Carbon dioxide sequestration by direct mineral carbonation: process mineralogy of feed and products

Conference · Sun Dec 31 23:00:00 EST 2000

OSTI ID:897114

O'Connor, William K; Dahlin, David C; Rush, G E; Dahlin, Cheryl L; Collins, W Keith

Direct mineral carbonation has been investigated as a process to convert gaseous CO2 into a geologically stable final form. The process utilizes a slurry of water, with bicarbonate and salt additions, mixed with a mineral reactant, such as olivine (Mg2SiO4) or serpentine [Mg3Si2O5(OH)4]. Carbon dioxide is dissolved into this slurry, resulting in dissolution of the mineral and precipitation of magnesium carbonate (MgCO3). Optimum results have been achieved using heat pretreated serpentine feed material and high partial pressure of CO2 (PCO2). Specific conditions include: 155?C; PCO2=185 atm; 15% solids. Under these conditions, 78% conversion of the silicate to the carbonate was achieved in 30 minutes. Process mineralogy has been utilized to characterize the feed and process products, and interpret the mineral dissolution and carbonate precipitation reaction paths.

• Research Organization: Albany Research Center (ARC), Albany, OR
• Sponsoring Organization: USDOE - Office of Fossil Energy (FE)
• OSTI ID: 897114
• Report Number(s): DOE/ARC-2001-027; CRADA 0966
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
42 ENGINEERING
54 ENVIRONMENTAL SCIENCES
58 GEOSCIENCES
ACID CARBONATES
CARBON DIOXIDE
CARBONATES
DISSOLUTION
MAGNESIUM CARBONATES
MINERALOGY
OLIVINE
PARTIAL PRESSURE
PRECIPITATION
SERPENTINE
SILICATES
WATER
carbon dioxide
mineral carbonation
sequestration