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Experimental studies on phase transformation during pyrite concentrate oxidation under circulating fluidized bed (CFB) roasting conditions / Tao Wang in Industrial & engineering chemistry research, Vol. 50 N° 24 (Décembre 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 24 (Décembre 2011) . - pp. 14168-14174 Titre : Experimental studies on phase transformation during pyrite concentrate oxidation under circulating fluidized bed (CFB) roasting conditions Type de document : texte imprimé Auteurs : Tao Wang, Auteur ; Hai Zhang, Auteur ; Qing Liu, Auteur Année de publication : 2012 Article en page(s) : pp. 14168-14174 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Circulating  fluidized  bed  Fluidization  Oxidation  Phase  transformation Résumé : The phase transformation during pyrite concentrate oxidation under the conditions of the circulating fluidized bed (CFB) roasting process was experimentally studied at temperatures of 600-900 °C, O2 concentrations of 1%―21%, and particle residence times of ∼5.0 s in a drop tube furnace (DTF). The X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used to analyze the phase composition and microstructure of the product samples. For the roasting process with a short residence time, the products of pyrite concentrate oxidation are in a nonequilibrium phase. At higher O2 concentration and temperature, Fe3O4 is the dominant product phase. When O2 concentration increases, the micromorphology of sample products tends to be perfectly spherical particles with smooth surface, difficult for the formed Fe3O4 to be oxidized to Fe2O3. Experimental results indicated that, in the CFB roasting, relatively high temperature and low O2 concentration are needed to control the phase transformation into Fe2O3. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25299887 [article] Experimental studies on phase transformation during pyrite concentrate oxidation under circulating fluidized bed (CFB) roasting conditions [texte imprimé] / Tao Wang, Auteur ; Hai Zhang, Auteur ; Qing Liu, Auteur . - 2012 . - pp. 14168-14174. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 24 (Décembre 2011) . - pp. 14168-14174 Mots-clés : Circulating  fluidized  bed  Fluidization  Oxidation  Phase  transformation Résumé : The phase transformation during pyrite concentrate oxidation under the conditions of the circulating fluidized bed (CFB) roasting process was experimentally studied at temperatures of 600-900 °C, O2 concentrations of 1%―21%, and particle residence times of ∼5.0 s in a drop tube furnace (DTF). The X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used to analyze the phase composition and microstructure of the product samples. For the roasting process with a short residence time, the products of pyrite concentrate oxidation are in a nonequilibrium phase. At higher O2 concentration and temperature, Fe3O4 is the dominant product phase. When O2 concentration increases, the micromorphology of sample products tends to be perfectly spherical particles with smooth surface, difficult for the formed Fe3O4 to be oxidized to Fe2O3. Experimental results indicated that, in the CFB roasting, relatively high temperature and low O2 concentration are needed to control the phase transformation into Fe2O3. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25299887