JPH09263801A - Finish heat treatment of iron and steel powder and finish heat treatment furnace - Google Patents

Finish heat treatment of iron and steel powder and finish heat treatment furnace

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Publication number
JPH09263801A
JPH09263801A JP8074535A JP7453596A JPH09263801A JP H09263801 A JPH09263801 A JP H09263801A JP 8074535 A JP8074535 A JP 8074535A JP 7453596 A JP7453596 A JP 7453596A JP H09263801 A JPH09263801 A JP H09263801A
Authority
JP
Japan
Prior art keywords
steel powder
iron
heat treatment
zone
gas
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.)
Pending
Application number
JP8074535A
Other languages
Japanese (ja)
Inventor
Hiroyuki Ishikawa
博之 石川
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.)
JFE Steel Corp
Original Assignee
Kawasaki Steel Corp
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 Kawasaki Steel Corp filed Critical Kawasaki Steel Corp
Priority to JP8074535A priority Critical patent/JPH09263801A/en
Publication of JPH09263801A publication Critical patent/JPH09263801A/en
Pending legal-status Critical Current

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Abstract

PROBLEM TO BE SOLVED: To provide a heat treatment method of iron and steel powder which operates while predicting the quantity of a product iron and steel powder after completing the heat treatment, and an apparatus therefor, in a continuous type moving bed furnace for executing the finish heat treatment of raw iron and steel powder. SOLUTION: At the time of executing the finish heat treatment of the raw iron and steel powder in the continuous type moving bed furnace divided into zones with partition walls 1 so as to independently execute at least two kinds of treatments among a reduction 3, decarburization 2 and denitrification 4 of the raw iron and steel powder, H2 O, CO and NH3 in gas sucked from each zone are analyzed. Further, one or more kinds among gaseous hydrogen flow quantity, steam flow quantity and raw iron and steel powder moving speed introduced into the corresponding zone, are adjusted so that the above analyzed values become the fixed values.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【発明の属する技術分野】本発明は、鉄鋼粉の仕上熱処
理方法及び装置に関し、詳しくは、粉末冶金製品及び磁
性材のような焼結体、あるいは粉末のままで使用される
鉄鋼粉を仕上熱処理する技術に係わる。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for finishing heat treatment of iron and steel powder, and more specifically, to a finish heat treatment of a powder metallurgy product and a sintered body such as a magnetic material, or a steel powder used as a powder. Involved in the technology.

【0002】[0002]

【従来の技術】一般に、工業的規模で鉄鋼粉を製造する
には、鉄鉱石粉やミルスケール粉の還元法、水、ガス、
油等の高圧流体を溶湯に噴射するアトマイズ法、鋼材の
切削加工で発生する所謂ダライ粉やショットを粉砕する
粉砕法、高炉スラグや鉄鋼粉を含むダスト類の粉砕と磁
選との組合せ法などが用いられる。これらの製法は、い
ずれも炭素、酸素、窒素等の不純物が目標値より相当高
い粗鉄鋼粉を一旦製造し、次に適切な仕上熱処理を施し
て該粗鉄鋼粉の脱炭、脱酸、脱窒等を行うものである。
そして、この熱処理には、移動床を有する連続式水平炉
が従来より用いられ、得られる鉄鋼粉の用途に応じ、上
記した脱炭、脱酸、脱窒または脱硫等が選択的に実施さ
れている。
2. Description of the Related Art Generally, in order to produce steel powder on an industrial scale, a reduction method of iron ore powder or mill scale powder, water, gas,
Atomizing method of injecting high-pressure fluid such as oil into molten metal, crushing method of crushing so-called Dalai powder and shot generated in cutting of steel, blast furnace slag and combination method of crushing dusts including iron and steel powder and magnetic separation Used. In all of these production methods, crude iron and steel powder in which impurities such as carbon, oxygen and nitrogen are considerably higher than the target value is once produced, and then an appropriate finishing heat treatment is performed to decarburize, deoxidize and deoxidize the crude iron and steel powder. For example, it is performed.
Then, for this heat treatment, a continuous horizontal furnace having a moving bed is conventionally used, and depending on the use of the obtained steel powder, decarburization, deoxidation, denitrification or desulfurization described above is selectively carried out. There is.

