Powder Technology最新文献_第6页

Optimization of pesticide droplet size distribution and analysis of drift reduction performance using a superhydrophobic baffle 超疏水挡板对农药滴度分布的优化及减漂性能分析

IF 4.6 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology

Pub Date : 2026-01-08 DOI: 10.1016/j.powtec.2026.122114

Ziyi Bo , Jingkun Han , Qishan Zhao , Shicheng Li , Shidong Xue , Zhong Lan , Xuehu Ma

During the pesticide spraying process, fine droplets are highly susceptible to wind-induced drift, resulting in substantial pesticide loss and potential ecological risks. To mitigate this issue, a superhydrophobic baffle is developed for drift reduction. By promoting droplets rebound, the baffles not only increase the collision-coalescence probability between fine droplets and larger ones—thereby improving the droplet size distribution—but also lower the trajectory height of fine droplets to promote their depositions. With these combined effects, the superhydrophobic baffles decrease droplet drift. Analysis of the optimized droplet size distribution reveals that the superhydrophobic baffle increased the volume median diameter of droplets generated by both hollow cone nozzle (TR80 015) and standard flat fan nozzle (ST110 015), while improving size distribution uniformity by up to 42.42%. Wind tunnel experimental data indicate that the optimal baffle angle for both nozzles is 45°, achieving a maximum average drift reduction rate of 45.83%. This study demonstrates that the proposed drift reduction technology, which leverages superhydrophobic baffles to accomplish a superior uniformity of droplet size distribution, offers a promising approach to enhancing the performance of existing spraying systems and supports reduced pesticide usage without compromising efficacy.

在农药喷洒过程中，细滴极易受到风致漂移的影响，造成大量农药损失和潜在的生态风险。为了缓解这一问题，开发了一种超疏水挡板来减少漂移。挡板通过促进液滴的回弹，不仅增加了细液滴与大液滴的碰撞聚并概率，从而改善了液滴的尺寸分布，而且降低了细液滴的轨迹高度，促进了其沉积。在这些综合作用下，超疏水挡板减少了液滴的漂移。优化后的液滴粒径分布分析表明，超疏水挡板增加了空心锥喷嘴（TR80 015）和标准扁平风扇喷嘴（ST110 015）生成的液滴体积中值直径，同时粒径分布均匀性提高了42.42%。风洞实验数据表明，两种喷嘴的最佳挡板角均为45°，最大平均减漂率为45.83%。这项研究表明，所提出的漂移减少技术，利用超疏水挡板来实现优越的液滴大小分布均匀性，为提高现有喷洒系统的性能提供了一种有前途的方法，并支持在不影响药效的情况下减少农药的使用。

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引用次数: 0

Flow characterisation and discharge rate prediction of wheat seed particles in wedge-shaped hoppers 小麦种子颗粒在楔形料斗内的流动特性及流量预测

IF 4.6 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology

Pub Date : 2026-01-07 DOI: 10.1016/j.powtec.2026.122125

Jianhua Fan , Daizhe Yang , Qingyang Xu , Lu Wang , Zhiwu Han , Jianqun Yu

The discharge of wheat seed particles from a wedge-shaped hopper are investigated using the discrete element method. The effect of hopper angle, sliding friction coefficients of particle-particle and particle-wall on the flow behaviour and discharge rate are systematically analysed. The results show that the discharge rate generally decreases with the hopper angle. However, the discharge rate at a hopper angle of

90^{°}

is higher than that at

75^{°}

due to the formation of stagnant zones. It is found that the discharge rate reduction for the outlet width

W_{o}

= 10 mm is attributed to two factors. One is the enhancement of normal forces due to the increase in the particle-particle friction. Another is the reduction in average particle velocity caused by the particle-wall friction. For hopper angel

α

=

15^{°}

, particle-wall friction plays a dominant role in the discharge rate reduction, with a contribution of 57.42%, compared to the 28.81% reduction caused by particle-particle friction. Both friction parameters contribute equally to the rate reduction at

α

=

75^{°}

and

90^{°}

. For

W_{o}

> 40 mm, the coefficient of friction between particles has a significant effect on the empirical parameter. A new expression for the factor

C

in the Beverloo equation is proposed by introducing an empirical modification. This revised formula provides accurate predictions of the mass discharge rate by integrating the hopper angle and friction parameters of particle-particle and particle-wall. Finally, the validity of this correlation is verified experimentally with a maximum error of 7.7%. The results offer a valuable reference for predicting discharge behaviour for varying particle properties and hopper geometries.

