JPS5818904A - Preparation of magnetic iron oxide containing cobalt - Google Patents
Preparation of magnetic iron oxide containing cobaltInfo
- Publication number
- JPS5818904A JPS5818904A JP56117363A JP11736381A JPS5818904A JP S5818904 A JPS5818904 A JP S5818904A JP 56117363 A JP56117363 A JP 56117363A JP 11736381 A JP11736381 A JP 11736381A JP S5818904 A JPS5818904 A JP S5818904A
- Authority
- JP
- Japan
- Prior art keywords
- iron oxide
- temperature
- cobalt
- magnetite
- compound
- 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
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 title claims abstract description 90
- 229910017052 cobalt Inorganic materials 0.000 title claims abstract description 20
- 239000010941 cobalt Substances 0.000 title claims abstract description 20
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 title claims abstract description 20
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 claims abstract description 21
- 238000000151 deposition Methods 0.000 claims abstract description 11
- 150000002736 metal compounds Chemical class 0.000 claims abstract description 9
- 230000001590 oxidative effect Effects 0.000 claims abstract description 9
- 239000002184 metal Substances 0.000 claims description 6
- 229910052751 metal Inorganic materials 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 238000007254 oxidation reaction Methods 0.000 abstract description 12
- 230000003647 oxidation Effects 0.000 abstract description 11
- 230000000694 effects Effects 0.000 abstract description 6
- 150000001875 compounds Chemical class 0.000 abstract description 5
- 239000012736 aqueous medium Substances 0.000 abstract description 3
- 235000013980 iron oxide Nutrition 0.000 description 19
- 150000001869 cobalt compounds Chemical class 0.000 description 13
- 238000000034 method Methods 0.000 description 9
- 239000002002 slurry Substances 0.000 description 9
- 239000003513 alkali Substances 0.000 description 5
- 150000001868 cobalt Chemical class 0.000 description 4
- 239000007789 gas Substances 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical class [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 238000009835 boiling Methods 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 229910000361 cobalt sulfate Inorganic materials 0.000 description 2
- 229940044175 cobalt sulfate Drugs 0.000 description 2
- KTVIXTQDYHMGHF-UHFFFAOYSA-L cobalt(2+) sulfate Chemical compound [Co+2].[O-]S([O-])(=O)=O KTVIXTQDYHMGHF-UHFFFAOYSA-L 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 235000013305 food Nutrition 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- 229910001369 Brass Inorganic materials 0.000 description 1
- 241000016649 Copaifera officinalis Species 0.000 description 1
- 239000004859 Copal Substances 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- JZQOJFLIJNRDHK-CMDGGOBGSA-N alpha-irone Chemical compound CC1CC=C(C)C(\C=C\C(C)=O)C1(C)C JZQOJFLIJNRDHK-CMDGGOBGSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 229910000428 cobalt oxide Inorganic materials 0.000 description 1
- IVMYJDGYRUAWML-UHFFFAOYSA-N cobalt(ii) oxide Chemical compound [Co]=O IVMYJDGYRUAWML-UHFFFAOYSA-N 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 150000004679 hydroxides Chemical class 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229910000358 iron sulfate Inorganic materials 0.000 description 1
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 description 1
- VBMVTYDPPZVILR-UHFFFAOYSA-N iron(2+);oxygen(2-) Chemical class [O-2].[Fe+2] VBMVTYDPPZVILR-UHFFFAOYSA-N 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 235000011007 phosphoric acid Nutrition 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000002243 precursor Substances 0.000 description 1
- 239000012266 salt solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/62—Record carriers characterised by the selection of the material
- G11B5/68—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent
- G11B5/70—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer
- G11B5/706—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the composition of the magnetic material
- G11B5/70626—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the composition of the magnetic material containing non-metallic substances
- G11B5/70642—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the composition of the magnetic material containing non-metallic substances iron oxides
- G11B5/70652—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the composition of the magnetic material containing non-metallic substances iron oxides gamma - Fe2 O3
- G11B5/70668—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the composition of the magnetic material containing non-metallic substances iron oxides gamma - Fe2 O3 containing a dopant
- G11B5/70673—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the composition of the magnetic material containing non-metallic substances iron oxides gamma - Fe2 O3 containing a dopant containing Co
Landscapes
- Compounds Of Iron (AREA)
- Paints Or Removers (AREA)
- Magnetic Record Carriers (AREA)
- Hard Magnetic Materials (AREA)
Abstract
Description
【発明の詳細な説明】
本発明、は主にビデオ用、オーディオ用の磁気記鍮諜体
用Ｏ記鍮嵩子として有用なコバルト含有磁性酸化鉄の工
業的な製造方法に関するものである。本方法により得ら
れるプパルト含有磁性酸化鉄拡高い保磁力を有し、且つ
温度安定性がよいもＯである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an industrial method for producing cobalt-containing magnetic iron oxide, which is useful as an O-recording brass filler for magnetic recording media mainly for video and audio applications. The Pupart-containing magnetic iron oxide obtained by this method has high coercive force and good temperature stability.
