US20020164280A1 - Process for preparing precipitated calcium carbonates - Google Patents

Process for preparing precipitated calcium carbonates Download PDF

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Publication number
US20020164280A1
US20020164280A1 US10/123,425 US12342502A US2002164280A1 US 20020164280 A1 US20020164280 A1 US 20020164280A1 US 12342502 A US12342502 A US 12342502A US 2002164280 A1 US2002164280 A1 US 2002164280A1
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Prior art keywords
lime
milk
calcium carbonate
precipitated calcium
viscosity
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US10/123,425
Inventor
Andreas Kinnen
Helmut Dillenburg
Kurt Schinninger
Christoph Nover
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Solvay Chemicals GmbH
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Solvay Soda Deutschland GmbH
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Priority to US10/123,425 priority Critical patent/US20020164280A1/en
Publication of US20020164280A1 publication Critical patent/US20020164280A1/en
Assigned to SOLVAY CHEMICALS GMBH reassignment SOLVAY CHEMICALS GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SOLVAY SODA DEUTSCHLAND GMBH
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    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
    • C01F11/00—Compounds of calcium, strontium, or barium
    • C01F11/18—Carbonates
    • C01F11/181—Preparation of calcium carbonate by carbonation of aqueous solutions and characterised by control of the carbonation conditions
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
    • C01F11/00—Compounds of calcium, strontium, or barium
    • C01F11/18—Carbonates
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/141—Feedstock

