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Flotation and surface interactions of wollastonite/dodeclamine system
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.
2003 (English)In: IMPC XXII: XXII International Mineral Processing Congress ; Cape Town, South Africa, 29 September - 3 October 2003 / [ed] Leon Lorenzen, Marshalltown, South Africa: South African Institute of Mining and Metallurgy, 2003, p. 764-773Conference paper, Published paper (Refereed)
Abstract [en]

The solubility of wollastonite and its Hallimond flotation behavior as a function of dodecylamine concentration and pH are examined. The flotation response is characterized by adsorption and surface energy in the presence of amine. The methods of UV-Visible and FT-IR spectroscopy for adsorption and sessile-drop contact angle for surface energy estimation are employed. The results of wollastonite dissolution clearly showed its non uniform dissolution. The surfaces are depleted with calcium ions and became rich in silicon within 10 min of flotation time. Maximum flotation of wollastonite corresponds to a half monolayer coverage of amine, which is substantiated by the surface energy parameters. A good correlation between flotation, adsorption and surface energy as a function of amine concentration and pH was observed. The sudden increase in wollastonite flotation and amine adsorption at and above 5X10 (super -5) M initial amine concentration is thought to be due to two-dimensional precipitation of amine on surface in accordance with the recent 2D-3D precipitation model of amine adsorption on silicate minerals.

Place, publisher, year, edition, pages
Marshalltown, South Africa: South African Institute of Mining and Metallurgy, 2003. p. 764-773
National Category
Physical Chemistry Metallurgy and Metallic Materials
Research subject
Chemistry of Interfaces; Mineral Processing
Identifiers
URN: urn:nbn:se:ltu:diva-30597Local ID: 47437a60-a8af-11dc-9057-000ea68e967bISBN: 0-9584609-2-2 (print)OAI: oai:DiVA.org:ltu-30597DiVA, id: diva2:1003826
Conference
International Mineral Processing Congress : 29/09/2003 - 03/10/2003
Note
Godkänd; 2003; Bibliografisk uppgift: CD-ROM; 20071212 (ysko)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-25Bibliographically approved

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Rao, K. HanumanthaForsling, Willis

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