Documents disponibles écrits par cet auteur

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

Thermodynamic modeling and gaseous pollution prediction of the yellow phosphorus production / Zhonghua Wang in Industrial & engineering chemistry research, Vol. 50 N° 21 (Novembre 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 21 (Novembre 2011) . - pp. 12194-12202 Titre : Thermodynamic modeling and gaseous pollution prediction of the yellow phosphorus production Type de document : texte imprimé Auteurs : Zhonghua Wang, Auteur ; Ming Jiang, Auteur ; Ping Ning, Auteur Année de publication : 2011 Article en page(s) : pp. 12194-12202 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Production  Prediction  Pollution  Modeling Résumé : Thermodynamic modeling of the yellow phosphorus production is carried out to understand the producing mechanism of the tail gas, to predict its most probable composition, and to realize its deep purification and multipurpose utilization. The model is based on the typical raw materials composition and the common industrial process parameters of the electric furnace method, using FactSage6.1 and its database package. The predicted relative productivity between yellow phosphorus and byproduct is consistent with the reported values. Furthermore, the main composition of the tail gas can be obtained if kinetic inhibition is taken into account. The thus calculated equilibrium amounts of CO, H2S, and HF and the total amount of As are in good agreement with the results measured in the field, whereas those of PH3, COS, and CS2 are higher. This method of modeling can be used in the gaseous pollution prediction of other industrial chemical processes occurring at high temperatures. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24697537 [article] Thermodynamic modeling and gaseous pollution prediction of the yellow phosphorus production [texte imprimé] / Zhonghua Wang, Auteur ; Ming Jiang, Auteur ; Ping Ning, Auteur . - 2011 . - pp. 12194-12202. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 21 (Novembre 2011) . - pp. 12194-12202 Mots-clés : Production  Prediction  Pollution  Modeling Résumé : Thermodynamic modeling of the yellow phosphorus production is carried out to understand the producing mechanism of the tail gas, to predict its most probable composition, and to realize its deep purification and multipurpose utilization. The model is based on the typical raw materials composition and the common industrial process parameters of the electric furnace method, using FactSage6.1 and its database package. The predicted relative productivity between yellow phosphorus and byproduct is consistent with the reported values. Furthermore, the main composition of the tail gas can be obtained if kinetic inhibition is taken into account. The thus calculated equilibrium amounts of CO, H2S, and HF and the total amount of As are in good agreement with the results measured in the field, whereas those of PH3, COS, and CS2 are higher. This method of modeling can be used in the gaseous pollution prediction of other industrial chemical processes occurring at high temperatures. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24697537