A preliminary rheological classification of phyllosilicate group minerals

Ndlovu, Bulelwa; Forbes, Elizaveta; Farrokhpay, Saeed; Becker, Megan; Bradshaw, Dee; Deglon, D.A.

doi:10.1016/j.mineng.2013.06.004

Cited by 91 publications

(53 citation statements)

References 75 publications

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“…The p.z.c. values of these minerals have previously been measured at pH 2.3 for quartz and pH 6.8 for illite [15]. Therefore, any elevation in the p.z.c value due to edge sites could be depressed by these impurities, resulting in a lower measured value.…”

Section: Accepted M Manuscriptmentioning

confidence: 96%

“…The impurities comprised mainly of quartz and illite. It has previously been shown that these minerals do not affect the suspension rheology [14,15]. While the colloidal behaviour can still be assumed to be largely due to the bulk mineralogy i.e.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

“…The rheological characteristics of kaolinite and other clay minerals suspensions have been extensively studied [5,8,15]. In general, mineral slurry behaviour tends to shift from Newtonian to strongly non-Newtonian as the solid concentration increases [31].…”

Section: Rheological Characterisationmentioning

confidence: 99%

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Characterisation of kaolinite colloidal and flow behaviour via crystallinity measurements

Ndlovu¹,

Farrokhpay²,

Forbes³

et al. 2015

Powder Technology

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Please cite this article as: Bulelwa Ndlovu, Saeed Farrokhpay, Elizaveta Forbes, Dee Bradshaw, Characterisation of kaolinite colloidal and flow behaviour using its crystallinity measurements, Powder Technology (2014Technology ( ), doi: 10.1016Technology ( /j.powtec.2014 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT AbstractThis study evaluates the possibility of predicting colloidal and flow behaviour of kaolinite suspensions by measuring kaolinite crystallinity. The Hinckley index of different samples was calculated from XRD spectra as an indicator of the crystallinity. Kaolinite samples with a high Hinckley index showed a defined platy morphology with smooth surfaces of low surface area, while progressively roughened basal planes with prevalent broken edges were observed in kaolinite samples of lower Hinckley indices. Despite similarity in the elemental composition, the kaolinite samples present different surface charge properties, likely due to variations in exposed pH dependent edge sites. Poorly crystallised kaolinite samples were characterised by higher yield stresses and viscosities. This study highlights the importance of crystallinity characterisation towards predicting colloidal behaviour and flow characteristics of kaolinite suspensions.

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Section: Accepted M Manuscriptmentioning

confidence: 96%

Section: Accepted Manuscriptmentioning

confidence: 99%

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Characterisation of kaolinite colloidal and flow behaviour via crystallinity measurements

Ndlovu¹,

Farrokhpay²,

Forbes³

et al. 2015

Powder Technology

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“…The basal planes displaying an inert siloxane structure are commonly charged negative charge [41][42][43][44][45][46]. While the edge planes are consisting of alternating layers of tetrahedral silicates and octahedral aluminum oxy-hydroxides.…”

Section: Discussionmentioning

confidence: 99%

N-(6-(hydroxyamino)-6-oxohexyl) decanamide collector: Flotation performance and adsorption mechanism to diaspore

Deng

Wang

Zhong

et al. 2015

Applied Surface Science

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“…These forces in clay suspensions have been reviewed by McBride and Baveye [55]. The more recent possibility to add to these forces came from the observations [7,56] of higher surface concentrations of step (defect) sites on low-crystallinity…”

Section: Particle Size Effect and Surface Force Considerationsmentioning

confidence: 99%

Surface chemistry–microstructure–rheology of high and low crystallinity KGa-1b and KGa-2 kaolinite suspensions

Clode

Smart

et al. 2015

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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A preliminary rheological classification of phyllosilicate group minerals

Cited by 91 publications

References 75 publications

Characterisation of kaolinite colloidal and flow behaviour via crystallinity measurements

Characterisation of kaolinite colloidal and flow behaviour via crystallinity measurements

N-(6-(hydroxyamino)-6-oxohexyl) decanamide collector: Flotation performance and adsorption mechanism to diaspore

Surface chemistry–microstructure–rheology of high and low crystallinity KGa-1b and KGa-2 kaolinite suspensions

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