Powder Technology最新文献_第5页

Large-scale multiple-GPU DEM simulation of polyhedral particle systems 多面体粒子系统的大规模多gpu DEM模拟

IF 4.6 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology

Pub Date : 2026-01-12 DOI: 10.1016/j.powtec.2026.122132

Jiayu Xu , Shuai Zhang , Yong Zhang , Haolei Zhang , Ji Xu , Wei Ge

Polyhedral particles are ubiquitous in natural and industrial processes. Recent advances in GPU computing have greatly enhanced the feasibility of discrete element method (DEM) simulations for polyhedral particles, yet accurately simulating their collective behavior remains computationally intensive for large-scale simulations. In this study, a distributed parallel DEM simulation framework with multiple-GPU computing for polyhedral particles is developed to achieve high-performance large-scale simulations. The framework integrates the Message Passing Interface (MPI) with NVIDIA's Compute Unified Device Architecture (CUDA), in which the main compute pipeline, including domain decomposition, neighbor-list construction, contact search, and evaluation of contact, is executed on GPUs. The proposed method is validated through both numerical and experimental studies. Numerical stability is verified through simulations of particle–wall impact and wall force evaluation at different mesh resolutions. The simulated static packing structures and velocity fields in a quasi-two-dimensional rotating drum show good agreement with experimental measurements. A scalability test involving 2 × 10⁷ polyhedral particles on 16 GPUs demonstrates excellent parallel performance, achieving a 14.8 times speedup compared with the single-GPU case. Moreover, the large-scale applications, e.g., the silo deposition and fixed bed containing cylindrical catalyst particles, further demonstrate the capability of the proposed framework for industrial-scale applications.

多面体粒子在自然和工业过程中无处不在。GPU计算的最新进展极大地提高了离散元法（DEM）模拟多面体粒子的可行性，但准确地模拟它们的集体行为对于大规模模拟来说仍然是计算密集型的。本研究开发了一种多gpu计算的多面体粒子分布式并行DEM仿真框架，以实现高性能的大规模模拟。该框架将消息传递接口（MPI）与NVIDIA的计算统一设备架构（CUDA）集成在一起，其中主要的计算管道，包括域分解，邻居列表构建，接触搜索和接触评估，都在gpu上执行。通过数值和实验验证了该方法的有效性。通过模拟不同网格分辨率下的颗粒-壁面碰撞和壁面力评估，验证了数值稳定性。模拟的准二维旋转滚筒的静态填料结构和速度场与实验结果吻合较好。在16个gpu上进行的涉及2 × 107多面体粒子的可扩展性测试显示了出色的并行性能，与单gpu情况相比，实现了14.8倍的加速。此外，大规模应用，例如筒仓沉积和含有圆柱形催化剂颗粒的固定床，进一步证明了所提出的框架具有工业规模应用的能力。

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引用次数: 0

Challenges in the recycling process of spent lithium-ion batteries: Sustainable recycling of low-value materials – A review 废锂离子电池回收过程中的挑战：低价值材料的可持续回收-综述

IF 4.6 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology

Pub Date : 2026-01-12 DOI: 10.1016/j.powtec.2026.122140

Xin-long Li , Xiang-nan Zhu , Xiao-tian Zhao , Guang-liang Wei , Chun-liu Hu , Wen-hao Gao , Chun-chen Nie , Shuai Yan , Lin-han Ge

