Article
Materials Science, Multidisciplinary
Tao Xie, S. E. Nikitin, A. Kolesnikov, E. Mamontov, L. M. Anovitz, G. Ehlers, I Huskic, T. Friscic, A. Podlesnyak
Summary: The magnetism of a synthetic polymorph of the quasi-two-dimensional natural metal-organic framework material stepanovite NaMgFe(C2O4)(3)center dot 9H(2)O was studied using inelastic neutron scattering (INS), specific heat, and magnetization analysis. The results revealed an easy-axis anisotropy of the Fe3+ ion and no long-range magnetic order observed down to 0.5 K.
Article
Metallurgy & Metallurgical Engineering
Xuexin Chen, Jie Zhang, Baijun Yan
Summary: The study successfully prepared V2O3 through oxalic acid leaching method and designed two routes for preparation, ultimately obtaining a high crystallinity V2O3 product.
Article
Materials Science, Multidisciplinary
Biao Shen, Xuexin Chen, Baijun Yan
Summary: Hydrothermal leaching of vanadium using oxalic acid is a novel method for extracting vanadium from concentrates. This study investigated the leaching kinetics and mechanism of vanadium from a concentrate using oxalic acid, and proposed a kinetic model to describe the leaching process. Several important findings were obtained regarding the rate-controlling step, activation energy, and reaction order of the leaching process.
Article
Engineering, Chemical
Xinran Zhu, Zhenya Zhou, Jianping Jin, Yanjun Li, Yuexin Han
Summary: In this study, a combination of oxidation roasting (without salt) and acid leaching was used to extract vanadium from V-bearing shale. Pilot scale testwork confirmed that the process achieved over 85% vanadium extraction. The phase transformation and microstructure evolution during oxidation roasting were found to have significant effects on the subsequent leach process.
MINERALS ENGINEERING
(2023)
Article
Geosciences, Multidisciplinary
Mingxuan Zhou, Shifeng Dai, Zhen Wang, Baruch F. Spiro, Avner Vengosh, David French, Ian T. Graham, Fenghua Zhao, Jianping Zuo, Jingtao Zhao
Summary: The concentration and isotopic ratios of strontium (Sr) in leachates extracted from Permian coals in Chongqing, China, were studied using selective leaching techniques. The results showed variations in Sr concentration and Sr-87/Sr-86 ratios among the different leachates, indicating differences in solubility of Sr-bearing minerals in the coals. The presence of carbonate minerals in the coals was found to be of late diagenetic or epigenetic origin rather than syngenetic marine origin, as previously thought.
Article
Chemistry, Multidisciplinary
Ming Hao, Hao Li, Li Cui, Wei Liu, Baizeng Fang, Jinsheng Liang, Xinlei Xie, Dongxu Wang, Fei Wang
Summary: The study investigates the assembly of MoS2 nanosheets on a mineral support to improve access to active sites. A pangolin-like composite catalyst consisting of MoS2 nanosheets deposited on tourmaline was synthesized, which degrades pollutants more effectively than pure MoS2 nanosheets. This approach represents a new tactic for the cost-effective batch preparation of two-dimensional materials with high catalytic performance.
ENVIRONMENTAL CHEMISTRY LETTERS
(2021)
Article
Energy & Fuels
Fateme Hormozzade Ghalati, James A. Craven, Dariush Motazedian, Stephen E. Grasby, Victoria Tschirhart
Summary: An audio-magnetotelluric (AMT) survey was conducted to explore shallow geothermal resources in the Garibaldi Volcanic Belt in Canada. The survey revealed complex 3-D subsurface structure, with high conductivity features related to hydrothermal alteration in the south and north regions. Clay cap layers connect to the surface, and conductive zones are located near warm springs along Meager Creek. Integrating the AMT model, geology, and temperature data is crucial for building a conceptual model of the Mount Meager geothermal system.
Article
Chemistry, Physical
Fangfang Miao, Mimei Zhang, Yinzhuang Zhou
Summary: Two novel inorganic-organic hybrid vanadates complexes [Ni(H(2)biim)(3)]V2O6 (H(2)biim = 2,2'-biimidazole) 1 and [Ni(H(2)biim)(3)][(VO2)(SO4)](2) were synthesized and characterized by single-crystal X-ray diffraction. Compound 2 showed fluorescence properties.
JOURNAL OF MOLECULAR STRUCTURE
(2022)
Article
Materials Science, Ceramics
Aviraj M. Teli, Sonali A. Beknalkar, Yu Ri Lee, Jae Cheol Shin
Summary: The present work aims to synthesize a quaternary metal oxide by a simple and cost-effective method and analyze its electrochemical performance. The results show that the synthesized MoVMnAg-oxide@Ni-foam has high areal capacitance and energy storage density, making it suitable for energy storage applications.
CERAMICS INTERNATIONAL
(2022)
Article
Geochemistry & Geophysics
Teng Deng, Longyue Zhou, Zenghua Li
Summary: Hydrothermal alteration with bleaching of host rocks is a prominent prospecting indicator for gold deposits in the Jiangnan Orogen Belt. However, the reliability of this indicator is questioned due to the decrease in alteration intensity with depth and the occurrence of gold mineralization in non-bleached rocks. Detailed petrographic work and SEM analysis reveal the presence of two types of siderites, Sd1 and Sd2, which were altered by auriferous fluids and can contribute to gold precipitation.
Article
Chemistry, Inorganic & Nuclear
Xinan Zhang, Yanling Jin, Wenxuan Zhu, Dan Chen, Qingqing Huang, Yaping Li, Olivier Mentre, Claire Minaud, Minfeng Lu
Summary: Five new vanadium and iron fluoride phosphates with the formula Ax(NH4)3-xM4(PO4)2F7(OH)2 (A = K, Rb, Cs, and M = V, Fe) were synthesized via hydrothermal redox reactions. These compounds exhibit monoclinic crystal structure with space group P21/m. The crystal structure consists of three-dimensional frameworks with channels along [001] direction, where A+ or (NH4)+ ions are located. Novel structural motifs composed of corner-shared cubane M4 clusters form & INFIN;[M4O8F7(OH)2]10- chains. In the isostructural series, the interconnection between these units involves corner-shared cubane M4 S = 1 spin-chains (M = V3+) and corner-shared cubane M4 S = 5/2 spin-chains (M = Fe3+), which promote antiferromagnetic interactions.
JOURNAL OF SOLID STATE CHEMISTRY
(2023)
Article
Geochemistry & Geophysics
Matthia Weil
Summary: Single crystals of lead(II) oxoarsenates(V) were successfully grown and their crystal structures were compared through X-ray diffraction. It was also found that NaPb4(AsO4)(3) is the first lacunar apatite comprising only tetrahedral anions and adopting the belovite structure type.
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)