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1. Some observations on the influence of particle size and size distribution on stratification in pneumatic jigs

Author:
Ambrós, Weslei M.; Sampaio, Carlos H.; Cazacliu, Bogdan G.; Conceição, Paulo N.; dos Reis, Glaydson S.
Source:
Powder technology 2019 v.342 pp. 594-606
ISSN:
0032-5910
Subject:
particle size; particle size distribution,   etc   ; powders;     Show all 3 Subject
Abstract:
... Particle size variation plays a key role in jigging performance, and despite extensive research in the area, very little attention has been given in the case of pneumatic jigging. The aim of this study was to look into particle stratification in a pilot-scale pneumatic jig when varying the particle size and the range of the particle size distribution in ternary mixtures of aggregates. Jigging test ...
DOI:
10.1016/j.powtec.2018.10.029

2. Understanding the varying discharge rates of lognormal particle size distributions from a hopper using the Discrete Element Method

Author:
Zhao, Ya; Yang, Shiliang; Zhang, Liangqi; Chew, Jia Wei
Source:
Powder technology 2019 v.342 pp. 356-370
ISSN:
0032-5910
Subject:
particle size; particle size distribution,   etc   ; powders;     Show all 3 Subject
Abstract:
... The focus of this study is on understanding the varying discharge rates of lognormal particle size distributions (PSDs) with the same mean particle diameter. Discrete element method (DEM) is used to simulate lognormal PSDs with the same arithmetic mean of the particle diameter of 5 mm but varying PSD widths (σ/μ = 10% to 70%) in a 3D conical hopper. Four highlights are noted: (i) the Beverloo corr ...
DOI:
10.1016/j.powtec.2018.09.080

3. Particle size ratio and distribution effects on packing behaviour of crushed GMZ bentonite pellets

Author:
Liu, Zhang-Rong; Ye, Wei-Min; Zhang, Zhao; Wang, Qiong; Chen, Yong-Gui; Cui, Yu-Jun
Source:
Powder technology 2019 v.351 pp. 92-101
ISSN:
0032-5910
Subject:
particle size; particle size distribution,   etc   ; bentonite; pellets; powders; radioactive waste;     Show all 6 Subjects
Abstract:
... High-density bentonite pellets have been considered as an alternative sealing or buffer material for nuclear waste repository. Investigation on the packing behaviour of pellets is of great interest due to the significant impacts of global density on the hydro-mechanical behaviors of the material. In this manuscript, the packing behaviour of mono-size, binary-size, ternary-size and multi-size mixtu ...
DOI:
10.1016/j.powtec.2019.03.038

4. Reducing comminution over-grinding of powder coatings with modified grinding pins in an air classifier mill

Author:
Li, Weihong; Shao, Yuanyuan; Zhu, Jingxu; Zhang, Haiping; Zhang, Hui
Source:
Powder technology 2019 v.344 pp. 36-45
ISSN:
0032-5910
Subject:
particle size; particle size distribution,   etc   ; air; coatings; energy; grinding; powders;     Show all 7 Subjects
Abstract:
... Air classifier mill (ACM) is widely used in powder coating and mineral comminution process. One of the problems typically presenting in ACM is over-grinding, which leads to high energy consumption and broad particle size distribution (PSD). To decrease the excessive amount of fine particles in the products, 6 configurations of grinding pins with ditches in the impact surface were used in the exper ...
DOI:
10.1016/j.powtec.2018.11.076

5. MLA-based sphalerite flotation optimization: Two-stage roughing

Author:
Zhang, Peng-yu; Ou, Le-ming; Zeng, Ling-ming; Zhou, Wei-guang; Fu, Hai-tao
Source:
Powder technology 2019 v.343 pp. 586-594
ISSN:
0032-5910
Subject:
particle size; particle size distribution,   etc   ; minerals; powders; zinc;     Show all 5 Subjects
Abstract:
... In this paper, an optimized flotation approach, two-stage roughing process, was introduced for improving sphalerite performance based on its mineral liberation characteristics. Mineral Liberation Analysis (MLA), lab-scale and plant-scale flotation tests, and particle size analysis were used to obtain the properties of sphalerite liberation and the particle size distribution. Experimental results s ...
DOI:
10.1016/j.powtec.2018.11.085