In the context of global carbon neutrality, the valuable metals found in spent lithium-ion batteries (LIBs) are often overshadowed by non-metals—low-value materials (LVMs) such as graphite and electrolytes, which constitute 30–50% of the battery mass. These materials lack established profit pathways and systematic reviews. This paper proposes, for the first time, a comprehensive framework for the high-value transformation of LVMs, integrating the three key stages of separation, upgrading, and derivation to address the current literature gap that has focused solely on the recovery of transition metals. Firstly, the LVMs in spent LIBs was analyzed, and their diverse separation methods were summarized. Subsequently, based on their working principles, the enrichment, indirect recycling, and modification of LVMs were outlined, along with functional materials such as derived nano-graphene and catalysts for laboratory-scale demonstration. Next, the characteristic parameters, performance, and key differences in the LVMs recovery process were discussed and compared, along with a summary of the separation and technological innovations related to LVMs. Finally, a preliminary framework for the cost-effective recovery of a new generation of spent LVMs, emphasizing energy savings and environmental protection, is presented. This framework provides an actionable solution for the large-scale high-value recycling of non-metal components in LIBs and offers policymakers in the circular economy a new perspective that extends beyond metal dependency.

在全球碳中和的背景下，废旧锂离子电池（lib）中发现的有价值金属通常被非金属低价值材料（lvm）所掩盖，如石墨和电解质，它们占电池质量的30-50%。这些材料缺乏既定的盈利途径和系统的审查。本文首次提出了lvm高价值转化的综合框架，整合了分离、升级和衍生三个关键阶段，以解决目前仅关注过渡金属回收的文献空白。首先对废lib中的lvm进行了分析，并对其不同的分离方法进行了总结。随后，根据其工作原理，概述了lvm的富集，间接回收和改性，以及衍生纳米石墨烯等功能材料和实验室规模演示的催化剂。接下来，讨论和比较了lvm回收过程的特征参数、性能和主要差异，并总结了与lvm相关的分离和技术创新。最后，提出了以节能和环保为重点的新一代废lvm的成本效益回收的初步框架。该框架为lib中非金属组件的大规模高价值回收提供了一个可行的解决方案，并为循环经济的政策制定者提供了一个超越金属依赖的新视角。

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引用次数: 0

Performance, hydration, and environmental impact of a ternary all-solid-waste binder: Roles of ground granulated blast furnace slag, basic oxygen furnace slag, and calcium carbide residue 三元全固废粘结剂的性能、水化和环境影响：磨粒高炉渣、碱性氧炉渣和电石渣的作用

IF 4.6 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology

Pub Date : 2026-01-11 DOI: 10.1016/j.powtec.2026.122133

Liang Li , Zhipeng Wu , Changming Hu , Guochen Wang , Henghui Fan , Peng Zhang , Mintae Kim

Using industrial solid waste to prepare cementitious materials and partially replace cement can reduce carbon emissions. However, commercial alkali activators may account for over 50% of the production cost. This study developed a novel all-solid-waste binder using calcium carbide residue (CCR) as a green alkaline activator, basic oxygen furnace slag (BOFS), and ground granulated blast furnace slag (GGBS) as pozzolanic components, named CBG binders. The effects of CCR dosage and BOFS/GGBS mass ratio on the workability, mechanical, and rheological properties were systematically studied. Further, the phase composition, microscopic morphology, and hydration mechanism were elucidated through XRD, SEM-EDS, and FT-IR tests. The results show that when the CCR dosage is 20% and the BOFS/GGBS is 2:8, the compressive strength of the CBG binders reaches its maximum at 3 d, 7 d, and 28 d, which are 8.5 MPa, 16 MPa, and 32.1 MPa, respectively. Reducing the CCR dosage decreases the yield stress, plastic viscosity, and thixotropy, whereas lowering the BOFS/GGBS increases these rheological parameters. CCR, BOFS, and GGBS exhibit complementary effects during the hydration reaction process. The rapid hydration of Ca(OH)₂ in CCR provides Ca²⁺ and OH⁻, enabling the alkali activation reaction between BOFS and GGBS to form C-S-H gel, which fills the pores, densifies the structure, and improves the mechanical properties. Life cycle assessment indicates that the optimal CBG binder achieves approximately an 88% reduction in carbon intensity (kg CO₂-eq per ton per MPa) compared to cement.

