JPH0741320A - Production of iron oxide for ferrite - Google Patents
Production of iron oxide for ferriteInfo
- Publication number
- JPH0741320A JPH0741320A JP5188168A JP18816893A JPH0741320A JP H0741320 A JPH0741320 A JP H0741320A JP 5188168 A JP5188168 A JP 5188168A JP 18816893 A JP18816893 A JP 18816893A JP H0741320 A JPH0741320 A JP H0741320A
- Authority
- JP
- Japan
- Prior art keywords
- iron oxide
- spray
- roasting
- residual
- furnace
- 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)
- Soft Magnetic Materials (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、鋼板等の鋼材酸洗廃液
からスプレー焙焼によりフェライト用酸化鉄を製造する
技術に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for producing iron oxide for ferrite by spray roasting from a steel pickling waste liquid such as a steel plate.
【０００２】[0002]
【従来の技術】フェライト用酸化鉄は一般に、鋼材等の
酸洗時に発生する廃塩酸をスプレー焙焼して製造してい
る。そして、このようなフェライト用酸化鉄の品質は、
粉体特性値、すなわち、例えば、嵩密度（ＢＤ），平均
粒径（ｄ），仮焼成前密度（ρ 1 ），仮焼成後密度（ρ
2 ），直径方向収縮率（ＳＨ−Ｄ），高さ方向収縮率
（ＳＨ−Ｈ）、また、残留塩素（Ｃｌ）分によって格付
けされている。2. Description of the Related Art Iron oxide for ferrite is generally used for steel materials.
Manufactured by spray roasting waste hydrochloric acid generated during pickling
It And the quality of such iron oxide for ferrite is
Powder property values, ie, bulk density (BD), average
Particle size (d), density before calcination (ρ 1 ), Density after calcination (ρ
2 ), Diametrical shrinkage (SH-D), height shrinkage
(SH-H), and rating by residual chlorine (Cl) content
It has been injured.
【０００３】ところで、フェライト用酸化鉄のユーザー
はフェライト用酸化鉄に対し、ある一定の品質（粉体特
性値、残留Ｃｌ分）を要求している。この粉体特性値が
一定でないと、焼成時の収縮率がばらつくので、フェラ
イトコア焼成時に割れ，歪，寸法異常等の不良が発生
し、また、製品フェライトコアの磁気特性を一定とする
ことができない。また残留Ｃｌ分が多いとフェライトの
品質に割れ、歪み等の影響を及ぼすだけでなく、フェラ
イト製造設備の腐食の問題が生じる。By the way, users of iron oxides for ferrites require certain constant quality (powder characteristic values, residual Cl content) for iron oxides for ferrites. If this powder characteristic value is not constant, the shrinkage ratio during firing will vary, and defects such as cracks, distortion, and dimensional abnormalities will occur during firing of the ferrite core, and the magnetic characteristics of the product ferrite core will be constant. Can not. Further, if the residual Cl content is large, not only the quality of ferrite is affected by cracks and strains, but also the problem of corrosion of the ferrite manufacturing equipment arises.
【０００４】スプレー焙焼による酸化鉄の製造は、図１
に示すような焙焼炉１にて、廃塩酸をスプレーヘッダー
２より燃焼バーナ４でつくり出した熱風旋回流５と接触
させることで行う。熱風は焙焼炉直胴部の下方に接線方
向を向いた燃焼バーナ４にて発生し、炉内壁に沿って上
昇旋回流となる。その旋回流中にスプレーされた廃塩酸
中の塩化鉄分が、酸化反応により酸化第２鉄となり、焙
焼炉１の底部より抜き出される。このスプレー焙焼によ
る酸化鉄製造では、例えば焙焼胴部温度での温度管理と
している。焙焼胴部温度とは、図１に示すようにスプレ
ー焙焼炉１の燃焼バーナ４上部に設置された感熱管３の
検出温度である。その場合、当然、その胴部温度によっ
て粉体特性と残留Ｃｌは左右される。例えば特開昭６１
−８６４２５号の本文中にも示されている通り焙焼胴部
温度が高ければ、ＳＨ−Ｄは低下し、残留Ｃｌも低下す
る。焙焼胴部温度管理だけでは粉体特性と残留Ｃｌをそ
れぞれ独立して制御はできない。The production of iron oxide by spray roasting is shown in FIG.
