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Sökning: WFRF:(Kota Hanumantha Rao)

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1.
  • Abdel-Khalek, N.A., et al. (författare)
  • Effect of starch type on selectivity of cationic flotation of iron ore
  • 2012
  • Ingår i: Transactions of the Institution of Mining and Metallurgy Section C - Mineral Processing and Extractive Metallurgy. - 0371-9553 .- 1743-2855. ; 121:2, s. 98-102
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>Cationic flotation is one of the most widely accepted technologies for upgrading siliceous iron ore using polysaccharides (mainly starches) as depressing agents for iron bearing minerals while floating silica with amines. In this paper, a group of starches are investigated as depressants for haematite. These starches are wheat, corn, rice, potato and dextrin. The role of starch type on the selectivity of the separation process has been studied through zeta potential, adsorption measurements as well as flotation tests. The effects of type of starch and pH of the medium have been studied. The results indicate that the selectivity of the separation process is strongly affected by the type of starch used, where better results are obtained with corn starch or wheat starch in comparison to the other types. Fourier transform infrared spectroscopy measurements indicated that the interaction between starches and haematite surface is intermolecular interaction</p>
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2.
  • Alexandrova, L., et al. (författare)
  • The influence of mixed cationic-anionic surfactants on the three-phase contact parameters in silica-solution systems
  • 2011
  • Ingår i: Colloids and Surfaces A : Physicochemical and Engineering Aspects. - 0927-7757 .- 1873-4359. ; 373:1-3, s. 145-151
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>The formation of thin wetting films on silica surface from aqueous solution of a) tetradecyltrimetilammonium bromide (C14TAB) and (b) surfactant mixture of the cationic C14TAB with the anionic sodium alkyl- (straight chain C12-, C14- and C16-) sulfonates, was studied using the microscopic thin wetting film method developed by Platikanov. Film lifetimes, three-phase contact (TPC) expansion rates, receding contact angles and surface tension were measured. It was found that the mixed surfactants caused lower contact angles, lower rates of the thin aqueous film rupture and longer film lifetimes, as compared to the pure C14TAB. This behavior was explained by the strong initial adsorption of interfacial complexes from the mixed surfactant system at the air/solution interface, followed by adsorption at the silica interface. The formation of the interfacial complexes at the air/solution interface was proved by means of the surface tension data. It was also shown, that the chain length compatibility between the anionic and cationic surfactants controls the strength of the interfacial complex and causes synergistic lowering in the surface tension. The film rupture mechanism was explained by the heterocoagulation mechanism between the positively charged air/solution interface and the solution/silica interface, which remained negatively charged.</p>
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  • Ikumapayi, Fatai, et al. (författare)
  • Recycling of process water effect of calcium and sulphate ions in sulphides flotation
  • 2010
  • Ingår i: Conference in Minerals Engineering : Luleå, 2 -3 februari 2010. - Luleå : Luleå tekniska universitet. - 978-91-7439-097-1 ; s. 51-61
  • Konferensbidrag (övrigt vetenskapligt)abstract
    • <p>The effects of major components of calcium and sulphate ions in process water on sulphide mineral flotation has been investigated through Hallimond flotation of pure sulphide minerals using tapwater and water containing sulphate and calcium ions as well as through bench scale flotation of complex sulphide ores using tapwater and process water and with tapwater in the presence of calcium and sulphate ions. Hallimond flotation indicated activation of pyrite and slight depression of galena and chalcopyrite in the presence of high concentration of major species of calcium and sulphate ions using potassium amyl xanthate as collector. Bench scale flotation indicated activation of zinc when processwater was used and flotation in tapwater containing calcium and sulphate ions presented similar but not identical results.</p>
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9.
  • Ikumapayi, F, et al. (författare)
  • Recycling of process water in sulfides processing and flotation selectivity
  • 2010
  • Ingår i: XXV International Mineral Processing Congress : IMPC 2010, "Smarter processing for the future" : Brisbane, Australia 6-10 September 2010 : congress proceedings.. - Carlton, Vic : The Australian Institute of Mining and Metallurgy. - 9781921522284 ; s. 4079-4088
  • Konferensbidrag (refereegranskat)
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10.
  • Ikumapayi, Fatai, et al. (författare)
  • Recycling of process water in sulphide flotation : effect of calcium and sulphate ions on flotation of galena
  • 2012
  • Ingår i: Minerals Engineering. - 0892-6875 .- 1872-9444. ; 39, s. 77-88
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>The effects of major components of calcium and sulphate species present in recycled process water on galena flotation has been investigated through Hallimond flotation, zeta-potential, diffuse reflectance FTIR spectroscopy and XPS measurements using pure galena mineral. The significance of process water species in flotation has been understood using deionised water, process water and simulated tap water containing equivalent calcium and sulphate ions concentration as in process water.Hallimond flotation indicated marginally lower recoveries of galena in the presence of calcium and sulphate ions using potassium amyl xanthate as collector. Zeta-potential shows the adsorption of calcium ions whereby the potential are seen to increase while sulphate ions have no significant effect. FTIR and XPS studies revealed surface calcium carbonate and/or calcium sulphate species in process water which affected xanthate adsorption. Presence of surface oxidised species such as sulfoxy, hydroxyl species on galena at pH 10.5 in deionised and process water was also revealed.</p>
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  • Resultat 1-10 av 43
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