Powder Technology最新文献_第4页

Particle redistribution and homogeneity in sand mixing under axial reciprocation using computed tomography 轴向往复作用下砂土混合中的颗粒重分布和均匀性

IF 4.6 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology

Pub Date : 2026-04-15 Epub Date: 2026-01-29 DOI: 10.1016/j.powtec.2026.122223

Ying Liu , Lin Feng Yu , Xu Liang , Yu Qi Jin , Yong Feng Deng , Min Liang Fei , Jie Hu , Han Ke

Particle mixing processes and homogeneity are of great significance in multiple industries, where they govern product quality and processing efficiency. To investigate the flow behavior and mixing performance of particle systems in vertical bladed mixers, Computed Tomography (CT) scanning tests were performed on samples mixed with different paddle types under a combined rotation and axial reciprocation mode, a mode widely applied in industrial mixing processes to enhance axial homogeneity. Tracer particles in the tests were reconstructed in three dimensions utilizing an image computing platform to visualize their distribution. Mixing indices, i.e., particle area ratios, inhomogeneous distribution coefficients, and fluctuation coefficients, were calculated based on an equal-area polar grid method to evaluate mixing homogeneity. The results show that, in the vertical direction, tracer particles initially located in the central region exhibited a net downward migration resulting from incomplete flow reversal, i.e., the upward paddle stroke did not fully return particles displaced downward during the preceding stroke. In the horizontal direction, the overall homogeneity of scanned cross-sections followed a three-stage trapezoidal distribution. Among the tested paddle types, 35° four-bladed paddles achieved a more homogeneous horizontal distribution. Axial reciprocation promoted vertical redistribution and particle recirculation, thereby improving horizontal homogeneity. These findings demonstrate the potential of CT-based analysis for revealing particle-scale mixing mechanisms and support the optimization of particle mixing operations.

颗粒混合过程和均匀性在许多行业中都具有重要意义，它们决定着产品质量和加工效率。为了研究垂直叶片混合器中颗粒系统的流动行为和混合性能，在旋转和轴向往复组合模式下对不同桨型混合的样品进行了计算机断层扫描（CT）测试。旋转和轴向往复组合模式广泛应用于工业混合过程中，以增强轴向均匀性。利用图像计算平台对试验中的示踪粒子进行三维重建，使其分布可视化。采用等面积极坐标网格法计算混合指标，即颗粒面积比、不均匀分布系数和波动系数，评价混合均匀性。结果表明，在垂直方向上，由于流动不完全逆转，最初位于中心区域的示踪颗粒表现出净向下迁移，即向上的桨叶行程并没有完全返回在前一行程中向下位移的颗粒。在水平方向上，扫描截面的整体均匀性遵循三级梯形分布。在试验桨叶类型中，35°四叶桨叶的水平分布更为均匀。轴向往复运动促进了垂直再分布和颗粒再循环，从而改善了水平均匀性。这些发现证明了基于ct的分析在揭示颗粒尺度混合机制和支持颗粒混合操作优化方面的潜力。

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引用次数: 0

Intensification of a continuous powder mixing process by distributed and/or delayed feeding 通过分散和/或延迟进料来加强连续的粉末混合过程

IF 4.6 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology

Pub Date : 2026-04-15 Epub Date: 2026-02-06 DOI: 10.1016/j.powtec.2026.122229

Marie-Anne Batel, Lorenzo Contardo, Cendrine Gatumel, Henri Berthiaux

Intensification of the continuous powder mixing process is intended to limit the effects of segregation, such as poor mixture homogeneity and long transient phases. Process intensification has mainly been developed for fluid processes, for example with staged or distributed feeding. In this work, we study the impact of distributed feeding of a segregating component along the entire length of a lab-scale continuous powder mixer. For this, a specific device is developed and tested for different feed configurations. We show that starting one of the feeders a few tenths of seconds after the beginning of the experiment reduces the mass of mixture produced during the transient regime at start-up. When using the optimal time delay, this mass is always lower than that obtained with conventional feeding. The feed configuration and the time delay of a feeder also have an impact on the homogeneity of the mixture at steady-state, due to the mixing and segregation mechanisms at play during process start-up.

