JP2003147442A - Method and facility for treating waste in ironmaking - Google Patents
Method and facility for treating waste in ironmakingInfo
- Publication number
- JP2003147442A JP2003147442A JP2002149048A JP2002149048A JP2003147442A JP 2003147442 A JP2003147442 A JP 2003147442A JP 2002149048 A JP2002149048 A JP 2002149048A JP 2002149048 A JP2002149048 A JP 2002149048A JP 2003147442 A JP2003147442 A JP 2003147442A
- Authority
- JP
- Japan
- Prior art keywords
- iron
- waste
- carbonaceous material
- making waste
- charging device
- 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.)
- Withdrawn
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
- C22B7/02—Working-up flue dust
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/10—Making spongy iron or liquid steel, by direct processes in hearth-type furnaces
- C21B13/105—Rotary hearth-type furnaces
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/242—Binding; Briquetting ; Granulating with binders
- C22B1/244—Binding; Briquetting ; Granulating with binders organic
- C22B1/245—Binding; Briquetting ; Granulating with binders organic with carbonaceous material for the production of coked agglomerates
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mechanical Engineering (AREA)
- Geochemistry & Mineralogy (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Tunnel Furnaces (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、製鉄所等で発生す
るスケール、スラッジ、ダストなど酸化鉄を含む製鉄廃
棄物を還元処理して、製鋼原料等に再利用することの出
来る処理方法および設備に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a treatment method and equipment capable of reducing ironmaking waste containing iron oxide such as scale, sludge and dust generated in a steelworks and reusing it as a raw material for steelmaking. It is about.
【０００２】[0002]
【従来の技術】製鉄所で発生するスケール、スラッジ、
ダストなど酸化鉄を含む製鉄廃棄物を還元処理して製鋼
原料等に再利用するため、これら製鉄廃棄物にコークス
粉等の固体還元剤を混合し、ペレットやブリケットに成
形して塊成化物とし、還元炉に装入して還元処理するこ
とが、直接還元法として知られている。還元処理には回
転炉床炉等の移動炉床炉が使用される。回転炉床炉で
は、装入した塊成化物を炉床上に載置し、炉床を回転移
動させることで塊成化物を移動させつつ、回転炉床炉内
に配置したバーナーで加熱して還元処理する。2. Description of the Related Art Scale, sludge, and
In order to reduce iron-making wastes containing iron oxides such as dust and reuse them as raw materials for steelmaking, etc., these iron-making wastes are mixed with solid reducing agents such as coke powder and molded into pellets or briquettes to form agglomerates. It is known as a direct reduction method to charge a reduction furnace and perform reduction treatment. A moving hearth furnace such as a rotary hearth furnace is used for the reduction treatment. In the rotary hearth furnace, the charged agglomerates are placed on the hearth, and while moving the agglomerates by rotating the hearth, the burners placed in the rotary hearth furnace heat and reduce the agglomerates. To process.
【０００３】回転炉床炉を使用した酸化鉄の還元処理方
法として、特開平５−１２５４５４号公報には、製鋼工
場で発生する廃棄物に炭素質物質および結合剤を加えて
混合し、さらに水と混合して湿った混合物を成形して塊
成化物とし、これを回転炉床炉にて９００℃で１５分間
乾燥し、１１５０℃で２０〜３０分加熱して還元する方
法が開示されている。As a method for reducing iron oxide using a rotary hearth furnace, Japanese Patent Laid-Open No. 125254/1993 discloses that a carbonaceous substance and a binder are added to and mixed with a waste generated at a steelmaking plant, and then water is added. And a wet mixture is molded to form an agglomerate, which is dried in a rotary hearth furnace at 900 ° C. for 15 minutes and heated at 1150 ° C. for 20 to 30 minutes to reduce. .
【０００４】また特開平８−３３７８２７号公報には、
酸素結合金属および還元剤を含有する混合物を第１層と
して回転炉床炉の上に載置し、炉床を回転させて酸化性
火炎により第１層を加熱し、この第１層を覆うように還
元剤の第２層を供給して加熱し、第２層が炉内で部分的
に還元された混合物の酸化を防止する方法が開示されて
いる。Further, Japanese Patent Laid-Open No. 8-337827 discloses
A mixture containing an oxygen-bonding metal and a reducing agent is placed as a first layer on a rotary hearth furnace, the hearth is rotated, and the first layer is heated by an oxidizing flame to cover the first layer. A method of supplying a second layer of reducing agent to and heating it to prevent oxidation of a mixture in which the second layer is partially reduced in a furnace is disclosed.
