JPH0320443B2 - - Google Patents
Info
- Publication number
- JPH0320443B2 JPH0320443B2 JP22014785A JP22014785A JPH0320443B2 JP H0320443 B2 JPH0320443 B2 JP H0320443B2 JP 22014785 A JP22014785 A JP 22014785A JP 22014785 A JP22014785 A JP 22014785A JP H0320443 B2 JPH0320443 B2 JP H0320443B2
- Authority
- JP
- Japan
- Prior art keywords
- reduction
- ore
- fluidized bed
- reduction rate
- rate
- 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
Links
- 230000009467 reduction Effects 0.000 claims description 39
- 238000000034 method Methods 0.000 claims description 14
- 238000007599 discharging Methods 0.000 claims description 2
- 238000006722 reduction reaction Methods 0.000 description 39
- 239000002994 raw material Substances 0.000 description 14
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 13
- 238000009826 distribution Methods 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 7
- 229910052742 iron Inorganic materials 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000012530 fluid Substances 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 229910001021 Ferroalloy Inorganic materials 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- -1 ferrous metals Chemical class 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000011946 reduction process Methods 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 241001062472 Stokellia anisodon Species 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000005243 fluidization Methods 0.000 description 1
- 230000003179 granulation Effects 0.000 description 1
- 238000005469 granulation Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000007885 magnetic separation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000012256 powdered iron Substances 0.000 description 1
- 239000012255 powdered metal Substances 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Landscapes
- Manufacture And Refinement Of Metals (AREA)
- Manufacture Of Iron (AREA)
- Manufacture Of Metal Powder And Suspensions Thereof (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は鉄鋼、フエロアロイまたは非鉄金属の
粉状鉱石を流動層において還元する方法に関し、
さらに詳しく述べると、還元鉱石の平均還元率を
上昇させると共に還元率の分布の幅を狭く一様な
還元率とすることを特徴とする流動層還元方法に
関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for reducing powdery ores of steel, ferroalloys or non-ferrous metals in a fluidized bed,
More specifically, the present invention relates to a fluidized bed reduction method characterized by increasing the average reduction rate of reduced ore and making the reduction rate distribution narrow and uniform.
近年、金属鉱石は粉状原料が増加する事情にあ
り、このような鉱石を還元処理して鉄鋼、フエロ
アロイ、非鉄金属を製錬する工程では、塊成化や
造粒工程を省略して粉状のまま還元する技術が主
となつている。また、鉄粉の製造、直接製鉄の予
備還元、鉄および／または他の金属の溶融還元の
予備還元等、粉状のまま還元することが必要であ
つたり、メリツトが多い場合も多々ある。
In recent years, the amount of powdered metal ore has increased, and in the process of reducing such ore to smelt steel, ferroalloys, and non-ferrous metals, agglomeration and granulation processes are omitted and powdered raw materials are used. The main technology is to return the waste as it is. Further, there are many cases where reduction in powder form is necessary or has many advantages, such as in the production of iron powder, preliminary reduction in direct iron manufacturing, and preliminary reduction in smelting reduction of iron and/or other metals.
このような粉状鉱石を還元する場合、流動層を
用いて還元すると、還元反応の反応性が優れてい
るので適切である。 When reducing such powdery ore, it is appropriate to reduce using a fluidized bed because the reactivity of the reduction reaction is excellent.
この場合、単段の流動層で連続的に鉱石を還元
すると、鉱石が流動層内に滞留する平均滞留時間
は、
（炉内に滞留する鉱石量）／（鉱石装入速度）
で決定され、長時間滞留させることは可能である
が、流動層の特性上、導入された原料鉱石の一部
が平均滞留時間より短い時間で製品として排出さ
れることを避けることができない。 In this case, when ore is continuously reduced in a single-stage fluidized bed, the average residence time for ore to remain in the fluidized bed is determined by (amount of ore retained in the furnace)/(ore charging rate), Although it is possible to retain the fluid for a long time, due to the characteristics of the fluidized bed, it is unavoidable that a part of the introduced raw material ore is discharged as a product in a time shorter than the average residence time.