强化连续粉末混合过程是为了限制偏析的影响，如混合物均匀性差和瞬态相长。过程强化主要是针对流体过程而开发的，例如采用分段或分布进料。在这项工作中，我们研究了沿实验室规模连续粉末混合器的整个长度分布进料的分离组件的影响。为此，开发了一种特定的设备，并针对不同的进料配置进行了测试。我们表明，在实验开始后的十分之一秒内启动其中一个进料器，可以减少启动时瞬态状态下产生的混合物的质量。当使用最优时滞时，该质量总是低于常规进料所获得的质量。由于在工艺启动过程中起作用的混合和离析机制，给料装置和给料器的时间延迟也会影响稳态下混合物的均匀性。

引用次数: 0

Detailed quantification of internal erosion in railway subgrades under cyclic loading 循环荷载作用下铁路路基内部侵蚀的详细量化

IF 4.6 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology

Pub Date : 2026-04-15 Epub Date: 2026-02-03 DOI: 10.1016/j.powtec.2026.122231

Feng Gao , Sheng Zhang , Xuzhen He , Feng Shi , Shaoheng Dai

Extreme weather events and intense rainfall increasingly make railway subgrade structures susceptible to internal erosion. While extensive research addresses internal erosion under steady-state conditions, the combined impact of cyclic loading and upward seepage flow, critically relevant to railway subgrades, remains largely underexplored. This study experimentally investigates internal erosion in Group A/B coarse fills under these complex hydromechanical conditions. Dye tracing and particle image identification techniques were employed to track the depth of origin and composition of eroded particles. Three erosion modes – stable, transitional, and failure - were identified and described using a power-law relationship. Higher hydraulic pressures accelerated particle loss throughout all soil layers. For instance, at 5 Hz, total eroded mass sharply increased from 15 g (at 5 kPa) to over 318 g (at 11 kPa). Increased loading frequency intensified hydraulic gradient fluctuations and shifted the primary erosion zone downward, resulting in more severe erosion. Dye tracing revealed that under stable conditions, over 80% of eroded fine particles (<0.25 mm) originated from upper layers. Conversely, in transitional and failure modes, particle loss extended to deeper layers, including coarser particles (up to 2 mm). For example, under 11 kPa pressure and 15 Hz loading, approximately 37.6% of the total loss originated from the two bottom layers. Hydraulic measurements further confirmed that both increasing hydraulic pressure (peak gradient rising from 1.45 to 8.45) and loading frequency (interquartile range of gradient expanding by 2.6 times) intensified soil instability. These detailed quantitative can provide data to support filter layer design and the development of constitutive models for predicting internal erosion in railway subgrades.

极端天气事件和强降雨使铁路路基结构越来越容易受到内部侵蚀。虽然广泛的研究解决了稳态条件下的内部侵蚀问题，但与铁路路基至关重要的循环荷载和向上渗流的综合影响在很大程度上仍未得到充分探讨。实验研究了A/B组粗填土在复杂流体力学条件下的内部侵蚀。采用染料示踪和颗粒图像识别技术跟踪侵蚀颗粒的起源深度和组成。三种侵蚀模式-稳定，过渡和破坏-被确定和描述使用幂律关系。更高的水力压力加速了所有土层的颗粒损失。例如，在5hz时，总侵蚀质量从15g （5kpa）急剧增加到318g （11kpa）以上。加载频率的增加加剧了水力梯度波动，使原始侵蚀带下移，导致侵蚀更加严重。染料示踪显示，在稳定条件下，超过80%的侵蚀细颗粒（<0.25 mm）来自上层。相反，在过渡和失效模式下，颗粒损失扩展到更深的层，包括更粗的颗粒（高达2毫米）。例如，在11kpa压力和15hz加载条件下，约37.6%的总损失来自底层。水力测量进一步证实，增大水力压力（峰值梯度从1.45增加到8.45）和加载频率（梯度四分位数范围扩大2.6倍）都加剧了土体的失稳。这些详细的定量数据可以为过滤层的设计和本构模型的发展提供数据，以预测铁路路基的内侵蚀。

