Patent ID: 8012445

Claim:
A method for producing a calcium carbonate product in one or several sequential precipitation reactors, said method comprising: feeding carbon dioxide into a precipitation vessel of a precipitation reactor, feeding calcium hydroxide (Ca(OH) 2 ), or other corresponding Ca ++ ion source, into said precipitation vessel, maintaining a temperature in said precipitation vessel of less than 65° C., either a) by cooling said precipitation reactor by means of cooling elements, or b) by circulating a material which contains calcium carbonate, and/or a gas which contains carbon dioxide, to a cooler from said precipitation vessel and back to said precipitation vessel from said cooler, and precipitating calcium carbonate particles having a size of less than 100 nm in said precipitation vessel, wherein the calcium hydroxide, or other corresponding Ca ++ source, is fed to said precipitation vessel through a disintegration and spraying apparatus which is located inside said precipitation vessel, and wherein said disintegration and spraying apparatus operates on the principle of a pin mill.