JPS6021759Y2 - Continuous powder reduction furnace - Google Patents
Continuous powder reduction furnaceInfo
- Publication number
- JPS6021759Y2 JPS6021759Y2 JP1343779U JP1343779U JPS6021759Y2 JP S6021759 Y2 JPS6021759 Y2 JP S6021759Y2 JP 1343779 U JP1343779 U JP 1343779U JP 1343779 U JP1343779 U JP 1343779U JP S6021759 Y2 JPS6021759 Y2 JP S6021759Y2
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- JP
- Japan
- Prior art keywords
- gas
- furnace
- powder
- section
- cooling
- 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
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Description
【考案の詳細な説明】
本考案は還元炉とりわけ金属粉末の連続還元炉に関する
。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a reduction furnace, particularly a continuous reduction furnace for metal powder.
金属粉末の製造法は種々あるが、いずれの場合にも表面
活性度が高く、多少の酸化皮膜をもっており、これをそ
のまま原料粉として用いた場合には焼結製品の品質に悪
影響があられれる。There are various methods for producing metal powder, but in all cases, the surface activity is high and there is some oxide film, so if this powder is used as it is as a raw material powder, the quality of the sintered product will be adversely affected.
このようなことから金属粉末の還元炉が用いられ、その
うち連続還元炉として第１図のようなタイプのものが知
られている。For this reason, metal powder reduction furnaces are used, and among these, the type shown in FIG. 1 is known as a continuous reduction furnace.
すなわち、この粉末還元炉は、発熱体３を設けた加熱炉
１の前後に前筒３０と後筒３１を連設し、それら前筒３
０と後筒３１および加熱炉炉芯管４と外部の間にフープ
ベルト１１を懸回し、前筒３０と入口フレームカーテン
部３２の間に粉末供給器６を設け、該粉末供給器６から
粉末をフープベルト１１に載せ、これを加熱炉内に移送
する一方、後筒３１と加熱炉１の間に設けたガス供給管
３３から水素ガスやアンモニア分解ガスなどの還元性ガ
スを導入し、これをフープベルト１１上の粉末と接触さ
れることで還元反応を得しめ、還元後の粉末を、後筒３
１に設けたバイパス型多管冷却部３４とファン３５によ
る空冷手段で冷却し、出口フレームカーテン３６から出
たところでクラッシャー３７により破砕する構造となっ
ていたものである。That is, this powder reduction furnace has a front cylinder 30 and a rear cylinder 31 installed in series before and after a heating furnace 1 provided with a heating element 3.
A hoop belt 11 is suspended between 0 and the rear cylinder 31 and the heating furnace core tube 4 and the outside, and a powder feeder 6 is provided between the front cylinder 30 and the inlet frame curtain part 32, and powder is supplied from the powder feeder 6. is placed on the hoop belt 11 and transferred into the heating furnace, while a reducing gas such as hydrogen gas or ammonia decomposition gas is introduced from the gas supply pipe 33 provided between the rear cylinder 31 and the heating furnace 1. is brought into contact with the powder on the hoop belt 11 to cause a reduction reaction, and the reduced powder is transferred to the rear cylinder 3.
The structure was such that it was cooled by an air cooling means using a bypass type multi-tube cooling section 34 and a fan 35 provided in 1, and was crushed by a crusher 37 when it came out of an exit frame curtain 36.
しかし、このような構造では、第２図のフローから明ら
かなように、還元用の水素ガスを単純に加熱炉１と後筒
３１の間から導入し、炉体入口に近い炉芯管と通じた排
気管３８から排出して燃焼させるだけであったので、反
応後の水分を多く含む汚損ガスが炉芯管４の中に長く滞
留し、粉末還元上枢要な雰囲気純度を高く保てない（高
露点となる）という欠点があり、また、供給ガスをすべ
て燃焼させることと、前筒２カ所筒１カ所に補助ガス導
入部３９ａ、３９ｂ、３９ｃの夫々外気侵入防止用の還
元性ガスの供給する必要があることなどから、高純度の
還元性ガスをきわめて多量に供給しなければならず、処
理コストが高くなるという欠点があった。However, in such a structure, as is clear from the flow shown in Fig. 2, the hydrogen gas for reduction is simply introduced from between the heating furnace 1 and the rear cylinder 31, and is communicated with the furnace core tube near the furnace entrance. Since the gas was only discharged from the exhaust pipe 38 and combusted, the contaminated gas containing a large amount of water after the reaction remained in the furnace core tube 4 for a long time, making it impossible to maintain high atmospheric purity, which is important for powder reduction. In addition, all of the supplied gas must be combusted, and reducing gas is supplied to each of the auxiliary gas introduction sections 39a, 39b, and 39c to prevent outside air from entering into two front cylinders and one cylinder. Because of the need to process gases, an extremely large amount of high-purity reducing gas must be supplied, which has the disadvantage of increasing processing costs.
