JPS6331084B2 - - Google Patents
Info
- Publication number
- JPS6331084B2 JPS6331084B2 JP54065779A JP6577979A JPS6331084B2 JP S6331084 B2 JPS6331084 B2 JP S6331084B2 JP 54065779 A JP54065779 A JP 54065779A JP 6577979 A JP6577979 A JP 6577979A JP S6331084 B2 JPS6331084 B2 JP S6331084B2
- Authority
- JP
- Japan
- Prior art keywords
- mill scale
- iron oxide
- magnets
- ferrite
- calcining
- 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.)
- Expired
Links
- 229910000859 α-Fe Inorganic materials 0.000 claims description 17
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 14
- AYJRCSIUFZENHW-UHFFFAOYSA-L barium carbonate Inorganic materials [Ba+2].[O-]C([O-])=O AYJRCSIUFZENHW-UHFFFAOYSA-L 0.000 claims description 7
- 238000001354 calcination Methods 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 7
- 238000010298 pulverizing process Methods 0.000 claims description 6
- 238000005098 hot rolling Methods 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 claims description 3
- BDAGIHXWWSANSR-NJFSPNSNSA-N hydroxyformaldehyde Chemical compound O[14CH]=O BDAGIHXWWSANSR-NJFSPNSNSA-N 0.000 claims description 3
- 229910000018 strontium carbonate Inorganic materials 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 27
- 235000013980 iron oxide Nutrition 0.000 description 13
- 239000002994 raw material Substances 0.000 description 8
- 239000002245 particle Substances 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 239000000843 powder Substances 0.000 description 3
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 238000002441 X-ray diffraction Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000000460 chlorine Substances 0.000 description 2
- 229910052801 chlorine Inorganic materials 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- MBMLMWLHJBBADN-UHFFFAOYSA-N Ferrous sulfide Chemical compound [Fe]=S MBMLMWLHJBBADN-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 229910001422 barium ion Inorganic materials 0.000 description 1
- 239000011362 coarse particle Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- VBMVTYDPPZVILR-UHFFFAOYSA-N iron(2+);oxygen(2-) Chemical class [O-2].[Fe+2] VBMVTYDPPZVILR-UHFFFAOYSA-N 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 239000011802 pulverized particle Substances 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 229910001427 strontium ion Inorganic materials 0.000 description 1
- 238000007669 thermal treatment Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/26—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on ferrites
- C04B35/2683—Other ferrites containing alkaline earth metals or lead
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Magnetic Ceramics (AREA)
- Hard Magnetic Materials (AREA)
Description
本発明はミルスケールをフエライト磁石の主原
料として使用するフエライト磁石の製造方法に関
する。
フエライト磁石の主原料である酸化鉄は、一般
に製鉄業において、鋼板を酸洗いをした廃液の焙
焼によるものや、硫化鉄鉱の焙焼によるものが使
用されているため、不純物として塩素分や、硫黄
分が含まれている。これをフエライト磁石の製造
時に使用すると仮焼炉や集塵設備を著しく腐蝕さ
せるばかりでなく、フエライト磁石の焼結密度を
低下させ、高磁力磁石が得られないと言つた欠点
があつた。また従来の酸化鉄原料は平均粒径１〜
2μ以下の微細な粒子であり、嵩密度が小さく流
動性が悪くホツパー内でブリヂングを生じやす
く、さらにこれ等をスラリー化た場合に粘性が高
くなる等取扱い上に種々問題点があつた。
ミルスケールをフエライト磁石用原料として使
用することは特公昭44−9793、同49−28077にも
示されており、前者はミルスケールの完全酸化を
目的とし焙焼することを、また後者は粉体粒度を
5.3μ以下に微粉砕をすることを特徴としている。
一般にフエライト磁石は酸化鉄とバリウム又はス
トロンチウムの炭酸塩を混合、仮焼、粗粉砕、成
形、焼成する工程が用いられており、仮焼工程は
素原料である炭酸塩と酸化鉄を反応させ、フエラ
イト化するものである。この反応を速やかに完全
に行わせるために、従来酸化鉄は平均粒度が１〜
2μ以下にして反応性が進行しやすいようなもの
が適当とされて来た。また、反応混合作業を容易
にするために全ての酸化鉄をFe2O3とすることが
理想であるとされて来た。このような酸化鉄を、
鋼板を熱間圧延する際に発生するミルスケールを
原料として得るには、これを粉砕し酸素を含む雰
囲気中または、空気中で２時間程度酸化させ、更
に微粉砕とする等、非常に繁雑な工程が必要とさ
れて来た。
本発明は上記問題点に軽減するものとしてミル
スケールとの粗粉砕で全粉体量の96％以上を10μ
〜74μ程度の粒子からなる酸化鉄であつて、全Fe
イオンとBa又はSrイオンを検出することにより
容易に成分調整をした後、仮焼を行い混合原料が
完全にフエライト化することを見出した。フエラ
イト磁石の製造方法を提供するものである。
以下本発明の実施例を次に示す。
実施例
500℃で１時間乾燥したミルスケールを、ボー
ルミルにて８時間粉砕する。粉度分布は第１図に
示されるように10μ〜74μほとんどであり、嵩密
度は1.94ｇ／c.c.のミルスケール粗粉砕とし炭酸バ
リウムを混合し、成分調製にはけい光Ｘ線分析を
用い、モル比Fe＋Fe／Ba＝5.53の混合物とし
た。この混合物に対しSiO2、を0.1重量％添加し、
1330℃にて１時間仮焼を行つた。仮焼品はジヨー
クラツシヤーで粗粉砕後、乾式ミルで10μ程度に
一次粉砕した後、さらに、アトライターにて平均
粒度1μまで湿式徴粉砕する。これによつて得ら
れたスラリーを金型40φ×15ｍ／ｍ内に加圧力
