Advanced Powder Technology最新文献_第9页

In depth exploration of the microbial dust suppression mechanism: from the perspective of CaCO3 characteristics 微生物抑尘机理的深入探讨：从CaCO3特性的角度

IF 4.2 2区工程技术 Q2 ENGINEERING, CHEMICAL

Advanced Powder Technology

Pub Date : 2025-12-01 Epub Date: 2025-11-11 DOI: 10.1016/j.apt.2025.105101

Yue Feng , Mei-Xuan Ha , Xiang-Ming Hu , Pan-Pan Qiu , Yan-Yun Zhao , Li Chen , Yan-Lin Qu , Tong Li , Hui Rong , Xiao-Niu Yu

Microbial dust suppressants, an eco-friendly dust control method, have been widely studied for improving suppression efficiency. This study focused on CaCO₃ precipitation characteristics (production, crystal form, particle size, and morphology) and investigated the relationship with dust suppression performance and elucidated the underlying mechanism. Results found that changes in these characteristics affect the erosion resistance of the consolidated layer. And, high production, calcite form, small particle size, and rod-shaped morphology enhanced consolidation strength. Furthermore, production showed the strongest correlation with erosion resistance (p = 0.008, p < 0.001), followed by crystal form (p < 0.001, p = 0.01) and morphology (p = 0.016, p = 0.008), while particle size had the weakest correlation (p = 0.037, p = 0.025). Meanwhile, the discrete element method (DEM) was used to simulate the interaction between different types of CaCO₃ and coal. Research found that high-production, calcite type, small particle size, and rod-shaped CaCO₃ improved the consolidation effect by generating more contact bonds with coal powder particles, providing stronger mechanical properties, entering deeper pores, and connecting more coal powder particles. This work identified key CaCO₃ related factors influencing microbial dust suppression, offering clear guidance for optimizing microbial agents.

微生物抑尘剂作为一种环保型抑尘方法，为提高抑尘效果而得到了广泛的研究。本研究主要研究CaCO3的析出特性（产生、晶型、粒度和形貌），并探讨其与抑尘性能的关系，并阐明其机理。结果发现，这些特性的变化会影响固结层的抗侵蚀性能。高产量、方解石形态、小粒度和棒状形态增强了固结强度。产量与耐蚀性相关性最强（p = 0.008, p < 0.001），其次是晶型（p < 0.001, p = 0.01）和形貌（p = 0.016, p = 0.008），粒径相关性最弱（p = 0.037, p = 0.025）。同时，采用离散元法（DEM）模拟了不同类型CaCO3与煤的相互作用。研究发现，高产、方解石型、小粒径、棒状的CaCO3通过与煤粉颗粒产生更多的接触键，提供更强的力学性能，进入更深的孔隙，连接更多的煤粉颗粒，从而改善了固结效果。本研究确定了影响微生物抑尘的关键CaCO3相关因素，为微生物制剂的优化提供了明确的指导。

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引用次数: 0

Early hydration reaction of nano-alumina-modified cement dominated by liquid phase, heat release and microstructure development 纳米氧化铝改性水泥的早期水化反应以液相、放热和微观结构发育为主

