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Calculation for mineral phases in the calcination of desulfurization residue to produce sulfoaluminate cement / Wenlong Wang in Industrial & engineering chemistry research, Vol. 49 N° 19 (Octobre 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 19 (Octobre 2010) . - pp. 9504–9510 Titre : Calculation for mineral phases in the calcination of desulfurization residue to produce sulfoaluminate cement Type de document : texte imprimé Auteurs : Wenlong Wang, Auteur ; Peng Wang, Auteur ; Chunyuan Ma, Auteur Année de publication : 2010 Article en page(s) : pp. 9504–9510 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Flue  gas  desulfurization Résumé : The utilization of dry flue gas desulfurization (FGD) residue has become an environmental issue in China. A new method is introduced here to produce sulfoaluminate cement using the dry FGD residue and fly ash without modification of the cement plant equipments. The bench- and pilot-scale experimental studies indicated that the obtained sulfoaluminate cement product had excellent performance. FACTSAGE was improved by a new database and then used for raw material proportion optimization. The mineral phases of a CaO−SiO2−Al2O3−CaSO4 system after calcination were calculated. The theoretical and experimental results are accordant. This technology has good potential to decrease the raw material costs and energy consumption at cement plants. It is also beneficial in CO2 emission reduction and circular economy development. The calculation results may be generally referred in the studies on the chemical processes such as sulfur fixation at high temperature, mineral optimization, and cement production, etc. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie101228h [article] Calculation for mineral phases in the calcination of desulfurization residue to produce sulfoaluminate cement [texte imprimé] / Wenlong Wang, Auteur ; Peng Wang, Auteur ; Chunyuan Ma, Auteur . - 2010 . - pp. 9504–9510. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 19 (Octobre 2010) . - pp. 9504–9510 Mots-clés : Flue  gas  desulfurization Résumé : The utilization of dry flue gas desulfurization (FGD) residue has become an environmental issue in China. A new method is introduced here to produce sulfoaluminate cement using the dry FGD residue and fly ash without modification of the cement plant equipments. The bench- and pilot-scale experimental studies indicated that the obtained sulfoaluminate cement product had excellent performance. FACTSAGE was improved by a new database and then used for raw material proportion optimization. The mineral phases of a CaO−SiO2−Al2O3−CaSO4 system after calcination were calculated. The theoretical and experimental results are accordant. This technology has good potential to decrease the raw material costs and energy consumption at cement plants. It is also beneficial in CO2 emission reduction and circular economy development. The calculation results may be generally referred in the studies on the chemical processes such as sulfur fixation at high temperature, mineral optimization, and cement production, etc. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie101228h

CO2 Fixation in Ca2+-/Mg2+-rich aqueous solutions through enhanced carbonate precipitation / Wenlong Wang in Industrial & engineering chemistry research, Vol. 50 N° 13 (Juillet 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 13 (Juillet 2011) . - pp. 8333-8339 Titre : CO2 Fixation in Ca2+-/Mg2+-rich aqueous solutions through enhanced carbonate precipitation Type de document : texte imprimé Auteurs : Wenlong Wang, Auteur ; Mingqiang Hu, Auteur ; Yanli Zheng, Auteur Année de publication : 2011 Article en page(s) : pp. 8333-8339 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Aqueous  solution  Carbon  dioxide Résumé : In this work, the possibility of achieving fixation of CO2 using Ca and Mg ions was tested and verified Concentrated seawater from desalination plants, subsurface brines, industrial effluents with high hardness, and/or natural seawaters that are rich in Ca2+ and Mg2+ could all be potential aqueous sources. Theoretical analyses indicated that the carbonation reaction could be enhanced by raising the pH or the CO2 partial pressure. Experiments using synthesized seawater confirmed this possibility. Over 90% of the Ca2+ and Mg2+ ions in the seawater could be converted by precipitation in the forms of MgCO3 and dolomite [MgCa(CO3)2], and the kinetics of the process was found to be quite acceptable. It was found that 1 m3 of natural seawater could fix about 1.34 m3 or 2.65 kg of CO2 (gas volume, standard conditions), and the potential of concentrated seawater is 2-3 times this value. Even if the annual CO2 emissions of the entire world were captured in this way, the concentration of Ca2+/Mg2+ in natural seawater would change at only the part-per-million scale, such that the ecological effects could be negligible. This idea has great potential for application. It might be able to realize not only the permanent fixation of CO2 but also the production of large amounts of carbonate byproducts. