Powder Technology最新文献

{"title":"Effect of ethanol on in-situ deposition of nano calcium carbonate on cotton fibers","authors":"Zongbao Han ,&nbsp;Yunli Wang ,&nbsp;Weilin Xu","doi":"10.1016/j.powtec.2025.120837","DOIUrl":"10.1016/j.powtec.2025.120837","url":null,"abstract":"<div><div>In this study, a method was employed to treat cotton fabrics with a mixed calcium hydroxide/ethanol/water solution system following the introduction of carbon dioxide, facilitating the in-situ deposition of nano calcium carbonate (NCC) on the cotton fibers. The findings revealed that the NCC particles formed on the fibers exhibit a diamond-shaped cubic morphology, characteristic of the calcite crystal type, with dimensions ranging from tens to hundreds of nanometers. The addition of ethanol contributes to the formation of NCC, with a maximum increase of about 2 times in calcium element content. The breaking strength of the cotton fabric was notably enhanced after deposition, with the addition of ethanol resulting in an approximate 8–10 % increase in breaking strength, much higher than that of sample without ethanol (∼ 4.2 %). The deposition modification did not significantly alter the chemical or crystalline structure of the cotton fibers. Additionally, the crystallization index of the fibers was improved to a certain degree, without compromising their hydrophilicity, thus not affecting subsequent dyeing and finishing processes. This has introduced a novel avenue for researchers to investigate and enhance the physical and mechanical properties of cotton fiber materials, which is beneficial for expanding their application fields.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"456 ","pages":"Article 120837"},"PeriodicalIF":4.5,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143550817","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":"Investigation of crack self-healing behaviour and its impact on strength and permeability recovery in cemented paste tailings","authors":"Weizhou Quan,&nbsp;Mamadou Fall","doi":"10.1016/j.powtec.2025.120834","DOIUrl":"10.1016/j.powtec.2025.120834","url":null,"abstract":"<div><div>Cemented paste backfill (an engineered mixture of tailings, binder, and water), as one of the sustainable technological innovations for mining waste management, is used extensively around the world as a cementitious construction material in underground mines. The induced cracks within the CPB material tend to severely weaken the integrity and mechanical strength of the CPB structures as well as increase their permeability properties, undermining their safety, serviceability, durability, and environmental performance. However, no studies have been conducted to investigate the autogenous self-healing capability and behaviour of CPB. Therefore, this paper presents the results of an experimental study on the autogenous healing behaviour in CPB material to understand the self-healing mechanism and evaluate the self-healing efficiency through the recovery of mechanical and permeation properties. To this end, the CPB specimens were pre-damaged at different initial curing periods (i.e., 3, 7, and 28 days) and at different pre-damage levels (i.e., 30 %, 50 %, 75 %, 90 %, or 100 % of ultimate compressive strength in the pre-peak phase); then cured with self-healing periods of 1, 7, 28 or 90 days. Mechanical and hydraulic conductivity tests were performed on the pre-damaged specimens to monitor the self-healing changes. The results demonstrate that a significant self-healing capability does exist in the CPB materials due to the formed self-healing products from continuous cement hydration interior of the CPB matrix and carbonation of calcium hydroxide. The mechanical strength and hydraulic conductivity of pre-damaged specimens can be restored to similar values of the control specimens after 7 days and 28 days of self-healing periods, respectively. Furthermore, the study also reveals that the CPB specimens with high pre-damage levels (i.e., 75 %, 90 %, or 100 %) can even achieve up to 42 % higher mechanical strengths than the control specimens after 90 days of the self-healing period, indicating that the initiated cracks within the CPB matrix can ameliorate the hydration reactions favoring the self-healing performance. The results presented in the paper would have significant impacts and practical implications with respect to CPB structure design, mechanical stability, and durability.