【0003】しかしながら、上記の粉末冶金用鉄鋼粉を
得ようとする場合、前記の脱炭、脱酸、脱窒が不十分で
あると、鉄鋼粉の機械的特性が向上しないという問題が
ある。また、粉末のままで使用する場合には、該粗鉄鋼
粉は金属鉄含有量が元々所望値より低いので、目標とす
る用途に合致しないという問題もある。そのため、粗鉄
鋼粉の仕上熱処理方法は、鉄鋼粉の製造においては重要
事項であり、従来より研究開発が多々行なわれている。
However, when obtaining the above-mentioned iron and steel powder for powder metallurgy, if the above-mentioned decarburization, deoxidation and denitrification are insufficient, there is a problem that the mechanical properties of the iron and steel powder are not improved. Further, when the powder is used as it is, since the content of metallic iron in the crude iron and steel powder is originally lower than the desired value, there is a problem that it does not meet the intended use. Therefore, the finish heat treatment method for crude iron and steel powder is an important item in the production of iron and steel powder, and research and development have been extensively carried out from the past.

【0004】例えば、特公昭57−58401号公報
は、前記移動床炉で水蒸気を含む水素中で脱炭と脱酸を
効率良く行う方法を開示している。また、特公昭58−
482号公報は、同様に移動床炉を用い、水素中の水蒸
気量を変えて脱炭あるいは脱酸を優先的に行う方法を提
案している。さらに、特開昭59−35601号公報
は、まず粗鉄鋼粉の脱炭、脱酸を行った後に、それを9
00〜550℃で徐冷してから脱窒を積極的に行う方法
を提案している。さらに加えて、特開昭61−1107
01号公報は、移動床炉の各処理空間を長手方向に複数
室に分割し、各処理工程を独立させた上で、移動床炉上
の粗鉄鋼粉が焼結する位置以降でファンにより雰囲気ガ
スを撹拌することによって、各室内での不要成分ガスの
滞留を防止する方法を開示している。
For example, Japanese Examined Patent Publication No. 57-58401 discloses a method for efficiently decarburizing and deoxidizing in a hydrogen containing steam in the moving bed furnace. In addition, Japanese Examined Japanese Patent Sho 58-
Japanese Patent No. 482 also proposes a method of preferentially performing decarburization or deoxidation by using a moving bed furnace and changing the amount of water vapor in hydrogen. Further, in JP-A-59-35601, crude iron and steel powder is first decarburized and deoxidized, and then
A method is proposed in which denitrification is positively performed after gradually cooling at 00 to 550 ° C. In addition, JP-A-61-1107
No. 01 gazette discloses that each processing space of a moving bed furnace is divided into a plurality of chambers in the longitudinal direction, each processing step is made independent, and after a position where crude iron and steel powder on the moving bed furnace is sintered, an atmosphere is generated by a fan. Disclosed is a method of preventing unnecessary component gas from staying in each chamber by stirring the gas.

【0005】しかしながら、上記先行技術を用いても、
実際に操業を行なうには熱処理終了後に炉から出された
製品鉄鋼粉中のC,O,N,Sを一定品質に保つよう
に、炉に供給する水素、水蒸気量、鉄粉移動速度等の操
業条件を調整しなければならない。ところが、還元、脱
炭および脱窒を連続的に行う現在の移動床炉には、炉か
ら出された鉄鋼粉中のC,O,N,Sの分析結果を得る
まで上記操業条件を調整できないという欠点があった。
換言すれば、仮に品質不良が発生したということが熱処
理終了後の製品鉄鋼粉の分析結果で判明しても、それか
ら操業条件を変えたのではアクションが遅すぎるという
問題があった。
However, even if the above prior art is used,
In order to actually perform the operation, the hydrogen, steam amount, iron powder transfer speed, etc. supplied to the furnace should be controlled so that C, O, N, S in the product steel powder discharged from the furnace after the heat treatment is maintained at a constant quality. The operating conditions must be adjusted. However, in the current moving bed furnace that continuously performs reduction, decarburization and denitrification, the above operating conditions cannot be adjusted until the analysis results of C, O, N and S in the iron and steel powder discharged from the furnace are obtained. There was a drawback.
In other words, even if it was found from the analysis result of the product steel powder after the heat treatment that the defective quality had occurred, there was a problem that the action would be too late if the operating conditions were changed.

【0006】[0006]

【発明が解決しようとする課題】本発明は、かかる事情
を鑑み、粗鉄鋼粉を仕上熱処理する連続式移動床炉にお
いて、熱処理終了後の製品鉄鋼粉の品質を予め予測しつ
つ操業する鉄鋼粉の熱処理方法及び装置を提供すること
を目的としている。
SUMMARY OF THE INVENTION In view of such circumstances, the present invention is a continuous moving bed furnace for finishing heat treatment of crude iron and steel powder, which operates while predicting the quality of the product steel powder after heat treatment in advance. It is an object of the present invention to provide a heat treatment method and device.

