Powder Technology最新文献

{"title":"Investigation on the breakage and seepage characteristics of layered coal with high temperatures impacted by water jets","authors":"Shirong Cao ,&nbsp;Xiaojun Wang ,&nbsp;Huarui Hu ,&nbsp;Ting Huang","doi":"10.1016/j.powtec.2025.121236","DOIUrl":"10.1016/j.powtec.2025.121236","url":null,"abstract":"<div><div>The application of water jets in coalbed methane development is manifested by pressurizing and gathering energy from the liquid and then spraying it from the nozzle to achieve cutting grooves and drilling in the reservoir to enhance reservoir permeability. The breakage and permeability transformation of high-temperature layered coal using water jets needs to be carefully studied as it directly affects the commercial development of deep coalbed methane (CBM) resources using water jet technology. In this study, experiments on coal breakage by water jet were conducted using a special apparatus under controlled conditions (temperature: 30/75 °C; jet pressure: 20 MPa; bedding angle: 0–90°) to quantitatively analyze the macroscopic fragmentation characteristics and damage mechanisms of high-temperature layered coal. The results demonstrated that the fragmentation volume exhibited a clear peak value of 31.3 or 33 cm³ at a bedding angle of 45°. High-temperature coal undergoes thermal damage to connected bedding planes due to matrix shrinkage, and the thermal fracture between bedding planes converges and connects under water jets. Therefore, many complex gas permeation channels are formed, making them less susceptible to the influence of principal stress in a single direction when the angle of jet impact on coal bedding at around 45° or 60°, which helps to form a long-term stable coalbed methane seepage channel and achieve CBM production rising.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"464 ","pages":"Article 121236"},"PeriodicalIF":4.5,"publicationDate":"2025-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144307695","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":"Research on bubble-particle tangential detachment behavior: Experiments and models","authors":"Hongji Chen ,&nbsp;Wenqing Shi ,&nbsp;Shihao Ding ,&nbsp;Yaowen Xing ,&nbsp;Xiahui Gui","doi":"10.1016/j.powtec.2025.121229","DOIUrl":"10.1016/j.powtec.2025.121229","url":null,"abstract":"<div><div>Bubble-particle detachment is an important stage in mineral flotation process, and it restricts the final recovery of flotation. Tangential detachment is a typical way of bubble-particle detachment. Compared with normal detachment, the mechanism of bubble-particle tangential detachment is more complex. In recent years, it has been recognized that contact angle distribution and contact angle hysteresis have important effects on tangential detachment process. However, the behavior mechanism of tangential detachment process based on theoretical derivation and experimental verification is not clear. In this paper, several kinds of traditional contact angle distribution models are discussed and derived, and their shortcomings are analyzed. Based on the test results of contact angle and formula derivation, a more suitable contact angle relationship model with the azimuth angle, forward and backward contact angle is obtained. Finally, a tangential capillary force model is established based on the deduced contact angle distribution model, and the reliability of the model is verified by comparing the actual tangential capillary force maximum value with the calculated value of the model under corresponding conditions, to realize the quantitative analysis of the behavior of the bubble-particle tangential detachment process.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"464 ","pages":"Article 121229"},"PeriodicalIF":4.5,"publicationDate":"2025-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144298040","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":"Ultimate particle size distribution of granular materials based on fractal scaling: Definition and its application","authors":"Jiru Zhang,&nbsp;Biwen Zhang","doi":"10.1016/j.powtec.2025.121232","DOIUrl":"10.1016/j.powtec.2025.121232","url":null,"abstract":"<div><div>The concept of relative breakage has been increasingly used for the quantitative analysis of particle breakage in granular materials, and its calculation relies significantly on the ultimate particle size distribution. However, a precise characterization of this distribution remains unresolved. This study introduced a novel concept of the ultimate particle size distribution, defined by the ultimate space-filling capacity of the particles, employing fractal theory. High-pressure confined compression tests were conducted on quartz sand and gravel to investigate the evolution of the particle size distribution due to particle breakage. Fractal scaling served as a modeling tool to track the change in the particle number during particle breakage. The findings revealed a transition from diverse initial distributions to a fractal distribution with increasing breakage. A finite particle size scale exhibited an ultimate fractal distribution, where the ultimate fractal dimension was a function calculating the ratio of the minimum to maximum particle size, with values in the range of 1.5 to 3. The ultimate fractal distribution characteristics depended on the measurement scale of the maximum and minimum particle sizes, regardless of the uniformity of the initial distribution. The transition from a particle size distribution to a fractal distribution in the confined compression tests was characterized by a constant ratio between volumetric strain and relative breakage. This ratio held promise for accurately estimating relative breakage. This study provides insights into the ultimate particle size distribution and enhances relative breakage measurement in granular materials.