Patent ID: 6761869
Filing Date: 2004-07-13
Classification: C01F

Abstract:
A process for the preparation of precipitated calcium carbonate comprisingburning a calcium carbonate containing starting material in order to form calcium oxide, forming calcium carbonate of the calcium oxide in the presence of water and carbonate ions, and recovering the calcium carbonate wherein the calcium oxide is carbonated in a carbonating apparatus in a turbulence zone with carbon dioxide gas in the presence of water vapour, water droplets or mist fed into the carbonating apparatus via a water vapour/water inlet, or the calcium oxide is causticized in a caustacizing apparatus in a turbulence zone with a solution of an alkali metal or ammonium carbonate present in the form of a liquid mist containing finely divided droplets fed into the apparatus via an inlet, in order to convert the calcium oxide into calcium carbonate, wherein said process takes 3 to 60 seconds.