Chryss, AG, Monch, A & Constanti-Carey, K 2019, 'Online rheology monitoring of a thickener underflow', in AJC Paterson, AB Fourie & D Reid (eds), Paste 2019: Proceedings of the 22nd International Conference on Paste, Thickened and Filtered Tailings
, Australian Centre for Geomechanics, Perth, pp. 495-504, https://doi.org/10.36487/ACG_rep/1910_37_Chryss
The perceived need for accurate and reliable methods of measuring suspension rheology in real time arises from the greater demands being placed on mineral processing operations. To extend mine life and reduce TSF footprint the adoption of finer grinds, higher solids concentration and high clay ores result in complex multiphase suspensions that need close monitoring to optimise thickener performance, pipeline transport and tailings deposition. Often the control of the processing or transport of these suspensions can be related to its rheology. However, due to the involved nature of rheological measurement for suspensions and the nuanced interpretation of data necessary to produce useful decisions, rheometry has only seen limited application in process monitoring. A robust unit that can measure, analyse and interpret the rheology of a process stream continuously and unattended is needed. The CSIRO has developed an online rheometer to address this problem. This paper describes the process prior to the deployment of the online rheometer to an Australian goldfield site, comparing online rheological measurement to benchmark laboratory values.
Keywords: slurry rheology, online rheometer
Barnes, HA 1999, ‘The yield stress-a review or ‘’-everything flows?’, Journal of non-Newtonian Fluid Mechanics, vol. 81, pp. 133‒178.
Barnes, HA, Hutton, JF & Walters, K 1989, An Introduction to Rheology, Elsevier Science Publishers, Amsterdam.
Calvo, G, Mudd, G, Valero, A & Valero, A 2016, ‘Decreasing ore grades in global metallic mining: a theoretical issue or a global reality?’, Resources, vol. 5, no. 4.
Chryss, A, Fourie, AB, Mönch, A, Nairn, D & Seddon, KD 2012, ‘Towards an integrated approach to tailings management’, Journal of the Southern African Institute of Mining and Metallurgy, vol. 112, no. 11, pp. 965‒969.
Chryss, AG, Bhattacharya, SN & Pullum, L 2005, ‘Rheology of shear thickening suspensions and the effects of wall slip in torsional flow’, Rheologica Acta, vol. 45, no. 2, pp. 124‒131.
Forbes, E & Chryss, A 2017, ‘Fundamentals of clays; surface and colloid science, and rheology’, in M Gräfe, C Klauber, A McFarlane & D Robinson (eds), Clays in the Minerals Processing Value Chain, Cambridge University Press, Cambridge, pp. 95‒103.
Govier, GW & Aziz, K 1977, The Flow of Complex Mixtures in Pipes, Krieger Publishing Company, Huntington.
MacSporran, WC 1989, ‘Direct numerical evaluation of shear rate in concentric cylinder viscometry using least-squares cubic splines’, Journal of Rheology, vol. 33, no. 5, pp. 745‒755.
Nguyen, QD & Boger, DV 1992, ‘Measuring the flow properties of yield stress fluids’, Annual Review of Fluid Mechanics, vol. 24, no. 47, pp. 47‒88.
Sengun, MZ & Probstein, RF 1989, ‘Bimodal model of slurry viscosity with application to coal-slurries. Part 1, Theory and experiment’, Rheologica Acta, vol. 28, no. 382.