicals.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Chemistry, Physical
Dejian Li, Chenrui Liu, Yun Liu, Xuemin Chen, Weifeng Wu, Feng Li, Jiang Tian, Zhi Dang
Summary: This study utilized eco-friendly natural green polyphenol tannic acid (TA) as a passivator to inhibit pyrite oxidation. Experimental and surface analysis results confirmed the inhibitory effect of TA. The TA passivation coating provided good antioxidant protection for pyrite, and the inhibition ability increased with higher TA concentration.
APPLIED SURFACE SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
Yanqiang Qiao, Xiao Zhang, Xiping Guo
Summary: A MoSi2 coating with a Y2O3 diffusion barrier was successfully prepared on a Nb-Si based alloy, which effectively suppressed the outward diffusion and inward consumption of certain elements in the alloy, resulting in the formation of a dense SiO2 scale.
Article
Chemistry, Multidisciplinary
Libo Wu, Minghui Ning, Xinxin Xing, Yu Wang, Fanghao Zhang, Guanhui Gao, Shaowei Song, Dezhi Wang, Chuqing Yuan, Luo Yu, Jiming Bao, Shuo Chen, Zhifeng Ren
Summary: Developing non-precious catalysts with long-term durability and structural stability is crucial for practical alkaline anion exchange membrane (AEM) water electrolysis. This study proposes an energy-saving method to synthesize defect-rich iron nickel oxyhydroxide catalysts with stability and efficiency for oxygen evolution reaction. The catalyst exhibits outstanding catalytic activity and durability, making it suitable for industrial water electrolysis.
ADVANCED MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Zigui Luo, Zhenjia Yang, Shangwei Jiang, Wei Wu, Guangqiang Li, Xi'an Fan
Summary: The design of magnetic insulation coating structure has always been a challenge for high-performance soft magnetic composites (SMCs). In this study, Fe-Si SMCs with silicate/nano-Fe composite coating were prepared successfully by in-situ oxidation method combined with spark plasma sintering (SPS). The formation mechanism of the composite coating and its effect on the electro-magnetic properties of Fe-Si SMCs were investigated.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Coatings & Films
Taoyuan Ouyang, Jinping Suo
Summary: TiC-based self-healing coatings have shown great potential in improving the lifetime of TBC by suppressing TGO growth. The TAZ20 coating exhibited sealing and filling effects, providing good oxidation resistance at high temperatures. Different structural strategies of TAZ20 coatings were found to influence their oxidation resistance performance.
SURFACE & COATINGS TECHNOLOGY
(2021)
Article
Metallurgy & Metallurgical Engineering
Ling-Yi Qian, Jing Wang, Yun-Shan Guo, He Liu, Ze-Bin Bao
Summary: The study aimed to investigate the effects of Ir and Pd additions on the oxidation behavior of PtAl coatings. Results showed that the Ir-modified PtAl coating exhibited better oxidation resistance than both Pd-modified and normal PtAl coatings, as Ir partly served as a diffusion barrier to reserve Al while Pd did not. This study provides important insights for the improvement of PtAl coatings.
ACTA METALLURGICA SINICA-ENGLISH LETTERS
(2021)
Article
Materials Science, Coatings & Films
A. Moll, J-J Blandin, R. Dendievel, E. Gicquel, M. Pons, C. Jimenez, E. Blanquet, F. Mercier
Summary: The study introduces an innovative process to develop 3D Ti-6Al-4V structures covered with AlN coating for protection against oxidation. By combining CVD and ALD deposition techniques, both AlN underlayer and top layer are successfully deposited to limit the formation of brittle titanium nitride phases.
SURFACE & COATINGS TECHNOLOGY
(2021)
Article
Engineering, Chemical
Hang Wang, Peter A. Dowd, Chaoshui Xu
Summary: This paper presents a case study of modelling the natural oxidation of pyrite in a gold ore stockpile to predict gold recovery through direct cyanide leaching. The study suggests that natural oxidation of gold-bearing pyrite may reduce processing costs and enable direct cyanide leaching for gold recovery. The research also demonstrates the use of a numerical model to estimate gold recovery based on the oxidation profile and gold distribution in pyrite grains.
MINERALS ENGINEERING
(2021)
Article
Engineering, Chemical
Amir Adeli, Peter Dowd, Xavier Emery, Chaoshui Xu
Summary: Predicted geometallurgical performance is being incorporated into mineral resource modelling to improve efficiency and reduce risk in mining operations. Machine learning techniques and cokriging can be used to predict metallurgical recovery by modeling mean values and spatial correlation structures.
MINERALS ENGINEERING
(2021)
Article
Astronomy & Astrophysics
E. Pardo-Iguzquiza, P. A. Dowd
Summary: This paper discusses the use of local fractal dimension to map the spatial variability of surface roughness on Mars, providing new insights into the Martian landscape. Results show that the roughness values on Mars are generally lower than those on Earth, with variations depending on the number of kilometric-scale landforms present. The abundance of information in the roughness maps offers valuable resources for planetary geology research.