采用离散元法研究了小麦种子颗粒从楔形料斗中排出的过程。系统分析了料斗角、颗粒-颗粒和颗粒-壁面滑动摩擦系数对流动特性和流量的影响。结果表明，随着料斗角度的增大，出料速率总体上减小。但在漏斗角度为90°时，由于形成滞流区，排料速率高于75°时的排料速率。研究发现，出口宽度为Wo = 10 mm时，出料率降低主要由两个因素引起。一是由于粒子间摩擦力的增加，法向力的增强。另一个原因是由于颗粒与壁面摩擦引起的平均颗粒速度的降低。当料斗倾角α = 15°时，颗粒壁面摩擦对卸料率降低的贡献率为57.42%，颗粒壁面摩擦对卸料率降低的贡献率为28.81%。在α = 75°和90°时，这两个摩擦参数对速率降低的贡献相同。对于Wo >； 40 mm，颗粒间摩擦系数对经验参数有显著影响。通过引入经验修正，提出了贝弗罗方程中因子C的新表达式。修正后的公式通过综合料斗角度和颗粒-颗粒和颗粒-壁的摩擦参数，提供了质量排出率的准确预测。最后，通过实验验证了该相关性的有效性，最大误差为7.7%。结果为预测不同颗粒性质和料斗几何形状的放电行为提供了有价值的参考。

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引用次数: 0

Computational evaluation of viscosity under microstructural uncertainties for the continuum model of sintering 烧结连续介质模型微观结构不确定性下粘度的计算评价

IF 4.6 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology

Pub Date : 2026-01-06 DOI: 10.1016/j.powtec.2026.122119

Farid Rabiei Motmaen, Christian Brandl, Tesfaye Molla

The Continuum Theory of Sintering (CTS), which models the sintering body as a viscous medium, is widely used to simulate the behaviour of materials during sintering. However, its application in optimizing industrial sintering processes is often limited by the lack of key material parameters, particularly the viscosity of the sintering body. Most available viscosity models are also derived by considering idealized microstructures, limiting the predictive capability of the CTS. In this work, we present a computational framework for evaluating the viscosity of sintering bodies by explicitly incorporating their evolving microstructure during the sintering process. The approach integrates discrete element method (DEM) simulations with microstructural characterization, reconstruction, and homogenization. Simulated microstructure at a given density is characterized using multiple state variables, which are used to generate statistically equivalent microstructures. These are then used to define Boundary Value Problems (BVPs) for evaluating the effective properties and their associated uncertainties. Application of the method to the sintering of 316 L stainless steel powders demonstrates its ability to capture experimental data, while also enabling the assessment of existing viscosity models, particularly in relation to the evolving particle size. The results underscore the impact of pore morphologies, which can lead to variations in macroscopic viscosities by up to 145 % compared to existing models. The proposed framework links microstructural evolution of sintering bodies to their macroscopic properties, offering an efficient alternative to costly experimental methods. It also enables the routine application of the CTS for optimizing sintering cycles, thereby contributing to the development of advanced materials.

烧结连续介质理论（CTS）将烧结体建模为一种粘性介质，被广泛用于模拟材料在烧结过程中的行为。然而，它在优化工业烧结工艺中的应用往往受到缺乏关键材料参数，特别是烧结体粘度的限制。大多数可用的粘度模型也是通过考虑理想化的微观结构推导出来的，这限制了CTS的预测能力。在这项工作中，我们提出了一个计算框架，通过明确地结合烧结过程中烧结体的微观结构演变来评估烧结体的粘度。该方法将离散元法（DEM）模拟与微观结构表征、重建和均质化相结合。在给定密度下，模拟微观结构使用多个状态变量来表征，这些状态变量用于生成统计等效的微观结构。然后用这些来定义边值问题（BVPs），以评估有效性质及其相关的不确定性。将该方法应用于316l不锈钢粉末的烧结，证明了其捕获实验数据的能力，同时也能够评估现有的粘度模型，特别是与不断变化的粒度有关的模型。结果强调了孔隙形态的影响，与现有模型相比，孔隙形态可以导致高达145%的宏观粘度变化。提出的框架将烧结体的微观结构演变与其宏观性质联系起来，为昂贵的实验方法提供了一种有效的替代方法。它还使CTS的常规应用优化烧结周期，从而有助于先进材料的发展。