IF 4.2 2区工程技术 Q2 ENGINEERING, CHEMICAL

Advanced Powder Technology

Pub Date : 2025-12-01 Epub Date: 2025-11-24 DOI: 10.1016/j.apt.2025.105118

Ying Liu , Quanle Zou , Yunpei Liang , Chaojun Fan , He Li

The early hydration of cement governs its microstructure development and engineering properties, where nano-alumina (NA) has emerged as a potent accelerator. This study systematically investigates the multi-scale effects of NA mass fraction on hydration kinetics by integrating liquid-phase evolution, heat release, and microstructural transformations. Modified cement pastes with varying NA mass fractio contents were analyzed using nuclear magnetic resonance, isothermal calorimetry, scanning electron microscopy, and ionic mobility measurements. Results demonstrate that NA accelerates capillary-to-gel water conversion by 4 h through enhanced nucleation, reducing gel water retention time while refining pore architecture. The heat release profiles reveal NA’s dual action: intensifying initial dissolution peaks and advancing acceleration stage onset through lowered C-S-H nucleation barriers. Microstructural evolution shows dose-dependent morphological shifts, where NA transforms C-S-H into interconnected networks and directs needle-like calcium aluminate growth at interfaces. Ionic dynamics confirm NA’s catalytic role, inducing earlier Ca²⁺ saturation and accelerating AFt to AFm conversion within 16 h via Al³⁺ consumption. These findings elucidate NA’s synergistic mechanisms in accelerating cement hydration, offering critical insights for high-performance composites.

水泥的早期水化作用决定了其微观结构的发展和工程性能，纳米氧化铝（NA）已成为一种有效的促进剂。本研究系统地考察了NA质量分数对水化动力学的多尺度影响，包括液相演化、热释放和微观结构转变。采用核磁共振、等温量热法、扫描电镜和离子迁移率测量对NA质量分数含量不同的改性水泥浆进行了分析。结果表明，NA通过增强成核加速了4小时的毛细管-凝胶水转化，减少了凝胶水保留时间，同时改善了孔隙结构。热释放曲线揭示了NA的双重作用：通过降低C-S-H成核势垒，强化初始溶解峰和提前加速阶段的开始。微观结构演化表现出剂量依赖的形态变化，NA将C-S-H转化为相互连接的网络，并在界面处指导针状铝酸钙生长。离子动力学证实了NA的催化作用，诱导Ca2+提前饱和，并通过Al3+消耗在16 h内加速AFt向AFm的转化。这些发现阐明了NA在加速水泥水化中的协同机制，为高性能复合材料提供了重要见解。

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引用次数: 0

Effect of meso/micro multiple scale turbulent shear mixing on the synthesis process of micro/nano oxide particles in continuous multistage Rankine vortex flow 中/微多尺度湍流剪切混合对连续多级朗肯涡流中微/纳米氧化物颗粒合成过程的影响

IF 4.2 2区工程技术 Q2 ENGINEERING, CHEMICAL

Advanced Powder Technology

Pub Date : 2025-12-01 Epub Date: 2025-11-04 DOI: 10.1016/j.apt.2025.105094

Yanqing Guo , Jiaying Lu , Luming Chen , Jie Yang , Xiaogang Yang , Yihang Xin

An Eulerian Computational Fluid Dynamics modelling coupled with the use of Lagrangian Discrete Phase Model (CFD/DPM) was employed to investigate the effect of meso/micro multiple-scale turbulent mixing on the synthesis process of micro/nano oxide particles in a continuous multistage Rankine vortex flow. The changes from micro- to macro-scale interactions among different scales, including the coupling of particle entrainment by turbulent eddies and synthesis reaction in the Rankine vortex flow and the mesoscale structure (i.e., particle aggregates and reactor scales) were systematically studied, especially focusing on the influence of meso/micro scale turbulent eddies on the synthesized micro/nano particles. It has been demonstrated that the use of Eulerian-Lagrangian framework (CFD/DPM) can effectively capture the simultaneous interactions between aggregated particles and turbulent eddies, enabling the evaluation of how operational variations, specifically in the eddy size based Reynolds number and reactant concentration, to affect the final particle properties. Numerical results for a range of these conditions have shown a strong agreement with the experimental data. The present study has demonstrated that the multistage Rankine vortex flow can effectively intensify the local turbulence induced shear at meso/micro scales, thereby controlling nanoparticle aggregation and breakage to facilitate the production of uniform, meso-sized particles with well-defined morphology.