従つて、平均還元率の低下や還元率分布幅の増
大をもたらす。 Therefore, this results in a decrease in the average return rate and an increase in the width of the return rate distribution.
鉄粉粗還元の場合を例にとつて見ると、通常、
還元率は98％以上とするが、粗還元工程で平均還
元率をできるだけ高めておくと同時に、還元率の
分布幅を狭くし、ばらつきを少なくしておくこと
は仕上還元工程における負荷軽減、品質向上のた
めに必要である。特に、還元率の低い鉄粉の混入
は製品にクラツク等の欠陥を生ずる原因となり好
ましくない。また、他の鉱石の還元の場合でも、
還元率の向上、ばらつきの減少はコスト低減に貢
献する。 Taking the case of rough reduction of iron powder as an example, normally,
The reduction rate should be 98% or more, but it is important to increase the average reduction rate as much as possible in the rough reduction process, and at the same time narrow the distribution width of the reduction rate and reduce the variation, which will reduce the load in the final reduction process and improve quality. It is necessary for improvement. In particular, the mixing of iron powder with a low reduction rate is undesirable because it causes defects such as cracks in the product. Also, even in the case of reduction of other ores,
Improving the return rate and reducing variation contribute to cost reduction.
このような観点から、還元率を高めると共に還
元率分布幅を狭くする多段流動化法（特公昭51−
34386）が開発されて成果を収めているが、装置
の構造が複雑となることが否めない。このことは
日本鉄鋼協会編：鉄鋼便覧第３版の349頁図
６・14、FIOR法のフローシートで示されている
装置でも同様である。 From this point of view, the multi-stage fluidization method (Special Public Interest Publication in 1973-1983) was developed to increase the reduction rate and narrow the reduction rate distribution width.
34386) has been developed and achieved success, but it cannot be denied that the structure of the device is complicated. This also applies to the equipment shown in Figures 6 and 14 on page 349 of the Iron and Steel Handbook, 3rd edition, compiled by the Japan Iron and Steel Institute, and the flow sheet of the FIOR method.
本発明者らは流動還元法において、複雑な多段
の装置等を用いることなく、単段の簡単な装置で
平均還元率を高め、還元率の分布幅をせばめるこ
とを検討し、滞留時間のばらつきを減少させる方
法によつて本問題の解決を図つた。本発明はこの
ような流動層還元方法を提供することを目的とし
ている。
In the fluidized reduction method, the present inventors investigated increasing the average reduction rate and narrowing the distribution width of the reduction rate with a simple single-stage device without using complicated multi-stage devices, etc., and by reducing the residence time. We attempted to solve this problem by reducing the variation. The present invention aims to provide such a fluidized bed reduction method.
本発明は、流動層への原料装入と製品排出が従
来は第１図のａに示すように連続操業であつた
が、これを第１図のｂに示したように、原料装入
と製品排出との間に原料、製品の装入排出を流動
状態を保持しつつ一時中止する還元保持期を設定
することによつて問題の解決を図つた。
In the present invention, the charging of raw materials into the fluidized bed and the discharge of products were conventionally carried out in a continuous manner as shown in a of FIG. We attempted to solve the problem by setting a reduction and holding period during which the charging and discharging of raw materials and products is temporarily stopped while maintaining the fluid state between product discharge and product discharge.
通常の流動層の操業法である連続原料装入、連
続製品排出に代り、原料装入を一定時間行つたあ
と、原料装入も製品排出も行なわない一定の保持
時間を設け、次に製品排出を一定時間行い、次に
製品排出を中止し原料装入を再開する。この場
合、製品の排出は全量行わず、少なくとも流動状
態を維持する最低量の製品を炉内に残しておくこ
とにする。原料装入と製品排出は同時には行わな
い。その結果、原料は少なくとも保持時間中は流
動層内に滞留する。
Instead of continuous raw material charging and continuous product discharge, which is the usual fluidized bed operation method, after raw material charging is performed for a certain period of time, a certain holding period is established in which neither material charging nor product discharge is performed, and then product discharge is performed. This is done for a certain period of time, then product discharge is stopped and raw material charging is resumed. In this case, all of the product is not discharged, but at least the minimum amount of product that maintains a fluid state is left in the furnace. Raw material charging and product discharge are not performed at the same time. As a result, the feedstock remains in the fluidized bed for at least the holding time.
