JP2014214327A - Iron dust finishing heat treatment method and finishing heat treatment device - Google Patents

Iron dust finishing heat treatment method and finishing heat treatment device Download PDF

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JP2014214327A
JP2014214327A JP2013090392A JP2013090392A JP2014214327A JP 2014214327 A JP2014214327 A JP 2014214327A JP 2013090392 A JP2013090392 A JP 2013090392A JP 2013090392 A JP2013090392 A JP 2013090392A JP 2014214327 A JP2014214327 A JP 2014214327A
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iron powder
heat treatment
chamber
finishing heat
treatment apparatus
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滋之 齋藤
Shigeyuki Saito
滋之 齋藤
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JFE Steel Corp
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JFE Steel Corp
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/14—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment
    • F27B9/20—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace
    • F27B9/24—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace being carried by a conveyor

Abstract

PROBLEM TO BE SOLVED: To provide a finishing heat treatment device capable of continuously and efficiently performing decarbonization, deoxidation, and denitrification related to finishing heat treatment of iron dust even when a production amount is more than conventional amounts.SOLUTION: The finishing heat treatment device comprises: a levelling plate 3 having irregularities; and a driving device disposed on the levelling plate 3. Thereby, to an iron dust layer 2, irregularities can be formed. As a result, decarbonization, deoxidation, and denitrification can be performed more efficiently.

Description

本発明は、粉末冶金用または粉末のままで利用する用途に適する鉄粉を得るための鉄粉の仕上熱処理方法および仕上熱処理装置に関するものである。   The present invention relates to an iron powder finish heat treatment method and a finish heat treatment apparatus for obtaining iron powder suitable for use in powder metallurgy or used as powder.

粉末冶金技術は、複雑な形状の機械部品を、極めて高い寸法精度で生産できるので、その機械部品の製造コストを大幅に低減することが可能である。そのため、粉末冶金技術を適用して製造した各種の機械部品が多方面に利用されている。   Since powder metallurgy technology can produce machine parts with complicated shapes with extremely high dimensional accuracy, the manufacturing cost of the machine parts can be greatly reduced. Therefore, various machine parts manufactured by applying the powder metallurgy technique are used in various fields.

上述の粉末冶金に用いられる鉄粉の工業的な製造装置としては、鉄鉱石粉やミルスケール粉の還元装置や、水、ガス、油などの高圧流体を溶湯に噴射するアトマイズ装置、鋼材の切削加工で発生するダライコやショットを粉砕する粉砕装置、高炉スラグや鉄粉を含むダスト類の粉砕と磁選とを組み合せた製造装置などがある。
これらの製造装置では、いずれもまず炭素、酸素、窒素などの不純物が目標とする値より高い粗製鉄鋼粉（以下、粗製粉または単に鉄粉と略す）を製造し、ついで適切な仕上熱処理によって粗製粉の脱炭、脱酸および脱窒を行う。しかし、粉末治金用鉄粉（以下、製品粉ともいう）を得ようとした場合、仕上熱処理における脱炭、脱酸および脱窒が不充分であると、製品粉の圧縮性や、その製品粉を用いた焼結体の機械的特性が向上しないという問題がある。 Industrial production equipment for iron powder used in the above-mentioned powder metallurgy includes iron ore powder and mill scale powder reduction equipment, atomizing equipment that injects high-pressure fluids such as water, gas, and oil into the molten metal, and steel cutting. There are pulverizers that pulverize darikos and shots generated in blast furnaces, and manufacturing apparatuses that combine pulverization of blast furnace slag and dust containing iron powder with magnetic separation.
In each of these production apparatuses, first, a crude steel powder (hereinafter, abbreviated as “crude powder” or simply “iron powder”) in which impurities such as carbon, oxygen, and nitrogen are higher than target values is produced, and then coarsely processed by an appropriate finish heat treatment. Perform decarburization, deoxidation and denitrification of milling. However, when trying to obtain iron powder for powder metallurgy (hereinafter also referred to as product powder), if the decarburization, deoxidation and denitrification in the finish heat treatment are insufficient, the product powder compressibility and the product There is a problem that the mechanical properties of the sintered body using powder do not improve.

また、上記粉末治金用鉄粉を、粉末のままで使用する場合であっても、金属鉄の濃度が所望の値より低くなって、目的とする用途に合致しないことが多い。
そこで、従来から、粗製粉の仕上熱処理に供する装置につき種々研究がなされている。 Even when the powder metallurgy iron powder is used as a powder, the concentration of metallic iron is often lower than a desired value and does not match the intended application.
Therefore, various studies have been made on apparatuses used for finishing heat treatment of coarse flour.

