Patent ID: 8496897

Claim:
A carbon dioxide sequestration process including the steps of: (i) providing a slurry comprising metal silicate rock; (ii) in a first stage, mixing the slurry of metal silicate rock with ammonia so as to produce an ammonia/water/metal silicate slurry; (iii) in a second stage, scrubbing a gas stream containing carbon dioxide with the slurry from (ii) to thereby absorb the carbon dioxide into the slurry so as to form a reactive slurry; (iv) in a third stage, passing the reactive slurry from (iii) through a reactor that is controlled so as to promote a reaction between the carbon dioxide and the metal silicate and produce a metal carbonate; and (v) recovering ammonia resulting from the reaction stage (iv) and recycling it to the first stage wherein the ammonia recovery is effected in a recovery vessel which is pressurized to facilitate the recovery of ammonia in liquid form.