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学者姓名：库建刚
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Abstract ：
针对现有微磁模拟软件无法直接计算磁力、宏观磁场下磁性矿粒所受磁力计算不精确以及动态磁化过程不明等问题,利用微磁学理论和数值模拟技术对现有的磁性矿粒磁力计算方式进行改进,结合多物理仿真软件COMSOL的物理场开发器、APP开发器以及磁场无电流物理场设计了一种计算磁性矿粒精确受力的软件.详细说明了磁性矿粒微磁模拟软件的原理,并将该软件与微磁学专业软件MERRILL在自发磁化状态下进行对比,最后比较传统仿真磁力计算方法和微磁学磁力计算方法在均匀磁场下计算 100 nm不规则磁铁矿颗粒磁力的准确性.研究结果表明:以相同的网格大小 5 nm对 80 nm的立方体磁性矿粒进行模拟,2 种软件呈现的不同初始状态的自发磁化状态一致;使用磁滞回线展现了正八面体磁性矿粒在变化磁场中的动态磁化过程;在均匀磁场下,采用微磁学的磁力计算方法相较于传统计算方法计算精度由 10-3 数量级提高至 10-11 数量级;该软件为从微磁学角度进行磁选理论研究提供了一个有力的工具,进一步促进了磁性矿粒在磁选过程中的动态磁化过程研究,对于提高磁性矿粒的磁力计算精度具有重要意义.
Keyword ：
二次开发 二次开发 微磁模拟 微磁模拟 矿物分选 矿物分选 磁力计算 磁力计算
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| GB/T 7714 | 丁伟 , 王前 , 李欣 et al. 磁性矿粒动态磁化模拟及精确磁力计算 [J]. | 金属矿山 , 2024 , (7) : 139-145 . |
| MLA | 丁伟 et al. "磁性矿粒动态磁化模拟及精确磁力计算" . | 金属矿山 7 (2024) : 139-145 . |
| APA | 丁伟 , 王前 , 李欣 , 库建刚 . 磁性矿粒动态磁化模拟及精确磁力计算 . | 金属矿山 , 2024 , (7) , 139-145 . |
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Understanding the internal magnetization structure of an individual ferromagnetic nanoparticle (MNP) is crucial for deciphering its magnetic characteristics. Unfortunately, while certain techniques can measure the magnetic properties of an individual MNP, they fall short of accurately detecting the internal magnetization structure. In this work, micromagnetic simulations were employed to construct the internal magnetization structure of an individual CoFe2O4 (CFO) nanopyramid, and the energy jump behavior during the magnetization process was successfully explained, with simulation results aligning with dynamic cantilever magnetometry (DCM) experimental outcomes. Subsequently, the external stray field of the nanopyramid was simulated, and the stray field gradient map revealed distinct bright and dark regions corresponding to the reverse and forward saturation magnetizations of the CFO nanopyramid. This result is possible to be verified by magnetic force microscopy (MFM) measurements of individual CFO nanopyramids. The confidence in the accuracy of the simulated internal magnetization structure was significantly enhanced by independently verifying the micromagnetic simulation results through DCM and MFM experiments. Our work proposes a convenient and cost-effective method for studying the internal magnetization structure of individual MNPs. © 2024 Author(s).