例えば、特許文献１では、油アトマイズ粗製粉を連続式移動床炉の移動床上に供給し、移動床上の粗製粉を非酸化性ガス雰囲気に保った予熱装置内で550〜1200℃に加熱し、ついで非酸化性ガス雰囲気を保った冷却装置内で冷却することによって、脱炭を能率よく行う仕上熱処理装置を開示している。
その際の炉構造は、前記移動床炉の上流側の上方に粗製粉を供給する供給装置と、その供給装置の下流側に設けられた非酸化性ガス供給系に接続した予熱室と、その予熱室の下流側に設けられ脱炭性ガス供給系に接続した脱炭室と、その脱炭室の下流側に設けられ非酸化性ガス供給系に接続した冷却室とから構成した装置であり、また、予熱室と脱炭室との境界や、脱炭室と冷却室との境界、あるいはその両方に、脱炭室のガスが予熱室または冷却室に混入することを防ぐ中空構造のガス流出壁が設けられていることなどが記載されている。
特許文献１にはさらに、脱炭性ガス中に混入した脱炭反応阻害成分を除去しながら、脱炭性ガスを循環使用する装置についても記載されている。 For example, in Patent Document 1, oil atomized coarse powder is supplied onto a moving bed of a continuous moving bed furnace, and the coarse powder on the moving bed is heated to 550 to 1200 ° C. in a preheating device maintained in a non-oxidizing gas atmosphere. Next, a finishing heat treatment apparatus is disclosed in which decarburization is efficiently performed by cooling in a cooling apparatus that maintains a non-oxidizing gas atmosphere.
The furnace structure at that time includes a supply device for supplying the coarse powder above the upstream side of the moving bed furnace, a preheating chamber connected to a non-oxidizing gas supply system provided on the downstream side of the supply device, A decarburization chamber provided downstream of the preheating chamber and connected to the decarburization gas supply system, and a cooling chamber provided downstream of the decarburization chamber and connected to the non-oxidizing gas supply system. In addition, a gas having a hollow structure that prevents the decarburization chamber gas from entering the preheating chamber or the cooling chamber at the boundary between the preheating chamber and the decarburizing chamber, the boundary between the decarburizing chamber and the cooling chamber, or both. It is described that an outflow wall is provided.
Patent Document 1 further describes an apparatus that circulates and uses a decarburized gas while removing a decarburization reaction inhibiting component mixed in the decarburized gas.

また、特許文献２には、仕上熱処理装置として、磁場と水分とを用いることによって、粗製粉層の通気性を改善し、熱処理の効率を上げる装置が示されている。   Patent Document 2 discloses an apparatus that improves the air permeability of the coarse powder layer and increases the efficiency of heat treatment by using a magnetic field and moisture as a finish heat treatment apparatus.

さらに、特許文献３には、連続式移動床炉に進行方向に直交する仕切壁を設けて順次脱炭室、脱酸室および脱窒室の３室に分割し、さらに粗製粉充填層の表面に凹凸を形成する装置を該移動床炉の原料入口近傍に配設して、脱窒室に還元ガス流入口を設けると供に、前記各室の仕切壁に前記還元ガスが通り抜けるガス通路と、脱炭室にガス排出口とを設けて、移動床進行方向と逆向したガス流を形成し、さらに、脱炭室の還元ガス流上流側に水蒸気を吹き込む加湿器を付設して、各室内の天井に、室内の雰囲気ガスを攪拌するファンを設けた粗製粉の仕上熱処理装置が記載されている。
加えて、特許文献３は、上記凹凸を形成する装置の充填部擦切り板の下端を水平直線でなく凹凸状とすることによって、粗製粉層の上面を平坦面でなく畝状とし、粗製粉層の表面積を増すことで、粗製粉層の反応効率を高めるという技術を提案している。 Further, in Patent Document 3, a partition wall orthogonal to the traveling direction is provided in a continuous moving bed furnace, and sequentially divided into three chambers, a decarburization chamber, a deoxidation chamber, and a denitrification chamber, and further the surface of the coarse powder packed bed A gas passage through which the reducing gas passes through the partition walls of the chambers, and an apparatus for forming irregularities is provided in the vicinity of the raw material inlet of the moving bed furnace, and a reducing gas inlet is provided in the denitrification chamber. The decarburization chamber is provided with a gas discharge port to form a gas flow opposite to the moving bed traveling direction, and a humidifier for blowing water vapor is attached to the decarburization chamber upstream of the reducing gas flow. Describes a finishing heat treatment apparatus for a coarse powder provided with a fan for stirring an atmospheric gas in a room.
In addition, Patent Document 3 discloses that the upper surface of the coarse powder layer is not a flat surface but a bowl shape by making the lower end of the filling part scraping plate of the apparatus for forming the unevenness an uneven shape instead of a horizontal straight line. Has proposed a technique to increase the reaction efficiency of the coarse powdered layer by increasing the surface area of.