In the roasting furnace 1 as shown in (1), waste hydrochloric acid is brought into contact with the hot air swirl flow 5 produced by the combustion burner 4 from the spray header 2. The hot air is generated in the combustion burner 4 which is oriented tangentially below the straight body of the roasting furnace, and forms a rising swirl flow along the inner wall of the furnace. The iron chloride content in the waste hydrochloric acid sprayed in the swirling flow becomes ferric oxide by the oxidation reaction and is extracted from the bottom of the roasting furnace 1. In the iron oxide production by the spray roasting, the temperature is controlled, for example, at the roasting barrel temperature. The roasting body temperature is the temperature detected by the heat sensitive tube 3 installed above the combustion burner 4 of the spray roasting furnace 1 as shown in FIG. In that case, of course, the powder temperature and residual Cl depend on the body temperature. For example, JP-A-61
As shown in the text of -86425, when the roasting barrel temperature is high, SH-D is lowered and residual Cl is also lowered. The powder characteristics and residual Cl cannot be independently controlled only by controlling the temperature of the roasting body.
【０００５】また、特公昭５４−２８６２６号において
は傾斜をつけたスプレーヘッダーの位置と方向が調節で
きる装置を用いた残留Ｃｌの低減方法が報じられてお
り、この方法においては、例として、スプレー粒子が未
焙焼のまま（残留Ｃｌが高い）の場合には、傾斜をもた
せたヘッダーの向きを炉壁側へ向けるか、あるいはスプ
レーヘッダーの位置を上げる、もしくはその両方で対処
するようになっている。しかし、その報告のなかでは酸
化鉄の製造における、焙焼の完了として着目されている
だけで、酸化鉄品質、特に粉体特性値についてはなんら
考察されていないという問題点があった。In Japanese Patent Publication No. 54-28626, there is reported a method for reducing residual Cl using a device capable of adjusting the position and direction of an inclined spray header. In this method, as an example, a spray is used. If the particles remain unroasted (high residual Cl), the inclined header should be oriented toward the furnace wall, or the spray header should be raised, or both. ing. However, there is a problem in that report that attention is paid only to the completion of roasting in the production of iron oxide, and no consideration is given to the quality of iron oxide, particularly the powder characteristic value.
【０００６】残留Ｃｌと粉体特性の制御について特開昭
６１−８６４２５号では廃塩酸のスプレー流量を操作す
ることで達成しようとする方法が報告されている。しか
しながらこの方法においては、目的とする粉体特性を制
御するべくスプレー流量を決定しており、酸化鉄の製造
にたいし生産量が粉体特性によって制限されるため実用
的でないという問題点があった。Regarding the control of residual Cl and powder characteristics, JP-A-61-86425 reports a method to be achieved by controlling the spray flow rate of waste hydrochloric acid. However, in this method, the spray flow rate is determined in order to control the desired powder characteristics, and there is a problem that it is not practical because the production amount of iron oxide is limited by the powder characteristics. It was
【０００７】また、特開平０４−２７０１２７号ではス
プレー粒子径と最適なスプレーヘッダー位置を組み合わ
せることで、残留Ｃｌを低く押さえ、かつ粉体特性を制
御する方法が報告されている。しかしながらこの方法で
は、スプレーヘッダー位置を操作するという機械的操作
が必要であり、容易に取り得る対策でないという問題点
があった。Further, Japanese Patent Application Laid-Open No. 04-270127 reports a method of suppressing residual Cl to a low level and controlling powder characteristics by combining a spray particle size and an optimum spray header position. However, this method has a problem that it requires a mechanical operation of operating the position of the spray header and is not a measure that can be easily taken.
【０００８】[0008]
【発明が解決しようとする課題】廃塩酸のスプレー焙焼
によるフェライト用酸化鉄の製造において、品質の安定
した酸化鉄を製造するため、得られる酸化鉄の残留Ｃｌ
を低く抑えながら、粉体特性値を任意の値に制御する方
法の確立が望まれてきた。特開昭６１−８６４２５号に
おいては残留Ｃｌを抑えた上で粉体特性が制御できるも
ののスプレー流量による操作であるため、酸化鉄の生産
量を増加させなくてはならない実際の生産状況からして
経済的に不利である。特開平０４−２７０１２７号にお
いては、同様の効果があるものの、機械的操作であり、
容易に取り得る対策でない、あるいは対策を容易に取り
得るように機械的装置を考慮した場合、装置費用が非常
に高価となる。In the production of iron oxide for ferrite by spray roasting of waste hydrochloric acid, in order to produce iron oxide of stable quality, residual Cl of iron oxide obtained is obtained.
