Process for preparing scalenohedral precipitated calcium carbonate

摘要

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.

主权项

1. 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.