さらに、上記のように多量の還元性ガスを供給しても容
易に露点の低下を回り得ないため、還元速度が遅いもの
となって優れた品質の還元粉を生産できないという問題
があり、これら各点から、鉄粉などはとも角としても、
クローム、マンガン、モリブデン、タングステン、バナ
ジウムなどの特殊粉末やこれらと鋼の合金粉など還元性
の悪い金属粉を工業的に低コストで処理できないという
不具合が生じていたものである。Furthermore, even if a large amount of reducing gas is supplied as described above, the dew point cannot be easily lowered, so the reduction rate is slow and it is not possible to produce reduced powder of excellent quality. From each point, whether iron powder or the like is square,
There was a problem in that metal powders with poor reducibility, such as special powders such as chromium, manganese, molybdenum, tungsten, and vanadium, and alloy powders of these and steel, could not be processed industrially at low cost.
本考案は、前記のような従来の粉末還元炉の不具合を解
消し、少ない還元性ガス使用量でしかも炉内雰囲気を高
純度に保たせ、クロームやマンガンなどの金属粉を低コ
ストで能率よく、還元処理し、良好な品質のそれら還元
粉を得ることができる連続粉末還元炉を提供せんとする
ものである。This invention solves the problems of conventional powder reduction furnaces as described above, uses less reducing gas, maintains a high purity atmosphere in the furnace, and efficiently processes metal powders such as chromium and manganese at low cost. The object of the present invention is to provide a continuous powder reduction furnace capable of performing reduction treatment and obtaining reduced powder of good quality.
この目的のため、本考案は、直列に連なる加燃炉と冷却
筒にコンベアベルトを通し、加燃炉の前で粉末を供給し
、これを移送させつつ加燃炉内に水素ガスなどの還元性
ガスを供給し、粉末に還元反応を与えるようにした連続
加燃炉において、とくに、粉末供給器と加燃炉のあいだ
に炉内ガスの取出し部を設けると共に冷却筒に再生ガス
挿入部を設け、それらガス取出し部と再生ガス挿入部を
外部配管で結ぶことにより、前記ガス取出し部から再生
ガス挿入部までの移動路と外部配管とでエンドレスの循
環系を構成させ、かつこの循環系にポンプを介在させ、
これで前記移送路に粉末移送方向と向流する還元性雰囲
気流を生起させて炉内反応ガスを強制排出し、さらに循
環系にガス冷却器と乾燥器を介在させることにより炉内
反応ガスの純度を再生させ、これを再び移動路に送給さ
せる過程を繰返すようにしたものである。For this purpose, the present invention passes a conveyor belt through the combustion furnace and cooling cylinder connected in series, supplies powder in front of the combustion furnace, and while transferring it, reduces hydrogen gas etc. into the combustion furnace. In a continuous combustion furnace in which a reactive gas is supplied to cause a reduction reaction to the powder, in particular, a furnace gas take-out part is provided between the powder feeder and the combustion furnace, and a regeneration gas insertion part is provided in the cooling cylinder. By connecting the gas extraction section and the regeneration gas insertion section with external piping, an endless circulation system is constructed by the passage from the gas extraction section to the regeneration gas insertion section and the external piping. Interpose a pump,
This creates a reducing atmosphere flow countercurrent to the powder transfer direction in the transfer path to forcibly discharge the reactant gas in the furnace, and furthermore, by interposing a gas cooler and a dryer in the circulation system, the reactant gas in the furnace is The process of regenerating the purity and sending it to the travel path again is repeated.
以下本考案の実施例を添付図面に基いて説明する。Embodiments of the present invention will be described below with reference to the accompanying drawings.