Keyword ：
Cost effectiveness Cost effectiveness Ferromagnetic materials Ferromagnetic materials Ferromagnetism Ferromagnetism Iron compounds Iron compounds Magnetic domains Magnetic domains Magnetic force microscopy Magnetic force microscopy Magnetization Magnetization Nanomagnetics Nanomagnetics
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| GB/T 7714 | Ku, Jiangang , Li, Xin , Wang, Zhaolian et al. Spin orientation evolution of individual ferromagnetic nanoparticle during reversing magnetization processes revealed by micromagnetic simulations [J]. | Journal of Applied Physics , 2024 , 136 (3) . |
| MLA | Ku, Jiangang et al. "Spin orientation evolution of individual ferromagnetic nanoparticle during reversing magnetization processes revealed by micromagnetic simulations" . | Journal of Applied Physics 136 . 3 (2024) . |
| APA | Ku, Jiangang , Li, Xin , Wang, Zhaolian , Wang, Qian , Xue, Fei . Spin orientation evolution of individual ferromagnetic nanoparticle during reversing magnetization processes revealed by micromagnetic simulations . | Journal of Applied Physics , 2024 , 136 (3) . |
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Magnetic separation technology is a physical separation method that uses the differences in magnetism between matter to separate them from each other by different motion behaviors in a non-uniform magnetic field. It is highly efficient, green, and environmentally friendly, with little change in the physical and chemical properties of raw materials. Magnetic separation technology is commonly used in the field of mineral processing engineering for magnetite, hematite, titanite, and other magnetic ferrous metal oxide minerals. This paper summarizes the application of magnetic separation technology for resource utilization and environmental treatment in different fields, such as non-metal decomposition, valuable metal recovery, use of magnetic carrier chemical separation, biomedical targeted magnetic separation, and use of magnetic species separation in water and wastewater treatment. We seek to review the application and potential of magnetic separation technology in various fields, emphasize their key role, and explore possible directions for their future development.
Keyword ：
black metal black metal chemical separation chemical separation magnetic minerals magnetic minerals magnetic selection magnetic selection magnetic separation technology magnetic separation technology
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| GB/T 7714 | Ku, Jiangang , Wang, Kunpeng , Wang, Qian et al. Application of Magnetic Separation Technology in Resource Utilization and Environmental Treatment [J]. | SEPARATIONS , 2024 , 11 (5) . |
| MLA | Ku, Jiangang et al. "Application of Magnetic Separation Technology in Resource Utilization and Environmental Treatment" . | SEPARATIONS 11 . 5 (2024) . |
| APA | Ku, Jiangang , Wang, Kunpeng , Wang, Qian , Lei, Zhongyun . Application of Magnetic Separation Technology in Resource Utilization and Environmental Treatment . | SEPARATIONS , 2024 , 11 (5) . |
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Magnetic separation is a primary method for processing iron ore and plays a crucial role in both current beneficiation practices and other fields. Extensive research has been conducted on the motion behavior of magnetic particles within magnetic separation equipment. However, force analysis, particularly the calculation of magnetic forces, remains imprecise when dealing with irregularly shaped particles. Accurate prediction of magnetic particle behavior requires precise magnetic force calculations. This study introduces micromagnetic simulations to accurately compute the magnetic forces on irregular magnetic particles. Micromagnetic simulations can determine the precise magnetic moments and magnetic induction intensities within each microelement of the particle. The results of these simulations will be validated using magnetic force microscopy (MFM). The findings indicate that traditional magnetic force calculations deviate from the precise calculations presented in this study. For irregular particles, the computational errors in repulsive and attractive forces are 770% and 576% higher, respectively, compared to spherical particles. This underscores the necessity of considering particle shape in realistic magnetic force calculations. Additionally, both the MFM measurement images and the simulated magnetic force maps exhibit bright and dark regions correlated with particle shape, demonstrating that micromagnetic simulation results can be verified through MFM measurements. This paper proposes an experimentally verifiable method for accurately calculating the magnetic forces on magnetic particles using micromagnetic simulations, which holds significant implications for designing more efficient and precise magnetic separation equipment. © 2024
