Mineral carbonation, i.e., the conversion of CO2 into stable carbonates, is an attractive option for the sequestration of CO2 to reduce its emissions and mitigate global warming. We describe a preliminary process design and present experimental results for a subprocess of it, the dissolution of silicate minerals, which is believed to be the rate-limiting step of the aqueous mineral carbonation process. We have studied the dissolution behavior of the silicate olivine as function of pH and temperature at 90°C, 120°C and 150°C, and pH 2 to 10.4. Our results are in good agreement with extrapolations from literature data about low temperature experiments and confirm also the order of the pH the dependency for higher temperatures.
Kinetic study of silicate dissolution for the mineral carbonation process
Prigiobbe V.;Storti G.
2005
Abstract
Mineral carbonation, i.e., the conversion of CO2 into stable carbonates, is an attractive option for the sequestration of CO2 to reduce its emissions and mitigate global warming. We describe a preliminary process design and present experimental results for a subprocess of it, the dissolution of silicate minerals, which is believed to be the rate-limiting step of the aqueous mineral carbonation process. We have studied the dissolution behavior of the silicate olivine as function of pH and temperature at 90°C, 120°C and 150°C, and pH 2 to 10.4. Our results are in good agreement with extrapolations from literature data about low temperature experiments and confirm also the order of the pH the dependency for higher temperatures.
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