JPH01247514A - Fluidized bed pre-reduction furnace and operating method thereof - Google Patents
Fluidized bed pre-reduction furnace and operating method thereofInfo
- Publication number
- JPH01247514A JPH01247514A JP7724388A JP7724388A JPH01247514A JP H01247514 A JPH01247514 A JP H01247514A JP 7724388 A JP7724388 A JP 7724388A JP 7724388 A JP7724388 A JP 7724388A JP H01247514 A JPH01247514 A JP H01247514A
- Authority
- JP
- Japan
- Prior art keywords
- level meter
- ore
- fine ore
- raw material
- downcomer
- 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
Links
- 238000011017 operating method Methods 0.000 title 1
- 239000002994 raw material Substances 0.000 claims abstract description 31
- 238000003723 Smelting Methods 0.000 claims description 21
- 238000000034 method Methods 0.000 claims description 6
- 238000007599 discharging Methods 0.000 abstract 2
- 239000007789 gas Substances 0.000 description 17
- 239000000843 powder Substances 0.000 description 13
- 239000012159 carrier gas Substances 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000005273 aeration Methods 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0033—In fluidised bed furnaces or apparatus containing a dispersion of the material
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Dispersion Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture Of Iron (AREA)
- Crucibles And Fluidized-Bed Furnaces (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、溶融還元炉に装入される粉鉱石を予備還元す
るために使用する流動層予備還元炉及びその運転方法に
関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a fluidized bed pre-reduction furnace used to pre-reduce fine ore charged into the smelting reduction furnace and a method of operating the same.
従来の高炉による溶銑製造技術に代わるものとして、溶
融還元法が注目を浴びている。この方法で使用する溶融
還元炉は、使用する原料に制約を受けることなく、より
小規模な設備により鉄系合金の溶湯を製造することを目
的として開発されたものである。また、溶融還元炉で発
生した排ガスの還元力及び熱を有効に利用するため、流
動化ガスとして流動層炉で原料鉱石を予熱、予備還元す
る方法等も開発されている。The smelting reduction method is attracting attention as an alternative to the conventional hot metal production technology using a blast furnace. The smelting reduction furnace used in this method was developed for the purpose of producing molten iron-based alloys using smaller-scale equipment without being restricted by the raw materials used. Furthermore, in order to effectively utilize the reducing power and heat of the exhaust gas generated in the smelting reduction furnace, a method has been developed in which raw ore is preheated and pre-reduced in a fluidized bed furnace as a fluidizing gas.
また、大きな空塔速度で流動化ガスを炉内に吹き込み、
粉鉱石の予熱、予備還元等を高速で行う形式の炉外循環
式流動層炉が知られている。この場合、流動化ガスの空
塔速度が大きくなるに従って、流動層炉から外部に飛散
する粉鉱石の割合も大きくなる。そこで、飛散した粉鉱
石は、炉外循環経路に設けられたサイクロンで排ガスか
ら分離・捕捉されて、ダウンカマーから定量づつ流動層
炉を構成するライザー内に戻される。In addition, fluidizing gas is blown into the furnace at a high superficial velocity,
BACKGROUND ART An external circulation type fluidized bed furnace is known that performs preheating, preliminary reduction, etc. of fine ore at high speed. In this case, as the superficial velocity of the fluidizing gas increases, the proportion of fine ore scattered outside from the fluidized bed furnace also increases. Therefore, the scattered fine ore is separated and captured from the exhaust gas by a cyclone installed in the external circulation path, and is returned in fixed quantities from the downcomer into the riser that constitutes the fluidized bed furnace.
本発明者等は、この炉外@環式流動層炉を種々の観点か
ら研究・開発して来たものであり、その成果を特願昭6
1−71561号、特顆昭61−71568号、特願昭
61−288672号等として出願している。The present inventors have researched and developed this external @ annular fluidized bed reactor from various viewpoints, and have published the results in a patent application filed in 1983.
Applications have been filed as No. 1-71561, Special Patent Application No. 1982-71568, and Japanese Patent Application No. 1982-288672.
