Advanced Powder Technology最新文献

{"title":"Experimental investigation of coarse coal slime fluidization characteristics in three-phase fluidized beds","authors":"Yiqing Zhang ,&nbsp;Jincheng Liu ,&nbsp;Qinglin Yin ,&nbsp;Wenlong Meng ,&nbsp;Shihao Ding ,&nbsp;Yaowen Xing","doi":"10.1016/j.apt.2025.104973","DOIUrl":"10.1016/j.apt.2025.104973","url":null,"abstract":"<div><div>The gas-liquid-solid fluidized beds are highly effective for the separation of coarse coal slime, but their hydrodynamic behavior requires further clarification. This study investigates flow regimes based on real-time pressure fluctuation signals measured using micro-pressure sensors. A comprehensive analysis of pressure signal dispersion was conducted through pressure fluctuation curves and probability density functions. The critical liquid velocity for fluidization was identified at approximately 6*10⁻³ m/s, based on inflection points in pressure drop-velocity curves. Fixed beds exhibit elevated standard deviation, skewness, and kurtosis, signifying instability and non-uniformity, whereas fluidized beds display markedly lower time-domain values. Further refinement of flow regime classification can be achieved through frequency domain analysis, which provides enhanced characterization of particle and bubble dynamics within the fluidized bed system. Fluidized beds exhibit low overall pressure fluctuation energy, with power concentrated in low-frequency regions (&lt;10 Hz) at low gas velocities. When the gas velocity exceeds 1.5*10⁻³ m/s, energy shifts toward higher frequencies (10–20 Hz), reflecting intensified bubble turbulence. This analysis facilitates the further delineation of fluidized bed into the bubble dispersion regime and particle turbulence regime. The investigation of fluidization characteristics clarifies the environmental features in fluidized flotation, thereby laying a solid foundation for further experimental exploration and mechanistic studies of mineral separation in three-phase systems.</div></div>","PeriodicalId":7232,"journal":{"name":"Advanced Powder Technology","volume":"36 8","pages":"Article 104973"},"PeriodicalIF":4.2,"publicationDate":"2025-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144312627","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 method in polymer processing – Method for development of material models","authors":"Jan Landgraeber,&nbsp;Florian Bruening","doi":"10.1016/j.apt.2025.104968","DOIUrl":"10.1016/j.apt.2025.104968","url":null,"abstract":"<div><div>Solids conveying can be a key aspect for polymer processing equipment and is typically simulated utilising the Discrete Element Method (DEM). As material models for the DEM are limited in the accuracy of particle shape representation, behaviour of bulk material can deviate between simulations and reality. Therefore, a defined approach for developing material models is required in order to improve the accuracy of numeric simulations. This need is intensified, as recycling processes with direct processing of regrind with complex particle shapes become more common. In this paper, an approach commonly referred to as calibration is applied to several polymer pellets as well as regrind. The approach is altered in order to produce accurate models suited to replicate the conditions (flow conditions, pressure and relative movement) occurring during polymer processing in screw machines. A method for material model development is defined, focusing on calibrating the coefficient of rolling friction based on an angle of repose test and subsequently assessing the representation of the coefficients of friction in a shear cell and bulk density in annular-recess-shaped containers. The developed single- and multi-sphere models can be used for further investigations on the behaviour of polymer processing screw machines.