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引用次数: 0

Preparation and mineralogical characteristics of basic oxidized fired pellets from high‑phosphorus oolitic magnetite concentrate 高磷鲕状磁铁矿精矿碱性氧化焙烧球团的制备及其矿物学特性

IF 4.6 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology

Pub Date : 2026-04-15 Epub Date: 2026-01-29 DOI: 10.1016/j.powtec.2026.122215

Deqing Zhu , Mengjie Hu , Jian Pan , Siwei Li , Lu Chen

Basic oxidized pellets were prepared from high‑phosphorus oolitic iron ore for dephosphorization and direct reduction application. This study systematically investigated the effects of basicity (CaO/SiO₂) on their mineralogy, consolidation, and phosphorus migration. Pelletizing with calcium hydroxide binder produced qualified green pellets without bentonite. Optimized roasting yielded compressive strengths above 2700 N for pellets with basicity (R) between 0.035 and 2.0, while strength decreased to 2071 N at R = 2.5. The required heat treatment depended on basicity: a soaking stage was essential only for R ≥ 1.5. Mineralogical analysis indicated consolidation at low R (0.035–1.0) was governed by hematite and silicate recrystallization, whereas at high R (1.0–2.5) it relied on SFCA and gehlenite recrystallization. Increasing basicity from 0.035 to 2.5 raised porosity from 17.79% to 57.92% and expanded average pore diameter from 5.81 μm to 10.32 μm, coarsening the pore structure. Thermodynamics suggested higher basicity promoted excessive liquid phase, causing pore coarsening and strength loss. Phosphorus migration analysis showed that during roasting, phosphorus migrated from iron oxides into anorthite and SFCA as basicity increased to 1.0. At higher basicity (1.0–2.5), phosphorus was almost entirely incorporated into gehlenite, with negligible retention in iron-bearing phases. These results confirm that increasing basicity effectively promotes selective phosphorus transfer to slag phases, enriching phosphorus in the slag and facilitating subsequent dephosphorization.

以高磷鲕状铁矿为原料制备碱性氧化球团，用于脱磷和直接还原应用。本研究系统地研究了碱度（CaO/ sio2）对其矿物学、固结和磷迁移的影响。用氢氧化钙粘结剂造粒，生产出不含膨润土的合格绿色球团。当碱度(R)为0.035 ~ 2.0时，焙烧后球团的抗压强度在2700 N以上，而当碱度(R)为2.5时，球团的抗压强度降至2071 N。所需的热处理取决于碱度：只有当R≥1.5时才需要进行浸泡阶段。矿物学分析表明，低R（0.035 ~ 1.0）固结主要受赤铁矿和硅酸盐再结晶作用的支配，高R（1.0 ~ 2.5）固结主要受SFCA和辉长石再结晶作用的支配。碱度从0.035增加到2.5，孔隙度从17.79%增加到57.92%，平均孔径从5.81 μm扩大到10.32 μm，孔隙结构变粗。热力学表明，碱度越高，液相过多，孔隙变粗，强度损失越大。磷迁移分析表明，在焙烧过程中，随着碱度增加到1.0，磷从氧化铁中迁移到钙长石和SFCA中。在较高的碱度（1.0-2.5）下，磷几乎完全融入辉长岩中，在含铁相中保留可以忽略不计。这些结果证实，增加碱度有效地促进了磷向渣相的选择性转移，使渣中的磷富集，有利于后续的脱磷。

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引用次数: 0

A novel spatial streamlined inlet for hydrocyclone: Parametric design and separation enhancement mechanism 一种新型空间流线型水力旋流器入口：参数化设计与分离强化机制