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引用次数: 0

Climbing dynamics of fine cohesive powders in a granular vibration pumping system 颗粒振动泵送系统中粘性细粉的爬升动力学

IF 4.6 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology

Pub Date : 2026-01-06 DOI: 10.1016/j.powtec.2026.122117

Mohammadhossein Shahsavari , Matthias Sperl , Daniela Zander , Kenta Shirode , Sota Suzuki , Masato Adachi

A granular vibration pumping system, which employs granular capillary action in a vibrating pipe, is a promising method for vertically transporting powders in dusty environments, such as the lunar surface. This study aimed to experimentally investigate the lifting performance of the system for fine cohesive particles and characterize the unique climbing behaviors, including fluidization and decompaction phenomena. The experiments showed that climbing initiated when the dimensionless vibration strength reached approximately Γ ≈ 5, enabling the upward transport of cohesive glass beads smaller than 20 μm and those of 38–53 μm, which reached maximum heights of about 200 mm and 400 mm, respectively. However, when the vibration strength exceeded approximately Γ ≈ 10, the climbing performance declined due to excessive fluidization. Based on the concepts of compaction and decompaction, the particles ascended in the pipe when fluidized under increasing vibration intensity (in the static fracture (SF) and convection fracture (CF) regions) but could not climb in the consolidation (CS) region, where compaction occurred and fluidization did not occur under lower intensity. With a further increase in vibration intensity, the particles became excessively fluidized and ceased to ascend in the dynamic fracture (DF) region as the interparticle network required for climbing was lost.

颗粒振动泵送系统利用振动管中的颗粒毛细作用，是一种在多尘环境（如月球表面）垂直输送粉末的有前途的方法。本研究旨在实验研究该系统对细小粘性颗粒的提升性能，并表征其独特的爬升行为，包括流化和分解现象。实验结果表明，当无量纲振动强度达到Γ≈5左右时，开始发生攀爬，使得小于20 μm和38 ~ 53 μm的粘性玻璃微珠向上运移，最大高度分别达到200 mm和400 mm左右。但当振动强度超过Γ≈10左右时，由于过度流化，爬升性能下降。基于压实和分解的概念，增大振动强度（静断裂（SF）和对流断裂（CF）区域）时，颗粒在管道内流化时上升，但在固结（CS）区域不能爬升，在较低强度下，管道内发生压实而不发生流化。随着振动强度的进一步增加，颗粒变得过度流化，在动态裂缝（DF）区停止上升，因为失去了攀登所需的颗粒间网络。

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引用次数: 0

Fragmentation behavior of wet agglomerates in granular shear flow: A discrete element method study 湿团聚体在颗粒剪切流中的破碎行为：离散元法研究

