Powder Technology最新文献

{"title":"Effect of bacterial solution to cementation solution ratio on dust suppression effect of microbial dust suppressant and mechanism analysis","authors":"Yanyun Zhao ,&nbsp;Di Zhang ,&nbsp;Xiangming Hu ,&nbsp;Yue Feng ,&nbsp;Jindi Liu ,&nbsp;Xiaoniu Yu ,&nbsp;Ningjun Jiang","doi":"10.1016/j.powtec.2025.121086","DOIUrl":"10.1016/j.powtec.2025.121086","url":null,"abstract":"<div><div>Dust suppression agent based on Microbially Induced Carbonate Precipitation (MICP) was a new and efficient dust suppression method in recent years, but the environment had a significant impact on its dust suppression effect, and its mechanism of action was complex. This article conducted a dust suppression study by adjusting the volume ratio of bacterial solution and cementation solution in MICP. It was found that the dust suppression efficiency was the highest when the bacterial solution to cementation solution ratio was 2:1, and the wind erosion rate in 15 days was 0.68 %. In the early stage, the nutrients in the bacterial solution bound the coal dust to suppress the dust, but the dominant factor for the continuous performance of the subsequent dust suppression was the deposition and adhesion of CaCO₃ formed by biomineralization. As the reaction progressed, the CaCO₃ crystal form gradually changed from the initial vaterite to calcite. When the proportion of bacterial solution was high, it promoted the convert of crystal form and stabilized the cementation. However, at low bacterial solution proportions, the transformation time of vaterite to calcite was prolonged and the proportion of calcite decreased. The microbial dust suppressant with a high bacterial solution to cementation solution ratio had poor infiltration, causing it to concentrate on the surface of coal dust, resulting in high hardness of the mineralized coal dust consolidation body. At low Bacterial solution to cementation solution ratio, the wettability of the microbial dust suppressant increased, leading to a more uniform consolidation and increased thickness.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"460 ","pages":"Article 121086"},"PeriodicalIF":4.5,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143911701","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}

{"title":"Percolation-based mean field theory for disordered particle packings","authors":"Wenxiang Xu ,&nbsp;Zhuangwei Ma ,&nbsp;Junliang Fu ,&nbsp;Yang Jiao","doi":"10.1016/j.powtec.2025.121088","DOIUrl":"10.1016/j.powtec.2025.121088","url":null,"abstract":"<div><div>Dense disordered packings of hard particles are useful models for granular materials, composites, colloids, foams, and condensed matter. It is very challenging to devise predictive theories of random packings, due to their intrinsic non-equilibrium and non-local nature. Here, we develop a mean-field theory for disordered particle packings by exploiting a recently discovered percolation transition of the hard-particle contact network that precedes the jamming transition. Assuming that the salient structural correlations in the final jammed packing are mainly inherited from those emerging in the percolating particle network, we devise a mean-field formalism that maps the hard particle percolation to analytically solvable Bethe-lattice models. This allows us to establish an analytical relation connecting the packing fraction <em>ϕ</em> and average contact number <em>Z</em> for a wide spectrum of congruent non-spherical hard particles in three-dimensional Euclidean space <strong>ℝ</strong>³, where the particle shape factor is rescaled by the percolation critical exponent, reflecting the coupling of local and large scales in our mean-field formalism. The accuracy of our theory is ascertained by comparing its predictions of <em>ϕ</em> to the corresponding numerical values reported in literature. Our mean-field theory can be readily generalized to higher dimensions.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"460 ","pages":"Article 121088"},"PeriodicalIF":4.5,"publicationDate":"2025-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144089339","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}

