Studies on the influence of a flotation collector reagent on iron ore green pellet properties

Forsmo, S.P.E.; Forsmo, S.-E.; Björkman, Bo; Samskog, Per-Olof

doi:10.1016/j.powtec.2007.07.015

Cited by 42 publications

(23 citation statements)

References 6 publications

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“…Forsmo et al [10] showed that even small amounts of the collector added to the balling feed caused a significant decrease in the green (before thermal treatment) pellet strength. As suggested by the authors, the collector adsorbed on magnetite decreases its wettability, resulting in the formation of stable air bubbles inside the pellet, which in turn compromises green pellet strength.…”

Section: Introductionmentioning

confidence: 99%

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

Grahn

Holmgren

et al. 2010

Journal of Colloid and Interface Science

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Section: Introductionmentioning

confidence: 99%

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

Grahn

Holmgren

et al. 2010

Journal of Colloid and Interface Science

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“…In addition it may be necessary to use a collector for reversed flotation of apatite from magnetite, as is the case at Luossavaara-Kirunavaara AB (LKAB) in Sweden. This reagent is applied to minimize the apatite content by froth flotation, but a small amount of the collector may also adsorb at the magnetite particle surfaces and such a wetting modification was recently shown to affect the strength of the green pellets formed in the pelletizing process [1]. Thus, it is important to reduce the adsorption of this collector in order to further improve the strength of the pellets.…”

Section: Introductionmentioning

confidence: 99%

Competition between sodium oleate and sodium silicate for a silicate/oleate modified magnetite surface studied by in situ ATR-FTIR spectroscopy

Roonasi

Yang

Holmgren

2010

Journal of Colloid and Interface Science

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Competition between sodium oleate and sodium silicate for a silicate/oleate modified magnetite surface studied by in situ ATR-FTIR spectroscopy Attenuated Total Reflection (ATR) IR spectroscopy was utilized to monitor adsorption of sodium oleate and sodium silicate onto synthetic magnetite at pH = 8.5, both individually and in a competitive manner.Oleate was adsorbed within a concentration range of 0.01-0.5 mM. It was observed that adsorption of oleate increased linearly with increasing concentration of oleate in solution up to a concentration of 0.1 mM. The infrared spectrum of oleate showed a broad single band at 1535 cm À1 assigned to the asymmetric stretching vibration of carboxylate, implying chemisorption of oleate to the magnetite surface. The kinetics of oleate adsorption followed a pseudo first-order reaction with an apparent rate constant of k 1 = 0.030 ± 0.002 min À1. Competitve adsorption of silicate and oleate was performed either by adding silicate solution to a magnetite film initially equilibrated with 0.1 mM oleate or adding oleate solution to magnetite treated with silicate solutions in the concentration range 0.1-5 mM. It was shown that silicate, within reasonable time, had only minor effect on the amount of oleate already adsorbed on magnetite. On the other hand, oleate did not efficiently compete with silicate if the latter substance was already adsorbed on the iron oxide.

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“…For the case of natural magnetite used in this work, the high contact angle could also be caused by adsorbed flotation collector since the iron ore was concentrated both by magnetic separation and flotation. The amount of flotation collector adsorbed on the magnetite surface after flotation was previously estimated to be 10-30 g t À1 (Forsmo et al, 2008). Already a partial coverage by a surfactant could be enough to obtain a hydrophobic surface (Holmberg et al, 2003).…”

Section: Resultsmentioning

confidence: 99%

“…In the present work, the surface of the magnetite concentrate had a contact angle of 60°at the highest concentration of the collector and would probably not be hydrophobic enough to result in the flotation of magnetite. However, hydrophobic areas on the magnetite surface impair wetting of the concentrate and may result in air inclusions inside the green pellets produced by the agglomeration of the magnetite concentrate, which has previously been shown to reduce pellet strength in both wet and dry state (Forsmo et al, 2008).…”

Section: Adsorption Of Flotation Reagents and Effect On Magnetite Surmentioning

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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Studies on the influence of a flotation collector reagent on iron ore green pellet properties

Cited by 42 publications

References 6 publications

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

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

Competition between sodium oleate and sodium silicate for a silicate/oleate modified magnetite surface studied by in situ ATR-FTIR spectroscopy

Interfacial properties of natural magnetite particles compared with their synthetic analogue

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