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24332159 [article] CO2 Fixation in Ca2+-/Mg2+-rich aqueous solutions through enhanced carbonate precipitation [texte imprimé] / Wenlong Wang, Auteur ; Mingqiang Hu, Auteur ; Yanli Zheng, Auteur . - 2011 . - pp. 8333-8339. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 13 (Juillet 2011) . - pp. 8333-8339 Mots-clés : Aqueous  solution  Carbon  dioxide Résumé : In this work, the possibility of achieving fixation of CO2 using Ca and Mg ions was tested and verified Concentrated seawater from desalination plants, subsurface brines, industrial effluents with high hardness, and/or natural seawaters that are rich in Ca2+ and Mg2+ could all be potential aqueous sources. Theoretical analyses indicated that the carbonation reaction could be enhanced by raising the pH or the CO2 partial pressure. Experiments using synthesized seawater confirmed this possibility. Over 90% of the Ca2+ and Mg2+ ions in the seawater could be converted by precipitation in the forms of MgCO3 and dolomite [MgCa(CO3)2], and the kinetics of the process was found to be quite acceptable. It was found that 1 m3 of natural seawater could fix about 1.34 m3 or 2.65 kg of CO2 (gas volume, standard conditions), and the potential of concentrated seawater is 2-3 times this value. Even if the annual CO2 emissions of the entire world were captured in this way, the concentration of Ca2+/Mg2+ in natural seawater would change at only the part-per-million scale, such that the ecological effects could be negligible. This idea has great potential for application. It might be able to realize not only the permanent fixation of CO2 but also the production of large amounts of carbonate byproducts. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24332159

Recycling of waste printed circuit boards by microwave - induced pyrolysis and featured mechanical processing / Jing Sun in Industrial & engineering chemistry research, Vol. 50 N° 20 (Octobre 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 20 (Octobre 2011) . - pp. 11763–11769 Titre : Recycling of waste printed circuit boards by microwave - induced pyrolysis and featured mechanical processing Type de document : texte imprimé Auteurs : Jing Sun, Auteur ; Wenlong Wang, Auteur ; Zhen Liu, Auteur Année de publication : 2011 Article en page(s) : pp. 11763–11769 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Recycling  waste  Pyrolysis Résumé : The combination of microwave-induced pyrolysis and mechanical processing is a promising way to recycle the waste printed circuit boards (WPCBs). In pyrolysis, WPCBs yield an average of 78.6 wt.% solid residues, 15.7 wt.% oil, and 5.7 wt.% gas. The solid residues are rich in metals; the oil is abundant with phenol and substituted phenols which can be reclaimed as chemicals or fuels; and the gas is combustible with a caloric value of 4504 kcal/m3. Our featured mechanical processing, including crushing and specially designed sink-float separation, is very suitable for metal reclamation from the pyrolysis residues. Over 99 wt.% of metals can be dissociated by the crushing step; the final recycling rate and grade of metals in the separation step can amount to 95 wt.% and 96.5%, respectively. The economic assessment reveals that the combined treatment is amazingly profitable and very promising to tackle the challenges posed by the electronic scraps. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie2013407 [article] Recycling of waste printed circuit boards by microwave - induced pyrolysis and featured mechanical processing [texte imprimé] / Jing Sun, Auteur ; Wenlong Wang, Auteur ; Zhen Liu, Auteur . - 2011 . - pp. 11763–11769. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 20 (Octobre 2011) . - pp. 11763–11769 Mots-clés : Recycling  waste  Pyrolysis Résumé : The combination of microwave-induced pyrolysis and mechanical processing is a promising way to recycle the waste printed circuit boards (WPCBs). In pyrolysis, WPCBs yield an average of 78.6 wt.