IF 4.6 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology

Pub Date : 2026-01-06 DOI: 10.1016/j.powtec.2026.122118

Jialiang Cai, Jiliang Ma, Xiaoping Chen, Daoyin Liu, Cai Liang

Granular shear flow refers to a granular flow characterized by a velocity gradient. In this flow, particles move in a simple shear pattern. However, the fundamental mechanisms responsible for the fragmentation of wet agglomerates within granular shear flow are not yet fully understood. This study uses the discrete element method (DEM) combined with liquid bridge and drag force models to analyze the fragmentation behavior of wet agglomerates in granular shear flows. The drag force model is first validated against experimental terminal velocity data. The research then explores how shear rate, liquid content, and solid volume fraction in granular shear flows affect agglomerate fragmentation. Using fractal theory, the study examines changes in the gyration radius and fractal dimension of the largest fragments. A regime map is developed by integrating the dimensionless number (П_s) with liquid content to predict fragmentation behavior. The key results include the identification of three fragmentation stages—erosion, deformation, and fragmentation—with deformation marked by an increase in gyration radius ratio and a decrease in fractal dimension, indicating structural breakdown. Higher shear rates and increased solid volume fractions promote fragmentation, which reduces the average liquid bridge force and the coordination number of agglomerates. Conversely, higher liquid content enhances shear resistance, thereby suppressing breakage. Finally, fragmentation is categorized into deformation, mild fragmentation, and complete fragmentation regimes based on the total fragmentation index. The ratio of granular shear flow intensity to the cohesive force of agglomerates (П_s), along with the liquid content, serves as a predictive parameter in the regime map.

颗粒剪切流是指以速度梯度为特征的颗粒流。在这种流动中，粒子以简单的剪切模式运动。然而，湿团聚体在颗粒剪切流中破碎的基本机制尚不完全清楚。本研究采用离散元法（DEM）结合液桥模型和阻力模型对湿团聚体在颗粒剪切流中的破碎行为进行了分析。阻力模型首先与实验终端速度数据进行了验证。然后研究了颗粒剪切流中的剪切速率、液体含量和固体体积分数如何影响团聚体破碎。利用分形理论，研究了最大碎片的旋转半径和分形维数的变化。通过将无因次数（Пs）与液体含量相结合，建立了一个状态图来预测破碎行为。主要研究结果包括确定了侵蚀、变形和破碎三个破碎阶段，其中变形以旋转半径比增大和分形维数减小为特征，表明构造破碎。更高的剪切速率和更高的固体体积分数促进了破碎，从而降低了平均液桥力和团聚体的配位数。反之，较高的液体含量会增强抗剪能力，从而抑制断裂。最后，根据破碎总指数将破碎分为变形破碎、轻度破碎和完全破碎三种类型。颗粒剪切流动强度与团聚体黏结力之比（Пs）与液体含量一起作为状态图中的预测参数。

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引用次数: 0

Predicting the packing fraction of polydisperse particles: A binary sphere decomposition method 预测多分散颗粒的堆积率：二元球分解法

IF 4.6 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology

Pub Date : 2026-01-06 DOI: 10.1016/j.powtec.2026.122120

Shuixiang Li , Shixuan Zhang

We demonstrate that a polydisperse sphere packing can be decomposed into binary sphere subsystems sharing the same equivalent packing diameter. Nonspherical particles can be effectively represented by a binary sphere system with identical equivalent packing diameter and packing fraction. Consequently, a polydisperse packing of nonspherical particles can be transformed into a polydisperse sphere packing, which can be further decomposed into binary sphere subsystems. We propose a universal method for predicting the packing fraction of both polydisperse spherical and nonspherical particles using the linear superposition principle. The method is based on the equivalent packing diameters and packing fractions of binary spheres and monodisperse nonspherical particles. An iterative algorithm is developed to decompose polydisperse spheres and determine equivalent packing diameter. Notably, the proposed approach requires no empirical fitting parameters and is practically precise. Numerical examples confirm its high accuracy in predicting packing fractions for both size- and shape-disperse particles. This method effectively reduces the dimensionality and complexity of the packing fraction estimation for polydisperse particles to that of binary spheres.

证明了多分散球体填料可以分解为具有相同等效填料直径的二元球体子系统。非球形粒子可以用等效充填直径和充填分数相同的二元球体系统有效地表示。因此，非球形粒子的多分散填料可以转化为多分散球体填料，而多分散球体填料又可以进一步分解为二元球体子系统。我们提出了一种用线性叠加原理预测多分散球形和非球形颗粒堆积分数的通用方法。该方法基于二元球形和单分散非球形颗粒的等效堆积直径和堆积分数。提出了一种分解多分散球体并确定等效填料直径的迭代算法。值得注意的是，所提出的方法不需要经验拟合参数，实际上是精确的。数值算例证实了该方法对大小分散颗粒和形状分散颗粒的堆积分数预测具有较高的准确性。该方法有效地降低了多分散颗粒堆积率估计的维数和复杂度，降低了二元球堆积率估计的维数和复杂度。