采用欧拉计算流体力学模型和拉格朗日离散相模型（CFD/DPM），研究了连续多级朗肯涡流中中观/微观多尺度湍流混合对微/纳米氧化物颗粒合成过程的影响。系统研究了不同尺度间相互作用从微观到宏观的变化，包括Rankine涡旋中湍流涡旋夹带粒子与合成反应的耦合以及中尺度结构（即粒子聚集体和反应器尺度），重点研究了中/微尺度湍流涡旋对合成微/纳米粒子的影响。已经证明，使用欧拉-拉格朗日框架（CFD/DPM）可以有效地捕获聚集颗粒与湍流涡流之间的同时相互作用，从而能够评估操作变化，特别是基于雷诺数和反应物浓度的涡流大小，如何影响最终颗粒性质。这些条件的数值结果与实验数据非常吻合。本研究表明，多级朗肯涡旋流动可以有效地增强局部湍流引起的中观/微观尺度剪切，从而控制纳米颗粒的聚集和断裂，从而促进均匀的、具有明确形态的中观尺寸颗粒的产生。

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引用次数: 0

Modulating the low-temperature NH3-SCR activity of bimetallic MOF-derived MnCeOx/C catalyst via the molar ratio of manganese and cerium 锰铈摩尔比对mof衍生MnCeOx/C催化剂低温NH3-SCR活性的调节

IF 4.2 2区工程技术 Q2 ENGINEERING, CHEMICAL

Advanced Powder Technology

Pub Date : 2025-12-01 Epub Date: 2025-11-11 DOI: 10.1016/j.apt.2025.105102

Ruichao Yang , Zhifang Li , Jinxing Cui , Yuanyuan Ma , Changlong Yang

The elimination of nitrogen oxides has become a focal point in the field of the control of air pollution. A series of MnCeO_x/C catalysts are synthesized using in-situ pyrolysis under N₂ atmosphere using bimetallic Mn/Ce-MOF as the precursor. The effects of different Mn/Ce molar ratios on the structure, physicochemical properties and NH₃-SCR performance are investigated. The results show that the Mn3Ce1O_x/C catalyst displays excellent low-temperature activity (NO_x conversion is more than 90 %) at 175–275 ℃. This is attributed to the large specific surface area of the Mn3Ce1O_x/C, while the addition of Ce promotes the formation of oxygen vacancies through the Mn³⁺+Ce⁴⁺↔ Ce³⁺ + Mn⁴⁺ redox cycle, which further facilitates the oxidation of NO to NO₂, resulting in the formation of a “fast SCR” reaction. Meanwhile, the Mn3Ce1O_x/C catalyst has prominent tolerance to H₂O and SO₂, which is attributed to the sacrificial site Ce to protect the active component Mn as well as the hydrophobicity of the MOF-derived carbon material. This work provides a novel approach for designing high-performance low-temperature SCR catalysts.

氮氧化物的消除已成为大气污染治理领域的一个热点。以双金属Mn/Ce-MOF为前驱体，在N2气氛下原位热解合成了一系列MnCeOx/C催化剂。研究了不同Mn/Ce摩尔比对结构、理化性质和NH3-SCR性能的影响。结果表明，mn3ce10ox /C催化剂在175 ~ 275℃具有良好的低温活性（NOx转化率大于90%）。这是由于Mn3Ce1Ox/C具有较大的比表面积，而Ce的加入通过Mn3++Ce4+↔Ce3+ + Mn4+氧化还原循环促进了氧空位的形成，这进一步促进了NO氧化为NO2，从而形成了“快速SCR”反应。同时，mn3ce10ox /C催化剂对H2O和SO2具有突出的耐受性，这是由于mof衍生碳材料的疏水性以及为保护活性成分Mn而牺牲的位点Ce。本研究为设计高性能低温SCR催化剂提供了一条新的途径。

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引用次数: 0

Thermochemical heat storage performance of MgO/Mg(OH)2 particles in a fluidized bed 流化床中MgO/Mg(OH)2颗粒的热化学储热性能

