Powder Technology最新文献_第3页

Investigation of water-soluble ions removal through enhanced heat exchange based on cloud-air-purifying technology

IF 4.5 2区工程技术

Powder Technology Pub Date : 2025-03-19 DOI: 10.1016/j.powtec.2025.120950

Haoyuan Xue, Qing Lv, Yuxiang Liu, Kunyan Fu, Yi Wei, Yumeng Zhang, Bo Wang

{"title":"Investigation of water-soluble ions removal through enhanced heat exchange based on cloud-air-purifying technology","authors":"Haoyuan Xue, Qing Lv, Yuxiang Liu, Kunyan Fu, Yi Wei, Yumeng Zhang, Bo Wang","doi":"10.1016/j.powtec.2025.120950","DOIUrl":"10.1016/j.powtec.2025.120950","url":null,"abstract":"<div><div>Pyrometallurgical processes are often accompanied by substantial particle emissions. These particles are ultra-fine and composed of water-soluble ions, making them challenging to effectively remove with existing dust removal equipment. To address this, this study focused on a pyrometallurgical plant in Northwest China, where particle matter emissions from the Kaldo furnace were monitored and analyzed. Based on particles characteristics, studies were conducted to develop process improvements. Firstly, field monitoring studies revealed that the particles at the Kaldo furnace outlet exhibited a bimodal distribution, with one peak consisting of metal particles around 0.6 μm in size. During the wet treatment, these metal particles are converted into water-soluble ions, leading to the wet electrostatic precipitator's removal efficiency of only 53.80 %. Furthermore, a new technology for fine particles removal was introduced, which called Cloud-Air-Purifying (CAP) technology. In CAP, through the effect of heterogeneous condensation, fine particles grow and were then collected in a supergravity field. Results indicated that CAP technology significantly improved overall particle removal efficiency, reaching 91.77 %. However, the average removal efficiency for water-soluble ions was 79.93 %. Subsequently, to improve the water-soluble ions' removal efficiency, theoretical calculations on nucleation rate and removal efficiency were performed. A strategy for enhancing nucleation by improving heat exchange was then established. After determining the temperature drop, long-term monitoring results showed that the upgraded system significantly improved the removal efficiency of water-soluble ions to 99.39 %. The heat-exchange cooling enhanced CAP technology successfully addressed the challenge of controlling water-soluble ions, providing theoretical support for wet dust removal technologies.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"458 ","pages":"Article 120950"},"PeriodicalIF":4.5,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143686424","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

A breakage model for spherical particles without pre-packing and its validation in an impact crusher 无预包装球形颗粒的破碎模型及其在反击式破碎机中的验证

IF 4.5 2区工程技术

Powder Technology Pub Date : 2025-03-18 DOI: 10.1016/j.powtec.2025.120945

Hui Yuan , Fulei Chen , Likuan Chen, Zihan Liu, Yongzhi Zhao

{"title":"A breakage model for spherical particles without pre-packing and its validation in an impact crusher","authors":"Hui Yuan , Fulei Chen , Likuan Chen, Zihan Liu, Yongzhi Zhao","doi":"10.1016/j.powtec.2025.120945","DOIUrl":"10.1016/j.powtec.2025.120945","url":null,"abstract":"<div><div>The discrete element method (DEM) is a powerful tool for simulating particle breakage, offering valuable insights into the operation of industrial crushers. Although spheres do not fully capture the complexity of real particle shapes, their advantage in computational efficiency makes them highly valuable for breakage simulations involving a large number of particles with a wide size distribution. In this study, an improved breakage model for spherical particles without pre-packing is proposed, designed to offer high computational efficiency while maintaining satisfactory accuracy. In the proposed approach, the parental spherical particle is initially considered a polyhedron, which is then cut into a group of progeny polyhedral particles with a fast-cutting method. These fragments are subsequently replaced by spherical particles with the equivalent mass, achieving the sphere-sphere breakage process without setting the size and location of progeny particles in advance. The proposed model is validated by comparing its simulation of an impact crusher with both actual production (including product size distribution and energy consumption) and the polyhedron-to-polyhedron breakage simulation. The validation results demonstrate that the proposed model achieves significant computational efficiency while maintaining accuracy, making it a reliable tool for simulating particle breakage in practical applications.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"457 ","pages":"Article 120945"},"PeriodicalIF":4.5,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143686389","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

Approximating heterogeneous colloidal transport by n-population filtration models

