PRODUCTION OF HIGH PURITY PRECIPITATED CALCIUM CARBONATE

摘要

The present invention relates to a process for the preparation of precipitated calcium carbonate comprising the steps of a) providing and calcining calcium carbonate comprising material; b) slaking the reaction product obtained from step a) with an aqueous ammonium chloride solution; c) separating insoluble components from the calcium chloride solution obtained from step b); d) carbonating the calcium chloride solution obtained from step c); e) separating the precipitated calcium carbonate obtained from step d); the precipitated calcium carbonate obtained by this process, as well as uses thereof.

主权项

1. Precipitated calcium carbonate obtained by the process comprising the steps of:
a) providing and calcining a calcium carbonate comprising material to obtain a reaction
product comprising calcium oxide; b) slaking the reaction product obtained from step a) with an aqueous ammonium chloride solution; c) separating insoluble components from the calcium chloride solution obtained from step b); d) carbonating the calcium chloride solution obtained from step c) to form precipitated calcium carbonate; e) separating the precipitated calcium carbonate obtained from step d), wherein seed crystals are added to the calcium chloride solution obtained from step c) before precipitation.