特開昭58-19401号公報JP-A-58-19401 特開平9-17002号公報Japanese Patent Laid-Open No. 9-17002 特開昭61-284502号公報JP-A-61-284502

しかしながら、特許文献１に示された技術は、脱炭のみ行うものであり、脱炭、脱酸および脱窒の仕上熱処理を連続的に行う装置ではない。また、使用すべき雰囲気ガスの露点については何も記載されておらず、予熱室、脱炭室、冷却室での雰囲気ガスの流れは、各室の圧力差のみで制御しており、各室内でのガス流速を増大させる工夫がされていない。従って、この技術では、鉄鋼粉の脱炭、脱酸および脱窒を連続的に進める仕上熱処理を行うことはできない。   However, the technique disclosed in Patent Document 1 performs only decarburization, and is not an apparatus that continuously performs finish heat treatment for decarburization, deoxidation, and denitrification. In addition, there is no description about the dew point of the atmospheric gas to be used, and the flow of atmospheric gas in the preheating chamber, decarburization chamber, and cooling chamber is controlled only by the pressure difference between the chambers. There has been no contrivance to increase the gas flow rate at. Therefore, with this technique, it is not possible to perform a finish heat treatment that continuously advances decarburization, deoxidation, and denitrification of steel powder.

また、特許文献２に示された技術は、従来よりも過剰な水分を必要とするため、反応炉内の露点が過度に上昇し、脱酸反応を効果的に促進することができないという問題があった。   Moreover, since the technique shown by patent document 2 requires an excess water | moisture content conventionally, the dew point in a reaction furnace rises too much, and there exists a problem that a deoxidation reaction cannot be accelerated | stimulated effectively. there were.

さらに、特許文献３に示された技術は、特許文献１および２と異なり、脱炭、脱酸および脱窒反応を１台で行うことができるものの、鉄粉の安息角が律速となって、鉄粉層の表面積の増加効果は限定的であった。
特に、近年の粉末冶金用鉄粉の需要の高まりに対する増産の要請を満足しようとして、上記特許文献３に記載された技術を用いた場合、脱炭、脱酸および脱窒反応の効果が、前記凹凸を形成する装置を用いない装置のレベルにまで低下してしまうことが、発明者らの検討によって明らかとなった。 Furthermore, the technique shown in Patent Document 3 is different from Patent Documents 1 and 2, although decarburization, deoxidation, and denitrification reactions can be performed with one unit, the angle of repose of iron powder becomes rate-limiting, The effect of increasing the surface area of the iron powder layer was limited.
In particular, when the technique described in Patent Document 3 is used in an attempt to satisfy the demand for increased production for the recent increase in demand for iron powder for powder metallurgy, the effects of decarburization, deoxidation, and denitrification reactions are It has been clarified by examination of the inventors that the level is lowered to the level of an apparatus that does not use an apparatus for forming irregularities.

本発明は、上記の現状に鑑み開発されたもので、従来よりも生産量の多い場合であっても鉄粉の脱炭、脱酸および脱窒反応を連続的かつ効率的に進めることができる仕上熱処理装置を、その仕上熱処理方法と共に提供することを目的とする。   The present invention has been developed in view of the above situation, and can continuously and efficiently proceed decarburization, deoxidation, and denitrification of iron powder even when the production amount is larger than the conventional one. An object is to provide a finish heat treatment apparatus together with the finish heat treatment method.

本発明の要旨構成は次のとおりである。
１．移動床の進行方向から順に、鉄粉装入部、脱炭室、脱酸室、脱窒室を備える鉄粉の仕上熱処理装置において、該鉄粉装入部に、凹凸を有する擦切り板を設け、さらに該擦切り板に駆動装置を設けた鉄粉の仕上熱処理装置。 The gist of the present invention is as follows.
1. In order of the iron powder finishing heat treatment equipment, which is equipped with an iron powder charging section, decarburization chamber, deoxidation chamber, and denitrification chamber in order from the moving direction of the moving floor, a scraping plate having irregularities is provided in the iron powder charging section. Further, a finish heat treatment apparatus for iron powder in which a driving device is provided on the scraping plate.

