Patent ID: 6251356
Filing Date: 2001-06-26
Classification: C01F,C01P,D21H

Abstract:
A method for the production of precipitated calcium carbonate, said method comprising:(a) providing a source of calcium ions;(b) mixing said source of calcium ions with a solvent to create a slurry, said slurry comprising (i) an undissolved portion of said source of calcium ions, and (ii) a solution comprising calcium ions;(c) feeding said slurry to a reactor;(d) bubbling a gas stream comprising carbon dioxide through said slurry while maintaining said reactor at a pressure above atmospheric pressure, to produce carbonate ions from said carbon dioxide, and then reacting said carbonate ions with said calcium ions to form a calcium carbonate precipitate;(e) agitating the contents of said reactor,(f) wherein the acts of creation of said slurry and reaction of said slurry are performed sequentially, and(g) wherein the time required for the act of reacting said slurry is approximately the same as the time required for act of creating said slurry.