Patent · US Active

Production of high purity precipitated calcium carbonate

US8992875B2 · kind B2 · utility

7Cited by

2References

44Claims

0Family size

Assignee

OMYA INTERNATIONAL AG · CH

Inventors

Bahman Tavakkoli · Puch, AT
Jörg Sötemann · Rheinfelden (Baden), DE
Michael Pohl · Villach, AT
Thomas Schmölzer · Villach, AT

Key dates

Filing date	Oct 20, 2011
Grant date	Mar 31, 2015
Priority date	—
Expiry date	Jan 24, 2032

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/2982
WIPO fieldMaterials, metallurgy
WIPO sectorChemistry

Abstract

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.