IF 4.6 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology

Pub Date : 2026-04-15 Epub Date: 2026-01-29 DOI: 10.1016/j.powtec.2026.122191

Yuru Mei , Jian-gang Wang , Hualin Wang , Yinghao Yang , Yafei Zhang

To achieve efficient classification of particles with low density differences, a parametric design method is proposed for a hydrocyclone inlet with a spatial streamlined profile. The inlet geometry is defined using data points and spline curves, allowing flexible adjustment of local curvature to enhance control over particle motion. Numerical simulations were performed to analyze the effects of different inlet structures on the internal flow field characteristics of the hydrocyclone, and a pre-sorting coefficient (k) was introduced to quantitatively characterize the relationship between inlet geometry and particle transport behavior. Experimental comparisons identified three inlet configurations with superior separation performance. The results indicate that, at a split ratio of 25%, the H45360 hydrocyclone achieves a maximum separation efficiency of 72.93%, representing an improvement of 13.75% compared with a conventional tangential inlet. Response surface methodology was further employed to analyze the interactions among operating parameters and optimize the inlet configuration. The optimal inlet inclination angle and wrap angle were determined to be 50° and 360°, respectively, achieving an effective balance between separation efficiency and energy consumption. The CFD simulation results show excellent agreement with the experimental data (R² = 0.97), demonstrating that the optimized inlet structure significantly improves flow field uniformity and reduces turbulence intensity. Consequently, the classification accuracy of particles with low density contrast is effectively enhanced, leading to improved overall separation performance.

为实现低密度差颗粒的高效分级，提出了一种空间流线型水力旋流器入口的参数化设计方法。入口几何形状使用数据点和样条曲线定义，允许灵活调整局部曲率，以增强对颗粒运动的控制。通过数值模拟分析了不同进口结构对旋流器内部流场特性的影响，并引入预分选系数k定量表征了进口几何形状与颗粒输运行为之间的关系。实验对比表明，三种进气道结构具有较好的分离性能。结果表明，在劈裂比为25%时，H45360水力旋流器的最大分离效率为72.93%，比传统切向进口提高了13.75%。利用响应面法分析了各工况参数之间的相互作用，优化了进气道结构。确定了最佳进气倾角为50°，最佳包裹角为360°，实现了分离效率与能耗的有效平衡。CFD模拟结果与实验数据吻合良好（R2 = 0.97），表明优化后的进气道结构显著改善了流场均匀性，降低了湍流强度。从而有效提高了低密度对比颗粒的分类精度，提高了整体分离性能。

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引用次数: 0

An angle-based induced potential difference model for contact electrification of insulating particles 基于角度的绝缘颗粒接触带电感应电位差模型

IF 4.6 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology

Pub Date : 2026-04-15 Epub Date: 2026-01-18 DOI: 10.1016/j.powtec.2026.122124

Zhen Tan, Wei Yan

When insulating particles contact metallic surfaces, the electric field from the particle's own charge creates an image effect. This leads to an induced potential difference at the contact interface. Conventional point charge models shows significant errors when particle size cannot be ignored. This paper proposes an Angle-Based Induced Potential Difference (ABIPD) model. By establishing a local particle coordinate system, the model quantifies the influence of the original charge distribution and the spatial angle between the charged surface and contact surface on the potential gradient. Numerical integration and central difference methods are employed to systematically solve the potential distribution at the contact surface. Integrating with the Boltzmann function, a quantitative relationship between the induced potential difference and the contact angle is established. After embedding the ABIPD model within a condenser model, the effects of initial charge quantity, impact velocity, and the angle between the charged surface and the contact surface on charge transfer were simulated. Model validation was achieved through comparison with experimental data from Matsusaka et al. This model provides a theoretical tool for predicting contact electrification in insulating particles.

当绝缘粒子接触金属表面时，粒子自身电荷产生的电场会产生图像效应。这导致在接触界面处产生感应电位差。传统的点电荷模型在不能忽略粒子大小的情况下存在明显的误差。提出了一种基于角度的感应电位差（ABIPD）模型。该模型通过建立局部粒子坐标系，量化了原始电荷分布和带电面与接触面空间夹角对电位梯度的影响。采用数值积分法和中心差分法系统求解接触面电势分布。结合玻尔兹曼函数，建立了感应电位差与接触角之间的定量关系。将ABIPD模型嵌入到冷凝器模型中，模拟了初始电荷量、冲击速度、电荷面与接触面夹角对电荷传递的影响。通过与Matsusaka等人的实验数据进行对比，验证了模型的有效性。该模型为预测绝缘颗粒的接触带电提供了理论工具。