２．移動床の進行方向から順に、鉄粉装入部、脱炭室、脱酸室、脱窒室を備える鉄粉の仕上熱処理装置において、該鉄粉装入部に、凹凸を有し、かつ回転するローラーを設け、さらに該ローラーの駆動装置を設けた鉄粉の仕上熱処理装置。 2. In the iron powder finishing heat treatment apparatus, which is equipped with an iron powder charging section, a decarburization chamber, a deoxidation chamber, and a denitrification chamber in order from the moving direction of the moving bed, the iron powder charging section has irregularities and rotates. An iron powder finishing heat treatment apparatus provided with a roller for carrying out the operation and further provided with a driving device for the roller.

３．前記１に記載の駆動装置および擦切り板を備えた鉄粉の仕上熱処理装置を用いる鉄粉の仕上熱処理方法であって、上記仕上熱処理装置に鉄粉を装入するに際し、上記駆動装置を用いて、上記擦切り板を搖動させ、上記鉄粉からなる鉄粉層に凹凸を成形する鉄粉の仕上熱処理方法。 3. An iron powder finish heat treatment method using the iron powder finish heat treatment apparatus provided with the drive apparatus and scraping plate according to 1 above, and when the iron powder is charged into the finish heat treatment apparatus, the drive apparatus is used. A finishing heat treatment method for iron powder, in which the scraping plate is rocked to form irregularities in the iron powder layer made of the iron powder.

４．前記駆動装置を用いて、擦切り板を、上下方向、左右方向および上下左右方向のうちから選んだ少なくとも一つの方向に揺動させる前記３に記載の鉄粉の仕上熱処理方法。 4). 4. The method for finishing heat treatment of iron powder according to 3 above, wherein the scraping plate is swung in at least one direction selected from the vertical direction, the horizontal direction, and the vertical and horizontal directions using the driving device.

５．前記２に記載の駆動装置およびローラーを備えた鉄粉の仕上熱処理装置を用いる鉄粉の仕上熱処理方法であって、上記仕上熱処理装置に鉄粉を装入するに際し、上記駆動装置によって、上記ローラーを、回転させ、さらに上下方向、左右方向および上下左右方向のうちから選んだ少なくとも一つの方向に揺動させる鉄粉の仕上熱処理方法。 5. The iron powder finish heat treatment method using the iron powder finish heat treatment apparatus provided with the drive device and the roller according to 2 above, wherein when the iron powder is charged into the finish heat treatment apparatus, the roller is moved by the drive device. A finish heat treatment method of iron powder that is further rotated and rocked in at least one direction selected from the vertical direction, the horizontal direction, and the vertical and horizontal directions.

本発明によれば、従来よりも生産量の多い場合であっても、効果的に脱炭、脱酸および脱窒された粉末冶金用鉄粉を得ることができる。   According to the present invention, iron powder for powder metallurgy that has been effectively decarburized, deoxidized, and denitrified can be obtained even in the case where the production amount is larger than the conventional one.

本発明に従う仕上熱処理装置の縦断面図である。It is a longitudinal cross-sectional view of the finish heat processing apparatus according to this invention. (a)、(b)は、図１に記載の装置に用いる擦切り板の正面図である。(a), (b) is a front view of the scraping board used for the apparatus of FIG. 本発明に従う他の仕上熱処理装置の縦断面図である。It is a longitudinal cross-sectional view of another finishing heat treatment apparatus according to the present invention. (a)、(b)は、図３に記載の装置に用いるローラーの正面図である。(a), (b) is a front view of the roller used for the apparatus of FIG. 本発明における擦切り板の移動方向を説明する図である。It is a figure explaining the moving direction of the scraping board in this invention.

以下、本発明を図面に基づき具体的に説明する。
本発明は、従来よりも生産量が多い場合であっても、効果的に脱炭、脱酸および脱窒された製品粉を得ることができる装置と、その装置を用いた鉄粉の仕上熱処理方法であるが、本発明において対象となる鉄粉とは、炭素、酸素、窒素などの不純物が目標とする値より高い粗製粉であって、具体的には、例えば、炭素：0.50mass％、酸素：1.00mass％である。 Hereinafter, the present invention will be specifically described with reference to the drawings.
The present invention provides an apparatus capable of effectively obtaining product powder that has been decarburized, deoxidized and denitrified even when the production amount is higher than that of the conventional one, and finish heat treatment of iron powder using the apparatus Although it is a method, the iron powder which is the object in the present invention is a coarse powder in which impurities such as carbon, oxygen and nitrogen are higher than a target value, specifically, for example, carbon: 0.50 mass%, Oxygen: 1.00 mass%.