従来、良好な磁気特性を有するコバルト含有磁性酸化鉄
を得る九めＫｒ−酸化鉄にコバルト化食物、又はプパル
ト化会物シよび働Ｏ金属化会物を被着させる方法社多く
知られている。ζｔｂｏ方法においてｒ−酸化鉄紘、そ
０前駆体で番るマグネタイトを酸化性ガスによ〉酸化し
て製造している。マグネタイトをＴ−酸化鉄に酸化する
公知文献としては例えば特’Ａ＠＊＠−７７１６がある
。ζ０１１１記の項に、酸化温度はＳＯＯ〜１１０Ｇ’
Ｆ（１４９〜４＄意℃）と記載されているが、該１ｉＪ
ｌｌ書にｌ１ｌｒ−酸化鉄にプパ→ト化合物を被着する
場合に適し九マダネタイトの酸化温度については記載さ
れていない。ｒ−酸化鉄にコバルト化合物を被着する場
合は、！ダネタイ）０酸化は例えば特開１１５２−Ｉｓ
ｓ１１に記載されているように、一般Ｋ ８６０℃前後
で行われている。Conventionally, many methods have been known to obtain cobalt-containing magnetic iron oxides with good magnetic properties by depositing cobaltized foods, or pupardium compounds, and iron metal compounds on Kr-iron oxide. . In the ζtbo method, it is produced by oxidizing magnetite using an r-iron oxide precursor with an oxidizing gas. As a known document on oxidizing magnetite to T-iron oxide, there is, for example, Toku'A@*@-7716. In the section ζ0111, the oxidation temperature is SOO~110G'
F (149 to 4 degrees Celsius), but the 1iJ
The 11 book does not describe the oxidation temperature of madanetite, which is suitable for applying a pupato compound to l1lr-iron oxide. When applying a cobalt compound to r-iron oxide,! For example, JP-A No. 1152-Is
As described in s11, it is generally carried out at a temperature of around 860°C.
本発明者達は、保磁力が高く、シか４甑変安定性のよい
嵐好な磁気特性を有するコバルト含有磁性酸化鉄を得べ
く、マグネタイトなｒ−酸化鉄に酸化する条件について
種々検討し丸。そめ結果、マグネタイトを従来技術より
低温の１２２０℃を越えない温度で酸化すると、表面活
性が高く、水系媒液での分散性が優れ、コバルト等の金
属化合物と附着しゃすいｒ−酸化鉄が得られ、とのｒ−
酸化鉄にコバルト化合物、又はコバルト化合物および他
の金属化合物を被着し九コバルト含有磁性酸化鉄は高い
保磁力を有し、温度安定性がよいことがわか夛本発明を
完成しえものである。The present inventors investigated various conditions for oxidizing to magnetite r-iron oxide in order to obtain cobalt-containing magnetic iron oxide that has high coercive force, good magnetic stability, and favorable magnetic properties. Circle. As a result, when magnetite is oxidized at a temperature not exceeding 1220°C, which is lower than that of conventional techniques, it is possible to obtain r-iron oxide, which has high surface activity, excellent dispersibility in aqueous media, and does not adhere to metal compounds such as cobalt. r-
It has been found that the cobalt-containing magnetic iron oxide obtained by coating iron oxide with a cobalt compound or a cobalt compound and other metal compounds has a high coercive force and good temperature stability, thus completing the present invention. .