【0007】[0007]

【課題を解決するための手段】発明者は、上記目的を達
成するため鋭意研究し、以下の知見を得た。つまり、還
元、脱炭および脱窒は、それぞれ、 FeO(s)+H2 (g)=Fe(s)+H2 O(g) C(in Fe)+H2 O(g)=CO(g)+H2 (g) N(in Fe)+3/2H2 (g)=NH3 (g) なる反応で進行することが知られ、それぞれの反応過程
でH2 O、CO、NH3が生成される。そこで、発明者
は、連続式移動床炉の還元、脱炭及び脱窒ゾーンの雰囲
気ガス分析を行い、分析値と該炉から出された製品鉄鋼
粉のC,O,Nとの関係を調査した。その結果、各雰囲
気ガス中のH2 O、CO、NH3 の値から熱処理後の鉄
鋼粉中のC,O,Nが予測できることを見出し、本発明
を完成させた。
Means for Solving the Problems The inventor earnestly studied to achieve the above object and obtained the following findings. That is, reduction, decarburization, and denitrification are performed by FeO (s) + H 2 (g) = Fe (s) + H 2 O (g) C (in Fe) + H 2 O (g) = CO (g) + H, respectively. 2 (g) N (in Fe) + 3 / 2H 2 (g) = NH 3 (g) is known to proceed, and H 2 O, CO, and NH 3 are produced in each reaction process. Therefore, the inventor conducted an atmospheric gas analysis of the reduction, decarburization, and denitrification zones of a continuous moving bed furnace, and investigated the relationship between the analysis value and the C, O, and N of the product steel powder discharged from the furnace. did. As a result, they have found that C, O, N in the steel powder after heat treatment can be predicted from the values of H 2 O, CO, NH 3 in each atmosphere gas, and completed the present invention.

【0008】すなわち、本発明は、粗鉄鋼粉の還元、脱
炭および脱窒のうち少なくとも2種以上の処理を独立し
て行なえるよう仕切壁でゾーン分けした連続式移動床炉
内で粗鉄鋼粉を仕上熱処理するに際し、各ゾーンから吸
引したガス中のH2 O、CO、NH3 を分析すると共
に、それらの値が一定濃度になるよう該当するゾーンへ
導入する水素ガス流量、水蒸気流量及び粗鉄鋼粉移動速
度のうちからいずれか1種以上を調整することを特徴と
する鉄鋼粉の仕上熱処理方法である。
That is, according to the present invention, crude steel is provided in a continuous moving bed furnace zoned by partition walls so that at least two kinds of treatments such as reduction, decarburization and denitrification of crude iron and steel powder can be independently performed. During the finish heat treatment of the powder, H 2 O, CO, and NH 3 in the gas sucked from each zone are analyzed, and the hydrogen gas flow rate, steam flow rate and It is a finishing heat treatment method for iron and steel powders, characterized in that any one or more of the moving speeds of the crude iron and steel powders are adjusted.

【0009】また、本発明は、上記各ゾーンから吸引し
たガス中のH2 O、CO、NH3 を分析するに代え、各
ゾーンから所定の時間間隔で採取した粗鉄鋼粉のO,
C,Nを分析することを特徴とする鉄鋼粉の仕上熱処理
方法である。さらに、本発明は、粗鉄鋼粉の還元、脱炭
および脱窒のうち少なくとも2種以上の処理を独立して
行なえるよう仕切壁でゾーン分けした連続式移動床炉で
あって、各ゾーンを移動する鉄鋼粉層の直上ガスを吸引
するガスパイプと、吸引したガスのH2 O、CO、NH
3 を分析する分析装置と、その分析値が一定値になるよ
う炉内へ導く水素ガス流量、水蒸気流量及び粗鉄鋼粉移
動速度のうちからいずれか1種以上の値を求める演算制
御手段とを備えたことを特徴とする鉄鋼粉の仕上熱処理
炉である。
Further, according to the present invention, instead of analyzing H 2 O, CO, and NH 3 in the gas sucked from each of the above-mentioned zones, O and O of crude iron and steel powder collected from each zone at a predetermined time interval are analyzed.
It is a finish heat treatment method for iron and steel powder, characterized by analyzing C and N. Furthermore, the present invention is a continuous moving bed furnace in which each zone is divided into zones so that at least two kinds of treatments of reduction, decarburization and denitrification of crude iron and steel powder can be independently performed. Gas pipe for sucking the gas directly above the moving steel powder layer and H 2 O, CO, NH of the sucked gas
An analysis device for analyzing 3 and an operation control means for determining one or more of the hydrogen gas flow rate, the steam flow rate, and the crude iron and steel powder moving speed that are introduced into the furnace so that the analysis value becomes a constant value. It is a finishing heat treatment furnace for iron and steel powder, which is characterized by being provided.

