Powder Technology最新文献

Effect of grinding methods on slime dissociation characteristics and flotation kinetics of coking coal

IF 4.5 2区工程技术

Powder Technology Pub Date : 2024-11-28 DOI: 10.1016/j.powtec.2024.120508

Rui Gu , Chaoqun Li , Qifa Lu , Zheng Tong , Xiangyun Sun , Guangxi Ma , Xiangning Bu , Jie Sha , Guangyuan Xie , Ugur Ulusoy

{"title":"Effect of grinding methods on slime dissociation characteristics and flotation kinetics of coking coal","authors":"Rui Gu , Chaoqun Li , Qifa Lu , Zheng Tong , Xiangyun Sun , Guangxi Ma , Xiangning Bu , Jie Sha , Guangyuan Xie , Ugur Ulusoy","doi":"10.1016/j.powtec.2024.120508","DOIUrl":"10.1016/j.powtec.2024.120508","url":null,"abstract":"<div><div>Despite extensive research on the connection between coal flotation kinetics and particle size, little is known about the shape effect. To fill this gap, this study aims not only to explore dissociation characteristics and particle shape properties resulting from the grinding of coking coal in a planetary ball mill (PBM) and a vertical shaft impact crusher (VSIC) but also to investigate their effects on flotation kinetics. Moreover, for the first time in the literature, shape, kinetic rate constant, and bubble loading capacity (hydrophobicity) properties of coking coal products ground in two different mills were compared by shape characterization, flotation kinetics, and single bubble loading tests, respectively. The findings are: (1) Compared to PBM, VSIC produced rounder-shaped particles with a better communition selectivity, (2) Since PBM's flotation rate constant values (Km) were higher than VSIC's, the particles produced by the PBM exhibit a favorable aspect ratio for faster flotation.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"452 ","pages":"Article 120508"},"PeriodicalIF":4.5,"publicationDate":"2024-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142746521","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

Structural characteristics of cement-based tail fill with sodium dodecyl sulfate, azodicarbonamide, and dodecyl trimethyl ammonium bromide

IF 4.5 2区工程技术

Powder Technology Pub Date : 2024-11-28 DOI: 10.1016/j.powtec.2024.120507

Tingting Jiang , Shuai Cao , Erol Yilmaz

{"title":"Structural characteristics of cement-based tail fill with sodium dodecyl sulfate, azodicarbonamide, and dodecyl trimethyl ammonium bromide","authors":"Tingting Jiang , Shuai Cao , Erol Yilmaz","doi":"10.1016/j.powtec.2024.120507","DOIUrl":"10.1016/j.powtec.2024.120507","url":null,"abstract":"<div><div>The safety of mine-filled stopes is seriously affected by settlement and uneven pore distribution of cement-based tail fill (CTF). To further improve the mined-out areas' stability, it is found that foaming agents (FAs) can improve CTF's settlement characteristics. To better formulate FA-covered mine backfills (FCTFs), three principal FAs, namely, sodium dodecyl sulfate (SDS), azodicarbonamide (AC), and dodecyl trimethylammonium bromide (DTAB), were embraced in the existing research. Macro/micro properties of FCTF specimens were thoroughly examined by UCS tests and microstructure interpretations. Lab findings illustrate that diverse types of FA enhance CTF effects: DTAB>AC > SDS; DTAB-0.4 %, AC-0.4 % and SDS-0.6 % are the best dosage rates, and equivalent peak intensities are 0.7 MPa, 0.43 MPa and 0.55 MPa, respectively. Compared to None, the strength progress of FCTF specimens increased by 22 %, −27 %, and −7 %, respectively. Besides, FCTF's failure style is observed to happen in the form of shear failure along the loading direction. CTF specimens showed obvious ductility on stress-strain curvature, indicating that FA could well inhibit the expansion of cracks. To sum up, the research results can deliver a new way for comprehensive utilization of tailings.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"452 ","pages":"Article 120507"},"PeriodicalIF":4.5,"publicationDate":"2024-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142746518","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 characterization of uniform polyurea microspheres via an environmental-friendly synthetic process: The swelling and shrinkage phenomena

