FI964132A - Process and equipment for producing precipitated calcium carbonate - Google Patents

Process and equipment for producing precipitated calcium carbonate Download PDF

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Publication number
FI964132A
FI964132A FI964132A FI964132A FI964132A FI 964132 A FI964132 A FI 964132A FI 964132 A FI964132 A FI 964132A FI 964132 A FI964132 A FI 964132A FI 964132 A FI964132 A FI 964132A
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FI
Finland
Prior art keywords
homogeneous
crystals
filtration
beater
unit
Prior art date
Application number
FI964132A
Other languages
Finnish (fi)
Swedish (sv)
Other versions
FI964132A0 (en
FI103402B (en
FI103402B1 (en
Inventor
Pentti Virtanen
Original Assignee
Kautar Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Kautar Oy filed Critical Kautar Oy
Priority to FI964132A priority Critical patent/FI103402B1/en
Publication of FI964132A0 publication Critical patent/FI964132A0/en
Publication of FI964132A publication Critical patent/FI964132A/en
Application granted granted Critical
Publication of FI103402B publication Critical patent/FI103402B/en
Publication of FI103402B1 publication Critical patent/FI103402B1/en

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Abstract

A process and a device for preparing precipitated calcium carbonate which had been produced by causticizing. The process consists of homogeneous process steps and filtration. The homogeneous process steps consist of lime slaking in a beater mixer, with 80% of the slaked calcium hydroxide particles being less than 3 micrometres, contact between the slaked lime and sodium carbonate in the beater mixer, maturation of the reaction mixture in an unmixed state, interruption of the growth of the crystals in the beater mixer or in a corresponding device which provides a homogeneous dwell time and an impact energy, and separation of the crystals and the caustic liquor which has formed by means of filtration. According to the invention, the growth of the crystals is interrupted by means of a homogeneous beater mixing when the viscosity of the standing and maturing mass has decreased following gel formation, and the crystal size is regulated during the period thereafter. The device comprises three independent units, namely the slaking unit, the reactor and maturation unit and the filtration and suspension unit.
FI964132A 1996-10-14 1996-10-14 Process and device for preparing precipitated calcium carbonate FI103402B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FI964132A FI103402B1 (en) 1996-10-14 1996-10-14 Process and device for preparing precipitated calcium carbonate

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI964132 1996-10-14
FI964132A FI103402B1 (en) 1996-10-14 1996-10-14 Process and device for preparing precipitated calcium carbonate

Publications (4)

Publication Number Publication Date
FI964132A0 FI964132A0 (en) 1996-10-14
FI964132A true FI964132A (en) 1998-04-15
FI103402B FI103402B (en) 1999-06-30
FI103402B1 FI103402B1 (en) 1999-06-30

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ID=8546866

Family Applications (1)

Application Number Title Priority Date Filing Date
FI964132A FI103402B1 (en) 1996-10-14 1996-10-14 Process and device for preparing precipitated calcium carbonate

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FI (1) FI103402B1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6475459B1 (en) 1997-09-08 2002-11-05 Fp-Pigments Oy Process for preparing calcium carbonate particles

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6475459B1 (en) 1997-09-08 2002-11-05 Fp-Pigments Oy Process for preparing calcium carbonate particles

Also Published As

Publication number Publication date
FI964132A0 (en) 1996-10-14
FI103402B (en) 1999-06-30
FI103402B1 (en) 1999-06-30

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Owner name: FP-PIGMENTS OY

MA Patent expired