JPS6320403A - Method for recovering pure iron powder from converter dust - Google Patents
Method for recovering pure iron powder from converter dustInfo
- Publication number
- JPS6320403A JPS6320403A JP16533386A JP16533386A JPS6320403A JP S6320403 A JPS6320403 A JP S6320403A JP 16533386 A JP16533386 A JP 16533386A JP 16533386 A JP16533386 A JP 16533386A JP S6320403 A JPS6320403 A JP S6320403A
- Authority
- JP
- Japan
- Prior art keywords
- converter
- iron powder
- dust
- purity
- converter dust
- 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
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 55
- 239000000428 dust Substances 0.000 title claims abstract description 51
- 238000000034 method Methods 0.000 title claims description 15
- 238000007664 blowing Methods 0.000 claims abstract description 11
- 230000001590 oxidative effect Effects 0.000 claims abstract description 11
- 239000007789 gas Substances 0.000 abstract description 22
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 4
- 230000005484 gravity Effects 0.000 abstract description 4
- 239000001301 oxygen Substances 0.000 abstract description 4
- 229910052760 oxygen Inorganic materials 0.000 abstract description 4
- 239000012535 impurity Substances 0.000 abstract description 3
- 238000011084 recovery Methods 0.000 description 14
- 229910052742 iron Inorganic materials 0.000 description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 3
- 229910001873 dinitrogen Inorganic materials 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000005422 blasting Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000004663 powder metallurgy Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 229910000805 Pig iron Inorganic materials 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000007885 magnetic separation Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、転炉より発生する転炉ダストを非酸化性雰囲
気下の転炉ガスから回収した後に、分級して高純度鉄粉
とする転炉ダストからの純鉄粉回収法に関する。Detailed Description of the Invention (Field of Industrial Application) The present invention is to collect converter dust generated from a converter from converter gas in a non-oxidizing atmosphere and then classify it into high-purity iron powder. Concerning a method for recovering pure iron powder from converter dust.
（従来の技術）
通常、よく知られているように、酸素吹錬時に転炉から
排気される転炉ガスには、約１００ ｇ／Ｎｍ’の多量
のダストが転炉ダストとして含まれている。(Prior Art) As is well known, the converter gas exhausted from the converter during oxygen blowing usually contains a large amount of dust of about 100 g/Nm' as converter dust. .
この転炉ダストは排ガス処理上除去されるべきものであ
り、従来、ベンチュリースクラバー等の湿式除塵方式に
より回収されていた。This converter dust must be removed for exhaust gas treatment, and has conventionally been collected using a wet dust removal method such as a venturi scrubber.
このようにして回収された湿式回収ダストは、例えば、
第１表に示すように９０％以上がＦｅ、 ＦｅＯであ
るため、シックナーで回収し、焼結工程を経て、製銑材
料の鉄源として利用され、製鉄の歩留向上に寄与してい
た。The wet collected dust collected in this way is, for example,
As shown in Table 1, more than 90% of the iron is Fe and FeO, so it is collected in a thickener, goes through a sintering process, and is used as an iron source for ironmaking materials, contributing to improved yields in ironmaking.
一方、特開昭５４−１２７８１０号公報では、純酸素吹
錬時に、転炉で発生する転炉ダスト中の金属鉄粉の鉄含
量が高いことやその硬度に着目して、転炉から湿式回収
したダストを粉砕し分級した後にショツトブラスト用の
ショットやグリツドとして製造する方法の捷案がなされ
ていた。On the other hand, in JP-A-54-127810, focusing on the high iron content and hardness of metal iron powder in the converter dust generated in the converter during pure oxygen blowing, wet recovery from the converter is proposed. A method has been devised to produce shot or grit for shot blasting after pulverizing and classifying the dust.
（発明が解決しようとする問題点）
しかし、この転炉ダストから回収した鉄分を、製銑原料
として利用することを考えても、確かに製鉄の歩留向上
には寄与するが、結局、銑鉄原料として利用する域を出
ることはなかった。(Problem to be solved by the invention) However, even if we consider using the iron recovered from this converter dust as a raw material for pig iron production, although it certainly contributes to improving the yield of iron production, It never went beyond being used as a raw material.