It has been desired to establish a method for controlling the powder characteristic value to an arbitrary value while suppressing the value of the powder. In JP-A-61-86425, although the powder characteristics can be controlled while suppressing the residual Cl, the operation is performed by the spray flow rate, so from the actual production situation that the iron oxide production amount must be increased. It is economically disadvantageous. In Japanese Patent Laid-Open No. 04-270127, although it has the same effect, it is a mechanical operation.
If a mechanical device is considered so that it is not a measure that can be taken easily or that a measure can be taken easily, the cost of the device becomes very high.
【０００９】本発明は、管理温度を一定としたうえで燃
焼ガスバーナーの空気比（ｍ値、空気比とは燃料が燃焼
する時に必要な最低限の空気量（理論燃焼空気量）に対
する比）を操作することにより酸化鉄の残留Ｃｌを抑え
ながら粉体特性を制御し得る実用的な酸化鉄の製造方法
を提供することを目的とするものである。According to the present invention, the air temperature of the combustion gas burner is kept constant (m value, air ratio is the ratio to the minimum air amount (theoretical combustion air amount) required when the fuel burns) while keeping the control temperature constant. It is an object of the present invention to provide a practical iron oxide production method capable of controlling powder characteristics while suppressing residual Cl of iron oxide by operating.
【００１０】[0010]
【課題を解決するための手段】本発明者は、廃塩酸（塩
化鉄溶液）のスプレー粒子が焙焼炉の燃焼ガス旋回流内
で受ける熱的影響により酸化反応を経て酸化鉄になるこ
とに着目し、焙焼炉内でのスプレー粒子の熱履歴を操作
することで上述した特開昭６１−８６４２５号の問題点
が解決できるものと考えた。そこで、互いに関連する、
胴部温度、ｍ値による、スプレー粒子への熱的影響を調
査した。ｍ値によるスプレー粒子の熱的挙動を調査する
べく焙焼炉内の温度分布、燃焼ガス速度分布を計算し、
その中でのスプレー粒子の挙動のモデル計算を行った。
その結果、ｍ値がスプレー粒子の熱的挙動および酸化反
応に影響することを見いだした。Means for Solving the Problems The present inventors have decided that the spray particles of waste hydrochloric acid (iron chloride solution) undergo an oxidation reaction to become iron oxides due to the thermal effect in the combustion gas swirl flow of a roasting furnace. Focusing attention, it was thought that the problem of the above-mentioned JP-A-61-86425 can be solved by manipulating the thermal history of the spray particles in the roasting furnace. So, related to each other,
The thermal effects on the spray particles due to the body temperature and the m value were investigated. Calculate the temperature distribution and combustion gas velocity distribution in the roasting furnace to investigate the thermal behavior of the spray particles by m value,
A model calculation of the behavior of the spray particles in that was performed.
As a result, it was found that the m value affects the thermal behavior of the spray particles and the oxidation reaction.
【００１１】そしてｍ値、焙焼炉胴部温度と酸化鉄品質
との関連について実機的に検討し、実機操業により確認
した結果、この発明を完成するに至った。The relationship between m value, roasting furnace body temperature and iron oxide quality was examined on an actual machine basis and confirmed by actual machine operation. As a result, the invention was completed.
【００１２】酸化鉄の粉体特性値であるＳＨ−Ｄは特開
昭６１−８６４２５号に記載されているように熱負荷が
大きくなるにつれ低下する。従って、対応策として焙焼
炉胴部温度を下げればＳＨ−Ｄは大きくなるが、内部の
旋回流が弱まることで残留Ｃｌも上昇する結果を引き起
こす。The powder characteristic value of iron oxide, SH-D, decreases as the heat load increases, as described in JP-A-61-86425. Therefore, as a countermeasure, if the temperature of the body of the roasting furnace is lowered, the SH-D becomes large, but the internal swirl flow weakens, and the residual Cl also rises.
