Carbonate Aggregate Compositions and Methods of Making and Using the Same
Methods of making carbonate aggregates are provided. Aspects of the methods include: preparing a carbonate slurry, subjecting the carbonate slurry to rotational action, e.g., by introducing the carbonate slurry (optionally with an aggregate substrate) into a revolving drum under conditions sufficient to produce a carbonate aggregate, e.g., made up of a spherical coating on a substrate and/or agglomeration particles. Also provided are aggregate compositions produced by the methods, as well as compositions that includes the carbonate coated aggregates, e.g., concretes, and uses thereof.
1 . A method of producing a carbonate aggregate, the method comprising:
preparing a carbonate slurry; and
subjecting the carbonate slurry to rotational action under conditions sufficient to produce a carbonate aggregate product.
2 . The method according to claim 1 , wherein the carbonate slurry is a slurry of metal carbonate particles.
3 . The method according to claim 2 , wherein the metal carbonate particles are calcium carbonate particles.
4 . The method according to claim 3 , wherein the metal carbonate particles are calcium magnesium carbonate particles.
5 . The method according to claims 1 to 4 , wherein the carbonate particles comprise sequestered CO 2 .
6 . The method according to any of claims 1 to 5 , wherein the carbonate slurry comprises 40 to 60% solids.
7 . The method according to any of claims 1 to 6 , wherein the slurry has a viscosity ranging from 2 to 300,000 centipoise.
8 . The method according to any of claims 1 to 7 , wherein the carbonate slurry is prepared using a CO 2 sequestering process.
9 . The method according to claim 8 , wherein the CO 2 sequestering process comprises:
a) contacting an aqueous capture liquid with a gaseous source of CO 2 under conditions sufficient to produce an aqueous carbonate; and then combining a cation source and the aqueous carbonate under conditions sufficient to produce a CO 2 sequestering carbonate precipitate; or
b) contacting an aqueous ammonia capture liquid that includes a cation source with the gaseous source of CO 2 under conditions sufficient to produce the CO 2 sequestering carbonate.
10 . The method according to claim 9 , wherein the aqueous capture liquid comprises an aqueous capture ammonia and optionally an additive.
11 . The method according to any of claims 9 to 10 , wherein the method comprises washing the precipitate.
12 . The method according to any of claims 1 to 11 , wherein the carbonate slurry is subjected to the rotational action in combination with an aggregate substrate and the carbonate aggregate product comprises carbonate coated aggregate.
13 . A carbonate coated aggregate composition produced according to any of claims 1 to 12 .
14 . A concrete dry composite comprising:
(a) a cement; and
(b) an aggregate composition according to claim 13 .
15 . A settable composition produced by combining an aggregate according to claim 13 , a cement and a liquid.