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

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

{"title":"Particle redistribution and homogeneity in sand mixing under axial reciprocation using computed tomography","authors":"Ying Liu , Lin Feng Yu , Xu Liang , Yu Qi Jin , Yong Feng Deng , Min Liang Fei , Jie Hu , Han Ke","doi":"10.1016/j.powtec.2026.122223","DOIUrl":"10.1016/j.powtec.2026.122223","url":null,"abstract":"<div><div>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.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"473 ","pages":"Article 122223"},"PeriodicalIF":4.6,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146185607","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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

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

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

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

{"title":"Detailed quantification of internal erosion in railway subgrades under cyclic loading","authors":"Feng Gao , Sheng Zhang , Xuzhen He , Feng Shi , Shaoheng Dai","doi":"10.1016/j.powtec.2026.122231","DOIUrl":"10.1016/j.powtec.2026.122231","url":null,"abstract":"<div><div>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.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"473 ","pages":"Article 122231"},"PeriodicalIF":4.6,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146185606","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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

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

{"title":"Preparation and mineralogical characteristics of basic oxidized fired pellets from high‑phosphorus oolitic magnetite concentrate","authors":"Deqing Zhu , Mengjie Hu , Jian Pan , Siwei Li , Lu Chen","doi":"10.1016/j.powtec.2026.122215","DOIUrl":"10.1016/j.powtec.2026.122215","url":null,"abstract":"<div><div>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 <em>R</em> = 2.5. The required heat treatment depended on basicity: a soaking stage was essential only for <em>R</em> ≥ 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.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"473 ","pages":"Article 122215"},"PeriodicalIF":4.6,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146185865","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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

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

{"title":"A novel spatial streamlined inlet for hydrocyclone: Parametric design and separation enhancement mechanism","authors":"Yuru Mei , Jian-gang Wang , Hualin Wang , Yinghao Yang , Yafei Zhang","doi":"10.1016/j.powtec.2026.122191","DOIUrl":"10.1016/j.powtec.2026.122191","url":null,"abstract":"<div><div>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 (<em>k</em>) 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 (R<sup>2</sup> = 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.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"473 ","pages":"Article 122191"},"PeriodicalIF":4.6,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146185703","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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

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

Zhen Tan, Wei Yan

{"title":"An angle-based induced potential difference model for contact electrification of insulating particles","authors":"Zhen Tan, Wei Yan","doi":"10.1016/j.powtec.2026.122124","DOIUrl":"10.1016/j.powtec.2026.122124","url":null,"abstract":"<div><div>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.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"473 ","pages":"Article 122124"},"PeriodicalIF":4.6,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146185867","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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

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

{"title":"Real-time capable deep learning framework for stable long-term forecasting of solids holdup in fluidized beds","authors":"Song Deng , Xieyu He , Xiao Chen , Qiang Zhou","doi":"10.1016/j.powtec.2026.122234","DOIUrl":"10.1016/j.powtec.2026.122234","url":null,"abstract":"<div><div>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.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"473 ","pages":"Article 122234"},"PeriodicalIF":4.6,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146185361","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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

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

{"title":"Effects of preparation parameters on porosity and cold compressive strength of electric arc furnace dust briquettes","authors":"Ang Li , Chunchen Xu , Chuluke Aisiaiti , Chunyang Lu , Dengwei Zhang , Mikko Helle , Yuandong Xiong , Yang Ni , Wengang Song , Bo Wang , Jie Ren , Yaowei Yu","doi":"10.1016/j.powtec.2026.122212","DOIUrl":"10.1016/j.powtec.2026.122212","url":null,"abstract":"<div><div>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:</div><div>(1) Pressing pressure, moisture content, and drying temperature exhibit significant correlations with the briquette properties, with coefficients of determination (R<sup>2</sup>) 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.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"473 ","pages":"Article 122212"},"PeriodicalIF":4.6,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146185683","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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

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

{"title":"Dual roles of sludge ash in ilmenite reactivity during fluidized bed chemical looping combustion","authors":"Rong Yang , Shangkun Quan , Dongfang Li , Xiuting Yang , Shaosheng Fang , Aoyang Zhang , Hairui Yang , Man Zhang , Xing Zhu , Hua Wang","doi":"10.1016/j.powtec.2026.122205","DOIUrl":"10.1016/j.powtec.2026.122205","url":null,"abstract":"<div><div>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 m<sup>2</sup>/g) and pore volume (0.04452 cm<sup>3</sup>/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.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"473 ","pages":"Article 122205"},"PeriodicalIF":4.6,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146185690","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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

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

{"title":"Experimental study on molecular structure and multifractal characteristics of coal modified by anaerobic microorganisms","authors":"Shuaili Liu , Chunshan Zheng , Bingyou Jiang , Sheng Xue , Feilin Han , Mingyun Tang , Zhongwei Chen","doi":"10.1016/j.powtec.2026.122214","DOIUrl":"10.1016/j.powtec.2026.122214","url":null,"abstract":"<div><div>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 C<img>O 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 <em>H</em> value of coal samples increases, and the heterogeneity ∆<em>α</em> 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.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"473 ","pages":"Article 122214"},"PeriodicalIF":4.6,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146185701","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0