【００１３】本発明はｍ値を操作することにより目的に
あった粉体特性値の酸化鉄を製造するべく炉内の燃焼ガ
ス旋回流を任意に調節し、すなわちスプレー粒子の受け
る熱負荷を調整することで目的とする酸化鉄の品質を得
ようとするものである。この方法により、酸化鉄の生産
量ならびに品質面の操作の両方とも満足することが可能
となった。The present invention arbitrarily controls the combustion gas swirl flow in the furnace in order to produce iron oxide having a powder characteristic value suitable for the purpose by manipulating the m value, that is, adjusting the heat load on the spray particles. By doing so, the intended quality of iron oxide is obtained. This method made it possible to satisfy both the production amount of iron oxide and the operation in terms of quality.
【００１４】すなわち、本発明は、鋼板酸洗で発生する
廃塩酸をスプレー焙焼炉でスプレー焙焼し、酸化鉄を製
造する際、焙焼炉胴部温度を一定としながら燃焼バーナ
ーでの空気比ｍ値を１．３〜１．７に操作することによ
り、焙焼炉で生成する酸化鉄の粉体特性値を実質的に残
留Ｃｌとは無関係に任意に制御することを特徴とするフ
ェライト用酸化鉄の製造方法を提供するものである。That is, according to the present invention, when the waste hydrochloric acid generated in the pickling of steel sheets is spray roasted in a spray roasting furnace to produce iron oxide, the air in the combustion burner is kept constant while keeping the temperature of the body of the roasting furnace constant. By controlling the ratio m value to be 1.3 to 1.7, the powder characteristic value of iron oxide produced in a roasting furnace can be arbitrarily controlled substantially independently of residual Cl. A method for producing iron oxide for use is provided.
【００１５】[0015]
【作用】以下に本発明をさらに詳細に説明する。本発明
は、フェライト用酸化鉄をスプレー焙焼法により製造す
る方法に関し、原料としては鋼板酸洗で発生する廃塩酸
を用いるのが好適である。この廃塩酸を図１に示すよう
なスプレー焙焼炉で焙焼し、フェライト用酸化鉄を製造
する。The present invention will be described in more detail below. The present invention relates to a method for producing iron oxide for ferrite by a spray roasting method, and it is preferable to use waste hydrochloric acid generated in steel sheet pickling as a raw material. This waste hydrochloric acid is roasted in a spray roasting furnace as shown in FIG. 1 to produce iron oxide for ferrite.
【００１６】図１において、焙焼炉１には廃塩酸をスプ
レーヘッダー２より、Ｃガスなどの燃料および空気を燃
焼バーナ４で燃焼させて得た熱風を燃焼炉の炉壁接線方
向に流してつくり出した旋回流５中にスプレーし、塩
酸、水分などを蒸発させるとともに廃塩酸中の鉄分を酸
化してフェライト用酸化鉄を得る。In FIG. 1, in a roasting furnace 1, waste hydrochloric acid is sprayed from a spray header 2, hot air obtained by burning a fuel such as C gas and air in a combustion burner 4 is flowed in a tangential direction of a furnace wall of the combustion furnace. It is sprayed in the swirling flow 5 that has been taken out to evaporate hydrochloric acid, water and the like, and at the same time oxidize the iron content in the waste hydrochloric acid to obtain iron oxide for ferrite.
【００１７】フェライト用酸化鉄はユーザーに応じて粉
体特性値、残留塩素（Ｃｌ）分などの品質が要求され
る。従来これを解決すべく種々の提案がなされていた
が、満足できる提案がなかったのは前述の通りである。Iron oxide for ferrite is required to have quality such as powder characteristic value and residual chlorine (Cl) content depending on the user. Although various proposals have been made to solve this problem, no satisfactory proposal has been made as described above.