0.5ton／cm2で磁場中脱水成形し、1200℃及び1230
℃で１時間焼成して得られたフエライト磁石の磁
気特性を第１表に示す。
The present invention relates to a method of manufacturing a ferrite magnet using mill scale as the main raw material of the ferrite magnet. Iron oxide, which is the main raw material for ferrite magnets, is generally produced in the steel industry by roasting waste liquid from pickling steel plates or roasting iron sulfide ore, so it contains impurities such as chlorine and other iron oxides. Contains sulfur. If this is used in the production of ferrite magnets, it not only significantly corrodes the calcining furnace and dust collection equipment, but also reduces the sintered density of the ferrite magnets, making it impossible to obtain high magnetic force magnets. In addition, conventional iron oxide raw materials have an average particle size of 1~
These are fine particles of 2μ or less, have a low bulk density, have poor fluidity, and are prone to bridging in the hopper.Furthermore, when they are made into a slurry, they have a high viscosity, which poses various problems in handling. The use of mill scale as a raw material for ferrite magnets is also shown in Japanese Patent Publications No. 44-9793 and No. 49-28077. particle size
It is characterized by being finely pulverized to 5.3μ or less.
Generally, ferrite magnets are produced by mixing iron oxide and barium or strontium carbonate, calcination, coarse pulverization, shaping, and firing.The calcination process involves reacting the raw material carbonate and iron oxide. It turns into ferrite. In order to carry out this reaction quickly and completely, conventional iron oxide has an average particle size of 1 to 1.
It has been considered appropriate to use a material with a diameter of 2μ or less so that the reactivity progresses easily. Furthermore, it has been considered ideal that all iron oxide be Fe 2 O 3 in order to facilitate the reaction and mixing work. Such iron oxide,
In order to obtain mill scale generated during hot rolling of steel plates as a raw material, it is a very complicated process such as crushing it, oxidizing it in an oxygen-containing atmosphere or air for about 2 hours, and then pulverizing it. A process was needed. The present invention alleviates the above problems by coarsely pulverizing more than 96% of the total amount of powder with a mill scale.
Iron oxide consisting of particles of ~74μ, total Fe
After easily adjusting the composition by detecting ions and Ba or Sr ions, the mixed raw materials were found to be completely converted to ferrite by calcining. A method for manufacturing a ferrite magnet is provided. Examples of the present invention are shown below. Example Mill scale dried at 500°C for 1 hour is ground in a ball mill for 8 hours. As shown in Figure 1, the powder distribution is mostly 10μ to 74μ, bulk density is 1.94g/cc, mill scale coarse pulverization is used, barium carbonate is mixed, and fluorescent X-ray analysis is used to prepare the ingredients. A mixture with a molar ratio of Fe+Fe/Ba=5.53 was prepared. Add 0.1% by weight of SiO 2 to this mixture,
Calcining was performed at 1330°C for 1 hour. The calcined product is coarsely ground with a geocrusher, first ground with a dry mill to a particle size of about 10μ, and then wet-pulverized with an attritor to an average particle size of 1μ. The slurry obtained by this is pressed into the mold 40φ x 15m/m.
Dehydrated and molded in a magnetic field at 0.5ton/ cm2 , 1200℃ and 1230℃
Table 1 shows the magnetic properties of the ferrite magnet obtained by firing at ℃ for 1 hour.
【表】
表から明らかなようにミルスケールを用いたフ
エライト磁石は、従来の酸化鉄であるルスナー法
による酸化鉄を用いた場合と同値の残留磁束密度
（Br）を持ち、保持力（Hc）を10％向上させて
いる。
本発明に用いたミルスケールの成分は第２表の
通りである。[Table] As is clear from the table, ferrite magnets using mill scale have the same residual magnetic flux density (Br) and coercive force (Hc) as those using conventional iron oxide produced by the Rusner method. has improved by 10%. The components of the mill scale used in the present invention are shown in Table 2.
