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US 12,630,438 B2Granted
Process for producing precipitated calcium carbonate in the presence of natural ground calcium carbonate
AssigneeOmya International AG
InventorsLuis Pedroso, Aaro Salonen, Marc Maurer
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Abstract
The present invention relates to a process for producing an aqueous suspension of precipitated calcium carbonate, an aqueous suspension of precipitated calcium carbonate obtainable by the process, a precipitated calcium carbonate obtainable by the process, a product comprising the precipitated calcium carbonate as well as the use of the natural ground calcium carbonate (NGCC) in a process for producing an aqueous suspension of precipitated calcium carbonate.
Claims19
A process for producing an aqueous suspension of precipitated calcium carbonate, the process comprising the steps of:
- i) providing a calcium oxide containing material,
- ii) providing a natural ground calcium carbonate (NGCC) as precipitation additive, wherein the natural ground calcium carbonate (NGCC) has a weight median diameter d50 of at least 0.3 μm,
- iii) preparing a milk of lime by mixing water, the calcium oxide containing material of step i), and the natural ground calcium carbonate (NGCC) of step ii), wherein the natural ground calcium carbonate (NGCC) is present in an amount ranging from >5 to 25 wt.-%, based on the total weight of the calcium oxide containing material,
- iv) carbonating the milk of lime obtained from step iii) to form an aqueous suspension of precipitated calcium carbonate.
1 more element
Dependencies are inferred from the claim text.