利用工业固体废弃物制备胶凝材料，部分替代水泥，可以减少碳排放。然而，商业碱活化剂可能占生产成本的50%以上。本研究以电石渣（CCR）为绿色碱性活化剂，碱性氧炉渣（BOFS）和磨粒高炉渣（GGBS）为火山灰组分，研制了一种新型全固废粘结剂，称为CBG粘结剂。系统研究了CCR用量和BOFS/GGBS质量比对可加工性、力学性能和流变性能的影响。通过XRD、SEM-EDS、FT-IR等测试手段对其物相组成、微观形貌及水化机理进行了分析。结果表明：当CCR用量为20%，BOFS/GGBS为2:8时，CBG粘结剂的抗压强度在第3天、第7天和第28天达到最大值，分别为8.5 MPa、16 MPa和32.1 MPa；减少CCR用量会降低屈服应力、塑性粘度和触变性，而降低BOFS/GGBS则会增加这些流变参数。CCR、BOFS和GGBS在水化反应过程中表现出互补效应。Ca(OH)2在CCR中的快速水化提供了Ca2+和OH−，使BOFS和GGBS之间的碱活化反应形成C-S-H凝胶，填充孔隙，使结构致密，提高了力学性能。生命周期评估表明，与水泥相比，最佳CBG粘结剂的碳强度（每吨每MPa千克二氧化碳当量）降低了约88%。

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引用次数: 0

Micromechanical interpretation of fines content effect on the K0-value of granular soils 细粒含量对颗粒土k0值影响的微观力学解释

IF 4.6 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology

Pub Date : 2026-01-11 DOI: 10.1016/j.powtec.2026.122129

Chi Zhang , Tao Zhang

Fines content effect on the coefficient of earth pressure at rest K₀ in binary granular soils was systematically investigated using the DEM. Results reveal a non-monotonic variation in K₀ during virgin loading, initially decreasing to a minimum at 30% fines content before increasing with further fines addition. This macro-scale trend correlates inversely with the evolution of the peak friction angle. Significant hysteresis observed during unloading-reloading cycles demonstrates the development of locked-in horizontal stresses, underscoring the soil memory of its stress history. Microscopic analysis establishes that the macroscopic K₀ is fundamentally governed by the evolution of fabric anisotropy. At low fines content, fines reinforce the coarse skeleton, intensifying force chain anisotropy and minimizing K₀. Beyond the threshold, fines disrupt the load-bearing skeleton, causing fabric homogenization and increasing K₀. The anisotropy of normal contact forces is identified as the dominant micromechanical factor, a finding validated through the derived stress-force-fabric relationship. This research provides critical micromechanical insights into the fines-dependent transition in K₀ behavior.

利用DEM系统研究了细粒含量对二元颗粒土静息K0土压力系数的影响。结果表明，在初始加载期间，K0呈非单调变化，在细粉含量为30%时，K0最初降至最低，然后随着细粉的添加而增加。这种宏观趋势与峰值摩擦角的演变成反比。在卸载-再加载循环过程中观察到的显著滞后表明了锁定水平应力的发展，强调了其应力历史的土壤记忆。微观分析表明，宏观K0从根本上受织物各向异性演化的支配。低细粒含量时，细粒强化粗骨架，强化力链各向异性，使K0最小。超过阈值，细粒会破坏承重骨架，导致织物均匀化并增加K0。法向接触力的各向异性被确定为主要的微力学因素，这一发现通过推导的应力-力-织物关系得到验证。这项研究为K0行为中精细依赖的转变提供了关键的微观力学见解。

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引用次数: 0

Synthesis of xonotlite insulation whiskers by dynamic hydrothermal in-situ self-assembly for eco-utilization of zirconium silicate slag 硅酸锆渣生态利用动态水热原位自组装法合成硅钙石保温晶须