この外部循環式流動層炉においては、予備還元された粉
鉱石がダウンカマーから溶融還元炉に切り出される。と
ころが、溶融還元炉は間歇的な操業形態をとるものが多
く、そのため粉鉱石の切出しも間歇的にならざるを得な
い。そこで、溶融還元炉に粉鉱石を切り出しているとき
を基準として流動層炉を設計すると、切出し停止時にダ
ウンカマー内に多量の粉鉱石が堆積することになる。In this external circulation type fluidized bed furnace, pre-reduced fine ore is cut from the downcomer into the smelting reduction furnace. However, many smelting reduction furnaces operate in an intermittent manner, and as a result, the cutting of fine ore must also be done intermittently. Therefore, if a fluidized bed furnace is designed based on the time when fine ore is being cut into the smelting reduction furnace, a large amount of fine ore will accumulate in the downcomer when cutting is stopped.
この状態で粉鉱石を供給し続けると、堆積量が徐々に増
加して、ダウンカマーを溢れ出すようになる。また、流
動層炉の運転を停止すると、ダウンカマーに静止状態で
堆積した粉鉱石がスティッキングを起こし、循環経路を
閉塞する。或いは、流動層炉に対する粉鉱石原料の供給
を停止して還元ガスだけを流動層炉に吹き込むと、粉鉱
石の還元が過度に進行し、炉内或いはダウンカマーにお
いてスティッキングが発生し易くなる。If fine ore is continued to be supplied in this state, the amount of deposited ore will gradually increase and the downcomer will begin to overflow. Further, when the operation of the fluidized bed furnace is stopped, the fine ore accumulated in the downcomer in a stationary state causes sticking and blocks the circulation path. Alternatively, if the supply of the fine ore raw material to the fluidized bed furnace is stopped and only the reducing gas is blown into the fluidized bed furnace, the reduction of the fine ore will proceed excessively and sticking will likely occur in the furnace or in the downcomer.
そこで、本発明は、溶融還元炉に対する予備還元された
粉鉱石の切出し及び切出し停止に合わせて、ダウンカマ
ーに溜る粉鉱石の量を変更することによって、流動層炉
を連続運転しながら、一定した品質の予備還元鉱を得る
ことを目的とする。Therefore, the present invention aims to maintain a constant level of ore while continuously operating the fluidized bed furnace by changing the amount of fine ore accumulated in the downcomer in accordance with the cutting and stopping of the pre-reduced fine ore to the smelting reduction furnace. The purpose is to obtain quality preliminary reduced ore.
本発明の流動層予備還元炉は、その目的を達成するため
、ライデーに併設したダウンカマーに設けた高レベル計
及び低レベル計と、前記ダウンカマーから予備還元され
た粉鉱石を溶融還元炉に切り出す移送管の途中に設けた
供給装置と、前記ライザー内に粉鉱石を装入する原料供
給管の途中に設けた原料供給装置と、前記高レベル計及
び前記低レベル計と前記供給装置及び前記原料装入装置
とを電気的に接続する回線とを備えていることを特徴と
する。In order to achieve the purpose, the fluidized bed pre-reduction furnace of the present invention has a high level meter and a low level meter installed in a downcomer attached to the Raiday, and the pre-reduced ore powder from the downcomer is transferred to the smelting reduction furnace. A supply device provided in the middle of a transfer pipe for cutting, a raw material supply device provided in the middle of a raw material supply pipe for charging fine ore into the riser, the high level meter, the low level meter, the supply device, and the raw material supply device. It is characterized by comprising a line for electrically connecting the raw material charging device.
