Title:
改善された明度を有するパルプ工場廃棄物由来の沈降炭酸カルシウム、この製造方法および使用
Document Type and Number:
Japanese Patent JP5778858
Kind Code:
B2
Abstract:
The present invention relates to a process for the production of a precipitated divalent metal ion carbonate product from a divalent metal ion carbonate which was recovered from waste, the precipitated divalent metal ion carbonate product having an improved brightness, the process comprising the steps of: providing a low-purity divalent metal ion carbonate material, the divalent metal ion carbonate material being recovered from waste; calcining the divalent metal ion carbonate material in order to obtain a divalent metal ion oxide; slaking the divalent metal ion oxide in order to obtain an aqueous suspension of a divalent metal ion hydroxide; carbonating the aqueous suspension of the divalent metal ion hydroxide with a carbon dioxide containing compound in order to obtain fine precipitated divalent metal ion carbonate particles; post-treating the fine precipitated divalent metal ion carbonate particles to obtain fine discrete precipitated divalent metal ion carbonate particles; adding the fine discrete precipitated divalent metal ion carbonate particles to an aqueous suspension of divalent metal ion hydroxide that was obtained by slaking high-purity divalent metal ion hydroxide in order to obtain a resulting reaction mixture; and carbonating the resulting reaction mixture in order to obtain the precipitated divalent metal ion carbonate product having an improved brightness.
Inventors:
Paul, Michael
Scheumel Tour, Thomas
Scheumel Tour, Thomas
Application Number:
JP2014510729A
Publication Date:
September 16, 2015
Filing Date:
May 08, 2012
Export Citation:
Assignee:
OMYA International AG
International Classes:
C01F11/18; C01B32/60; D21H17/63
Domestic Patent References:
| JP2000178024A | ||||
| JP6041892A |
Foreign References:
| WO2008013180A1 |
Attorney, Agent or Firm:
Kawaguchi International Patent Office