IF 4.6 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology

Pub Date : 2026-01-11 DOI: 10.1016/j.powtec.2026.122135

Fang Qi , Ganyu Zhu , Yu Jin , Shaopeng Li , Huiquan Li

Zirconium silicon slag (ZSS), a byproduct from preparing intermediate of zirconium-based chemicals, causes severe environmental pollution owing to large output and extensive land occupation. Herein, a novel one-step dynamic hydrothermal strategy is proposed to realize high-value conversion of ZSS into xonotlite nanocrystal thermal-insulation materials. Its active surface and intrinsic components in-situ drive efficient xonotlite crystallization and growth. Reasonable elevation in liquid-solid ratio and temperature enhance silicate chain polymerization by forming more Q³ tetrahedra, promoting axial growth for well-dispersed and high-crystallinity of xonotlite. ZSS silicon resources are almost completely converted into xonotlite with thermal conductivity as low as 0.041 W/m‧K. The evolution mechanism involves C-S-H gel formation, its transformation to tobermorite, and self-assembly into well-dispersed xonotlite nano-whiskers. This study provides the underlying insights into xonotlite nanocrystal formation in utilizing silicon-rich resources and broadens its synthesis applications.

锆硅渣是锆基化工中间体制备过程中的副产物，产量大、占地广，对环境污染严重。为此，提出了一种新的一步动态水热策略，实现了高价值转化ZSS为硅钙石纳米晶绝热材料。其活性表面和固有成分原位驱动硬石高效结晶和生长。合理提高液固比和温度可促进硅酸盐链聚合，形成更多的Q3四面体，促进硅钙石轴向生长，形成分散性好、结晶度高的硅钙石。ZSS硅资源几乎完全转化为硅钙石，导热系数低至0.041 W/m·K。其演化机制包括C-S-H凝胶的形成、向托贝莫来石的转化以及自组装成分散良好的硅钙石纳米晶须。本研究为利用富硅资源形成硅钙石纳米晶提供了潜在的见解，并拓宽了其合成应用。

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引用次数: 0

Level-Set Particle And Geometry GEnerator (LS-PAGGE): Accurate representations of arbitrary particle shapes 水平集粒子和几何生成器（ls - page）：精确表示任意粒子形状

IF 4.6 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology

Pub Date : 2026-01-10 DOI: 10.1016/j.powtec.2026.122134

Dingeman L.H. van der Haven , Philipp Kloza , Ioannis S. Fragkopoulos , James A. Elliott

Discrete level sets (LS), also known as signed distance functions (SDF), are able to provide highly detailed descriptions of arbitrary geometries, including concave and interlocking shapes, at a relatively low computational cost compared to other shape representations. Level sets have therefore become a popular method to describe geometries in both computational fluid dynamics (CFD) and discrete element method (DEM) simulations. However, the construction of an appropriate level set can be difficult, especially if the geometries are supplied in different formats (e.g. mesh, voxel image, etc.) or need to be modified. This creates a high entry barrier and limits the more widespread usage of level-set methods. Here, a new reinitialisation algorithm is proposed to determine the distance values close to the interface of the object, allowing the generation of an appropriate level set for any geometry. Furthermore, we present a method for determining and adjusting the maximum curvature of the object and a method for adaptively generating meshes and surface nodes to improve the accuracy of contact interactions. All of these developments are included in LS-PAGGE; a new open-code MATLAB package for creating level-set representations from images, meshes, clumps, and user-defined functions. LS-PAGGE can modify level sets using a multitude of operations that allow, e.g., the rotation, merging, splitting, and simplification of particles or objects. The final level-set geometry can be directly exported for DEM/CFD simulations or as a voxel image, mesh, or clump.

离散水平集（LS），也称为符号距离函数（SDF），能够以相对较低的计算成本提供任意几何形状的非常详细的描述，包括凹形和互锁形状。因此，水平集已成为计算流体力学（CFD）和离散元法（DEM）模拟中描述几何形状的流行方法。然而，构建一个适当的水平集可能是困难的，特别是当几何形状以不同的格式提供（例如网格，体素图像等）或需要修改时。这就造成了很高的进入门槛，限制了水平集方法的更广泛使用。在这里，提出了一种新的重新初始化算法来确定接近物体接口的距离值，允许为任何几何形状生成适当的水平集。此外，我们还提出了一种确定和调整物体最大曲率的方法，以及一种自适应生成网格和表面节点的方法，以提高接触相互作用的精度。所有这些发展都包含在ls - page中；一个新的开放代码MATLAB包，用于从图像、网格、团块和用户定义函数中创建水平集表示。ls - page可以使用多种操作修改关卡集，例如，旋转、合并、分裂和简化粒子或对象。最终的水平集几何图形可以直接导出用于DEM/CFD模拟，也可以作为体素图像、网格或簇。