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"457 ","pages":"Article 120834"},"PeriodicalIF":4.5,"publicationDate":"2025-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143551951","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Inhibition mechanism of an expandable chemical inhibitor on aluminum dust explosions","authors":"Songling Jin,&nbsp;Wei Gao,&nbsp;Mingshu Bi,&nbsp;Haipeng Jiang,&nbsp;Fengyu Zhao,&nbsp;Tianjiao Zhang","doi":"10.1016/j.powtec.2025.120855","DOIUrl":"10.1016/j.powtec.2025.120855","url":null,"abstract":"<div><div>In this study, an expandable chemical inhibitor was development synthesized using the mechanical alloying technique to mitigate aluminum dust explosions. The inhibition mechanism of aluminum dust explosion was further explored through numerical simulations. The results indicate that KHCO₃-EG powder achieved a maximum reduction of 89.85 % for flame propagation velocity. KHCO₃-EG compound powder formed a barrier that obstructed O₂ access and reduced heat transfer effects between powder particles by creating a dense, porous carbon layer with a worm-like structure. KHCO₃-EG compound powder absorbed heat produced during the combustion of aluminum particles, undergoing thermal decomposition to produce K-containing products. Kinetic simulations demonstrated that the composite inhibitor significantly decreased the concentrations of AlO and O, leading to stable O₂ formation. Catalytic cycles (K⇔KO and KO⇔KO₂) further decreased O atoms, lessening collisions between active groups and reducing explosive intensity. The study contributes theoretical and technical support for preventing and controlling aluminum dust explosion disasters.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"457 ","pages":"Article 120855"},"PeriodicalIF":4.5,"publicationDate":"2025-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143562421","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":"Simultaneous measurement of the 3D position, refractive index and droplet size of transparent spherical droplets using three-dimensional rainbow refractometry","authors":"Zhiwen Deng ,&nbsp;Zhiming Lin ,&nbsp;Xuecheng Wu ,&nbsp;Yuxuan Zhao ,&nbsp;Qiwen Jin ,&nbsp;Yingchun Wu ,&nbsp;Yongxin Zhang ,&nbsp;Chenghang Zheng","doi":"10.1016/j.powtec.2025.120818","DOIUrl":"10.1016/j.powtec.2025.120818","url":null,"abstract":"<div><div>In this study, we investigate three-dimensional rainbow refractometry (TDRR) as a method for estimating the 3D position, refractive index, and droplet size of transparent spherical droplets. The principles governing the variation of rainbow signals with axial position under cylindrical lens modulation are elucidated, allowing for estimation of the droplet’s axial position based on fringe rotation angles. We also present a novel calibration technique for absolute scattering angles in TDRR measurements and propose an innovative data processing approach. A comprehensive TDRR system has been constructed to validate measurements of monodisperse water droplet flows. The results indicate that the error in 3D position measurement is less than 3%, while the absolute error in refractive index measurement is below 0.0015 and droplet size errors remain under 5%. As a new technique for simultaneous droplet positioning and multi-parameter assessment, TDRR offers significant advantages for investigating droplet interactions and dynamics in a large space.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"456 ","pages":"Article 120818"},"PeriodicalIF":4.5,"publicationDate":"2025-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143529344","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":"New technology for preparing high sphericity iron powder by hydrogen reduction method","authors":"Min Gan,&nbsp;Yun-can Cao,&nbsp;Hao-rui Li,&nbsp;Xiao-hui Fan,&nbsp;Xing-wei Li,&nbsp;Hua-jiang Wei,&nbsp;Zhong-zheng Huang,&nbsp;Xiao-wei Si,&nbsp;Lin-cheng Liu,&nbsp;Zhi-yun Ji,&nbsp;Zeng-qing Sun,&nbsp;En-di Guo","doi":"10.1016/j.powtec.2025.120859","DOIUrl":"10.1016/j.powtec.2025.120859","url":null,"abstract":"<div><div>Spherical iron powder is a crucial raw material for advanced manufacturing. In this study, it is prepared through ultrafine milling, spray granulation, and hydrogen reduction process with ultra-purity iron concentrate as the raw material. First, we study the effect of reduction temperature on the surface morphology and internal sintering degree of spherical iron powder. Furthermore, we study the variation law of some fundamental performance in different reduction temperatures, such as apparent density, flow rate, spheroidization rate, etc. The results show that the comprehensive performance of iron powder obtained at 750 °C is optimal. Finally, the factors affecting the formation of iron whiskers during the reduction process are revealed. By increasing the reduction rate, we obtained spherical iron powder without iron whiskers on the surface using an experimental atmosphere of 1.0 L/min H₂ and 0.3 L/min Ar, and the mean sphericity is calculated to be 0.9619.