IF 4.2 2区工程技术 Q2 ENGINEERING, CHEMICAL

Advanced Powder Technology

Pub Date : 2025-12-01 Epub Date: 2025-11-21 DOI: 10.1016/j.apt.2025.105125

Naoya Shirota , Masahiro I. Aoki , Takuto Aoki , Chihiro Fushimi

For rapid heat discharge of a thermochemical energy storage system, we investigated the temperature profiles of MgO/Mg(OH)₂ during hydration in a fluidized bed by varying the steam partial pressure (50‒90 vol%), inlet gas temperature (110‒150 °C), fluidization number (2‒4 times of minimum fluidization velocity), and particle diameter (90‒180, 250‒350, and 350‒500 μm). The heat discharge temperature of MgO increased with increasing steam partial pressure and decreasing fluidizing gas velocity. The bed temperature rapidly increased within 1 min of steam supply owing to exothermic hydration. The bed temperature rapidly decreased, stabilized for several minutes, and then progressively decreased. The optimal conditions for high-efficiency heat-discharge storage were determined to be (1) an inlet gas temperature of 110 °C, (2) a fluidization number of 2, and (3) particle sizes of 350‒500 or 250‒350 μm (Geldart Group B particles) under these experimental conditions. For the same fluidization number, the particle size did not have a significant effect on the heat discharge performance unless the particles were elutriated from the reactor. The heat storage and discharge cycles (i = 10) decreased the particle size from 460 to 280 µm, the maximum temperature of the fluidized bed from 168 to 145 °C, and the conversion of MgO during hydration from 71 to 60 mol%.

为了实现热化学储能系统的快速放热，研究了流化床水化过程中MgO/Mg(OH)2的温度分布，包括蒸汽分压（50-90 vol%）、入口气体温度（110-150°C）、流化数（最小流化速度的2 - 4倍）和颗粒直径（90-180、250-350和350-500 μm）。MgO的放热温度随着蒸汽分压的增大和流化气速的减小而升高。由于放热水化作用，床层温度在供汽后1 min内迅速升高。床温迅速下降，稳定几分钟后逐渐下降。实验确定了高效蓄热的最佳条件为：(1)进口气体温度为110℃，(2)流态化数为2，(3)颗粒尺寸为350 ~ 500 μm或250 ~ 350 μm （Geldart Group B颗粒）。对于相同的流化数，颗粒大小对热排放性能没有显著影响，除非颗粒从反应器中被洗脱。储放循环次数（i = 10）使颗粒粒径从460µm降低到280µm，流化床最高温度从168℃降低到145℃，水化过程中MgO的转化率从71 mol%降低到60 mol%。

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引用次数: 0

A multi-superquadric DEM method for high-fidelity modelling mixing and breakage of non-spherical particles in rotary drums 一种高保真模拟转鼓中非球形颗粒混合与破碎的多次超二次DEM方法

IF 4.2 2区工程技术 Q2 ENGINEERING, CHEMICAL

Advanced Powder Technology

Pub Date : 2025-12-01 Epub Date: 2025-11-19 DOI: 10.1016/j.apt.2025.105076

Zhan Luo, Shuai Wang, Yansong Shen

Non-spherical particles are widely encountered in engineering applications, yet their irregular shapes pose challenges for accurate modelling in the discrete element method (DEM) framework. This study develops a novel multi-superquadric particle model that incorporates both combination and separation operations for sub-particles, enabling the simulation of non-spherical particle breakage under specific trigger conditions. For the first time, the coexistence of intact multi-superquadric particles and their sub-particles post-separation is implemented within a unified computational domain while maintaining continuous motion integration. The combination sub-model is validated against experimental data and applied to investigate the effects of rotational speed on particle mixing in a horizontal drum. Additionally, the breakage sub-model is applied to investigate the particle breakage behaviors, according to the experimentally determined force-based binary (yes/no) decision criterion. The results show that rotational speed significantly influences the velocity distribution of multi-superquadric particles. A twofold increase in rotational speed (from 25 rpm to 50 rpm) reduces the mixing time by approximately 50 % and increases the transient breakage rate by 1.75 times. This study provides a robust modelling framework for analyzing complex non-spherical particle systems, offering new insights into particle breakage mechanisms and their impact on granular flows in industrial processes.

