Experimental Determination of Ca-Silicate Dissolution Rates: A Source of Calcium for Geologic CO2
The international scientific community recognizes that greenhouse gases have the potential to influence climate, and that potential changes in sea level and weather patterns would be largely deleterious. Because CO{sub 2} is emitted in such large quantities and its atmospheric concentration has been consistently rising throughout the recent past, it is only prudent to focus attention on reducing its emission and on developing strategies for its removal from the atmosphere [1]. A variety of removal methods have been suggested ranging from deep-sea disposal, to recycling to methanol, and to conversion to solid carbonate [2]. Problems appear to remain with all these strategies, and more work is needed to develop an acceptable, efficient method or set of methods. The idea of converting the gas to solid carbonate is particularly appealing, because on a human time scale, this is permanent disposal. The reaction of CO{sub 2} and water with unstable silicate minerals to produce more stable silicates (e.g., clays) and solid carbonates is the natural weathering process which is a dominant part of the long-term global geochemical cycling process (e.g., [3]). The Earth's large deposits of limestone and dolomite (the two primary forms of carbonate rock) represent the Earth's natural response to volcanic CO{sub 2} emissions over much of planetary history. Recently, the suggestion was made to utilize the reaction of CO{sub 2} with silicate minerals that occurs naturally during chemical-weathering within deep sedimentary basins [4] or in aquifers [1] as a basis for removal.
- Research Organization:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 15013144
- Report Number(s):
- UCRL-JC-141059; TRN: US200604%%145
- Resource Relation:
- Conference: 1st National Conference on Carbon Sequestration, Washington, DC, May 14 - May 17, 2001
- Country of Publication:
- United States
- Language:
- English
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