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"457 ","pages":"Article 120859"},"PeriodicalIF":4.5,"publicationDate":"2025-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143637322","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":"Fabrication of flaxseed gum modification oxidized corn starch grafted polyacrylic acid liquid dust suppressant with environmental friendliness","authors":"Yang Xiaotian ,&nbsp;Gao Hui ,&nbsp;Ma Yingxia ,&nbsp;Xiao Jun ,&nbsp;Mou Jianchang","doi":"10.1016/j.powtec.2025.120865","DOIUrl":"10.1016/j.powtec.2025.120865","url":null,"abstract":"<div><div>To solve the issue of dust pollution generated during building construction, in the work, using oxidized corn starch (OCS) as base material, acrylic acid (AA) as monomer, and flaxseed gum (FSG) and glycerin (GLY) as modifiers, FSG modification OCS-<em>graft</em>-polyacrylic acid (PAA) composite (OCS-<em>g</em>-PAA/FSG/GLY) as liquid dust suppressant was fabricated by grafting polymerization and hydrogen bonding. The optimum reaction conditions for OCS-<em>g</em>-PAA/FSG/GLY were determined by single factor experiment. The performance test results of OCS-g-PAA/FSG/GLY show that the dust specimens treated with OCS-g-PAA/FSG/GLY could retain water for 12 h at 60 °C, the average hardness of the consolidation layer on the surface of the dust specimen reached 71.4 HA, at a wind speed of 12 m/s, the dust specimen loss rate was only 1.96 %, and the resistance to water corrosion could reach 96.82 %, which is expected to be used for dust control in the field of building construction.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"457 ","pages":"Article 120865"},"PeriodicalIF":4.5,"publicationDate":"2025-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143578159","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":"3D rock fragmentation analysis using lidar, based on point cloud deep learning segmentation and synthetic data","authors":"Mojgan Faramarzi Hafshejani,&nbsp;Kamran Esmaeili","doi":"10.1016/j.powtec.2025.120861","DOIUrl":"10.1016/j.powtec.2025.120861","url":null,"abstract":"<div><div>Accurate online measurement of particle size distribution is crucial in mining, tunnelling, and mineral processing industries to enable intelligent process control and optimization, ultimately enhancing efficiency and productivity. The current method for rock fragmentation relies on 2D image analysis, which is highly dependent on optimal lighting conditions, limiting its applicability and robustness in the challenging lighting environments commonly found in mining. This study diverges from the prevalent 2D image and photogrammetry approaches in rock fragmentation analysis, and pioneers a novel approach by harnessing laser scanner data for point cloud segmentation, offering a promising solution to overcome the limitations of image analysis techniques. By leveraging laser scanner data, a robust framework for rock fragmentation analysis is developed that is tailored to the specific challenges related to lighting situations. To avoid the laborious task of collecting and labelling point cloud datasets, this research introduces an innovative approach of using synthetic labeled datasets of scanned rockpiles. A platform is developed to automatically create and scan labeled point clouds of rock piles, facilitating the utilization of transfer learning. The synthetic 3D dataset was used to train a deep learning model for precise segmentation of rock instances in three-dimensional coordinates, providing an accurate representation of the rock object in 3D. The accuracy of the developed predictive model was tested and validated on experimental laser scanning data of three different rock piles. The proposed method depends on coordinate data instead of RGB information, rendering it particularly applicable in challenging conditions such as underground mining, night shifts, or situations where maintaining optimal lighting conditions is difficult or costly. The findings present a significant leap forward in rock fragmentation analysis, opening avenues for enhanced practices in diverse mining environments.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"456 ","pages":"Article 120861"},"PeriodicalIF":4.5,"publicationDate":"2025-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143550816","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 of amorphous powder cores with increased magnetic saturation and permeability","authors":"Ángel Sota Muñoz ,&nbsp;Nerea Burgos ,&nbsp;Valentina Zhukova ,&nbsp;Ahmed Talaat ,&nbsp;Julián González ,&nbsp;Mikel Osinalde ,&nbsp;Jose Manuel Martín","doi":"10.1016/j.powtec.2025.120847","DOIUrl":"10.1016/j.powtec.2025.120847","url":null,"abstract":"<div><div>Soft magnetic composites (SMCs) made of amorphous powder typically result in low densities due to the brittleness of the amorphous, thereby providing poor magnetic properties. For this reason, this work focuses on mixing the particle sizes of amorphous powders to increase the packing, and therefore the compact density and magnetic properties. Enhanced packing density is obtained by mixing particle size fractions of 20–45 μm and 0–10 μm in a proportion of 73:27 vol%, respectively. Properties of the SMC made from the mixed fractions are compared