IF 4.5 2区工程技术

Powder Technology Pub Date : 2024-11-27 DOI: 10.1016/j.powtec.2024.120471

Jiupeng Du, Ying Dai, Pablo Canamas, Pierrette Guichardon

{"title":"Preparation and characterization of uniform polyurea microspheres via an environmental-friendly synthetic process: The swelling and shrinkage phenomena","authors":"Jiupeng Du, Ying Dai, Pablo Canamas, Pierrette Guichardon","doi":"10.1016/j.powtec.2024.120471","DOIUrl":"10.1016/j.powtec.2024.120471","url":null,"abstract":"<div><div>In this work, a non-toxic isocyanate HDB-LV is used for the first time to produce monodispersed polyurea microspheres with a size from 10 to <span><math><mrow><mn>40</mn><mspace></mspace><mi>μ</mi><mi>m</mi></mrow></math></span> via a microfluidic droplet approach. The toxic ethylenediamine which is usually necessary for the synthesis of polyurea, is found to be not adaptable for the formation of polyurea microspheres because it can either cause swelling (at low amine concentration) or deformation (at high amine concentration) of the microspheres. A theoretical mechanism for the swelling phenomenon of microspheres is elucidated. Alternatively, thermal hydrolysis of isocyanates that can generate amines is proven to be very effective for the synthesis of polyurea microspheres. A linear relationship between the sizes of microfluidic droplets and polyurea microspheres is found and discussed quantitatively. In the end, the polyurea microspheres from 2 to <span><math><mrow><mn>40</mn><mspace></mspace><mi>μ</mi><mi>m</mi></mrow></math></span> are characterized to have no obvious scattering effects against UV.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"452 ","pages":"Article 120471"},"PeriodicalIF":4.5,"publicationDate":"2024-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142757342","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

Nanoporous microparticles of cellulose nanofibrils: The effect of fluid bed atmospheric spray freeze drying

IF 4.5 2区工程技术

Powder Technology Pub Date : 2024-11-27 DOI: 10.1016/j.powtec.2024.120502

J.M. Silva , C.C.C. Teixeira , L.A. Tacon , L.V.D. Freitas , A.B. Meneguin , H.S. Barud , L.A.P. Freitas

{"title":"Nanoporous microparticles of cellulose nanofibrils: The effect of fluid bed atmospheric spray freeze drying","authors":"J.M. Silva , C.C.C. Teixeira , L.A. Tacon , L.V.D. Freitas , A.B. Meneguin , H.S. Barud , L.A.P. Freitas","doi":"10.1016/j.powtec.2024.120502","DOIUrl":"10.1016/j.powtec.2024.120502","url":null,"abstract":"<div><div>Cellulose nanofibers are abundant, low-cost, biodegradable and non-toxic materials that are a technological alternative for products in pharmaceutical field. The aim of this study was to investigate the effect of fluid bed atmospheric spray freeze drying on cellulose nanofibers characteristics, and compare to conventional spray and freeze drying methods. The atmospheric spray freeze dried nanofibers had moisture content of 2.3 %, mean size 4.0 μm, circularity of 0.86 and angle of repose of 27.3°. Also, solid state evaluation of atmospheric spray freeze dried cellulose nanofibers and other samples showed very similar chemical and thermal characteristics, but a relative crystallinity of 45.3 %, similar to spray dried powders. Furthermore, the most important feature of atmospheric-spray-freeze-dried cellulose nanofibers is their morphology, since unlike the other methods those resulted in highly nanoporous structures. The atmospheric-spray-freeze-drying of cellulose nanofibers may become a new and attractive alternative for the preparation of microsponges for pharmaceutical applications.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"452 ","pages":"Article 120502"},"PeriodicalIF":4.5,"publicationDate":"2024-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142746519","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