【００１８】そこで、本発明においては、図１に例示す
るような装置において、鋼板酸洗で発生する廃塩酸をス
プレー焙焼炉でスプレー焙焼し、酸化鉄を製造する際、
焙焼炉胴部温度を一定としながら燃焼バーナーでの空気
比ｍ値を１．３〜１．７に操作することにより、焙焼炉
で生成する酸化鉄の粉体特性値を実質的に残留Ｃｌとは
無関係に任意に制御する。Therefore, in the present invention, in the apparatus as shown in FIG. 1, when the waste hydrochloric acid generated in the steel sheet pickling is spray roasted in the spray roasting furnace to produce iron oxide,
By manipulating the air ratio m value in the combustion burner to 1.3 to 1.7 while keeping the temperature of the body of the roasting furnace constant, the powder characteristic value of the iron oxide produced in the roasting furnace remains substantially. It is controlled arbitrarily regardless of Cl.
【００１９】鋼板酸洗にて発生する廃塩酸（FeCl2 ，Fe
Cl3 溶液）をスプレー焙焼炉１でスプレー焙焼する際、
スプレー焙焼設備の操業に関し、燃焼バーナ４のｍ値を
調整し目的の品質の酸化鉄を得ようとするものである。
酸化鉄の品質である残留Ｃｌ分、粉体特性（収縮率、仮
焼成前後密度、平均粒径等）はスプレーヘッダー２より
スプレーされた粒子液滴が炉底に達するまでに受けた炉
内での熱履歴により決定される。スプレー粒子の受ける
熱履歴は炉内の旋回流の状態で大きく変化する。Waste hydrochloric acid (FeCl 2 , Fe generated by pickling steel sheets)
When spray roasting (Cl 3 solution) in the spray roasting furnace 1,
Regarding the operation of the spray roasting equipment, the m value of the combustion burner 4 is adjusted to obtain iron oxide of a desired quality.
The residual Cl content, which is the quality of iron oxide, and the powder characteristics (shrinkage rate, density before and after calcination, average particle diameter, etc.) are measured in the furnace where the particle droplets sprayed from the spray header 2 are received until they reach the furnace bottom. Determined by the thermal history of. The thermal history of spray particles changes greatly depending on the state of swirling flow in the furnace.
【００２０】本発明においては、焙焼炉胴部温度を一定
としながらｍ値を１．３〜１．７に操作しながら操業す
る。焙焼炉胴部温度は、前述したように、図１の感熱管
３により測定する。これを一定に制御することにより、
基本的に酸化鉄の品質を安定させることができる。同時
に、ｍ値（燃料が燃焼する時に必要な最低限の空気量
（理論燃料空気量）に対する比）を１．３〜１．７に制
御する。１．３未満だと燃焼温度上昇によるバーナータ
イルの溶融の問題が生じ、また、１．７超であると炉内
雰囲気温度が下がるとともに焙焼不完全の問題が生じ、
好ましくない。また、ガス量が増えたことによって、炉
内を負圧に制御するための吸引式のブロアの能力が不足
となる装置的な問題も生じる。このように両者を合わせ
て制御することにより、焙焼炉で生成する酸化鉄の粉体
特性値を実質的に残留Ｃｌとは無関係に制御することが
できる。In the present invention, the roasting furnace body is kept operating at a constant temperature while controlling the m value to be 1.3 to 1.7. The body temperature of the roasting furnace is measured by the heat sensitive tube 3 shown in FIG. 1, as described above. By controlling this to be constant,
Basically, the quality of iron oxide can be stabilized. At the same time, the m value (ratio to the minimum air amount (theoretical fuel air amount) required when the fuel burns) is controlled to 1.3 to 1.7. If it is less than 1.3, there is a problem of melting the burner tile due to an increase in combustion temperature, and if it is more than 1.7, there is a problem of lowering the atmosphere temperature in the furnace and incomplete roasting.
Not preferable. Further, due to the increase in the gas amount, there arises a systematic problem that the capacity of the suction blower for controlling the negative pressure in the furnace becomes insufficient. By controlling both of them in this way, it is possible to control the powder characteristic value of the iron oxide produced in the roasting furnace substantially independently of the residual Cl.