また、シッントブラストとしての別の利用法について考
えても、転炉ダスト中の金属粉の鉄含量が高いこととそ
の硬度の高いことを利用したにすぎず、単に、出発原料
の特性をそのまま利用しているだけであった。In addition, even if we consider another method of using it as shint blasting, it simply takes advantage of the high iron content and high hardness of the metal powder in the converter dust. It was just being used.
このように従来にあって付加価値の高い転炉ダストの回
収利用方法はなかったのであった。As described above, there has been no conventional method for collecting and utilizing converter dust with high added value.
ここに、本発明の目的とするところは、転炉ダストのよ
り付加価値の高い回収利用方法を提供することである。An object of the present invention is to provide a method for recovering and using converter dust with higher added value.
（問題点を解決するための手段）
本発明者らはかかる目的達成の手段について検討したと
ころ、今日の粉末冶金技術の目ざましい発展によって高
純度鉄粉が多量に必要とされていることを知り、転炉ダ
ストからそのような高純度鉄粉を製造することを着想し
た。(Means for Solving the Problems) The inventors of the present invention studied means for achieving the above object, and learned that large amounts of high-purity iron powder are required due to the remarkable development of today's powder metallurgy technology. The idea was to produce such high-purity iron powder from converter dust.
なお、従来、この転炉ダストの回収方法はその多くが１
式であったため、水により転炉ダスト中のＦｅが酸化さ
れてしまい、純鉄（Ｆｅ）の回収率が下がることから、
高純度の純鉄粉の回収はそのままでは行えないものと考
えられていた。還元そして粉砕というさらに別の工程を
経なければならなかった。In addition, conventionally, most of the methods for collecting this converter dust are 1.
Because of this, Fe in the converter dust will be oxidized by water and the recovery rate of pure iron (Fe) will decrease.
It was thought that it would be impossible to recover high-purity pure iron powder as it was. Additional steps had to be taken: reduction and grinding.
そこで、本発明者らは、この転炉ダストを乾式で回収す
る方法に着目して、その検討を行ったところ、転炉から
発生する転炉ガスは高温（１０００〜１４００℃）で排
出され、未燃焼状態でその組成が００７０％、Ｃ（ｈ
１５％、Ｎ第１３％であるＣＯ濃度の高い高温還元ガス
であり、また酸素の少ない非酸化性雰囲気であるから、
非酸化性雰囲気下の転炉ガスから転炉ダストを乾式で回
収すると、７０％以上の回収率で転炉ダストが得られ、
しかもこのようにして回収された転炉ダストは分級とい
う極めて簡単な操作でもってＦｅ分を高純度化できるこ
とを知り、本発明を完成した。Therefore, the present inventors focused on a method of recovering this converter dust using a dry method, and found that the converter gas generated from the converter is discharged at a high temperature (1000 to 1400°C). Its composition in the unburned state is 0070%, C(h
It is a high-temperature reducing gas with a high CO concentration of 15% and 13% N, and it is a non-oxidizing atmosphere with little oxygen.
When converter dust is dry-recovered from converter gas in a non-oxidizing atmosphere, converter dust can be obtained with a recovery rate of over 70%.
Furthermore, the present invention was completed based on the knowledge that the Fe content of the thus recovered converter dust could be made highly purified by an extremely simple operation of classification.
ここで、本発明の要旨とするところは、転炉吹錬で発生
する転炉ダストを非酸化性雰囲気下の転炉ガスから回収
し、この回収した転炉ダストを分級し、高純度鉄粉を得
ることを特徴とする、転炉ダストからの純鉄粉回収法で
ある。Here, the gist of the present invention is to collect converter dust generated in converter blowing from converter gas in a non-oxidizing atmosphere, classify the collected converter dust, and then produce high-purity iron powder. This is a method for recovering pure iron powder from converter dust, which is characterized by obtaining pure iron powder from converter dust.
なお、このようにして回収された高純度鉄粉は一般に純
度９６％以上まで高められている。しかも、これは安価
に得られるのである。したがって、工業用の高純度鉄粉
として十分使用に耐えるものである。Note that the high purity iron powder recovered in this manner generally has a purity of 96% or more. Moreover, this can be obtained at low cost. Therefore, it is sufficiently usable as industrial high-purity iron powder.
このように、本発明は、安価で純度の高い純鉄粉（Ｆｅ
）を得ることのできるきわめて有益な方法である。In this way, the present invention provides inexpensive and highly pure pure iron powder (Fe
) is an extremely useful method.
