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Dependence of shear-flocculation on surface coverage and zeta potential
Luleå tekniska universitet.
CRVM/CNRS, Vandouevre-les-Nancy.
1990 (English)In: International Journal of Mineral Processing, ISSN 0301-7516, E-ISSN 1879-3525, Vol. 28, no 3-4, p. 161-172Article in journal (Refereed) Published
Abstract [en]

The dependence of shear-flocculation on surface coverage and zeta potential is elucidated using a model system of fluorite/scheelite/oleate. The experiments carried out were (1) shear-flocculation, (2) oleate adsorption/abstraction, (3) flotation of the shear flocs, (4) zeta potential, and (5) turbidity. At a sufficiently high constant shear both an increase in surface coverage and a decrease in zeta potential lead to an increase in the amount of shear flocculating. Manipulation of these two factors permits the turbidity to be reduced from as high as 450 NTU (Θ(surface coverage) = .5; ζ (zeta potential) = -40 mV) to as low as 40 NTU (Θ= 1.2; ζ = -29 mV) in the case of scheelite. With fluorite, turbidity drop is from 120 NTU (Θ= 1; ζ= -40 mV) to 20 NTU (Θ= 1.5; ζ= -19 mV). A close relationship exists between the turbidity measurements and the amount of shear flocculating in percentage. The total flotation of the shear flocs is possible at apparent surface coverages corresponding to a partly formed bilayer

Place, publisher, year, edition, pages
1990. Vol. 28, no 3-4, p. 161-172
National Category
Metallurgy and Metallic Materials
Research subject
Mineral Processing
Identifiers
URN: urn:nbn:se:ltu:diva-6683DOI: 10.1016/0301-7516(90)90039-2ISI: A1990DL40900001Scopus ID: 2-s2.0-0025428876Local ID: 4f224530-2cbd-11dd-9c9b-000ea68e967bOAI: oai:DiVA.org:ltu-6683DiVA, id: diva2:979569
Note
Godkänd; 1990; 20080528 (cira)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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