Definitions

  • the invention relates to a process for the preparation of precipitated calcium carbonate which is suitable as a functional filler and is distinguished by defined properties.
  • One typical field of application is the use of the precipitated calcium carbonate as a filler in plastisols, such as underbody sealants for automobiles.
  • the precipitated calcium carbonate in this case is capable of controlling the flow behavior of the plastisols.
  • plastisols having very differing flow behaviors can be prepared.
  • high, medium or low flow limits may be desired.
  • the flow limit according to Bingham in the plasticiser mixture is usually quoted as a typical characteristic for the application-related suitability of calcium carbonates as fillers.
  • the ability of the precipitated calcium carbonate to control the flow limits is influenced, inter alia, by the nature of the burnt lime used for producing the milk of lime and by the slaking operation.
  • Finely dispersed calcium carbonate is either prepared from naturally-occurring raw materials by mechanical preparation, or chemically, e.g. by precipitation.
  • precipitated calcium carbonate is prepared by introducing CO 2 into milk of lime
  • the properties of the precipitated calcium carbonate depend, for example, on the chemical composition of the limestone used or on the burning conditions.
  • soft-burned lime is used to prepare precipitated calcium carbonate.
  • limestone is burned at a temperature of 1000 to 1250° C.
  • VEC value Véloc Congress d'Extinction de Chaux
  • Typical VEC values for burnt lime which is suitable for the preparation of precipitated calcium carbonate are above 3° C./min.
  • the burnt lime is reacted with water, for example in a slaking drum, whereupon a Ca(OH) 2 suspension, so-called milk of lime, forms.
  • the milk of lime usually has a solids content of 70 to 220 g/liter Ca(OH) 2 , a viscosity of 30 to 1500 mPas and an average particle diameter of less than 50 ⁇ m.
  • Milk of lime is used, for example, to neutralize waste water, or to prepare soda or precipitated calcium carbonate.
  • U.S. Pat. No. 3,920,800 describes a process for the preparation of precipitated calcium carbonate of high purity.
  • an aqueous calcium hydroxide slurry milk of lime
  • the calcium carbonate formed by the reaction of the calcium hydroxide with the CO 2 is free of calcium hydroxide.
  • the particle size of the calcium carbonate is controlled by means of the temperature during the grinding process. At temperatures of approximately 30° C., very small particles are obtained, and at temperatures of approximately 80° C. larger calcium carbonate particles are obtained.
  • CCP precipitated calcium carbonate
  • Known mills may be used for grinding the milk of lime.
  • Preferably bead mills are used.
  • Suitable grinding beads include, in particular, zirconium oxide grinding beads having a diameter of 0.4 to 2 mm.
  • the grinding result is greatly influenced by the fineness of the beads.
  • the grinding effect is furthermore controlled by the speed of the mill, the residence time of the milk of lime in the mill and the resulting specific energy input.
  • the average particle size of the Ca(OH) 2 particles in the milk of lime or the viscosity of the milk of lime can also be measured as a measured parameter indicating the success of grinding.
  • the course of the wet grinding can also be followed by measuring the grain distribution of the calcium hydroxide or by measuring the viscosity of the milk of lime at a defined concentration and temperature.
  • the viscosity of the milk of lime is measured and used to control the mill.
  • the viscosity should be measured without difficulty, e.g. continuously, and the mill throughput or the speed of the mill, and hence the resulting quality of the milk of lime, can be controlled automatically by means of a corresponding control circuit.
  • the milk of lime is ground to a viscosity of at most 2500 mPas. A higher viscosity should be avoided, since otherwise the introduction of the precipitating gas is not optimally possible.
  • the viscosity of the ground milk of lime should be set such that the milk of lime can flow readily, so that the precipitating gas can be dispersed homogeneously.
  • the grinding furthermore makes it possible to adjust the viscosity of the milk of lime such that calcium carbonate with application-related properties which are desired in each case, in particular as a rheological additive, can be prepared.
  • CaCO 3 can be prepared in a consistent quality which is suitable as a high functionality constituent of mixtures for e.g. polymers, polymer preparations, plastics, coating compounds, sealing compounds, paper or paints, in particular printing inks.
  • the milk of lime is supplied to a container into which CO 2 is introduced to precipitate the calcium carbonate and is homogeneously dispersed in the milk of lime.
  • the viscosity-controlled wet grinding of the milk of lime according to the invention makes it possible to significantly influence the flow limit of the CCP-filled plastisols, i.e. to adjust them specifically. It has been found that the flow limit is a function of the specific energy introduced during grinding, or of the viscosity of the milk of lime after grinding. It was therefore discovered that the properties of the CCP can be reproducibly influenced by specifically adjusting the viscosity of the milk of lime.
  • Examples 7-12 Preparation of an underbody sealant: Plasticiser, dioctyl phthalate 55 g Plasticiser, diisononyl phthalate 60 g paste-making PVC, Solvic 374 MIB 70 g paste-making PVC, Solvic 266 SF 30 g CaCO 3 , in accordance with Examples 1-6, 70.0 g respectively, coated with fatty acid UV-stabilizer, IRGASTAB 17 MOK 2.0 g Adhesion promoter, Euretek 505 4.0 g Drying agent, calcium oxide 5.0 g Example Flow limit (Pa) 7 40 8 48 9 80 10 89 11 157 12 200
  • Example 13 Preparation of an offset-printing ink Pigment, flushed, Eurolith Blue 25.0% by weight CaCO 3 , in accordance with Example 4, 15.0% by weight coated with fatty acid Printing oil, Craigrmann, PKWF 4/7 12.0% by weight Binder, Uroset 48.0% by weight Result Flow limit 31 Pa Viscosity at shear rate 3/sec 9.4 Pas Depth of color C 53 Gloss 60° 71%
  • Example 14 Preparation of polyurethane compounds, 2-component system Polyol, Desmophen 1150 150 g CaCO 3 in accordance with Example 6, 60 g coated with fatty acid Titanium dioxide pigment (rutile), 3 g Tiona Rcl-535 Dry paste, Baylith L Paste 15 g Adhesion promoter, Acronal 700L 1 g Plasticiser, Mesamoll II 35 g Polyurethane activator 1 g Isocyanate 3 g Result Flow limit according to Bingham 220 Pa Viscosity at shear rate (100/sec) 6.1 Pas Pot life 26 min Adhesion good Dispersion quality/grindometer ⁇ 35 ⁇ m
  • Example 15 Preparation of silicone compounds For testing, a non-curing silicone compound was produced which corresponds to a 2-component system, but the catalyst required for curing was not added. Silicone polymer 60 g CaCO 3 according to Example 2, 38 g coated with fatty acid Plasticizer 2 g Result Flow limit according to Casson 900 Pa Viscosity at shear rate 5/sec 280 Pas Dispersion quality/grindometer ⁇ 35 ⁇ m

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Inorganic Chemistry (AREA)
  • Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
  • Pigments, Carbon Blacks, Or Wood Stains (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

A process for the preparation of precipitated calcium carbonate by introducing CO2 into milk of lime, in which the milk of lime is first ground, and then the CO2 is introduced to precipitate the calcium carbonate.

