Document Detail


Sequestering CO(2) by mineral carbonation: stability against acid rain exposure.
MedLine Citation:
PMID:  20199068     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Mineral carbonation is a potentially attractive alternative to storage of compressed CO(2) in underground repositories, known as geosequestration. Processes for the conversion of basic ores, such as magnesium silicates, to carbonates have been proposed by various researchers, with storage of the carbonate as backfill in the original mine representing a solid carbon sink. The stability of such carbon sinks against acid rain and other sources of strong acids is examined here. It is acknowledged that in the presence of strong acid, carbonates will dissolve and release carbon dioxide. A sensitivity analysis covering annual average rainfall and pH that may be encountered in industrialized areas of the United States, China, Europe, and Australia was conducted to determine maximum CO(2) rerelease rates from mineral carbonation carbon sinks. This analysis is based on a worst-case premise that is equivalent to assuming infinitely rapid kinetics of dissolution of the carbonate. The analysis shows that under any likely conditions of pH and rainfall, leakage rates of stored CO(2) are negligible. This is illustrated in a hypothetical case study under Australian conditions. It is thus proposed that sequestration by mineral carbonation can be considered to be permanent on practical human time scales. Other possible sources of acid have also been considered.
Authors:
Daniel J Allen; Geoff F Brent
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Environmental science & technology     Volume:  44     ISSN:  0013-936X     ISO Abbreviation:  Environ. Sci. Technol.     Publication Date:  2010 Apr 
Date Detail:
Created Date:  2010-03-30     Completed Date:  2010-06-07     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0213155     Medline TA:  Environ Sci Technol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  2735-9     Citation Subset:  IM    
Affiliation:
Orica Pty. Ltd., New South Wales, Australia. Daniel.allen@orica.com
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MeSH Terms
Descriptor/Qualifier:
Acid Rain / analysis*
Australia
Carbon Dioxide / isolation & purification*
Carbonates / chemistry*
Magnesium / chemistry
Minerals / chemistry*
Silicic Acid / chemistry
Water / chemistry
Chemical
Reg. No./Substance:
0/Acid Rain; 0/Carbonates; 0/Minerals; 124-38-9/Carbon Dioxide; 1343-98-2/Silicic Acid; 546-93-0/magnesium carbonate; 7439-95-4/Magnesium; 7732-18-5/Water

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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