JPS5626731A - Manufacture of needle crystal magnetic iron oxide particle powder containing co - Google Patents

Manufacture of needle crystal magnetic iron oxide particle powder containing co

Info

Publication number
JPS5626731A
JPS5626731A JP10093579A JP10093579A JPS5626731A JP S5626731 A JPS5626731 A JP S5626731A JP 10093579 A JP10093579 A JP 10093579A JP 10093579 A JP10093579 A JP 10093579A JP S5626731 A JPS5626731 A JP S5626731A
Authority
JP
Japan
Prior art keywords
soln
aqueous
particles
needle crystal
water soluble
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.)
Granted
Application number
JP10093579A
Other languages
Japanese (ja)
Other versions
JPS6015571B2 (en
Inventor
Nanao Horiishi
Atsushi Takedoi
Akira Mukozaka
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.)
Toda Kogyo Corp
Original Assignee
Toda Kogyo 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 Toda Kogyo Corp filed Critical Toda Kogyo Corp
Priority to JP54100935A priority Critical patent/JPS6015571B2/en
Publication of JPS5626731A publication Critical patent/JPS5626731A/en
Publication of JPS6015571B2 publication Critical patent/JPS6015571B2/en
Expired legal-status Critical Current

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  • Compounds Of Iron (AREA)
  • Hard Magnetic Materials (AREA)

Abstract

PURPOSE: To obtain the titled powder having uniform particle size and free from resinous particles by adding water soluble silicate to an aqueous soln. prepared by reacting an aqueous ferrous salt soln. and an aqueous soln. of water soluble Co salt, oxidizing the silicate-added soln., and heat treating the resulting particles.
CONSTITUTION: An aqueous ferrous salt soln. and an aqueous soln. of water soluble Co salt are reacted with an aqueous alkali soln. to prepare a mixed aqueous soln. of ≥12pH contg. Fe(OH)2 and Co(OH)2, and to this soln. is added water soluble silicate by 0.1W1.1 atomic% as Si to the total amount of the metals in the soln. This mixed soln. is oxidized by blowing oxygen-contg. gas to form Co-contg. needle crystal goethite particles. The particles are then separated by filtration, washed, dried, heat dehydrated, heat calcined under an atmosphere of heated steam and nonreducing gas, and heat reduced to obtain needle crystal magnetite particles, which may further be oxidized to give needle crystal maghemite particles.
COPYRIGHT: (C)1981,JPO&Japio
JP54100935A 1979-08-07 1979-08-07 Method for producing Co-containing acicular magnetic iron oxide particles Expired JPS6015571B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP54100935A JPS6015571B2 (en) 1979-08-07 1979-08-07 Method for producing Co-containing acicular magnetic iron oxide particles

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP54100935A JPS6015571B2 (en) 1979-08-07 1979-08-07 Method for producing Co-containing acicular magnetic iron oxide particles

Publications (2)

Publication Number Publication Date
JPS5626731A true JPS5626731A (en) 1981-03-14
JPS6015571B2 JPS6015571B2 (en) 1985-04-20

Family

ID=14287201

Family Applications (1)

Application Number Title Priority Date Filing Date
JP54100935A Expired JPS6015571B2 (en) 1979-08-07 1979-08-07 Method for producing Co-containing acicular magnetic iron oxide particles

Country Status (1)

Country Link
JP (1) JPS6015571B2 (en)

Also Published As

Publication number Publication date
JPS6015571B2 (en) 1985-04-20

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