【0010】加えて、本発明は、粗鉄鋼粉の還元、脱炭
及び脱窒のうち少なくとも2種以上の処理を独立して行
えるよう仕切壁でゾーン分けした連続式移動床炉であっ
て、各ゾーンを移動する鉄鋼粉層からその一部を所定の
時間間隔で採取するサンプリング手段と、採取した試料
のH,C,Nを分析する分析装置と、これら分析値が一
定値になるよう炉内へ導く水素ガス流量、水蒸気流量及
び粗鉄鋼粉移動速度のうちからいずれか1種以上の値を
求める演算制御手段とを備えたことを特徴とする鉄鋼粉
の仕上熱処理炉であり、あるいは、かかる仕上熱処理炉
に、各ゾーンを移動する鉄鋼粉層の直上ガスを吸引する
ガスパイプと、吸引したガスのH2 O、CO、NH3
連続分析する分析装置と、その分析値が一定値になるよ
う炉内へ導く水素ガス流量、水蒸気流量及び粗鉄鋼粉移
動速度のうちからいずれか1種以上の値を求める演算制
御手段とを追備したことを特徴とする鉄鋼粉の仕上熱処
理炉でもある。
In addition, the present invention is a continuous moving bed furnace zoned by partition walls so that at least two kinds of treatments of reduction, decarburization and denitrification of crude iron and steel powder can be independently performed. Sampling means for collecting a part of the iron and steel powder layer moving in each zone at a predetermined time interval, an analyzer for analyzing H, C, N of the collected sample, and a furnace for keeping these analyzed values constant. A finishing heat treatment furnace for iron and steel powder, comprising: an arithmetic and control unit for determining one or more of a hydrogen gas flow rate, a water vapor flow rate, and a crude iron and steel powder moving speed to be introduced into the interior. In the finishing heat treatment furnace, a gas pipe for sucking the gas directly above the iron and steel powder layer moving in each zone, an analyzer for continuously analyzing H 2 O, CO, NH 3 of the sucked gas, and its analysis value are kept constant. Hydrogen to be introduced into the furnace Scan rate, is also a heat treatment furnace finish steel powder, characterized in that it has Tsui備 and arithmetic control means for determining any one or more values from among the steam flow rate and crude steel powder moving speed.

【0011】本発明では、連続式移動床炉での粗鉄鋼粉
の仕上熱処理を上記のような形態で行うようにしたの
で、熱処理終了後の製品鉄鋼粉の品質を予め予測しつつ
操業でき、目標とする品質を有する鉄鋼粉が効率良く得
られるようになる。
In the present invention, since the finishing heat treatment of the crude iron and steel powder in the continuous moving bed furnace is performed in the above-described form, it is possible to operate while predicting the quality of the product steel powder after the heat treatment in advance. Steel powder having the target quality can be efficiently obtained.

【0012】[0012]

【発明の実施の形態】まず、本発明に係る仕上熱処理炉
の一例を図1に、そのA−A’,B−B’,C−C’矢
視図を図2に示す。それは、連続式移動床炉であって、
仕切壁1により脱炭ゾーン2,脱酸ゾーン3及び脱窒ゾ
ーン4の3室に分けられている。そして、各ゾーンに
は、ガス吹込管5が設置され、各ゾーンにそれぞれ必要
なガス成分を持つ雰囲気ガスを導入できるようになって
いる。導入された雰囲気ガスは、脱炭ゾーンに設置され
た排ガス管6から一括排出されるようになっている。な
お、図2に示すように、ガス吹込管5が各ゾーンに2本
づつ備えられている。
DESCRIPTION OF THE PREFERRED EMBODIMENTS First, an example of a finishing heat treatment furnace according to the present invention is shown in FIG. 1, and its AA ′, BB ′, CC ′ arrow view is shown in FIG. It is a continuous moving bed furnace,
The partition wall 1 divides the chamber into three chambers, a decarburizing zone 2, a deoxidizing zone 3 and a denitrifying zone 4. A gas blowing pipe 5 is installed in each zone so that an atmospheric gas having a necessary gas component can be introduced into each zone. The introduced atmosphere gas is collectively discharged from the exhaust gas pipe 6 installed in the decarburization zone. As shown in FIG. 2, two gas injection pipes 5 are provided in each zone.

