CPC B01D 53/73 (2013.01) [B01D 53/75 (2013.01); B01D 53/78 (2013.01); B01D 53/80 (2013.01); B01J 8/0015 (2013.01); C01B 33/128 (2013.01); B01D 2251/402 (2013.01); B01D 2257/504 (2013.01); B01J 2208/003 (2013.01); B01J 2208/00539 (2013.01)] | 13 Claims |
1. An integrated process for carbon dioxide capture, sequestration and utilisation, which comprises:
a) providing an aqueous slurry comprising an aqueous liquid and a particulate solid comprising an activated magnesium silicate mineral;
b) in a dissolution stage, contacting a CO2-containing gas stream with the aqueous slurry at a first pressure to dissolve magnesium from the mineral to provide a slurry comprising a magnesium ion enriched carbonated aqueous liquid and a magnesium depleted solid residue; and
c) in a precipitation stage, precipitating magnesium carbonate from magnesium ions dissolved in step b) by multiple successive stage-wise reductions in pressure, with each stage being at a lower pressure than the preceding stage;
wherein each successive stage-wise reduction in pressure releases CO2 which is correspondingly stage-wise compressed and recycled back into the dissolution stage.
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