Carbon dioxide sequestration by ex-situ mineral carbonation
The process developed for carbon dioxide sequestration utilizes a slurry of water mixed with olivine- forsterite end member (Mg{sub 2}SiO{sub 4}), which is reacted with supercritical CO{sub 2} to produce magnesite (MgCO{sub 3}). Carbon dioxide is dissolved in water to form carbonic acid, which likely dissociates to H{sup +} and HCO{sub 3}{sup -}. The H{sup +} hydrolyzes the silicate mineral, freeing the cation (Mg{sup 2+}), which reacts with the HCO{sub 3}{sup -} to form the solid carbonate. Results of the baseline tests, conducted on ground products of the natural mineral, have demonstrated that the kinetics of the reaction are slow at ambient temperature (22 degrees C) and subcritical CO{sub 2} pressures (below 7.4 MPa). However, at elevated temperature and pressure, coupled with continuous stirring of the slurry and gas dispersion within the water column, significant conversion to the carbonate occurs. Extent of reaction is roughly 90% within 24 h, at 185 degrees C and partial pressure of CO{sub 2} (P{sub CO{sub 2}}) of 11.6 MPa. Current studies suggest that reaction kinetics can be improved by pretreatment of the mineral, catalysis of the reaction, and/or solution modification. Subsequent tests are intended to examine these options, as well as other mineral groups.
- Research Organization:
- Albany Research Center (ARC), Albany, OR (United States)
- Sponsoring Organization:
- USDOE - Office of Fossil Energy (FE)
- OSTI ID:
- 875354
- Report Number(s):
- DOE/ARC-1999-009; TRN: US200603%%95
- Resource Relation:
- Conference: Second International Dixy Lee Ray Memorial Symposium, Washington, DC, Aug. 29 - Sept. 2, 1999
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
58 GEOSCIENCES
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
AMBIENT TEMPERATURE
CARBON DIOXIDE
CARBONATES
CARBONIC ACID
CATALYSIS
CATIONS
KINETICS
OLIVINE
PARTIAL PRESSURE
REACTION KINETICS
SILICATE MINERALS
STIRRING
WATER
carbon dioxide sequestration
mineral carbonation