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]  inIndustrial & 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

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Hydrodynamic characteristics of dual- impeller configurations in a multiple-phase stirred tank / Tao Wang in Industrial & engineering chemistry research, Vol. 49 N° 3 (Fevrier 2010)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 49 N° 3 (Fevrier 2010) . - pp. 1001–1009 Titre : Hydrodynamic characteristics of dual- impeller configurations in a multiple-phase stirred tank Type de document : texte imprimé Auteurs : Tao Wang, Auteur ; Gengzhi Yu, Auteur ; Yumei Yong, Auteur Année de publication : 2010 Article en page(s) : pp. 1001–1009 Note générale : Industrial Chemistry Langues : Anglais (eng) Mots-clés : Hydrodynamic--Dual-Impeller--Configurations--Multiple--Tank Résumé : Experiments are carried out in a baffled flat-bottom stirred tank to test five dual-impeller configurations, including a new type of impeller, alternate blade disk turbine (ABDT). Power consumptions in gas−liquid, liquid−solid, and gas−liquid−solid systems are determined by the shaft-torque method. It is found that the configuration with an axial impeller consumes less energy than that with a radial one in all multiple-phase systems. The correlations between power input and gas flow rate or solid concentration are also discussed. Power number reaches a limit with the increase of Reynolds number in liquid−solid systems. Aeration is proved to be harmful to solid suspension. Mixing time and solid particle concentration are measured by the electric conductivity method and Powder Voidmeter PC-6, respectively. The mixing modes (axial and radial) are proposed in the light of impeller types and flow patterns. The experimental results show that the mixing time of the double radial impeller configuration is the shortest, while the double axial impeller combination performs worst. Judging from the axial solid particle concentration distribution and overall suspension uniformity, the combination taking pitched blade turbine downflow (PBTD) as the lower impeller achieves the best solid suspension. Note de contenu : Bibiogr. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9006886 [article] Hydrodynamic characteristics of dual- impeller configurations in a multiple-phase stirred tank [texte imprimé] / Tao Wang, Auteur ; Gengzhi Yu, Auteur ; Yumei Yong, Auteur . - 2010 . - pp. 1001–1009. Industrial Chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 3 (Fevrier 2010) . - pp. 1001–1009 Mots-clés : Hydrodynamic--Dual-Impeller--Configurations--Multiple--Tank Résumé : Experiments are carried out in a baffled flat-bottom stirred tank to test five dual-impeller configurations, including a new type of impeller, alternate blade disk turbine (ABDT). Power consumptions in gas−liquid, liquid−solid, and gas−liquid−solid systems are determined by the shaft-torque method. It is found that the configuration with an axial impeller consumes less energy than that with a radial one in all multiple-phase systems. The correlations between power input and gas flow rate or solid concentration are also discussed. Power number reaches a limit with the increase of Reynolds number in liquid−solid systems. Aeration is proved to be harmful to solid suspension. Mixing time and solid particle concentration are measured by the electric conductivity method and Powder Voidmeter PC-6, respectively. The mixing modes (axial and radial) are proposed in the light of impeller types and flow patterns. The experimental results show that the mixing time of the double radial impeller configuration is the shortest, while the double axial impeller combination performs worst. Judging from the axial solid particle concentration distribution and overall suspension uniformity, the combination taking pitched blade turbine downflow (PBTD) as the lower impeller achieves the best solid suspension. Note de contenu : Bibiogr. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9006886

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Numerical characteristics of peer-to-peer (P2P) internet online hybrid test system and its application to seismic simulation of SRC structure / Tao Wang in Earthquake engineering structural dynamics, Vol. 37 N°2 (Fevrier 2008)  

