JPS5469594A - Production of ferric oxide and magnetic material - Google Patents

Production of ferric oxide and magnetic material

Info

Publication number
JPS5469594A
JPS5469594A JP13708777A JP13708777A JPS5469594A JP S5469594 A JPS5469594 A JP S5469594A JP 13708777 A JP13708777 A JP 13708777A JP 13708777 A JP13708777 A JP 13708777A JP S5469594 A JPS5469594 A JP S5469594A
Authority
JP
Japan
Prior art keywords
slurry
esp
citric acid
contg
magnetic material
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
JP13708777A
Other languages
Japanese (ja)
Other versions
JPS5522416B2 (en
Inventor
Seiji Matsumoto
Tadashi Shoka
Kiyoshi Fukai
Shinya Nakatani
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.)
Sakai Chemical Industry Co Ltd
Original Assignee
Sakai Chemical Industry Co Ltd
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 Sakai Chemical Industry Co Ltd filed Critical Sakai Chemical Industry Co Ltd
Priority to JP13708777A priority Critical patent/JPS5469594A/en
Priority to US05/957,861 priority patent/US4202871A/en
Priority to DE2849173A priority patent/DE2849173C2/en
Publication of JPS5469594A publication Critical patent/JPS5469594A/en
Publication of JPS5522416B2 publication Critical patent/JPS5522416B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Compounds Of Iron (AREA)
  • Paints Or Removers (AREA)
  • Hard Magnetic Materials (AREA)

Abstract

PURPOSE: To obtain a magnetic material with no hole and superior magnetic characteristics, e.g. needle-like magnetite, by heat treating a slurry contg. ferric hydroxide, citric acid (salt) and an alkali cpd. in a predetermined pH range at a specific temp.
CONSTITUTION: An aq. slurry is prepared contg. purified ferric hydroxide and 0.0006W3, esp. 0.004W0.6 mol (as citric acid) of citric acid and/or its salt to the iron atoms of the hydroxide. To the slurry is added an alkali cpd. such as NsOH so that the pH of the resulting slurry becomes 10W13, esp. 11W12.5 at 25°C. The slurry contg. the three components is heat treated at 100W250, esp. 130W190°C to precipitate needle-like α-Fe2O3, which is then recovered. The α-Fe2O3 is reduced and reoxidized if desired to obtain iron oxide base magnetic particles with superior magnetic characteristics and good dispersibility.
COPYRIGHT: (C)1979,JPO&Japio
JP13708777A 1977-11-14 1977-11-14 Production of ferric oxide and magnetic material Granted JPS5469594A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP13708777A JPS5469594A (en) 1977-11-14 1977-11-14 Production of ferric oxide and magnetic material
US05/957,861 US4202871A (en) 1977-11-14 1978-11-06 Production of acicular ferric oxide
DE2849173A DE2849173C2 (en) 1977-11-14 1978-11-13 Process for the preparation of needle-shaped α-iron-III-oxide particles and their use

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13708777A JPS5469594A (en) 1977-11-14 1977-11-14 Production of ferric oxide and magnetic material

Related Child Applications (1)

Application Number Title Priority Date Filing Date
JP225080A Division JPS5595627A (en) 1980-01-12 1980-01-12 Manufacture of magnetic material

Publications (2)

Publication Number Publication Date
JPS5469594A true JPS5469594A (en) 1979-06-04
JPS5522416B2 JPS5522416B2 (en) 1980-06-17

Family

ID=15190570

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13708777A Granted JPS5469594A (en) 1977-11-14 1977-11-14 Production of ferric oxide and magnetic material

Country Status (1)

Country Link
JP (1) JPS5469594A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57123831A (en) * 1981-01-20 1982-08-02 Sakai Chem Ind Co Ltd Preparation of magnetic iron oxide powder
JPH0438809A (en) * 1990-06-04 1992-02-10 Agency Of Ind Science & Technol Light-transmissive magnetic iron oxide film and manufacture thereof

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57123831A (en) * 1981-01-20 1982-08-02 Sakai Chem Ind Co Ltd Preparation of magnetic iron oxide powder
JPS6029646B2 (en) * 1981-01-20 1985-07-11 堺化学工業株式会社 Method for producing magnetic iron oxide powder
JPH0438809A (en) * 1990-06-04 1992-02-10 Agency Of Ind Science & Technol Light-transmissive magnetic iron oxide film and manufacture thereof

Also Published As

Publication number Publication date
JPS5522416B2 (en) 1980-06-17

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