427171 The Enhancement of CO2 Sequestration of Limestone By Modified with Attapulgite

Monday, November 9, 2015
Exhibit Hall 1 (Salt Palace Convention Center)
Liyuan Shan1, Hui Li1, Jingjing Meng1, Binglu Meng1, 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

Limestone can be used for Carbon dioxide (CO2) capture and sequestration (CCS) in flue gas effectively. However, its CCS capability will dramatically decline after several cycles due to the surface “sintering”. In order to improve the efficiency of recirculated CaO, here we modified the limestone with attapulgite, a natural mineral with nano-fibrous structure. Attapulgite can reduce the sintering phenomenon between the limestone particles, thus can improve the carbonation rate of Limestone during the CCS process. The experimental results shown that, the limestone modified with both natural attapulgite and purified attapulgite can improve the carbonation rate, and purified attapulgite showed better result. The morphology change of limestone with the modification of attapulgite was studied by SEM. We found that after the modification with attapulgite, the absorbent’s porous surface will be kept and the surface sintering was postponed. As a consequence, the carbonation rate was increased by 13.11% with the adding of 5wt% attapulgite.

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See more of this Session: Poster Session: Environmental Division
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