Mechanism of starch adsorption on Fe–Mg–Al-bearing amphiboles

The specific affinity of iron minerals for starch has been successfully exploited in the selective flocculation and flotation of iron ores. The same phenomenon complicates the flotation separation between iron oxides, i.e., magnetite and Fe–Mg–Al-bearing silicates. Adsorption isotherms were construc...

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Bibliographic Details
Published in:International journal of mineral processing 2013-09, Vol.123, p.120-128
Main Authors: Filippov, L.O., Severov, V.V., Filippova, I.V.
Format: Article
Language:English
Subjects:
Adsorption
Amphiboles
Drift
Earth Sciences
Flotation
Iron ores
Magnetite
Quartz
Sciences of the Universe
Silicates
Starch
Starches
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Summary:The specific affinity of iron minerals for starch has been successfully exploited in the selective flocculation and flotation of iron ores. The same phenomenon complicates the flotation separation between iron oxides, i.e., magnetite and Fe–Mg–Al-bearing silicates. Adsorption isotherms were constructed, and the mechanisms of the adsorption of starch on quartz, magnetite and Fe–Mg–Al-bearing amphibole pargasite were discussed in this paper. The nature of the species adsorbed on minerals was determined by DRIFT and XPS spectroscopy. The flotation behaviour of magnetite and silicates at pH10 upon stirring in a starch solution was demonstrated. The adsorption and DRIFT study results concluded that starch is adsorbed both on quartz and amphiboles. However, the starch adsorption mechanism based on the chemical complexation is proposed to explain the strong depression effect of the starch during the magnetite and Fe–Mg–Al-bearing amphibole flotation with an amine compared with quartz. [Display omitted] •Adsorption model of starch on the quartz and Fe-bearing amphibole is proposed.•Starch attaches to the quartz and amphibole surfaces by hydrogen bonding.•Formation of chemical complex with surface metal atoms of amphiboles was suggested.•Starch cannot be considered as selective depressant for Fe-bearing minerals.
ISSN:0301-7516
1879-3525
DOI:10.1016/j.minpro.2013.05.010