Description

    BACKGROUND OF THE INVENTION
  • The invention relates to a process for the preparation of precipitated calcium carbonate which is suitable as a functional filler and is distinguished by defined properties. One typical field of application is the use of the precipitated calcium carbonate as a filler in plastisols, such as underbody sealants for automobiles. [0001]
  • The precipitated calcium carbonate in this case is capable of controlling the flow behavior of the plastisols. Thus, by using the calcium carbonates which are suitable in each case, plastisols having very differing flow behaviors can be prepared. Depending on the intended application, high, medium or low flow limits may be desired. The flow limit according to Bingham in the plasticiser mixture is usually quoted as a typical characteristic for the application-related suitability of calcium carbonates as fillers. The ability of the precipitated calcium carbonate to control the flow limits is influenced, inter alia, by the nature of the burnt lime used for producing the milk of lime and by the slaking operation. [0002]
  • Finely dispersed calcium carbonate is either prepared from naturally-occurring raw materials by mechanical preparation, or chemically, e.g. by precipitation. [0003]
  • Usually, precipitated calcium carbonate is prepared by introducing CO[0004] 2 into milk of lime
  • Ca(OH)2+CO2→CaCO3+H2O
  • The properties of the precipitated calcium carbonate depend, for example, on the chemical composition of the limestone used or on the burning conditions. [0005]
  • Preferably so-called soft-burned lime is used to prepare precipitated calcium carbonate. To this end, limestone is burned at a temperature of 1000 to 1250° C. [0006]
  • Among other characteristics, the ability of burnt lime to react with water is used to characterize it. The so-called VEC value (Vélocité d'Extinction de Chaux) is measured. In this case, the heating rate of a defined water/burnt lime mixture is measured. Typical VEC values for burnt lime which is suitable for the preparation of precipitated calcium carbonate are above 3° C./min. [0007]
  • To prepare the milk of lime, the burnt lime is reacted with water, for example in a slaking drum, whereupon a Ca(OH)[0008] 2 suspension, so-called milk of lime, forms. The milk of lime usually has a solids content of 70 to 220 g/liter Ca(OH)2, a viscosity of 30 to 1500 mPas and an average particle diameter of less than 50 μm.
  • Milk of lime is used, for example, to neutralize waste water, or to prepare soda or precipitated calcium carbonate. [0009]
  • One drawback of the previously known processes for preparing precipitated calcium carbonate is that it has hitherto not been possible to satisfactorily control the application-related properties of the precipitated calcium carbonate, in particular as a rheological additive, due to its average grain size, grain size distribution and particle form. [0010]
  • U.S. Pat. No. 3,920,800 describes a process for the preparation of precipitated calcium carbonate of high purity. According to the method described, an aqueous calcium hydroxide slurry (milk of lime) is ground in the presence of CO[0011] 2 at a temperature of at most 100° C. The calcium carbonate formed by the reaction of the calcium hydroxide with the CO2 is free of calcium hydroxide. The particle size of the calcium carbonate is controlled by means of the temperature during the grinding process. At temperatures of approximately 30° C., very small particles are obtained, and at temperatures of approximately 80° C. larger calcium carbonate particles are obtained.
    • SUMMARY OF THE INVENTION
  • It is the object of the invention to provide a process for preparing precipitated calcium carbonate (CCP) having defined, reproducible properties. [0012]
  • This and other objects are achieved in accordance with the invention in that the milk of lime is ground before the CO[0013] 2 is introduced to precipitate the calcium carbonate.
  • Known mills may be used for grinding the milk of lime. Preferably bead mills are used. Suitable grinding beads include, in particular, zirconium oxide grinding beads having a diameter of 0.4 to 2 mm. [0014]