Numerical and experimental study of particle shape effect on pile properties based on a 3D sinter model

IF 4.5 2区工程技术

Powder Technology Pub Date : 2024-11-25 DOI: 10.1016/j.powtec.2024.120496

Meng Li , Yaowei Yu , Henrik Saxén

{"title":"Numerical and experimental study of particle shape effect on pile properties based on a 3D sinter model","authors":"Meng Li , Yaowei Yu , Henrik Saxén","doi":"10.1016/j.powtec.2024.120496","DOIUrl":"10.1016/j.powtec.2024.120496","url":null,"abstract":"<div><div>The research described in this paper studies the effect of particle shape on pile properties such as pile shape, repose angle and porosity through Discrete Element Method (DEM) simulation and small-scale experiments. An actual sinter particle was used as a template, with a three-dimensional (3D) model of it reconstructed from two-dimensional images using the close-range photogrammetry method. This 3D model was then employed to produce 3D-printed particles for experiments and to generate multi-sphere particles for simulations. The key contact parameters of the 3D-printed particles were obtained from experimental measurements and used for pile formation simulations. The results demonstrate that particle shape has a significant impact on the formation and structure of piles. In simulations with eliminated rolling friction coefficient, the repose angle changes significantly initially when the particles transition from sphere to more complex shapes. At growing shape complexity the effect on the pile structures eventually becomes negligible. In bulk-calibrated simulations, porosity exhibits a non-monotonic trend with changes in sphericity. The porosity of particles with sphericity most similar to sinter shows the greatest consistency with experimental porosity. The findings suggest that particle shape has a critical influence on the properties of piles, and the complexity of particle shape has a profound impact on particle behaviour.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"452 ","pages":"Article 120496"},"PeriodicalIF":4.5,"publicationDate":"2024-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142746520","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}

引用次数: 0

Two novel semi-analytical coefficients of restitution models suited for nonlinear impact behavior in granular systems

IF 4.5 2区工程技术

Powder Technology Pub Date : 2024-11-24 DOI: 10.1016/j.powtec.2024.120501

Gengxiang Wang , Zepeng Niu , Yang Liu , Fuan Cheng

引用次数: 0

Numerical study of the dynamic aggregation behaviors of oil droplets in the porous filter media consisting of basalt particles

IF 4.5 2区工程技术

Powder Technology Pub Date : 2024-11-24 DOI: 10.1016/j.powtec.2024.120470

Liang Hou , Cun-Guang Liang , Fu-Xin Ma , Bin Hao , Peng-Cheng Ma , Daihong Kuang , Hui Li

{"title":"Numerical study of the dynamic aggregation behaviors of oil droplets in the porous filter media consisting of basalt particles","authors":"Liang Hou , Cun-Guang Liang , Fu-Xin Ma , Bin Hao , Peng-Cheng Ma , Daihong Kuang , Hui Li","doi":"10.1016/j.powtec.2024.120470","DOIUrl":"10.1016/j.powtec.2024.120470","url":null,"abstract":"<div><div>Porous granular media based on the gravity-driven principle have been proven to be efficient for the separation of oil-water emulsions. However, the complexity of the relevant parameters and the intricate structure of porous media pose great challenges to the design and optimization of the separation process. In this study, the dynamic behavior of oil droplets within the porous structure was numerically analyzed based on the Euler-Euler model and the coupling of the two-phase flow and level set method. The oil-water separation efficiency and droplet trajectory were analyzed under different conditions, considering the deformation of the droplets, kinetic viscosity, and interactions among the droplets. The simulation results show the real-time movement, aggregation, and detachment of oil droplets within the porous filter. The results are useful for understanding the demulsification in a microscopic perspective and provide theoretical guidance for designing more efficient oil-water separation systems.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"452 ","pages":"Article 120470"},"PeriodicalIF":4.5,"publicationDate":"2024-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142746620","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