非球形颗粒在工程应用中广泛存在，但其不规则形状对离散元法（DEM）框架中的精确建模提出了挑战。本研究开发了一种新的多超二次粒子模型，该模型结合了亚粒子的组合和分离操作，能够模拟特定触发条件下的非球形粒子破碎。首次在统一的计算域内实现了分离后完整的多超二次粒子及其亚粒子的共存，同时保持了连续的运动积分。结合实验数据对组合子模型进行了验证，并应用该组合子模型研究了转速对水平转鼓内颗粒混合的影响。此外，根据实验确定的基于力的二元（yes/no）判定准则，采用破碎子模型研究颗粒的破碎行为。结果表明，转速对多次超二次粒子的速度分布有显著影响。转速增加一倍（从每分钟25转到每分钟50转），混合时间减少约50%，瞬时破碎率增加1.75倍。这项研究为分析复杂的非球形颗粒系统提供了一个强大的建模框架，为颗粒破碎机制及其对工业过程中颗粒流动的影响提供了新的见解。

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引用次数: 0

Parameter sensitivity in DEM of aggregates for road and construction materials 公路建筑材料集料DEM参数敏感性研究

IF 4.2 2区工程技术 Q2 ENGINEERING, CHEMICAL

Advanced Powder Technology

Pub Date : 2025-12-01 Epub Date: 2025-11-13 DOI: 10.1016/j.apt.2025.105116

Dong Feng

The discrete element method (DEM) is widely used in civil engineering and road engineering to simulate the motion and interaction of aggregate particles in pavement structures. Due to the interaction between particles, selecting or calibrating particle property input parameters is one of the critical issues in DEM implementation. The angle of repose (AOR) testing is a standard test method used to calibrate the overall behavior of simulated aggregates. In this study, AOR testing of coarse aggregate particles with SMA-11 gradation is modeled to investigate the effect of different parameters on the simulation results and to calibrate parameters. For this purpose, sensitivity analyses are performed for different factors, i.e., model object, AOR testing method, rolling friction coefficient, Young’s modulus, and surface energy. The results show that the selected Young’s modulus can be reduced by up to four orders of magnitude compared to the real Young’s modulus without affecting the simulation results. The model object, rolling friction coefficient, and surface energy are significant factors for determining the AOR, and the AOR testing method does not affect the parameter sensitivity. The conclusion indicates that investigation of sensitivity parameters facilitates the implementation of DEM applications for aggregate particles in road engineering.

离散元法（DEM）广泛应用于土木工程和道路工程中，用于模拟路面结构中骨料颗粒的运动和相互作用。由于粒子之间的相互作用，粒子属性输入参数的选择或标定是DEM实现中的关键问题之一。休止角（AOR）测试是一种标准的测试方法，用于校准模拟集料的整体性能。本研究对SMA-11级配的粗集料颗粒进行AOR试验，研究不同参数对模拟结果的影响，并对参数进行标定。为此，对模型对象、AOR试验方法、滚动摩擦系数、杨氏模量、表面能等不同因素进行敏感性分析。结果表明，与实际杨氏模量相比，所选杨氏模量可降低4个数量级，而不影响仿真结果。模型对象、滚动摩擦系数和表面能是决定AOR的重要因素，AOR测试方法不影响参数的灵敏度。研究结果表明，敏感性参数的研究有助于在道路工程中实现集料颗粒的DEM应用。

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引用次数: 0

Multi-physical field coupling analysis of the spontaneous combustion process in coal gangue hills influenced by slope profiles 受坡度影响的煤矸石山自燃过程多物理场耦合分析

IF 4.2 2区工程技术 Q2 ENGINEERING, CHEMICAL

Advanced Powder Technology

Pub Date : 2025-12-01 Epub Date: 2025-11-11 DOI: 10.1016/j.apt.2025.105111

Peng Wang , Shaochen Yang , Wencai Wang , Zhao Cao , Xuping Li , Yongdan Cao , Zhoukang Wu , Dawei Wang

