Particle size analysis on wide size distribution powders; effect of sampling and characterization technique

Basim, G. Bahar; Khalili, Mohsen

doi:10.1016/j.apt.2014.09.009

Cited by 33 publications

(11 citation statements)

References 18 publications

(23 reference statements)

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“…The importance of particle size and shape in cake filtration is widely recognized in the literature. Small particles are known to cause high resistance to filtration (Wakeman, 2007), which increases the cost of separation and drying (Basim and Khalili, 2015), and some non-spherical particle shapes have been reported to increase the compressibility and porosity of the filter cake (Bourcier et al, 2016). Among the most common statistical particle sizes used to describe the particle size of solids are the surface area -based Sauter mean diameter D [3,2], the median diameter D50, and the volumetric mean diameter D [4,3] (Allen, 2003).…”

Section: Introductionmentioning

confidence: 99%

Reduction of the width of particle size distribution to improve pressure filtration properties of slurries

Kinnarinen

Tuunila

Häkkinen

2017

Minerals Engineering

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The filtration properties of mineral slurries depend for instance on the properties of the solid particles and on the way how these particles arrange themselves when the filter cake is formed. In cake filtration applications, the focus is often on particle size instead of the shape of particle size distribution (PSD). The aim of this experimental study is to demonstrate the influence of the width of PSD on the properties of the filter cake in the pressure filtration of Ni-Cu mine tailings. Modification of PSD is performed by using a stirred media mill at various operational conditions. The results show that not only particle size should be considered when the filtration properties are evaluated: a significant reduction of the average specific cake resistance (> 60 %) and increase of the average porosity (almost 30 %) can be achieved by stirred media grinding at optimal conditions, in spite of reducing the median particle size. On the other hand, the selection of unfavorable grinding conditions may cause substantial increase in cake resistance. Above all, the results imply that the size of particles in the coarse end of PSD should be reduced while avoiding grinding of the finest particles. This seems to be obtainable by paying special attention to the size of the grinding medium. The main outcomes of this study will help in reducing the energy consumption of dewatering of tailings to be disposed of, and recovering valuable elements from tailings deposited in ponds, requiring the use of optimized grinding circuits and solid-liquid separation operations. However, the benefits obtained in the filtration stage should overcome the increased costs caused by the installation and energy consumption of the grinding systems. This means that the demonstrated grinding method may be profitably utilized in industrial scale only when the material is easy to grind and the filtration properties can be significantly improved, or when the filtration plant is the main bottleneck of the process.

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Section: Introductionmentioning

confidence: 99%

Reduction of the width of particle size distribution to improve pressure filtration properties of slurries

Kinnarinen

Tuunila

Häkkinen

2017

Minerals Engineering

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“…This was done as particle size measurement is dependent on the exact way that it is measured [3]. The number of sieves used was restricted to two, to minimize agglomerate breakdown during measurement.…”

Section: Sievingmentioning

confidence: 99%

The significance of powder breakdown during conveying within industrial milk powder plants

Boiarkina

Sang

Depree

et al. 2016

Advanced Powder Technology

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Instant whole milk powder is designed to rapidly dissolve in water, which depends on the particle size distribution (PSD). The fragile powder exiting the dryer is conveyed for packing which breaks down the particles, worsening the dissolution properties. This work investigated the effect of conveying on the final functional properties using two industrial plants with differing transport systems; a pneumatic system and bucket elevator. It was expected that the plant with the bucket elevator consistently produced powder with superior dissolution due to lower breakdown during transport. This was evaluated using the change in PSD. It was found that the plant with the bucket elevator had at least as large a change in the median particle size as the plant with the pneumatic transport system, contrary to the expectation. However, the plant with the bucket elevator had an initially larger particle size, and so the percentage of fine particles that negatively impact dissolution, remained low post transport. When quantified using the change in bulk density, having an initially low bulk density compensated for large increases in bulk density during conveying and powder with lower bulk density pre-transport showed better wettability post transport. Thus in order to produce powder with the desired functionalities the focus should be on improving the initial agglomeration and generating larger particles and lower bulk density pre-transport, as opposed to optimizing the powder transport.

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“…Scholars at home and abroad for glass powder, fly ash, slag and other auxiliary cementitious materials research shows that the PSD of cementitious materials has a significant impact on the degree of hydration and the development of mechanical properties of cemented specimens. The influence of the particle number of different particle size groups on the early and late mechanical properties of cemented specimens is different [ 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 ]. Liu et al [ 22 ] results show that when mechanically ground waste glass is used as an auxiliary cementitious material, 0–0.3 μm and 3–10 μm particles have significant effects on the early and late mechanical properties of cemented specimens, respectively.…”

Section: Introductionmentioning

confidence: 99%

Influence of Mechanical Grinding on Particle Characteristics of Coal Gasification Slag

et al. 2022

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Based on the test results of laser particle size analyzer, specific surface area analyzer and infrared spectrometer, the grinding kinetics of coal gasification slag (CGS) was systematically described by using Divas–Aliavden grinding kinetics, Rosin–Rammler–Bennet (RRB) distribution model and particle size fractal theory. The influence of grinding time and particle group of CGS on the strength activity index of mortar was studied by using the strength activity index of mortar and grey correlation analysis. The results show that the particles are gradually refined before mechanical grinding of CGS for 75 min. When the mechanical grinding time is greater than 75 min, the “agglomeration phenomenon” of fine CGS particles led to the decrease in various properties. Divas–Aliavden grinding kinetics, the RRB model and fractal dimension can characterize the change of CGS particle size in the grinding process quantitatively. The strength activity index of CGS at different curing ages is positively correlated with grinding time, and the influence on the later strength activity index is the most obvious. The relationship between CGS particle size distribution and strength activity index were probed using grey correlation analysis. The CGS particle groups with the particle size of 20~30 μm and 10~20 μm have the greatest impact on the early and late strength activity index, respectively. Therefore, the optimal grinding time of CGS as auxiliary cementing material is 75 min, considering factors, such as economy and performance, and the specific surface area (SSA) is 4.4874 m2·g−1.

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Particle size analysis on wide size distribution powders; effect of sampling and characterization technique

Cited by 33 publications

References 18 publications

Reduction of the width of particle size distribution to improve pressure filtration properties of slurries

Reduction of the width of particle size distribution to improve pressure filtration properties of slurries

The significance of powder breakdown during conveying within industrial milk powder plants

Influence of Mechanical Grinding on Particle Characteristics of Coal Gasification Slag

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