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引用次数: 0

Real-time capable deep learning framework for stable long-term forecasting of solids holdup in fluidized beds 实时深度学习框架，用于稳定的流化床固体含率长期预测

IF 4.6 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology

Pub Date : 2026-04-15 Epub Date: 2026-02-02 DOI: 10.1016/j.powtec.2026.122234

Song Deng , Xieyu He , Xiao Chen , Qiang Zhou

Digital twin technology for gas-solid fluidized beds is urgently needed for the upgrading of chemical industries, prompting the development of various deep learning-based approaches aimed at achieving accurate, real-time, and long-term simulations of chemical processes. However, existing models often face challenges of error accumulation in delivering accurate long-term and real-time recursive predictions. To address the issue, we propose a lightweight deep learning framework based on the U-Net architecture integrated with a Dynamic Distortion Monitoring and Replacement (DDMR) module. The lightweight U-Net serves as the core spatiotemporal forecasting backbone, capturing the characteristics of gas-solid flows to generate initial physical fields. The DDMR module monitors distorted outputs and replaces them with samples from the historical training set's data selected based on pressure drop similarity, effectively mitigating error accumulation. The proposed framework maintains stable, distortion-free predictions over 2000 consecutive time steps, achieves real-time inference (inference time is 62–93% of physical time), and exhibits robust generalization (the relative error of bed expansion ratio < 4%; structural similarity for time-averaged solids holdup fields >0.9). These findings demonstrate the potential of the proposed framework in facilitating long-term real-time monitoring and control of industrial fluidized bed systems.

化工产业升级迫切需要气固流化床数字孪生技术，促使各种基于深度学习的方法发展，旨在实现精确、实时和长期的化工过程模拟。然而，现有模型在提供准确的长期和实时递归预测时经常面临误差积累的挑战。为了解决这个问题，我们提出了一个基于U-Net架构的轻量级深度学习框架，该框架集成了动态失真监测和替换（DDMR）模块。轻型U-Net作为核心时空预测骨干，捕捉气固流动特征，生成初始物理场。DDMR模块监测失真输出，并将其替换为基于压降相似度选择的历史训练集数据样本，有效地减轻了误差积累。所提出的框架在2000个连续时间步长内保持稳定、无扭曲的预测，实现实时推断（推断时间为物理时间的62-93%），并表现出鲁棒的一般化（床层膨胀比的相对误差<； 4%；时间平均固体含率场的结构相似性>；0.9）。这些发现证明了所提出的框架在促进工业流化床系统的长期实时监测和控制方面的潜力。

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引用次数: 0

Effects of preparation parameters on porosity and cold compressive strength of electric arc furnace dust briquettes 制备参数对电弧炉粉尘型煤孔隙率和冷压强度的影响

IF 4.6 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology

Pub Date : 2026-04-15 Epub Date: 2026-02-06 DOI: 10.1016/j.powtec.2026.122212

Ang Li , Chunchen Xu , Chuluke Aisiaiti , Chunyang Lu , Dengwei Zhang , Mikko Helle , Yuandong Xiong , Yang Ni , Wengang Song , Bo Wang , Jie Ren , Yaowei Yu

This study systematically investigated the optimization of the cold press forming process to enhance the mechanical performance, specifically the compressive strength, of electric furnace ash briquettes. The research addressed challenges associated with the direct charging of fine powder materials into metallurgical furnaces, namely poor permeability and low recovery rates. A univariate experimental design was employed to examine the effects of three critical parameters—pressing pressure, moisture content, and drying temperature—on the porosity and compressive strength of the briquettes. Two-dimensional porosity was quantitatively characterized using binarized image analysis, and a statistical model was developed to describe the quantitative relationship between porosity and compressive strength. The experimental results demonstrate that:

(1) Pressing pressure, moisture content, and drying temperature exhibit significant correlations with the briquette properties, with coefficients of determination (R²) of 0.9329, 0.8393, and 0.9495, respectively. (2) Appropriate control of moisture content and drying temperature effectively enhances the metallurgical performance of the briquettes, while porosity shows a strong negative correlation with compressive strength. (3) The optimal process parameters—pressing pressure of 225 MPa, moisture content of 7 wt%, and drying temperature of 150 °C—produce the maximum compressive strength. This study elucidates the intrinsic relationship between pore structure evolution and the mechanical behavior of cold-pressed briquettes, providing fundamental insights into the porosity–strength relationship and guidance for the preliminary mechanical optimization of cold-bonded briquettes intended for metallurgical recycling routes.