Article
Geosciences, Multidisciplinary
Exequiel Sepulveda, Peter Dowd, Chaoshui Xu
Summary: The paper aims to provide a quantitative measure of grade heterogeneity at the selective mining unit scale within large estimated resource blocks, in order to evaluate the potential for selectively mining a resource block. The major challenge lies in the fact that the degree of heterogeneity is a function of scale, and the local conditional simulation approach is found to be the most suitable method for estimating the heterogeneity index.
MATHEMATICAL GEOSCIENCES
(2022)
Article
Engineering, Geological
Song Jiang, Ming Huang, Yujing Jiang, Chaoshui Xu, Binglei Li
Summary: The study investigated the deterioration characteristics of gypsiferous rocks under repeated wetting and drying actions, revealing visible cracks and enhanced dissolution of the rocks. The internal pore structure and particles detachment were found to be affected by the combined actions of W-D processes and water flow, leading to uneven reduction in specimen diameter. The feasibility of using pore structure parameters to characterize mechanical property deterioration of gypsiferous rocks under different water flow rates was demonstrated based on the proposed deterioration model.
ROCK MECHANICS AND ROCK ENGINEERING
(2022)
Article
Engineering, Chemical
Hang Wang, Chaoshui Xu, Peter A. Dowd, Zhihe Wang, Leon Faulkner
Summary: This paper presents a case study on the evaluation of in-situ copper recovery at the abandoned Kapunda mine site in Australia. It predicts the production by simulating the copper leaching and solution transport processes. An integrated simulation model using COMSOL Multiphysics is established, and the input parameters are derived from site investigations. The paper contributes to the initial economic analysis by providing an ISR copper production model for the Kapunda site.
MINERALS ENGINEERING
(2022)
Article
Engineering, Geological
Kai Xu, Ming Huang, Jiajie Zhen, Chaoshui Xu, Mingjuan Cui
Summary: This study investigates the potential application of enzyme-induced carbonate precipitation (EICP) for foundation reinforcement. The results show that after optimizing the operational parameters, EICP can improve the bearing capacity of soil foundations. Field tests demonstrate that EICP treatment has a significant effect on reinforcing the bedding layer and has high practical value.
JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING
(2023)
Article
Engineering, Mechanical
Mosleh Eftekhari, Chaoshui Xu
Summary: The MTS criterion based on SIFs can accurately predict the direction of crack propagation in specimens under direct tensile loading, but shows poorer accuracy in specimens under indirect tensile loading and 3-point bending. The stress distribution obtained by XFEM numerical models can provide a more accurate determination of the crack initiation direction.
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2023)
Review
Geochemistry & Geophysics
Dylan Peukert, Chaoshui Xu, Peter Dowd
Summary: Sensor-based sorting techniques have the potential to improve ore grades and reduce waste material processing by discarding waste before further processing, thus cutting energy, water, and reagent consumption. Evaluations of recent research on sensor-based sorting and fundamental sorting mechanisms emphasize the importance of optimal sensor selection and the fusion of data from multiple sensing techniques to enhance material characterization and sorting capability. The key to effective implementation lies in selecting a sensing technique capable of separating ore from waste based on sufficient sample distribution, with proposed classes of sensor fusion sorting applications in mineral processing illustrated with example cases.
Article
Geosciences, Multidisciplinary
Sultan Abulkhair, Peter A. Dowd, Chaoshui Xu
Summary: One of the most challenging aspects in multivariate geostatistics is dealing with the complex relationships between variables. Traditional geostatistical co-simulation and spatial decorrelation methods are not effective when dealing with multivariate complexities. On the other hand, multi-Gaussian transforms are designed to handle complex multivariate relationships, such as non-linearity, heteroscedasticity, and geological constraints. This study compares the performance of three multi-Gaussian transforms in transforming and simulating variables, with similar quality results observed among them.
MATHEMATICAL GEOSCIENCES
(2023)
Article
Geochemistry & Geophysics
Yerniyaz Abildin, Chaoshui Xu, Peter Dowd, Amir Adeli
Summary: Identifying mineralization zones plays a critical role in quantifying target mineral distribution. However, manual interpretation of mineral domains is labor-intensive and subjective, leading to deterministic outputs that ignore the uncertainty. This study compares PluriGaussian Simulation (PGS) and Hybrid Domaining Framework (HDF) approaches for defining mineral domains, finding that HDF can quantify uncertainty and handle complex problems. The effectiveness of HDF is demonstrated using geometallurgical models, and a noise filtering method is used to improve classification performance.
Article
Computer Science, Interdisciplinary Applications
Yerniyaz Abildin, Chaoshui Xu, Peter Dowd, Amir Adeli
Summary: This paper proposes a framework based on simulated grade distributions and machine learning classification techniques for automatically defining mineral domains and quantifying uncertainty. The study demonstrates that the approach can handle complex multi-class problems and quantify the uncertainty of domain boundaries.
APPLIED COMPUTING AND GEOSCIENCES
(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)