IF 4.5 2区工程技术

Powder Technology Pub Date : 2025-03-18 DOI: 10.1016/j.powtec.2025.120944

Nastaran Khazali, Thomas Russell, Pavel Bedrikovetsky

{"title":"Approximating heterogeneous colloidal transport by n-population filtration models","authors":"Nastaran Khazali, Thomas Russell, Pavel Bedrikovetsky","doi":"10.1016/j.powtec.2025.120944","DOIUrl":"10.1016/j.powtec.2025.120944","url":null,"abstract":"<div><div>This study evaluates the effectiveness of n-particle filtration models in approximating the behaviour of heterogeneous colloidal suspension flows in porous media. Using a numerical investigation, the study examines binary (<em>n</em> = 2) and ternary (<em>n</em> = 3) particle models to approximate breakthrough curves and retention profiles of systems with varying filtration coefficient distributions. The results show that binary and ternary models can effectively replicate the behaviour of systems with lower heterogeneity, where the ratio of maximum to minimum filtration coefficients remains moderate. However, as heterogeneity increases (higher coefficients of variation), the accuracy of lower-particle models decreases, and more particles are required to maintain model fidelity. The study highlights practical guidelines for model selection, recommending binary models for moderate heterogeneity and ternary models for high heterogeneity. It cautions against oversimplifying highly heterogeneous systems with low-particle models and provides a framework for iterative model refinement based on experimental data. This work offers a robust approach for modelling particle transport and retention in porous media, with applications in aquifer recharge, oil recovery, and environmental engineering.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"458 ","pages":"Article 120944"},"PeriodicalIF":4.5,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143725913","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

CFD-DEM coupled study on the characteristics of entrained air and particles dispersion during the particles flow impacting on a heap surface process

IF 4.5 2区工程技术

Powder Technology Pub Date : 2025-03-17 DOI: 10.1016/j.powtec.2025.120940

Hongfa Sun , Siliang Zhou , Jibo Long , Li Zeng

{"title":"CFD-DEM coupled study on the characteristics of entrained air and particles dispersion during the particles flow impacting on a heap surface process","authors":"Hongfa Sun , Siliang Zhou , Jibo Long , Li Zeng","doi":"10.1016/j.powtec.2025.120940","DOIUrl":"10.1016/j.powtec.2025.120940","url":null,"abstract":"<div><div>The process of loading and unloading bulk materials is common in industrial production. This process has become a major source of dust fugitive in industrial plants. In order to understand its dust production mechanism, this paper establishes a physical model of particles flow impacting on the material heap. The CFD-DEM coupling method is validated using experimental data. The effects of heap angle, particle velocity, and hopper outlet diameter on the characteristics of entrained airflow and particle motion are analyzed. The index of ‘entrained flux’ is proposed to assess the influence range of entrained air at the material heap tail. The results indicate that the entrained air velocity exhibits a Gaussian distribution along the normal direction of the material heap surface, with significant fluctuations at the upper part of the material heap and the formation of vortex motion at the material heap tail. The magnitude of the entrained flux is primarily influenced by the location of the vortex, which gradually moves away from the material heap as particle velocity and hopper outlet diameter increase. Conversely, as the heap angle increases, the vortex movement tends to approach the material heap. An objective weighting method is used to analyze the influence weights of the entrained flux, revealing that particle velocity has the highest weight of 39 %, while the hopper outlet diameter has the lowest weight of 26 %.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"457 ","pages":"Article 120940"},"PeriodicalIF":4.5,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143686958","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 investigation on settling process of bi-disperse cohesive particle clouds 双分散凝聚粒子云沉降过程的数值研究

IF 4.5 2区工程技术

Powder Technology Pub Date : 2025-03-17 DOI: 10.1016/j.powtec.2025.120912

Jianxin Hu , Jingjing Xu , Jiafeng Xie , Dingyi Pan

{"title":"Numerical investigation on settling process of bi-disperse cohesive particle clouds","authors":"Jianxin Hu , Jingjing Xu , Jiafeng Xie , Dingyi Pan","doi":"10.1016/j.powtec.2025.120912","DOIUrl":"10.1016/j.powtec.2025.120912","url":null,"abstract":"<div><div>Cohesive forces lead to widespread particle flocculation, significantly altering the settling dynamics of particle clouds. The microscopic dynamics of cloud settling require further investigation, especially considering inter-particle cohesion and poly-dispersity caused by particle density variations in practical engineering applications. Motivated by this, we employ an Eulerian–Lagrangian computational fluid dynamics-discrete element method (CFD–DEM) coupling model to investigate the settling behavior of bi-disperse cohesive particle clouds in a stationary flow field. The results indicate that, for non-cohesive clouds, the large inertia of heavy particles prevents them from following the vortex back into the cloud, resulting in the upward segregation and leakage of heavy particles. The introduction of cohesion reduces the vertical particle segregation at low density ratios and intensifies segregation at high density ratios. This behavior is associated with floc formation and vortex structures. These segregation characteristics provide valuable insights into the directional recovery of heavy metal particles from wastewater. Furthermore, involving cohesion promotes the horizontal dispersion of particles by influencing the vortex structure. It contributes to a better understanding of particle dispersion in aquatic environments and providing guidance for the use of flocculants in engineering applications.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"457 ","pages":"Article 120912"},"PeriodicalIF":4.5,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143686386","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