【００２１】次に、本発明の具体的な構成を挙げて説明
する。例えば、図１のようなスプレー焙焼炉１の操業は
焙焼胴部温度を管理指針とし一定操業を行っている。そ
の例としてスプレー量３．４m3/hr 、スプレー圧力３kg
/cm2でスプレーヘッダー２より廃塩酸をスプレーし、焙
焼している。燃料としてはコークス炉ガス（Ｃガス）を
用いている。実機操業の焙焼炉においてはＣガス燃焼バ
ーナ４は炉の周方向に４本あり、炉内に旋回流を形成す
るよう各々接線方向へ向けられている。炉内の代表温度
である胴部温度３は、燃焼バーナー位置より１．５ｍ上
部で炉内壁から約１０ｃｍ内部の点（雰囲気温度）を測
定しており、ｍ値を増加することで、旋回流が強まり、
感熱雰囲気温度は上昇する。その結果、感熱焙焼胴部温
度一定に操業を行うことで、使用燃料であるＣガス量が
減少するが、炉内旋回流速度は過剰空気量にて保たれて
おり、残留Ｃｌを抑えたままＳＨ−Ｄを制御することが
できる。それに対し、焙焼炉胴部温度だけで熱負荷を下
げると、旋回流が弱まり残留Ｃｌが上昇する。Next, a specific configuration of the present invention will be described. For example, in the operation of the spray roasting furnace 1 as shown in FIG. 1, the roasting barrel temperature is used as a guideline for constant operation. As an example, spray amount is 3.4 m 3 / hr, spray pressure is 3 kg.
The waste hydrochloric acid is sprayed from the spray header 2 at / cm 2 and roasted. Coke oven gas (C gas) is used as fuel. In an actual roasting furnace, there are four C gas combustion burners 4 in the circumferential direction of the furnace, and each is directed tangentially so as to form a swirling flow in the furnace. The body temperature 3 which is a representative temperature in the furnace is measured at a point (atmosphere temperature) within about 10 cm from the inner wall of the furnace 1.5 m above the combustion burner position. By increasing the m value, the swirling flow is increased. Became stronger,
The temperature of the heat-sensitive atmosphere rises. As a result, by operating the thermosensitive roasting drum at a constant temperature, the amount of C gas used as fuel is reduced, but the swirling velocity in the furnace is maintained at an excess air amount, and residual Cl is suppressed. The SH-D can be controlled as it is. On the other hand, if the heat load is reduced only by the temperature of the body of the roasting furnace, the swirling flow weakens and the residual Cl increases.
【００２２】[0022]
【実施例】以下に本発明を実施例に基づいて具体的に説
明する。 （実施例）図１に示す６×１４ｍの円筒状焙焼炉を用
い、スプレー量３．４m3/hr 、スプレー圧力３kg/cm2で
廃塩酸をスプレーし、焙焼した。このとき、焙焼炉胴部
温度およびｍ値を表１に示すように種々変えて粉体特性
値、残留Ｃｌに及ぼす影響を測定した。その結果を合わ
せて表１に示す。通常のｍ値、焙焼炉胴部温度に対する
ＳＨ−Ｄ１８．９に比較し、焙焼炉胴部温度を下げた比
較例では、Ｃガス量が減り、粒子が受ける熱負荷が下が
る結果、収縮率は上昇するが、それとともにＣｌも上昇
する。それに対し、焙焼炉胴部温度を一定としｍ値を上
げた発明例１では熱風旋回流は保たれ、Ｃｌ分は低下し
ながらＳＨ−Ｄを上げることが可能であった。またｍ値
を下げた発明例２では、ガス量が多くなり（投入熱量が
増加）、Ｃｌ、ＳＨ−Ｄともに低下した結果を得た。EXAMPLES The present invention will be specifically described below based on examples. (Example) Using a cylindrical roasting furnace of 6 × 14 m shown in FIG. 1, waste hydrochloric acid was sprayed at a spray amount of 3.4 m 3 / hr and a spraying pressure of 3 kg / cm 2 and roasted. At this time, the effects on the powder characteristic value and residual Cl were measured by changing the roasting furnace body temperature and m value variously as shown in Table 1. The results are shown together in Table 1. In a comparative example in which the temperature of the roasting furnace body was lowered compared to SH-D18.9 for the normal m value and the temperature of the roasting furnace body, the amount of C gas was reduced and the thermal load on the particles was reduced, resulting in shrinkage. The rate increases, but with it, Cl also increases. On the other hand, in Invention Example 1 in which the temperature of the body of the roasting furnace was kept constant and the m value was increased, the hot air swirl flow was maintained, and it was possible to increase SH-D while decreasing the Cl content. In addition, in Inventive Example 2 in which the m value was decreased, the amount of gas increased (the amount of heat input increased), and results were obtained in which both Cl and SH-D decreased.
