US 11,833,469 B2
Multistage mineral carbonation
Emad Benhelal, Wallsend (AU); Geoffrey Frederick Brent, Valentine (AU); Eric Miles Kennedy, Newcastle (AU); Timothy Kenilworth Oliver, Adamstown Heights (AU); Mark Stuart Rayson, Bar Beach (AU); and Michael Stockenhuber, Bolwarra Heights (AU)
Assigned to Mineral Carbonation International Pty Ltd, Braddon (AU)
Appl. No. 17/053,013
Filed by Mineral Carbonation International Pty Ltd, Braddon (AU)
PCT Filed May 8, 2019, PCT No. PCT/AU2019/050424
§ 371(c)(1), (2) Date Nov. 4, 2020,
PCT Pub. No. WO2019/213705, PCT Pub. Date Nov. 14, 2019.
Claims priority of application No. 2018901560 (AU), filed on May 8, 2018.
Prior Publication US 2021/0370233 A1, Dec. 2, 2021
Int. Cl. B01D 53/80 (2006.01); B01D 53/62 (2006.01); B01D 53/73 (2006.01); B01D 53/75 (2006.01); B01D 53/78 (2006.01); B01J 8/00 (2006.01); C01F 5/24 (2006.01); C01B 33/12 (2006.01)
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
OG exemplary drawing
 
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.