本研究系统地研究了优化冷压成型工艺以提高电炉灰型煤的力学性能，特别是抗压强度。该研究解决了与冶金炉直接装药细粉材料相关的挑战，即渗透性差和回收率低。采用单变量试验设计来检验三个关键参数——加压压力、含水率和干燥温度——对型煤的孔隙率和抗压强度的影响。利用二值化图像分析方法对二维孔隙度进行定量表征，建立了孔隙度与抗压强度定量关系的统计模型。实验结果表明：(1)加压压力、含水率和干燥温度对型煤性能有显著相关性，决定系数（R2）分别为0.9329、0.8393和0.9495。(2)适当控制含水率和干燥温度可有效提高型煤的冶金性能，孔隙率与抗压强度呈较强的负相关关系。(3)加压压力225 MPa、含水率7 wt%、干燥温度150℃的最佳工艺参数可产生最大抗压强度。本研究阐明了冷压型煤孔隙结构演化与力学行为之间的内在关系，为研究冷压型煤的孔隙-强度关系提供了基础见解，并为冶金回收路线冷压型煤的初步力学优化提供了指导。

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引用次数: 0

Dual roles of sludge ash in ilmenite reactivity during fluidized bed chemical looping combustion 流化床化学循环燃烧过程中污泥灰分在钛铁矿反应性中的双重作用

IF 4.6 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology

Pub Date : 2026-04-15 Epub Date: 2026-02-01 DOI: 10.1016/j.powtec.2026.122205

Rong Yang , Shangkun Quan , Dongfang Li , Xiuting Yang , Shaosheng Fang , Aoyang Zhang , Hairui Yang , Man Zhang , Xing Zhu , Hua Wang

Chemical looping combustion (CLC) provides an efficient route for fuel conversion with inherent CO₂ separation. Utilizing sewage sludge as fuel enables negative CO₂ emissions and waste valorization. However, the ash in sewage sludge may influence the performance of oxygen carriers (OCs). This study explores the effect of sewage sludge ash (SA) addition on ilmenite, focusing on different SA ratios (0–15 wt%) and redox cycles. Ilmenite reactivity increased with SA addition, peaking at 10% SA, while 15% caused slight agglomeration and minor activity loss. X-ray photoelectron spectroscopy and H₂ temperature-programmed reduction confirmed that ilmenite with 10% SA possessed enhanced redox activity and oxygen release. X-ray diffraction and thermodynamic analysis identified the formation of CaFe₂O₄, which was accompanied by an improvement in reactivity. Brunauer–Emmett–Teller and mercury intrusion analyses showed that 10% SA yielded the largest specific surface area (0.5705 m²/g) and pore volume (0.04452 cm³/g), 1.54 and 1.52 times higher than those of raw ilmenite. Although attrition increased with SA content, cumulative mass loss remained below 0.15 g (<1%), indicating excellent thermomechanical stability. Kinetic fitting revealed that the one-dimensional diffusion model provided the lowest mean error (10.6%), suggesting that CO reduction of ilmenite was diffusion-controlled. This work clarifies the dual roles of SA in regulating ilmenite reactivity and offers insights for optimizing long-term CLC operation.