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引用次数: 0

Collision detachment behavior of moist fine-grained coal under vibration 振动作用下湿细粒煤的碰撞分离行为

IF 4.6 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology

Pub Date : 2026-01-09 DOI: 10.1016/j.powtec.2026.122127

Ruile Li , Sanpeng Gong , Xinwen Wang , Dongdong Lin , Ningning Xu , Xiaokun Zhang , Runhui Geng , Yixin Wang

Dry deep screening of moist coal is a key technology that urgently requires development in coal production. The effects of parameters such as material moisture content, screen surface material, gangue mineral type, and layer thickness on the detachment behavior of moist fine particles from coarse particle surfaces were investigated using a custom-designed vibrational impact detachment apparatus. The results demonstrate that particle detachment is induced by vibrational collision. The buffering effect of the material layer reduces the impact forces on coal blocks, thereby decreasing the detachment ratio. Additionally, the frictional effect of the material layer on coal blocks is found to be another cause of fine particle detachment. At low vibration intensities, re-adherence to coal block surfaces is observed in the bottom particle bed; however, the mass of re-adhered fine particles is significantly lower than that of particles detached via vibrational collisions. The high deformability of polyurethane is found to reduce impact forces during collisions, resulting in lower detachment ratios for polyurethane specimens compared to those of coal and Q235 steel. Three types of moist coal-gangue mixtures are prepared by mixing coal with equal masses of kaolin, quartz, and calcite, respectively; kaolin is found to exhibit the highest resistance to detachment. For a constant vibration intensity, the detachment ratio is observed to initially increase with amplitude before reaching a plateau.

湿煤干式深筛是煤炭生产中急需发展的一项关键技术。采用自行设计的振动冲击剥离装置，研究了物料含水率、筛面材料、脉石矿物类型、层厚等参数对湿细颗粒从粗颗粒表面剥离行为的影响。结果表明，振动碰撞诱发粒子分离。材料层的缓冲作用减小了对煤块的冲击力，从而降低了剥离比。此外，发现材料层对煤块的摩擦作用是细颗粒脱离的另一个原因。在低振动强度下，在底部颗粒床中观察到煤块表面的重新粘附；然而，重新粘附的细颗粒的质量明显低于通过振动碰撞分离的颗粒的质量。研究发现，聚氨酯的高变形能力在碰撞过程中降低了冲击力，与煤和Q235钢相比，聚氨酯试样的脱离率更低。通过将煤与等量的高岭土、石英和方解石混合，制备了三种湿煤矸石混合物；人们发现高岭土具有最高的抗脱落性。对于恒定的振动强度，观察到剥离比在达到平台之前最初随振幅增加。

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引用次数: 0

Computational fluid dynamics for analyzing airflow and heat distribution in the aeration of grains stored in full-scale silos 计算流体力学用于分析全尺寸筒仓中储存谷物通气过程中的气流和热量分布