Keyword ：
Iron research Iron research Magnetic bubbles Magnetic bubbles Magnetic levitation Magnetic levitation Magnetic separation Magnetic separation Magnetic separators Magnetic separators Magnetite Magnetite
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| GB/T 7714 | Li, Xin , Wang, Zhaolian , Wang, Qian et al. Accurate calculation of magnetic forces on magnetic mineral particles using micromagnetic simulations [J]. | Minerals Engineering , 2024 , 218 . |
| MLA | Li, Xin et al. "Accurate calculation of magnetic forces on magnetic mineral particles using micromagnetic simulations" . | Minerals Engineering 218 (2024) . |
| APA | Li, Xin , Wang, Zhaolian , Wang, Qian , Jiang, Kaixi , Ku, Jiangang . Accurate calculation of magnetic forces on magnetic mineral particles using micromagnetic simulations . | Minerals Engineering , 2024 , 218 . |
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In this paper, two artificial magnetic particles (1#, 2#) with known magnetic parameters were taken as the objects, a finite element model based on Gauss's law was established for the calculation of the transient Maxwell magnetic stress tensor on the surfaces of particles and kinetic study, a high-speed camera was used to obtain the motion behaviors of magnetic particles in comparison with the simulation. According to the results of multiple simulation-experiment comparisons, the motion behaviors of magnetic particles in the finite element simulation were consistent with experimental phenomena under the identical conditions, indicated that the accuracy of the model is reliable. In the comparison of two kinds of magnetic force calculations, the magnetic force FM based on the Gaussian formula had a similar tendency to FD based on the kinetic calculations, and since the FM was obtained by converting the surface tension of particles, it more accurately reflected the overall magnetic force and magnetic torque acting on the particles. Kinetic analysis showed that the magnetic force acting on a particle was strictly dependent on its magnetization, dynamic and non-uniform magnetization caused the magnetic particle to be subjected to magnetic force and magnetic torque in the non-uniform magnetic field, resulting in displacements and flips. In addition, compared to the particle release attitude, the influence of the distribution of magnetic substance and the particle's release position on the displacement was particularly significant. The 3D finite element model established for dry magnetic separation can be further used for the study of dynamic, non-uniform magnetization and the force of magnetic particle or grain groups, which is of certain significance for the kinetic study of magnetic separation and improving research of magnetic separation equipment. © 2024 Elsevier Ltd
Keyword ：
Gaussian distribution Gaussian distribution Kinetic theory Kinetic theory Magnetic bubbles Magnetic bubbles Tensors Tensors
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| GB/T 7714 | Lei, Zhongyun , Yan, Jujian , Xie, Yinan et al. Kinetic study of dry magnetic separation based on Gauss-Maxwell magnetic stress tensor: A 3D finite element method (FEM) [J]. | Minerals Engineering , 2024 , 218 . |
| MLA | Lei, Zhongyun et al. "Kinetic study of dry magnetic separation based on Gauss-Maxwell magnetic stress tensor: A 3D finite element method (FEM)" . | Minerals Engineering 218 (2024) . |
| APA | Lei, Zhongyun , Yan, Jujian , Xie, Yinan , Yang, Liheng , Wang, Qian , Ku, Jiangang . Kinetic study of dry magnetic separation based on Gauss-Maxwell magnetic stress tensor: A 3D finite element method (FEM) . | Minerals Engineering , 2024 , 218 . |
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The direct and rapid determination of trace cobalt ion (Co2+) in the electrolyte of zinc smelting plants is urgently needed but is impeded by the severe interference of extremely high-concentration zinc ions in the solution. Herein, colorimetric detection of Co2+ by the polyvinylpyrrolidone functionalized silver nanoparticles (PVP-AgNPs) is realized in solutions with the Zn/Co ratio being high, up to (0.8-5) x 10(4), which is located within the ratio range in industrial solution. The high concentration of Zn2+ induces a strong attenuation of Co2+-related signals in ultraviolet-visible (UV-vis) extinction spectra; nevertheless, a good linear range for detecting 1-6 mg/L Co2+ in 50 g/L Zn2+ solution is still acquired. The strong anti-interference toward other metal ions and the mechanism understanding for trace Co2+ detection in such a high-concentration Zn2+ solution are also revealed by systematic analysis techniques. The results extend the AgNPs as colorimetric sensors to industrial solutions, providing a new strategy for detecting trace-metal ions in industrial plants.