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引用次数: 0

Numerical simulation of impact and dispersion characteristics of smoke screen particles in dual-nozzle pneumatic spraying systems based on CFD-DDPM-DEM coupling 基于CFD-DDPM-DEM耦合的双喷嘴气动喷涂烟幕颗粒冲击与分散特性数值模拟

IF 4.6 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology

Pub Date : 2026-01-05 DOI: 10.1016/j.powtec.2025.122111

Liang Chen , Tao Shen , Xiaowei Shen , Lianfeng Wang , Liang Guo , Di Wang , Xiao Peng , Kainan Liu

This study employs the dense discrete phase model (DDPM) within the Eulerian-Lagrangian framework, coupled with the particle collision model from the discrete element model (DEM), to numerically simulate the impact and diffusion characteristics of smoke particles in dual-nozzle pneumatic spray. The focus is on investigating the flow field evolution mechanism and the effects of nozzle angle, spacing, and initial gas velocity (Reynolds number) on diffusion characteristics. The results show that the dual-nozzle impinging flow field consists of a central region (upward flow, radial diffusion flow) and a peripheral region (symmetric vortices, recirculation flow), which together regulate the diffusion speed, area, and concentration distribution of smoke particles. A nozzle angle of 90° achieves the optimal balance between vertical and radial diffusion. Increasing the spacing alters the concentration distribution characteristics in the collision zone. Although increasing the initial gas velocity (Reynolds number) accelerates diffusion, it reduces the uniformity of the concentration distribution. This study provides a theoretical basis for the optimization of spray system parameters and the controllable release of smoke, and also offers a practical case for the CFD-DDPM-DEM coupled model.

本研究采用欧拉-拉格朗日框架下的密集离散相模型（DDPM），结合离散元模型（DEM）中的粒子碰撞模型，对双喷嘴气动喷雾中烟雾粒子的碰撞和扩散特性进行了数值模拟。重点研究了流场演化机理以及喷嘴角度、喷嘴间距和初始气体速度（雷诺数）对扩散特性的影响。结果表明：双喷嘴碰撞流场由中心区域（向上流动、径向扩散流）和外围区域（对称涡、再循环流）组成，它们共同调节烟雾颗粒的扩散速度、面积和浓度分布。90°的喷嘴角达到了垂直扩散和径向扩散的最佳平衡。增大间距改变了碰撞区的浓度分布特征。初始气体速度（雷诺数）的增加虽然加速了扩散，但降低了浓度分布的均匀性。该研究为喷雾系统参数的优化和烟雾的可控释放提供了理论依据，也为CFD-DDPM-DEM耦合模型提供了实践案例。

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引用次数: 0

Particle-scale modelling of mechanical and fracture behaviour of recycled aggregate concrete with an initial defect using DEM 使用DEM对具有初始缺陷的再生骨料混凝土的力学和断裂行为进行颗粒尺度建模

IF 4.6 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology

Pub Date : 2026-01-05 DOI: 10.1016/j.powtec.2026.122115

Haiyang Zhao, Annan Zhou

Defects within recycled aggregate concrete (RAC) can significantly compromise its mechanical performance. To investigate how an initial defect affects the mechanical behaviour of RAC, this study develops a 3D discrete element model (DEM) of RAC containing a cuboid defect. The defect is characterised with normalised depth (0.08–1.0), length (0.08–0.64), width (0.02–0.08) and inclination angle (0–90 degree). The DEM results show that both the elastic modulus and compressive strength of RAC decrease approximately linearly with increasing defect size. In contrast, the mechanical properties gradually increase as the defect angle increases. The reduction in elastic modulus is primarily associated with the defect's projected area along the loading direction, whereas the loss in compressive strength is influenced by both the projection and overall defect size. Stress concentration is mainly determined by the defect geometry and is also influenced by the presence of high-stiffness aggregates. Crack growth initiates predominantly within the interfacial transition zones (ITZs) and new mortar. Based on the DEM results, analytical equations are proposed to interpret the relationships between RAC mechanical properties and the defect characteristics. These equations enable prediction of the mechanical properties of RAC containing a defect with various geometries and RAC with multiple irregular defects. The findings provide guidance for defect-informed structural assessment and design, supporting serviceability and safety in sustainable infrastructure applications.