【0013】処理対象の粗鉄鋼粉7は、原料ホッパ8か
らベルト9に供給され、表面を平滑にする金属板10で
平坦な層にされ、各ゾーン内を所定の速度で走行する。
ベルトの走行は、該処理炉の両端にあるホイール11の
回転で行なわれ、該炉の加熱は、該ベルトの上下に配置
されたラジアントチューブ12内を流れる高温燃焼ガス
により間接的に行われる。
The crude iron and steel powder 7 to be treated is supplied from the raw material hopper 8 to the belt 9 and formed into a flat layer by the metal plate 10 which smoothes the surface and travels in each zone at a predetermined speed.
The running of the belt is performed by rotation of wheels 11 at both ends of the processing furnace, and heating of the furnace is indirectly performed by high temperature combustion gas flowing in radiant tubes 12 arranged above and below the belt.

【0014】本発明の重要なポイントは、上記の各ゾー
ンに、ガスの吸引パイプ及び・又は粗鉄鋼粉の一部を採
取するサンプリング装置を設けると共に、採取したガス
を常時連続的に分析する分析装置18、又は所定の時間
間隔でサンプリングした粗鉄鋼粉を分析する装置を設け
ると共に、その分析情報を得て、各ゾーンに導入する水
素ガス流量、水蒸気流量、粗鉄鋼粉移動速度を演算する
演算制御手段15を設けたことである。
An important point of the present invention is that each of the above zones is provided with a gas suction pipe and / or a sampling device for sampling a part of the crude iron and steel powder, and an analysis for continuously and continuously analyzing the sampled gas. A device 18 or a device for analyzing the crude iron and steel powder sampled at a predetermined time interval is provided, and the analysis information is obtained to calculate the hydrogen gas flow rate, the water vapor flow rate, and the crude iron and steel powder moving speed to be introduced into each zone. That is, the control means 15 is provided.

【0015】次に、本発明に係る仕上熱処理方法を説明
する。具体的な操業条件として、炉温950℃に設定
し、脱窒ゾーン4に設置したガス吹込管5から水素を1
00〜200Nm3 /hr、脱酸ゾーン3に設置したガ
ス吹込管5から水素を50〜100Nm3 、脱炭ゾーン
2に設置したガス吹込管5から水蒸気を0〜40kg/
hrの範囲で変更導入できるようにした。このように設
定された前記仕上熱処理炉に、酸素量0.5〜0.70
wt%、炭素量0.15〜0.5wt%、窒素量0.0
060〜0.013wt%を含有する粗鉄鋼粉を送込
み、仕上熱処理を施した。その際、各ゾーンの分析した
雰囲気ガス中のH2 O、CO、NH3 濃度から仕上熱処
理後の製品鉄鋼粉のC,O,N量の予測には、予め同一
条件で求めておいた図3〜5に示すような各ゾーンのH
2 O、CO、NH3 ガス成分と処理終了後の製品鉄鋼粉
中のC,O,Nとの関係を利用した。
Next, the finish heat treatment method according to the present invention will be described. As a concrete operating condition, the furnace temperature is set to 950 ° C., and hydrogen is supplied from the gas injection pipe 5 installed in the denitrification zone 4 to 1
0 to 200 Nm 3 / hr, 50 to 100 Nm 3 of hydrogen from the gas injection pipe 5 installed in the deoxidation zone 3, and 0 to 40 kg of water vapor from the gas injection pipe 5 installed in the decarburization zone 2.
The change can be introduced within the range of hr. In the finishing heat treatment furnace thus set, the amount of oxygen is 0.5 to 0.70.
wt%, carbon amount 0.15-0.5 wt%, nitrogen amount 0.0
Crude steel powder containing 060 to 0.013 wt% was fed and subjected to finish heat treatment. At that time, in order to predict the C, O, and N amounts of the product steel powder after the finish heat treatment from the H 2 O, CO, and NH 3 concentrations in the analyzed atmospheric gas of each zone, the figure obtained in advance under the same conditions H of each zone as shown in 3-5
The relationship between 2 O, CO, NH 3 gas components and C, O, N in the product steel powder after the treatment was used.