すなわち、本発明は針状マグネタイトを酸化して針状ｒ
−酸化鉄を得、その表面にコバルト化合物、又はコバル
ト化合物および他の金属化食物を被着してコバルト含有
磁性酸化鉄を製造する方法において、針状マグネタイト
を２２０℃を越えない温度で酸化してｒ−酸化鉄にする
ことを％黴とするコバルト含有磁性酸化鉄の製造方法で
ある。That is, the present invention oxidizes acicular magnetite to form acicular magnetite.
- A method for producing cobalt-containing magnetic iron oxide by obtaining iron oxide and depositing a cobalt compound or a cobalt compound and other metallized food on its surface, in which acicular magnetite is oxidized at a temperature not exceeding 220°C. This is a method for producing cobalt-containing magnetic iron oxide, which involves converting the iron oxide into r-iron oxide.
本発明でいう針状マグネタイトは、各種ゲーナイトを通
常の方法で還元されえものか、又は脱水、還元されたも
のである。このマグネタイＦをｒ−酸化＃に酸化するに
は、空気、酸素含有ｊス、その他の酸化剤勢が用いられ
る。こζでいうγ−酸化鉄とは、酸化物のＦ・／食Ｆ・
がα０５以下のものを総称するー。ｒ−酸化鉄Ｏｙ・ツ
全Ｆ・が０．０２以下Ｏ場合ａ４１１に好ましい。The acicular magnetite referred to in the present invention is one that can be reduced by various types of goenite by a conventional method, or one that has been dehydrated and reduced. To oxidize this magnetite F to r-oxidation #, air, oxygen-containing gas, or other oxidizing agents are used. γ-iron oxide in this ζ refers to oxide F・/edible F・
is a general term for those with α05 or less. It is preferable for a411 when the r-iron oxide Oy/total F/ is 0.02 or less.
コバルト化合物としては水酸化コパルＦ１酸化コバルト
等が挙げられ、他の金属化合一としてはＦ＊、 Ｍｕ、
Ｚｖｈ、 ＮＬ Ｃｒの水酸化−１酸化物等が挙げら
れる。Cobalt compounds include Copal hydroxide F1 Cobalt oxide, and other metal compounds include F*, Mu,
Examples include Zvh, NL Cr hydroxide-1 oxide, and the like.
本発明の特徴は、針状マグネタイトを酸化して針状γ−
酸化鉄を得、その表面にコバルト化合物、又はコバルト
化合物および他Ｏ金異化舎物を被着してコバルト含有磁
性酸化鉄を製造する方法において、針状マグネタイトを
２２０℃を越えない温度で酸化してｒ−酸化鉄とするこ
１十
とであり、該マグネタイトのＦ・を十分に酸化すること
が必要である。ｒ−酸化鉄にＦ＠計がＶ♂／全Ｆ・とし
て０．０５を越えて残留しているときは、Ｆ・／全Ｆ・
がα０５以下の場合に比べて、コバルト化合物、又はコ
バルト化合物および他の金属化合一を被着して製造し九
コバルト含有磁性酸化鉄の温度安定性が低下する。酸化
温度としては２２０℃を越えない温度であり、望ましく
は１２０℃以上２００℃以下、特に望ましくｔｉ１３０
℃以上１９０℃以下の温度である。The feature of the present invention is that acicular magnetite is oxidized to form acicular γ-
In the method of producing cobalt-containing magnetic iron oxide by obtaining iron oxide and coating its surface with a cobalt compound or a cobalt compound and other O-gold dissimilators, acicular magnetite is oxidized at a temperature not exceeding 220°C. It is necessary to make r-iron oxide, and it is necessary to sufficiently oxidize the F of the magnetite. If the F@ meter remains in r-iron oxide in excess of 0.05 as V♂/total F.
The temperature stability of the cobalt-containing magnetic iron oxide produced by depositing a cobalt compound or a cobalt compound and another metal compound is lower than that when α05 or less. The oxidation temperature is a temperature not exceeding 220°C, preferably 120°C or more and 200°C or less, particularly preferably ti130°C.
The temperature is 190°C or higher.
１２０℃未満の場合は酸化に長時間を要し、工業的には
不利となる。酸化に供するマグネタイト紘還元されてま
もない活性の高いものがよい。If the temperature is less than 120°C, oxidation takes a long time, which is disadvantageous industrially. It is best to use highly active magnetite that has just been reduced to oxidation.