（作用）
ここで、本発明を添付図面を用いてさらに具体的に説明
する。(Function) Here, the present invention will be explained in more detail using the accompanying drawings.
添付図面は、本発明にかかる方法の各工程を説明する模
式的説明図である。The accompanying drawings are schematic explanatory diagrams illustrating each step of the method according to the present invention.
転炉１の酸素吹錬時に発生する転炉ダストは、排ガス回
収系統２の途中に設けた乾式ダスト回収装置３で未燃焼
の非酸化性雰囲気下の転炉ガスから回収される。なお、
この乾式ダスト回収装置３はセラミックフィルター等の
耐熱フィルターを使って除塵回収する形式のものであっ
てもよい。Converter dust generated during oxygen blowing in the converter 1 is recovered from unburned converter gas under a non-oxidizing atmosphere by a dry dust recovery device 3 provided in the middle of the exhaust gas recovery system 2. In addition,
This dry dust collection device 3 may be of a type that uses a heat-resistant filter such as a ceramic filter to remove and collect dust.
この乾式ダスト回収装置３で除塵されて清浄化された転
炉ガスは再び排ガス回収系統２を通り、ガスクーラー４
で冷却された後、誘引ファン５により吸引され、吹錬初
期の転炉ガスは煙道６を経て燃焼廃棄され、吹錬中の転
炉ガスはガスホルダー７に適宜回収、貯蔵される。The converter gas, which has been cleaned and dusted by the dry dust recovery device 3, passes through the exhaust gas recovery system 2 again, and then passes through the gas cooler 4.
After being cooled, it is sucked in by an induction fan 5, and the converter gas at the initial stage of blowing is combusted and disposed of through a flue 6, and the converter gas during blowing is appropriately collected and stored in a gas holder 7.
ところで、乾式ダスト回収装置３で回収された転炉ダス
トは、Ｆｅ純度が８０〜９０％程度であるが、純鉄粉回
収装置８で他の酸化物（例えば、ＣａＯ１ＺｎＯ、Ｍｇ
Ｏなど）と比重差、磁気的性質、その他の物理的特性の
差異を利用して分級することによりＦｅ以外の不純物が
除去されて、回収ダスト中の純鉄粉の高純度化が行われ
る。このような分級操作によりＦｅ純度はは７９６５以
上となる。なお、この純鉄粉回収装置８内は発生する転
炉ガスあるいは窒素ガス等の非酸化性ガスにより、非酸
化性雰囲気に保たれている。By the way, the converter dust recovered by the dry dust recovery device 3 has an Fe purity of about 80 to 90%, but the pure iron powder recovery device 8 removes other oxides (for example, CaO1ZnO, Mg
Impurities other than Fe are removed by classification using differences in specific gravity, magnetic properties, and other physical properties (O, etc.), and the pure iron powder in the recovered dust is highly purified. Through such a classification operation, the Fe purity becomes 7965 or higher. Note that the inside of the pure iron powder recovery device 8 is maintained in a non-oxidizing atmosphere by generated converter gas or non-oxidizing gas such as nitrogen gas.
なお、上記分級は、例えば窒素ガスによる気体分級、磁
選、さらにはテーブル選鉱等、比重差あるいは磁気的性
質の差による分級の可能な適宜手段によって行うことが
できる。The above-mentioned classification can be performed by any suitable means capable of classification based on differences in specific gravity or magnetic properties, such as gas classification using nitrogen gas, magnetic separation, or table separation.
次に、本発明の詳細な説明する。Next, the present invention will be explained in detail.
実施例
本例では、添付図面に示す装置を用いて、２５０トン転
炉で２０分間転炉吹錬を行ったときに転炉ダストを回収
し、分級により高純度鉄粉を得た。Example In this example, converter dust was collected when converter blowing was performed for 20 minutes in a 250-ton converter using the apparatus shown in the attached drawings, and high-purity iron powder was obtained by classification.
転炉から回収された転炉ダスト量は１７５０ｋｇ／ｃｈ
であった。また、乾式ダスト回収装置に回収された転炉
ダストの成分組成は、第２表に示す通りであった。平均
粒径は１４０μ欄であった。The amount of converter dust collected from the converter was 1750 kg/ch.