{"title":"Decoupling tensile and shear effects in dynamic fracture of glass sphere","authors":"Ying Xiong ,&nbsp;Songlin Xu ,&nbsp;Yushan Xie ,&nbsp;Meiduo Chen ,&nbsp;Liangzhu Yuan ,&nbsp;Pengfei Wang","doi":"10.1016/j.powtec.2025.121083","DOIUrl":"10.1016/j.powtec.2025.121083","url":null,"abstract":"<div><div>Failure in brittle materials shows evident tensile and shear coupling effects due to inner heterogeneous deformation. Based on the dynamic fragmentation experiments of four glass spheres at various strain rates, a statistical approach is established to decouple the tensile effects and the shear effects on dynamic fracture. The fractal dimension is introduced to describe the cracks distribution during sphere fracture, and the evolutions of fractal dimensions due to shear failures and tensile failures are analyzed both on the DIC images and on the numeric cracks distribution by the DEM-FEM. Under higher strain rates, the fractal dimensions of shear cracks distribution are close to those based on total cracks distribution; while under lower strain rates, the fractal dimensions of tensile cracks distribution are close to those based on total cracks distribution. The ultimate fractal dimensions due to shear failures and tensile failures show evident strain rate effects and tensile and shear coupling effects. The relation of statistical shear strength to statistical tensile strength is then established, and based on self-similarity analyses, a novel method for decoupling the effects of tensile failure and shear failure is proposed. The two intrinsic strengths (<span><math><msub><mover><mi>σ</mi><mo>¯</mo></mover><mrow><mi>t</mi><mn>0</mn></mrow></msub></math></span>, <span><math><msub><mover><mi>σ</mi><mo>¯</mo></mover><mrow><mi>s</mi><mn>0</mn></mrow></msub></math></span>) of spheres are obtained. The decoupled strengths are scattered around the line from point (0,0) to point (<span><math><msub><mover><mi>σ</mi><mo>¯</mo></mover><mrow><mi>t</mi><mn>0</mn></mrow></msub></math></span>, <span><math><msub><mover><mi>σ</mi><mo>¯</mo></mover><mrow><mi>s</mi><mn>0</mn></mrow></msub></math></span>), which could be described as <span><math><msub><mover><mi>σ</mi><mo>¯</mo></mover><mi>s</mi></msub><mo>=</mo><msup><msub><mover><mi>σ</mi><mo>¯</mo></mover><mi>t</mi></msub><mrow><msup><mi>D</mi><mo>∗</mo></msup><mo>−</mo><mn>1</mn></mrow></msup><mo>+</mo><msub><mi>k</mi><mi>s</mi></msub><msub><mover><mi>σ</mi><mo>¯</mo></mover><mrow><mi>s</mi><mn>0</mn></mrow></msub></math></span>. The ratio <span><math><msub><mover><mi>σ</mi><mo>¯</mo></mover><mi>t</mi></msub><mo>/</mo><msub><mover><mi>σ</mi><mo>¯</mo></mover><mi>s</mi></msub></math></span> decreases with increasing strain rate, and finally decreases to <span><math><msub><mover><mi>σ</mi><mo>¯</mo></mover><mrow><mi>t</mi><mn>0</mn></mrow></msub><mo>/</mo><msub><mover><mi>σ</mi><mo>¯</mo></mover><mrow><mi>s</mi><mn>0</mn></mrow></msub><mo>=</mo><mn>0.189</mn></math></span>. It is helpful for a profound understanding of the formation and propagation of failures in brittle materials.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"460 ","pages":"Article 121083"},"PeriodicalIF":4.5,"publicationDate":"2025-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143908195","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}

{"title":"Corrigendum to “Anti-hygroscopic effect of leucine on spray-dried herbal extract powders” [Powder Technology, Volume 266, 2014, Pages 388–395].","authors":"Yue-Xing Chang,&nbsp;Jing-Jing Yang,&nbsp;Rui-Le Pan,&nbsp;Qi Chang,&nbsp;Yong-Hong Liao","doi":"10.1016/j.powtec.2025.121068","DOIUrl":"10.1016/j.powtec.2025.121068","url":null,"abstract":"","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"460 ","pages":"Article 121068"},"PeriodicalIF":4.5,"publicationDate":"2025-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144088989","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}