% solid residues, 15.7 wt.% oil, and 5.7 wt.% gas. The solid residues are rich in metals; the oil is abundant with phenol and substituted phenols which can be reclaimed as chemicals or fuels; and the gas is combustible with a caloric value of 4504 kcal/m3. Our featured mechanical processing, including crushing and specially designed sink-float separation, is very suitable for metal reclamation from the pyrolysis residues. Over 99 wt.% of metals can be dissociated by the crushing step; the final recycling rate and grade of metals in the separation step can amount to 95 wt.% and 96.5%, respectively. The economic assessment reveals that the combined treatment is amazingly profitable and very promising to tackle the challenges posed by the electronic scraps. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie2013407

Study on the effect of CO2 on the consumption of desulfurizing agent ca(OH)2 in flue gas desulfurization / Wenlong Wang in Industrial & engineering chemistry research, Vol. 49 N° 3 (Fevrier 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 3 (Fevrier 2010) . - pp. 1444–1449 Titre : Study on the effect of CO2 on the consumption of desulfurizing agent ca(OH)2 in flue gas desulfurization Type de document : texte imprimé Auteurs : Wenlong Wang, Auteur ; Mingqiang Hu, Auteur ; Yong Dong, Auteur Année de publication : 2010 Article en page(s) : pp. 1444–1449 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Study--Effect--CO2--Consumption--Desulfurizing--Ca(OH)2--Gas  Desulfurization Résumé : In view of the ambiguity concerning the effect of CO2 on the consumption of desulfurizing agent and based on our previous findings when studying flue gas desulfurization (FGD) byproduct, a specific study on the influence of CO2 has been carried out here with Ca(OH)2 being employed as a desulfurizing agent. This study is based on compositional analyses of the reaction products, and combined measurements have provided relatively precise compositions of the reaction products derived from Ca(OH)2 and flue gases. It has been found that the presence of CO2 does have an effect on the desulfurization reaction and on the consumption of desulfurizing agent when Ca(OH)2 is employed as the sorbent for SO2. Also, the formation of CaCO3 is inevitable at about 70 °C and is enhanced under conditions of high humidity. Although over 90% SO2 removal efficiency could be achieved with a relatively high Ca/S mole ratio, the effective utilization of desulfurizing agent would be low because CaCO3 is not the targeted product. Therefore, in order to improve semidry FGD technology, measures must be taken to prevent the reaction between CO2 and Ca(OH)2 so as to increase the utilization ratio of the desulfurizing agent. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901401j [article] Study on the effect of CO2 on the consumption of desulfurizing agent ca(OH)2 in flue gas desulfurization [texte imprimé] / Wenlong Wang, Auteur ; Mingqiang Hu, Auteur ; Yong Dong, Auteur . - 2010 . - pp. 1444–1449. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 3 (Fevrier 2010) . - pp. 1444–1449 Mots-clés : Study--Effect--CO2--Consumption--Desulfurizing--Ca(OH)2--Gas  Desulfurization Résumé : In view of the ambiguity concerning the effect of CO2 on the consumption of desulfurizing agent and based on our previous findings when studying flue gas desulfurization (FGD) byproduct, a specific study on the influence of CO2 has been carried out here with Ca(OH)2 being employed as a desulfurizing agent. This study is based on compositional analyses of the reaction products, and combined measurements have provided relatively precise compositions of the reaction products derived from Ca(OH)2 and flue gases. It has been found that the presence of CO2 does have an effect on the desulfurization reaction and on the consumption of desulfurizing agent when Ca(OH)2 is employed as the sorbent for SO2. Also, the formation of CaCO3 is inevitable at about 70 °C and is enhanced under conditions of high humidity. Although over 90% SO2 removal efficiency could be achieved with a relatively high Ca/S mole ratio, the effective utilization of desulfurizing agent would be low because CaCO3 is not the targeted product. Therefore, in order to improve semidry FGD technology, measures must be taken to prevent the reaction between CO2 and Ca(OH)2 so as to increase the utilization ratio of the desulfurizing agent. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901401j