IF 4.6 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology

Pub Date : 2026-01-09 DOI: 10.1016/j.powtec.2026.122121

Dalmo Paim de Oliveira, Paulo Carteri Coradi

Aeration systems maintain grain quality by regulating airflow through the grain mass, yet non-uniform grain distribution (affected by fines, dockage, and moisture content) complicates airflow prediction. Since effective grain storage requires precise control of environmental parameters such as temperature, moisture, and pressure to prevent spoilage from insects, fungi, and germination, understanding and addressing these airflow challenges is essential. Computational Fluid Dynamics (CFD) simulations offer a valuable tool for analyzing airflow behavior in silos, complementing experimental approaches. This study employs CFD (Ansys CFX®) to evaluate airflow distribution in silos storing five grain types (corn, soybean, wheat, rice, and oats) under different geometric configurations (peaked, leveled, and cored). The simulations incorporate the Darcy-Forchheimer model to account for porous media resistance, using experimentally derived coefficients from Ergun's equation. Additionally, grain quality parameters (germination, moisture, porosity, proximate composition) were assessed at three storage period to correlate aeration efficiency with preservation outcomes (initial, 1 month of storage, and 2 months of storage). This study demonstrates that the integration of CFD simulations with experimental grain quality analyses provides a comprehensive approach to understanding aeration efficiency in vertical silos. The findings highlight that both silo geometry and grain properties strongly determined airflow behavior, influencing thermal distribution and preservation outcomes. By evidencing the benefits of optimized designs and uniform aeration, the results reinforced the importance of tailoring storage strategies to grain-specific characteristics, contributing to safer and more sustainable post-harvest management.

曝气系统通过调节气流通过粮食质量来维持粮食质量，但不均匀的粮食分布（受细粒、滞留和水分含量的影响）使气流预测复杂化。由于有效的粮食储存需要精确控制环境参数，如温度，湿度和压力，以防止昆虫，真菌和发芽的腐败，了解和解决这些气流挑战是必不可少的。计算流体动力学（CFD）模拟为分析筒仓内的气流行为提供了有价值的工具，补充了实验方法。本研究采用CFD （Ansys CFX®）对五种谷物（玉米、大豆、小麦、水稻和燕麦）仓在不同几何构型（尖顶、水平和有芯）下的气流分布进行了分析。模拟结合了Darcy-Forchheimer模型来解释多孔介质的阻力，使用从Ergun方程中得到的实验系数。此外，在三个贮藏期（初始、1个月和2个月）评估了谷物质量参数（发芽、水分、孔隙度、近似成分），以将通风效率与贮藏结果相关联。该研究表明，将CFD模拟与试验谷物品质分析相结合，为理解垂直筒仓的通气效率提供了一种全面的方法。研究结果强调，筒仓的几何形状和颗粒特性都强烈地决定了气流行为，影响了热分布和保存结果。通过证明优化设计和均匀通风的好处，研究结果强调了根据粮食特定特性定制储存策略的重要性，有助于更安全、更可持续的收获后管理。

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引用次数: 0

Impact of chitosan modification on the hyperthermic behaviour of magnetite nanoparticles 壳聚糖改性对纳米磁铁矿热行为的影响

IF 4.6 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology

Pub Date : 2026-01-09 DOI: 10.1016/j.powtec.2026.122122

Aiswarya Gowri V.S. , Karolinekersin Enoch , Sudhanshu Shekhar Pati , Anbumozhi Angayarkanni Somasundaram

Agglomeration and poor biocompatibility have been identified as the critical barriers for magnetite nanoparticles in magnetic hyperthermia applications. This study investigates the role of a minimal chitosan biopolymer (0.5–2 wt%) modification in tailoring the structural integrity, dispersion stability, magnetic response, and heating efficiency of magnetite nanoparticles for magnetic hyperthermia applications. Structural characterisation using X-ray diffraction verified a single-phase inverse spinel crystal structure for all synthesised nanoparticles, with average crystallite sizes ranging from 8.59 to 11.3 nm. Chitosan modification profoundly enhanced colloidal stability by shifting the zeta potential from −11.9 mV to highly positive values (> + 42 mV) and reducing the hydrodynamic diameter and polydispersity to a minimum of 295.9 nm and 0.383 at 1.5 wt% chitosan modification, indicating superior dispersion and reduced polydispersity of magnetite nanoparticles. Magnetically, the coating preserved superparamagnetic behaviour while inducing a non-monotonic variation in effective magnetic anisotropy from 11.9 to 19.48 kJ/m³. In hyperthermia experiments (8 kA/m, 500 kHz), the 1.5 wt% chitosan-coated nanoparticles achieved the highest specific absorption rate of 32.65 W/g, which was driven by the synergistic combination of optimised effective anisotropy and superior colloidal dispersion. These findings suggest that the 1.5 wt% chitosan-modified magnetite nanoparticles are a promising candidate for magnetic hyperthermia therapy.