第３図ないし第６図は本考案による粉末連続還元炉を示
すもので、１は加熱炉で、耐火物２の内側に発燃体３を
装備させ、発燃体３の内側長手方向に炉芯管４を貫設さ
せている。Figures 3 to 6 show a continuous powder reduction furnace according to the present invention, in which 1 is a heating furnace, a combustion body 3 is installed inside a refractory 2, and the inside longitudinal direction of the combustion body 3 is connected to the furnace. A core pipe 4 is provided through it.
５は前記加熱炉１の前側において炉芯管４と直例に接続
された水平状の前筒部であり、この前筒部５には処理す
べき金属粉末の供給器６が設けられている。Reference numeral 5 denotes a horizontal front cylinder part directly connected to the furnace core tube 4 on the front side of the heating furnace 1, and this front cylinder part 5 is provided with a feeder 6 for the metal powder to be treated. .
前記供給器６はホッパーとフィーダの如きから構成され
ている。The feeder 6 is composed of a hopper and a feeder.
７は前記前筒部５に連設した下傾状の入口部で、その断
面は後述するコンベアベルトが通過し得る限度で小断面
となっている。Reference numeral 7 denotes a downwardly inclined inlet portion connected to the front cylinder portion 5, and its cross section is as small as a conveyor belt, which will be described later, can pass through.
８は加熱炉１の後側において炉芯管４と直列に接続され
た筒状の冷却部であり、外周に水冷箱１０が囲繞形成さ
れている。Reference numeral 8 denotes a cylindrical cooling section connected in series with the furnace core tube 4 on the rear side of the heating furnace 1, and a water cooling box 10 is formed around the outer periphery.
９は前記冷却部８の後側に連設した下傾斜の出口部であ
る。Reference numeral 9 denotes a downwardly inclined outlet section connected to the rear side of the cooling section 8.
１１は耐熱コンベアベルト（フープベルト）で、前記し
た入口部７、前筒部５、炉芯管４、冷却部８および出口
部９を順に通り、それらの外側のプーリ１２，１２’に
懸回され駆動モータ１３で連続駆動されるようになって
いる。Reference numeral 11 denotes a heat-resistant conveyor belt (hoop belt), which passes in order through the inlet section 7, front tube section 5, furnace core tube 4, cooling section 8, and outlet section 9, and is suspended around pulleys 12, 12' on the outside thereof. and is continuously driven by a drive motor 13.
しかして、本考案は前記加熱炉１と冷却部８のあいだに
還元性ガスの主導入部１４を設けると共に、加熱炉１と
粉末供給器６のあいだの前筒部５にガス取出し部１５を
設け、また前記冷却部８の適所好ましくはべきるだけ後
位置には再生ガス挿入部１６を設け、前記ガス取出し部
１５と再生ガス挿入部１６とを外部配管１７により接続
し、これによりガス取出し部１５から再生ガス挿入部１
６にいたる閉鎖断面の移動路（前筒部−炉芯管一冷却部
）と外部配管１７とでエンドレスの循環系を構成させ、
そして前記外部配管１７には、移動路中の雰囲気ガスを
ガス取出し部１５を介して吸引し再生ガス挿入部１６か
ら押込むための循環用ポンプ１Ｂと、吸引された雰囲気
ガスを強制冷却するガス冷却器１９、およびこのガス冷
却器１９から排出されたガス中の水分（不純物を含む）
を除去し露点を回復させるための乾燥器２０とを介在接
続している。Therefore, the present invention provides a main introduction part 14 for the reducing gas between the heating furnace 1 and the cooling part 8, and a gas extraction part 15 in the front cylinder part 5 between the heating furnace 1 and the powder feeder 6. Furthermore, a regeneration gas insertion section 16 is provided at an appropriate position, preferably as far back as possible, of the cooling section 8, and the gas extraction section 15 and the regeneration gas insertion section 16 are connected by an external piping 17, thereby allowing the gas to be taken out. From section 15 to regeneration gas insertion section 1
An endless circulation system is configured by the closed cross-section moving path (front cylinder part - furnace core tube - cooling part) reaching 6 and the external piping 17,
The external piping 17 includes a circulation pump 1B for sucking the atmospheric gas in the movement path through the gas extraction section 15 and pushing it in from the regeneration gas insertion section 16, and a gas cooler for forcibly cooling the sucked atmospheric gas. 19, and moisture in the gas discharged from this gas cooler 19 (including impurities)
It is connected to a dryer 20 for removing the dew point and restoring the dew point.