そして、予備還元された粉鉱石を溶融還元炉に装入して
いるときには、ダウンカマー内にある粉鉱石のレベルを
低レベル計で検出し、前記ダウンカマー内に少量の粉鉱
石が溜るように、粉鉱石を前記ライザーと前記ダウンカ
マーとの間で循環させる。他方、前記溶融還元炉に対す
る粉鉱石の供給を停止しているときには、前記ダウンカ
マー内にある粉鉱石のレベルを高レベル計で検出し、高
レベル状態で粉鉱石を前記ライザーと前記ダウンカマー
との間で循環させる。When the pre-reduced ore powder is being charged into the smelting reduction furnace, the level of the ore powder in the downcomer is detected with a low level meter, and a small amount of ore powder is collected in the downcomer. , circulating fine ore between the riser and the downcomer. On the other hand, when the supply of fine ore to the smelting reduction furnace is stopped, the level of fine ore in the downcomer is detected with a high level meter, and the fine ore is transferred between the riser and the downcomer at a high level. circulate between.
以下、図面を参照しながら、実施例により本発明の特徴
を具体的に説明する。Hereinafter, the features of the present invention will be specifically explained using examples with reference to the drawings.
第1図は、本発明の流動層予備還元炉を示す概略図であ
る。FIG. 1 is a schematic diagram showing a fluidized bed pre-reduction furnace of the present invention.
この流動層予備還元炉は、流動層炉本体を構成するライ
ザー1にダウンカマー2が併設されている。このライザ
ー1とダウンカマー2との間は、上部が導出管3、下部
が導入管4で連結されている。処理される原料粉鉱石5
は、原料供給管6からライザー1内に装入される。この
原料供給管6には流量調整弁等の原料供給装置7が設け
られており、原料粉鉱石5の装入量を調節する。装入さ
れた原料粉鉱石5は、散気管8から吹き込まれる還元ガ
スにより流動化された状態で還元される。In this fluidized bed pre-reduction furnace, a downcomer 2 is attached to a riser 1 constituting the main body of the fluidized bed furnace. The riser 1 and the downcomer 2 are connected by an outlet pipe 3 at the upper part and an introduction pipe 4 at the lower part. Raw material powder ore to be processed 5
is charged into the riser 1 from the raw material supply pipe 6. This raw material supply pipe 6 is provided with a raw material supply device 7 such as a flow rate regulating valve to adjust the amount of raw material powder ore 5 charged. The charged raw material powder ore 5 is reduced in a fluidized state by the reducing gas blown from the aeration pipe 8.
還元ガスとしては、溶融還元炉9で発生した排ガスを使
用することもできる。As the reducing gas, exhaust gas generated in the melting reduction furnace 9 can also be used.
ライザー1内に浮遊している原料粉鉱石5の一部は、還
元ガスの流れに随伴されて、導出管3を経由してサイク
ロン10に送られる。ここで、固気分離された粉鉱石は
、ダウンカマー2のホッパー11に蓄えられる。他方、
粉鉱石から分離されたガスは、排気管12から排ガス1
3として系外に放出される。ホッパー11に蓄えられて
いる粉鉱石は、導入管4を介して連続的又は藺歌的にラ
イザー1内に返送される。このとき、ホッパー11から
ライザーlへの切出しを円滑に行うため、導入管4の内
部にキャリアガス吹込み管を開口させることができる。A part of the raw material powder ore 5 floating in the riser 1 is accompanied by the flow of reducing gas and sent to the cyclone 10 via the outlet pipe 3. Here, the solid-gas separated fine ore is stored in the hopper 11 of the downcomer 2. On the other hand,
The gas separated from the fine ore is passed through the exhaust pipe 12 into the exhaust gas 1.
3 is released outside the system. The fine ore stored in the hopper 11 is returned to the riser 1 via the introduction pipe 4 continuously or in a continuous manner. At this time, in order to smoothly cut out the material from the hopper 11 to the riser l, a carrier gas blowing pipe can be opened inside the introduction pipe 4.
また、ホッパー11に蓄えられている粉鉱石の一部は、
移送管14を経て間歇的に溶融還元炉9に切り出される
。この移送管14には流量調整弁等の供給装置15が設
けられており、溶融還元炉9に対する粉鉱石切出し量を
調節する。In addition, some of the fine ore stored in hopper 11 is
It passes through the transfer pipe 14 and is intermittently cut out into the melting reduction furnace 9. This transfer pipe 14 is provided with a supply device 15 such as a flow rate regulating valve to adjust the amount of fine ore cut out to the smelting reduction furnace 9.
