Selective flocculation of ultrafine iron ore. 1. Mechanism of adsorption of starch onto hematite

Weisseborn, P.K; Warren, L.J.; Dunn, J.G.

doi:10.1016/0927-7757(95)03111-p

Cited by 129 publications

(48 citation statements)

References 28 publications

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“…The adsorption mechanism and interaction between Fe(III) and starch or other carbohydrates containing variable functionalities have been intensively studied for years [8,[12][13][14][15][16][17][18][19][20][21].…”

Section: à39mentioning

confidence: 99%

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Complexation of Fe(III) with water‐soluble oxidized starch

et al. 2012

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In this work, we have studied the use of the oxidized starch as a water-soluble complexing agent for Fe(III) in alkaline conditions. Fe(III) was completely soluble in alkaline solutions with a 0.65:1 molar ratio of the oxidized starch-to-Fe(III) ion. The oxidized starch could also solubilize precipitated Fe(OH) 3 under alkaline conditions. FT-IR measurements of the oxidized starch-Fe(III) complex indicated that there was a direct coordination between anionic ligands (-O À and -COO À ) of starch and the Fe(III) ion. Additionally, hydrogen bonding occurred between hydroxyl groups of oxidized starch and Fe(III) which decreased as pH increased. It was also detected that the binding mechanism did change according to the pH of the Fe(III) solution of the oxidized starch addition.

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Section: à39mentioning

confidence: 99%

“…Starch and other polysaccharides have been used in the mining industry as flocculants [7,8] and in froth flotation as a depressant [6,9]. Under acidic conditions cross-linked carboxymethylated starch has been used as a Fe(II) trap [10].…”

Section: Introductionmentioning

confidence: 99%

Complexation of Fe(III) with water‐soluble oxidized starch

et al. 2012

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“…However, based on our findings above, the trend is opposite (Table 6). This is possibly attributed to the agglomeration/clustering of ceramic and starch particles as discussed above 34 . The starch adsorption onto ceramic surfaces is also aggravated by the presence of iron in clay as hematite mineral to cause flocculation.…”

Section: Rheological Characteristics Of Ceramic Slurries Loaded With mentioning

confidence: 99%

Aqueous dispersion of red clay-based ceramic powder with the addition of starch

Umaran

Menchavez

2013

Mat. Res.

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The optimum dispersion and rheological properties of red clay-based ceramic suspension loaded with unary and binary starch were investigated in aqueous medium. The aqueous ceramic suspension was prepared consisting of red clay, quartz, feldspar, and distilled water. Using a polyelectrolyte dispersant (Darvan 821A), the ternary ceramic powder was initially optimized to give the smallest average particle size at 0.8 wt. (%) dispersant dosage as supported by sedimentation test. This resulted into an optimum high solid loading of 55 wt. (%). The addition of either unary or binary starches to the optimized ceramic slurry increased the viscosity but maintained an acceptable fluidity. The mechanism of such viscosity increase was found to be due to an adsorption of starch granules onto ceramic surfaces causing tolerable agglomeration. Correspondingly, the rheological evaluations showed that the flow behaviors of all starch-loaded ceramic slurries can be described using Herschel-Bulkley model. The parameters from this model indicated that all ceramic slurries loaded with starch are shear thinning that is required for direct casting process.

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“…Then the slurry was heated at a temperature of 80-85 degree centigrade to make a clear solution. The flocculant solution so prepared should be used within 24 hour before it gets damaged [6]. Fourier transform infrared (FTIR) spectroscopy test was performed on the corn starch solution to find out the functional groups present.…”

Section: Methodsmentioning

confidence: 99%

“…using both natural as well as synthetic flocculant [1][2][3][4][5]. In addition to these a substantial work has been done in understanding the mechanism of the selective flocculation [6,7]. In this work an attempt has been made to optimize the effect of different parameters like solid concentration, pH and…”

Section: Introductionmentioning

confidence: 99%