Process for producing nano precipitated calcium carbonate
AssigneeOmya International AG
InventorsLuis Pedroso, Holger Spiegel, Mathieu Skrzypczak
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Abstract
The present invention refers to a process for producing nano precipitated calcium carbonate (nano-PCC), as well as to the nano precipitated calcium carbonate (nano-PCC) obtained by such a process and a system for producing the nano precipitated calcium carbonate (nano-PCC) comprising at least one dry mill, preferably a dry sandmill. Furthermore, the present invention refers to the use of the nano precipitated calcium carbonate (nano-PCC) as well as to the use of the inventive system for producing nano precipitated calcium carbonate (nano-PCC).
Claims11
A process for producing nano precipitated calcium carbonate (nano-PCC) comprising the steps of:
- a) providing a calcium oxide containing material,
- b) providing water in an amount of up to 200 wt.-%, based on the total dry weight of the calcium oxide containing material,
- c) providing a carbon dioxide source,
- d) preparing nano-PCC in a crystal form as a particle of calcite by simultaneously carrying out the following steps (i) and (ii):
- (i) simultaneously mixing and milling the calcium oxide containing material of step a) with the water of step b), and
- (ii) adding under simultaneously mixing and milling the carbon dioxide source of step c) in an amount which corresponds to a mole ratio of the calcium oxide in the calcium oxide containing material of step a) to the carbon dioxide in the carbon dioxide source of step c) of 1:1 to 1:3.5.
Dependencies are inferred from the claim text.