EP1180090A1 - Composition de matiere comprenant des pigments de carbonate de calcium a haute brillance et procedes de fabrication - Google Patents

Composition de matiere comprenant des pigments de carbonate de calcium a haute brillance et procedes de fabrication

Info

Publication number
EP1180090A1
EP1180090A1 EP00914817A EP00914817A EP1180090A1 EP 1180090 A1 EP1180090 A1 EP 1180090A1 EP 00914817 A EP00914817 A EP 00914817A EP 00914817 A EP00914817 A EP 00914817A EP 1180090 A1 EP1180090 A1 EP 1180090A1
Authority
EP
European Patent Office
Prior art keywords
calcium carbonate
magnetic separation
slurry
brightness
impurities
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP00914817A
Other languages
German (de)
English (en)
Inventor
Michael W. Ginn
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP1180090A1 publication Critical patent/EP1180090A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • C01F11/185—After-treatment, e.g. grinding, purification, conversion of crystal morphology
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2006/00—Physical properties of inorganic compounds
    • C01P2006/60—Optical properties, e.g. expressed in CIELAB-values
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2006/00—Physical properties of inorganic compounds
    • C01P2006/80—Compositional purity

Definitions

  • composition of matter comprising high brightness calcium carbonate
  • Patents 3,980,240 and 3.990,642 issued to Nott in the 1970's
  • the present invention makes possible the commercial
  • the magnetic separation process is a contaminant removal
  • Carbonates such as dolomite, ankerite, and siderite;
  • Sulfides such as pyrite, marcasite, bornite, and
  • Oxides such as hematite, ilmenite, chromite, and rutile;
  • Silicates such as chlorite, biotite, muscovite, and amphiboles.
  • Magnetic polymers are also used to increase the magnetic
  • silicates such as quartz.
  • Magnetic separation may be used in calcium carbonate
  • the present invention may reduce processing costs for
  • the present invention produces a calcium carbonate with the
  • the slurry solids may be run from 5% to 65% at temperatures of 50
  • the slurry should be dispersed to
  • a composition of matter comprising a high brightness, whiteness, and opacity calcium carbonate pigment is produced by using
  • slurry temperature is maintained at or above 50 degrees C.
  • Magnetic separation is applied to a dispersed mineral system to
  • Figure 1 is a schematic diagram of a superconducting high
  • high gradient magnetic separator of the type preferred in and as
  • Figure 2 is a schematic flow diagram of low and high solid
  • Figure 3 illustrates the slurry dynamics of fine particle slurries.
  • Figure 4 illustrates the time vs. brightness relation for a typical
  • Figure 5 illustrates the separation time vs. brightness relation
  • Figure 6 illustrates the separation time vs. brightness data at a
  • Figure 7 illustrates the separation time vs. brightness data for a
  • the present invention produces a calcium carbonate with the
  • the present invention may be carried out with any suitable
  • cryostat 20 and cryogen storage 8 serve to cool the superconducting coil 18 which surrounds the canister
  • Such a magnetic separation unit will be run at 2 or 3
  • fiber or strand size of the matrix may be from 22 um to 75um, with 30 um
  • the slurry may be fed at
  • canister of from 0.5 to 2.0 minutes.
  • the slurry solids may be run from 5-65% at temperatures of 50
  • a material is produced having a particle size diameter of d50 equal to approximately 10 to 15 um.
  • This material is made down in water and conditioned with a conventional
  • wet grinding means with the particle size being from 50% to 98% ⁇ 2um.
  • the material is subjected to classification, if required, at 34 and passed
  • the slurry is subjected to evaporation and dewatering at
  • a high solids slurry is produced at 40 on the order of 70% to 76%
  • the material is subjected to classification,
  • a 70% to 76% solids slurry may be prepared
  • Figure 4 shows the time vs. brightness curve 64 for a sample
  • Figure 5 shows the separation time vs. GE brightness on curve
  • Figure 6 shows separation time vs. GE., Tappi, Brightness in
  • canister volumes per minute is shown at 70 to be 97.65.
  • the 2 CVS/min is equal to a flow rate of 0.66 cm/sec and
  • the starting material was a calcium
  • Brightness is measured by a well-known instruments made by the Techudyne Corp. , such as the TB 1-C.
  • the value of brightness as
  • scattering coefficient, S The scattering coefficient, S, of a given filler
  • pigment is a property well known and extensively utilized in the paper technologies and art and has been the subject of numerous technical papers.
  • Abrasion may be measured by the well-known Valley Abrasion
  • Oil Absorption may be measured as set forth in ASTM D 281-
  • Particle size may be determined by sedimentations methods as
  • Brightness units of 1.5 -2.0% although brightness increases of as much as
  • the present invention has
  • the present invention has successfully separated calcium
  • the residence time was varied from 0.5 to 3 minutes with
  • Example 2-A non-floated ground calcium carbonate sample showed
  • Example 3-A southeastern US sample was processed at 3 Tesla
  • Example 6- The following GE brightnesses were obtained from
  • Example 7-A southeastern US calcium carbonate sample was
  • the present invention produces the maximum
  • the process of the present invention provides significant
  • Equipment such as ACM mills, CMT mills, classifiers, and the like.
  • Equipment such as ACM mills, CMT mills, classifiers, and the like.
  • Equipment such as ACM mills, CMT mills, classifiers, and the like.
  • CMT air classification grinding mills are particularly effective at this stage.
  • the pulverizing is
  • the pulverization and milling in general, deagglomerates and
  • Suitable equipment includes ACM and CMT mills and various classifiers. In some cases all of these steps may be accomplished in a single
  • the product may also be screened to remove residue.
  • the grinding stage may be required for various applications.
  • Blending of other minerals is also an option for this processing
  • Products of the present invention may be used in a wide variety
  • the products may be tailored as pigments for use in
  • the pigments may also be used in paints
  • ozone or other suitable agents may further improve brightness.
  • Organic polyaculate dispersants may be employed in the following
  • chlorides and lauric acid may be used in an amount such as
  • Magnetic rejects may be used to add opacity in certain cases.
  • the present invention produces a calcium carbonate with the
  • the slurry solids may be run from 5% to 65% at temperatures of 50
  • the slurry should be dispersed to
  • a composition of matter comprising high brightness and
  • Magnetic separation is applied to a dispersed mineral system to
  • the present invention also includes the processes for the production of high brightness calcium carbonate pigments by the use of
  • b 0.5 or less, usually less than 0.0.

