EP1180090A1 - Zusammensetzung , sehr helle calciumcarbonatpigmente enthaltend und verfahren zur herstellung - Google Patents
Zusammensetzung , sehr helle calciumcarbonatpigmente enthaltend und verfahren zur herstellungInfo
- 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- Withdrawn
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)
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 (en) | 1999-03-02 | 2000-03-02 | A composition of matter comprising high brightness calcium carbonate pigments and processes for making same |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1180090A1 true EP1180090A1 (de) | 2002-02-20 |
Family
ID=22990720
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00914817A Withdrawn EP1180090A1 (de) | 1999-03-02 | 2000-03-02 | Zusammensetzung , sehr helle calciumcarbonatpigmente enthaltend und verfahren zur herstellung |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1180090A1 (de) |
AU (1) | AU3615800A (de) |
CA (1) | CA2364743A1 (de) |
MX (1) | MXPA01008945A (de) |
WO (1) | WO2000051941A1 (de) |
Families Citing this family (8)
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 |
BRPI0721413B1 (pt) | 2007-01-05 | 2018-06-12 | Cytec Technology Corp. | Processo para o beneficiamento dos substratos de minerais de carbonato |
GB0703634D0 (en) * | 2007-02-23 | 2007-04-04 | Imerys Minerals Ltd | Treatment of white inorganic ores |
EP2274234A4 (de) | 2008-03-09 | 2015-08-19 | Imerys Pigments Inc | Verfahren zur reinigung von kaolin-tonen mittels umkehrflotation, kaolinprodukte mit hoher helligkeit und verwendungen davon |
US10590003B1 (en) | 2017-08-24 | 2020-03-17 | Mississippi Lime Company | Method of brightening ground calcium carbonate |
Family Cites Families (3)
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 |
-
2000
- 2000-03-02 CA CA002364743A patent/CA2364743A1/en not_active Abandoned
- 2000-03-02 MX MXPA01008945A patent/MXPA01008945A/es unknown
- 2000-03-02 EP EP00914817A patent/EP1180090A1/de not_active Withdrawn
- 2000-03-02 WO PCT/US2000/005631 patent/WO2000051941A1/en not_active Application Discontinuation
- 2000-03-02 AU AU36158/00A patent/AU3615800A/en not_active Abandoned
Non-Patent Citations (1)
Title |
---|
See references of WO0051941A1 * |
Also Published As
Publication number | Publication date |
---|---|
AU3615800A (en) | 2000-09-21 |
MXPA01008945A (es) | 2003-07-21 |
CA2364743A1 (en) | 2000-09-08 |
WO2000051941A1 (en) | 2000-09-08 |
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Legal Events
Date | Code | Title | Description |
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 20010926 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE |
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AX | Request for extension of the european patent |
Free format text: AL;LT;LV;MK;RO;SI |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 20050401 |