乾燥器２０内の充填物としては、モリキラシーブ、ゼオ
ラム、活性アルミナ等を用いることができ、図示のよう
に乾燥器２０を複系列とすれば劣化再生中も連続運転が
可能である。As the filling material in the dryer 20, molycira sieve, zeolum, activated alumina, etc. can be used, and if the dryer 20 is configured as a double series as shown in the figure, continuous operation is possible even during deterioration regeneration.
なお、必要に応じガス冷却器１９と乾燥器２０のあいだ
に冷凍器２１を介在してもよい。Note that a refrigerator 21 may be interposed between the gas cooler 19 and the dryer 20 if necessary.
また、場合によっては、主導入部１４をガス導入部１６
の系に接続し、主導入部１４を廃してもよい。In some cases, the main introduction section 14 may be replaced by the gas introduction section 16.
system, and the main introduction section 14 may be eliminated.
また本考案は、前記冷却部８と出口部９の境界付近には
、第６図に示すように、軸端部をオイルレスメタルなど
の潤滑材２３を介して軸受２４で支承させた還元粉破砕
用のコロ２２を配設している。Further, in the present invention, near the boundary between the cooling part 8 and the outlet part 9, as shown in FIG. A crushing roller 22 is provided.
この構造に加えあるいはこれに代え出口部９の外にクラ
ッシャー（図示せず）を設けてもよい。In addition to or in place of this structure, a crusher (not shown) may be provided outside the outlet section 9.
その他図面において、２５は入口部側に設けた外気侵入
防止用の補助ガス導入部、２６は防曝箱、２７はシール
材、２８は冷却箱１０の冷却水導入管、２９は同じく冷
却水排出管である。In other drawings, 25 is an auxiliary gas introduction part provided on the inlet side to prevent outside air from entering, 26 is an explosion-proof box, 27 is a sealing material, 28 is a cooling water inlet pipe of the cooling box 10, and 29 is a cooling water discharge It's a tube.
次に、第７図は本考案の他の実施例を示すもので、加熱
炉１の長さ方向中間部の炉芯管４に炉外へ到る第２のガ
ス取出し部１５′を設け、この第２のガス取出し部１５
′をガス冷却器１９より手前の外部配管１７に接続し、
これにより加熱炉中間位置と前筒部において夫々劣化還
元性雰囲気を排出させるようにし、また、ポンプ１８の
吐出側の外部配管を分岐して補助ガス導入部２５に接続
し、再生ガスで外部侵入防止を図るようにしたものであ
る。Next, FIG. 7 shows another embodiment of the present invention, in which a second gas extraction part 15' extending to the outside of the furnace is provided in the furnace core tube 4 at the middle part in the longitudinal direction of the heating furnace 1. This second gas extraction section 15
' to the external piping 17 before the gas cooler 19,
As a result, the deteriorating and reducing atmosphere is discharged from the intermediate position of the heating furnace and the front cylinder part, and the external piping on the discharge side of the pump 18 is branched and connected to the auxiliary gas introduction part 25, so that the regenerating gas enters the outside. This was designed to prevent this.
４１は第２のガス取出し部１５′の近傍に設けた加速用
の垂れである。Reference numeral 41 denotes an accelerating sag provided near the second gas extraction portion 15'.
本考案による還元炉は上記のような構成からなるので、
操業にあたっては、駆動モータ１３と循環用ポンプ１８
を稼動させ、主導入部１４と補助ガス導入部２５からそ
れぞれ水素ガスを、また粉末供給器６からは所定の金属
粉末Ａ供給する。Since the reduction furnace according to the present invention has the above-mentioned configuration,
During operation, the drive motor 13 and circulation pump 18 are
is operated, and hydrogen gas is supplied from the main introduction section 14 and the auxiliary gas introduction section 25, respectively, and a predetermined metal powder A is supplied from the powder supply device 6.