【表】
表からFeが大量に含まれるのは、鋼板の熱
圧延の際に表面が酸化され、ミルスケールが生成
されると同時に、ミルスケールは鋼板の加熱度と
圧延時の速度およびその他の酸化条件の違いか
ら、Fe2O3、FeOおよびFe3O4となることに寄因
している。このFe2+イオンは、本発明の製造工
程中に酸化されFe3+となり、フエライト磁石と
して何ら問題にならないことは、Fe2+の化学分
析並びにＸ線回析により確認した。
このようにして得られたフエライト磁石の磁気
特性は、従来の酸化鉄を用いたものと比較して、
同程度の残留磁束密度を有し、保磁力においては
従来のものより優れた磁気特性を有している。
なお本発明による実施例では、混合物に炭酸バ
リウムをまた添加物としてSiO2を用いたが、当
然これらに近い化合物等を用いた場合においても
同様の特性値が得られている。
以上説明したように本発明のように粒度の粗い
ミルスケールを用いても、従来と同等かそれ以上
の特性値が得られるばかりか、以下なる効果があ
ることは工業上大なるものがある。
(1) ミルスケールを化学的、熱的な処理を加える
ことなく、10μ〜74μ程度に粉砕を行い、これ
を原料酸化鉄として従来の酸化鉄を用いたもの
より高い保持力を有するフエライト磁石を得る
ことが出来た。
(1) ミルスケール粉砕粉は、嵩密度が高く取扱い
が容易であり、且つ製造原価を低減させる要素
が大きい。
(3) ミルスケールは、塩素や硫黄の含有が少な
く、焼成炉や炉ダクト部分を腐食させない。[Table] From the table, the reason why a large amount of Fe is contained is that during hot rolling of the steel plate, the surface is oxidized and mill scale is generated. This is due to the difference in oxidation conditions resulting in Fe 2 O 3 , FeO and Fe 3 O 4 . This Fe 2+ ion was oxidized to Fe 3+ during the manufacturing process of the present invention, and it was confirmed by chemical analysis and X-ray diffraction of Fe 2+ that it did not pose any problem as a ferrite magnet. The magnetic properties of the ferrite magnet obtained in this way are compared to those using conventional iron oxide.
It has similar residual magnetic flux density and superior magnetic properties than conventional ones in terms of coercive force. Note that in the examples according to the present invention, barium carbonate was used in the mixture and SiO 2 was used as an additive, but of course similar characteristic values were obtained even when compounds similar to these were used. As explained above, even if a mill scale with a coarse particle size is used as in the present invention, not only can characteristic values equal to or higher than conventional ones be obtained, but also the following effects are industrially significant. (1) Mill scale is crushed to about 10μ to 74μ without chemical or thermal treatment, and this is used as a raw material for iron oxide to create ferrite magnets that have a higher holding power than conventional iron oxide magnets. I was able to get it. (1) Mill scale pulverized powder has a high bulk density, is easy to handle, and is a major factor in reducing manufacturing costs. (3) Mill scale has low chlorine and sulfur content and will not corrode the kiln or furnace duct.
第１図は本発明実施によるミルスケール粉砕粒
度分布図である。
FIG. 1 is a mill scale pulverized particle size distribution diagram according to the present invention.
Claims (1)
砕量の96％以上を10μ〜74μに粗粉砕を行い焙焼
処理を行うことなくバリウム又はストロンチウム
の炭酸塩と混合後仮焼して得られることを特徴と
フエライト磁石の製造方法。 ２ 鉄の熱間圧延の際発生するミルスケールとバ
リウム又はストロンチウムの炭酸塩を10μ〜74μ
程度になるよう混合粉砕した後仮焼して得られる
ことを特徴とフエライト磁石の製造方法。[Claims] 1. After coarsely pulverizing 96% or more of the mill scale generated during hot rolling of iron to 10μ to 74μ and mixing with barium or strontium carbonate without roasting. A method for manufacturing ferrite magnets characterized by being obtained by calcining. 2. Mill scale generated during hot rolling of iron and barium or strontium carbonate in a 10μ to 74μ
A method for manufacturing ferrite magnets, characterized in that they are obtained by mixing and pulverizing the magnets to a certain degree and then calcining them.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6577979A JPS55157215A (en) | 1979-05-28 | 1979-05-28 | Manufacture of ferrite magnet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6577979A JPS55157215A (en) | 1979-05-28 | 1979-05-28 | Manufacture of ferrite magnet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS55157215A JPS55157215A (en) | 1980-12-06 |
| JPS6331084B2 true JPS6331084B2 (en) | 1988-06-22 |
Family
ID=13296858
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6577979A Granted JPS55157215A (en) | 1979-05-28 | 1979-05-28 | Manufacture of ferrite magnet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS55157215A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03123004A (en) * | 1989-03-31 | 1991-05-24 | Sumitomo Special Metals Co Ltd | Manufacture of highly efficient sr ferrite magnet |
| JP3054164B2 (en) * | 1990-02-21 | 2000-06-19 | 住友特殊金属株式会社 | Production method of raw material for ferrite magnet |
| JP3611872B2 (en) * | 1993-09-28 | 2005-01-19 | 株式会社Ｎｅｏｍａｘ | Method for manufacturing raw material for ferrite magnet |
-
1979
- 1979-05-28 JP JP6577979A patent/JPS55157215A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS55157215A (en) | 1980-12-06 |
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