図１は、本発明に従う連続式ベルト炉であり、移動床１の進行方向から順に、鉄粉装入部（12，13）、脱炭室７、脱酸室８、脱窒室９を備え、さらに、図２(a)、(b)に示した凹凸を有する擦切り板３と、駆動装置（図示せず）とを設けたものである。上記した凹凸を有する擦切り板は、上記鉄粉装入部に設けられている。   FIG. 1 is a continuous belt furnace according to the present invention, and includes an iron powder charging section (12, 13), a decarburization chamber 7, a deoxidation chamber 8, and a denitrification chamber 9 in order from the moving direction of the moving bed 1. Further, the scraping plate 3 having the unevenness shown in FIGS. 2A and 2B and a driving device (not shown) are provided. The scraping plate having the above irregularities is provided in the iron powder charging portion.

図３は、本発明に従う連続式ベルト炉の別形態であり、移動床１の進行方向から順に、鉄粉装入部（12，13）、脱炭室７、脱酸室８、脱窒室９を備えるところまでは上記図１の装置と同じであるが、さらに、図４(a)、(b)に示したような凹凸を有するローラー４を設けている。ここで、上記ローラーは回転するための回転軸が設けられている。   FIG. 3 shows another embodiment of the continuous belt furnace according to the present invention. In order from the moving direction of the moving bed 1, the iron powder charging section (12, 13), the decarburization chamber 7, the deoxidation chamber 8, the denitrification chamber. 9 is the same as the apparatus shown in FIG. 1, but a roller 4 having unevenness as shown in FIGS. 4 (a) and 4 (b) is further provided. Here, the said roller is provided with the rotating shaft for rotating.

また、ローラー４は、回転するための駆動装置（図示せず）を設けることができる。鉄粉の進行力のみで回転するよりも、効果的に鉄粉層に凹凸をつけることができ、その結果、脱炭、脱酸および脱窒反応をより効果的に行うことができるからである。   Moreover, the roller 4 can be provided with a driving device (not shown) for rotating. This is because the iron powder layer can be made uneven more effectively than rotating only with the advance of the iron powder, and as a result, decarburization, deoxidation and denitrification reactions can be performed more effectively. .

ここで、図１に示した駆動装置および擦切り板３を備えた鉄粉の熱処理装置を用いる方法としては、駆動装置を用い、擦切り板を搖動（稼働）させて、上記鉄粉からなる鉄粉層に凹凸を成形する形態が挙げられる。   Here, as a method of using the iron powder heat treatment apparatus provided with the driving device and the scraping plate 3 shown in FIG. 1, the scraping plate is moved (operated) using the driving device, and the iron powder made of the iron powder is used. The form which shape | molds an unevenness | corrugation in a layer is mentioned.

具体的には、以下の手順が好ましい。
粗製粉12を、原料ホッパー13を介し、移動床１に供給して、図１に示したように、移動床１上で鉄粉からなる鉄粉層とし、凹凸を有する擦切り板３により凹凸状の形状が付与されて装入される。この鉄粉層を、移動床が巻きつけられたホイール14の動きによって連続的に送り、脱炭室７、脱酸室８、脱窒室９を経て、ケーキ状塊（粉砕すると粉末冶金用鉄粉）を出口側シールロール15から排出する。 Specifically, the following procedure is preferable.
The coarse powder 12 is supplied to the moving bed 1 through the raw material hopper 13 to form an iron powder layer made of iron powder on the moving bed 1 as shown in FIG. The shape is given and charged. This iron powder layer is continuously fed by the movement of the wheel 14 around which the moving floor is wound, and passes through the decarburization chamber 7, the deoxidation chamber 8, and the denitrification chamber 9, and then cake-like lump (when pulverized, iron for powder metallurgy) Powder) is discharged from the outlet side seal roll 15.

一方、雰囲気ガスは、ガス導入口５から導入し、排ガスはガス出口６から排出する。なお、粗製粉の加熱は、燃焼用ガスをラジアントチューブ16内で燃焼して行うのが好ましい。   On the other hand, the atmospheric gas is introduced from the gas inlet 5 and the exhaust gas is discharged from the gas outlet 6. The heating of the coarse powder is preferably performed by burning the combustion gas in the radiant tube 16.