こうすれば、金属粉末Ａは前筒部５を通過するコンベア
ベルト１１に散布され、次いでコンベアベルト１１の進
行と共に炉芯管内を移送されつつ発熱体４により加熱さ
れその間主導入部１４からは還元性ガスが供給され、こ
の還元性ガスと金属粉末Ａとが接触して還元反応を起す
が、本考案においては、炉芯管４から冷却部８の間の移
動路と外部配管１７との間で循環系が構成され、この系
に循環用ポンプ１８が介在されている。In this way, the metal powder A is scattered on the conveyor belt 11 passing through the front cylinder part 5, and then heated by the heating element 4 while being transferred in the furnace core tube as the conveyor belt 11 advances, while being reduced from the main introduction part 14. A reducing gas is supplied, and this reducing gas contacts the metal powder A to cause a reduction reaction. A circulation system is constructed, and a circulation pump 18 is interposed in this system.
そのため、移動路には第６図で示す如く金属粉末Ａの移
動方向と向流する気流が形成され、炉芯管４に入り金属
粉末Ａと接触反応した還元性ガスは炉芯管中でよどむこ
となく直ちにガス取出し部１５から吸引排出される。Therefore, as shown in FIG. 6, an air current is formed in the movement path that flows countercurrently to the moving direction of the metal powder A, and the reducing gas that enters the furnace core tube 4 and reacts with the metal powder A stagnates in the furnace core tube. The gas is immediately suctioned and discharged from the gas extraction section 15 without any damage.
このようにして吸引排出された雰囲気ガスは外部配管１
７に入り、まずガス冷却器１９において水との熱交換で
急冷されることにより水分が抽出され、続いて乾燥器２
０に押込まれることにより水分が吸着され、これにより
純度の回復が与えられ、露点の低下した状態となって再
生ガス挿入部１６から再び移動路へと送り込まれ、こう
した強制循環とと純度回復が運転中繰返される。The atmospheric gas sucked and discharged in this way is transferred to the external piping 1.
7, the water is first extracted by rapid cooling through heat exchange with water in the gas cooler 19, and then in the dryer 2.
0, moisture is adsorbed, thereby restoring the purity, and the dew point is lowered, and the regeneration gas is sent from the regeneration gas insertion part 16 to the transfer path again, and this forced circulation and purity recovery are achieved. is repeated while driving.
従って、炉芯管４にはたえず水分が拡散されるよりも早
い速度で過剰水素ガスが流れることになり、それだけ還
元速度を早めることができ、また炉内雰囲気ガスの純度
が高く、露点をたとえば一５０６Ｃ以上にもすることが
できるので、低い加熱温度で還元反応を起させるこ゛と
ができるものである。Therefore, excess hydrogen gas flows through the furnace core tube 4 at a faster rate than the constant diffusion of moisture, making it possible to increase the reduction rate accordingly.Furthermore, the purity of the furnace atmosphere gas is high, and the dew point can be lowered, for example. Since the temperature can be raised to 1506C or higher, the reduction reaction can be caused at a low heating temperature.
このようにして、還元された金属粉末Ａは炉芯管４から
冷却部８へ移送され、水冷箱１０を通る冷却水により冷
却を受けるが、このとき本考案では、冷却部８内に金属
粉末Ａの移送方向と向流する再生還元性ガス流が生じて
いる。In this way, the reduced metal powder A is transferred from the furnace core tube 4 to the cooling section 8 and is cooled by the cooling water passing through the water cooling box 10. At this time, in the present invention, the metal powder is A regenerative reducible gas flow countercurrent to the direction of transport of A is created.
そのため金属粉末Ａは効果的に強制冷却され、一方、再
生還元性ガスは受熱により昇温し炉芯管４内に温度差が
少ない条件下で送り込まれることになる。Therefore, the metal powder A is effectively forcedly cooled, while the regenerated reducing gas is heated by receiving heat and is fed into the furnace core tube 4 under conditions where there is little temperature difference.
そして、金属粉末Ａは還元・冷却の間に層状のまま固形
化するが、冷却部８の終端に連設した出口部９が下方へ
傾斜しており、それに伴ってコンベアベルト１１も水平
状から下方へ傾斜状に走行する。The metal powder A is solidified in a layered state during reduction and cooling, but the outlet section 9 connected to the end of the cooling section 8 is inclined downward, and the conveyor belt 11 also changes from horizontal to parallel. Travels downward in an inclined manner.