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"464 ","pages":"Article 121232"},"PeriodicalIF":4.5,"publicationDate":"2025-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144298039","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":"Study on silicon separation from diamond wire saw silicon slurry waste: Effect of surfactant on separation performance","authors":"Yongze Zhu ,&nbsp;Shicong Yang ,&nbsp;Keqiang Xie ,&nbsp;Kuixian Wei ,&nbsp;Wenhui Ma","doi":"10.1016/j.powtec.2025.121239","DOIUrl":"10.1016/j.powtec.2025.121239","url":null,"abstract":"<div><div>The separation speed of diamond wire saw silicon slurry (DWSSS) waste is slow and the recovery rate is low. Therefore, to enhance the separation rate and recovery rate of silicon in DWSSS, this study investigates the effects of five surfactants on the DWSSS separation process. The results demonstrated that cetyltrimethylammonium bromide (CTAB) emerged as the most effective surfactant among the five surfactants in this study. At the dosage of 5 %, elevating the silicon separation rate from 0.9 × 10⁻³ mL/(s × cm²) to 3.6 × 10⁻³ mL/(s × cm²), while simultaneously boosting the recovery rate from 61 % to 85 %. The study of adsorption behavior and surface properties showed that the charge of the silicon particle changed from negative to positive under the effect of CTAB adsorption. Furthermore, the CTAB reduced the surface tension and improving the separation efficiency. The feasibility of CTAB in promoting silicon separation from DWSSS was further validated by the pilot experiment with a recovery rate of 98 %.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"464 ","pages":"Article 121239"},"PeriodicalIF":4.5,"publicationDate":"2025-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144280239","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":"A novel coarse-grained discrete element method for simulating failure process of strongly bonded particle materials","authors":"Gaohan Jin ,&nbsp;Zongqing Zhou ,&nbsp;Yuhan Liu ,&nbsp;Chenglu Gao ,&nbsp;Huaqing Ma ,&nbsp;Zhiwei Yang ,&nbsp;Yi Jing ,&nbsp;Hanchen Tu","doi":"10.1016/j.powtec.2025.121212","DOIUrl":"10.1016/j.powtec.2025.121212","url":null,"abstract":"<div><div>Strongly bonded particle materials are widely used in energy engineering, geotechnical engineering and other fields. However, there is still a lack of an effective approach for large-scale DEM simulation of strongly bonded particle materials with low computational cost. To address the excessive computational cost in large-scale DEM simulation of strongly bonded particle materials, this study proposes a coarse-grained method based on energy density conservation principle, comprehensively incorporating multiple energy forms, including elastic strain energy, damping dissipation energy, and rolling friction energy. Scaling relations of microscopic parameters in the coarse-grained system are derived to ensure the conservation of all forms of energy density mappings within the spring and damping elements during the particle scaling process. Numerical simulations were performed on both cylindrical specimens and single-perforated plate models under loading compression using the developed coarse-grained method. Results demonstrate that the coarse-grained system accurately reproduces the key physical parameters of the original system, including failure modes, damage characteristics, energy density, and mechanical properties. In contrast, simulations without coarse-grained system exhibited significantly higher errors, with magnitudes ranging from several tens up to 130 times greater than those of the coarse-grained system, thus validating the accuracy and effectiveness of the proposed method.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"464 ","pages":"Article 121212"},"PeriodicalIF":4.5,"publicationDate":"2025-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144313761","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":"Exploring a Ni-Co-Mn oxide precursor route via flame-assisted spray pyrolysis for the preparation of ternary cathode materials","authors":"Junlei Wang,&nbsp;Shilong Li,&nbsp;Wen Du,&nbsp;Yunfei Xu,&nbsp;Jinyu Li,&nbsp;Kun Wang","doi":"10.1016/j.powtec.2025.121233","DOIUrl":"10.1016/j.powtec.2025.121233","url":null,"abstract":"<div><div>The conventional co-precipitation wet chemical method for preparing LiNi_xCo_yMn_1-x-yO₂ (NCM) cathode materials for lithium-ion batteries starts with the synthesis of Ni-Co-Mn hydroxide precursors, which are then calcined at high temperatures and thermally decomposed into oxides, followed solid-state reacting with lithium sources to obtain the NCM cathode materials. However, this hydroxide precursor route has several drawbacks, including multiple processing steps, pollution from strong bases, significant