The effect of molecular weight on the adsorption and efficacy of polysaccharide depressants

McFadzean, B.; Dicks, P.; Groenmeyer, Gary V.; Harris, Peter; O’Connor, C.T.

doi:10.1016/j.mineng.2010.12.015

Cited by 21 publications

(7 citation statements)

References 12 publications

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“…In industry, guar gum is the most widely used depressant for hydrophobic gangue minerals. However, it still has drawbacks such as high cost and limited availability [5,8,13,14]. To identify more economical depressants, attempts have been made by researchers to investigate new depressants such as galactomannan and foenum-graecum that are easier to obtain, have a high depression selectivity for magnesium silicates and little depression effect on nickel minerals [5,15].…”

Section: Introductionmentioning

confidence: 99%

Flotation and Adsorption of a New Polysaccharide Depressant on Pyrite and Talc in the Presence of a Pre-Adsorbed Xanthate Collector

Deng

Tian

et al. 2017

Minerals

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Abstract:The flotation and adsorption of a new polysaccharide konjac gum (KG) on pyrite and talc in the presence of pre-adsorbed potassium butyl xanthate (PBX) is investigated. The micro-flotation results show that KG is a quality depressant for talc and that conditioning the minerals initially with PBX before KG will increase the recovery difference between pyrite and talc. The results of artificially mixing the minerals show that compared with adding KG before PBX, when minerals are pre-adsorbed with PBX, the grade and the recovery of sulfur (S) increases by 1.96% and 5.44%, respectively. The contact angle results show that the addition of PBX before KG will increase the contact angles of pyrite, but the addition order of KG/PBX has little influence on the contact angles of talc. The adsorption tests show that KG can adsorb on pyrite and talc surfaces, while PBX can only adsorb on the pyrite surface. The addition order of KG/PBX affects the adsorption of KG and PBX on the pyrite surface but not on the talc surface. Fourier transform infrared (FTIR) spectra analysis further demonstrates the chemical adsorption of KG on pyrite and talc surfaces, while PBX chemisorbs on the pyrite surface. Based on these analyses, a schematic illustration of the reagent adsorption forms on pyrite and talc surfaces is drawn to explain the competitive adsorption of KG and PBX on mineral surfaces.

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Section: Introductionmentioning

confidence: 99%

Flotation and Adsorption of a New Polysaccharide Depressant on Pyrite and Talc in the Presence of a Pre-Adsorbed Xanthate Collector

Deng

Tian

et al. 2017

Minerals

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“…A lot of studies have been carried out on the adsorption behavior of polymers between minerals such as starch and quartz, talc, hematite, chalcopyrite, manganese dioxide, and colloidal chromium(III) oxide . Various effects, such as those on the particle size, background ions, and temperature, were investigated in those studies .…”

Section: Introductionmentioning

confidence: 99%

Adsorption of new hydrophobic polyacrylamide on the calcite surface

Wang

et al. 2017

J of Applied Polymer Sci

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A hydrophobic polyacrylamide (HPAM) was synthesized by aqueous free-radical chain polymerization to understand the adsorption action of the polymer on the calcite during operating stimulation. The polymer was designed as acrylamide (AM)/2-acrylamide-2-methylpropanesulfonic acid (AMPS)/2-methacryloyloxyethyl 12-alkyl dimethyl ammonium bromide (MADA). The structure of the polymer was characterized by Fourier transform infrared spectroscopy. The adsorption properties of the polyacrylamide onto pure calcite was investigated. When we compared the f potentials of the calcite particles in the presence and absence of HPAM, the adsorbed amount was affected by different factors, and the adsorption behaviors were examined to determine the adsorption layer. The results of the f potential measurements indicated that the particles were negatively charged between pHs of 6 and 12, and the presence of HPAM did not reverse that. Equilibrium adsorption studies showed that the adsorbed amount was affected by the concentration of HPAM, liquid-to-solid ratio, calcite particle size, concentration of background ions, and temperature, which were related the adsorption behaviors of HPAM. Hydrogen bonds between HPAM and calcite were important because the adsorbed amount was significantly reduced when the hydrogen bonds were broken by urea. It is necessary to develop a more active reagent that can break the hydrogen bonds and improve the effect of hydraulic fracturing.

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“…Polysaccharide polymers [21][22][23][24] are a hot topic in mineral processing due to their efficiency and degradability as the depressants for the flotation of sulfide ores [25][26][27]. In recent years, there were many reports on the relations between the depression effect of macromolecular depressants and molecular weight (MW), i.e., low molecular weight (LMW: 1 kDa ≤ MW < 50 kDa), medium molecular weight (MMW: 50 kDa ≤ MW < 500 kDa), and high molecular weight (HMW: 500 kDa ≤ MW < 1000 kDa) [28][29][30][31]. These studies showed that MMW-macromolecule depressants can selectively depress the mixed-mineral systems through competitive adsorption.…”

Section: Introductionmentioning

confidence: 99%

Selective Flotation of Pyrite from Galena Using Chitosan with Different Molecular Weights

Zhang

Sun

et al. 2019

Minerals

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Pyrite is a major gangue mineral associated with galena and other valuable minerals, and it is necessary to selectively remove pyrite to upgrade the lead concentrate by froth flotation. In this study, the flotation experiments of a single mineral and mixed minerals were performed using chitosan with different molecular weights (MW = 2−3, 3−6, 10 and 100 kDa) as a depressant, ethyl xanthate as a collector, and terpineol as a frother, in a bid to testify the separation of pyrite from galena. Flotation results showed that the selective flotation of pyrite from galena can be achieved under the preferred reagent scheme, i.e., 400 g/t chitosan (10 kDa), 1600 g/t ethyl xanthate, and 100 g/t terpineol, while chitosan with other molecular weights cannot. Furthermore, the results of the zeta potential and contact angle measurements revealed that chitosan (10 kDa) has a strong adsorption on galena yet a very weak adsorption on pyrite at the dosage of 400 g/t. This study showed that chitosan (10 kDa) has great potential in the industrial flotation separation of pyrite from lead concentrates.

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The effect of molecular weight on the adsorption and efficacy of polysaccharide depressants

Cited by 21 publications

References 12 publications

Flotation and Adsorption of a New Polysaccharide Depressant on Pyrite and Talc in the Presence of a Pre-Adsorbed Xanthate Collector

Flotation and Adsorption of a New Polysaccharide Depressant on Pyrite and Talc in the Presence of a Pre-Adsorbed Xanthate Collector

Adsorption of new hydrophobic polyacrylamide on the calcite surface

Selective Flotation of Pyrite from Galena Using Chitosan with Different Molecular Weights

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