Surface chemistry–rheology relationships in concentrated mineral suspensions

Johnson, Stephen B.; Franks, George V.; Scales, Peter J.; Boger, David V.; Healy, Thomas W.

doi:10.1016/s0301-7516(99)00041-1

Cited by 322 publications

(173 citation statements)

References 105 publications

Supporting

Mentioning

160

Contrasting

Unclassified

Order By: Relevance

“…However, given the pH-dependence and anisotropy of surface charge for the irregular-shaped clay minerals, as well as their interactions with a myriad of dissolved species in typical industrial process water, additional non-DLVO interactions and complex dispersion stability behaviours can be expected and have indeed been reported Johnson, et al, 2000). Hydration and steric interactions stemming from adsorbed layers of water and macromolecules increase the mutual repulsion between suspended particles, while surfactantmodified or naturally hydrophobic particle surfaces experience an additional attraction to surfaces of similar nature -hydrophobic force (Israelachvili, 2011).…”

Section: Size Classificationmentioning

confidence: 99%

“…Consequently, the solids aggregate at larger separation distances where the secondary interaction energy minimum occurs to form loose and porous aggregates. For clays, a "card house" structure is often observed at intermediate pH and for low aspect ratio clays, where the dominant inter-particle orientation consists of basal plane-edge surface interaction due to anisotropic surface charge characteristics of basal planes and edge surfaces, as shown in Figure 3 (Johnson, et al, 2000;Gupta, et al, 2011;Yan, et al, 2013). At high pH, the charge repulsion between the negatively charged basal plane and edge surface is sufficient to stabilize the particles in the suspension.…”

Section: Slurry Rheologymentioning

confidence: 99%

See 1 more Smart Citation

Current state of fine mineral tailings treatment: A critical review on theory and practice

Wang

Harbottle

Liu

et al. 2014

Minerals Engineering

344

169

View full text Add to dashboard Cite

Highlights Presented facts on escalating generation of fine mineral tailings worldwide.  Overview of coal, alumina, oil sands, and base metals tailings characteristics.  Reviewed theoretical and industrial developments for tailings management.  Determined numerous knowledge gaps between current theories and practices.  Identified opportunities for improvement towards more sustainable practices. Graphical AbstractEvolution of fine mineral tailings treatment objectives.Figures "Flocculated solids" and "Stackable solids" are adopted from Alamgir, et al. (2012), permission pending. The last figure "Reclaimed land" is adopted from Golder Associates (2009), permission pending. AbstractThe mining industry produces fluid fine mineral tailings on the order of millions of tonnes each year, with billions of tonnes already stored globally. This trend is expected to escalate as demand for mineral products continues to grow with increasingly lower grade ores being more commonly exploited by hydrometallurgy. Ubiquitous presence and enrichment of fine solids such as silt and clays in fluid fine mineral tailings prevent efficient solid-liquid separation and timely re-use of valuable process water. Long-term storage of such fluid waste materials not only incurs a huge operating cost, but also creates substantial environmental liabilities of tailings ponds for mining operators. This review broadly examines current theoretical understandings and prevalent industrial practices on treating fine mineral tailings for greater water recovery and reduced environmental footprint of mining operations.

show abstract

Section: Size Classificationmentioning

confidence: 99%

Section: Slurry Rheologymentioning

confidence: 99%

Current state of fine mineral tailings treatment: A critical review on theory and practice

Wang

Harbottle

Liu

et al. 2014

Minerals Engineering

344

169

View full text Add to dashboard Cite

show abstract

“…This renders the edge charge more significant. The changes in particle alignment as a function of pH are discussed in more detail by several researchers [1,2,7].…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

“…Therefore, at pH conditions well above the edge i.e.p, the system should become dispersed, due to the repulsion between edge and basal face sites. On this basis, it is generally assumed that all kaolinite suspensions will predominantly comprise a combination of EE and dispersed structures at pH 9 [7]. Such suspensions would be characterised by low yield stresses and viscosities.…”

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%

See 1 more Smart Citation

Characterisation of kaolinite colloidal and flow behaviour via crystallinity measurements

Ndlovu¹,

Farrokhpay²,

Forbes³

et al. 2015

Powder Technology

View full text Add to dashboard Cite

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.

show abstract

References

2008

Introduction to Particle Technology

View full text Add to dashboard Cite

Surface chemistry–rheology relationships in concentrated mineral suspensions

Cited by 322 publications

References 105 publications

Current state of fine mineral tailings treatment: A critical review on theory and practice

Current state of fine mineral tailings treatment: A critical review on theory and practice

Characterisation of kaolinite colloidal and flow behaviour via crystallinity measurements

References

Contact Info

Product

Resources

About