Microstructure, rheology and dewatering behaviour of smectite dispersions during orthokinetic flocculation

McFarlane, Angus; Bremmell, Kristin Elizabeth; Addai‐Mensah, Jonas

doi:10.1016/j.mineng.2005.06.013

Cited by 50 publications

(25 citation statements)

References 15 publications

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“…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%

“…There have been extensive studies on the physico-chemical properties of kaolinite including the effect of factors such as pH, electrolyte type and ionic concentration [5][6][7]. The importance of physical properties such as particle shape, aspect ratio and surface area towards suspension colloidal behaviour has also been demonstrated [4,[8][9][10].…”

Section: Introductionmentioning

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: Rheological Characterisationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Characterisation of kaolinite colloidal and flow behaviour via crystallinity measurements

Ndlovu¹,

Farrokhpay²,

Forbes³

et al. 2015

Powder Technology

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show abstract

“…Research of polyacrylamide and its copolymers is one of the most popular hot aspects because the reasonable cost, easy polymerization and good-treatment result. Different kinds of derivates of poly-acrylamide have been prepared in order to treat different kinds of wastewater, and improved flocculation performances were demonstrated [1][2][3][4]. In the past few decades, researchers have found hydrophobically modified polymers showed excellent properties in the oily wastewater treatment in oil recovery operations and were effective in cleaning up organic contaminants in wastewater.…”

Section: Introductionmentioning

confidence: 99%

Effect of hydrophobic group on flocculation properties and dewatering efficiency of cationic acrylamide copolymers

Ren

Chen

Zheng

et al. 2007

Reactive and Functional Polymers

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Three kinds of hydrophobically modified copolymers of acrylamide with 3-acrylamido-2-hydroxypropyltrialkylammonium chloride were prepared, in which alkyls were ethyl, butyl and octyl, respectively. The conformations of the hydrophobically modified copolymers were studied using TEM micrograph. The flocculation performances and the dewatering efficiencies were investigated. The results showed that the hydrophobic group could enhance the flocculation properties. The longer the hydrophobic alkyl chain was, the better the flocculation result was. Compared with poly-diallyldimethyl ammonium chloride (PDADMAC) and poly-acrylamide (PAM), the hydrophobically modified polymers showed better performances in turbidity removal and were quite more efficient in dewatering examination.

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“…Enrichment of minerals by flotation could be effected by interaction of particles the rheological data present an approach to directly understand this interaction. The rheology has been used to investigate particle-particle interactions in slurries of oxide minerals [18][19][20], clays and clay minerals [21][22][23][24], coal [25,26], sulphide minerals [27], and even gangue minerals such as talc [28][29][30]. Accurate measurement of the rheological properties of pulp is rather difficult, because the solid particles tend to settle during measurement.…”

Section: The Use Of Viscosity Modifiersmentioning

confidence: 99%

Control of clay minerals effect in flotation. A review

Taner

Önen

2016

E3S Web Conf.

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Abstract. The increased exposure to low grade ores highlights the importance of understanding phyllosilicate gangue mineralogy which consists of common gangue minerals. To improve the flotation performance and ore quality the negative effect of the clay minerals on flotation should be identified. The presence of clay minerals leads to problems, such as changing the froth stability, which are related to swelling behaviour, increase in pulp viscosity, overconsumption of reagents, slime coating and mechanical entrainment. The clay content in the ore is changing from time to time and it is necessary to provide quick solutions to the issues caused by the new ore composition. The objective of this paper is to give an overview how to control the colloidal properties of clay minerals on flotation.

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Microstructure, rheology and dewatering behaviour of smectite dispersions during orthokinetic flocculation

Cited by 50 publications

References 15 publications

Characterisation of kaolinite colloidal and flow behaviour via crystallinity measurements

Characterisation of kaolinite colloidal and flow behaviour via crystallinity measurements

Effect of hydrophobic group on flocculation properties and dewatering efficiency of cationic acrylamide copolymers

Control of clay minerals effect in flotation. A review

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