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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

Preparation of 5 - fluorouracil / B - cyclodextrin complex intercalated in layered double hydroxide and the Controlled drug release properties / Lan Jin in Industrial & engineering chemistry research, Vol. 49 N° 22 (Novembre 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 22 (Novembre 2010) . - pp. 11176–11181 Titre : Preparation of 5 - fluorouracil / B - cyclodextrin complex intercalated in layered double hydroxide and the Controlled drug release properties Type de document : texte imprimé Auteurs : Lan Jin, Auteur ; Qing Liu, Auteur ; Zhiyong Sun, Auteur Année de publication : 2011 Article en page(s) : pp. 11176–11181 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Preparation  Fluorouracil  Cyclodextrin  Hydroxide Résumé : Hydrophobic anticancer drug 5-fluorouracil (5-FU) has been included in the carboxymethyl modified β-cyclodextrin (CMCD), and the inclusion complex (5-FU/CMCD) was further intercalated into galleries of a zinc aluminum layered double hydroxide (ZnAl-LDH) by the ion-exchange method. Powder X-ray diffraction (XRD), Fourier transform infrared (FT-IR), and UV-vis spectroscopy indicate a successful intercalation of 5-FU/CMCD into the LDH gallery. The release behavior of 5-FU from drug/CMCD-LDH composite at different pH values was studied. It was found that 5-FU was released faster in pH 7.2 than in the acidic mediums (pH 4.8), and the released amount was higher. The introduction of CMCD into the LDH matrix could prolong the drug release time in comparison to that from LDH without CMCD, which can be attributed to the inclusion of 5-FU by the CMCD cavity. Studies on mathematical modeling of drug release show that the release of 5-FU from the drug/CMCD-LDH composite follows the Korsmeyer-Peppas equation very well at different pH values. The drug/CMCD inclusion complex intercalated LDH composite in this work provides a supramolecular formulation for controlled release behavior, which can be potentially applied for nonionic and hydrophobic drugs. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100990z [article] Preparation of 5 - fluorouracil / B - cyclodextrin complex intercalated in layered double hydroxide and the Controlled drug release properties [texte imprimé] / Lan Jin, Auteur ; Qing Liu, Auteur ; Zhiyong Sun, Auteur . - 2011 . - pp. 11176–11181. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 22 (Novembre 2010) . - pp. 11176–11181 Mots-clés : Preparation  Fluorouracil  Cyclodextrin  Hydroxide Résumé : Hydrophobic anticancer drug 5-fluorouracil (5-FU) has been included in the carboxymethyl modified β-cyclodextrin (CMCD), and the inclusion complex (5-FU/CMCD) was further intercalated into galleries of a zinc aluminum layered double hydroxide (ZnAl-LDH) by the ion-exchange method. Powder X-ray diffraction (XRD), Fourier transform infrared (FT-IR), and UV-vis spectroscopy indicate a successful intercalation of 5-FU/CMCD into the LDH gallery. The release behavior of 5-FU from drug/CMCD-LDH composite at different pH values was studied. It was found that 5-FU was released faster in pH 7.2 than in the acidic mediums (pH 4.8), and the released amount was higher. The introduction of CMCD into the LDH matrix could prolong the drug release time in comparison to that from LDH without CMCD, which can be attributed to the inclusion of 5-FU by the CMCD cavity. Studies on mathematical modeling of drug release show that the release of 5-FU from the drug/CMCD-LDH composite follows the Korsmeyer-Peppas equation very well at different pH values. The drug/CMCD inclusion complex intercalated LDH composite in this work provides a supramolecular formulation for controlled release behavior, which can be potentially applied for nonionic and hydrophobic drugs. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100990z