  • The grinding result is greatly influenced by the fineness of the beads. [0015]
  • The grinding effect is furthermore controlled by the speed of the mill, the residence time of the milk of lime in the mill and the resulting specific energy input. [0016]
  • The average particle size of the Ca(OH)[0017] 2 particles in the milk of lime or the viscosity of the milk of lime can also be measured as a measured parameter indicating the success of grinding.
  • The course of the wet grinding can also be followed by measuring the grain distribution of the calcium hydroxide or by measuring the viscosity of the milk of lime at a defined concentration and temperature. [0018]
  • According to the invention, the viscosity of the milk of lime is measured and used to control the mill. The viscosity should be measured without difficulty, e.g. continuously, and the mill throughput or the speed of the mill, and hence the resulting quality of the milk of lime, can be controlled automatically by means of a corresponding control circuit. [0019]
  • In one embodiment of the invention, the milk of lime is ground to a viscosity of at most 2500 mPas. A higher viscosity should be avoided, since otherwise the introduction of the precipitating gas is not optimally possible. [0020]
  • Therefore, for the purposes of the invention, the viscosity of the ground milk of lime should be set such that the milk of lime can flow readily, so that the precipitating gas can be dispersed homogeneously. The grinding furthermore makes it possible to adjust the viscosity of the milk of lime such that calcium carbonate with application-related properties which are desired in each case, in particular as a rheological additive, can be prepared. Thus, depending on the intended purpose, CaCO[0021] 3 can be prepared in a consistent quality which is suitable as a high functionality constituent of mixtures for e.g. polymers, polymer preparations, plastics, coating compounds, sealing compounds, paper or paints, in particular printing inks.
  • After grinding, the milk of lime is supplied to a container into which CO[0022] 2 is introduced to precipitate the calcium carbonate and is homogeneously dispersed in the milk of lime.
  • Surprisingly, it has been discovered that the properties of the precipitated calcium carbonate can be reproduced if the milk of lime is first ground, and then CO[0023] 2 is introduced to precipitate the calcium carbonate.
  • If precipitated calcium carbonate from non-ground milk of lime is compared with that from ground milk of lime, it is apparent that the grinding has an influence on the reaction rate, on the average particle diameter of the CCP and on the use-related properties of the CCP. [0024]
  • It has been discovered that a decreasing particle size in the milk of lime also involves a reduction in the average particle diameter of the CCP. [0025]
  • It has furthermore been discovered that the precipitation time is decreased by about 20% by using the milk of lime ground according to the invention. [0026]
  • The viscosity-controlled wet grinding of the milk of lime according to the invention makes it possible to significantly influence the flow limit of the CCP-filled plastisols, i.e. to adjust them specifically. It has been found that the flow limit is a function of the specific energy introduced during grinding, or of the viscosity of the milk of lime after grinding. It was therefore discovered that the properties of the CCP can be reproducibly influenced by specifically adjusting the viscosity of the milk of lime. [0027]
  • The undesirable influencing of the properties of the CCP by undefined fluctuations in the nature of the burnt lime and of the slaking operation are cancelled out by the grinding of the milk of lime according to the invention.[0028]
    • DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
  • The following examples are intended to illustrate the invention in further detail without restricting its scope. [0029]
    Examples 1-6:
    Burnt lime was slaked in a slaking drum:
    Lump size 2-5 cm
    VEC: 4.8° C./min
    The resulting milk of lime was ground and characterized:
    solids content 150 g/liter
    average particle diameter D50: 4.4 μm