そしてこの傾斜始端ゾーンに破砕用コロ２２が配設され
ているので、ベルトコンベア上の固形化した金属粉末層
の厚さ方向に破砕用コロ２２が作用し、これにより再び
粉状に戻され出口部９から送り出されるものである。Since the crushing rollers 22 are disposed in this inclined starting end zone, the crushing rollers 22 act in the thickness direction of the solidified metal powder layer on the belt conveyor, and the solidified metal powder layer on the belt conveyor is returned to powder form and exits. It is sent out from section 9.
以上が本考案の基本的な作用であるが、第７図の実施例
の場合には、加熱炉中間の炉芯管４に第２のガス取出し
部１５′を設けたため、この第２のガス取出し部１５′
と第１のガス取出し部１５の間に露点の高い（水分の多
い）雰囲気ゾーンが形成され、従ってこのゾーンで効果
的な脱炭が行われることになる。The above is the basic operation of the present invention. In the case of the embodiment shown in FIG. Take-out part 15'
A high dew point (high moisture) atmospheric zone is formed between the first gas outlet 15 and the first gas outlet 15, and therefore effective decarburization takes place in this zone.
すなわち、加熱炉中で粉末に対する脱炭と還元が連続し
て行われるものであり、そのため、この実施例によれば
、カーボンが多く含まれる粉末から高純度の粉末を作る
ことができる。That is, decarburization and reduction of the powder are performed continuously in the heating furnace, and therefore, according to this embodiment, high purity powder can be made from powder containing a large amount of carbon.
なお、本考案においては、出口部９についてはガス導入
部１６からの水素ガスの一部が下降し、また入口部７に
ついては補助ガス導入部２５からの水素ガスが下降し、
しかも入口部７の始端開口はコンベアベルト１１の厚さ
分はどの小断面であればよいので、外気遮断用のガス使
用量も少なくて済み、従って、循環系における純度再生
作用とあいまち還元性ガスの使用量を、第１図の如き従
来炉にくらべ１１１０以下というように著しく節減する
ことが可能である。In the present invention, a portion of the hydrogen gas from the gas introduction section 16 descends to the outlet section 9, and a portion of the hydrogen gas from the auxiliary gas introduction section 25 descends to the inlet section 7.
Moreover, since the starting end opening of the inlet section 7 can have a small cross-section corresponding to the thickness of the conveyor belt 11, the amount of gas used to shut off the outside air can be reduced, and therefore, the purity regeneration effect in the circulation system and the reducing gas It is possible to significantly reduce the consumption amount to 1110 or less compared to the conventional furnace as shown in FIG.
以上説明した本考案によるときには、コンベア式の粉末
連続還元炉において、加熱炉１に連設した冷却部８に再
生ガス挿入部１６を設けると共に、加熱炉１とこれによ
り手前の粉末供給器６との間に炉内ガスの取出し部１５
を設け、前記ガス取出し部１５と再生ガス挿入部１６を
外部配管１７で結んで循環系を構成させ、該循環系にガ
ス冷却器１９と乾燥器２０および循環用ポンプ１８とを
介在接続させたので、水素ガスなどの還元性ガスの使用
量を大きく節減することができ、しかも同還元性ガスの
純度を高く（露点を低く）保たせることができるもので
あり、またこのことから還元速度を早め加熱温度を低下
させることが可能になるので、良好な品質の還元粉を得
ることができる。According to the present invention described above, in a conveyor-type powder continuous reduction furnace, a regeneration gas insertion part 16 is provided in the cooling part 8 connected to the heating furnace 1, and the heating furnace 1 and the powder feeder 6 at the front thereof are connected to each other. Between the furnace gas take-off part 15
The gas extraction section 15 and the regeneration gas insertion section 16 are connected by an external pipe 17 to form a circulation system, and a gas cooler 19, a dryer 20, and a circulation pump 18 are interposed and connected to the circulation system. Therefore, the amount of reducing gas used such as hydrogen gas can be greatly reduced, and the purity of the reducing gas can be kept high (low dew point). Since it becomes possible to lower the heating temperature early, reduced powder of good quality can be obtained.
従って、本考案によれば、クロームやマンガンの単体粉
あるいはこれを含む特殊鋼粉など還元性の悪い粉末を、
工業的に低コストで能率よく還元処理することができる
というすぐれた効果が得られる。Therefore, according to the present invention, powders with poor reducibility, such as elemental powders of chromium or manganese or special steel powders containing them, can be used.
