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Role of non-ionic surfactant in fatty acid phosphate gangue flotation from magnetite fines
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.
2010 (English)In: Conference in Minerals Engineering: Luleå, 2 -3 februari 2010 / [ed] Johanna Alatalo, Luleå: Luleå tekniska universitet, 2010, 169-183 p.Conference paper (Other academic)
Abstract [en]

Adsorption, contact angle and flotation of anionic Atrac and non-ionic ethaloxylated nonylphenol surfactant, and their mixture on apatite and magnetite were studied. The effect of calcium ions and sodium silicate on Atrac adsorption was investigated. The effect of Atrac adsorption on the contact angle data of apatite and magnetite in the presence and absence of sodium silicate was also examined. Wettability of solids depends on solids surface free energy and the surface energies of apatite and magnetite powders were calculated from polar and non-polar liquid contact angle data.A decrease in particle size increased the polar contribution to surface free energy due to unsaturated broken bonds on the surface. Atrac is seen to adsorb equally on apatite and magnetite, and the adsorption increased in the presence of calcium ions. The presence of water glass decreased the Atrac contact angle data on magnetite and also the flotation response demonstrating its role as magnetite depressant in flotation. The presence of non-ionic surfactant enhanced the Atrac flotation of apatite with no flotation of magnetite. Bench-scale flotation tests showed that 50% of Atrac can be replaced with non-ionic collector without impairing the flotation results. Results also illustrate that the non-ionic adsorbs on apatite in equal amount of Atrac collector signifying 1:1 composition of anionic and non-ionic collector on apatite surface. Non-ionic head group sitting in between anionic head groups screens the electrostatic repulsion and forms compact adsorbed layer on apatite surface thereby increasing the hydrophobicity and flotation.

Place, publisher, year, edition, pages
Luleå: Luleå tekniska universitet, 2010. 169-183 p.
Research subject
Mineral Processing
URN: urn:nbn:se:ltu:diva-34378Local ID: 88e858c0-6331-11df-ab16-000ea68e967bISBN: 978-91-7439-097-1 (PDF)OAI: diva2:1007629
Konferens i mineralteknik 2010 : 02/02/2010 - 03/02/2010
Godkänd; 2010; 20100519 (ysko)Available from: 2016-09-30 Created: 2016-09-30Bibliographically approved

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