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Mohammad Reza Garmsiri, Hassan Haji Amin.Shirazi
The effect of suspension properties on shear yield stress and compressibility of the suspension of copper flotation tailings
Appl. Rheol. 28:1 (2018) 15721 (8 pages)
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The performance of modern slurry dewatering equipment is essentially dependent on the efficiency of compression. Shear
yield stress as an index of flowability and compressibility is affected by suspension properties, while the presence of reagents
may be significant. In this work, the effect of fine fraction, pH, flocculant, and collector concentration on the shear yield stress
of copper flotation tailings at concentrators placed at Sarcheshmeh and Shahrebabak (Iran) were examined. Slump and settling
tests were utilized to investigate the shear yield stress and compressibility of suspension. A pilot scale column was also
employed to investigate the compressibility of suspension. Results indicated that shear yield stress increase, while compressibility
decrease with flocculant concentration and fine fraction. It was found that the shear yield stress steadily increased with
pH. Furthermore, in the presence of collectors the shear yield stress was reduced, while the compressibility enhanced.
► Cite this publication as follows:
Garmsiri MR, HajiAminShirazi H: The effect of suspension properties on shear yield stress and compressibility of the suspension of copper flotation tailings, Appl. Rheol. 28 (2018) 15721.
J. J. Duffy, C.A Rega, R Jack, S Amin
An algebraic approach for determining viscoelastic moduli from creep compliance through application of the Generalised Stokes-Einstein relation and Burgers model
Appl. Rheol. 26:1 (2016) 15130 (6 pages)
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DLS Microrheology involves tracking the time dependent motion or mean square displacement of dispersed tracer particles
of known size using Dynamic Light Scattering (DLS) in order to determine viscoelastic properties of the dispersion medium.
The viscoelastic moduli are calculated using a generalised form of the Stokes-Einstein equation which requires Fourier
Transformation of the MSD. An alternative approach for estimating the viscoelastic moduli uses a modified algebraic form of
the generalized Stokes-Einstein equation, which employs a power law expression to describe the local change in MSD with
time. Since the mean square displacement is linearly related to the creep compliance, it can be shown that the same algebraic
approach can also be applied to creep measurements made on a rotational rheometer, giving access to the low frequency
moduli in a fraction of the time required for oscillatory testing. Furthermore, the quality of the conversion process can be
improved by fitting a Burgers model to the time domain data prior to conversion thus minimising errors associated with local
differentiation, which is fundamental to the conversion approach.
► Cite this publication as follows:
Duffy JJ, Rega C, Jack R, Amin S: An algebraic approach for determining viscoelastic moduli from creep compliance through application of the Generalised Stokes-Einstein relation and Burgers model, Appl. Rheol. 26 (2016) 15130.
M.R. Garmsiri, H. Haji Amin.Shirazi, M.R. Yarahmadi
An analysis of the influence of cylinder dimension ratio and lifting velocity on the slump test results
Appl. Rheol. 25:2 (2015) 23416 (8 pages)
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As a fundamental rheological property, shear yield stress is used to assess the flowability of suspensions. Slump test is a
cheap and quick experiment which is commonly used to estimate shear yield stress on-site. It has been generally believed
that, cylinder height to diameter ratio and lifting velocity has no effect on the slump test results. In this work, the sensitivity
of the slump test to the height to diameter ratio and lifting velocity of cylinder was investigated. Projections on the top surface
of suspension column after the slump test were also analyzed. Results indicated that, the effect of cylinder height to
diameter ratio is negligible in the low range of shear yield stress, while it is remarkable in the high range. It was deduced that,
using a cylinder with dimension ratio in the range of 0.83 to 1.15 is more reliable. Furthermore, it is shown that the lifting
velocity of cylinder has a significant effect on the results. A high lifting velocity could introduce a great error in estimation
particularly in a large height to diameter ratio.
► Cite this publication as follows:
Garmsiri M, HajiAminShirazi H, Yarahmadi M: An analysis of the influence of cylinder dimension ratio and lifting velocity on the slump test results, Appl. Rheol. 25 (2015) 23416.
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