generation of liquid waste, and high energy consumption. In the current study, the Ni-Co-Mn oxide precursor route is explored via flame-assisted spray pyrolysis (FASP), which offers prompt reaction time, very few steps, and equipment without producing liquid wastes. Specifically, two types of oxide precursors, NiCoMnO₄ and Ni_0.8Co_0.1Mn_0.1O_1.1, were synthesized by FASP utilizing the co-flow diffusion flame burner system, which were subsequently mixed with cost-effective lithium carbonate (Li₂CO₃) and subjected to calcination, resulting in the preparation of two types ternary NCM cathode materials, NCM111 and NCM811. Characterization results demonstrate that NiCoMnO₄ features a spherical mesoporous structure with a smooth surface, and a spinel-dominated composite oxide structure, whereas Ni_0.8Co_0.1Mn_0.1O_1.1 exhibits a rough particle surface with a predominant rock salt phase NiO structure. Electrochemical test results show that NCM111 and NCM811 cathode materials exhibited excellent cycling stability, showing capacity retention of 88.5 % and 87.1 %, respectively, after 100 cycles, outperforming that of commercial counterparts and conventional synthesis approaches documented in literature. Thus, the Ni-Co-Mn oxide precursor route via FASP establishes a viable approach for preparing ternary NCM cathode materials</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"464 ","pages":"Article 121233"},"PeriodicalIF":4.5,"publicationDate":"2025-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144280241","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":"Prediction and inversion methods for gas atomization metal powder size distribution inspired by fine tuning the large-scale pre-trained language models","authors":"Xuchen Song,&nbsp;Xiaoyi Chen,&nbsp;Yizhao Li,&nbsp;Liujuan Zhu","doi":"10.1016/j.powtec.2025.121252","DOIUrl":"10.1016/j.powtec.2025.121252","url":null,"abstract":"<div><div>Powder size distribution plays an important role in mechanical properties of metallic components produced through additive manufacturing. This study introduces the novel prediction and inversion methods on powder size distribution during gas atomization. Both methods are inspired by fine tuning the large-scale pre-trained language models, which are comprised of Backpropagation, Genetic Algorithm, and Low Rank Adaptation (BpGA-LoRA) algorithm. In both methods, BpGA serves as the pre-trained model, while LoRA is employed as the fine-tuning model. The results demonstrate their superior regression performance on powder size distribution during gas atomization. In particular, when tackling complex regression challenges, such as simultaneously considering both effects of process parameters and nozzle geometry, the BpGA-LoRA-based predication method outperforms the traditional BpGA-based method, achieving a relative error reduction of 9.10 % for the training set and 6.56 % for the validation set. Additionally, the Earth Mover's Distance (EMD) is significantly decreased by 0.0177 for the training set and 0.0239 for the validation set. Similarly, the BpGA-LoRA model, when extended to the inversion method on powder size distribution affected by both effects of process parameters and nozzle geometry, delivers a relative error reduction of 6.12 % for the training set and 4.65 % for the validation set, as compared with the traditional BpGA model. Therefore, the proposed BpGA-LoRA model would not only enhance the development of powder production in additive manufacturing, but also open new avenues for predictive and inverse solutions in various industrial sectors.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"464 ","pages":"Article 121252"},"PeriodicalIF":4.5,"publicationDate":"2025-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144307699","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":"Study on the inert effect of gas-solid two-phase composite system on aluminum dust explosion","authors":"Runzhi Li ,&nbsp;Yinghui Zhang ,&nbsp;Mengting Cao ,&nbsp;Xu Chen ,&nbsp;Xiao Liu ,&nbsp;Kaiyue Jia ,&nbsp;Mingshuai Liu ,&nbsp;Dechen Wang ,&nbsp;Xiao Wang ,&nbsp;Caihua Shi","doi":"10.1016/j.powtec.2025.121250","DOIUrl":"10.1016/j.powtec.2025.121250","url":null,"abstract":"<div><div>The occurrence of aluminum dust explosion accidents, seriously damages the security of people's lives and property, restricting the healthy and sustainable development of related industries. To prevent the occurrence of aluminum dust explosion accidents, this study investigates the effects of three solid inert agents (Al₂O₃, NaH₂PO₄, Mg(OH)₂), two gas inert agents (CO₂, N₂), and gas-solid two-phase inert agents on the explosion characteristics of aluminum dust and reveals the inert mechanism. The results demonstrated that the Minimum Significant Inert Concentration of Al₂O₃, NaH₂PO₄, and Mg(OH)₂ for aluminum dust explosion were 170 %, 150 %, and 90 %, respectively, and the Minimum Complete Inert Concentration for aluminum dust explosion were 300 %, 290 %, and 350 %, respectively. When the inert concentration is lower than 150 %, the inert effect is Mg(OH)₂, NaH₂PO₄, and Al₂O₃ in descending order. When the inert concentration is higher than 150 %, the inert effect was NaH₂PO₄, Al₂O₃, and Mg(OH)₂ in descending order. For the same gradient of inert volume fraction, the decrease in the explosion pressure of aluminum dust is greater under CO₂ than under N₂. However, the inert effect is achieved by consuming large quantities of highly concentrated gas inert agents. The addition of gas-solid two-phase inert agents has a synergistic inert effect on the explosion pressure and pressure rise rate, which reduces the amount of solid inert agent and gas inert agent added. The inert mechanism of inert substances in the explosion of aluminum dust is dominated by physical inert. The study results will have important theoretical guidance for dust explosion protection.