本発明で得られたｒ−酸化鉄線、高温酸化で得られえｒ
−酸化鉄に比べて、ＩＩ函活性が高く、表−１１表−２
Ｋ示すように水系媒液中での分散性に優れ、コバルト岬
の金属化合物と附着しやすいといつ九特徴を有する。本
発明Ｏｒ−酸化鉄が如何なる理由ですぐれた磁気特性を
有するのかは未だ明らかにするに至っていないが、（１
）比較的低温で酸化されていることから、ｒ−酸化鉄０
表面にＯＨ基が存在している（２）高温度で酸化された
ｒ−酸化鉄と異なる磁気構造を持っている、ことなどが
表面活性の向上、水系分散性の改善の原因となり、コバ
ルト被着の効果を九かめていると推定される。The r-iron oxide wire obtained in the present invention can be obtained by high temperature oxidation.
-Higher box II activity than iron oxide, Table-11 Table-2
As shown in K, it has excellent dispersibility in an aqueous medium, and has the following nine characteristics: it easily adheres to the metal compound of Cobalt Cape. Although it has not yet been clarified why the Or-iron oxide of the present invention has excellent magnetic properties, (1
) Since it is oxidized at a relatively low temperature, r-iron oxide 0
The presence of OH groups on the surface (2) has a magnetic structure different from that of r-iron oxide, which is oxidized at high temperatures, which leads to improved surface activity and improved aqueous dispersibility. It is estimated that the effect of wearing clothes is greatly affected.
ｒ−酸化鉄の表面にコバルト化合物、又はコバルト化合
物および他の金属化合物を被着する方法としては次のも
のが挙げられる。Examples of methods for depositing a cobalt compound or a cobalt compound and other metal compounds on the surface of r-iron oxide include the following.
＋１＞ コバルト塩が溶解し、ｒ−酸化鉄が懸濁して
いる水系スラリー、又はコバルト塩および他の金属塩が
溶解し、ｒ−酸化鉄が懸濁している水系スラリーにアル
カリを加える。+1> Adding an alkali to an aqueous slurry in which a cobalt salt is dissolved and r-iron oxide is suspended, or an aqueous slurry in which a cobalt salt and other metal salts are dissolved and r-iron oxide is suspended.
（２） アルカリが溶解し、ｒ−酸化鉄が懸濁してい
る水系スラリーにコバルト塩溶液、又はコバルト塩と他
の金属塩との溶液を加える。(2) A cobalt salt solution or a solution of a cobalt salt and another metal salt is added to an aqueous slurry in which an alkali is dissolved and r-iron oxide is suspended.
上記のいずれの方法によって被着してもよいが、コバル
ト含有磁性酸化鉄の保磁力を高める上からは（１）の方
法が望ましい。被着する時の雰囲気は、酸化性、不活性
、還元性の−ずれでもよいが、ｒ−酸化鉄の表面活性を
妨害しないように、且つ被着する金属の水系スラＩＪ
−における化学的性質を考慮して選ばれるべきである。Although it may be deposited by any of the above methods, method (1) is preferable from the viewpoint of increasing the coercive force of the cobalt-containing magnetic iron oxide. The atmosphere at the time of deposition may be oxidizing, inert, or reducing, but the atmosphere should be such that it does not interfere with the surface activity of r-iron oxide and that the atmosphere is a water-based slug IJ of the metal to be deposited.
- should be selected taking into account the chemical properties of
反応温度は室温から沸点、沸点以上のいずれでもよいが
、室温で十分効果がある。アルカリ０添加量線、蟲骸金
属塩を沈澱させるに十分てあＩナイト重量に対してＰと
してα３％を含むオルトリン酸の水溶液に浸漬して替ン
酸イオンをａ−グーナイトに吸着させ、ｆ１遍、乾燥し
た。The reaction temperature may be anywhere from room temperature to the boiling point or above the boiling point, but room temperature is sufficient. The alkali 0 addition amount curve is sufficient to precipitate the goonite metal salt.Alternative acid ions are adsorbed to a-goonite by immersion in an aqueous solution of orthophosphoric acid containing α3% as P based on the weight of I-goonite. It was completely dry.