An excellent effect can be obtained in that reduction treatment can be carried out industrially at low cost and efficiently.
第１図は従来の粉末還元炉を示す縦断側面図、第２図は
従来炉における雰囲気のフローを示す説明図、第３図は
本考案粉末連続還元炉の一実施例を示す縦断側面図、第
４図は第３図ＩＶ−ＩＶ線にそう断面図、第５図は第３
図■−■線にそう断面図、第６図は本考案還元炉におけ
る雰囲気のフローを示す説明図、７図は本考案粉未還元
炉の他の実施例を示す縦断側面図である。
図面において、１は加熱炉、３は発熱体、４は炉芯管、
６は粉末供給器、８は冷却部、１５はガス取出し部、１
６は再生ガス挿入部、１７は循環用配管、１８はポンプ
、１９はガス冷却器、２０は乾燥器を各示す。FIG. 1 is a vertical side view showing a conventional powder reduction furnace, FIG. 2 is an explanatory diagram showing the flow of atmosphere in the conventional furnace, and FIG. 3 is a vertical side view showing an embodiment of the continuous powder reduction furnace of the present invention. Figure 4 is a sectional view taken along the line IV-IV in Figure 3, and Figure 5 is a cross-sectional view taken along line IV-IV in Figure 3.
6 is an explanatory diagram showing the flow of atmosphere in the reducing furnace of the present invention, and FIG. 7 is a longitudinal sectional view showing another embodiment of the unreduced powder furnace of the present invention. In the drawings, 1 is a heating furnace, 3 is a heating element, 4 is a furnace core tube,
6 is a powder feeder, 8 is a cooling section, 15 is a gas extraction section, 1
Reference numeral 6 indicates a regeneration gas insertion section, 17 indicates a circulation pipe, 18 indicates a pump, 19 indicates a gas cooler, and 20 indicates a dryer.
Claims (1)
れらと外部とにコンベアベルト１１を懸回し、加熱炉１
の手前で粉末を供給し、これを移送させつつ加熱炉１内
に還元性雰囲気を供給して粉末の還元を図るようにした
連続炉において、粉末供給器６と加熱炉１の間に炉内ガ
スの取出し部１５を設けると共に、冷却部８には再生ガ
ス挿入部１６を設け、前記ガス取出し部１５と再生ガス
挿入部１６を外部配管１７で結んで循環系を構成させ、
該循環系にガス冷却器１９と乾燥器２０および循環用ポ
ンプ１８とを介在接続したことを特徴とする粉末連続還
元炉。A heating furnace 1 equipped with a heating element 3 and a cooling section 8 are connected in series, and a conveyor belt 11 is suspended between them and the outside.
In a continuous furnace in which powder is supplied before the powder is transferred and a reducing atmosphere is supplied into the heating furnace 1 to reduce the powder, there is a space inside the furnace between the powder feeder 6 and the heating furnace 1. A gas extraction part 15 is provided, and a regeneration gas insertion part 16 is provided in the cooling part 8, and the gas extraction part 15 and the regeneration gas insertion part 16 are connected with an external pipe 17 to form a circulation system,
A continuous powder reduction furnace characterized in that a gas cooler 19, a dryer 20, and a circulation pump 18 are interposed and connected to the circulation system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1343779U JPS6021759Y2 (en) | 1979-02-06 | 1979-02-06 | Continuous powder reduction furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1343779U JPS6021759Y2 (en) | 1979-02-06 | 1979-02-06 | Continuous powder reduction furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS55114492U JPS55114492U (en) | 1980-08-12 |
| JPS6021759Y2 true JPS6021759Y2 (en) | 1985-06-28 |
Family
ID=28831524
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1343779U Expired JPS6021759Y2 (en) | 1979-02-06 | 1979-02-06 | Continuous powder reduction furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6021759Y2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61110703A (en) * | 1984-11-06 | 1986-05-29 | Kawasaki Steel Corp | Method and device for finish heat treatment of iron and steel powder |
-
1979
- 1979-02-06 JP JP1343779U patent/JPS6021759Y2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS55114492U (en) | 1980-08-12 |
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