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"464 ","pages":"Article 121250"},"PeriodicalIF":4.5,"publicationDate":"2025-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144298042","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":"Design of a streamlined structure to minimize seed damage in high-speed centrifugal seed metering devices","authors":"Chuan Li ,&nbsp;Dongxing Zhang ,&nbsp;Li Yang ,&nbsp;Tao Cui ,&nbsp;Xiantao He ,&nbsp;Kailiang Zhang ,&nbsp;Zhimin Li ,&nbsp;Hongsheng Li ,&nbsp;Shulun Xing ,&nbsp;Jiaqi Dong ,&nbsp;Yeyuan Jiang ,&nbsp;Xiaoshuang Zhang ,&nbsp;Wei Wu ,&nbsp;Chuankuo Zhang","doi":"10.1016/j.powtec.2025.121251","DOIUrl":"10.1016/j.powtec.2025.121251","url":null,"abstract":"<div><div>In the high-speed centrifugal seed metering device, seeds are prone to damage due to collisions and friction with the mechanical structure during operation. To reduce seed damage, this study designs a streamlined structure, including an annular chamber, a terminal arc shell at the seed-clearing outlet, and a gradually transitioning seed-returning surface. Simulation analysis is conducted by combining the discrete element method (DEM) and computational fluid dynamics (CFD) to optimize the key structural parameters. Comprehensive tests on seed breakage rate, damage rate, and seeding performance are performed through bench tests and germination tests to verify the effectiveness of the streamlined structure. Field tests were further employed to assess the seeding performance and energy consumption of the high-speed centrifugal seed metering device. The results of germination and bench tests showed a seed breakage rate of 0.28 % and a damage rate of 1.51 %, with excellent seeding quality and stability, demonstrating the streamlined structure's capability to effectively reduce seed damage. Field test results indicated that at seeding speeds of 12 km/h, 15 km/h, and 18 km/h, the omission rate was less than 4 %, the multiple rate was below 6 %, and the quality rate exceeded 91 %, confirming the reliable and effective seeding performance of the device. Compared to air-suction seed metering devices, the high-speed centrifugal seed metering device demonstrated more stable seeding performance under high-speed conditions, making it better suited for high-speed precision seeding. Additionally, its energy consumption was less than 8 % of that of air-suction seed metering devices, significantly reducing energy requirements.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"464 ","pages":"Article 121251"},"PeriodicalIF":4.5,"publicationDate":"2025-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144298041","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":"In-line measurement to determine high shear wet granulation end point to generate desired tablet properties","authors":"Issa Munu ,&nbsp;Jason Crooks ,&nbsp;Kendal Pitt ,&nbsp;Christopher Windows-Yule ,&nbsp;Andrew Ingram","doi":"10.1016/j.powtec.2025.121254","DOIUrl":"10.1016/j.powtec.2025.121254","url":null,"abstract":"<div><div>High shear wet granulation (HSWG) is widely used in tablet manufacturing because it enhances flowability, powder handling, process run time, size distribution, and prevents segregation. In-line process analytical technology captures particle dynamics and provides real-time data to understand and monitor the HSWG process. The purpose of this study is to use an in-line force probe to determine the granulation end point of a high shear wet granulation process in which the formulation is constant and varying wet massing time. Furthermore, this research provided an understanding of the granule growth mechanisms during the granulation process, revealing instances of granule formation stages such as wetting and nucleation, consolidation and breakage. In addition, 1st derivative of the force is used to characterise the high shear wet granulation process capturing the change of force during the entire process. The result shows that the force profile are reproducible at different wet massing time. The granule properties such as size distribution, density, and percentage of lumps generated at the end of the granulation process varies with changes in the granulation wet massing time. The granulation end point is 150 s of wet massing generates granules with the optimal properties to produce the desired tablet critical quality attribute such as tensile strength and solid fraction also yield the least percentage of lumps at the end of the high shear wet granulation process.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"464 ","pages":"Article 121254"},"PeriodicalIF":4.5,"publicationDate":"2025-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144271206","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}