Energy Consumption and Net CO 2 Sequestration of Aqueous Mineral Carbonation
Year: 2006
Type: article
Abstract: Aqueous mineral carbonation is a potentially attractive sequestration technology to reduce CO 2 emissions. The energy consumption of this technology, however, reduces the net amount of CO 2 sequestered. Therefore, the energetic CO 2 sequestration efficiency of aqueous mineral carbonation was studied in dependence of various process variables using either wollastonite (CaSiO 3 ) or steel slag as feedstock. For wollastonite, the maximum energetic CO 2 sequestration efficiency within the ranges of process conditions studied was 75% at 200 °C, 20 bar CO 2, and a particle size of <38 μm. The main energy-consuming process steps were the grinding of the feedstock and the compression of the CO 2 feed. At these process conditions, a significantly lower efficiency was determined for steel slag (69%), mainly because of the lower Ca content of the feedstock. The CO 2 sequestration efficiency might be improved substantially for both types of feedstock by, e.g., reducing the amount of process water applied and further grinding of the feedstock. The calculated energetic efficiencies warrant a further assessment of the (energetic) feasibility of CO 2 sequestration by aqueous mineral carbonation on the basis of a pilot-scale process.
DOI: 10.1021/ie060636k
Language: English
Subfield: Environmental Engineering
Field: Environmental Science
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2140026551