Met. Further, the component composition of the converter dust collected by the dry dust collection device was as shown in Table 2. The average particle size was 140μ.
次に、この回収された転炉ダストを鉄粉回収装置で窒素
ガスを使った気体分級操作によりほぼ比重５．０以下の
ものを不純物として除去した。得られた回収鉄粉の成分
組成は第３表の通りであった。Next, the collected converter dust was subjected to a gas classification operation using nitrogen gas in an iron powder recovery device to remove impurities with a specific gravity of approximately 5.0 or less. The component composition of the obtained recovered iron powder was as shown in Table 3.
このようにして回収した純鉄粉の回収量は１１７０ｋｇ
／ａｈであり、乾式ダスト回収装置で回収されたダスト
量の１７５０ｋｇ／ａｈに対して約６６％の回収率であ
った。The amount of pure iron powder recovered in this way was 1170 kg.
/ah, which was a recovery rate of about 66% based on the amount of dust collected by the dry dust collection device, which was 1750 kg/ah.
（発明の効果）
このように、本発明によれば、中１炉吹錬開始から転炉
ダストの純鉄（Ｆｅ）粉の回収までに多くの時間を必要
とせずに、設備も簡単にすみ、容易に安価な高純度鉄粉
が得られる。(Effects of the Invention) As described above, according to the present invention, it does not require much time from the start of middle furnace blowing to the recovery of pure iron (Fe) powder from converter dust, and the equipment can be easily installed. , inexpensive high-purity iron powder can be easily obtained.
また、本発明により最終的に得られる高純度鉄粉は乾式
回収ダスト量に対して６６％の回収率であり、しかも純
度が９６％以上で極めて高純度であるため、高純度鉄粉
としての利用価値が高い。In addition, the high-purity iron powder finally obtained by the present invention has a recovery rate of 66% based on the amount of dry-recovered dust, and has an extremely high purity of 96% or more, so it can be used as a high-purity iron powder. Highly useful.
また、本発明により安価な高純度鉄粉が大量に供給され
れば、例えば粉末冶金用および酸化発熱具（カイロ）用
等の鉄粉材料として使用する場合の安価な高純度鉄粉材
料の供給源として、本発明が与える利益は大きい。In addition, if a large amount of inexpensive high-purity iron powder is supplied according to the present invention, inexpensive high-purity iron powder material can be supplied when used as an iron powder material for powder metallurgy and oxidation heating tools (warmers), etc. As a source, the benefits provided by the present invention are significant.
添付図面は、本発明にかかる方法の各工程を示す模式説
明図である。The accompanying drawings are schematic illustrations showing each step of the method according to the present invention.
Claims (1)
炉ガスから回収し、この回収した転炉ダストを分級し、
高純度鉄粉を得ることを特徴とする、転炉ダストからの
純鉄粉回収法。Converter dust generated during converter blowing is collected from converter gas in a non-oxidizing atmosphere, and the collected converter dust is classified.
A method for recovering pure iron powder from converter dust, which is characterized by obtaining high-purity iron powder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16533386A JPS6320403A (en) | 1986-07-14 | 1986-07-14 | Method for recovering pure iron powder from converter dust |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16533386A JPS6320403A (en) | 1986-07-14 | 1986-07-14 | Method for recovering pure iron powder from converter dust |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6320403A true JPS6320403A (en) | 1988-01-28 |
Family
ID=15810339
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16533386A Pending JPS6320403A (en) | 1986-07-14 | 1986-07-14 | Method for recovering pure iron powder from converter dust |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6320403A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01215910A (en) * | 1988-02-23 | 1989-08-29 | Nisshin Steel Co Ltd | Manufacture of iron powder from converter dust |
| WO2010048773A1 (en) * | 2008-10-28 | 2010-05-06 | Dos Santos Victor Loureiro | Magnetic mechanical equipment, method for separating solid particles from each other in dust, system and method for recycling metal component |
-
1986
- 1986-07-14 JP JP16533386A patent/JPS6320403A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01215910A (en) * | 1988-02-23 | 1989-08-29 | Nisshin Steel Co Ltd | Manufacture of iron powder from converter dust |
| WO2010048773A1 (en) * | 2008-10-28 | 2010-05-06 | Dos Santos Victor Loureiro | Magnetic mechanical equipment, method for separating solid particles from each other in dust, system and method for recycling metal component |
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