A fluidised bed particle engineering approach for simultaneous encapsulation and granulation of an API-based ionic liquid 采用流化床颗粒工程方法同时封装和造粒以原料药为基础的离子液体

IF 4.5 2区工程技术

Powder Technology Pub Date : 2025-03-17 DOI: 10.1016/j.powtec.2025.120931

Michael W. Stocker , Anne Marie Healy , Steven Ferguson

{"title":"A fluidised bed particle engineering approach for simultaneous encapsulation and granulation of an API-based ionic liquid","authors":"Michael W. Stocker , Anne Marie Healy , Steven Ferguson","doi":"10.1016/j.powtec.2025.120931","DOIUrl":"10.1016/j.powtec.2025.120931","url":null,"abstract":"<div><div>Solidification of room temperature ionic liquids provides advantages in terms of handling and utilisation in the context of solid dosage forms. Encapsulating drug-based ionic liquids by direct spray operations represents a promising platform for solidifying and formulating these challenging materials. Previous studies have focused on solidification of room temperature active pharmaceutical ingredient (API) ionic liquids (API-ILs) by spray drying. This approach typically results in the production of fine powders that tend to require further processing before they can be incorporated into final solid dosage forms. Fluidised bed granulation is an alternative technology that combines a direct spray operation with a particle size enlargement process. Successfully encapsulating an API-IL using this approach would circumvent suboptimal bulk powder properties of spray dried materials associated with their fine particle size and poor flowability, with the possibility of coating the granular cores with controlled release polymers and blending with additional excipients to yield a highly engineered drug product suitable for direct compression. In the current work a model API-IL was successfully granulated by adapting the spray encapsulation process to operate in a fluidised bed granulator and incorporating an inert filler material in the granulated product. The spray granulated API-IL products from this process were characterised with regard to their particle size, composition, and powder flow properties, and preliminary tabletting studies were performed using the granulates. This is the first demonstrated example of a composite drug product of its kind.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"457 ","pages":"Article 120931"},"PeriodicalIF":4.5,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143686387","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

Experimental and simulation studies on the capture of micro-particles by a single droplet

IF 4.5 2区工程技术

Powder Technology Pub Date : 2025-03-17 DOI: 10.1016/j.powtec.2025.120937

Jun Xie, Lijuan Hou, Qiang Ma, Yanchen Li, Jinlin Bian, Rundong Li

{"title":"Experimental and simulation studies on the capture of micro-particles by a single droplet","authors":"Jun Xie, Lijuan Hou, Qiang Ma, Yanchen Li, Jinlin Bian, Rundong Li","doi":"10.1016/j.powtec.2025.120937","DOIUrl":"10.1016/j.powtec.2025.120937","url":null,"abstract":"<div><div>Coal, as a principal fossil energy source, occupies a crucial role in the global energy landscape. Nevertheless, the fine particles generated during the combustion of coal have exerted severe negative influences on human health, air visibility, and equipment safety. This paper focuses on wet flue gas desulfurization and collaborative dust removal technology as the research context. High-speed photography technology was employed to record the motion behavior of silica (SiO<sub>2</sub>) particles impacting deionized water, thereby the suspension/sinking phase diagram of the particles was obtained, and a fitting relationship between the particle size and the critical sinking velocity was established. The relationship was employed as the boundary condition and integrated with the Discrete Phase Model (DPM) in Computational Fluid Dynamics (CFD), and then the capture efficiency of micron-sized particles depositing onto the surface of liquid droplets was studied quantitatively. Moreover, the deposition distribution was explored by developing User Defined Functions (UDF). Finally, the influence of parameters such as particle sphericity, droplet diameter, airflow velocity, temperature difference, and droplet deformation rate on the capture efficiency, deposition distribution, and capture mechanism was elucidated, thereby providing theoretical support for the efficient removal of fine particles.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"457 ","pages":"Article 120937"},"PeriodicalIF":4.5,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143686388","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

High-performance spherical W-Cu composite powders for additive manufacturing via spray granulation and cold isostatic pressure sintering

IF 4.5 2区工程技术

Powder Technology Pub Date : 2025-03-16 DOI: 10.1016/j.powtec.2025.120935

Jie Mao , Nan Ye , Zichun Wu , Ziyi Gong , Haiou Zhuo , Wentan Zhu , Jiancheng Tang

