US3904130A - Mill for grinding minerals - Google Patents

Mill for grinding minerals Download PDF

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US3904130A
US3904130A US401487A US40148773A US3904130A US 3904130 A US3904130 A US 3904130A US 401487 A US401487 A US 401487A US 40148773 A US40148773 A US 40148773A US 3904130 A US3904130 A US 3904130A
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grinding
mill
weight
balls
diameter
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US401487A
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Pierre Delfosse
Alfred Bosshard
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Omya AG
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Pluess Staufer AG
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK  ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
    • C09C3/00—Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
    • C09C3/04—Physical treatment, e.g. grinding, treatment with ultrasonic vibrations
    • C09C3/041—Grinding
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/24—Acids; Salts thereof
    • C08K3/26—Carbonates; Bicarbonates
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK  ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
    • C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
    • C09C1/02—Compounds of alkaline earth metals or magnesium
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/60—Additives non-macromolecular
    • C09D7/61—Additives non-macromolecular inorganic
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/36—Coatings with pigments
    • D21H19/38—Coatings with pigments characterised by the pigments
    • D21H19/385—Oxides, hydroxides or carbonates
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/50—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by form
    • D21H21/52—Additives of definite length or shape
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2004/00—Particle morphology
    • C01P2004/51—Particles with a specific particle size distribution
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2004/00—Particle morphology
    • C01P2004/60—Particles characterised by their size
    • C01P2004/61—Micrometer sized, i.e. from 1-100 micrometer
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2004/00—Particle morphology
    • C01P2004/60—Particles characterised by their size
    • C01P2004/62—Submicrometer sized, i.e. from 0.1-1 micrometer
    • 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
    • C01P2006/12—Surface area
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/34—Silicon-containing compounds

Definitions

  • the present invention relates to a mill for grinding minerals which are used as pigments or fillers.
  • the sand mills' which are most widely used consist of a cylindrical mill body with a vertical axis and a rotor with discs or crowns, the rotor simultaneously moving the grinding elements and the liquid suspension of the material to be ground in the cylinder.
  • the liquid suspension of the material to be ground enters the mill at the bottom and is discharged at the top by means of an overflow.
  • the known grinding elements consist of sand, glass balls, stearite balls, molocite balls, steel balls or nylon balls.
  • the known grinding elements have the disadvantage of contaminating the materials to be ground, due to rapid wear.
  • Another disadvantage of the known grinding elements consists in that they can only be used for suspensions of comparatively low viscosity because of their low specific weight. In other words: with a given type of mill and, for example, glass balls, the concentration of the solids is limited by the viscosity which cannot be exceeded.
  • the grinding elements consist of 30 70% by weight of zirconium oxide, 0.1 5% by weight of aluminium oxide and 5 20% by weight of silicon oxide.
  • Ball mills the balls of which have a diameter of 0.5 cm
  • bead mills the balls of which have a diameter of 0.05 0.5 cm, preferably 0.1 0.25 cm, or sand mills are preferably used.
  • the grinding elements used according to the invention have a smooth surface. Apart from their great hardness and their resistance to abrasion, one of the most important properties of the grinding elements of the invention is their specific weight amounting to 3.5 5, dependent upon the content of zirconium oxide.
  • a mill was charged with 920 kg of grinding elements in the form of balls according to the invention with a diameter of between 1 and 2.5 cm.
  • the material to be ground consisted of an aqueous suspension of chalk with a concentration of 64% solids.
  • the throughput amounted to 1,000 litres/h.
  • a product with 95 98% of particles below 2 microns and a degree of whiteness of 95% Elrepho (blue filter) was obtained.
  • the specific surface of the finished product was found to have increased by 20 25%. It was also found that, in contrast to the use of glass balls, the mill performed with satisfactory regularity and that the ampere value remained constant and no vibration occurred.
  • the increase in the degree of whiteness achieved by using the mill according to the invention can be explained not only by the increase in fineness but also by a substantially lower contamination of the finished product.
  • the wear of the balls used was substantially lower than that of glass balls, as is shown by the following comparison.
  • Balls used according to the invention 0.3 kg/t finished product; glass balls: 1 1.3 kg/t finished product.
  • Another advantage of the present invention consists in the fact that the grinding elements based on zirconium, in contrast to balls of glass or other substances, do not contain metals such as lead, manganese, copper etc. which could lead to contamination of the finished product.
  • a further advantage of the mill according to the invention consists in the possibility of grinding aqueous suspensions of substantially higher viscosities and hence substantially higher solids concentration than with the use of grinding elements of different composition, and this results in a higher throughput while the fineness obtained remains the same.
  • the concentration of solid particles in the material to be ground can be increased to in the process of the invention, whereas in the case of, for example, glass balls, the optimal concentration is about 64%, the fineness achieved being the same in both cases.
  • a further advantage of the mill of the invention consists in that substances of a comparatively high specific weight can be ground such as e.g. barite or various lead salts.
  • a mill for grinding minerals for use as a pigment or filler having grinding elements comprising 30 to 70% by weight of zirconium oxide, 0.] to 5% by weight of aluminium oxide and 5 to 20% by weight of silicon oxide.
  • a process for grinding of a material which comrises grinding said material in a mill having grinding lements comprising 30 to 70% by weight of zirconium xide, 0.1 to 5% by weight of aluminum oxide and 5 to 0% by weight of silicon oxide.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Crushing And Grinding (AREA)
  • Silicates, Zeolites, And Molecular Sieves (AREA)