</div></div>","PeriodicalId":7232,"journal":{"name":"Advanced Powder Technology","volume":"36 8","pages":"Article 104968"},"PeriodicalIF":4.2,"publicationDate":"2025-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144306374","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":"Enhancing electric virtual impactor performance with condensational growth and efficient charging for size-selective sampling of fine and ultrafine particles","authors":"Muhammad Zeeshan Zahir ,&nbsp;Kareem Akhtar ,&nbsp;Se-Jin Yook","doi":"10.1016/j.apt.2025.104972","DOIUrl":"10.1016/j.apt.2025.104972","url":null,"abstract":"<div><div>An electric virtual impactor can be used for size-selective sampling of airborne particles by utilizing an electric field to segregate particles based on their size, enabling only particles of a specific size range to be collected. This study utilized a condensational particle growth system to improve the aerosol particle charging efficiency and electric virtual impactor performance. A condensational particle growth system and a corona-needle unipolar charger were used together. Polydisperse particles ranging from 10 nm to 5 μm were grown to bigger droplets and charged to a high charge level in the corona needle charger before drying them in the evaporator. A charge level of more than 50 charges per particle was achieved for sizes of 20, 30, 42, and 55 nm. The highly charged particles were then sampled in the electric virtual impactor. The lower cutoff size of the electric virtual impactor could vary in the range from 30 nm to 1 μm while the upper cutoff size was fixed to 2.5 μm based on inertial separation mechanism. The developed system is expected to be very useful in sampling fine and ultrafine particles under normal pressure conditions, even by setting the particle size range suitable for the sampling purpose.</div></div>","PeriodicalId":7232,"journal":{"name":"Advanced Powder Technology","volume":"36 8","pages":"Article 104972"},"PeriodicalIF":4.2,"publicationDate":"2025-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144306375","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":"Effects of nano-CaCO3 on microstructure and magnetic properties of soft magnetic composites (SMCs) containing FeSiCr and amorphous FeSiBCr powders","authors":"Yangyang Su ,&nbsp;Liang Qiao ,&nbsp;Jingwu Zheng ,&nbsp;Yao Ying ,&nbsp;Wei Cai ,&nbsp;Juan Li ,&nbsp;Jing Yu ,&nbsp;Wangchang Li ,&nbsp;Shenglei Che","doi":"10.1016/j.apt.2025.104970","DOIUrl":"10.1016/j.apt.2025.104970","url":null,"abstract":"<div><div>In this study, soft magnetic composites (SMCs) containing crystalline FeSiCr and amorphous FeSiBCr powders were prepared using nano-CaCO₃/epoxy resin as an insulating layer at the low molding pressure. The microstructure and magnetic properties of the composites were investigated by SEM and meassuring resistivity, permeability, and magnetic core loss. The results show that the nano-CaCO₃ addition with 1–5 wt% contents benefits dispersing the composite magnetic powders more effectively and improving the density and permeability. The magnetic core loss initially increases and subsequently decreases again with the increase of nano-CaCO₃. By loss separation, it is found that the hysteresis loss and residual loss are the predominant, while the eddy current loss is relatively small in the frequency range of 200–1000 kHz. Based on the results, the influencing mechanism of nano-CaCO₃ on the microstructure and magnetic properties was discussed.</div></div>","PeriodicalId":7232,"journal":{"name":"Advanced Powder Technology","volume":"36 8","pages":"Article 104970"},"PeriodicalIF":4.2,"publicationDate":"2025-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144280200","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":"Construction of novel double S-scheme TiO2-x/BiOCl/BiCl3Br-CTA nanocomposites with quantum dot size for the photocatalytic degradation of pollutants","authors":"Arezou Saadati ,&nbsp;Aziz Habibi-Yangjeh ,&nbsp;Alireza Khataee","doi":"10.1016/j.apt.2025.104961","DOIUrl":"10.1016/j.apt.2025.104961","url":null,"abstract":"<div><div>In this study, TiO_2-x/BiOCl/BiCl₃Br-CTA (T_OVBBOC) nanocomposites, in which CTA denotes cetyltrimethylammonium cation, were fabricated through a facile hydrothermal method. The nanocomposites were investigated for photocatalytic degradation of azithromycin (Azi), tetracycline (TC), methyl orange (MO), fuchsine (FS), and rhodamine B (RhB) upon visible light. The photocatalytic efficiencies of T_OVBBOC-2 were 37.2, 15.3, 20.2, 13.8, and 5.59 times higher than TiO_2-x (T_OV) and 18.1, 22.1, 16.6, 20.3, and 14.2 folds larger than BiOCl/BiCl₃Br-CTA for the degradations of Azi, TC, MO, FS, and RhB, respectively. Furthermore, the cycling tests confirmed that the T_OVBBOC-2 nanocomposite displayed a high photostability. The significant photocatalytic performance of T_OVBBOC-2 heterojunction was mainly attributed to the increased visible-light absorption and a lower recombination rate of photogenerated charges. A photo-removal mechanism on the T_OVBBOC-2 photocatalyst was also proposed based on band position and radical trapping tests. Importantly, the biocompatibility of the TC solution after treating over the T_OVBBOC-2 nanocomposite was studied via the growth of wheat seeds. The current research offered a promising route for fabricating an effective visible-light-driven material for environmental remediation.