このような炉外循環経路を設けた流動層予備還元炉にお
いて、低レベル計18及び高レベル計19をホッパー1
1に設けている。これら低レベル計18及び高レベル計
19は、ホッパー11内に溜まった粉鉱石のレベルを検
出し、その検出値を電気信号として原料供給装置7に送
るように、点線で示した回線によって原料供給装置7に
電気的に接続されている。また、供給装置15が開又は
閉のいずれの状態にあるかをレベル調節計16.17に
入力して、相応するレベル計をオンするように、レベル
調節計16、17と供給装置15とが電気的に接続され
ている。In a fluidized bed pre-reduction furnace equipped with such an extra-furnace circulation path, the low level meter 18 and the high level meter 19 are connected to the hopper 1.
It is set at 1. These low level meter 18 and high level meter 19 detect the level of fine ore accumulated in the hopper 11 and supply the raw material through the line shown by the dotted line so that the detected value is sent to the raw material supply device 7 as an electric signal. It is electrically connected to the device 7. Further, the level controllers 16 and 17 and the supply device 15 are connected so that whether the supply device 15 is in an open or closed state is inputted to the level controllers 16 and 17 and the corresponding level meter is turned on. electrically connected.
レベル計18.19としては、ワイヤで吊るした重錘を
一定周期でモータ等によって上下動させ、堆積した粉鉱
石の表面に接触したときのワイヤの張力変化を検出する
ことにより、レベルを測定する方式が採用される。或い
は、サウンジング計、放射線計、超音波を利用したレベ
ル計等も使用可能である。これらのレベル計18.19
によって検出されたレベルは、レベル調節計16.17
に出力され、原料供給装置7をコントロールする。The level meter 18.19 measures the level by moving a weight suspended from a wire up and down at regular intervals using a motor, etc., and detecting changes in the tension of the wire when it comes into contact with the surface of the deposited fine ore. method is adopted. Alternatively, a sounding meter, a radiation meter, a level meter using ultrasonic waves, etc. can also be used. These level meters 18.19
The level detected by the level controller 16.17
and controls the raw material supply device 7.
溶融還元炉9に粉鉱石を切り出す供給装置15が開状態
にあるとき、その開状態を表す信号が低レベル調節計1
6に人力し、低レベル計18をオンする。When the supply device 15 for cutting fine ore into the smelting reduction furnace 9 is in an open state, a signal indicating the open state is sent to the low level controller 1.
6 and turn on the low level meter 18.
すなわち、ホッパー11内にある粉鉱石のレベルは、低
レベル計18によって検出される。そして、この検出値
は、原料供給装置7に出力されて、ライザー・1に送り
込まれる原料粉鉱石5の流量を制御する。That is, the level of fine ore in the hopper 11 is detected by the low level meter 18. This detected value is output to the raw material supply device 7 and controls the flow rate of the raw material powder ore 5 fed into the riser 1.
他方、出銑、排滓時には、溶融還元炉9に対する粉鉱石
の切出しが停止される。このとき、供給装置15は、閉
状態になっている。この閉状態を表す信号は、レベル調
節計17に出力され、高レベル計19をオンする。ここ
で、粉鉱石の切出しを停止している期間は、溶融還元炉
9の容量等に基づいてほぼ推定できる。したがって、こ
の期間に蓄えられる粉鉱石の量を計算して、その量に見
合った流量で原料粉鉱石5を送るように、レベル調節計
17から制御信号を原料供給管6に出力する。これによ
り、切出し停止時にホッパー11内に溜る粉鉱石の量は
多くなるものの、そのレベルには上限がありホッパー1
1を溢れ出すようなことはなくなる。On the other hand, during tapping and slag removal, cutting of fine ore to the smelting reduction furnace 9 is stopped. At this time, the supply device 15 is in a closed state. This signal indicating the closed state is output to the level controller 17 and turns on the high level meter 19. Here, the period during which cutting of fine ore is stopped can be approximately estimated based on the capacity of the smelting reduction furnace 9, etc. Therefore, the amount of fine ore to be stored during this period is calculated, and a control signal is output from the level controller 17 to the raw material supply pipe 6 so that the raw material fine ore 5 is sent at a flow rate commensurate with the calculated amount. As a result, the amount of fine ore that accumulates in the hopper 11 when cutting is stopped increases, but there is an upper limit to the level and the hopper 1
There will be no more overflowing numbers.
