Health & Environmental Research Online (HERO)


Print Feedback Export to File
7477056 
Journal Article 
Reverse cationic flotation of iron ores - floatability of amphiboles at depression of iron oxides by starch 
Filippov, L; Filippova, I; Severov, V 
2010 
3 
1869-1878 
English 
The phenomenon specific affinity of iron minerals for starch has been successfully exploited in the selective flocculation and flotation of iron ores. Therefore, the same phenomenon complicates the flotation separation between iron oxides and Fe-Al-bearing silicates. FT-IR spectroscopy revealed that starch adsorbs onto surface of quartz and Fe-Al-bearing amphiboles. Interaction of starch with these minerals is discussed in terms of adsorption mechanisms. This paper presents the results of flotation studies using the mixture of amines and non-ionic surfactants (eg alcohols) to increase the rate of quartz and Fe-Al-bearing amphiboles removal from iron concentrate with starch used as depressor for iron oxides. The experimental results with starch obtained in a laboratory impeller type cell have shown that the recovery of quartz decreased two-fold with dodecylamine acetate. The recovery values have been slightly modified with use of medium-chain ether amine acetate or ether diamine acetate. With addition of starch, total suppression of the floatability of amphibole in the presence of dodecylamine acetate has been observed. The flotation recovery of amphibole was below 30 per cent even with ether amine acetate or ether diamine acetate. This confirms that starch has specific interactions with the surface of Fe-Al-bearing amphibole. It has been shown that a relatively good flotation recovery of Fe-Al-bearing amphiboles can be obtained with adding a nonionic surfactant in mineral-amine system. The structure of additive's molecule and molar ratio of amine/additive mixture play crucial role in flotation efficiency. The most significant effect has been observed when the mixture of ether diamine acetate and iso-alcohol is used at the ratio 1:2. 
Alcohols; Amphiboles; Ether amines; Flotation; Iron ores; Adsorption mechanism; Dodecyl amines; Floatability; Flotation efficiency; Flotation recovery; Flotation separation; FTIR spectroscopy; Iron concentrates; Iron minerals; Molar ratio; Selective flocculation; Specific interaction; Aluminum; Flocculation; Iron oxides; Mixtures; Molecular biology; Nonionic surfactants; Recovery; Silicate minerals; Volatile fatty acids