with those made from each fraction using an Fe-Co composition ((Fe_0.425 Co_0.30 Si_0.125 B_0.15)_96.5Nb₃Cu_0.5). The mixing of fractions shows an increase of 10 % in density, thus reducing interparticle voids and enhancing magnetic saturation and permeability. By contrast, lower power losses are provided by the SMC fabricated with the 0–10 μm fraction due to lower eddy currents. A comparative study on magnetic properties and power losses of SMCs made from the mixed fractions for four compositions reveal that highest permeability (μ’ = 34.5) is achieved with composition (Fe_0.46 Co_0.30 Si_0.09 B_0.10 P_0.05)_96.5Nb₃Cu_0.5 and lowest power losses at high frequency (3437 mW/cm³ at 1 MHz and B = 50 mT) with Fe_72.5 Si_12.5 B₁₅ after annealing and subsequent resin infiltration.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"456 ","pages":"Article 120847"},"PeriodicalIF":4.5,"publicationDate":"2025-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143550821","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":"Influence of ballast gradation on repose angle using large-scale hopper flow tests and DEM simulation","authors":"Cheng Chen ,&nbsp;Shao-shuo Li ,&nbsp;Jun-feng Li ,&nbsp;Lei Zhang ,&nbsp;Juan Yang","doi":"10.1016/j.powtec.2025.120852","DOIUrl":"10.1016/j.powtec.2025.120852","url":null,"abstract":"<div><div>This study investigates the influence of ballast gradation on the repose angle through a series of large-scale hopper flow tests and discrete element method (DEM) simulations. Bulk-scale and micro analyses of the entire ballast pile formation process reveal three stages: platform-stacking, peak-stacking, and peak-shaving, with particle interlocking during these stages playing a crucial role in establishing the angle of repose. Results indicate that ballast gradation significantly affects the repose angle, the maximum repose angle is observed at <em>d</em>₅₀ = 40.0 mm, within the tested range of 36.8 mm to 45.0 mm. As the gradation of the ballast transitions from uniform to non-uniform, the repose angle initially increases and then decreases, peaking at <em>d</em>₅₀ = 40.0 mm and <em>C</em>_u = 1.46. The spatial distribution of particles within the ballast pile follows a distinct pattern, large particles within the ballast pile is relatively uniform, while small and medium particles are more concentrated in the core regions. A better particle gradation allows smaller particles to fill the voids between larger particles, thereby optimizing the load distribution between strong and weak force chains. This research underscores the importance of proper gradation for ensuring stability and effective load-bearing capacity in ballast systems.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"456 ","pages":"Article 120852"},"PeriodicalIF":4.5,"publicationDate":"2025-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143550824","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":"Numerical simulation of proppant transport with multi-stage alternating injection in CO2 hybrid fracturing","authors":"Yong Zheng ,&nbsp;Zhigang Wang ,&nbsp;Haoyu Chen ,&nbsp;Hai Huang ,&nbsp;Jun Ni ,&nbsp;Liangbin Dou ,&nbsp;Haizhu Wang ,&nbsp;Bin Wang","doi":"10.1016/j.powtec.2025.120840","DOIUrl":"10.1016/j.powtec.2025.120840","url":null,"abstract":"<div><div>Effective proppant placement has been one of the key objectives of reservoir stimulation. CO₂ hybrid fracturing is promising for the economic production of unconventional reservoirs, however, there is a lack of understanding of proppant transport within the rough fractures associated with it. In this study, a validated CFD-DEM model is used to simulate proppant transport with multi-stage alternating injection in CO₂ hybrid fracturing, focusing on evaluating the advantages of alternating injection within a rough fracture as well as the influence laws of key parameters. The simulation results show that the use of multi-stage alternating injection of proppant with different fluids in CO₂ hybrid fracturing can obtain better proppant placement than single fluid continuous pumping, with 36.4 % and 4.4 % higher proppant dune lengths, and 3.51 % and 2.3 % higher dune placement rate than single CO₂ pumping and water pumping, respectively. The optimal number of injection stages in multi-stage alternating injection of proppant is 4, while the optimal segment plug length ratio of CO₂ and water is 3:1. The best dune length and placement rate are obtained when the CO₂ segment plug is injected at a velocity of 0.1 m/s, but when the CO₂ segment plug is injected at a velocity of 0.2 m/s, it is favorable for the safety of the pipeline and equipment during fracturing operation.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"456 ","pages":"Article 120840"},"PeriodicalIF":4.5,"publicationDate":"2025-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143550825","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}