なお、レベル調節計17からの制御信号に基づき、散気
管8を介して送り込まれる還元ガスの流量、及び導入管
4の器壁から吹き込まれるキャリアガスの流量を制御す
ることもできる。すなわち、溶融還元炉9に対する粉鉱
石の切出しを停止している間は原料粉鉱石5の装入量は
減少している。そこで、この減少した装入量に対応する
還元ガス及びキャリアガスを吹き込むことにより、粉鉱
石の還元が過度に進行することなく、ライザー1内で安
定した流動状態を維持することができる。In addition, based on the control signal from the level controller 17, the flow rate of the reducing gas sent through the diffuser pipe 8 and the flow rate of the carrier gas blown in from the wall of the introduction pipe 4 can also be controlled. That is, while the cutting of fine ore to the smelting reduction furnace 9 is stopped, the amount of raw material fine ore 5 charged is decreasing. Therefore, by blowing reducing gas and carrier gas corresponding to this reduced charging amount, a stable fluid state can be maintained within the riser 1 without excessively proceeding with the reduction of the fine ore.
このようにして、溶融還元炉9に対する粉鉱石の切出し
時或いは切出し停止時のいずれにあっても、粉鉱石をラ
イザー1とダウンカマー2との間を循環させる連続運転
が可能となる。また、ホッパー11に多量の粉鉱石を蓄
えることもなくなる。In this way, continuous operation is possible in which the fine ore is circulated between the riser 1 and the downcomer 2, whether the fine ore is being cut into the smelting reduction furnace 9 or when the cutting is stopped. Further, it is no longer necessary to store a large amount of fine ore in the hopper 11.
そのため、スティッキング等によって循環経路が閉塞す
ることがなく、また粉鉱石が過度に還元されることもな
くなる。更には、炉外循環経路に多量の粉鉱石が堆積し
ないため、ホッパ−11自体を省略して配管に代えるこ
とも可能となる。Therefore, the circulation path will not be blocked due to sticking or the like, and the fine ore will not be reduced excessively. Furthermore, since a large amount of fine ore does not accumulate in the external circulation path, the hopper 11 itself can be omitted and replaced with piping.
以上に説明したように、本発明においては、溶融還元炉
に対する粉鉱石の切出し、或いは切出し停止に応じて、
ライザーに装入する原料粉鉱石の装入量を変更し、且つ
ダウンカマーに堆積する粉鉱石のレベルを変更している
。そして、切出し停止時においても、流動層炉の運転を
休止させることなく、安定した条件下で粉鉱石とライザ
ーとダウンカマーとの間に循環・流動させている。その
ため、粉鉱石のスティッキングによって炉外循環経路を
閉塞することがなくなり、流動層炉の生産性が向上する
。また、切出し停止時に、流動層炉に吹き込まれる還元
ガスの流量を調整するとき、粉鉱石が過度に還元される
ことがなくなるので、一定した品質の還元鉱が製造され
る。As explained above, in the present invention, depending on the cutting of fine ore to the smelting reduction furnace or the stopping of cutting,
The amount of raw ore powder charged into the riser is changed, and the level of ore powder deposited in the downcomer is changed. Even when cutting is stopped, the ore powder is circulated and fluidized between the riser and the downcomer under stable conditions without stopping the operation of the fluidized bed furnace. Therefore, the sticking of fine ore does not block the circulation path outside the furnace, and the productivity of the fluidized bed furnace improves. Further, when adjusting the flow rate of the reducing gas blown into the fluidized bed furnace when cutting is stopped, fine ore is not reduced excessively, so reduced ore of constant quality is produced.