6. Combined effect of chemical and turbulent agglomeration on improving the removal of fine particles by different coupling mode

Author:
Sun, Zongkang; Yang, Linjun; Shen, Ao; Zhou, Lei; Wu, Hao
Source:
Powder technology 2019 v.344 pp. 242-250
ISSN:
0032-5910
Subject:
particle size,   etc   ; droplets; powders; probability;     Show all 4 Subjects
Abstract:
... Both the chemical and turbulent agglomeration are promising pretreatment technologies for promoting the removal of fine particles. However, single chemical and turbulent agglomeration both have some shortcomings in improving the agglomeration of fine particles. Based on the combination of chemical and turbulent agglomeration, different coupling modes of chemical and turbulent agglomeration were pr ...
DOI:
10.1016/j.powtec.2018.12.032

7. A novel strategy to purify conductive polymer particles

Author:
Spence, Daron; Polizos, Georgios; Joshi, Pooran; Sharma, Jaswinder
Source:
RSC advances 2019 v.9 no.9 pp. 4857-4861
ISSN:
2046-2069
Subject:
particle size,   etc   ; polymers; surfactants; washing;     Show all 4 Subjects
Abstract:
... The purification of conductive polymer (e.g., polyaniline) particles is a challenging task, especially when the particle size is small. Herein, we demonstrate a unique strategy (electrode-based) to purify polyaniline particles by exploiting the difference in surface charge between particles and surfactants, and compare the results with a commonly used purification strategy (washing). ...
DOI:
10.1039/c8ra08372j

8. Detecting stability of conical spouted beds based on information entropy theory

Author:
Savari, Chiya; Sotudeh-Gharebagh, Rahmat; Kulah, Gorkem; Koksal, Murat; Mostoufi, Navid
Source:
Powder technology 2019 v.343 pp. 185-193
ISSN:
0032-5910
Subject:
particle size,   etc   ; entropy; powders; prediction;     Show all 4 Subjects
Abstract:
... Effects of particle size, particle density, gas inlet diameter and static bed height on the stability of operation in conical spouted beds were investigated through analyses of information entropy of pressure fluctuations. In this respect, the maximum information entropy of pressure fluctuations was used as a stability criterion. The results showed that stability of the bed increases with an incre ...
DOI:
10.1016/j.powtec.2018.11.028

9. Particle scale modelling of mixing of ellipsoids and spheres in gas-fluidized beds by a modified drag correlation

Author:
Abbaszadeh Molaei, E.; Yu, A.B.; Zhou, Z.Y.
Source:
Powder technology 2019 v.343 pp. 619-628
ISSN:
0032-5910
Subject:
particle size,   etc   ; mixing; models; powders;     Show all 4 Subjects
Abstract:
... Shape is one of the most important properties of particles, and can affect particle flow behavior significantly in particulate systems. In the past, extensive studies have been conducted on the effect of particle size and density on the mixing quality of particle mixtures in gas-fluidized beds, but little is known regarding the influence of particle shape. In this work, CFD-DEM approach is used to ...
DOI:
10.1016/j.powtec.2018.11.054

10. Controlled Deposition of Nanosize and Microsize Particles by Spin-Casting

Author:
Danglad-Flores, José; Eftekhari, Karaneh; Skirtach, Andre G.; Riegler, Hans
Source:
Langmuir 2019 v.35 no.9 pp. 3404-3412
ISSN:
1520-5827
Subject:
particle size,   etc   ; dispersions; liquids; polymers;     Show all 4 Subjects
Abstract:
... The deposition of nanosize and microsize spherical particles on planar solid substrates by hydrodynamic-evaporative spin-casting is studied. The particles are dispersed in a volatile liquid, which evaporates during the process, and the particles are finally deposited on the substrate. Their coverage, Γ, depends on the processing parameters (concentration by weight, particles size, etc.). The behav ...
DOI:
10.1021/acs.langmuir.8b03311