再生骨料混凝土（RAC）内部缺陷严重影响其力学性能。为了研究初始缺陷如何影响RAC的力学行为，本研究开发了包含长方体缺陷的RAC的3D离散元素模型（DEM）。缺陷的特征是归一化深度（0.08-1.0），长度（0.08-0.64），宽度（0.02-0.08）和倾角（0-90度）。数值模拟结果表明，随着缺陷尺寸的增大，RAC的弹性模量和抗压强度近似呈线性下降。随着缺陷角度的增大，材料的力学性能逐渐提高。弹性模量的减少主要与缺陷沿加载方向的投影面积有关，而抗压强度的损失则受投影和总体缺陷尺寸的影响。应力集中主要由缺陷的几何形状决定，也受高刚度骨料存在的影响。裂纹扩展主要发生在界面过渡区和新砂浆内。在此基础上，提出了RAC力学性能与缺陷特征之间关系的解析方程。这些方程能够预测含有不同几何形状缺陷的RAC和具有多个不规则缺陷的RAC的力学性能。研究结果为结构缺陷评估和设计提供了指导，支持可持续基础设施应用的可维护性和安全性。

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引用次数: 0

Characterising the shear rate in granular materials using advanced coarse-graining approaches 用先进的粗粒化方法表征颗粒材料的剪切速率

IF 4.6 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology

Pub Date : 2026-01-05 DOI: 10.1016/j.powtec.2025.122101

Taswald Llewelyn Moodley , Indresan Govender

This study compares two coarse-graining approaches — Artoni and Richard (2015) and Rycroft et al. (2009) — using statistically validated DEM (Discrete Element Method) simulation data and experimental PEPT (Positron Emission Particle Tracking) measurements. DEM and PEPT are fundamentally different in the type of data they provide: DEM data is Eulerian, covering the entire flow field, while PEPT is Lagrangian, tracking the trajectory of individual particles. The coarse-graining methods used also differ in their approaches, with Artoni and Richard spreading each grain’s effect smoothly via a distance-weighted kernel, and the Rycroft method being devoid of any smoothing kernel, instead relying on a least-squares regression. The primary objective of this study is to determine the suitability of each coarse-graining scheme based on the data source — whether DEM or PEPT — and to statistically compare the resultant shear rate continuum fields. By using previously validated high resolution DEM and PEPT data (Moodley and Govender, 2022), we assess the impact of kernel-based and kernel-free coarse-graining methods on shear rate computation. This work contributes to refining continuum descriptions for practical applications by identifying optimal coarse-graining strategies depending on the nature of the underlying data. The shear rate tensor is evaluated in terms of axial and shear components, revealing how coarse-graining choices affect different components of flow behaviour. This research thus bridges the gap between Lagrangian and Eulerian data handling in granular flow studies, enabling accurate modelling of continuum fields in a variety of industrial processes.

本研究比较了两种粗粒度方法- Artoni和Richard（2015）和Rycroft等人(2009)-使用统计验证的DEM（离散元法）模拟数据和实验PEPT（正电子发射粒子跟踪）测量。DEM和PEPT提供的数据类型有本质的不同：DEM是欧拉数据，覆盖整个流场，而PEPT是拉格朗日数据，跟踪单个粒子的轨迹。使用的粗粒度方法在方法上也有所不同，Artoni和Richard通过距离加权核平滑地扩散每个颗粒的效果，而Rycroft方法没有任何平滑核，而是依赖于最小二乘回归。本研究的主要目的是确定基于数据源（无论是DEM还是PEPT）的每种粗粒化方案的适用性，并对所得剪切率连续体场进行统计比较。通过使用先前验证的高分辨率DEM和PEPT数据（Moodley和Govender， 2022），我们评估了基于核和无核的粗粒化方法对剪切速率计算的影响。这项工作通过根据底层数据的性质确定最佳粗粒度策略，有助于为实际应用改进连续体描述。剪切速率张量根据轴向和剪切分量进行评估，揭示粗粒化选择如何影响流动行为的不同分量。因此，这项研究弥合了颗粒流研究中拉格朗日和欧拉数据处理之间的差距，从而能够在各种工业过程中对连续介质场进行精确建模。

