Carbon Dioxide Sequestration by Mechanochemical Carbonation of Mineral Silicates

Nelson, Michael G.

University of Utah

关键词: Synthetic Materials;    X-Ray Diffraction;    Carbon Dioxide;    Processing;    36 Materials Science;   

DOI  :  10.2172/826304
RP-ID  :  NONE
RP-ID  :  FG26-02NT41547
RP-ID  :  826304

美国|英语

来源: UNT Digital Library

【 摘 要 】

The University of Utah and the University of Idaho investigated the carbonation of silicate minerals by mechanochemical processing. This method uses intense grinding, and has the potential of being much less expensive than other methods of mineral sequestration. Tests were conducted in three types of grinding devices. In these tests, natural and synthetic silicate compounds were ground for varying times in the presence of gaseous CO{sub 2}. A significant change takes place in the lizardite variety of serpentine after 15 to 20 minutes of intense grinding in the presence of gaseous CO{sub 2}. The X-ray diffraction spectrum of lizardite thus treated was much different than that of the untreated mineral. This spectrum could not be identified as that of any natural or synthetic material. Laboratory analyses showed that small amounts of carbon are fixed by grinding lizardite, forsterite, and wollastonite (all naturally-occurring minerals), and synthetic magnesium silicate, in the presence of gaseous CO{sub 2}. It was thus concluded that further investigation was warranted, and a follow-up proposal was submitted to the Department of Energy under solicitation number.