Abstract

Grinding elements containing 30 to 70% by weight of zirconium oxide, 0.1 to 5% by weight of aluminum oxide and 5 to 20% by weight of silicon oxide, process of grinding and mills containing the grinding elements.

Description

United States Patent [191 Delfosse et al.
Sept. 9, 1975 MILL FOR GRINDING MINERALS Inventors: Pierre Delfosse, Paris, France;
Alfred Bosshard, Oftringen, Switzerland Pluss-Staufer AG, Oftringen, Switzerland Filed: Sept. 27, 1973 Appl. No.: 401,487
Assignee:
Foreign Application Priority Data Oct. 18, 1972 Germany 2251099 US. Cl 241/30; 241/010. 2 Int. Cl. B02c 1/12 Field of Search 241/DIG 2, 30
[56] References Cited UNITED STATES PATENTS 2,316,043 4/1943 Billings ct al. 241/DIG. 2 2,332,701 10/1943 Dowsett 24l/DIG. 2
Primary ExaminerRoy Lake Assistant Examiner-DeWalden W. Jones Attorney, Agent, or Firm-Pollock, Philpitt & Vande Sande [5 7 ABSTRACT Grinding elements containing 30 to 70% by weight of zirconium oxide, 0.1 to 5% by weight of aluminum oxide and 5 to 20% by weight of silicon oxide, process of grinding and mills containing the grinding elements.
20 Claims, 1 Drawing Figure Grinding Eleme t PATH-H5035 3,904,130
Grinding Eleme MILL FOR GRINDING MINERALS The present invention relates to a mill for grinding minerals which are used as pigments or fillers.
It is known to carry out the grinding of mineral products, such as chalk, crystalline calcium carbonate, dolomite, kaolin, lime etc., which are used as pigments or mineral fillers either by dry grinding or by wet grinding. In the last-mentioned case grinding takes place either in ball mills with a horizontal axis, the grinding elements generally consisting of grinding stones of maritime origin or of steel balls, or in mills with a vertical axis, so-called sand mills or bead. mills or, quite generally, in mills with micro grinding elements.
The sand mills'which are most widely used consist of a cylindrical mill body with a vertical axis and a rotor with discs or crowns, the rotor simultaneously moving the grinding elements and the liquid suspension of the material to be ground in the cylinder.
The liquid suspension of the material to be ground enters the mill at the bottom and is discharged at the top by means of an overflow.
The known grinding elements consist of sand, glass balls, stearite balls, molocite balls, steel balls or nylon balls.
Especially in the case where pigments or fillers are to be produced with a high degree of whiteness and high chemical purity, the known grinding elements have the disadvantage of contaminating the materials to be ground, due to rapid wear. Another disadvantage of the known grinding elements consists in that they can only be used for suspensions of comparatively low viscosity because of their low specific weight. In other words: with a given type of mill and, for example, glass balls, the concentration of the solids is limited by the viscosity which cannot be exceeded.
It is therefore a task of the present invention to provide a mill for grinding minerals wherein pigments and fillers can be produced with a high degree of whiteness and fineness and wherein suspensions of high viscosity can be processed.
This task is, solved according to the invention in that the grinding elements consist of 30 70% by weight of zirconium oxide, 0.1 5% by weight of aluminium oxide and 5 20% by weight of silicon oxide.
Ball mills the balls of which have a diameter of 0.5 cm, bead mills the balls of which have a diameter of 0.05 0.5 cm, preferably 0.1 0.25 cm, or sand mills are preferably used.
BRIEF DESCRIPTION OF THE DRAWING The drawing is representative of one type of mill which can employ the grinding elements in accordance with the present invention.
The grinding elements used according to the invention have a smooth surface. Apart from their great hardness and their resistance to abrasion, one of the most important properties of the grinding elements of the invention is their specific weight amounting to 3.5 5, dependent upon the content of zirconium oxide.
With the aid of the grinding elements according to the invention it is now even possible to grind soft minerals (hardness 1 according to Mohs), especially chalk from coccolith shells and talc, in such a way that a specific surface of over 12 sq.m/g is obtained; hitherto this has only been possible in an economically viable way with hard minerals such as Carrara marble, if at all.