本発明に用いる粗製粉（鉄粉）としては、ミルスケール粗還元粉（炭素量：0.30〜0.60mass％、酸素量：0.80〜1.00mass％）を使用するのが好ましい。そして、熱処理パターンとしては、脱炭ゾーンで900℃程度まで昇温し、脱酸ゾーンでほぼ900℃に保持し、脱窒ゾーンで300℃以下程度に下げ、その後は、炉外で自然冷却とするといった、従来公知の熱処理パターンが適用できる。   As the coarse powder (iron powder) used in the present invention, it is preferable to use mill scale rough reduced powder (carbon content: 0.30 to 0.60 mass%, oxygen content: 0.80 to 1.00 mass%). And as a heat treatment pattern, the temperature is raised to about 900 ° C. in the decarburization zone, maintained at about 900 ° C. in the deoxidation zone, lowered to about 300 ° C. or less in the denitrification zone, and then naturally cooled outside the furnace. A conventionally known heat treatment pattern can be applied.

さらに、図１に示したように、ガスを単純な加湿器10により露点50℃程度に加湿して、50Nm3/ｈ程度の流量で、ガス導入口から炉内の昇温ゾーン（脱炭ゾーン）に導入し、同時に、乾燥したガスを100Nm3/ｈ程度の流量で、灼熱ゾーン（脱酸ゾーン）と冷却ゾーン（脱窒ゾーン）に導入して、粗製粉を仕上熱処理することが好ましい。 Furthermore, as shown in FIG. 1, the gas is humidified to a dew point of about 50 ° C. with a simple humidifier 10, and the temperature rise zone (decarburization zone) from the gas inlet to the furnace at a flow rate of about 50 Nm 3 / h. At the same time, the dried gas is preferably introduced into the ignition zone (deoxidation zone) and the cooling zone (denitrification zone) at a flow rate of about 100 Nm 3 / h to finish-heat the coarse powder.

本発明では、上記擦切り板の揺動を、上下方向、左右方向および上下左右方向のうちから選んだ少なくとも一つの方向に行うことが望ましい。
ここで、上下方向とは、図５に示したように、鉄粉の進行方向に対し高低方向である。一方、左右方向とは、図５に示したように、鉄粉の進行方向に対し水平かつ直角な方向（鉄粉層の幅方向）である。なお、上下左右とは、上記上下方向と左右方向の動きを適宜組合せることである。そして、本発明では、擦切り板が駆動装置によって、揺動するのであるが、この揺動は、上下、左右および上下左右方向のうちから選んだ少なくとも一つの方向に動く反復動作であることが好ましい。 In the present invention, it is desirable to swing the scraping plate in at least one direction selected from the vertical direction, the horizontal direction, and the vertical and horizontal directions.
Here, as shown in FIG. 5, the vertical direction is a height direction with respect to the traveling direction of the iron powder. On the other hand, as shown in FIG. 5, the left-right direction is a direction that is horizontal and perpendicular to the traveling direction of the iron powder (the width direction of the iron powder layer). Note that “up / down / left / right” means appropriately combining the movements in the up / down direction and the left / right direction. In the present invention, the scraping plate is swung by the driving device, and this swinging is preferably a repetitive movement that moves in at least one direction selected from up and down, left and right, and up and down, left and right directions. .

本発明に従うもう一つの実施形態としては、図３に示したように、回転するローラー４を備えた熱処理装置を用いるものである。
具体的には、上記熱処理装置に鉄粉を装入するに際し、上記ローラーが自転するように装入鉄粉に該ローラーを押し付けるものである。 As another embodiment according to the present invention, as shown in FIG. 3, a heat treatment apparatus having a rotating roller 4 is used.
Specifically, when iron powder is charged into the heat treatment apparatus, the roller is pressed against the charged iron powder so that the roller rotates.

さらに、上記ローラーを備えた鉄粉の熱処理装置に設けられた駆動装置を用いて、上記ローラーを回転させつつ、上記熱処理装置に鉄粉を装入する形態としてもよい。
鉄粉の進行力のみで回転するよりも、効果的に鉄粉層に凹凸をつけることができ、その結果、脱炭、脱酸および脱窒反応をより効果的に行うことができるからである。 Furthermore, it is good also as a form which inserts iron powder in the said heat processing apparatus, rotating the said roller using the drive device provided in the heat processing apparatus of the iron powder provided with the said roller.
This is because the iron powder layer can be made uneven more effectively than rotating only with the advance of the iron powder, and as a result, decarburization, deoxidation and denitrification reactions can be performed more effectively. .

