427419 Limestone Modified By Carbon Additives to Enhance the Sequestration of CO2 in Cement Industry

Monday, November 9, 2015
Exhibit Hall 1 (Salt Palace Convention Center)
Binglu Meng1, Hui Li1, Wen-bin Yang2, Jiang-feng Li1, De-Long Xu2, Xinkai Hou1, Youhai Yu3 and Yong Min2, (1)Institute of Powder Engineering, Shaanxi Techno-Institute of Recycling Economy, Xian, China, (2)Xi'an University of Architecture and Technology, Xi'an, China, (3)Xi’an Institute of Optics and Precision Mechanics, Xi'an, China

Global warming caused by CO2 is a world problem and scientists have devoted themselves to the study of Carbon dioxide (CO2) capture and sequestration (CCS). CCCR technology (a Ca-based sorbents Cycling Calcination/ Carbonation Reaction technology) is a kind of new and effective method to capture CO2 in flue gas from industry. Limestone as a raw material in cement industry was used for sequestrating the CO2. But its efficiency was dramatically reduced after several cycles due to the “sintering” phenomena. Here we have provided a new method to enhance the CO2 sequestration ability of limestone by using small amount of carbon as an additive. carbon was used as skeleton at the early stage, then small pores were left and the specific area of limestone was increased when carbon was burned up. So the sintering was delayed and the calcination/carbonation rate was increased. A variety of carbon, such as carbon black, graphite, bamboo woods and coconut woods were studied. Our results show that coconut woods is the best carbon source and it has the performance of 13% increasment of efficiency with 2 wt% adding amount.

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See more of this Session: Poster Session: Environmental Division
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