{"title":"Quantifying the platy morphology of gangue minerals with X-ray diffraction: A talc case study","authors":"Daniel Dodoo ,&nbsp;Nathan A.S. Webster ,&nbsp;Matthew Glenn ,&nbsp;Nicholas Owen ,&nbsp;Liza Forbes ,&nbsp;Shane P. Usher ,&nbsp;Jay R. Black ,&nbsp;Peter J. Scales ,&nbsp;Anthony D. Stickland","doi":"10.1016/j.powtec.2025.121081","DOIUrl":"10.1016/j.powtec.2025.121081","url":null,"abstract":"<div><div>Understanding the platy morphology of gangue minerals like talc is crucial for improving flotation operation efficiency, which is essential for beneficiation of low-grade copper ores. A practical method for quantifying the platy morphology of talcs using X-ray diffraction patterns is presented. The platy morphologies of talcs from various geological origins were quantified using an XRD morphology index (MI) that considers the aspect ratio as measured by the relative intensities of (004) and (020) Bragg reflections. Comparisons with the XRD preferred orientation (PO) correction, and the inverse aspect ratio (AR) from X-ray micro-computed tomography (micro-CT) and scanning electron microscopy (SEM), were conducted to validate the XRD-determined MI. There was a moderate correlation of 53.1 % between MI and the SEM-determined 2D inverse AR. The inverse AR results of the micro-CT did not correlate with that from the SEM. However, a strong correlation was observed between MI and XRD-determined PO correction and micro-CT-determined 3D inverse AR, with R² values of 90.3 % and 97.1 %, respectively. The results indicate that XRD, assuming adequate sample preparation, is a promising, feasible and rapid way to quantify the platy morphology of talc, whereas 2D SEM cannot quantify platiness due to the limitations of 2D projection and analysis of non-spherical particles.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"460 ","pages":"Article 121081"},"PeriodicalIF":4.5,"publicationDate":"2025-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143908194","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}

{"title":"High shear granulation of clay: Effect of experimental variables","authors":"Maurizio Vespignani ,&nbsp;Ilaria Zanoni ,&nbsp;Lara Faccani ,&nbsp;Simona Ortelli ,&nbsp;Magda Blosi ,&nbsp;Andreana Piancastelli ,&nbsp;Cesare Melandri ,&nbsp;Irini Furxhi ,&nbsp;Anna Luisa Costa","doi":"10.1016/j.powtec.2025.121082","DOIUrl":"10.1016/j.powtec.2025.121082","url":null,"abstract":"<div><div>This study investigates the influence of high-shear mechanical granulation parameters on the properties and distribution of a clay-based granulated powder population. The granulation parameters examined as design variables include granulation time, impeller speed, liquid addition rate, rotation mode, and binder agent incorporation. Our findings reveal significant behavioral differences across all parameters when comparing hydrophilic bentonite clays to hydrophobic synthetic hydrotalcite. For hydrophilic clays, the liquid-to-solid ratio is identified as the most critical variable, whereas it exerts minimal impact on hydrophobic hydrotalcite. This suggests the presence of a delicate balance between growth and breakage mechanisms in hydrophobic powders, involving the formation of water droplets that encapsulate particles, aligned with an increased swelling ratio. Furthermore, the addition of an acrylic binder to the bentonite mixture enhances open porosity without affecting compressive strength. These results highlight the need for tailored process modifications in the design of granulated clay-based advanced materials.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"460 ","pages":"Article 121082"},"PeriodicalIF":4.5,"publicationDate":"2025-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143916298","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}

{"title":"Manufacturing softpellets using triboelectric agglomeration of fine powders on a vibrated inclined plane: Method and application to dry powder inhalion","authors":"Eva Gresse ,&nbsp;Thomas Gemine ,&nbsp;Lena Renauld ,&nbsp;Brigitte Evrard ,&nbsp;Geoffroy Lumay ,&nbsp;Anna Lechanteur","doi":"10.1016/j.powtec.2025.121070","DOIUrl":"10.1016/j.powtec.2025.121070","url":null,"abstract":"<div><div>Fine powders are required in many industrial applications, but their poor flow properties make handling and processing challenging. In Dry Powder Inhalation (DPI), for instance, inhaled particles must have an aerodynamic diameter between 1 and 5 μm to ensure therapeutic efficiency. However, these fine powders are difficult to manipulate, particularly during capsule or reservoir filling. To address this issue, we propose a set-up to form brittle agglomerates, referred to as softpellets, which exhibit enhanced flowability while maintaining the ability to break up when needed. Our method is based on a vibrating stainless steel inclined plane on which fine particles flow under controlled vibration, leading to agglomeration. The powder is dispensed after being sieved, and the process parameters have been optimized. For that, two powders were used: a fine lactose (Inhalac® 500) and a homemade engineered spray-dried powder. Experimental results suggest that triboelectric charging plays a key role in particle cohesion, driving agglomeration. The resulting softpellets are spherical, approximately 800 μm in diameter, and exhibit significantly improved flowability compared to the initial powder. Their mechanical robustness was assessed using a texture analyzer and laser diffraction under varying pressures. Finally, low-inspiratory flow impactor analyses confirm that the agglomerates are effectively released from the capsule device and dissociate upon inhalation, achieving a fine particle fraction of nearly 60 %. This study demonstrates a promising strategy for enhancing the flowability of micronized powders without the addition of binders or other excipients. While this proof-of-concept was developed for DPI formulations, the approach could be extended to other pharmaceutical or industrial powder applications.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"460 ","pages":"Article 121070"},"PeriodicalIF":4.5,"publicationDate":"2025-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143894530","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}

