Production of high purity precipitated calcium carbonate

US9725330B2 · kind B2 · utility

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: Feb 23, 2015
• Grant date: Aug 8, 2017
• Expiry date: Feb 23, 2035

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/2982
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

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.