つづいて７００’Ｃで脱水してα−酸化鉄とし、水嵩ガ
スで４５０’Ｃで還元し針状マグネタイトを得九。この
マグネタイトを表−２に示す温度で酸化し、得られた針
状ｒ−酸化鉄の物性を欄定した。Subsequently, it was dehydrated at 700'C to obtain α-iron oxide, and reduced with water bulk gas at 450'C to obtain acicular magnetite. This magnetite was oxidized at the temperature shown in Table 2, and the physical properties of the obtained acicular r-iron oxide were evaluated.
１１１！−２
前記（イ）、（ロ）で得られたｒ−酸化鉄に次の２つの
方法でコバルト化合物等を被着した。111! -2 Cobalt compounds and the like were deposited on the r-iron oxide obtained in (a) and (b) above using the following two methods.
被着方法１゜
ｒ−酸化鉄１００ｇとｒ−酸化鉄中の全Ｆ・に対して０
．０５の重量割合に相当するＣＯ−４含む硫酸コバルト
水溶液１ｊとでスラリーを作成し、そのスラリーに室温
で、Ｃ・を中和するに必要な当量よりやや過剰のアルカ
リな徐々に添加して、Ｃ・を水酸化物Ｋ Ｌ％ ｒ−酸
化鉄の表面に析出させる。＃スラリーを９０℃で１時間
加熱し、Ｃ過、水洗、乾燥を行った。Deposition method 1゜100g of r-iron oxide and 0 for total F in r-iron oxide
．． A slurry is prepared with an aqueous cobalt sulfate solution 1j containing CO-4 corresponding to a weight ratio of 0.05, and an alkali in an amount slightly in excess of the equivalent required to neutralize C is gradually added to the slurry at room temperature. C. is precipitated on the surface of the hydroxide K L% r-iron oxide. #The slurry was heated at 90° C. for 1 hour, filtered with C, washed with water, and dried.
被着方法λ
ｒ−酸化鉄１００ｇとｒ−酸化鉄中の全ｒ・に対してα
０５の重量割合に相当するＣｏを含む硫酸コバルトと、
ｒ−酸化鉄中の全Ｆ＠に対して０．１の重量割合に相当
するＦ・を含む硫酸嬉−鉄とを溶かした水溶液とでスラ
リーを作成し、そのスラリーに’４温でＣＧ”、！：
ｐ・１を中和するのに必要な重量よりやや過剰のアルカ
リを徐々に添加して、ＣＯとＦｅとを水酸化物又は鹸化
物にし、ｒ−酸化鉄の表面に析出させる。皺スラリーを
Ｃ過、洗浄、乾燥し、窒素ガス中で、２３０℃、１時間
熱処理を行った。Deposition method λ α for 100 g of r-iron oxide and total r in r-iron oxide
cobalt sulfate containing Co in a weight proportion of 0.05;
A slurry was prepared with an aqueous solution containing iron sulfate containing F corresponding to a weight ratio of 0.1 to the total F in the r-iron oxide, and the slurry was added to the CG at 4 temperatures. ,!:
By gradually adding alkali in an amount slightly in excess of the weight required to neutralize p.sub.1, CO and Fe are converted into hydroxides or saponified products, which are precipitated on the surface of r-iron oxide. The wrinkle slurry was filtered with C, washed, dried, and heat-treated at 230° C. for 1 hour in nitrogen gas.
被着方法１．、 ２．で得られたコバルト含有磁性表−
３の保磁力の温度特性とは、磁性酸化鉄ｆ）保Ｈ１力（
Ｈｃ） ｔｒｉｍ （２ｓ℃）とｘｚｓ℃ｆ） ２ 点
テｌｌｌ Ｌ、（１２５℃）Ｈ＠ ／ｍｌ温のＨａ）Ｘ
１００Ｋよって定める。保磁力の増加とは、ｒ−酸化鉄
の保磁力とコバルト含有磁性酸化鉄の保磁力との差を示
している。Adhering method 1. , 2. Cobalt-containing magnetic table obtained in -
The temperature characteristics of the coercive force in 3 are: magnetic iron oxide f) coercive H1 force (
Hc) trim (2s℃) and xzs℃f) 2 points Tll L, (125℃)H@/ml temperature Ha)X
Determined by 100K. The increase in coercive force indicates the difference between the coercive force of r-iron oxide and the coercive force of cobalt-containing magnetic iron oxide.
