Current understanding of the mechanism of polysaccharide adsorption at the mineral/aqueous solution interface

Laskowski, J.; Liu, Qingxia; O’Connor, C.T.

doi:10.1016/j.minpro.2007.03.006

Cited by 185 publications

(79 citation statements)

References 24 publications

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“…Chemical interaction between the carboxyl groups of the organic materials and copper, molybdenum or iron mineral sites is possible [57], although tannic acid does not have any carboxyl groups but does adsorb and depress mineral flotation. However, it has been postulated that chemical interactions between the hydroxyl groups of polysaccharide (e.g., guar gum) with the metal hydroxyl groups at the mineral surface (e.g., chalcopyrite) may also occur in addition to hydrogen bonding [58,59]. A similar observation has been made for the interaction of biosolids with chalcopyrite, molybdenite and pyrite, although a weaker interaction such as hydrogen bonding or van der Waals force was proposed for the interaction of humic acid with these sulphide minerals [27,60].…”

Section: Discussionmentioning

confidence: 99%

Flotation of Chalcopyrite and Molybdenite in the Presence of Organics in Water

2016

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Abstract:One of the water constituents that has not been investigated in great detail for potential detrimental effect on mineral flotation is organic matter. This study investigates the effect of natural organic materials contained in water, such as humic, fulvic and tannic acids, on the flotation of copper and molybdenum sulphides in alkaline conditions and in concentrations similar to those found in natural waters. Results show that copper and molybdenum grades decreased with the addition of humic, tannic and fulvic acid in that order, with a larger depression of molybdenite grade and recovery. Adsorption studies using ultraviolet (UV)-visible spectroscopy and X-ray photoelectron spectrometer (XPS) surface analysis confirmed that these organic materials were adsorbed on the minerals surface. Complimentary analyses of froth characteristics, particle size distribution and fine particles entrainment were also conducted to explain the cause of the negative effect of these organic materials on flotation. The flotation results were explained in terms of the decrease in the hydrophobicity of the mineral surfaces due to the adsorption of hydrophilic groups in these organic materials which then prevent bubble-particle adhesion. The larger detrimental effect of humic acid is due to its higher adsorption on the minerals, high molecular weight and carbon content compared with the other organic acids used.

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Section: Discussionmentioning

confidence: 99%

Flotation of Chalcopyrite and Molybdenite in the Presence of Organics in Water

2016

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“…The hydroxyl (-OH) groups on C-2 and C-3 carbon atoms in a glucose unit of cellulose ethers can participate in complex reaction [13] , such as complexing the aluminate, ferrite or silicate ions [9] . Pourchez et al [10,11] observed a high CEs adsorption capacity on some hydrated phases such as C-S-H, CH and calcium hydroaluminates, but no significant adsorption on ettringite and anhydrous phases such as C 3 S; moreover, it is found that the higher the capacity of CE adsorption, the stronger the retardation on cement hydration.…”

Section: Discussionmentioning

confidence: 99%

Influence of cellulose ethers on hydration products of portland cement

Jian

et al. 2011

J. Wuhan Univ. Technol.-Mat. Sci. Edit.

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Cellulose ethers are widely used to mortar formulations, and it is signifi cant to understand the interaction between cellulose ethers and cement pastes. FT-IR spectra, thermal analysis and SEM are used to investigate hydration products in the cement pastes modifi ed by HEMC and HPMC in this article. The results show that the hydration products in modifi ed cement pastes were fi nally identical with those in the unmodifi ed cement paste, but the major hydration products, such as CH (calcium hydroxide), ettringite and C-S-H, appeared later in the modifi ed cement pastes than in the unmodifi ed cement paste. The cellulose ethers decrease the outer products and increase inner products of C-S-H gels. Compared to unmodifi ed cement pastes, no new products are found in the modifi ed cement pastes in the present experiment. The HEMC and HPMC investigation shows almost the same infl uence on the hydration products of Portland cement.

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“…When natural polysaccharides such as starch or cellulose are used, they are thought to bond to minerals via hydrogen bonds (Liu et al 2000;Laskowski et al 2007). However, if functional groups are introduced into the polysaccharide structure, they can form chemical bonds with minerals.…”

Section: Effect Of Polysaccharide Type and Precipitation Processmentioning

confidence: 99%

The Effect of Carbonation Conditions on the Properties of Carbohydrate-Calcium Carbonate Hybrid Pigments

Kuusisto

Maloney

2015

BioResources

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The influence of two polysaccharides, native corn starch and carboxymethyl cellulose (CMC), on the precipitation of calcium carbonate was examined by utilizing two different carbonation processes. In a batch process, carbon dioxide gas was fed through calcium hydroxide slurry at pH 11.5 to 12.0. The reaction was complete when the pH had been decreased to 7. In a fed-batch reaction, the carbon dioxide was dissolved in water while calcium hydroxide was pumped into the water, maintaining a constant pH of 6.0±0.5. Scanning electron microscopy, particle size analysis, and specific surface area analysis were used to characterize the structure of the precipitated calcium carbonate (PCC) pigments. In application testing, the impact of modified pigments on paper properties was examined. The results showed that carbohydrates can significantly affect the crystallization of calcium carbonate, but the influence depends on the precipitation conditions and the type and concentration of the carbohydrate added. The starch-modified PCC, produced by the fed-batch reaction, improved the mechanical properties of the paper, whereas CMCmodified PCC yielded paper with good surface and optical performance but weakened strength properties.

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Current understanding of the mechanism of polysaccharide adsorption at the mineral/aqueous solution interface

Cited by 185 publications

References 24 publications

Flotation of Chalcopyrite and Molybdenite in the Presence of Organics in Water

Flotation of Chalcopyrite and Molybdenite in the Presence of Organics in Water

Influence of cellulose ethers on hydration products of portland cement

The Effect of Carbonation Conditions on the Properties of Carbohydrate-Calcium Carbonate Hybrid Pigments

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