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US 9,428,398 B2Granted
Process for preparing scalenohedral precipitated calcium carbonate
AssigneeOmya International AG
InventorsJoe Wenk, George Saunders, Marc Maurer, Mathieu Skrzypczak
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Abstract
The present invention provides a process for preparing a precipitated calcium carbonate product. The process comprises the steps of preparing slaking quick time to obtain slaked lime; and subjecting the slaked lime, without agitation, without prior cooling in a heat exchanger, and in the absence of any additives, to carbonation with carbon dioxide as to produce PCC. The newly prepared product develops better performance thanks to improved resistance during processing.
Claims21
A process for preparing precipitated calcium carbonate (PCC) comprising the steps of:
- (a) slaking quick lime to obtain slaked lime;
- (b) subjecting the slaked lime, without agitation, without prior cooling in a heat exchanger, and in the absence of any additives, to carbonation with carbon dioxide gas to produce PCC;
- and
- (c) subjecting the PCC obtained in step (b) to one or more screening, dewatering, dispersion and grinding steps to obtain a PCC product containing 85% or more scalenohedral particles.
1 more element
Dependencies are inferred from the claim text.