Process for making ferrite spherical particulate toner core from raw fly ash

Patent · Tue Oct 06 00:00:00 EDT 1987

OSTI ID:5951495

Aldrich, R G; Earl, G H; Trunko, D W

This patent describes a process for making a ferrite spherical particulate toner carrier core from raw fly ash obtained from burning coal comprising (a) recovering the magnetic particles from the non-magnetic particles of the raw fly ash; (b) selecting a desired size for the particles of the raw fly ash and screening the fly ash to obtain the desired sized particles; and (c) purifying the raw fly ash treated according to steps (a) and (b) to obtain a ferrite composition having a particle size from 20-300 microns, in which the particles are essentially spherical, having an apparent density of at least 1.8 g/cm/sup 3/; a saturation magnetization of 43-70 emu/g; a remanence of 5 emu/g or less; a Hall Flow of 20 sec. or greater/50 g.

• Assignee: Halomet Inc., Syracuse, NY
• Patent Number(s): US 4698289
• OSTI ID: 5951495
• Resource Relation: Patent File Date: Filed date 27 Feb 1986
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
FLY ASH
WASTE PRODUCT UTILIZATION
CHEMICAL PREPARATION
COAL
COMBUSTION PRODUCTS
DENSITY
FERRITE
HALL EFFECT
MAGNETIC PROPERTIES
MATERIALS RECOVERY
PARTICLE SIZE CLASSIFIERS
PARTICULATES
PURIFICATION
SEPARATION PROCESSES
SPHERES
SPHERICAL CONFIGURATION
AEROSOL WASTES
ALLOYS
ASHES
CARBON ADDITIONS
CARBONACEOUS MATERIALS
CONFIGURATION
ENERGY SOURCES
EQUIPMENT
FOSSIL FUELS
FUELS
IRON ALLOYS
MANAGEMENT
MATERIALS
PARTICLES
PHYSICAL PROPERTIES
PROCESSING
RECOVERY
RESIDUES
SYNTHESIS
WASTE MANAGEMENT
WASTE PROCESSING
WASTES
010800* - Coal
Lignite
& Peat- Waste Management
400201 - Chemical & Physicochemical Properties