GB1481711A - Spherical void-free particle formation in spray-dried ferrites - Google Patents

Spherical void-free particle formation in spray-dried ferrites

Info

Publication number
GB1481711A
GB1481711A GB49374/74A GB4937474A GB1481711A GB 1481711 A GB1481711 A GB 1481711A GB 49374/74 A GB49374/74 A GB 49374/74A GB 4937474 A GB4937474 A GB 4937474A GB 1481711 A GB1481711 A GB 1481711A
Authority
GB
United Kingdom
Prior art keywords
slurry
ferrites
added
ferrite
bead
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.)
Expired
Application number
GB49374/74A
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.)
Xerox Corp
Original Assignee
Xerox Corp
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 Xerox Corp filed Critical Xerox Corp
Publication of GB1481711A publication Critical patent/GB1481711A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
    • B01J2/02—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic by dividing the liquid material into drops, e.g. by spraying, and solidifying the drops
    • B01J2/04—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic by dividing the liquid material into drops, e.g. by spraying, and solidifying the drops in a gaseous medium
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G9/00—Developers
    • G03G9/08—Developers with toner particles
    • G03G9/10—Developers with toner particles characterised by carrier particles
    • G03G9/107—Developers with toner particles characterised by carrier particles having magnetic components
    • G03G9/1075—Structural characteristics of the carrier particles, e.g. shape or crystallographic structure
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G9/00—Developers
    • G03G9/08—Developers with toner particles
    • G03G9/10—Developers with toner particles characterised by carrier particles
    • G03G9/107—Developers with toner particles characterised by carrier particles having magnetic components
    • G03G9/108—Ferrite carrier, e.g. magnetite
    • G03G9/1085—Ferrite carrier, e.g. magnetite with non-ferrous metal oxide, e.g. MgO-Fe2O3
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
    • H01F1/34—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials non-metallic substances, e.g. ferrites
    • H01F1/36—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials non-metallic substances, e.g. ferrites in the form of particles

Landscapes

  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Organic Chemistry (AREA)
  • Dispersion Chemistry (AREA)
  • Developing Agents For Electrophotography (AREA)
  • Compounds Of Iron (AREA)
  • Catalysts (AREA)
  • Oxygen, Ozone, And Oxides In General (AREA)
  • Inorganic Compounds Of Heavy Metals (AREA)
  • Magnetic Ceramics (AREA)
  • Soft Magnetic Materials (AREA)

Abstract

1481711 Ferrites XEROX CORP 14 Nov 1974 [12 Dec 1973] 49374/74 Headings C1J and C1A [Also in Division G2] Ferrite (e.g. NiZn and MnZn ferrites or Fe 3 O 4 ) particles which are substantially spherical in shape, continuous in surface area and free of interior voids are made by preparing a slurry of ferrite-forming metal oxides in a liquid, the slurry having a viscosity at 23‹ C of between 55,000 and 140,000 centipoise, spray-drying to form substantially spherical metal oxide beads and sintering. The metal oxides may either be added to the liquid before mixing to form the slurry or may be mixed dry before addition to the liquid to form the slurry. A flow-promoting ingredient (e.g. zirconia or alumina) may be added to the metal oxide beads to prevent bead-to-bead agglomeration and bead-to-furnace-wall sticking. A deflocculent (various acids and salts are exemplified) may be added to the slurry. A binder may also be present in the slurry. Examples describe the preparation of Ni ferrites using a deflocculent in the slurry. The ferrite particles may act as electrostatographic carrier materials, toner particles (of which many are exemplified) being capable of electrostatically clinging thereto.
GB49374/74A 1973-12-12 1974-11-14 Spherical void-free particle formation in spray-dried ferrites Expired GB1481711A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US42414673A 1973-12-12 1973-12-12

Publications (1)

Publication Number Publication Date
GB1481711A true GB1481711A (en) 1977-08-03

Family

ID=23681631

Family Applications (1)

Application Number Title Priority Date Filing Date
GB49374/74A Expired GB1481711A (en) 1973-12-12 1974-11-14 Spherical void-free particle formation in spray-dried ferrites

Country Status (10)

Country Link
JP (1) JPS5090996A (en)
BR (1) BR7409417A (en)
CA (1) CA1054837A (en)
DE (1) DE2452671C3 (en)
ES (1) ES432203A1 (en)
FR (1) FR2254536B1 (en)
GB (1) GB1481711A (en)
IT (1) IT1026878B (en)
NL (1) NL7415657A (en)
SE (1) SE397887B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000030978A1 (en) * 1998-11-26 2000-06-02 Commissariat A L'energie Atomique Preparation by spray-drying of a flowable uranium dioxide powder obtained by dry process conversion of uf¿6?

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
MX146295A (en) * 1975-10-29 1982-06-03 Xerox Corp IMPROVED METHOD FOR PRODUCING HUMIDITY INSENSITIVE AND COATED FERRITE PARTICLES
FR2389968B1 (en) * 1977-05-02 1983-02-04 Burroughs Corp
JPS58145625A (en) * 1982-02-12 1983-08-30 Tdk Corp Magnetic carrier particle
JPS58145622A (en) * 1982-02-12 1983-08-30 Tdk Corp Magnetic carrier particle
US4480093A (en) * 1983-05-23 1984-10-30 Borg-Warner Chemicals, Inc. Amines salts of phosphoric acid
JPS60458A (en) * 1983-06-09 1985-01-05 Kanto Denka Kogyo Kk Carrier for electrophotography
JPS6060930A (en) * 1983-09-13 1985-04-08 Dowa Mining Co Ltd Manufacture of spherical ferrite powder
DE3809694A1 (en) * 1988-03-23 1989-10-05 Hoechst Ceram Tec Ag METHOD FOR PRODUCING A RELEASE AGENT FOR MULTI-LAYER BURNING CERAMIC FILMS
JP2743009B2 (en) * 1989-04-19 1998-04-22 戸田工業株式会社 Ferrite particle powder for bond core and method for producing the same
DE69012398T2 (en) * 1989-04-19 1995-02-02 Toda Kogyo Corp Ferrite particles and ferrite-resin composite for bonded magnetic core and process for their manufacture.

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000030978A1 (en) * 1998-11-26 2000-06-02 Commissariat A L'energie Atomique Preparation by spray-drying of a flowable uranium dioxide powder obtained by dry process conversion of uf¿6?
FR2786479A1 (en) * 1998-11-26 2000-06-02 Commissariat Energie Atomique PREPARATION BY ATOMIZATION-DRYING OF A CASTABLE POWDER OF URANIUM BIOXIDE OBTAINED BY DRY CONVERSION OF UF6
US6656391B1 (en) 1998-11-26 2003-12-02 Commissariat A L'energie Atomique Preparation by spray-drying of a flowable uranium dioxide powder obtained by dry process conversion of UF6

Also Published As

Publication number Publication date
CA1054837A (en) 1979-05-22
NL7415657A (en) 1975-03-27
DE2452671A1 (en) 1975-06-26
DE2452671C3 (en) 1979-12-20
DE2452671B2 (en) 1979-04-12
SE7415379L (en) 1975-06-13
ES432203A1 (en) 1977-02-16
BR7409417A (en) 1976-05-18
SE397887B (en) 1977-11-21
IT1026878B (en) 1978-10-20
FR2254536B1 (en) 1982-04-16
FR2254536A1 (en) 1975-07-11
JPS5090996A (en) 1975-07-21

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
746 Register noted 'licences of right' (sect. 46/1977)
PCNP Patent ceased through non-payment of renewal fee