Public ISBD [article]  inEarthquake engineering structural dynamics > Vol. 37 N°2 (Fevrier 2008) . - 265 - 282 p. Titre : Numerical characteristics of peer-to-peer (P2P) internet online hybrid test system and its application to seismic simulation of SRC structure Type de document : texte imprimé Auteurs : Tao Wang, Auteur ; Yoshitake, Nobuya, Auteur ; Pan, Peng, Auteur ; Lee, Tae-Hyung, Auteur ; Nakashima, Masayoshi, Auteur Année de publication : 2008 Article en page(s) : 265 - 282 p. Note générale : Génie civil Langues : Anglais (eng) Mots-clés : P2P Internet online hybrid test stability Finite element method Steel-encased reinforced concrete (SRC Quasi-static loading Chargement quasistatique Essai hybride en ligne d'Internet de Stabilité Méthode d'élément finie Béton armé Acier-emballé (SRC) Index. décimale : 624.151 Résumé : The peer-to-peer (P2P) Internet online hybrid test system has been developed for the seismic simulation of a structure. In this study, the stability and accuracy of the system are investigated analytically by studying the spectral radius of the recursive matrix of the test scheme featuring a two-round quasi-Newton test scheme. The applicability of the system is further examined by exploring the seismic responses of a complex structure, a steel-encased reinforced concrete (SRC) structure with a steel tower on the top. The structure is divided into two numerical substructures and one tested part for hybrid test. The numerical substructures are simulated by sophisticated finite element method (FEM) models with material nonlinearities to capture local plastifications. Two types of FEM programs, namely OpenSEES and ABAQUS, which are suitable for the SRC part and the steel tower, respectively, are employed. The results demonstrate that the P2P system is able to simulate complex structures with significant nonlinearities. As compared with the previous study in which two elastic numerical substructures were considered, increase in the number of iterations in this study is not significant, because the associated nonlinearities are limited due to the small time interval adopted in the test. Le système hybride en ligne d'essai d'Internet du pair-à-pair (P2P) a été développé pour la simulation séismique d'une structure. Dans cette étude, la stabilité et l'exactitude du système sont étudiées analytiquement en étudiant le rayon spectral de la matrice récursive de l'arrangement d'essai comportant un arrangement quasi-newtonien deux-rond d'essai. L'applicabilité du système plus plus loin est examinée en explorant les réponses séismiques d'une structure complexe, une structure (SRC) en béton renforcée acier-emballée avec une tour en acier sur le dessus. La structure est divisée en deux sous-structures numériques et une part examinée pour l'essai hybride. Les sous-structures numériques sont simulées par les modèles sophistiqués de la méthode d'élément fini (FEM) avec des non-linéarités matérielles pour capturer des plastifications locaux. Deux types de programmes de FEM, à savoir OpenSEES et ABAQUS, qui conviennent à la pièce de SRC et à la tour en acier, respectivement, sont utilisés. Les résultats démontrent que le système de P2P peut simuler les structures complexes avec des non-linéarités significatives. Par rapport à l'étude précédente dans laquelle deux sous-structures numériques élastiques ont été considérées, l'augmentation du nombre d'itérations dans cette étude n'est pas significative, parce que les non-linéarités associées sont dues limité au petit intervalle de temps adopté dans l'essai. DEWEY : 551.2 ISSN : 0098-8847 RAMEAU : Elément fini -- Béton armé -- Acier En ligne : http://www3.interscience.wiley.com/journal [article] Numerical characteristics of peer-to-peer (P2P) internet online hybrid test system and its application to seismic simulation of SRC structure [texte imprimé] / Tao Wang, Auteur ; Yoshitake, Nobuya, Auteur ; Pan, Peng, Auteur ; Lee, Tae-Hyung, Auteur ; Nakashima, Masayoshi, Auteur . - 2008 . - 265 - 282 p. Génie civil Langues : Anglais (eng) in Earthquake engineering structural dynamics > Vol. 37 N°2 (Fevrier 2008) . - 265 - 282 p. Mots-clés : P2P Internet online hybrid test stability Finite element method Steel-encased reinforced concrete (SRC Quasi-static loading Chargement quasistatique Essai hybride en ligne d'Internet de Stabilité Méthode d'élément finie Béton armé Acier-emballé (SRC) Index. décimale : 624.151 Résumé : The peer-to-peer (P2P) Internet online hybrid test system has been developed for the seismic simulation of a structure. In this study, the stability and accuracy of the system are investigated analytically by studying the spectral radius of the recursive matrix of the test scheme featuring a two-round quasi-Newton test scheme. The applicability of the system is further examined by exploring the seismic responses of a complex structure, a steel-encased reinforced concrete (SRC) structure with a steel tower on the top. The structure is divided into two numerical substructures and one tested part for hybrid test. The numerical substructures are simulated by sophisticated finite element method (FEM) models with material nonlinearities to capture local plastifications. Two types of FEM programs, namely OpenSEES and ABAQUS, which are suitable for the SRC part and the steel tower, respectively, are employed. The results demonstrate that the P2P system is able to simulate complex structures with significant nonlinearities. As compared with the previous study in which two elastic numerical substructures were considered, increase in the number of iterations in this study is not significant, because the associated nonlinearities are limited due to the small time interval adopted in the test. Le système hybride en ligne d'essai d'Internet du pair-à-pair (P2P) a été développé pour la simulation séismique d'une structure. Dans cette étude, la stabilité et l'exactitude du système sont étudiées analytiquement en étudiant le rayon spectral de la matrice récursive de l'arrangement d'essai comportant un arrangement quasi-newtonien deux-rond d'essai. L'applicabilité du système plus plus loin est examinée en explorant les réponses séismiques d'une structure complexe, une structure (SRC) en béton renforcée acier-emballée avec une tour en acier sur le dessus. La structure est divisée en deux sous-structures numériques et une part examinée pour l'essai hybride. Les sous-structures numériques sont simulées par les modèles sophistiqués de la méthode d'élément fini (FEM) avec des non-linéarités matérielles pour capturer des plastifications locaux. Deux types de programmes de FEM, à savoir OpenSEES et ABAQUS, qui conviennent à la pièce de SRC et à la tour en acier, respectivement, sont utilisés. Les résultats démontrent que le système de P2P peut simuler les structures complexes avec des non-linéarités significatives. Par rapport à l'étude précédente dans laquelle deux sous-structures numériques élastiques ont été considérées, l'augmentation du nombre d'itérations dans cette étude n'est pas significative, parce que les non-linéarités associées sont dues limité au petit intervalle de temps adopté dans l'essai. DEWEY : 551.2 ISSN : 0098-8847 RAMEAU : Elément fini -- Béton armé -- Acier En ligne : http://www3.interscience.wiley.com/journal

