The effects of chrysotile mineralogical properties on the rheology of chrysotile suspensions

Ndlovu, B. N., Forbes, E., Becker, M., Deglon, D. A., Franzidis, J. P. and Laskowski, J. S. (2011) The effects of chrysotile mineralogical properties on the rheology of chrysotile suspensions. Minerals Engineering, 24 9: 1004-1009. doi:10.1016/j.mineng.2011.04.025


Author Ndlovu, B. N.
Forbes, E.
Becker, M.
Deglon, D. A.
Franzidis, J. P.
Laskowski, J. S.
Title The effects of chrysotile mineralogical properties on the rheology of chrysotile suspensions
Journal name Minerals Engineering   Check publisher's open access policy
ISSN 0892-6875
1872-9444
Publication date 2011-08
Sub-type Article (original research)
DOI 10.1016/j.mineng.2011.04.025
Open Access Status
Volume 24
Issue 9
Start page 1004
End page 1009
Total pages 6
Place of publication East Park, Kidlington, Oxford, U.K.
Publisher Pergamon
Collection year 2012
Language eng
Formatted abstract
Chrysotile (serpentine) is a phyllosilicate mineral that occurs as a major gangue mineral in many ores (e.g. Mt. Keith nickel sulphide ore, Western Australia). It is believed that the distinctive morphology and electrical surface charge of chrysotile particles are central to the problematic rheological behaviour and low solids throughput typically experienced in the processing of such ores. This study investigates the effects of both these factors on the rheology of chrysotile suspensions.

Chrysotile particles were found to carry a net positive charge over the range pH 2–11, with an apparent point of zero charge at pH 8.23. This is a direct result of the convoluted mineral structure of chrysotile fibres, which comprise a positively charged brucite outer layer. The disparity in the point of zero charge and range of maximum yield stress for chrysotile is consistent with the anisotropic nature of chrysotile particles. The long, thin fibres are easily entangled to form suspensions with much higher plastic viscosities and Bingham yield stresses than non-fibrous particles.

Although chrysotile shape and surface charge are fundamental to the rheology of chrysotile suspensions, it was found that shape plays a more significant role.
Keyword Chrysotile
Phyllosilicate
Bingham yield stress
Plastic viscosity
Electrokinetic behaviour
Potentiometric titration
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Julius Kruttschnitt Mineral Research Centre Publications
Non HERDC
 
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Citation counts: TR Web of Science Citation Count  Cited 8 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 9 times in Scopus Article | Citations
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Created: Mon, 02 Apr 2012, 13:18:15 EST by Karen Holtham on behalf of Julius Kruttschnitt Mineral Research Centre