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ECN publication
Aqueous mineral carbonation as a possible CO2 sequestration process: energetic efficiency and costs
Published by: Publication date:
ECN Biomass, Coal and Environmental Research 1-4-2006
ECN report number: Document type:
ECN-RX--06-069 Conference Paper
Number of pages: Full text:
12 Download PDF  

Presented at: 8th International Conference on GreenHouse Gas Control Technologies (GHGT-8), Trondheim, Norway, 19-22 juni 2006.

Aqueous mineral carbonation is a potentially attractive sequestration technology to reduce CO2 emissions. In this paper, the energy consumption and costs of this technology were assessed using either wollastonite (CaSiO3) or steel slag as feedstock. The major energy-consuming process steps were found to be the grinding of the feedstock and the compression of the CO2. Within ranges of experimentally investigated process conditions, optimum energetic CO2 sequestration efficiencies were 79 and 74% for wollastonite and steel slag, respectively. It was shown that the energetic performance for both feedstock might be improved up to >90% by e.g. further grinding of the feedstock and reducing the amount of process water applied. At energetically optimized process conditions, a preliminary cost estimate was made of 93 and 66 €/ton CO2 avoided for wollastonite and steel slag, respectively (sequestration costs excluding possible capture). For wollastonite, major costs were associated with the feedstock and the electricity consumption (51 and 20 €/ton CO2 avoided, respectively). A sensitivity analysis showed that additional influential parameters with regard to the sequestration costs include the liquid-to-solid ratio applied in the carbonation reactor and the possible commercial value of the carbonated product.

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