Title:
酸化鉄粒子粉末
Document Type and Number:
Japanese Patent JP3600754
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To obtain iron oxide particulate powder having high fluidity and low packing density and excellent in magnetic characteristics by mixing spherical iron oxide particles and octahedral iron oxide particles. SOLUTION: The iron oxide particles are preferably based on magnetite and may contain various effective elements such as Si, Al and Ti. Spherical or octahedral magnetite particles are obtained by controlling pH in the oxidation of ferrous hydroxide. The number average particle diameter of magnetite particulate powder is 0.15-0.5 μm, the existence number proportion of the octahedral magnetite particles to the total number is 5-90%, and when the average particle diameter of the spherical magnetite particles is represented by X (μm), the average particle diameter of the octahedral magnetite particles by Y (μm) and the existence number proportion of the octahedral magnetite particles by Z (%), the formula is preferably satisfied. The magnetite particulate powder preferably has <=1.4 g/cm3 tap density, <=8 emu/g residual magnetization (σr) in an external magnetic field of 5 kOe or 1 kOe and <=42 deg. angle of repose.
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Inventors:
Takeshi Miyazono
Katsuhiko Yoshimaru
Katsuhiko Yoshimaru
Application Number:
JP12504299A
Publication Date:
December 15, 2004
Filing Date:
April 30, 1999
Export Citation:
Assignee:
Mitsui Mining & Smelting Co., Ltd.
International Classes:
C01G49/08; C09C1/24; C09D7/12; G03G9/083; G03G9/107; (IPC1-7): C01G49/08; C09C1/24; C09D7/12; G03G9/083; G03G9/107
Domestic Patent References:
| JP3201509A | ||||
| JP4170325A | ||||
| JP7240306A | ||||
| JP10072218A | ||||
| JP5213620A |
Attorney, Agent or Firm:
Osamu Hatori