JPS5626730A - Manufacture of needle crystal magnetic iron oxide particle powder - Google Patents

Manufacture of needle crystal magnetic iron oxide particle powder

Info

Publication number
JPS5626730A
JPS5626730A JP10188679A JP10188679A JPS5626730A JP S5626730 A JPS5626730 A JP S5626730A JP 10188679 A JP10188679 A JP 10188679A JP 10188679 A JP10188679 A JP 10188679A JP S5626730 A JPS5626730 A JP S5626730A
Authority
JP
Japan
Prior art keywords
soln
particles
aqueous
needle crystal
heat
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
JP10188679A
Other languages
Japanese (ja)
Other versions
JPS5950607B2 (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 JP54101886A priority Critical patent/JPS5950607B2/en
Publication of JPS5626730A publication Critical patent/JPS5626730A/en
Publication of JPS5950607B2 publication Critical patent/JPS5950607B2/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 reacting an aqueous alkali soln. contg. water-soluble silicate with an aqueous ferrous salt soln., oxidizing the reaction product, and heat treating the resulting particles.
CONSTITUTION: Water-soluble silicate is previously added to an aqueous alkali soln. used to prepare an aqueous soln. of ≥11pH contg. Fe(OH)2 by 0.1W17 atomic% as Si to the amount of Fe. This alkali soln. is reacted with an aqueous ferrous salt soln. to prepare an aqueous soln. of ≥11pH contg. fine uniform Fe(OH)2, and by oxidizing the soln. needle crystal goethite particles are formed. 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
JP54101886A 1979-08-09 1979-08-09 Method for producing acicular magnetic iron oxide particles Expired JPS5950607B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP54101886A JPS5950607B2 (en) 1979-08-09 1979-08-09 Method for producing acicular magnetic iron oxide particles

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP54101886A JPS5950607B2 (en) 1979-08-09 1979-08-09 Method for producing acicular magnetic iron oxide particles

Publications (2)

Publication Number Publication Date
JPS5626730A true JPS5626730A (en) 1981-03-14
JPS5950607B2 JPS5950607B2 (en) 1984-12-10

Family

ID=14312411

Family Applications (1)

Application Number Title Priority Date Filing Date
JP54101886A Expired JPS5950607B2 (en) 1979-08-09 1979-08-09 Method for producing acicular magnetic iron oxide particles

Country Status (1)

Country Link
JP (1) JPS5950607B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5228809A (en) * 1989-01-27 1993-07-20 Kajima Corporation Consolidating agent injecting apparatus and injecting apparatus for improving ground
US5338355A (en) * 1992-12-23 1994-08-16 Bayer Ag Method of preparing goethite

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5228809A (en) * 1989-01-27 1993-07-20 Kajima Corporation Consolidating agent injecting apparatus and injecting apparatus for improving ground
US5338355A (en) * 1992-12-23 1994-08-16 Bayer Ag Method of preparing goethite

Also Published As

Publication number Publication date
JPS5950607B2 (en) 1984-12-10

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