</div></div>","PeriodicalId":7232,"journal":{"name":"Advanced Powder Technology","volume":"36 8","pages":"Article 104961"},"PeriodicalIF":4.2,"publicationDate":"2025-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144289190","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":"Comparative analysis of microstructure and combustion performance of flake and spherical aluminum powder and its application in chip self-destruction","authors":"Hongyang Li ,&nbsp;Ran Wang ,&nbsp;Ningliang Kong ,&nbsp;Shentao Zeng ,&nbsp;Lixiaosong Du ,&nbsp;Hong Li ,&nbsp;Wenqi Xu ,&nbsp;Ruiling Xie ,&nbsp;Cui Luo ,&nbsp;Jianmin Wu ,&nbsp;Ying Liu","doi":"10.1016/j.apt.2025.104964","DOIUrl":"10.1016/j.apt.2025.104964","url":null,"abstract":"<div><div>The combustion performance of aluminum powder is closely related to its microstructural features, which significantly influence the engineering applicability of aluminum powder as metal fuel. In this study, six types of flake aluminum powders and six types of spherical aluminum powders were selected for a comparative investigation of their microstructural characteristics and combustion performance, employing techniques of Scanning Electron Microscopy (SEM), Energy Dispersive Spectroscopy (EDS), X-ray Diffraction (XRD), and oxygen bomb calorimetry. Additionally, research was conducted on the chip self-destruction technology based on aluminum powder. The results indicate that as the particle size of flake aluminum powder increases, the content of reactive aluminum also rises, leading to enhanced combustion heat value. Smaller-sized flake aluminum powders exhibited agglomeration phenomena. The condensed combustion products of flake aluminum powder are composed of dispersed gray-white particles, with multiple smaller fragments present. The smaller the particle size of the flake aluminum powder, the more dispersed its combustion products appear upon solidification; conversely, larger particles tend to coalesce. The primary composition of the combustion products of flake aluminum powders consists of 3Al₂O₃·2SiO₂ and Al₂O₃ crystals. For spherical aluminum powders, both the combustion heat value and efficiency increase with larger particle size, with notable differences observed between nano-sized and micron-sized aluminum powders regarding combustion heat value and efficiency. The combustion products of spherical aluminum powders consist of closely adhered black and white condensed phase combustion products, along with a few gray-white particles distributed on the walls and bottom of the crucible. The ignition process of both flake and spherical aluminum powder composite fuels comprises five stages: ignition, deflagration, stable combustion, flame decay, and extinguishing, with significant effects of the microstructural differences in aluminum powders on each stage. The ignition delay time for flake aluminum powders is shorter than that for spherical aluminum powders, accompanied by a higher intensity of combustion, indicating greater flammability, while spherical aluminum powders exhibit longer combustion durations. Both flake aluminum powder composite fuels and spherical aluminum powder composite fuels can cause irreversible physical damage to chips and their leads, achieving effective destruction.