Estimation of the Average Aspect Ratio of Lamellae-Shaped Particles by Laser Diffractometry

Baudet, G.; Bizi, Mohamed; Rona, J. P.

doi:10.1080/02726359308906621

Cited by 22 publications

(5 citation statements)

References 3 publications

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“…2.00 with Hydro 2000 MU attachment (Malvern Ltd., UK). The detailed mathematical theory behind the aspect ratio measurement using this device was described in an application note published by the device manufacturer and in the literature (Baudet et al, 1993;De Ridder et al, 2000;Ma et al, 2000). The aspect ratio was briefly defined as the ratio between the actual volume concentration (c) introduced to the device and the calculated volume concentration (real volume) by the software program.…”

Section: Aspect Ratiomentioning

confidence: 99%

The effect of liquid grinding aids on the dry fine grinding of muscovite

Bozkurt,

Cayirli,

Gokcen

et al. 2023

Physicochem. Probl. Miner. Process.

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This paper investigates the production of a micronized muscovite to a target product size of d50~15 µm with a minimum energy consumption to suit the product requirements of the paint industry by a dry grinding process in a laboratory-scale vertical stirred ball mill. A series of batch dry grinding tests were conducted without and with two commonly used industrial liquid grinding aids, ethylene glycol (EG, C2H6O2) and triethanolamine (TEA, C6H15NO3). The results were evaluated based on particle size distribution (PSD), specific energy consumption, span value, and aspect ratio. The results showed that using liquid grinding aids resulted in a finer PSD, lower specific energy consumption, a narrower size distribution, lower span values, and a higher aspect ratio, which meant better delamination and improved grinding efficiency to that of no grinding aid. The interaction between grinding aids and ground muscovite surfaces was investigated by Fourier Transform Infrared Spectroscopy (FTIR). FTIR measurements revealed that EG and TEA were physically adsorbed on muscovite surfaces. Scanning Electron Microscopy (SEM) was also employed to determine differences between ground muscovite surfaces with and without grinding aids. SEM images indicated that grinding aids could prevent the agglomeration of ground muscovite particles while improving delamination. Adding grinding aids led to a decrease in muscovite agglomeration and an improvement in lamination owing to the adsorption of grinding aids on the particle surfaces.

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Section: Aspect Ratiomentioning

confidence: 99%

The effect of liquid grinding aids on the dry fine grinding of muscovite

Bozkurt,

Cayirli,

Gokcen

et al. 2023

Physicochem. Probl. Miner. Process.

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“…Following flocculation, by measuring the residual turbidity we are able to determine the number of non-flocculated particles. Assuming that the residual suspension is monodispersed with n nf particles per unit volume, i.e., all particles have the same diameter, light attenuation at wavelength λ 0 on the turbidity meter by n nf particles is determined by [ 9 , 29 ]:

The combination of Equations (1) and (18) results in:

where τ is the residual turbidity; I 0 is the intensity of the incident light; I T is the intensity of the transmitted light; L is the optical path length; C ext is the effective extinction cross-section of particles. C 1 , C 2 , C 3 and p are three constants that can be accessed using data processing software (Origin, TableCurve, etc.).…”

Section: Theorymentioning

confidence: 99%

A Semi-Empirical Model to Estimate Maximum Floc Size in a Turbulent Flow

Bizi

2022

Molecules

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The basic model for agglomerate breakage under the effect of hydrodynamic stress (dmax = C.G−γ) is only applicable for low velocity gradients (<500 s−1) and is often used for shear rates that are not representative of the global phenomenon. This paper presents a semi-empirical model that is able to predict mean floc size in a very broad shear range spanning from aggregation to floc fragmentation. Theoretical details and modifications relating to the orthokinetic flocculation output are also provided. Modelling changes in turbidity in relation to the velocity gradient with this model offer a mechanistic approach and provide kinetic agglomeration and breakage index ka and kb. The floc breakage mode is described by the relationship between the floc size and the Kolmogorov microscale. Shear-related floc restructuring is analysed by monitoring the fractal dimension. These models, as well as those used to determine floc porosity, density and volume fraction, are validated by the experimental results obtained from several flocculation operations conducted on ultrafine kaolin in a 4-litre reactor tank compliant with laws of geometric similarity. The velocity gradient range explored was from 60 to 6000 s−1.

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“…The fundamental principles of this technique have been dealt with in detail in a number of reports or publications [7,8]. It presents a number of advantages over classical methods such as electron microscopy or X-ray absorption (Sedigraph).…”

Section: Static Light-scattering Characterizationmentioning

confidence: 99%

“…1b. The relation between the power number and the Reynolds number is given by the empirical relationship dealt with in detail in a number of reports or publications [6][7][8]: This power curve was used to determine the torque T and rotational velocity N that would dissipate a given power P b during conditioning.…”

Section: Batch Flocculation Reactormentioning

confidence: 99%