Understanding the effects of different slope profiles on the spontaneous combustion of coal gangue hills is crucial for effective prevention and control. Unlike previous studies that primarily focused on temperature variations, this study developed a multiphysics coupling model integrating seepage velocity, oxygen concentration, and temperature fields to investigate the internal evolution of multiple fields during the spontaneous combustion process. Based on thermodynamic experiments, a zoning method was proposed using characteristic temperature points to delineate spontaneous combustion risk zones within coal gangue hills. The spatial distribution and formation mechanisms of combustion-prone areas were analyzed across hills with different slope profiles. The results show that when the coal gangue temperature reaches the T₂ point (336.82 °C), the material enters an accelerated oxidation stage, significantly increasing the risk of spontaneous combustion. Multiphysics simulation revealed that high-risk zones are primarily located in the mid-upper slope areas, with risk severity ranked as follows: arc-shaped > planar > corner > arched slopes. Additionally, under oblique wind conditions, the overall combustion risk for all slope types was reduced. The study found that the spontaneous combustion risk of coal gangue hills increases with stacking time at a decelerating rate, while the minimum safe accumulation rate exhibits exponential growth as stacking duration extends.

了解不同坡度对煤矸石山自燃的影响，对有效防治煤矸石山自燃具有重要意义。与以往主要关注温度变化的研究不同，本研究建立了一个综合渗流速度、氧浓度和温度场的多物理场耦合模型，以研究自燃过程中多场的内部演化。在热力学实验的基础上，提出了利用特征温度点划分煤矸石山自燃危险区的方法。分析了不同坡度丘陵易燃区的空间分布及其形成机制。结果表明：当煤矸石温度达到T2点（336.82℃）时，物料进入加速氧化阶段，自燃风险显著增加；多物理场模拟结果显示，高发区主要位于中上坡区，高发区风险等级依次为：弧形边坡；平面边坡；转角边坡；此外，在斜风条件下，所有坡度类型的总体燃烧风险都降低了。研究发现，煤矸石丘自燃风险随堆垛时间的增加呈减速增长趋势，最小安全堆积率随堆垛时间的延长呈指数增长趋势。

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引用次数: 0

Composite fiber of polyvinyl alcohol/activated carbon from corn cob prepared by electrospinning as a sustainable adsorbent for efficient rhodamine B adsorption 静电纺丝法制备聚乙烯醇/玉米芯活性炭复合纤维，作为高效吸附罗丹明B的可持续吸附剂

IF 4.2 2区工程技术 Q2 ENGINEERING, CHEMICAL

Advanced Powder Technology

Pub Date : 2025-12-01 Epub Date: 2025-11-07 DOI: 10.1016/j.apt.2025.105093

Adhi Setiawan, Sugeng Winardi, W. Widiyastuti

Rhodamine B (RB) is a synthetic dye commonly used in the textile industry, but its presence poses risks to health and the environment. Mitigating water pollution caused by synthetic dyes necessitates effective wastewater treatment methods. Therefore, this study aims to develop a simple, cost-effective, and environmentally friendly approach to synthesizing adsorbents by combining polyvinyl alcohol (PVA) and corn cob (CC)-based activated carbon (AC) through an electrospinning process to form PVA/AC composite fibers. The results showed that the increase in AC content in the composite fiber led to an enhancement in the adsorption performance against RB. PVA/AC composite fiber containing 10 % AC had a maximum adsorption capacity 5.41 times higher than PVA fiber and got a maximum 96.02 % RB removal efficiency. Adsorption isotherm analysis demonstrated compliance with the Langmuir model. Kinetic studies show that the pseudo-first-order (PFO) model best explains the adsorption process. Thermodynamic analysis also indicated that the adsorption was spontaneous and exothermic (ΔH° = −57.23 kJ/mol). Based on reusability tests, the adsorbent maintained a high removal efficiency, with RB removal decreasing marginally from 96.35 % to 78.93 % after five cycles. These results underscore the potential of PVA/AC composite fiber as an effective adsorbent for addressing water pollution caused by synthetic dyes.