上記の実施例、比較例で得られ九ｒ−酸化鉄Ｉ〜ＭＫ’
：：）いて、酸化温度とコバルト含有磁性酸化鉄の保磁
力の温Ｒ特性との関係、および酸化温度と、ｒ−酸化鉄
とコバルト含有磁性酸化鉄との保磁力の差の関係を図−
１１図−２に示した。それぞれ被着方法１．２でコバル
ト化舎物等を被着したものｋつｉでの値である。酸化温
度が２２０℃程度以下になると、保磁力の温度４Ｉ性が
向上し、保磁力の増加が顕著となる。Niner-iron oxides I~MK' obtained in the above Examples and Comparative Examples
::) The relationship between the oxidation temperature and the temperature R characteristic of the coercive force of cobalt-containing magnetic iron oxide, and the relationship between the oxidation temperature and the difference in coercive force between r-iron oxide and cobalt-containing magnetic iron oxide are shown in the figure.
It is shown in Figure 11-2. These are the values for k and i, which were coated with cobaltized structures and the like using deposition method 1.2. When the oxidation temperature is about 220° C. or lower, the temperature 4I property of coercive force improves, and the increase in coercive force becomes remarkable.
【図面の簡単な説明】
図−１において、横軸は酸化温度（℃）、縦軸は保磁力
のｉｌ＆特性（チ）を示す０図−２に′ｓＰ％Ａて、横
軸は酸化温度（℃）、縦軸は保磁力の増加（Ｏ・）を示
す０図−１および図−２ｋｓＰｉて、−−ｌはｒ−酸化
鉄Ｉ 〜ＭＫ”）ｈ？、被着方法１で被着し九もの、―
＆２はｒ−酸化鉄Ｘ〜ＭＫつ−て、被着方法２で被着し
たものである。
特許出願人 石原産桑株式会社
第１図
ｆｏｏ ｆ５０ 舐 ２５０
シ０３５０第２図
１００ ２００ ３
ｏ。[Brief explanation of the drawings] In Figure-1, the horizontal axis shows the oxidation temperature (°C), and the vertical axis shows the coercive force il & characteristic (ch). (°C), the vertical axis shows the increase in coercive force (O. Nine things...
&2 are r-iron oxides X to MK deposited by deposition method 2. Patent applicant Ishihara Sankuwa Co., Ltd. Figure 1 foo f50 lick 250
0350 Figure 2 100 200 3
o.
Claims (1)
＊Ｗにコバルト化金物、又はコバルト化金物および他の
金属化合物を被着してコバルト含有磁性酸化鉄、を製造
する方法において、針状マグネタイトを２２０℃を越え
ない温度で酸化してｒ−酸化鉄とすることを特徴とする
コバルト含有磁性酸化鉄を製造する方法。In a method for producing cobalt-containing magnetic iron oxide by oxidizing acicular magnetite to obtain acicular r-iron oxide, and depositing a cobaltized metal, or a cobaltized metal and other metal compounds on No. 7 *W. A method for producing cobalt-containing magnetic iron oxide, which comprises oxidizing acicular magnetite to r-iron oxide at a temperature not exceeding 220°C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56117363A JPS5818904A (en) | 1981-07-27 | 1981-07-27 | Preparation of magnetic iron oxide containing cobalt |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56117363A JPS5818904A (en) | 1981-07-27 | 1981-07-27 | Preparation of magnetic iron oxide containing cobalt |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5818904A true JPS5818904A (en) | 1983-02-03 |
| JPH0147882B2 JPH0147882B2 (en) | 1989-10-17 |
Family
ID=14709811
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56117363A Granted JPS5818904A (en) | 1981-07-27 | 1981-07-27 | Preparation of magnetic iron oxide containing cobalt |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5818904A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59147414A (en) * | 1983-02-10 | 1984-08-23 | Ishihara Sangyo Kaisha Ltd | Manufacture of magnetic iron oxide powder containing cobalt |
-
1981
- 1981-07-27 JP JP56117363A patent/JPS5818904A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59147414A (en) * | 1983-02-10 | 1984-08-23 | Ishihara Sangyo Kaisha Ltd | Manufacture of magnetic iron oxide powder containing cobalt |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0147882B2 (en) | 1989-10-17 |
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