Floatability of Fe-bearing silicates in the presence of starch: Adsorption and spectroscopic studies To cite this article: V V Severov et al 2013 J. Phys.: Conf. Ser. 416 012017 View the article online for updates and enhancements. Related content Role of the carbonate impurities on the surface state of pyrite and arsenopyrite under treatment by high power electromagnetic pulses (HPEMP): oxidation of 50-100 m size particles I Filippova, V Chanturiya, L Filippov et al. -Effect of ultrasound on

more »

... otation kinetics in the reactor-separator L O Filippov, A S Matinin, V D Samiguin et al. -Biosorption of model pollutants in liquid phase on raw and modified rice husks L Toniazzo, V Fierro, F Braghiroli et al. -Recent citations An overview of the beneficiation of iron ores via reverse cationic flotation L.O. Filippov et al -This content was downloaded from IP address 207.241.231.80 on 23/07/2018 at 15:44 Floatability of Fe-bearing silicates in the presence of starch: Adsorption and spectroscopic studies Abstract. Natural polysaccharides such as starch, dextrin, cellulose and their derivatives are promising non-toxic and biodegradable organic flocculants and flotation depressants. This paper presents the investigation of mechanism of adsorption of corn starch on quartz and Febearing amphibole, i.e. pargasite. The direct measurement of starch adsorption on the mineral surfaces shows no difference between quartz and pargasite. However, the starch adsorption on the magnetite is more important. FT-IR spectroscopy studies reports different adsorption mechanism of starch on quartz and pargasite surface. The key changes observed in starch absorption on quartz are the major shifts in С-О stretching frequencies presumed existence of a hydrogen bond between starch and quartz surface. The similar changes were observed in this region of IR-band for pargasite. The appearance and disappearance of the bands in the region 960-920 cm -1 corresponds probably to formation of a new chemical bond between starch О-Н groups and metal atoms on pargasite surface with formation of a surface complex. This result confirms that adsorption of the starch on the pargasite surface is droved by two mechanism. Hence, existence of strong chemical bond between starch and pargasite surface explains decrease of its floatability compared to quartz in process of iron ore flotation and forces to search new conditioning reagent modes.