従つて、還元率の向上を図ることができ、還元
の進んでいない粒子の排出がなくなり、還元率分
布幅が減少し、高い還元率で一様な還元率の製品
を得ることができる。 Therefore, the reduction rate can be improved, particles that have not been reduced are not discharged, the reduction rate distribution width is reduced, and a product with a high and uniform reduction rate can be obtained.
第２図に本発明方法の実施に用いた装置を示し
た。
FIG. 2 shows the apparatus used to carry out the method of the present invention.
還元炉１は下部にガス分散板２を備え、原料供
給フイーダ３から原料を供給し、高温還元ガス供
給装置４から高温の還元ガスを供給して還元炉内
の原料を流動化して還元反応を行わせ、還元鉱石
排出口６から排出する。還元炉１の排ガスはサイ
クロン７を経て次の工程に送られる。 The reduction furnace 1 is equipped with a gas distribution plate 2 at the lower part, supplies raw materials from a raw material supply feeder 3, and supplies high-temperature reducing gas from a high-temperature reducing gas supply device 4 to fluidize the raw materials in the reduction furnace and perform a reduction reaction. The reduced ore is discharged from the reduced ore discharge port 6. The exhaust gas from the reduction furnace 1 is sent to the next step via a cyclone 7.
第２図に示す装置を用い、下記の還元条件で粉
状鉄鉱石の流動還元を行つた。 Powdered iron ore was subjected to fluid reduction using the apparatus shown in FIG. 2 under the following reduction conditions.
比較例では原料供給フイーダ３を連続運転し、
還元鉱石を連続的に排出した。 In the comparative example, the raw material supply feeder 3 was operated continuously,
Continuously discharged reduced ore.
実施例では、第１図のタイムチヤートにセミバ
ツチ操業として示すように、原料供給フイーダ３
を１時間運転、２時間停止し、還元鉱石排出口６
も１時間開放、２時間閉止する間欠開閉を行つ
た。 In the embodiment, as shown in the time chart of FIG. 1 as a semi-batch operation, the raw material supply feeder 3
was operated for 1 hour, stopped for 2 hours, and the reduced ore discharge port 6
The valve was also opened and closed intermittently for 1 hour and closed for 2 hours.
操業条件は次の通りである。 The operating conditions are as follows.
還元炉内径：400mmφ 鉱石銘柄：ブラジルMBR鉄鉱石 〃 粒径：１mm〜200メツシユ 還元ガス量：167Nm3／Hr 〃 組成：H2 25％ CO 20％ H2O＋CO ５％ N2 50％ 〃 温度：1000℃ 流動層内反応温度：870℃ 鉱石供給速度： 連続操業（比較例）：17Kg／Hr セミバツチ操業（実施例）： 51Kg／Hr １時間 ０Kg／Hr ２時間 平均17Kg／Hr 還元鉱石排出速度： 連続操業（比較例）：10Kg／Hr セミバツチ操業（実施例）： 30Kg／Hr １時間 ０Kg／Hr ２時間 平均10Kg／Hr 以上の結果、次の成績を得た。Reduction furnace inner diameter: 400mmφ Ore brand: Brazilian MBR iron ore 〃 Particle size: 1 mm ~ 200 mesh Reducing gas amount: 167Nm 3 /Hr 〃 Composition: H 2 25% CO 20% H 2 O + CO 5% N 2 50% 〃 Temperature: 1000℃ Reaction temperature in fluidized bed: 870℃ Ore supply rate: Continuous operation (comparative example): 17Kg/Hr Semi-batch operation (example): 51Kg/Hr 1 hour 0Kg/Hr 2 hours Average 17Kg/Hr Reduced ore discharge rate: Continuous operation (comparative example): 10Kg/Hr Semi-batch operation (example): 30Kg/Hr 1 hour 0Kg/Hr 2 hours Average of 10Kg/Hr The following results were obtained.
