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Reaction mechanism and kinetic analysis of the decomposition of phosphogypsum via a solid-state reaction / Liping Ma in Industrial & engineering chemistry research, Vol. 49 N° 8 (Avril 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 8 (Avril 2010) . - pp. 3597–3602 Titre : Reaction mechanism and kinetic analysis of the decomposition of phosphogypsum via a solid-state reaction Type de document : texte imprimé Auteurs : Liping Ma, Auteur ; Ping Ning, Auteur ; Shaocong Zheng, Auteur Année de publication : 2010 Article en page(s) : pp. 3597–3602 Note générale : Indusrrial Chemistry Langues : Anglais (eng) Mots-clés : Reaction  Mechanism  Kinetic  Analysis  Decomposition  Phosphogypsum  Solid-State Résumé : Phosphogypsum decomposition is very complex because of its complicated compounds. In this study, using high-sulfur-concentration coal as a reducer, thermogravimetric analysis, differential thermal analysis, scanning electron microscopy, and X-ray diffraction were used to characterize the decomposition process of phosphogypsum in a nitrogen atmosphere at different conditions. Mechanism analysis and experiment results showed that the amount of the intermediate production of CaS depended on the heating rate and the size of coal used, which was produced mainly through the reaction between CaSO4 and C, and production would decrease with an increase of the coal size. 60 mesh was a suitable size of coal for phosphogypsum decomposition to get high recovery of the main production of CaO. Using Kissinger, Flynn−Wall−Ozaw, and Coats−Redfem methods, the mechanism model of phosphogypsum decomposition was confirmed, the decomposition process belonged to the core-form and growing mechanism (n = 2), and the kinetic model was dα/dt = 1.6 × 1016e−475.99×103/RT × 2(1 − α)[−ln(1 − α)]1/2, where α is conversion. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901950y [article] Reaction mechanism and kinetic analysis of the decomposition of phosphogypsum via a solid-state reaction [texte imprimé] / Liping Ma, Auteur ; Ping Ning, Auteur ; Shaocong Zheng, Auteur . - 2010 . - pp. 3597–3602. Indusrrial Chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 8 (Avril 2010) . - pp. 3597–3602 Mots-clés : Reaction  Mechanism  Kinetic  Analysis  Decomposition  Phosphogypsum  Solid-State Résumé : Phosphogypsum decomposition is very complex because of its complicated compounds. In this study, using high-sulfur-concentration coal as a reducer, thermogravimetric analysis, differential thermal analysis, scanning electron microscopy, and X-ray diffraction were used to characterize the decomposition process of phosphogypsum in a nitrogen atmosphere at different conditions. Mechanism analysis and experiment results showed that the amount of the intermediate production of CaS depended on the heating rate and the size of coal used, which was produced mainly through the reaction between CaSO4 and C, and production would decrease with an increase of the coal size. 60 mesh was a suitable size of coal for phosphogypsum decomposition to get high recovery of the main production of CaO. Using Kissinger, Flynn−Wall−Ozaw, and Coats−Redfem methods, the mechanism model of phosphogypsum decomposition was confirmed, the decomposition process belonged to the core-form and growing mechanism (n = 2), and the kinetic model was dα/dt = 1.6 × 1016e−475.99×103/RT × 2(1 − α)[−ln(1 − α)]1/2, where α is conversion. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901950y