Rheology of flocculated kaolinite dispersions

McFarlane, A. J., Addai-Mensah, J. and Bremmell, K. (2005) Rheology of flocculated kaolinite dispersions. Korea-Australia Rheology Journal, 17 4: 181-190.

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Author McFarlane, A. J.
Addai-Mensah, J.
Bremmell, K.
Title Rheology of flocculated kaolinite dispersions
Journal name Korea-Australia Rheology Journal   Check publisher's open access policy
ISSN 2093-7660
Publication date 2005-12
Sub-type Article (original research)
Volume 17
Issue 4
Start page 181
End page 190
Total pages 10
Place of publication Seoul, Republic of Korea
Publisher Korean Society of Rheology
Language eng
Formatted abstract
Rheological characterisation of flocculated kaolinite pulps has been undertaken to elucidate particle interactions underpinning the dewatering behaviour induced by flocculation with polyethylene oxide (PEO), anionic polyacrylamide (PAM A) and their blends. Shear yield stress (τy) analysis indicated that polymer mediated particle interactions were markedly amplified upon shear of PEO based pulps. In contrast, PAM A based pulps showed a significant decrease in yield values upon shear. Steady stress measurements analysed using a modified Ellis model indicated subtle differences between the respective linear viscoelastic plateaus of the pulps. Furthermore, modified shear thinning behaviour was evident in PEO based pulps. Estimation of elastic and viscous moduli (G′, G″) was made using dynamic stress analysis for comparison with values determined from vane measurements. Despite a noticeable difference in the magnitude of G′ between the two methods, similar trends indicating sheared PEO-based pulps to be more elastic than PAM based pulps, were observed. Floc microstructural observations obtained in support of rheological properties indicate that PEO flocculant induces significantly more compact particle aggregation within the clay pulps under shear consistent with the yield stress data, in contrast to PAM A, or indeed unsheared PEO based pulps. Consequentially, sheared PEO based pulps show significantly improved dewatering behaviour. The implications of the results, potential benefits and drawbacks of flocculation with PEO and PAM A are discussed with respect to improvements in current dewatering processes used in the minerals industry.
Keyword Kaolinite
Polyethylene oxide
Elastic modulus
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: Julius Kruttschnitt Mineral Research Centre Publications
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Created: Tue, 09 Aug 2011, 15:51:42 EST by Karen Holtham on behalf of Julius Kruttschnitt Mineral Research Centre