{"title":"High-performance spherical W-Cu composite powders for additive manufacturing via spray granulation and cold isostatic pressure sintering","authors":"Jie Mao , Nan Ye , Zichun Wu , Ziyi Gong , Haiou Zhuo , Wentan Zhu , Jiancheng Tang","doi":"10.1016/j.powtec.2025.120935","DOIUrl":"10.1016/j.powtec.2025.120935","url":null,"abstract":"<div><div>Developing spherical W-Cu composite powders offers a promising solution for achieving additive manufacturing to prepare W-Cu composites with finer microstructures and superior properties. However, the melting point difference and poor wettability of W and Cu hinder traditional powder preparation methods. Spray drying with sintering densification provides an efficient, cost-effective, and eco-friendly approach to producing dense spherical powders for additive manufacturing. This study developed spherical W-Cu composite powders for additive manufacturing using WO<sub>3</sub> and CuO as raw materials. Initially, a spherical W-Cu precursor powder was synthesized from WO<sub>3</sub> and CuO via spray-drying granulation. The precursor powder was then subjected to a three-stage reduction procedure. Finally, high-performance powders were produced via cold isostatic pressing and high-temperature sintering with ultrafine WO<sub>3</sub> as the sintering barrier. The resulting powders exhibited high sphericity, good dispersion, high densification, and fine-grained microstructures with uniform elemental distribution, as well as excellent fluidity (11.6 s/50 g), high loose apparent density (7.65 g/cm<sup>3</sup>), and low oxygen content (225 ppm), rendering them ideal for additive manufacturing. Laser-directed energy deposition (L-DED)-fabricated parts exhibited outstanding properties, including high densification (relative density 96.2 %), excellent tensile strength (512.57 MPa), hardness (260.6 HV<sub>0.5</sub>), electrical conductivity (37.93 % IACS), and thermal conductivity (215.35 W/mK), comparable to the W-Cu parts produced using conventional processes. The proposed method offers a promising approach for the development of advanced materials tailored to AM technologies.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"457 ","pages":"Article 120935"},"PeriodicalIF":4.5,"publicationDate":"2025-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143687460","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

Measurement of the particle density of small amounts of pharmaceutical powders using high-contrast micro X-ray computed tomography

IF 4.5 2区工程技术

Powder Technology Pub Date : 2025-03-15 DOI: 10.1016/j.powtec.2025.120929

Tamaki Miyazaki , Yoshihiro Takeda , Daisuke Ando , Tatsuo Koide , Yoji Sato , Eiichi Yamamoto

{"title":"Measurement of the particle density of small amounts of pharmaceutical powders using high-contrast micro X-ray computed tomography","authors":"Tamaki Miyazaki , Yoshihiro Takeda , Daisuke Ando , Tatsuo Koide , Yoji Sato , Eiichi Yamamoto","doi":"10.1016/j.powtec.2025.120929","DOIUrl":"10.1016/j.powtec.2025.120929","url":null,"abstract":"<div><div>Particle density is a fundamental and important physical property of powders. However, the widely used gas displacement pycnometry (GDP) method typically requires sample volumes in the gram range. In this study, we developed a method for evaluating the density of milligram-scale samples using X-ray computed tomography (XRCT). We used pharmaceutical powders, consisting of organic and light metallic elements, as subjects. The volumes of 24 pharmaceutical powders (2–160 mg) with various particle sizes and shapes were measured using an XRCT device with a resolution of 0.65–2.6 μm (field of view: 1.33–5.32 mm). Copper and molybdenum targets were used as X-ray sources, providing high-contrast imaging for materials with low electron densities. The densities obtained using XRCT correlated well with those obtained using GDP, as indicated by a linear regression line with a slope of 1.0 passing through the origin. The coefficient of variation for six sequential measurements was 0.0070, suggesting high repeatability. Additionally, we investigated optimal experimental conditions, such as spatial resolution, X-ray sources, and measurement time, to enhance the quality of three-dimensional XRCT images. We found that images with a grayscale histogram peak separation of approximately one between the sample and other components (sample tube and air) yielded optimal results. This non-destructive technique has the potential to accurately measure the densities of small sample quantities and can contribute not only to the pharmaceutical field but also to other industries handling organic and light metallic powders.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"457 ","pages":"Article 120929"},"PeriodicalIF":4.5,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143687410","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

Study on sintering density and microstructure of metal injection molding of TiAl alloy using a new blend powder combination

IF 4.5 2区工程技术

Powder Technology Pub Date : 2025-03-15 DOI: 10.1016/j.powtec.2025.120936

Ce Zhang , Hanlin Wang , Rui Liu , Jiazhen Zhang , Xin Lu

引用次数: 0