【0016】つまり、脱炭ゾーンについて見れば(図3
参照)、製品鉄鋼粉のC量を0.005 wt%にする
場合には、脱炭ゾーンの雰囲気ガス中のCO濃度を3
vol%にする必要がある。そのため、該ゾーンからの
吸引ガスを常時連続分析して、そのCO濃度分析値が
5.0 vol% の場合には、予め図8に示すような
水素ガス流量と雰囲気中のCO量との関係がインプット
されている前記演算制御手段の助けを借りて、該ゾーン
へ供給する適切な水素ガス流量を演算し、演算値(16
0Nm3 /hr)に変更、調整するのである。上記のよ
うに水素ガス流量を調整する代わりに、図9に示されて
いるような粗鉄鋼粉移動速度と雰囲気中のCO量(vo
l%)との関係がインプットされている前記演算制御手
段の助けを借りて、適切な粗鉄鋼粉移動速度を演算し、
演算値(例えば、40cm/min)に変更、調整して
もよい。なお、脱酸ゾーン及び脱窒ゾーンでも上記と類
似の操作を行いつつ操業することになる。
That is, looking at the decarburization zone (see FIG.
When the C content of the product steel powder is set to 0.005 wt%, the CO concentration in the atmosphere gas in the decarburization zone should be 3%.
It must be vol%. Therefore, when the suction gas from the zone is always continuously analyzed and the CO concentration analysis value is 5.0 vol%, the relationship between the hydrogen gas flow rate and the CO amount in the atmosphere as shown in FIG. With the help of the arithmetic control means that is input, the appropriate hydrogen gas flow rate to be supplied to the zone is calculated, and the calculated value (16
0 Nm 3 / hr). Instead of adjusting the flow rate of hydrogen gas as described above, the moving speed of crude iron and steel powder and the amount of CO in the atmosphere (vo
1%) is input, with the aid of the arithmetic control means, the proper crude iron and steel powder movement speed is calculated,
You may change and adjust to a calculated value (for example, 40 cm / min). In the deoxidizing zone and the denitrifying zone, the operation is performed while performing the same operation as above.

【0017】かかる操業を行えば、還元ゾーン、脱炭ゾ
ーンおよび脱窒ゾーンでのH2 O、CO、NH3 ガス成
分から熱処理後の鉄粉中のC,O,Nが予測できた。し
たがって、熱処理後に炉から出された鉄鋼粉中のC,
O,Nの分析を待たずに、各ゾーンの雰囲気ガス分析に
より仕上熱処理の操業コントロールができるようになっ
た。
By carrying out such an operation, it was possible to predict C, O and N in the iron powder after the heat treatment from the H 2 O, CO and NH 3 gas components in the reduction zone, the decarburization zone and the denitrification zone. Therefore, C in iron and steel powder discharged from the furnace after heat treatment,
The operation of finishing heat treatment can be controlled by analyzing the atmospheric gas in each zone without waiting for the analysis of O and N.

【0018】なお、鉄鋼粉の一部を採取し、その分析値
が目標に一致するように制御した場合に使用した関係
を、図6〜7に示しておく。
6 to 7 show the relationships used when a part of the iron and steel powder was sampled and controlled so that the analysis value thereof would match the target.

【0019】[0019]

【発明の効果】連続式移動床炉における操業の効率化を
達成した。
The efficiency of the operation in the continuous moving bed furnace has been achieved.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明に係る仕上熱処理炉の一例を示す縦断面
図である。
FIG. 1 is a vertical sectional view showing an example of a finishing heat treatment furnace according to the present invention.

【図2】図1のA−A’,B−B’及びC−C’矢視図
である。
FIG. 2 is a view taken along arrows AA ′, BB ′ and CC ′ of FIG.

【図3】本発明に係る仕上熱処理方法に使用する製品鉄
鋼粉中のC量(wt%)と脱炭ゾーンの雰囲気ガス中の
CO vol%との関係を示す図である。
FIG. 3 is a diagram showing the relationship between the C content (wt%) in the product steel powder used in the finish heat treatment method according to the present invention and the CO vol% in the atmosphere gas in the decarburization zone.

【図4】本発明に係る仕上熱処理方法に使用する製品鉄
鋼粉中のN量(wt ppm)と脱窒ゾーンの雰囲気ガ
ス中のNH3 vol%との関係を示す図である。
FIG. 4 is a diagram showing the relationship between the amount of N (wt ppm) in the product steel powder used in the finish heat treatment method according to the present invention and NH 3 vol% in the atmosphere gas in the denitrification zone.

【図5】本発明に係る仕上熱処理方法に使用する製品鉄
鋼粉中のO量(wt%)と還元ゾーンの雰囲気ガス中の
2 O vol%との関係を示す図である。
FIG. 5 is a diagram showing the relationship between the O amount (wt%) in the product steel powder used in the finish heat treatment method according to the present invention and the H 2 O vol% in the atmosphere gas in the reduction zone.