化学环燃烧（CLC）提供了一种有效的燃料转化途径，具有固有的CO₂分离。利用污水污泥作为燃料，可以实现负二氧化碳排放和废物增值。污泥中的灰分会影响氧载体（OCs）的性能。本研究探讨了污水污泥灰（SA）添加对钛铁矿的影响，重点研究了不同的SA比例（0-15 wt%）和氧化还原循环。随着SA的加入，钛铁矿的反应活性增加，在SA添加量为10%时达到峰值，而SA添加量为15%时，钛铁矿的结块和活性损失较小。x射线光电子能谱和H₂程序升温还原证实，添加10% SA的钛铁矿具有增强的氧化还原活性和氧释放。x射线衍射和热力学分析证实了硫酸钙的形成，并伴有反应性的提高。brunauer - emmet - teller和汞侵入分析表明，10% SA比表面积（0.5705 m2/g）和孔隙体积（0.04452 cm3/g）最大，分别是原始钛铁矿的1.54倍和1.52倍。虽然磨耗随着SA含量的增加而增加，但累积质量损失保持在0.15 g （<1%）以下，表明具有良好的热机械稳定性。动力学拟合表明，一维扩散模型的平均误差最小（10.6%），表明钛铁矿的CO还原受扩散控制。这项工作阐明了SA在调节钛铁矿反应性中的双重作用，并为优化CLC的长期操作提供了见解。

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引用次数: 0

Experimental study on molecular structure and multifractal characteristics of coal modified by anaerobic microorganisms 厌氧微生物改性煤的分子结构及多重分形特性实验研究

IF 4.6 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology

Pub Date : 2026-04-15 Epub Date: 2026-01-28 DOI: 10.1016/j.powtec.2026.122214

Shuaili Liu , Chunshan Zheng , Bingyou Jiang , Sheng Xue , Feilin Han , Mingyun Tang , Zhongwei Chen

Microbial degradation could effectively change the microstructure of coal and improve the permeability. The effects of microbial degradation on the surface functional groups, crystal structure, and nanopore structure of coal were investigated by various test methods. Multiscale pore heterogeneity parameters under biogenic influence were calculated based on multifractal theory. Meanwhile, the correlations between different microstructure parameters were analyzed using Spearman correlation analysis. The results show that the CO group and aromatic -CH group content decrease following microbial degradation. The aromaticity I of samples S2 and S3 increases from 1.57 to 2.56 and 1.77, respectively, while the aromaticity I of Y1 and Y2 decreases. The DOC value of the samples becomes smaller, the length of fatty chains increases, and the skeletal structure of coal becomes looser. Microbial activity can lead to a reduction in ink-bottle pores while increasing the proportion of open and semi-closed pores, improving pore connectivity. Microorganisms convert micropores and transitional pores into meso- and macropores by consuming small-molecule organic matter in coal, significantly reducing the content of micropores and increasing the average pore size. After biotransformation, the connectivity H value of coal samples increases, and the heterogeneity ∆α value of meso-macropores decreases. Microorganisms enhance the uniformity and connectivity of meso-macropore spaces by digesting organic matter and enlarging pores, simplifying the pore structure. Relevant results are of guiding importance for elucidating the evolution of coal matrix microstructure during biotransformation and the mechanism of efficient coalbed methane extraction.

微生物降解能有效改变煤的微观结构，提高渗透率。采用多种测试方法研究了微生物降解对煤表面官能团、晶体结构和纳米孔结构的影响。基于多重分形理论计算了生物成因影响下的多尺度孔隙非均质性参数。同时，利用Spearman相关分析分析了不同微观结构参数之间的相关性。结果表明，微生物降解后CO和芳香族-CH含量降低。样品S2和S3的芳香度I分别从1.57增加到2.56和1.77，而样品Y1和Y2的芳香度I降低。样品的DOC值变小，脂肪链长度增加，煤的骨架结构变松散。微生物活动可导致墨水瓶孔隙减少，同时增加开孔和半闭孔的比例，提高孔隙连通性。微生物通过消耗煤中的小分子有机质，将微孔和过渡孔转化为中孔和大孔，显著降低了微孔的含量，增大了平均孔径。生物转化后煤样的连通性H值增大，中宏观孔隙的非均质性∆α值减小。微生物通过消化有机物，扩大孔隙，简化孔隙结构，增强中-大孔空间的均匀性和连通性。相关结果对阐明生物转化过程中煤基质微观结构的演化及煤层气高效抽提机理具有重要的指导意义。

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引用次数: 0