Further advantages and features of the invention can be seen from the following example:
A mill was charged with 920 kg of grinding elements in the form of balls according to the invention with a diameter of between 1 and 2.5 cm.
The material to be ground consisted of an aqueous suspension of chalk with a concentration of 64% solids. The throughput amounted to 1,000 litres/h. A product with 95 98% of particles below 2 microns and a degree of whiteness of 95% Elrepho (blue filter) was obtained.
When the mill was operated under the same conditions and with the same chalk but with glass balls, it was only possible to achieve a maximum fineness of 90% of particles below 2 microns and a degree of whiteness of only 93% Elrepho (blue filter).
In comparison with the use of glass balls as grinding elements, the specific surface of the finished product was found to have increased by 20 25%. It was also found that, in contrast to the use of glass balls, the mill performed with satisfactory regularity and that the ampere value remained constant and no vibration occurred.
The increase in the degree of whiteness achieved by using the mill according to the invention can be explained not only by the increase in fineness but also by a substantially lower contamination of the finished product. In fact, the wear of the balls used was substantially lower than that of glass balls, as is shown by the following comparison.
Balls used according to the invention: 0.3 kg/t finished product; glass balls: 1 1.3 kg/t finished product.
Another advantage of the present invention consists in the fact that the grinding elements based on zirconium, in contrast to balls of glass or other substances, do not contain metals such as lead, manganese, copper etc. which could lead to contamination of the finished product.
A further advantage of the mill according to the invention consists in the possibility of grinding aqueous suspensions of substantially higher viscosities and hence substantially higher solids concentration than with the use of grinding elements of different composition, and this results in a higher throughput while the fineness obtained remains the same. On account of the high specific weight of the grinding elements, the concentration of solid particles in the material to be ground can be increased to in the process of the invention, whereas in the case of, for example, glass balls, the optimal concentration is about 64%, the fineness achieved being the same in both cases.
A further advantage of the mill of the invention consists in that substances of a comparatively high specific weight can be ground such as e.g. barite or various lead salts.
What we claim is:
1. A mill for grinding minerals for use as a pigment or filler, the mill having grinding elements comprising 30 to 70% by weight of zirconium oxide, 0.] to 5% by weight of aluminium oxide and 5 to 20% by weight of silicon oxide.
2. A mill according to claim 1 in the form of a ball mill, the grinding elements comprising balls having a diameter of from 0.5 to 10 cm.
3. A mill according to claim 1 in the form of a bead mill, the grinding elements comprising balls having a diameter of from 0.05 to 0.5 cm.
5. The mill of claim 1 wherein said grinding elements omprise balls having a diameter of 0.1 to 0.25 cm.-
6. A process for grinding of a material which comrises grinding said material in a mill having grinding lements comprising 30 to 70% by weight of zirconium xide, 0.1 to 5% by weight of aluminum oxide and 5 to 0% by weight of silicon oxide.
7. The process of claim 6 wherein said grinding eleients comprise balls having a diameter of from 0.5 to 0 cm.
8. The process of claim 7 wherein said material comrises coccolith shells or talc.
9. The process of claim 6 wherein said grinding elelents comprise balls having a diameter of from 0.05 to .5 cm.
10. The process of claim 9 wherein said material smprises coccolith shells or talc.
1 1. The process of claim 6 wherein said grinding elerents have specific weight of 3.5 to 5.
12. The process of claim 11 wherein said material comprises coccolith shells or talc.
13. The process of claim 6 wherein said grinding ele ments comprise balls having a diameter of 0.l to 0.25
14. The process of claim 13 wherein said material 1 comprises coccolith shells or talc.
15. The process of claim 6 wherein said material I j comprisescoccolith shells or talc.
prises balls having a diameter of 0.1 to 0.25 cm.