製品還元率：
連続操業（比較例）：92.1％
セミバツチ操業（実施例）：95.7％
製品磁選後の尾鉱割合：
連続操業（比較例）：２％
セミバツチ操業（実施例）：0.5％
尾鉱平均還元率：
連続操業（比較例）：75.3％
セミバツチ操業（実施例）：90.6％
これらの数値から、本発明方法では、比較例に
比し、還元率が向上すると共に、そのばらつきが
著しく減少したことが解る。Product reduction rate: Continuous operation (comparative example): 92.1% Semi-batch operation (example): 95.7% Tailings ratio after product magnetic separation: Continuous operation (comparative example): 2% Semi-batch operation (example): 0.5% Tailings Average reduction rate: Continuous operation (comparative example): 75.3% Semi-batch operation (example): 90.6% From these values, the method of the present invention improves the reduction rate and significantly reduces its dispersion compared to the comparative example. I understand what happened.
実施例から明らかなように、多段の流動層を設
けることなく、平均還元率の向上と還元率分布の
均一化を達成することができ、簡易な装置で優れ
た還元効果を奏する。
As is clear from the examples, it is possible to improve the average reduction rate and make the reduction rate distribution uniform without providing a multi-stage fluidized bed, and an excellent reduction effect can be achieved with a simple device.
第１図は従来の連続操業と本発明方法の実施例
のセミバツチ操業のタイムチヤート、第２図は本
発明方法の適用される装置の系統図である。
１……還元炉、２……ガス分散板、３……原料
供給スクリユーフイーダ、４……高温還元ガス供
給装置、５……還元ガス入口、６……還元鉱石排
出口、７……サイクロン。
FIG. 1 is a time chart of a conventional continuous operation and a semi-batch operation according to an embodiment of the method of the present invention, and FIG. 2 is a system diagram of an apparatus to which the method of the present invention is applied. 1... Reduction furnace, 2... Gas distribution plate, 3... Raw material supply screw feeder, 4... High temperature reducing gas supply device, 5... Reducing gas inlet, 6... Reduced ore outlet, 7... Cyclone.
Claims (1)
石装入期と、内容物の装入排出を中止して還元す
る還元保持期と、流動状態を保持しつつ流動層か
ら還元鉱石を排出する排出期とを、順次繰返すこ
とを特徴とする流動層還元方法。1. When reducing ore in a fluidized bed, there is a period of charging the ore to the fluidized bed, a reduction holding period in which charging and discharging of the contents is stopped and the content is reduced, and a period in which the reduced ore is discharged from the fluidized bed while maintaining the fluidized state. A fluidized bed reduction method characterized by sequentially repeating a discharge period.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22014785A JPS6280211A (en) | 1985-10-04 | 1985-10-04 | Method for reducing fluid layer of ore |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22014785A JPS6280211A (en) | 1985-10-04 | 1985-10-04 | Method for reducing fluid layer of ore |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6280211A JPS6280211A (en) | 1987-04-13 |
| JPH0320443B2 true JPH0320443B2 (en) | 1991-03-19 |
Family
ID=16746630
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22014785A Granted JPS6280211A (en) | 1985-10-04 | 1985-10-04 | Method for reducing fluid layer of ore |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6280211A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104801721B (en) * | 2015-05-15 | 2017-05-31 | 中国科学院过程工程研究所 | A kind of device and method for preparing nano metal powder |
-
1985
- 1985-10-04 JP JP22014785A patent/JPS6280211A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6280211A (en) | 1987-04-13 |
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