公开(公告)号：US09776884B2

公开(公告)日：2017-10-03

申请号：US14907734

申请日：2014-08-08

Applicant: Omya International AG

Inventor： Marc Maurer ,  Thomas Schlotterbach ,  Mathieu Skrzypczak ,  Robert Pirker

IPC: C01F11/18

CPC classification number: C01F11/182 ,  C01F11/181 ,  C01F11/187 ,  C01P2004/51 ,  C01P2006/12 ,  C01P2006/80 ,  C09C1/021

Abstract: The present invention provides a process for preparing a precipitated calcium carbonate product comprising the steps of: (a) preparing an aqueous suspension of precipitated calcium carbonate seeds by carbonating a suspension of Ca(OH)2 in the presence of 0.005 to 0.030 moles of Sr, in the form of Sr(OH)2, per mole of Ca(OH)2, (b) dewatering and dispersing the precipitated calcium carbonate seeds prepared in step (a) to obtain an aqueous suspension of precipitated calcium carbonate seeds having a d50 of less than or equal to 0.1 to 0.3 μm and a BET specific surface area of 10 to 30 m2/g, and (c) forming an aqueous suspension of a precipitated calcium carbonate product by carbonating a slurry of Ca(OH)2 in the presence of 0.5 to 5% by dry weight of the precipitated calcium carbonate seeds obtained in step (b), wherein the precipitated calcium carbonate seeds have a d50 that is less than the d50 of the precipitated calcium carbonate product and the precipitated calcium carbonate seeds have an aragonitic polymorph content greater than or equal to the precipitated calcium carbonate product obtained in step (c) characterized in that the dewatering of step (b) is carried out by the use of a tube press.

公开(公告)号：US10343929B2

公开(公告)日：2019-07-09

申请号：US15417578

申请日：2017-01-27

Applicant: Omya International AG

Inventor： Marc Maurer ,  Thomas Schlotterbach ,  Mathieu Skrzypczak ,  Robert Pirker

IPC: C01F11/18 ,  C09C1/02

Abstract: The present invention provides a process for preparing a precipitated calcium carbonate product comprising the steps of: (a) preparing an aqueous suspension of precipitated calcium carbonate seeds by carbonating a suspension of Ca(OH)2 in the presence of 0.005 to 0.030 moles of Sr, in the form of Sr(OH)2, per mole of Ca(OH)2, (b) dewatering and dispersing the precipitated calcium carbonate seeds prepared in step (a) to obtain an aqueous suspension of precipitated calcium carbonate seeds having a d50 of less than or equal to 0.1 to 0.3 μm and a BET specific surface area of 10 to 30 m2/g, and (c) forming an aqueous suspension of a precipitated calcium carbonate product by carbonating a slurry of Ca(OH)2 in the presence of 0.5 to 5% by dry weight of the precipitated calcium carbonate seeds obtained in step (b), wherein the precipitated calcium carbonate seeds have a d50 that is less than the d50 of the precipitated calcium carbonate product and the precipitated calcium carbonate seeds have an aragonitic polymorph content greater than or equal to the precipitated calcium carbonate product obtained in step (c) characterized in that the dewatering of step (b) is carried out by the use of a tube press.

公开(公告)号：US20170137299A1

公开(公告)日：2017-05-18

申请号：US15417578

申请日：2017-01-27

Applicant: Omya International AG

Inventor： Marc Maurer ,  Thomas Schlotterbach ,  Mathieu Skrzypczak ,  Robert Pirker

IPC: C01F11/18 ,  C09C1/02

CPC classification number: C01F11/182 ,  C01F11/181 ,  C01F11/187 ,  C01P2004/51 ,  C01P2006/12 ,  C01P2006/80 ,  C09C1/021

Abstract: The present invention provides a process for preparing a precipitated calcium carbonate product comprising the steps of: (a) preparing an aqueous suspension of precipitated calcium carbonate seeds by carbonating a suspension of Ca(OH)2 in the presence of 0.005 to 0.030 moles of Sr, in the form of Sr(OH)2, per mole of Ca(OH)2, (b) dewatering and dispersing the precipitated calcium carbonate seeds prepared in step (a) to obtain an aqueous suspension of precipitated calcium carbonate seeds having a d50 of less than or equal to 0.1 to 0.3 μm and a BET specific surface area of 10 to 30 m2/g, and (c) forming an aqueous suspension of a precipitated calcium carbonate product by carbonating a slurry of Ca(OH)2 in the presence of 0.5 to 5% by dry weight of the precipitated calcium carbonate seeds obtained in step (b), wherein the precipitated calcium carbonate seeds have a d50 that is less than the d50 of the precipitated calcium carbonate product and the precipitated calcium carbonate seeds have an aragonitic polymorph content greater than or equal to the precipitated calcium carbonate product obtained in step (c) characterized in that the dewatering of step (b) is carried out by the use of a tube press.

公开(公告)号：US20160167977A1

公开(公告)日：2016-06-16

申请号：US14907734

申请日：2014-08-08

Applicant: OMYA INTERNATIONAL AG

Inventor： Marc Maurer ,  Thomas Schlotterbach ,  Mathieu Skrzypczak ,  Robert Pirker

IPC: C01F11/18

CPC classification number: C01F11/182 ,  C01F11/181 ,  C01F11/187 ,  C01P2004/51 ,  C01P2006/12 ,  C01P2006/80 ,  C09C1/021

Abstract: The present invention provides a process for preparing a precipitated calcium carbonate product comprising the steps of: (a) preparing an aqueous suspension of precipitated calcium carbonate seeds by carbonating a suspension of Ca(OH)2 in the presence of 0.005 to 0.030 moles of Sr, in the form of Sr(OH)2, per mole of Ca(OH)2, (b) dewatering and dispersing the precipitated calcium carbonate seeds prepared in step (a) to obtain an aqueous suspension of precipitated calcium carbonate seeds having a d50 of less than or equal to 0.1 to 0.3 um and a BET specific surface area of 10 to 30 m2/g, and (c) forming an aqueous suspension of a precipitated calcium carbonate product by carbonating a slurry of Ca(OH)2 in the presence of 0.5 to 5% by dry weight of the precipitated calcium carbonate seeds obtained in step (b), wherein the precipitated calcium carbonate seeds have a d50 that is less than the d50 of the precipitated calcium carbonate product and the precipitated calcium carbonate seeds have an aragonitic polymorph content greater than or equal to the precipitated calcium carbonate product obtained in step (c) characterized in that the dewatering of step (b) is carried out by the use of a tube press.

Abstract translation: 本发明提供一种制备沉淀碳酸钙产品的方法，包括以下步骤：（a）通过在0.005-0.030摩尔的Sr存在下碳酸化Ca（OH）2的悬浮液来制备沉淀碳酸钙晶种的水悬浮液 以Sr（OH）2的形式，每摩尔Ca（OH）2，（b）脱水和分散步骤（a）中制备的沉淀碳酸钙晶种，得到具有d50的沉淀碳酸钙种子的水悬浮液 小于或等于0.1至0.3μm，BET比表面积为10至30m2 / g，（c）通过将Ca（OH）2的浆料碳酸化形成沉淀的碳酸钙产物的水悬浮液 存在步骤（b）中获得的沉淀碳酸钙种子为干重0.5-5％，其中沉淀碳酸钙种子的d50小于沉淀碳酸钙产物和沉淀碳酸钙种子的d50 e是大于或等于步骤（c）中获得的沉淀碳酸钙产品的文石多晶型物质，其特征在于步骤（b）的脱水通过使用管压机进行。