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Experimental studies on decomposing properties of desulfurization gypsum in a thermogravimetric Analyzer and Multiatmosphere Fluidized Beds / Zhu, Miao in Industrial & engineering chemistry research, Vol. 51 N° 15 (Avril 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 15 (Avril 2012) . - pp. 5419–5423 Titre : Experimental studies on decomposing properties of desulfurization gypsum in a thermogravimetric Analyzer and Multiatmosphere Fluidized Beds Type de document : texte imprimé Auteurs : Zhu, Miao, Auteur ; Hairui Yang, Auteur ; Yuxin Wu, Auteur Année de publication : 2012 Article en page(s) : pp. 5419–5423 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Gas  Desulfurization  Thermogravimetric  analyzer Résumé : This paper proposes a new technical process to utilize flue gas desulfurization (FGD) gypsum in fluidized beds. Gypsum is stable in the inert atmosphere and instable in the reducing atmosphere. Decomposing properties of gypsum in multiatmospheres were investigated in both a thermogravimetric analyzer (TGA) and a fluidized bed reactor. Results from the TGA showed that the initial decomposing temperatures of gypsum in all reducing atmospheres are about 800 °C; however, the ratio between CaS and CaO in the product is influenced by CO concentration ([CO]). Higher [CO] is beneficial to speeding the decomposition. The analysis of mass spectrometer showed that part of CaS was oxidized to CaO when the atmosphere was changed from the reducing one with [CO] = 2% to the oxidizing one with O2 concentration of 0.6%, which was proved by the XRD analysis of the final product with content of CaO of 91.6%. Fluidized bed experiments were done in a hot, lab scale, bubbling reactor. Results showed that CO2 can increase the CaO content in the product by restraining the side production of CaS significantly. After gypsum decomposition in the reducing atmosphere, a certain amount of air was injected to change the atmosphere to oxidizing, and more SO2 was released. The present research proves that a multistage fluidized bed system with multiatmospheres is feasible for gypsum decomposition. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie300092s [article] Experimental studies on decomposing properties of desulfurization gypsum in a thermogravimetric Analyzer and Multiatmosphere Fluidized Beds [texte imprimé] / Zhu, Miao, Auteur ; Hairui Yang, Auteur ; Yuxin Wu, Auteur . - 2012 . - pp. 5419–5423. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 15 (Avril 2012) . - pp. 5419–5423 Mots-clés : Gas  Desulfurization  Thermogravimetric  analyzer Résumé : This paper proposes a new technical process to utilize flue gas desulfurization (FGD) gypsum in fluidized beds. Gypsum is stable in the inert atmosphere and instable in the reducing atmosphere. Decomposing properties of gypsum in multiatmospheres were investigated in both a thermogravimetric analyzer (TGA) and a fluidized bed reactor. Results from the TGA showed that the initial decomposing temperatures of gypsum in all reducing atmospheres are about 800 °C; however, the ratio between CaS and CaO in the product is influenced by CO concentration ([CO]). Higher [CO] is beneficial to speeding the decomposition. The analysis of mass spectrometer showed that part of CaS was oxidized to CaO when the atmosphere was changed from the reducing one with [CO] = 2% to the oxidizing one with O2 concentration of 0.6%, which was proved by the XRD analysis of the final product with content of CaO of 91.6%. Fluidized bed experiments were done in a hot, lab scale, bubbling reactor. Results showed that CO2 can increase the CaO content in the product by restraining the side production of CaS significantly. After gypsum decomposition in the reducing atmosphere, a certain amount of air was injected to change the atmosphere to oxidizing, and more SO2 was released. The present research proves that a multistage fluidized bed system with multiatmospheres is feasible for gypsum decomposition. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie300092s