JPS5484894A - Method of preparing alpha-iron oxyhydroxide - Google Patents
Method of preparing alpha-iron oxyhydroxideInfo
- Publication number
- JPS5484894A JPS5484894A JP15265277A JP15265277A JPS5484894A JP S5484894 A JPS5484894 A JP S5484894A JP 15265277 A JP15265277 A JP 15265277A JP 15265277 A JP15265277 A JP 15265277A JP S5484894 A JPS5484894 A JP S5484894A
- Authority
- JP
- Japan
- Prior art keywords
- ferric
- aging
- less
- reacting liquid
- solution
- 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
Links
Landscapes
- Compounds Of Iron (AREA)
- Manufacture Of Metal Powder And Suspensions Thereof (AREA)
- Hard Magnetic Materials (AREA)
Abstract
PURPOSE: To prepare α-hydroxy iron hydroxide suitable for a material of powdery magnetic iron hydroxide for magnetic recording medium through addition of a solution of ferric salt to a caustic alkaline solution until a specified value of pH is obtained and subsequent aging of the reacting liquid with the value of pH maintained.
CONSTITUTION: A specified amount of a solution of ferric salt, such as ferric sulfate, ferric chlorate and ferric nitrate, with a concentration of 0.5 mol/l or less is added to a high concentration alkaline solution of NaOH or KOH slowly with stirring until the pH of the reacting liquid after the addition reaches 10.5 to 12.5. Then, the reacting liquid containing the resulting precipitate is allowed to stand at room temperature for about 200 hours for aging. Consequently, the crystallization of uniform α-FeOOH excellent in needle property is observed. The aging time herein may be shortened according to the temperature of heating. For example, the aging can be performed at 80°C or less for ferric sulfate of ferric chlorate and 60°C or less for ferric nitrate.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15265277A JPS5484894A (en) | 1977-12-19 | 1977-12-19 | Method of preparing alpha-iron oxyhydroxide |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15265277A JPS5484894A (en) | 1977-12-19 | 1977-12-19 | Method of preparing alpha-iron oxyhydroxide |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5484894A true JPS5484894A (en) | 1979-07-06 |
| JPS554695B2 JPS554695B2 (en) | 1980-01-31 |
Family
ID=15545096
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15265277A Granted JPS5484894A (en) | 1977-12-19 | 1977-12-19 | Method of preparing alpha-iron oxyhydroxide |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5484894A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59119704A (en) * | 1982-12-24 | 1984-07-11 | Sony Corp | Manufacture of acicular goethite |
| WO2000038181A1 (en) * | 1998-12-18 | 2000-06-29 | Dowa Mining Co., Ltd. | Underlayer powder for coating-type magnetic recording media and process for producing the same |
-
1977
- 1977-12-19 JP JP15265277A patent/JPS5484894A/en active Granted
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59119704A (en) * | 1982-12-24 | 1984-07-11 | Sony Corp | Manufacture of acicular goethite |
| WO2000038181A1 (en) * | 1998-12-18 | 2000-06-29 | Dowa Mining Co., Ltd. | Underlayer powder for coating-type magnetic recording media and process for producing the same |
| US6440545B1 (en) | 1998-12-18 | 2002-08-27 | Dowa Mining Co., Ltd. | Powder for use in lower layer of coating type magnetic recording medium |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS554695B2 (en) | 1980-01-31 |
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