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Title: Carbon dioxide sequestration by aqueous mineral carbonation of magnesium silicate minerals

The dramatic increase in atmospheric carbon dioxide since the Industrial Revolution has caused concerns about global warming. Fossil-fuel-fired power plants contribute approximately one third of the total human-caused emissions of carbon dioxide. Increased efficiency of these power plants will have a large impact on carbon dioxide emissions, but additional measures will be needed to slow or stop the projected increase in the concentration of atmospheric carbon dioxide. By accelerating the naturally occurring carbonation of magnesium silicate minerals it is possible to sequester carbon dioxide in the geologically stable mineral magnesite (MgCO3). The carbonation of two classes of magnesium silicate minerals, olivine (Mg2SiO4) and serpentine (Mg3Si2O5(OH)4), was investigated in an aqueous process. The slow natural geologic process that converts both of these minerals to magnesite can be accelerated by increasing the surface area, increasing the activity of carbon dioxide in the solution, introducing imperfections into the crystal lattice by high-energy attrition grinding, and in the case of serpentine, by thermally activating the mineral by removing the chemically bound water. The effect of temperature is complex because it affects both the solubility of carbon dioxide and the rate of mineral dissolution in opposing fashions. Thus an optimum temperature for carbonation of olivinemore » is approximately 185 degrees C and 155 degrees C for serpentine. This paper will elucidate the interaction of these variables and use kinetic studies to propose a process for the sequestration of the carbon dioxide.« less
Authors:
; ; ;
Publication Date:
OSTI Identifier:
898299
Report Number(s):
DOE/ARC-2003-018
TRN: US200703%%419
Resource Type:
Conference
Resource Relation:
Conference: 2nd Annual Conference on Carbon Sequestration, Alexandria, VA, May 5-8, 2003; Related Information: In PDF table of contents, title is shown as "Accelerating the Rate of Mineral Carbonation"
Publisher:
Exchange Monitor Publications & Forums, Washington, DC
Research Org:
Albany Research Center (ARC), Albany, OR
Sponsoring Org:
USDOE - Office of Fossil Energy (FE)
Country of Publication:
United States
Language:
English
Subject:
20 FOSSIL-FUELED POWER PLANTS; 58 GEOSCIENCES; CARBON DIOXIDE; CARBON SEQUESTRATION; CRYSTAL LATTICES; DEFECTS; DISSOLUTION; EFFICIENCY; GREENHOUSE EFFECT; GRINDING; KINETICS; MAGNESIUM SILICATES; OLIVINE; POWER PLANTS; SERPENTINE; SOLUBILITY; SURFACE AREA; WATER carbon dioxide; sequestration; global warming; magnesium silicate; fossil fuel power plants