【図6】本発明に係る仕上熱処理方法に使用する製品鉄
鋼粉中のC量(wt%)と還元ゾーンで採取した試料中
のC vol%との関係を示す図である。
FIG. 6 is a diagram showing the relationship between the C content (wt%) in the product steel powder used in the finish heat treatment method according to the present invention and the C vol% in the sample collected in the reduction zone.

【図7】本発明に係る仕上熱処理方法に使用する製品鉄
鋼粉中のO量(wt%)と脱窒ゾーンで採取した試料中
のC vol%との関係を示す図である。
FIG. 7 is a diagram showing the relationship between the O content (wt%) in the product steel powder used in the finish heat treatment method according to the present invention and the C vol% in the sample collected in the denitrification zone.

【図8】本発明に係る仕上熱処理方法に使用する水素ガ
ス流量と雰囲気中のCO濃度(vol%)との関係を示
す図である。
FIG. 8 is a diagram showing the relationship between the flow rate of hydrogen gas used in the finish heat treatment method according to the present invention and the CO concentration (vol%) in the atmosphere.

【図9】本発明に係る仕上熱処理方法に使用する粗鉄鋼
粉移動速度と雰囲気中のCO濃度(vol%)との関係
を示す図である。
FIG. 9 is a diagram showing the relationship between the moving speed of crude iron and steel powder used in the finishing heat treatment method according to the present invention and the CO concentration (vol%) in the atmosphere.

【符号の説明】[Explanation of symbols]

1 仕切壁 2 脱炭ゾーン 3 脱酸ゾーン 4 脱窒ゾーン 5 ガス吹込管 6 排ガス管 7 粗鉄鋼粉 8 原料ホッパ 9 ベルト 10 金属板 11 ホイール 12 ラジアント・チューブ 13 ガス吸引管 14 サンプリング手段 15 演算制御手段 16 供給ガス(水素ガス/水蒸気) 17 排ガス 18 分析装置 1 Partition Wall 2 Decarburization Zone 3 Deoxidation Zone 4 Denitrification Zone 5 Gas Injection Pipe 6 Exhaust Gas Pipe 7 Crude Steel Powder 8 Raw Material Hopper 9 Belt 10 Metal Plate 11 Wheel 12 Radiant Tube 13 Gas Suction Pipe 14 Sampling Means 15 Computation Control Means 16 Supply gas (hydrogen gas / steam) 17 Exhaust gas 18 Analyzer

Claims (5)

