Effect of aqueous phase properties on clay particle zeta potential and electro-osmotic permeability: Implications for electro-kinetic soil remediation processes

Vane, Leland M.; Zang, Gwen M.

doi:10.1016/s0304-3894(97)00010-1

Cited by 210 publications

(59 citation statements)

References 26 publications

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“…It indicated that the negative value for the kaolinite system when pH higher than 3.1 due to the net negative surface charge on kaolinite surface. This is agreed with the measurement in other literatures (Arnold and Aplan, 1986;Vane and Zang, 1997 The electrostatic attraction between gangue and valuable minerals has been reported to attribute to slime coatings. It has been well documented that clay slime coatings occur on galena, coal and bitumen surfaces through the electrostatic attraction, reduce surface hydrophobicity and then depress the flotation significantly (Arnold and Aplan, 1986b;Edwards et al, 1980).…”

Section: Slime Coatings On Valuable Minerals In Flotationsupporting

confidence: 92%

“…With increasing pH, the zeta potential was decreased slightly. This is in line with the measurement in literature (Arnold and Aplan, 1986;Vane and Zang, 1997). As discussed previously, the basal faces of clay minerals carry a constant negative charge (Luckham and Rossi, 1999;Zhao et al, 2008).…”

Section: 0×10 6 Fig 53 Normalized Xps Cu 2p Spectra Of the Ground supporting

confidence: 92%

“…The iso-electric point of the oxidized sulphide minerals is therefore increased and lie between that of elemental sulfur and that of the corresponding metal hydroxide species. The zeta potential of clay minerals is negative in alkaline solutions (Arnold,B.J., 1986;Vane,L.M., 1997). At pH 9.0, both the faces and edges of bentonite are negatively charged (Sondi,I., 1997;Rand,B., 1980;Lagaly,G., 1993).…”

Section: Discussionmentioning

confidence: 99%

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Slime coating mitigation on mineral surfaces in froth flotation by saline water

Zhao¹

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Fine and ultra-fine particle flotation is central to the mining industry as a result of the need to treat low grade and difficult ores which require fine grinding to liberate valuable minerals from gangue minerals. However, the flotation of fine and ultra-fine particles is not efficient and a slime coating with slime gangue particles attaching to valuable minerals is one of the most popular barriers. A slime coating prevents the adsorption of collectors on the surface of valuable minerals resulting in low flotation recovery or low product quality.Saline water is also an important issue in the mining industry. In Western Australia, bore water with a high ionic strength has to be used at mine sites for production, site rehabilitation, and downstream processing because fresh water is not available locally. In Queensland, most mine sites have adopted water re-use as a means for making freshwater savings. However, water re-use results in increased salinity in site water stores, which is driven largely by evaporation and ongoing salt inputs from spoil, minerals and groundwater. Flotation relies on a large amount of water and therefore the impact of saline water on flotation performance has gained more and more attention.In this research, the role of saline water in the mitigation of slime coatings was studied and a generic approach to improve fine and ultra-fine particle flotation by using saline water was developed, building on the previous research. A model slime coating system was established by using copper minerals in the presence of clay particles. It was found that chalcocite flotation was depressed in the presence of bentonite slimes while chalcopyrite flotation was less affected.Electrostatic interactions between copper minerals and clay particles were found to be responsible for the different flotation of chalcocite and chalcopyrite in the presence of clay minerals. It was found that surface oxidation occurred during II grinding and changed the surface properties of chalcopyrite and chalcocite.Chalcocite was strongly oxidized while chalcopyrite was slightly oxidized after the grinding with stainless steel media. The different extent of surface oxidation resulted in the different electrical property of chalcocite and chalcopyrite surfaces.The strongly oxidized chalcocite surface became positively charged after grinding at the same pH and electrostatically attractive to bentonite particles resulting in the depressed chalcocite flotation. In contrast, the slightly oxidized chalcopyrite surface remained negatively charged after grinding at pH 9.0 and entropically repulsive from bentonite slime particles. Therefore, bentonite slimes did not influence chalcopyrite flotation as much as chalcocite flotation.Mitigation of slime coatings on chalcocite in flotation by using electrolytes was further investigated and kaolinite was used to introduce the slime. The results indicated that in tap water, the presence of kaolinite slimes depressed chalcocite flotation. With the addition of electrolytes to the flotation...

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Section: Slime Coatings On Valuable Minerals In Flotationsupporting

confidence: 92%

Section: 0×10 6 Fig 53 Normalized Xps Cu 2p Spectra Of the Ground supporting

confidence: 92%

Section: Discussionmentioning

confidence: 99%

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Slime coating mitigation on mineral surfaces in froth flotation by saline water

Zhao¹

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“…In cationic polyacrylamide, the decrease in zeta potential of shale with polymer adsorption is due either to a decrease in charge density or a shift in the shear plane. The zeta potential also decreases more rapidly when the double layer is compressed at high ionic strength (Brooks and Seaman 1973;Vane and Zang 1997). The hydrophilic ends of the cationic polyacrylamide attached themselves to the positively charged edges of clay particles and cause bridging of clay particles.…”

Section: Characterizing Polymer-shale Interaction Through Zeta Potentmentioning

confidence: 99%

“…The zeta potential is an electric potential developed at the solidliquid interface due to the relative movement of solid particles in water (Vane and Zang 1997). Zeta potential at the solid-liquid interface is an indirect measure of solidliquid interactions (Menon and Wasan 1987b;Werner et al 2001;Petersen and Saykally 2008).…”

Section: Introductionmentioning

confidence: 99%

Quantitative characterization of polyacrylamide–shale interaction under various saline conditions

et al. 2017

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Interaction of polymer-containing injected fluids with shale is a widely studied phenomenon, but much is still unknown about the interaction of charged polyacrylamides such as anionic and cationic polyacrylamides with shale. The nature of interaction of charged polyacrylamides with shale is not well understood, especially from the perspective of assessing the potential for polyacrylamides to cause formation damage. Zeta potential and rheological measurements were made for Chattanooga and Pride Mountain shales suspended in polyacrylamide solutions with and without inorganic salts and tetramethyl ammonium chloride (TMAC). The change in zeta potential and viscosity with time was recorded. The magnitude of decrease in the absolute value of zeta potential with time is indicative of adsorption of polymer on the surface of shale and serves as a measure of the extent of polymer interaction with shale. The salts that were used in this study are potassium chloride (KCl), sodium chloride (NaCl). This study quantified the interaction of anionic and cationic polyacrylamide with different North American shales. From the experimental results, it was determined that the polyacrylamides can interact strongly with shale, particularly the cationic polyacrylamide. The objective of this study was to determine the extent of interaction of anionic and cationic polyacrylamide with each shale sample in the presence of additives such as salts.

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