| 1. |
- Forsling, Willis, et al.
(författare)
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Use of surface complexation models in sulphide mineral flotation
- 1997
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Ingår i: International Journal of Mineral Processing. - 0301-7516 .- 1879-3525. ; 51:1-4, s. 81-95
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Tidskriftsartikel (refereegranskat)abstract
- Surface complexation modelling is introduced to investigate the surface reactions in a mixed galena and sphalerite flotation system. Computer-assisted calculations based on surface complexation modelling (SCM) are performed to obtain the mineral surface distribution of ethyl xanthate as well as carbonate and excess sulphide ions as a function of pH. The significance of pe is demonstrated by computing the mineral surface speciation in a flotation system with xanthate and excess of sulphide ions. The results are used to evaluate the influences of pH, pe, the concentration of xanthate, sulphide or carbonate ions to the mineral flotability. The flotation mechanisms in galena-sphalerite system are discussed based on SCM.
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| 2. |
- Gärd, Rune, et al.
(författare)
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FT-IR and FT-Raman studies of colloidal ZnS 1. : Acidic and alkaline sites at the ZnS/water interface
- 1995
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Ingår i: Journal of Colloid and Interface Science. - : Elsevier BV. - 0021-9797 .- 1095-7103. ; 169:2, s. 393-399
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Tidskriftsartikel (refereegranskat)abstract
- The surface complexes of colloidal ZnS have been studied using FT-IR and FT-Raman techniques. The absorption bands at 2500 and 1475-1375 cm-1, which are identified as the S-H bond and the Zn-OHCO2 entity, respectively, can be observed under varied conditions of sample stoichiometry and pH. The correlation between surface spectra and the complexation model is evaluated. The relation between the intensities of FT-IR and FT-Raman spectra and particle size is discussed.
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| 3. |
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| 4. |
- Sun, Zhong-Xi, et al.
(författare)
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Surface characteristics of magnetite in aqueous suspension
- 1998
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Ingår i: Journal of Colloid and Interface Science. - : Elsevier BV. - 0021-9797 .- 1095-7103. ; 197:1, s. 151-159
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Tidskriftsartikel (refereegranskat)abstract
- Surface characteristics of magnetite at 25°C in aqueous suspensions are systematically studied. The measured specific surface area and concentration of proton binding sites correspond well to the calculated values. Zeta potential of magnetite in the absence of multivalent cations exhibits positive values in acidic solution and becomes negative with increasing pH. pHpzcis about 6. In the presence of excess cations such as Fe2+or Fe3+, specific adsorption takes place at the surface of magnetite, which dramatically influences the value of zeta potential. The concentrations of soluble Fe ions at pH about 4.5 increase with solid concentrations of magnetite indicating some surface-related reaction mechanisms.
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