  • Grinding Conditions: [0030]
  • horizontal attrition mill [0031]
  • grinding chamber volume 5 liters [0032]
  • 22 kW motor power [0033]
  • grinding bodies: [0034]
  • spheres of zirconium silicate [0035]
  • diameter 1.0-1.6 mm [0036]
  • filled volume: 4.8 liters [0037]
  • The tests were performed at a constant speed of 1990 rpm. The residence time of the milk of lime in the mill was varied. Different specific energy inputs resulted from this. [0038]
  • Calcium carbonate was produced from the resulting ground milk of lime by introducing CO[0039] 2-containing gas:
    Precipitation conditions:
    Precipitation temperature: 18° C.
    CO2 concentration in the 30% by volume
    precipitating gas:
    Gas stream: 1 m3/hour per 10 liters
    milk of lime
    Duration of precipitation: see table
    Subsequent treatment: 2% fatty acid
    Grinding CCP precipitation CCP
    Specific energy Milk of lime Duration of CCP particle
    (kWh/t) relative Viscosity Milk of lime precipitation diameter
    Example to dry product (mPas) D50 (μm) (min) dp (nm)
    1  0  45 4.4 98 70
    2  23  50 4.4 94 71
    3  31 105 3.2 92 66
    4 113 135 2.8 83 62
    5 254 860 2.1 79 63
    6 307 1120  1.8 77 61
  • It is apparent that the viscosity of the milk of lime and the average particle diameter of the milk of lime can be controlled specifically by the wet grinding. This means that the duration of precipitation of CCP can be reduced to 20%. The particle diameters of CCP are reproducibly adjusted. [0040]
    Examples 7-12:
    Preparation of an underbody sealant:
    Plasticiser, dioctyl phthalate 55 g
    Plasticiser, diisononyl phthalate 60 g
    paste-making PVC, Solvic 374 MIB 70 g
    paste-making PVC, Solvic 266 SF 30 g
    CaCO3, in accordance with Examples 1-6, 70.0 g
    respectively, coated with fatty acid
    UV-stabilizer, IRGASTAB 17 MOK 2.0 g
    Adhesion promoter, Euretek 505 4.0 g
    Drying agent, calcium oxide 5.0 g
    Example Flow limit (Pa)
    7 40
    8 48
    9 80
    10 89
    11 157
    12 200
  • CCP from Examples 1-6, respectively, was used in each case to produce underbody sealants corresponding to the formulation described. It becomes clear that the flow limit of the CCP-filled plastisol can also be specifically controlled by wet grinding the milk of lime. [0041]
    Example 13:
    Preparation of an offset-printing ink
    Pigment, flushed, Eurolith Blue 25.0% by weight
    CaCO3, in accordance with Example 4, 15.0% by weight
    coated with fatty acid
    Printing oil, Haltermann, PKWF 4/7 12.0% by weight
    Binder, Uroset 48.0% by weight
    Result
    Flow limit  31 Pa
    Viscosity at shear rate 3/sec 9.4 Pas
    Depth of color C  53
    Gloss 60°  71%
  • [0042]
    Example 14:
    Preparation of polyurethane compounds,
    2-component system
    Polyol, Desmophen 1150 150 g
    CaCO3 in accordance with Example 6, 60 g
    coated with fatty acid
    Titanium dioxide pigment (rutile), 3 g
    Tiona Rcl-535
    Dry paste, Baylith L Paste 15 g
    Adhesion promoter, Acronal 700L 1 g
    Plasticiser, Mesamoll II 35 g
    Polyurethane activator 1 g
    Isocyanate 3 g
    Result
    Flow limit according to Bingham 220 Pa
    Viscosity at shear rate (100/sec) 6.1 Pas
    Pot life 26 min
    Adhesion good
    Dispersion quality/grindometer <35 μm
  • [0043]
    Example 15:
    Preparation of silicone compounds
    For testing, a non-curing silicone compound was produced
    which corresponds to a 2-component system, but the catalyst
    required for curing was not added.
    Silicone polymer 60 g
    CaCO3 according to Example 2, 38 g
    coated with fatty acid
    Plasticizer 2 g
    Result
    Flow limit according to Casson 900 Pa
    Viscosity at shear rate 5/sec 280 Pas
    Dispersion quality/grindometer <35 μm
  • The foregoing description and examples have been set forth merely to illustrate the invention and are not intended to be limiting. Since modifications of the disclosed embodiments incorporating the spirit and substance of the invention may occur to persons skilled in the art, the invention should be construed broadly to include all variations falling within the scope of the appended claims and equivalents thereof. [0044]