【特許請求の範囲】[Claims] 【請求項1】 粗鉄鋼粉の還元、脱炭および脱窒のうち
少なくとも2種以上の処理を独立して行なえるよう仕切
壁でゾーン分けした連続式移動床炉内で粗鉄鋼粉を仕上
熱処理するに際し、 各ゾーンから吸引したガス中のH2 O、CO、NH3
分析すると共に、それらの値が一定濃度になるよう該当
するゾーンへ導入する水素ガス流量、水蒸気流量及び粗
鉄鋼粉移動速度のうちからいずれか1種以上を調整する
ことを特徴とする鉄鋼粉の仕上熱処理方法。
1. Finishing heat treatment of crude iron and steel powder in a continuous moving bed furnace zoned by partition walls so that at least two or more treatments of reduction, decarburization and denitrification of crude iron and steel powder can be performed independently. In doing so, analyze the H 2 O, CO, and NH 3 in the gas sucked from each zone, and introduce hydrogen gas flow rate, water vapor flow rate, and coarse iron and steel powder flow into the corresponding zone so that their values will be constant concentrations. A finishing heat treatment method for iron and steel powder, characterized in that any one or more of the speeds is adjusted.
【請求項2】 上記各ゾーンから吸引したガス中のH2
O、CO、NH3 を分析するに代え、各ゾーンから所定
の時間間隔で採取した粗鉄鋼粉のO,C,Nを分析する
ことを特徴とする請求項1記載の鉄鋼粉の仕上熱処理方
法。
2. H 2 in the gas sucked from each zone
The finishing heat treatment method for iron and steel powder according to claim 1, characterized in that instead of analyzing O, CO, and NH 3 , O, C, and N of the crude iron and steel powder collected at predetermined time intervals from each zone are analyzed. .
【請求項3】 粗鉄鋼粉の還元、脱炭および脱窒のうち
少なくとも2種以上の処理を独立して行なえるよう仕切
壁でゾーン分けした連続式移動床炉であって、 各ゾーンを移動する鉄鋼粉層の直上ガスを吸引するガス
パイプと、吸引したガスのH2 O、CO、NH3 を分析
する分析装置と、その分析値が一定値になるよう炉内へ
導く水素ガス流量、水蒸気流量及び粗鉄鋼粉移動速度の
うちからいずれか1種以上の値を求める演算制御手段と
を備えたことを特徴とする鉄鋼粉の仕上熱処理炉。
3. A continuous moving bed furnace divided into zones by partition walls so that at least two kinds of treatments such as reduction, decarburization and denitrification of crude iron and steel powder can be independently performed, and each zone is moved. Gas pipe for sucking gas directly above the iron and steel powder layer, an analyzer for analyzing H 2 O, CO, and NH 3 of the sucked gas, and a hydrogen gas flow rate and steam for guiding the analyzed value to a constant value in the furnace. A finishing heat treatment furnace for iron and steel powder, comprising: an arithmetic and control unit that determines one or more values from the flow rate and the crude iron and steel powder moving speed.
【請求項4】 粗鉄鋼粉の還元、脱炭及び脱窒のうち少
なくとも2種以上の処理を独立して行えるよう仕切壁で
ゾーン分けした連続式移動床炉であって、 各ゾーンを移動する鉄鋼粉層からその一部を所定の時間
間隔で採取するサンプリング手段と、採取した試料の
O,C,Nを分析する分析装置と、これら分析値が一定
値になるよう炉内へ導く水素ガス流量、水蒸気流量及び
粗鉄鋼粉移動速度のうちからいずれか1種以上の値を求
める演算制御手段を備えたことを特徴とする鉄鋼粉の仕
上熱処理炉。
4. A continuous moving bed furnace divided into zones by partition walls so that at least two kinds of treatments of reduction, decarburization and denitrification of crude iron and steel powder can be independently performed, and each zone is moved. Sampling means for sampling a part of the iron and steel powder layer at predetermined time intervals, analyzer for analyzing O, C, N of the sample, and hydrogen gas for guiding the analyzed values to a constant value in the furnace. A finishing heat treatment furnace for iron and steel powder, comprising arithmetic and control means for determining one or more of a flow rate, a steam flow rate, and a moving speed of crude iron and steel powder.
【請求項5】 各ゾーンを移動する鉄鋼粉層の直上ガス
を吸引するガスパイプと、吸引したガスのH2 O、C
O、NH3 を分析する分析装置と、その分析値が一定値
になるよう炉内へ導く水素ガス流量、水蒸気流量及び粗
鉄鋼粉移動速度のうちからいずれか1種以上の値を求め
る演算制御手段と追備したことを特徴とする請求項4記
載の鉄鋼粉の仕上熱処理炉。
5. A gas pipe for sucking a gas directly above the steel powder layer moving in each zone, and H 2 O and C of the sucked gas.
O, the analyzer for analyzing NH 3, and the hydrogen gas flow rate the analysis value leads to such a furnace becomes a constant value, the arithmetic control for obtaining any one or more values from among the steam flow rate and crude steel powder moving speed The finishing heat treatment furnace for iron and steel powder according to claim 4, further comprising a means.
JP8074535A 1996-03-28 1996-03-28 Finish heat treatment of iron and steel powder and finish heat treatment furnace Pending JPH09263801A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8074535A JPH09263801A (en) 1996-03-28 1996-03-28 Finish heat treatment of iron and steel powder and finish heat treatment furnace

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8074535A JPH09263801A (en) 1996-03-28 1996-03-28 Finish heat treatment of iron and steel powder and finish heat treatment furnace

Publications (1)

Publication Number Publication Date
JPH09263801A true JPH09263801A (en) 1997-10-07

Family

ID=13550088

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8074535A Pending JPH09263801A (en) 1996-03-28 1996-03-28 Finish heat treatment of iron and steel powder and finish heat treatment furnace

Country Status (1)

Country Link
JP (1) JPH09263801A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6303077B1 (en) 1997-05-27 2001-10-16 Höganäs Ab Method of monitoring and controlling the composition of sintering atmosphere
CN108088252A (en) * 2016-11-23 2018-05-29 中冶长天国际工程有限责任公司 A kind of injection assisted sintering method gas concentration accurate control device and its control method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6303077B1 (en) 1997-05-27 2001-10-16 Höganäs Ab Method of monitoring and controlling the composition of sintering atmosphere
CN108088252A (en) * 2016-11-23 2018-05-29 中冶长天国际工程有限责任公司 A kind of injection assisted sintering method gas concentration accurate control device and its control method

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