第1図は、本発明の流動層予備還元炉を示す概略図であ
る。
1:ライザ−2=ダウンカマー
3:導出管 4:導入管
5:原料粉鉱石 6:原料供給管7:原料供給
装置 8:散気管
9:溶融還元炉 10:サイクロン11:ホッ
パ−12:排気管
13:排ガス 14:移送管15:供給装
置 16:レベル調節計17二レベル調節計
18:低レベル計19:高レベル計
第1図FIG. 1 is a schematic diagram showing a fluidized bed pre-reduction furnace of the present invention. 1: Riser 2 = Downcomer 3: Outlet pipe 4: Inlet pipe 5: Raw material powder ore 6: Raw material supply pipe 7: Raw material supply device 8: Diffuser pipe 9: Melting reduction furnace 10: Cyclone 11: Hopper 12: Exhaust Pipe 13: Exhaust gas 14: Transfer pipe 15: Supply device 16: Level controller 17 Two-level controller 18: Low level meter 19: High level meter Figure 1
Claims (1)
計及び低レベル計と、前記ダウンカマーから予備還元さ
れた粉鉱石を溶融還元炉に切り出す移送管の途中に設け
た供給装置と、前記ライザー内に粉鉱石を装入する原料
供給管の途中に設けた原料供給装置と、前記高レベル計
及び前記低レベル計と前記供給装置及び前記原料装入装
置とを電気的に接続する回線とを備えていることを特徴
とする流動層予備還元炉。 2、予備還元された粉鉱石を溶融還元炉に装入している
とき、ダウンカマー内にある粉鉱石のレベルを低レベル
計で検出し、前記ダウンカマー内に少量の粉鉱石が溜る
ように、粉鉱石を前記ライザーと前記ダウンカマーとの
間で循環させ、前記溶融還元炉に対する粉鉱石の供給を
停止しているとき、前記ダウンカマー内にある粉鉱石の
レベルを高レベル計で検出し、高レベル状態で粉鉱石を
前記ライザーと前記ダウンカマーとの間で循環させるこ
とを特徴とする流動層予備還元炉の運転方法。[Claims] 1. A high level meter and a low level meter provided in a downcomer attached to the riser, and a supply provided in the middle of a transfer pipe that cuts the pre-reduced fine ore from the downcomer to the smelting reduction furnace. The device, a raw material supply device provided in the middle of a raw material supply pipe for charging fine ore into the riser, the high level meter, the low level meter, the supply device, and the raw material charging device are electrically connected. A fluidized bed pre-reduction reactor, characterized in that it is equipped with a connecting line. 2. When pre-reduced fine ore is being charged into the smelting reduction furnace, the level of fine ore in the downcomer is detected with a low level meter, and a small amount of fine ore is collected in the downcomer. , when fine ore is circulated between the riser and the downcomer and the supply of fine ore to the smelting reduction furnace is stopped, the level of fine ore in the downcomer is detected by a high level meter. . A method of operating a fluidized bed pre-reduction furnace, characterized in that fine ore is circulated between the riser and the downcomer at a high level.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7724388A JPH01247514A (en) | 1988-03-29 | 1988-03-29 | Fluidized bed pre-reduction furnace and operating method thereof |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7724388A JPH01247514A (en) | 1988-03-29 | 1988-03-29 | Fluidized bed pre-reduction furnace and operating method thereof |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH01247514A true JPH01247514A (en) | 1989-10-03 |
Family
ID=13628419
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP7724388A Pending JPH01247514A (en) | 1988-03-29 | 1988-03-29 | Fluidized bed pre-reduction furnace and operating method thereof |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH01247514A (en) |
-
1988
- 1988-03-29 JP JP7724388A patent/JPH01247514A/en active Pending
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