{"title":"Discrete element simulation of dry adhesive granular flow in a vertical pipe","authors":"Xin Gao ,&nbsp;Eric J.R. Parteli ,&nbsp;Fengxian Fan","doi":"10.1016/j.powtec.2025.121079","DOIUrl":"10.1016/j.powtec.2025.121079","url":null,"abstract":"<div><div>The transportation and storage of granular materials with adhesive properties often involves particulate flow through narrow pipes, which is accompanied by still poorly understood dynamic behavior. Due to the difficulty in achieving a quantitative understanding of such flows based solely on experiments, here we perform particle-based numerical simulations of vertical pipe flows of adhesive granular materials using the discrete element method (DEM). Our simulations unveil different regimes of vertical pipe flow depending on the pipe-to-particle diameter ratio and the interparticle adhesive strength. Surprisingly, we find that the particle mass flow rate through the pipe increases substantially with this adhesive strength. This rather counterintuitive result is caused by an enhanced tendency of the particles to form stable agglomerates around the pipe symmetry axis, thus leading to reduced interaction of the particles with the frictional pipe walls. By contrast, incorporation of particle-wall adhesive interactions leads to exactly the opposite behavior, with such interactions dictating the granular dynamics in the pipe and leading to lower mass flow rate values compared to cohesionless flows. Furthermore, we show that the different flow regimes are associated with distinct spatiotemporal patterns of the granular solid fraction along the pipe axis (density waves). Therefore, our results provide theoretical references for future experimental research and application of adhesive granular flows through narrow pipes.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"460 ","pages":"Article 121079"},"PeriodicalIF":4.5,"publicationDate":"2025-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143898693","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}

{"title":"Corrigendum to “Capture characteristics comparison between magnetic and non-magnetic particles in centrifugal dry magnetic separation” [Powder Technology 458 (2025) 121005]","authors":"Xiaoqian Liu ,&nbsp;Luzheng Chen ,&nbsp;Xiangjun Ren ,&nbsp;Fan Yi","doi":"10.1016/j.powtec.2025.121060","DOIUrl":"10.1016/j.powtec.2025.121060","url":null,"abstract":"","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"460 ","pages":"Article 121060"},"PeriodicalIF":4.5,"publicationDate":"2025-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144088988","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}

{"title":"Minimum mesh quality for reliable morphology characterization of 3D soil particles","authors":"Chen-Xi Tong ,&nbsp;Jia-Jun Li ,&nbsp;Quan Sun ,&nbsp;Feng He ,&nbsp;Sheng Zhang ,&nbsp;Wan-Huan Zhou ,&nbsp;Daichao Sheng","doi":"10.1016/j.powtec.2025.121062","DOIUrl":"10.1016/j.powtec.2025.121062","url":null,"abstract":"<div><div>Remarkable advancements in computer-based optical imaging technology have greatly enhanced particle shape quantification and characterization with high efficiency. However, the varying sensitivity of different particle shape descriptors to mesh quality is often overlooked, which can affect the reliability and accuracy of particle shape characterization. In response to this issue, this study systematically investigates the impact of three-dimensional (3D) particle mesh quality on seven commonly used shape descriptors, showing that lower mesh quality can lead to greater deviations in 3D particle shape characterization. These shape descriptors are then categorized according to their scale and sensitivity to mesh quality. From this analysis, minimum mesh quality criteria are established to ensure reliable particle shape characterization. The applicability of the criteria to particles with diverse forms is evaluated, and further validation is conducted using four scanned morphologically featured particles. These findings provide essential technical guidance for determining acceptable levels of 3D particle mesh model simplification in geotechnical engineering applications.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"460 ","pages":"Article 121062"},"PeriodicalIF":4.5,"publicationDate":"2025-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143898695","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}