Claims (20)

1. A MILL FOR GRINDING MINERALS FOR USE AS A PIGMENT OR FILLER, THE MILL HAVING GRINDING ELEMENTS COMPRISING 30 TO 70% BY WEIGHT OF ZIRCONIUM OXIDE 0.1 TO 5% BY WEIGHT OF ALUMINUM OXIDE AND 5 TO 20% BY WEIGHT OF SILICON OXIDE.
2. A mill according to claim 1 in the form of a ball mill, the grinding elements comprising balls having a diameter of from 0.5 to 10 cm.
3. A mill according to claim 1 in the form of a bead mill, the grinding elements comprising balls having a diameter of from 0.05 to 0.5 cm.
4. The mill of claim 1 wherein said grinding elements have a specific weight of 3.5 to 5.
5. The mill of claim 1 wherein said grinding elements comprise balls having a diameter of 0.1 to 0.25 cm.
6. A process for grinding of a material which comprises grinding said material in a mill having grinding elements comprising 30 to 70% by weight of zirconium oxide, 0.1 to 5% by weight of aluminum oxide and 5 to 20% by weight of siLicon oxide.
7. The process of claim 6 wherein said grinding elements comprise balls having a diameter of from 0.5 to 10 cm.
8. The process of claim 7 wherein said material comprises coccolith shells or talc.
9. The process of claim 6 wherein said grinding elements comprise balls having a diameter of from 0.05 to 0.5 cm.
10. The process of claim 9 wherein said material comprises coccolith shells or talc.
11. The process of claim 6 wherein said grinding elements have specific weight of 3.5 to 5.
12. The process of claim 11 wherein said material comprises coccolith shells or talc.
13. The process of claim 6 wherein said grinding elements comprise balls having a diameter of 0.1 to 0.25 cm.
14. The process of claim 13 wherein said material comprises coccolith shells or talc.
15. The process of claim 6 wherein said material comprises coccolith shells or talc.
16. A ground material when produced by a process in accordance claim 15.
17. Grinding element for grinding minerals in a mill comprising 30 to 70% by weight of zirconium oxide, 0.1 to 5% by weight of aluminum oxide and 5 to 20% by weight of silicon oxide.
18. The grinding element of claim 17 comprising balls having a diameter of from 0.5 to 10 cm.
19. The grinding element of claim 17 comprising balls having a diameter of from 0.05 to 0.5 cm.
20. The grinding element of claim 17 which comprises balls having a diameter of 0.1 to 0.25 cm.
US401487A 1972-10-18 1973-09-27 Mill for grinding minerals Expired - Lifetime US3904130A (en)

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4547534A (en) * 1983-03-18 1985-10-15 Memorex Corporation Method to disperse fine solids without size reduction
US4670370A (en) * 1986-04-03 1987-06-02 E. I. Du Pont De Nemours And Company Process for preparation of color liquid toner for electrostatic imaging using carbon steel particulate media
US20040118954A1 (en) * 2001-06-25 2004-06-24 Philippe Artru Method and device for fine grinding of minerals particles
US20090301351A1 (en) * 2005-07-25 2009-12-10 Omya Development Ag Process to disperse and/or grind and/or concentrate calcium carbonate in aqueous media using an aqueous solution containing zirconium compounds
US20100075148A1 (en) * 2005-09-16 2010-03-25 Christian Rainer Process of Manufacturing a Co-Ground Calcium Carbonate Mineral of the Gcc and Pcc Type with a Specific Steepness Factor, Obtained Products and their Uses
US20100074827A1 (en) * 2005-09-16 2010-03-25 Christian Rainer Process of Preparing Mineral Material with Particular Ceria-Containing Zirconium Oxide Grinding Beads, Obtained Products and their Uses
US20110139913A1 (en) * 2009-12-11 2011-06-16 Flsmidth A/S Milling device
US20120282470A1 (en) * 2004-09-21 2012-11-08 Al-Shafei Mansour A Ground particulate spent claus catalyst product
US8647597B1 (en) 2005-09-16 2014-02-11 Omya International Ag Process of preparing mineral material with particular ceria-containing zirconium oxide grinding beads, obtained products and their uses

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2334804B1 (en) 1973-07-09 1975-01-02 Pluss Stauffer Ag Process for the wet grinding of minerals
FI64674C (en) * 1982-04-29 1983-12-12 Ruskealan Marmori Oy FOERFARANDE FOER FRAMSTAELLNING AV EN FYLLNADSMEDELS- OCH / ELLER BELAEGGNINGSPIGMENTBLANDNING FOER PAPPER
JPS6287414A (en) * 1985-10-14 1987-04-21 Oji Paper Co Ltd Method of treating ground limestone for paper making
GB2257379B (en) * 1991-07-09 1995-04-19 Ecc Int Ltd Comminution in a planetary mill
EP0577889B1 (en) * 1992-07-07 1997-09-17 Ecc International Limited Differential grinding

