Invention Grant
- Patent Title: Process for the production of precipitated calcium carbonate, precipitated calcium carbonate and uses thereof
- Patent Title (中): 制备沉淀碳酸钙,沉淀碳酸钙的方法及其用途
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Application No.: US14125630Application Date: 2012-06-19
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Publication No.: US09150738B2Publication Date: 2015-10-06
- Inventor: Mathieu Skrzypczak , Marc Maurer , Thomas Schmölzer
- Applicant: Mathieu Skrzypczak , Marc Maurer , Thomas Schmölzer
- Applicant Address: CH Oftringen
- Assignee: Omya International AG
- Current Assignee: Omya International AG
- Current Assignee Address: CH Oftringen
- Agency: Amster, Rothstein & Ebenstein LLP
- Priority: EP11170652 20110621
- International Application: PCT/EP2012/061698 WO 20120619
- International Announcement: WO2012/175490 WO 20121227
- Main IPC: C09C1/02
- IPC: C09C1/02 ; C01F11/18 ; C09D7/12 ; C08K3/26

Abstract:
The present invention relates to a process for the production of precipitated calcium carbonate, comprising the following steps: a) providing a reaction vessel containing an aqueous phase at an initial temperature; b) injecting a carbon dioxide generating compound into the aqueous phase until the pH of the aqueous phase is in the range of around 5 to around 7; and c) subsequently adding a calcium hydroxide slurry at an initial temperature to the reaction vessel while continuing the injection of the carbon dioxide generating compound, in order to obtain an aqueous slurry of the precipitated calcium carbonate. The addition rate of the calcium hydroxide slurry to the reaction vessel in step c) is such that an average electrical conductivity of the reaction contents in the reaction vessel during the reaction is in a range of 100 to 6 000 μS/cm.
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