Landscapes

  • 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)

Abstract

La présente invention concerne des pigments de carbonate de calcium (44 et 58) à brillance, blancheur et opacité élevées pouvant être obtenus par la séparation magnétique (34 et 50). Plus particulièrement, elle concerne une composition de matière comprenant des pigments de carbonate de calcium (44 et 58) à haute brillance obtenus par la séparation magnétique (34 et 50) effectuée sur une pulpe adéquatement dispersée et de viscosité minimale afin d'optimiser la libération et l'élimination des contaminants, les impuretés étant libérées par broyage et en cours du broyage (32 et 46) préalable à la séparation magnétique (34 et 50) tout en maintenant ladite pulpe à des températures égales ou supérieures à 50 °C. L'invention concerne également la séparation magnétique (34 et 50) d'une dispersion d'une pulpe à viscosité minimale en vue de séparer les particules grossières des particules ultrafines dans des pulpes comprenant 5 % à 65 % de solides par l'enlèvement et la séparation sélective, au moins en partie, des constituants dolomitiques des systèmes minéraux du carbonate de calcium.
EP00914817A 1999-03-02 2000-03-02 Composition de matiere comprenant des pigments de carbonate de calcium a haute brillance et procedes de fabrication Withdrawn EP1180090A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US260812 1988-10-21
US26081299A 1999-03-02 1999-03-02
PCT/US2000/005631 WO2000051941A1 (fr) 1999-03-02 2000-03-02 Composition de matiere comprenant des pigments de carbonate de calcium a haute brillance et procedes de fabrication

Publications (1)

Publication Number Publication Date
EP1180090A1 true EP1180090A1 (fr) 2002-02-20

Family

ID=22990720

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00914817A Withdrawn EP1180090A1 (fr) 1999-03-02 2000-03-02 Composition de matiere comprenant des pigments de carbonate de calcium a haute brillance et procedes de fabrication

Country Status (5)

Country Link
EP (1) EP1180090A1 (fr)
AU (1) AU3615800A (fr)
CA (1) CA2364743A1 (fr)
MX (1) MXPA01008945A (fr)
WO (1) WO2000051941A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6143065A (en) * 1999-07-12 2000-11-07 J. M. Huber Corporation Precipitated calcium carbonate product having improved brightness and method of preparing the same
US7105139B2 (en) 2002-04-25 2006-09-12 Imerys Pigments, Inc. Stabilization of the viscosity of formamidine sulfinic acid bleached calcium carbonate slurries
KR100487728B1 (ko) * 2002-06-11 2005-05-03 이대생 건식분쇄 및 분급에 의한 탄산칼슘 미분말의 제조 방법
US8033398B2 (en) 2005-07-06 2011-10-11 Cytec Technology Corp. Process and magnetic reagent for the removal of impurities from minerals
ES2625114T3 (es) 2007-01-05 2017-07-18 Cytec Technology Corp. Procedimiento para la eliminación de impurezas de minerales de carbonato
GB0703634D0 (en) * 2007-02-23 2007-04-04 Imerys Minerals Ltd Treatment of white inorganic ores
US8501030B2 (en) 2008-03-09 2013-08-06 Imerys Pigments, Inc. Methods for purifying kaolin clays using reverse flotation, high brightness kaolin products, and uses thereof
US10590003B1 (en) 2017-08-24 2020-03-17 Mississippi Lime Company Method of brightening ground calcium carbonate

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3985646A (en) * 1974-08-08 1976-10-12 J. M. Huber Corporation Method for magnetic beneficiation of particle dispersions
US3980240A (en) * 1975-04-11 1976-09-14 Anglo-American Clays Corporation Brightening of natural calcitic ores
US5690897A (en) * 1994-11-21 1997-11-25 Minerals Technologies Inc. Method for purification of calcium carbonate

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0051941A1 *

Also Published As

Publication number Publication date
CA2364743A1 (fr) 2000-09-08
WO2000051941A1 (fr) 2000-09-08
MXPA01008945A (es) 2003-07-21
AU3615800A (en) 2000-09-21

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