Citations (2)

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Publication number Priority date Publication date Assignee Title
US2316043A (en) * 1939-01-30 1943-04-06 Cabot Godfrey L Inc Treatment of pigments or the like
US2332701A (en) * 1940-06-12 1943-10-26 Charles W Dowsett System and method of grinding

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1671080A1 (en) * 1965-05-25 1971-08-12 Schmitz Ralf Guenther Mahlkoerper and linings for ball mills and the like. for iron- or metal-free grinding of raw materials and processes for their production

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2316043A (en) * 1939-01-30 1943-04-06 Cabot Godfrey L Inc Treatment of pigments or the like
US2332701A (en) * 1940-06-12 1943-10-26 Charles W Dowsett System and method of grinding

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4547534A (en) * 1983-03-18 1985-10-15 Memorex Corporation Method to disperse fine solids without size reduction
US4670370A (en) * 1986-04-03 1987-06-02 E. I. Du Pont De Nemours And Company Process for preparation of color liquid toner for electrostatic imaging using carbon steel particulate media
US20040118954A1 (en) * 2001-06-25 2004-06-24 Philippe Artru Method and device for fine grinding of minerals particles
US7093782B2 (en) * 2001-06-25 2006-08-22 Wheelabrator-Allevard Method and device for fine grinding of mineral particles
US10301216B2 (en) * 2004-09-21 2019-05-28 Saudi Arabian Oil Company Ground particulate spent Claus catalyst product
US20120282470A1 (en) * 2004-09-21 2012-11-08 Al-Shafei Mansour A Ground particulate spent claus catalyst product
US20110192323A1 (en) * 2005-07-25 2011-08-11 Mathias Buri Process to disperse and / or grind and / or concentrate calcium carbonate in aqueous media using an aqueous solution containing zirconium compounds
US8845804B2 (en) 2005-07-25 2014-09-30 Omya International Ag Process to disperse and/or grind and/or concentrate calcium carbonate in aqueous media using an aqueous solution containing zirconium compounds
US9574088B2 (en) 2005-07-25 2017-02-21 Omya International Ag Process to disperse and / or grind and / or concentrate calcium carbonate in aqueous media using an aqueous solution containing zirconium compounds
US9617430B2 (en) 2005-07-25 2017-04-11 Omya International Ag Process to disperse and/or grind and/or concentrate calcium carbonate in aqueous media using an aqueous solution containing zirconium compounds
EP3235879A1 (en) * 2005-07-25 2017-10-25 Omya International AG Process to disperse and / or grind and / or concentrate calcium carbonate in aqueous media using an aqueous solution containing zirconium compounds
US20090301351A1 (en) * 2005-07-25 2009-12-10 Omya Development Ag Process to disperse and/or grind and/or concentrate calcium carbonate in aqueous media using an aqueous solution containing zirconium compounds
US20100074827A1 (en) * 2005-09-16 2010-03-25 Christian Rainer Process of Preparing Mineral Material with Particular Ceria-Containing Zirconium Oxide Grinding Beads, Obtained Products and their Uses
US20100075148A1 (en) * 2005-09-16 2010-03-25 Christian Rainer Process of Manufacturing a Co-Ground Calcium Carbonate Mineral of the Gcc and Pcc Type with a Specific Steepness Factor, Obtained Products and their Uses
US8517291B2 (en) 2005-09-16 2013-08-27 Omya International Ag Process of manufacturing a co-ground calcium carbonate mineral of the GCC and PCC type with a specific steepness factor, obtained products and their uses
US8591853B2 (en) 2005-09-16 2013-11-26 Omya International Ag Process of preparing mineral material with particular ceria-containing zirconium oxide grinding beads, obtained products and their uses
US8647597B1 (en) 2005-09-16 2014-02-11 Omya International Ag Process of preparing mineral material with particular ceria-containing zirconium oxide grinding beads, obtained products and their uses
US20110139913A1 (en) * 2009-12-11 2011-06-16 Flsmidth A/S Milling device
US8091817B2 (en) 2009-12-11 2012-01-10 Flsmidth A/S Milling device

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Publication number Publication date
DE2251099A1 (en) 1974-05-02
FR2203681A1 (en) 1974-05-17
GB1387100A (en) 1975-03-12
DE2251099B2 (en) 1978-06-29
FR2203681B1 (en) 1976-06-18
DE2251099C3 (en) 1979-02-22

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