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引用次数: 0

Flotation response of parisite, monazite, bastnäsite and synchysite from a carbonatite deposit 某碳酸盐矿床中parisite、monazite、bastnäsite和synchyite的浮选响应

IF 4.6 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology

Pub Date : 2026-01-02 DOI: 10.1016/j.powtec.2025.122112

Ezgi Akyildiz, Camilo M. Silva, Kornel Tobiczyk, Stefanie Lode , Kurt Aasly, Przemyslaw B. Kowalczuk

The European Green Deal targets a carbon-neutral, resource-efficient economy by 2050. Rare earth elements (REE) are essential to this transition, especially for green energy technologies. However, rising demand and supply concerns have prompted research into REE mining and processing. This study focuses on flotation behavior of rare earth minerals (REM), particularly parisite, monazite and bastnäsite, synchysite from a Norwegian carbonatite deposit.

REM (parisite, bastnäsite, monazite, synchysite) were tracked throughout the beneficiation process using ICP-MS and SEM-based automated mineralogy. Results showed 72 % recovery of total rare earth oxides (REO) with a 48 wt% REO grade in the final concentrate. The second cleaner step yielded a concentrate with 39 wt% parisite (72 % recovery), 14 wt% bastnäsite (75 % recovery), 8 wt% monazite (70 % recovery), and 4 wt% synchysite (69 % recovery).

In this study, mineral association patterns of major REM subtypes (parisite-Ce, parisite-Ce-La, monazite-Ce, bastnäsite-Ce-La, and synchysite-Ce) were analyzed across all beneficiation products and the feed. The mineral association analysis revealed that parisite-Ce and bastnäsite-Ce-La had similar trends, while monazite-Ce was associated with apatite and barite, reflecting its geochemical origin. Synchysite-Ce had the highest intergrowth with other REM and the lowest liberation. Nevertheless, all target minerals exhibited a sufficient surface exposure to be successfully recovered in the final concentrate, meeting the requirements for a marketable REM concentrate.

The study offers critical mineralogical insights into REM flotation, particularly the underexplored parisite, supporting future beneficiation strategies for carbonatite-hosted REE deposits.

《欧洲绿色协议》的目标是到2050年实现碳中和、资源节约型经济。稀土元素（REE）对这一转变至关重要，尤其是对绿色能源技术而言。然而，日益增长的需求和供应担忧已促使对稀土开采和加工的研究。本文研究了挪威某碳酸岩矿床中稀土矿物（REM）的浮选行为，特别是parisite， monazite和bastnäsite， synchyite。在整个选矿过程中，使用ICP-MS和sem自动化矿物学技术跟踪了REM （parisite, bastnäsite, monazite, synchysite）。结果表明，最终精矿中总稀土氧化物（REO）回收率为72%，REO品位为48%。第二个清洁步骤产生的精矿含有39 wt%的parisite（回收率为72%），14 wt%的bastnäsite（回收率为75%），8 wt%的monazite（回收率为70%）和4 wt%的synchysite（回收率为69%）。在本研究中，分析了所有选矿产品和饲料中主要REM亚型（巴黎石- ce、巴黎石- ce - la、独居石- ce、bastnäsite-Ce-La和合石- ce）的矿物组合模式。矿物组合分析表明，巴黎石- ce与bastnäsite-Ce-La具有相似的趋势，而独居石- ce与磷灰石和重晶石具有相似的趋势，反映了其地球化学成因。Synchysite-Ce与其他REM的互生率最高，解离率最低。然而，所有目标矿物都显示出足够的地表暴露，可以在最终精矿中成功回收，满足可销售的REM精矿的要求。该研究为快速动眼矿物浮选提供了重要的矿物学见解，特别是未勘探的parisite，支持未来碳酸盐型稀土矿床的选矿策略。

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