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UV-curable epoxy silicone with a high refractive index and self-photosensitizing effect / Tao Wang in Industrial & engineering chemistry research, Vol. 51 N° 49 (Décembre 2012)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 51 N° 49 (Décembre 2012) . - pp. 15832-15838 Titre : UV-curable epoxy silicone with a high refractive index and self-photosensitizing effect Type de document : texte imprimé Auteurs : Tao Wang, Auteur ; Hui Ye, Auteur ; Xianshun Zhang, Auteur Année de publication : 2013 Article en page(s) : pp. 15832-15838 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Ultraviolet radiation Résumé : The present work addresses a demand for cationically UV-curable optically transparent monomers and oligomers with high photopolymerization activity and high refractive indexes (RIs). Two novel kinds of epoxy silicones, carbazole-bound epoxy tetramethylcyclotetrasiloxane (Ep-Cz-Si) and carbazole-bound epoxy methylhydrogen silicone oil (Ep-Cz-SiO), were synthesized from 1,3,5,7-tetramethylcyclotetrasiloxane (D4H) and methylhydrogen silicone oil (HHSiO), respectively. Their structures were confirmed by proton nuclear magnetic resonance (1H NMR) and Fourier transform infrared (FT-IR) spectroscopy. Ep-Cz-Si and Ep-Cz-SiO show strong self-photosensitizing effects in photopolymerization and can be photoinitiated directly by a common onium salt photoinitiator under a high-pressure mercury lamp. The RIs of Ep-Cz-Si and Ep-Cz-SiO improve with increasing carbazole content. The photocured networks from Ep-Cz-Si and Ep-Cz-SiO show good thermal stabilities. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26732108 [article] UV-curable epoxy silicone with a high refractive index and self-photosensitizing effect [texte imprimé] / Tao Wang, Auteur ; Hui Ye, Auteur ; Xianshun Zhang, Auteur . - 2013 . - pp. 15832-15838. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 49 (Décembre 2012) . - pp. 15832-15838 Mots-clés : Ultraviolet radiation Résumé : The present work addresses a demand for cationically UV-curable optically transparent monomers and oligomers with high photopolymerization activity and high refractive indexes (RIs). Two novel kinds of epoxy silicones, carbazole-bound epoxy tetramethylcyclotetrasiloxane (Ep-Cz-Si) and carbazole-bound epoxy methylhydrogen silicone oil (Ep-Cz-SiO), were synthesized from 1,3,5,7-tetramethylcyclotetrasiloxane (D4H) and methylhydrogen silicone oil (HHSiO), respectively. Their structures were confirmed by proton nuclear magnetic resonance (1H NMR) and Fourier transform infrared (FT-IR) spectroscopy. Ep-Cz-Si and Ep-Cz-SiO show strong self-photosensitizing effects in photopolymerization and can be photoinitiated directly by a common onium salt photoinitiator under a high-pressure mercury lamp. The RIs of Ep-Cz-Si and Ep-Cz-SiO improve with increasing carbazole content. The photocured networks from Ep-Cz-Si and Ep-Cz-SiO show good thermal stabilities. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26732108

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