Application of liquid metal driven-abrasive flow to material removal for the inner surface of channel

IF 4.5 2区工程技术

Powder Technology Pub Date : 2024-11-24 DOI: 10.1016/j.powtec.2024.120487

Yapeng Ma, Baoqi Feng, Kaixiang Li, Lei Zhang

{"title":"Application of liquid metal driven-abrasive flow to material removal for the inner surface of channel","authors":"Yapeng Ma, Baoqi Feng, Kaixiang Li, Lei Zhang","doi":"10.1016/j.powtec.2024.120487","DOIUrl":"10.1016/j.powtec.2024.120487","url":null,"abstract":"<div><div>Gallium-based eutectic liquid metal alloys possess unique properties such as deformability, high electrical conductivity, and low vapor pressure. These characteristics have generated significant interest in their application for stretchable electronics and microelectromechanical systems (MEMS). Precise manipulation of liquid metal within electrolytes is essential to meet specific functional requirements. This study investigates the electrostatic manipulation of liquid metal in an alkaline solution with abrasives for material removal from the inner surfaces of flow channels. The polarization of the double layer at the gallium‑indium alloy and electrolyte interface is analyzed, elucidating the principle of electrolyte propulsion via continuous electrowetting. A theoretical model is developed, and two- and three-dimensional transient and steady-state simulations of the liquid metal-driven abrasive flow are conducted. Results demonstrate that this method effectively removes material from the inner walls of straight channels during cyclic motion. Utilizing continuous electrowetting, an experimental apparatus was designed, where gallium‑indium liquid metal propelled silicon carbide abrasives against PMMA channel walls. Experimental results showed effective material removal, consistent with finite element simulations, confirming the feasibility of this innovative approach.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"452 ","pages":"Article 120487"},"PeriodicalIF":4.5,"publicationDate":"2024-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142746617","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

Numerical study on startup behaviors of dense powder conveying in powder fueled ramjets using modified TFM incorporated with μ(I) rheology theory

IF 4.5 2区工程技术

Powder Technology Pub Date : 2024-11-23 DOI: 10.1016/j.powtec.2024.120488

Shilin Gao, Haibin Zhang, Bofeng Bai

引用次数: 0

An improved method to process the data of optical Fiber signals for identifying the instantaneous flow structure in a gas-solid fluidized bed

IF 4.5 2区工程技术

Powder Technology Pub Date : 2024-11-22 DOI: 10.1016/j.powtec.2024.120475

Weixing Jin, Yuzhen Song, Lingyu Li, Chenglin E, Yiping Fan, Chunxi Lu

{"title":"An improved method to process the data of optical Fiber signals for identifying the instantaneous flow structure in a gas-solid fluidized bed","authors":"Weixing Jin, Yuzhen Song, Lingyu Li, Chenglin E, Yiping Fan, Chunxi Lu","doi":"10.1016/j.powtec.2024.120475","DOIUrl":"10.1016/j.powtec.2024.120475","url":null,"abstract":"<div><div>The instantaneous signals recorded with the optical fiber probe (OFP) directly reflect the hydrodynamic behaviors in fluidized beds. A new data-processing method is put forward to calculate the threshold voltage that is used to discern the bubble phase and emulsion phase. It is found that the threshold voltage is not only related to the flow pattern but also to the color of the used particles. Then the data-processing programs including the Fast Fourier filter have been developed for determining the flow characteristics such as the bubble/particle velocity, bubble/agglomerations chord length, etc. By comparing them with other different methods, the suitability of the proposed method for quantifying the hydrodynamic behaviors in bubble/turbulent fluidized beds is verified. Finally, this method is employed to analyze the characteristics of bubbles, agglomerations and particles in a gas-solid fluidized bed. It is found that the hydrodynamic behaviors of bubbling beds and turbulent beds have significant differences.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"452 ","pages":"Article 120475"},"PeriodicalIF":4.5,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142746517","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