</div></div>","PeriodicalId":7232,"journal":{"name":"Advanced Powder Technology","volume":"36 8","pages":"Article 104964"},"PeriodicalIF":4.2,"publicationDate":"2025-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144271497","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":"Full title (Editorial Board Members)","authors":"","doi":"10.1016/S0921-8831(25)00176-1","DOIUrl":"10.1016/S0921-8831(25)00176-1","url":null,"abstract":"","PeriodicalId":7232,"journal":{"name":"Advanced Powder Technology","volume":"36 7","pages":"Article 104955"},"PeriodicalIF":4.2,"publicationDate":"2025-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144253855","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":"Inside Front Cover (Aims & Scope, Editors)","authors":"","doi":"10.1016/S0921-8831(25)00175-X","DOIUrl":"10.1016/S0921-8831(25)00175-X","url":null,"abstract":"","PeriodicalId":7232,"journal":{"name":"Advanced Powder Technology","volume":"36 7","pages":"Article 104954"},"PeriodicalIF":4.2,"publicationDate":"2025-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144253854","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":"Optical characteristics and application of cobalt/nickel doped SrZn2(PO4)2 blue-violet and violet inorganic pigment powders","authors":"Qiuyu Cheng ,&nbsp;Zhiwei Wang ,&nbsp;Ayahisa Okawa ,&nbsp;Takuya Hasegawa ,&nbsp;Tohru Sekino ,&nbsp;Shu Yin","doi":"10.1016/j.apt.2025.104952","DOIUrl":"10.1016/j.apt.2025.104952","url":null,"abstract":"<div><div>Blue-violet and violet inorganic pigments, derived from SrZn_2-<em>_x</em>Co<em>_x</em>(PO₄)₂ (0 ≤ <em>x</em> ≤ 1) and SrZn_2-<em>_x</em>Ni<em>_x</em>(PO₄)₂ (0 ≤ <em>x</em> ≤ 0.5) solid solutions, were successfully synthesized via a solid-state reaction. The structure, color, optical properties, and potential applications of the synthesized pigments were systematically characterized. All pigments crystallized in a single-phase structure. Rietveld refinement analysis confirmed the successful substitution of Zn²⁺ by Co²⁺/Ni²⁺ in the lattice. Based on the XPS and UV–Vis–NIR analyses revealed that the coloration of Co²⁺/Ni²⁺ doped SrZn₂(PO₄)₂ originates from <em>d-d</em> electronic transitions in a tetrahedral coordination environment. Compared to commercial purple pigments, such as Co₃(PO₄)₂ and NH₄MnP₂O₇, the synthesized pigments exhibit superior thermal stability and require lower cobalt or nickel doping levels. Furthermore, 2 wt% of these pigments were incorporated into poly(methyl methacrylate) (PMMA) plastic to form blue-violet and violet composites, whose color and optical properties were systematically analyzed.</div></div>","PeriodicalId":7232,"journal":{"name":"Advanced Powder Technology","volume":"36 8","pages":"Article 104952"},"PeriodicalIF":4.2,"publicationDate":"2025-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144253284","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":"Changes in full characteristics of spontaneous coal combustion under influence of temperature-driven CO2 desorption","authors":"Lin Li ,&nbsp;Tiantian Liu ,&nbsp;Xiangjun Chen ,&nbsp;Jun Liu ,&nbsp;Lin Wang ,&nbsp;Fuchao Tian ,&nbsp;Weiwei Su ,&nbsp;Haidong Chen ,&nbsp;Xuechen Li ,&nbsp;Guodong Li","doi":"10.1016/j.apt.2025.104962","DOIUrl":"10.1016/j.apt.2025.104962","url":null,"abstract":"<div><div>In coal mine goafs, spontaneous coal combustion disaster is a heating process caused by coal oxidation. Many experiments have investigated the variation of coal oxidation characteristics under different inert conditions; however, the time precondition of the inert conditions is usually ignored. In this study, a porous material adsorbed with CO₂ is mixed with coal for the oxidative heating experiment to investigate its full influence on the coal oxidation characteristics. The experimental results show that CO₂ proactively desorbs from the porous material at a small increase in temperature. In the mixture sample, the CO₂ concentration increases sharply to 57080 ppm around 80 ∼ 90 °C, and the crossing point temperature moves to the high-temperature region with a maximum delay of 26.3 %, significantly slowing down the oxidation process of the coal. In addition, the composite decision index of the mixture sample increases by a maximum of 10.91 %, and the spontaneous combustion tendency of the coal changes from “Spontaneous combustion” to “Non-prone to spontaneous combustion”, essentially decreasing the spontaneous coal combustion capacity. The temperature-driven CO₂ desorption from the porous material dilutes the oxygen concentration to hinder the coal-oxygen composite reaction from the very beginning of coal oxidation process, presenting an advanced and efficient preventive effect.</div></div>","PeriodicalId":7232,"journal":{"name":"Advanced Powder Technology","volume":"36 8","pages":"Article 104962"},"PeriodicalIF":4.2,"publicationDate":"2025-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144253285","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}