团聚和生物相容性差已被确定为磁铁矿纳米颗粒在磁热疗应用中的关键障碍。本研究探讨了一种最小的壳聚糖生物聚合物（0.5-2 wt%）改性在磁铁矿纳米颗粒的结构完整性、分散稳定性、磁响应和加热效率方面的作用，用于磁热疗应用。利用x射线衍射对合成的纳米颗粒进行了结构表征，证实其均为单相反尖晶石晶体结构，平均晶粒尺寸在8.59 ~ 11.3 nm之间。壳聚糖改性可将zeta电位从- 11.9 mV转变为高正值（+ 42 mV），并将水动力直径和多分散性降低到最小的295.9 nm和0.383，从而显著提高了胶体的稳定性，表明壳聚糖改性具有优异的分散性和降低的多分散性。在磁性方面，涂层保持了超顺磁性行为，同时诱导了有效磁各向异性从11.9到19.48 kJ/m3的非单调变化。在热疗实验（8 kA/m, 500 kHz）中，1.5 wt%壳聚糖包被的纳米颗粒达到了最高的比吸收率32.65 W/g，这是由优化的有效各向异性和优越的胶体分散的协同组合驱动的。这些发现表明，1.5%壳聚糖修饰的磁铁矿纳米颗粒是一种很有前途的磁热疗候选者。

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引用次数: 0

Industrial-scale DEM modelling of segregation in the blast furnace charging system 高炉加料系统中偏析的工业规模DEM建模

IF 4.6 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology

Pub Date : 2026-01-08 DOI: 10.1016/j.powtec.2026.122116

Ahmed Hadi , Yusong Pang , Allert Adema , Jan van der Stel , Dingena Schott

Segregation of the ferrous burden during blast furnace (BF) charging can cause uneven layer formation at the furnace throat, reducing bed permeability and disrupting gas–solid interaction. This study applies a discrete element method (DEM) model to the industrial-scale BF charging system (from the skip car to top hopper discharge) to examine segregation under real operating conditions. The model includes the full ferrous mixture (pellets, sinter, lump ore, and nut coke) and the real-scale geometries. A reference case representing current practice is analysed in detail and compared with systematically varied case studies. The results show that segregation generally decreases from the skip car to the top hopper due to partial remixing, but strong segregation is still observed. Lump ore and nut coke exhibit the strongest segregation, while pellets remain the least segregated. The order of pellets and sinter in the weighing bunkers strongly influences their segregation patterns, whereas variations in the sinter particle size distribution (PSD) and particle shape have only limited effects. The insights from this study provide a basis for developing practical strategies to mitigate segregation in industrial BF charging.

高炉装料过程中铁料的偏析会导致炉喉处形成不均匀层，降低床层渗透率，破坏气固相互作用。本研究将离散元法（DEM）模型应用于工业规模高炉装料系统（从料车到顶部料斗出料），以检验实际操作条件下的离析情况。该模型包括全铁混合物（球团、烧结矿、块状矿和坚果焦）和实际几何形状。详细分析了代表当前实践的参考案例，并与系统变化的案例研究进行了比较。结果表明：由于部分再混合，从料车到料斗顶部偏析现象普遍减少，但偏析现象仍然很严重；块状矿石和果仁焦的偏析作用最强，而球团矿的偏析作用最小。称量仓内球团和烧结矿的顺序对其偏析模式有强烈的影响，而烧结矿粒度分布（PSD）和颗粒形状的变化对其影响有限。本研究的见解为制定缓解工业高炉装料中离析的实用策略提供了基础。

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引用次数: 0