US 11,697,597 B2
Integrated process for mineral carbonation
Emad Benhelal, Wallsend (AU); Geoffrey Frederick Brent, Valentine (AU); Eric Miles Kennedy, Newcastle (AU); Mark Stuart Rayson, Bar Beach (AU); and Michael Stockenhuber, Bolwarra Heights (AU)
Assigned to Mineral Carbonation International Pty Ltd, Canberra (AU)
Appl. No. 16/965,804
Filed by Mineral Carbonation International Pty Ltd, Braddon (AU)
PCT Filed Feb. 8, 2019, PCT No. PCT/AU2019/050098
§ 371(c)(1), (2) Date Jul. 29, 2020,
PCT Pub. No. WO2019/153047, PCT Pub. Date Aug. 15, 2019.
Claims priority of application No. 2018900382 (AU), filed on Feb. 8, 2018.
Prior Publication US 2021/0047197 A1, Feb. 18, 2021
Int. Cl. C01F 5/24 (2006.01); C01B 32/60 (2017.01); C01B 33/12 (2006.01); C01B 13/18 (2006.01); C01B 13/36 (2006.01); B01D 53/73 (2006.01); B01D 53/78 (2006.01); B01D 53/80 (2006.01); B01D 53/62 (2006.01); B01J 8/00 (2006.01)
CPC C01F 5/24 (2013.01) 18 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 solution 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 to dissolve magnesium from the activated magnesium silicate mineral to provide a magnesium ion enriched aqueous solution and a magnesium depleted solid residue;
c) recovering at least a portion of the magnesium depleted solid residue;
d) in a separate acid treatment stage, reacting the recovered portion of the magnesium depleted solid residue with a solution comprising a mineral acid or acid salt to further dissolve magnesium and other metals and to provide an acid-treated solid residue;
e) recovering silica from the acid-treated solid residue; and
f) in a separate precipitation stage, precipitating and recovering magnesium carbonate from the magnesium ion enriched aqueous solution.