Mechanical Modification of Naturally Occurring Limestone for High-Temperature CO2 Capture

详细信息    查看全文

• 作者：Jian Sun ; Wenqiang Liu ; Mingkui Li ; Xinwei Yang ; Wenyu Wang ; Yingchao Hu ; Hongqiang Chen ; Xian Li ; Minghou Xu
• 刊名：Energy & Fuels
• 出版年：2016
• 出版时间：August 18, 2016
• 年：2016
• 卷：30
• 期：8
• 页码：6597-6605
• 全文大小：657K
• 年卷期：0
• ISSN：1520-5029

文摘

The rapid decrease of CO₂ capture capacity is one of the most challenging problems hindering the use of naturally occurring limestone in the calcium looping process. In this work, the mechanical modification method (dry planetary ball milling) was used to improve the cyclic CO₂ capture performance of naturally occurring limestone. Low-cost Bayer aluminum hydroxide sourced from the industrial-scale production of alumina from bauxite ore was used as the precursor of the inert support to enhance the CO₂ sorption stability of the ball-milled sorbents. It was found that the CO₂ uptake of the milled sorbents could be further improved by increasing the ball-milling time because this generated more amounts of fine particles. Moreover, the pellets produced from ball-milled limestone powder possessed a relatively high CO₂ capture capacity of 0.252 g/g in the 25th cycle, which is nearly 1.3 times the capture capacity of naturally occurring limestone powder. This indicates that the combination of mechanical modification and pelletization is an effective approach to produce highly efficient CO₂ capture pellets from naturally occurring limestone.