The effect of calcium ions and sodium silicate on the adsorption of a model anionic flotation collector on magnetite studied by ATR-FTIR spectroscopy

Potapova, Elisaveta; Grahn, Mattias; Holmgren, Allan; Hedlund, Jonas

doi:10.1016/j.jcis.2010.01.056

Cited by 43 publications

(27 citation statements)

References 37 publications

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“…ions resulted in an increased contact angle of magnetite concentrate, despite the pre-treatment with water glass, due to the activation of the magnetite surface for collector adsorption by calcium ions, in accordance with conclusions drawn from spectroscopy data and reported previously (Potapova et al, 2010b). Adsorption of water glass is expected to result in a better wetting and protect magnetite from collector adsorption, whereas collector adsorption (before bi-layer structure formation) has an opposite effect on wettability.…”

Section: Adsorption Of Flotation Reagents and Effect On Magnetite Sursupporting

confidence: 91%

“…Magnetite nanocrystals were synthesized and purified according to the procedure described previously (Potapova et al, 2010b). A dispersion of magnetite in distilled water was further diluted with methanol and degassed distilled water resulting in a working dispersion containing 25 vol.% methanol and ca 1.1 mg mL À1 magnetite.…”

Section: Methodsmentioning

confidence: 99%

“…Previously, it was concluded that carboxylate ions were not likely to be responsible for collector adsorption on iron oxides at pH 8.5 in the absence of a background electrolyte due to electrostatic repulsion (Potapova et al, 2010a) and that the adsorption took place via the non-charged polar ester carbonyl and ethoxy groups. However, the presence of a background electrolyte in the present work could reduce the repulsion between the ions and the magnetite surface further facilitating collector adsorption (Potapova et al, 2010b).…”

Section: Adsorption Behaviour Of Model Compounds and Commercial Flotamentioning

confidence: 98%

“…The effect of calcium ions and sodium metasilicate on the adsorption of the model collector on synthetic magnetite was investigated in our previous work (Potapova et al, 2010b). It was concluded that sodium metasilicate could suppress the adsorption of the model collector on magnetite but only in the absence of calcium ions.…”

Section: Adsorption Of Flotation Reagents and Effect On Magnetite Surmentioning

confidence: 99%

“…The pH of the solution was controlled by a Mettler Toledo T70 titrator. Further experimental details are described elsewhere (Potapova et al, 2010b;Yang et al, 2008).…”

Section: In Situ Atr-ftir Spectroscopymentioning

confidence: 99%

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Interfacial properties of natural magnetite particles compared with their synthetic analogue

Potapova

Yang

Westerstrand

et al. 2012

Minerals Engineering

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a b s t r a c tUnderstanding of the interactions between iron oxides and flotation reagents is important both for flotation and agglomeration of iron ore. Model systems comprising synthetic iron oxides and pure chemical reagents are commonly applied in experimental work in order to obtain high quality data and to ease the interpretation of the empirical data. Whether the results obtained using model systems are valid for iron ore minerals and commercial reagents is a question seldom addressed in the literature. It is shown in this work that previously reported results obtained from a model system, concerning adsorption of a carboxylate surfactant and sodium metasilicate onto synthetic magnetite nanoparticles, as obtained by in situ ATR-FTIR spectroscopy and contact angle measurements, are applicable to adsorption of flotation reagents on magnetite concentrate. Additionally, the problem of restoring magnetite wetting after flotation is addressed since good wetting of a magnetite concentrate is required to produce iron ore pellets by wet agglomeration. The results from the present work indicate that the wettability of both synthetic magnetite coated with surfactant and magnetite concentrate after flotation can be improved by adsorbing a hydrophilizing agent such as silicate or polyacrylate.

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Section: Adsorption Of Flotation Reagents and Effect On Magnetite Sursupporting

confidence: 91%

Section: Methodsmentioning

confidence: 99%

Section: Adsorption Behaviour Of Model Compounds and Commercial Flotamentioning

confidence: 98%

Section: Adsorption Of Flotation Reagents and Effect On Magnetite Surmentioning

confidence: 99%

“…The pH of the solution was controlled by a Mettler Toledo T70 titrator. Further experimental details are described elsewhere (Potapova et al, 2010b;Yang et al, 2008).…”

Section: In Situ Atr-ftir Spectroscopymentioning

confidence: 99%

See 3 more Smart Citations