Keyword ：
colorimetric detection colorimetric detection industrial high-concentration zinc solution industrial high-concentration zinc solution polyvinylpyrrolidone polyvinylpyrrolidone silver nanoparticles silver nanoparticles trace Co2+ determination trace Co2+ determination
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| GB/T 7714 | Xiao, Ni , Weng, Wei , Tang, Ding et al. Extending Ag Nanoparticles as Colorimetric Sensor to Industrial Zinc Electrolyte for Cobalt Ion Detection [J]. | MOLECULES , 2023 , 28 (2) . |
| MLA | Xiao, Ni et al. "Extending Ag Nanoparticles as Colorimetric Sensor to Industrial Zinc Electrolyte for Cobalt Ion Detection" . | MOLECULES 28 . 2 (2023) . |
| APA | Xiao, Ni , Weng, Wei , Tang, Ding , Tan, Wen , Zhang, Liye , Deng, Zheyuan et al. Extending Ag Nanoparticles as Colorimetric Sensor to Industrial Zinc Electrolyte for Cobalt Ion Detection . | MOLECULES , 2023 , 28 (2) . |
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At present, a large quantity of iron resource could not be utilized effectively, such as iron oxides (e.g., oolitic hematite, limonite and cyanide residue) and smelting slags in the form of fayalite (e.g., iron slag, copper slag and nickel slag). This kind of iron resources, containing 30%-40% iron, is still very difficult to be recycled or utilized. Currently, deep reduction technology, which has been put forward to improve the grade of iron ore, is developing rapidly and is expected to solve the resource problem. But the research on the mechanism of iron grain nucleation and growth behavior in the deep reduction process is not systematic and thorough. We summarize the thermodynamic theory of iron grain nucleation, combined with Turnbull linear model and DubeyRamachandrarao theoretical model. Based on Hillert-type 3D grain growth rate model and Avrami-Erofeyev model, the total free energy in the reaction process is analyzed, critical nucleation radius of iron grain is calculated, the mechanism of iron grain nucleation and growth behavior of iron grain is clarified. This paper provides a systematic theory and experimental validation for nucleation mechanism and iron grain growth behavior in deep reduction of Fe-based oxygen carrier.
Keyword ：
Deep reduction Deep reduction Growth Growth Iron grain Iron grain Nucleation Nucleation Supercooling degree Supercooling degree
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| GB/T 7714 | Lin, Hanyu , Ran, Hongxiang , Zhong, Shuiping et al. Review on nucleation and growth behavior of iron grain during deep reduction [J]. | POWDER TECHNOLOGY , 2023 , 424 . |
| MLA | Lin, Hanyu et al. "Review on nucleation and growth behavior of iron grain during deep reduction" . | POWDER TECHNOLOGY 424 (2023) . |
| APA | Lin, Hanyu , Ran, Hongxiang , Zhong, Shuiping , Ku, Jiangang . Review on nucleation and growth behavior of iron grain during deep reduction . | POWDER TECHNOLOGY , 2023 , 424 . |
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We used a 3D finite element method (FEM) to calculate the interaction force between two uniformly magnetized particles. The calculation results of finite element are compared with the calculation results of two magnetic dipole formulas commonly used in literature. The magnetic strength and magnetic induction intensity on the surface of a magnetized particle in magnetic field is integrated, then the magnetic field strength H herm in formula is corrected and a more accurate magnetic dipole formula is derived. The results show that when the inter-particle distance is less than 2. 5 times the particle diameter, compared with the finite element calculation results, the error of magnetic dipole formulas is significant. The error decreases with the increase of inter-particle distance, but the minimum value is still more than 31%. Compared with the 3D-FEM, the error of magnetic force calculated by the new formula can be reduced to less than 3%, which significantly improves the calculation accuracy of magnetic force between adjacent magnetic particles. © 2023 China University of Mining and Technology. All rights reserved.