【００２３】 [0023]
【００２４】[0024]
【発明の効果】以上のように、本発明により、管理温度
を一定とし燃焼ガスのｍ値を操作することにより、特開
昭６１−８６４２５号で問題であった、スプレー流量の
面での不経済性を克服し、残留Ｃｌを低く抑えたまま製
品酸化鉄の粉体特性を制御することが可能となった。As described above, according to the present invention, by controlling the m value of the combustion gas while keeping the control temperature constant, there is a problem in the spray flow rate, which is a problem in JP-A-61-86425. It has become possible to control the powder characteristics of the product iron oxide while overcoming the economical problems and keeping the residual Cl low.
【図面の簡単な説明】[Brief description of drawings]
【図１】スプレー焙焼炉の概略図である。FIG. 1 is a schematic view of a spray roasting furnace.
１ スプレー焙焼炉 ２ スプレーヘッダー ３ 感熱管 ４ 燃焼バーナ ５ 旋回流 1 spray roasting furnace 2 spray header 3 heat-sensitive tube 4 combustion burner 5 swirling flow
Claims (1)
炉でスプレー焙焼し、酸化鉄を製造する際、焙焼炉胴部
温度を一定としながら燃焼バーナーでの空気比ｍ値を
１．３〜１．７に操作することにより、焙焼炉で生成す
る酸化鉄の粉体特性値を実質的に残留Ｃｌとは無関係に
任意に制御することを特徴とするフェライト用酸化鉄の
製造方法。1. When iron oxide is produced by spray roasting waste hydrochloric acid generated by pickling steel sheet in a spray roasting furnace, the air ratio m value in the combustion burner is kept constant while keeping the temperature of the body of the roasting furnace constant. The iron oxide powder for ferrite is characterized in that the powder characteristic value of iron oxide produced in a roasting furnace is controlled arbitrarily regardless of residual Cl by operating 1.3 to 1.7. Production method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5188168A JP3046473B2 (en) | 1993-07-29 | 1993-07-29 | Production method of iron oxide for ferrite |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5188168A JP3046473B2 (en) | 1993-07-29 | 1993-07-29 | Production method of iron oxide for ferrite |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0741320A true JPH0741320A (en) | 1995-02-10 |
| JP3046473B2 JP3046473B2 (en) | 2000-05-29 |
Family
ID=16218947
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5188168A Expired - Fee Related JP3046473B2 (en) | 1993-07-29 | 1993-07-29 | Production method of iron oxide for ferrite |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3046473B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0850881A1 (en) * | 1996-12-27 | 1998-07-01 | Ruthner, Michael Johann, Dipl.Ing. Dr.mont. | Process and apparatus for the preparation of iron oxides from solutions containing hydrochloric acid iron oxide chloride |
| JP2006124241A (en) * | 2004-10-29 | 2006-05-18 | Jfe Steel Kk | Method and apparatus for manufacturing iron oxide |
| WO2008070885A3 (en) * | 2006-12-12 | 2008-09-25 | Gerhard Frithum | Method for increasing the specific surface of iron oxides in spray roasting plants |
-
1993
- 1993-07-29 JP JP5188168A patent/JP3046473B2/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0850881A1 (en) * | 1996-12-27 | 1998-07-01 | Ruthner, Michael Johann, Dipl.Ing. Dr.mont. | Process and apparatus for the preparation of iron oxides from solutions containing hydrochloric acid iron oxide chloride |
| US5911967A (en) * | 1996-12-27 | 1999-06-15 | Ruthner; Michael J. | Process and apparatus for production of ferric oxide from iron chloride solutions |
| JP2006124241A (en) * | 2004-10-29 | 2006-05-18 | Jfe Steel Kk | Method and apparatus for manufacturing iron oxide |
| JP4599991B2 (en) * | 2004-10-29 | 2010-12-15 | Ｊｆｅスチール株式会社 | Iron oxide production method and apparatus |
| WO2008070885A3 (en) * | 2006-12-12 | 2008-09-25 | Gerhard Frithum | Method for increasing the specific surface of iron oxides in spray roasting plants |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3046473B2 (en) | 2000-05-29 |
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