11. Fundamentals of Differential Particle Inertial Focusing in Symmetric Sinusoidal Microchannels

Author:
Zhang, Jun; Yuan, Dan; Zhao, Qianbin; Teo, Adrian J. T.; Yan, Sheng; Ooi, Chin Hong; Li, Weihua; Nguyen, Nam-Trung
Source:
Analytical chemistry 2019 v.91 no.6 pp. 4077-4084
ISSN:
1520-6882
Subject:
particle size,   etc   ; geometry; guidelines; viscosity;     Show all 4 Subjects
Abstract:
... Focusing and separation of particles such as cells at high throughput is extremely attractive for biomedical applications. Particle manipulation based on inertial effects requires a high flow speed and thus is well-suited to high-throughput applications. Recently, inertial focusing and separation using curvilinear microchannels has been attracting a great amount of interest because of the linear s ...
DOI:
10.1021/acs.analchem.8b05712

12. Revealing the Formation Mechanism of Alloyed Pd–Ru Nanoparticles: A Conversion Measurement Approach Utilizing a Microflow Reactor

Author:
Asano, Shusaku; Maki, Taisuke; Sebastian, Victor; Jensen, Klavs F.; Mae, Kazuhiro
Source:
Langmuir 2019 v.35 no.6 pp. 2236-2243
ISSN:
1520-5827
Subject:
particle size,   etc   ; nanoparticles; polyols; ruthenium;     Show all 4 Subjects
Abstract:
... The synthesis of alloyed nanoparticles has been studied extensively; however, the formation mechanisms involved remain unclear. Here, we reveal the detailed formation mechanism of alloyed nanoparticles in a Pd–Ru system, using a semibatch polyol method in which the simultaneous rapid reduction of both precursors was assumed to be the critical mechanism. We employed a microflow reactor to realize r ...
DOI:
10.1021/acs.langmuir.8b03516

13. Experimental investigation of fine-grained settling slurry flow behaviour in inclined pipe sections

Author:
Vlasák, Pavel; Chára, Zdeněk; Matoušek, Václav; Konfršt, Jiří; Kesely, Mikoláš
Source:
Vodohospodársky časopis 2019 v.67 no.2 pp. 113-120
ISSN:
0042-790X
Subject:
particle size distribution,   etc   ; freight; glass; pipelines; slurries;     Show all 5 Subjects
Abstract:
... For the safe and economical design and operation of freight pipelines it is necessary to know slurry flow behaviour in inclined pipe sections, which often form significant part of pipelines transporting solids. Fine-grained settling slurry was investigated on an experimental pipe loop of inner diameter D = 100 mm with the horizontal and inclined pipe sections for pipe slopes ranging from −45° to + ...
DOI:
10.2478/johh-2018-0039

14. CFD and DEM modelling of particles plugging in shale pores

Author:
Yang, Xianyu; Chen, Shuya; Shi, Yanping; Feng, Ruimin; Cai, Jihua; Jiang, Guosheng
Source:
Energy 2019 v.174 pp. 1026-1038
ISSN:
0360-5442
Subject:
particle size,   etc   ; gravity; models; nanoparticles; roughness; shale;     Show all 6 Subjects
Abstract:
... Nanoparticles plugging effect has recently been recognized in shale cores. However, the motional discipline and plugging efficiency of different nanoparticles in shale pores have not been well recognized. In this paper, an approach with CFD and DEM to model particulate suspension flows is presented in the micro scale for shale pores. The particle trajectory and the plugging efficiency can be obtai ...
DOI:
10.1016/j.energy.2019.03.050

15. Comparison of numerical solution strategies for population balance model of continuous cone mill

Author:
Bhonsale, Satyajeet S.; Telen, Dries; Stokbroekx, Bard; Van Impe, Jan
Source:
Powder technology 2019 v.345 pp. 739-749
ISSN:
0032-5910
Subject:
particle size,   etc   ; crystallization; equations; fineness; models; powders;     Show all 6 Subjects
Abstract:
... Population balance models are routinely used for modeling particulate processes involving breakage, agglomeration, crystallisation, etc. In this study, a comparison between three different numerical solution strategies for breakage population balance models is presented. Results are obtained for the fixed pivot technique, moving pivot technique and the cell average technique. These techniques are ...
DOI:
10.1016/j.powtec.2019.01.043