罗丹明B （RB）是一种合成染料，通常用于纺织工业，但它的存在对健康和环境构成风险。减轻合成染料造成的水污染需要有效的废水处理方法。因此，本研究旨在开发一种简单、经济、环保的方法，将聚乙烯醇（PVA）和玉米芯（CC）基活性炭（AC）通过静电纺丝工艺合成PVA/AC复合纤维。结果表明，复合纤维中AC含量的增加导致复合纤维对RB的吸附性能增强。含10% AC的PVA/AC复合纤维的最大吸附量是PVA纤维的5.41倍，对RB的最大去除率为96.02%。吸附等温线分析表明符合Langmuir模型。动力学研究表明，伪一阶（PFO）模型最能解释吸附过程。热力学分析表明，吸附是自发的、放热的（ΔH°=−57.23 kJ/mol）。重复使用试验表明，该吸附剂保持了较高的去除效率，循环5次后，RB的去除率从96.35%略微下降至78.93%。这些结果强调了聚乙烯醇/AC复合纤维作为一种有效的吸附剂处理合成染料引起的水污染的潜力。

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引用次数: 0

DEM analysis of the media size ratio and agitator shaft geometry effects on grinding performance in a mixed-media stirred mill 混合介质搅拌磨中介质粒度比和搅拌轴几何形状对磨矿性能影响的DEM分析

IF 4.2 2区工程技术 Q2 ENGINEERING, CHEMICAL

Advanced Powder Technology

Pub Date : 2025-12-01 Epub Date: 2025-10-30 DOI: 10.1016/j.apt.2025.105090

Ryo Miyazawa , Hidehiro Kamiya , Kenichi Momota , Satoshi Shiina , Kyouko Okuyama , Yuma Hatakeyama , Chiharu Tokoro

The effects of media diameter ratio and agitation shaft geometry on grinding performance when using small and large media in a media stirred mill were experimentally investigated, and the mechanism and optimal configuration were elucidated through discrete element method simulations to reduce energy consumption by minimizing grinding time. The number ratio of large to small media was fixed at 1:1, the diameter of large media was fixed at 10 mm, and the diameter of small media was varied, namely 2, 3, and 5 mm. The highest grinding rate was experimentally obtained using 3 mm small media, consistent with the simulations. The simulations also showed that 2 mm small media passed through the gaps between the large media more easily and segregated at the ends of the mill, reducing both the collision energy and the grinding rate. Moreover, different agitator shaft geometries were evaluated, and the inclined agitator shaft facilitated the highest grinding rate by increasing the axial movement of the small media and the rate of high-energy collisions. Overall, the improve ratio of large to small media and an inclined agitator shaft can prevent small media segregation at both ends of the mill and thereby achieve the higher grinding rate.

通过实验研究了介质直径比和搅拌轴几何形状对大、小介质混合磨粉机研磨性能的影响，并通过离散元法模拟，阐明了介质直径比和搅拌轴几何形状对大、小介质混合磨粉机研磨性能的影响机理和优化配置，以最大限度地减少研磨时间，降低能耗。大、小介质的数量比固定为1:1，大介质的直径固定为10 mm，小介质的直径变化，即2、3、5 mm。实验结果表明，在3 mm小介质条件下，磨削速率最高，与模拟结果一致。模拟还表明，2mm的小介质更容易通过大介质之间的间隙并在磨机末端分离，从而降低了碰撞能量和磨速。此外，对不同的搅拌轴几何形状进行了评估，倾斜的搅拌轴通过增加小介质的轴向运动和高能碰撞率来促进最高的研磨率。总的来说，提高大、小介质比例和倾斜的搅拌轴可以防止磨机两端的小介质偏析，从而实现更高的磨矿率。

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引用次数: 0