In situ characterisation of a concentrated colloidal titanium dioxide settling suspension and associated bed development: application of an acoustic backscatter system

Bux, Jaiyana, Peakall, Jeff, Biggs, Simon and Hunter, Timothy N. (2015) In situ characterisation of a concentrated colloidal titanium dioxide settling suspension and associated bed development: application of an acoustic backscatter system. Powder Technology, 284 530-540. doi:10.1016/j.powtec.2015.07.028


Author Bux, Jaiyana
Peakall, Jeff
Biggs, Simon
Hunter, Timothy N.
Title In situ characterisation of a concentrated colloidal titanium dioxide settling suspension and associated bed development: application of an acoustic backscatter system
Journal name Powder Technology   Check publisher's open access policy
ISSN 1873-328X
0032-5910
Publication date 2015-11-01
Year available 2015
Sub-type Article (original research)
DOI 10.1016/j.powtec.2015.07.028
Open Access Status Not Open Access
Volume 284
Start page 530
End page 540
Total pages 11
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Collection year 2016
Language eng
Abstract The ability to accurately characterise the settling of particulate suspensions is imperative in numerous industries for improved processing, optimisation and control. Characterisation is typically a non-trivial process, and in situ measurements that remove the restriction of requiring particular sample sizes are preferred. Here, for the first time, we explore the use of an acoustic backscatter system (ABS) to characterise key settling dynamics within a common colloidal mineral suspension, where backscatter attenuation is heightened due to the associated low scattering cross sections of the particles. Settling titanium dioxide dispersions with concentrations ranging from 0.05 to 3.00 vol% were successfully profiled using ABS transducers of 1, 2 and 4 MHz frequencies. This approach enabled the simultaneous visualisation of both the settling interface and sediment bed formation, generating sedimentation curves and elucidating settling velocities. Furthermore, backscatter attenuation was empirically correlated with the attenuation–concentration relationship established for homogenous dispersions, to obtain concentration profiles of the settling suspensions. The data depicted concentration changes as a function of time in a hindered settling suspension, and allowed observation of the segregation of a size polydisperse suspension. Data were compared with sedimentation data obtained via two common ex situ bench scale techniques. Critically, the acoustic backscatter method was validated as a powerful in situ characterisation tool for opaque concentrated heterogeneous dispersions, with the ability to provide concentration density information in conjunction with settling kinetics that are not easily attainable via other methods.
Keyword Acoustic backscatter
Colloidal
Sedimentation
Characterisation
Concentration
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Faculty of Engineering, Architecture and Information Technology Publications
Non HERDC
 
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