16. Assessment of forces acting on fine particles on a traveling-wave electric field conveyor: Application to powder manipulation

Author:
Zouaghi, Ayyoub; Zouzou, Noureddine; Dascalescu, Lucien
Source:
Powder technology 2019 v.343 pp. 375-382
ISSN:
0032-5910
Subject:
particle size,   etc   ; adhesion; electric field; polymethylmethacrylate; powders;     Show all 5 Subjects
Abstract:
... The purpose of this work is to investigate the transport mechanism of fine dielectric particles using a traveling-wave electric field conveyor. In the first part of this study, an experimental bench is set up to evaluate the efficiency of particle displacement according to their size and to visualize their motion. The displacement efficiency is evaluated based on the ratio of the mass of transport ...
DOI:
10.1016/j.powtec.2018.11.065

17. Sealing pipe top enhancing transportation of particulate solids inside a vertically vibrating pipe

Author:
Zhang, Fuweng; Cronin, Kevin; Lin, Yinhe; Miao, Song; Liu, Chuanping; Wang, Li
Source:
Powder technology 2019 v.343 pp. 383-391
ISSN:
0032-5910
Subject:
particle size,   etc   ; atmospheric pressure; gravity; powders; vibration;     Show all 5 Subjects
Abstract:
... Particles can move against gravity inside a vibrating tube inserted in a static granular bed. This offers a new approach for transporting bulk material. In this work, we demonstrate a method to enhance the conveying of powder by sealing the tube top. With the same vibration conditions, a comparison of particle motion in an opened tube and closed top (sealed) pipe is made. Compared to an un-sealed ...
DOI:
10.1016/j.powtec.2018.11.069

18. Synthesis of multicore energetic hollow microspheres with an improved suspension polymerization-thermal expansion method

Author:
Liu, Wen-jin; Cheng, Yang-fan; Meng, Xiang-rui; Ma, Hong-hao; Shu, Chi-min; Fang, Hua; Song, Shi-xiang; Shen, Zhao-wu
Source:
Powder technology 2019 v.343 pp. 326-329
ISSN:
0032-5910
Subject:
particle size,   etc   ; additives; emulsions; energy; microparticles; powders;     Show all 6 Subjects
Abstract:
... A novel energetic microsphere with multicore hollow structure and uniform particle size is prepared by an improved suspension polymerization-thermal expansion method with methyl methacrylate, azodicarbonamide (AC) and TiH2 powder as monomer, blowing agent and core material, respectively. The energetic hollow microspheres (EHMs) can play double roles as sensitizers and energetic additives in emulsi ...
DOI:
10.1016/j.powtec.2018.11.071

19. Investigation of the fluidization of LiF-barite binary mixtures

Author:
Zhang, Pingyu; Xia, Wei; Yang, Xiushan; Yang, Lin; Zhang, Zhiye; Zhong, Yanjun; Han, Xiaojie; Kong, Xingjian
Source:
Powder technology 2019 v.342 pp. 267-274
ISSN:
0032-5910
Subject:
particle size,   etc   ; barite; lubrication; models; powders;     Show all 5 Subjects
Abstract:
... This investigation focused on the effect of the operating parameters, barite content and particle size on the minimum fluidization velocity and particle agglomerate sizes of select LiF-barite binary mixtures. Experimental results showed that the relative fluidization in the bed of a binary mixture was better than the fluidization of a single component LiF bed. Results also identified two distinct ...
DOI:
10.1016/j.powtec.2018.09.060

20. Features of Transformation of Humic Substances in Soddy-Podzolic Soil Disturbed by Main Pipeline Construction

Author:
Ovchinnikova, M. F.
Source:
Moscow University soil science bulletin 2019 v.74 no.1 pp. 33-39
ISSN:
0147-6874
Subject:
particle size,   etc   ; humic substances; humus; soil;     Show all 4 Subjects
Abstract:
... The effect and aftereffect of main pipeline construction on the characteristics of humus and features of its distribution over the particle-size fractions of soddy-podzolic soil are studied. The features of technogenic degradation of humus and the degree of their manifestation compared to the control soil in different observation periods are characterized with respect to the specifics of the ecolo ...
DOI:
10.3103/S0147687419010095