また、前記回転を、前記熱処理装置における鉄粉の搬送速度に同期した回転とすれば、さらに効果的に鉄粉層に凹凸をつけることができ、その結果、脱炭、脱酸および脱窒反応をより効果的に行うことができるので好ましい。   Further, if the rotation is a rotation synchronized with the transfer speed of the iron powder in the heat treatment apparatus, the iron powder layer can be more effectively uneven, and as a result, decarburization, deoxidation and denitrification reactions. Can be performed more effectively.

加えて、前記駆動装置に対し、前記ローラーを、回転させつつ、さらに上下、水平および左右のうちから選んだ少なくとも一つの動作で揺動させる機能を付加する。この機能により、さらに効果的に鉄粉層に凹凸をつけることができ、その結果、脱炭、脱酸および脱窒反応をより効果的に行うことができるからである。   In addition, a function of rotating the roller by at least one operation selected from up, down, horizontal, and left and right while rotating is added to the drive device. This function is because the iron powder layer can be more effectively made uneven by this function, and as a result, decarburization, deoxidation, and denitrification reactions can be performed more effectively.

本発明において、上記に示した以外の鉄粉の仕上熱処理装置の装置構成、および鉄粉の仕上熱処理に係る処理条件は、従来公知の装置構成および条件に従うことができる。   In the present invention, the apparatus configuration of the iron powder finishing heat treatment apparatus other than those described above and the processing conditions relating to the iron powder finishing heat treatment can conform to conventionally known apparatus configurations and conditions.

本実施例は、図１または３に示した装置を用い、表１に示した条件で試験を実施した。なお、比較例として、駆動装置の動きを止めたもの、さらに、平坦形状の擦切り板を用いたものを併せて実施した。
ここで、擦切り板は、図２(a)を使用した。ローラーは、図４(a)を使用し、回転の周速は、搬送速度に同期させた。
上下動は、単位秒当たり５ｍｍの速度でストロークを10ｍｍとした。また、左右動は、単位秒当たり５ｍｍの速度でストロークを10ｍｍとした。さらに、上下左右動は、上記上下動と左右動とを同時に行う動きとした。 In this example, the test shown in Table 1 was performed using the apparatus shown in FIG. In addition, as a comparative example, what stopped the motion of the drive device, and what used the flat-shaped scraping board were implemented together.
Here, FIG. 2 (a) was used as the scraping plate. As the roller, FIG. 4 (a) was used, and the peripheral speed of rotation was synchronized with the conveyance speed.
In the vertical movement, the stroke was 10 mm at a speed of 5 mm per second. Further, the left-right movement was performed at a speed of 5 mm per second and a stroke of 10 mm. Further, the up / down / left / right movement is a movement in which the up / down movement and the left / right movement are performed simultaneously.

かくして得られた製品粉を、赤外線吸収法にて炭素量および酸素量を測定した。測定結果を表１に併記する。   The product powder thus obtained was measured for carbon content and oxygen content by an infrared absorption method. The measurement results are also shown in Table 1.

Figure 2014214327
Figure 2014214327

同表より、本実施例中、本発明に従う発明例は、単位時間当たりの生産量が5.0tに増えても、単位時間当たりの生産量が3.0〜4.5ｔである比較例と同等に、炭素量：0.005mass％以下、酸素量：0.150mass％以下という純度を満足していることが分かる。
加えて、比較例の稼働条件で、単位時間当たりの生産量のみ変更し、単位時間当たりの生産量を5.0t以上にしたところ、炭素量：0.005mass％以下、酸素量：0.150mass％以下という純度を満足できなかった。 From the table, in the present example, the inventive example according to the present invention is similar to the comparative example in which the production amount per unit time is 3.0 to 4.5 t, even if the production amount per unit time is increased to 5.0 t. It turns out that the purity of the quantity: 0.005 mass% or less and the oxygen content: 0.150 mass% or less is satisfied.
In addition, under the operating conditions of the comparative example, only the production amount per unit time was changed, and the production amount per unit time was set to 5.0 t or more, so that the carbon amount was 0.005 mass% or less and the oxygen amount was 0.150 mass% or less. The purity could not be satisfied.