Keyword ：
3D FEM 3D FEM attractive force attractive force magnetic dipole magnetic dipole magnetic sphere magnetic sphere new formula new formula
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| GB/T 7714 | Zhao, Y. , Ran, H. , Yan, Q. et al. Study of the magnetic force between magnetic particles in magnetic field based on 3D-FEM; [磁场中磁性颗粒间磁力的三维有限元分析] [J]. | Journal of China University of Mining and Technology , 2023 , 52 (5) : 1022-1029 . |
| MLA | Zhao, Y. et al. "Study of the magnetic force between magnetic particles in magnetic field based on 3D-FEM; [磁场中磁性颗粒间磁力的三维有限元分析]" . | Journal of China University of Mining and Technology 52 . 5 (2023) : 1022-1029 . |
| APA | Zhao, Y. , Ran, H. , Yan, Q. , Ku, J. . Study of the magnetic force between magnetic particles in magnetic field based on 3D-FEM; [磁场中磁性颗粒间磁力的三维有限元分析] . | Journal of China University of Mining and Technology , 2023 , 52 (5) , 1022-1029 . |
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Real-time and rapid determination of trace copper ion (Cu2+) in the electrolyte of zinc smelting process is urgently needed. However, the complicated composition of the electrolyte, especially the extremely high-concentration of zinc ion (Zn2+) may cause severe interference to the detection of Cu2+. This work describes a facile electrochemical sensor for Cu2+ determination in the electrolyte of zinc smelting plants based on a fluorine-doped tin oxide (FTO) electrode with silver nanowires (AgNWs) and Nafion modification. The AgNWs/Nafion-FTO electrode showed good detection ability with the linear detection range of 0.2-2 mg l-1 Cu2+ in 45 g l-1 Zn2+ solution using differential pulse anodic stripping voltammetry (DPASV) technique. With DPASV technique, Cu2+ can be first reduced and pre-concentrated on the working electrode surface at -0.6 V vs Ag/AgCl for 500 s, after which the deposited Cu metal is oxidized around 0 V vs Ag/AgCl during the stripping step. It has been proved by transmission electron microscopy (TEM) and X-ray photoelectron spectra (XPS) that trace Cu2+ can be adsorbed and reduced on AgNWs in solutions with Zn/Cu ratio up to (2.25-22.5) x 104. The results extend AgNWs modified electrode to the industrial solution, providing a new strategy for detection of trace metal ions in industrial solutions.
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| GB/T 7714 | Xiao, Ni , Chen, Yinan , Tan, Wen et al. Extending Silver Nanowire Modified Electrodes to Industrial Zinc Electrolyte for Copper Ion Detection [J]. | JOURNAL OF THE ELECTROCHEMICAL SOCIETY , 2023 , 170 (9) . |
| MLA | Xiao, Ni et al. "Extending Silver Nanowire Modified Electrodes to Industrial Zinc Electrolyte for Copper Ion Detection" . | JOURNAL OF THE ELECTROCHEMICAL SOCIETY 170 . 9 (2023) . |
| APA | Xiao, Ni , Chen, Yinan , Tan, Wen , Ku, Jiangang , Wang, Qiang , Chen, Hang et al. Extending Silver Nanowire Modified Electrodes to Industrial Zinc Electrolyte for Copper Ion Detection . | JOURNAL OF THE ELECTROCHEMICAL SOCIETY , 2023 , 170 (9) . |
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High gradient magnetic separation technology is a green production technology that has an unparalleled superiority in separating fine and weak magnetic particles. As the characteristics of poor, fine, and heterogeneous in weakly magnetic mineral resources (hematite, wolframite, rhodochrosite, etc.), the importance of developing the technology is constantly highlighted. Meanwhile, the research and development of energy-saving, high-efficiency and lightweight high gradient magnetic separators (HGMS) becomes necessary to achieve the mining industry's carbon neutrality aim. This paper systematically summarized the magnetic particle motion dynamics model and magnetic particle accumulation model based on the magnetic field distribution. The basic concepts for optimizing the sorting effect, methods for reducing power consumption and magnetic energy dissipation are also proposed. Our work proposes new theoretical frameworks and perspectives on capturing magnetic particles in HGMSs, which facilitates researchers to deepen their understanding of the mechanism of HGMSs, and is conducive to the further optimization of the design and the development of better cleaner production technologies for the sustainable development of the iron and steel industry.
Keyword ：
Accumulation model Accumulation model Carbon neutrality Carbon neutrality Force analysis Force analysis High gradient magnetic separator (HGMS) High gradient magnetic separator (HGMS) Low carbon production Low carbon production Particle trajectory models Particle trajectory models
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| GB/T 7714 | Lin, Hanyu , Li, Xin , Lei, Zhongyun et al. Developing high gradient magnetic separators for greener production: Principles, design, and optimization [J]. | JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS , 2023 , 587 . |
| MLA | Lin, Hanyu et al. "Developing high gradient magnetic separators for greener production: Principles, design, and optimization" . | JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS 587 (2023) . |
| APA | Lin, Hanyu , Li, Xin , Lei, Zhongyun , Ku, Jiangang , Wang, Zhaolian . Developing high gradient magnetic separators for greener production: Principles, design, and optimization . | JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS , 2023 , 587 . |
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