Claims (4)

What is claimed is:
1. A process for the preparation of precipitated calcium carbonate with reproducible application-related properties, said method comprising the steps of:
subjecting milk of lime to specific grinding treatment to obtain ground milk of lime, and
thereafter introducing CO2 into the ground milk of lime to precipitate the calcium carbonate.
2. A process for the preparation of precipitated calcium carbonate according to claim 1, further comprising the steps of:
continuously measuring the viscosity of the milk of lime during the specific grinding treatment, and
controlling the grinding in response to the measured viscosity to regulate the quality of the ground milk of lime.
3. A process for the preparation of precipitated calcium carbonate according to claim 1, wherein the specific grinding is controlled to produce ground milk of lime having a viscosity of at most 2500 mPas.
4. A process for the preparation of precipitated calcium carbonate according to claim 2, wherein the specific grinding is controlled to produce ground milk of lime having a viscosity of at most 2500 mPas.
US10/123,425 1999-01-02 2002-04-17 Process for preparing precipitated calcium carbonates Abandoned US20020164280A1 (en)

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US09/476,111 US6500400B1 (en) 1999-01-02 2000-01-03 Process for preparing precipitated calcium carbonates
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US20050126342A1 (en) * 2002-05-10 2005-06-16 Jerker Sterneland Method to improve iron production rate in a blast furnace
US20100282127A1 (en) * 2007-12-12 2010-11-11 Gerard Daniel E Surface-reacted precipitated calcium carbonate, process to make same, and uses thereof
CN101967000A (en) * 2010-07-14 2011-02-09 山东海泽纳米材料有限公司 Method for preparing high-solid-content and low-viscosity suspended nano calcium carbonate slurry and re-suspended nano calcium carbonate power
WO2011154610A1 (en) * 2010-06-11 2011-12-15 Wetend Technologies Oy Method and apparatus for in-line production of milk of lime into an in-line production process of pcc arranged in connection with a fibrous web machine
US8857118B2 (en) 2007-05-24 2014-10-14 Calera Corporation Hydraulic cements comprising carbonate compound compositions
CN106752102A (en) * 2016-11-21 2017-05-31 广西华纳新材料科技有限公司 A kind of preparation method of the high-dispersion nano calcium carbonate for being applied to nylon engineering plastic
US10584038B2 (en) * 2014-12-12 2020-03-10 Omya International Ag Process for the production of precipitated calcium carbonate

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DE10017273A1 (en) * 2000-04-06 2001-10-18 Solvay Soda Deutschland Gmbh Production of precipitated calcium carbonate comprises controlling the functional properties of the product by controlling the viscosity of the milk of lime
AU2002316276A1 (en) * 2002-06-18 2003-12-31 Specialty Minerals (Michigan) Inc. Process for the production of precipitated calcium carbonates and product produced thereby
US20050089466A1 (en) * 2003-10-27 2005-04-28 Degenova Mark G. Methods and apparatus for producing precipitated calcium carbonate
US7361324B2 (en) * 2004-06-21 2008-04-22 J. M. Huber Corporation Precipitated calcium carbonate
EP1795502A1 (en) * 2005-12-12 2007-06-13 SOLVAY (Société Anonyme) Particles of precipitated calcium carbonate, process for making the particles and use of the particles as filler
US7468101B2 (en) * 2006-08-17 2008-12-23 Specialty Minerals (Michigan) Inc. UV varnish gloss performance using novel pigment and process for making same
DE102007018240A1 (en) * 2007-04-18 2008-10-23 Voith Patent Gmbh Process for the formation of calcium carbonate in a pulp suspension
DE102007028540A1 (en) * 2007-06-21 2008-12-24 Voith Patent Gmbh Process for forming fillers, especially calcium carbonate in a pulp suspension
EP2537806B1 (en) 2010-02-15 2019-12-04 Shiraishi Kogyo Kaisha, Ltd. Surface-treated calcium carbonate and paste-like resin composition containing same
KR101100619B1 (en) * 2011-04-13 2012-01-03 주식회사 백광소재 A method of pcc with new form and a method of control for particle
JP2014534153A (en) * 2011-10-13 2014-12-18 ２２６２５５４ オンタリオ インコーポレイテッド Method and apparatus for producing calcium hydroxide particles coated with calcium carbonate
BE1021522B1 (en) 2012-09-12 2015-12-07 S.A. Lhoist Recherche Et Developpement HIGH FINENSE LIME MILK COMPOSITION
WO2016041643A1 (en) * 2014-09-08 2016-03-24 S.A. Lhoist Recherche Et Developpement Process for manufacturing a milk of slaked lime of great fineness and milk of lime of great fineness thereby obtained

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