１ ベルト
２ 粗製鉄鋼粉層
３ 擦切り板
４ ローラー
５ ガス導入口
６ ガス出口
７ 脱炭室
８ 脱酸室
９ 脱窒室
10 加湿器
11 水蒸気
12 粗製鉄鋼粉
13 ホッパー
14 ホイール
15 シールロール
16 ラジアントチューブ
17 仕切り壁 DESCRIPTION OF SYMBOLS 1 Belt 2 Coarse steel powder layer 3 Scraping plate 4 Roller 5 Gas inlet 6 Gas outlet 7 Decarburization chamber 8 Deoxidation chamber 9 Denitrification chamber
10 Humidifier
11 Water vapor
12 Crude steel powder
13 Hopper
14 wheel
15 Seal roll
16 Radiant tube
17 Partition wall

Claims (5)

移動床の進行方向から順に、鉄粉装入部、脱炭室、脱酸室、脱窒室を備える鉄粉の仕上熱処理装置において、
該鉄粉装入部に、凹凸を有する擦切り板を設け、さらに該擦切り板に駆動装置を設けた鉄粉の仕上熱処理装置。 In order from the moving direction of the moving bed, in the iron powder finishing heat treatment apparatus comprising an iron powder charging section, a decarburization chamber, a deoxidation chamber, a denitrification chamber,
A finishing heat treatment apparatus for iron powder in which a scraping plate having irregularities is provided in the iron powder charging portion, and a driving device is provided on the scraping plate. 移動床の進行方向から順に、鉄粉装入部、脱炭室、脱酸室、脱窒室を備える鉄粉の仕上熱処理装置において、
該鉄粉装入部に、凹凸を有し、かつ回転するローラーを設け、さらに該ローラーの駆動装置を設けた鉄粉の仕上熱処理装置。 In order from the moving direction of the moving bed, in the iron powder finishing heat treatment apparatus comprising an iron powder charging section, a decarburization chamber, a deoxidation chamber, a denitrification chamber,
A finishing heat treatment apparatus for iron powder, wherein the iron powder charging section is provided with a roller having irregularities and rotating, and further provided with a driving device for the roller. 請求項１に記載の駆動装置および擦切り板を備えた鉄粉の仕上熱処理装置を用いる鉄粉の仕上熱処理方法であって、上記仕上熱処理装置に鉄粉を装入するに際し、上記駆動装置を用いて、上記擦切り板を搖動させ、上記鉄粉からなる鉄粉層に凹凸を成形する鉄粉の仕上熱処理方法。   A method of finishing heat treatment of iron powder using the iron powder finishing heat treatment apparatus provided with the driving device and scraping plate according to claim 1, wherein the driving device is used when charging the iron powder into the finishing heat treatment apparatus. A finishing heat treatment method for iron powder, wherein the scraping plate is rocked to form irregularities in the iron powder layer made of the iron powder. 前記駆動装置を用いて、擦切り板を、上下方向、左右方向および上下左右方向のうちから選んだ少なくとも一つの方向に揺動させる請求項３に記載の鉄粉の仕上熱処理方法。   The iron powder finish heat treatment method according to claim 3, wherein the scraping plate is swung in at least one direction selected from the vertical direction, the horizontal direction, and the vertical and horizontal directions using the driving device. 請求項２に記載の駆動装置およびローラーを備えた鉄粉の仕上熱処理装置を用いる鉄粉の仕上熱処理方法であって、上記仕上熱処理装置に鉄粉を装入するに際し、上記駆動装置によって、上記ローラーを、回転させ、さらに上下方向、左右方向および上下左右方向のうちから選んだ少なくとも一つの方向に揺動させる鉄粉の仕上熱処理方法。   A finish heat treatment method for iron powder using the iron powder finish heat treatment apparatus provided with the drive device and roller according to claim 2, wherein when the iron powder is charged into the finish heat treatment apparatus, the drive device A method of finishing heat treatment of iron powder in which a roller is rotated and further swung in at least one direction selected from the vertical direction, the horizontal direction, and the vertical and horizontal directions.
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190033874A (en) * 2017-09-22 2019-04-01 주식회사 포스코 Reduction Device and Method
KR101988755B1 (en) * 2017-12-19 2019-06-12 주식회사 포스코 Belt furnace

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190033874A (en) * 2017-09-22 2019-04-01 주식회사 포스코 Reduction Device and Method
KR101968000B1 (en) * 2017-09-22 2019-04-10 주식회사 포스코 Reduction Device and Method
KR101988755B1 (en) * 2017-12-19 2019-06-12 주식회사 포스코 Belt furnace

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