【０００５】また特開平１１−３１０８３２号公報に
は、製鋼プラントから発生する廃棄酸化物から鉄、亜鉛
と鉛を分離回収する方法として、乾質廃棄酸化物とスラ
ッジを混合して炭素、鉄、亜鉛、鉛を含む混合物を形成
し、この混合物に１６〜２２重量％の全炭素含有量とな
るように微粒子コークスを添加して塊成化物を成形し、
回転炉床炉内で１０９３℃を超える温度で焼成すること
で鉄酸化物を還元し、亜鉛と鉛を放出させることが開示
されている。Further, Japanese Patent Laid-Open No. 11-310832 discloses a method for separating and recovering iron, zinc and lead from waste oxides generated from a steelmaking plant by mixing dry waste oxides with sludge, carbon, iron, Forming a mixture containing zinc and lead, and adding fine coke to a total carbon content of 16 to 22 wt% to form an agglomerate;
It is disclosed that the iron oxide is reduced and zinc and lead are released by firing at a temperature higher than 1093 ° C. in a rotary hearth furnace.
【０００６】また、特開平１０−２８７９３３号公報に
は、亜鉛含有ダスト単体を減圧下で加熱して酸化鉄と酸
化亜鉛を主体とするダストを得る工程、得られたダスト
に還元剤を混合して減圧下で加熱して亜鉛を還元蒸発さ
せる工程、発生した蒸気亜鉛を真空下で冷却して金属亜
鉛とする方法が開示されている。Further, in Japanese Patent Application Laid-Open No. 10-287933, a step of heating a zinc-containing dust simple substance under a reduced pressure to obtain dust mainly containing iron oxide and zinc oxide, and mixing a reducing agent with the obtained dust A process of heating under reduced pressure to reduce and evaporate zinc, and a method of cooling generated vapor zinc under vacuum to form metallic zinc.
【０００７】[0007]
【発明が解決しようとする課題】一般に製鉄廃棄物に
は、揮発性物質としてＣｌ、Ｐｂ、Ｎａ、Ｋ等が含まれ
ている。Ｐｂ，Ｎａ，Ｋの多くは塩化物（ＰｂＣｌ2 ，
ＮａＣｌ，ＫＣｌ）の形である。これらは１０００℃以
上における飽和蒸気圧が高いため、図１に示すように１
０００℃以上に加熱すると高い割合で揮発する。Generally, iron-making waste contains volatile substances such as Cl, Pb, Na and K. Most of Pb, Na, and K are chlorides (PbCl 2 ,
NaCl, KCl). Since these have high saturated vapor pressure at 1000 ° C or higher, as shown in FIG.
When heated above 000 ° C, it volatilizes at a high rate.
【０００８】Ｚｎの多くは酸化物（ＺｎＯ）の形でダス
ト中に含まれる。ＺｎＯは沸点が高くそのままでは揮発
しにくい。しかし還元材を混入して加熱還元すると、Ｚ
ｎＯ＋Ｃ→Ｚｎ＋ＣＯの反応で金属亜鉛となり、その沸
点が９０３℃のため１０００℃以上では揮発する。Most of Zn is contained in dust in the form of oxide (ZnO). ZnO has a high boiling point and is difficult to volatilize as it is. However, if a reducing agent is mixed in and reduced by heating, Z
The reaction of nO + C → Zn + CO turns into metallic zinc, and since its boiling point is 903 ° C., it volatilizes at 1000 ° C. or higher.
【０００９】したがって、これら揮発性物質を含有する
製鉄廃棄物に還元剤を混練した塊成化物を回転炉床炉に
装入して加熱還元すると、回転炉床炉で発生するダスト
を集塵装置で回収するようにしているので、特開平５−
１２５４５４号公報、特開平８−３３７８２７号公報、
特開平１１−３０１８３２号公報のような従来法では回
収されたダスト中に前記のような揮発性物質が含まれて
いる。Therefore, when the agglomerated product obtained by kneading the iron-making waste containing these volatile substances with a reducing agent is charged into the rotary hearth furnace and heated and reduced, the dust generated in the rotary hearth furnace is a dust collector. Since it is collected at
No. 125454, Japanese Patent Laid-Open No. 8-337827,
In the conventional method as disclosed in Japanese Patent Laid-Open No. 11-301832, the above-mentioned volatile substances are contained in the collected dust.
【００１０】このため、ダストから亜鉛を回収するには
亜鉛から揮発性物質を分離することが必要となり、多大
なコストを要し、亜鉛のリサイクル原単位が高騰してリ
サイクルメリットがなく、逆にリサイクルのために設備
費用が増大するという問題があった。したがって従来
は、製鉄廃棄物のうち揮発性物質の少ないものを再利用
し、塩素などの揮発性物質を多く含むものはリサイクル
することができなかった。Therefore, in order to recover zinc from dust, it is necessary to separate volatile substances from zinc, which requires a great deal of cost, and the unit recycling cost of zinc is soaring that there is no merit for recycling. There was a problem that equipment costs increased due to recycling. Therefore, in the past, it was not possible to reuse iron-making wastes containing a small amount of volatile substances and to recycle iron-containing wastes containing a large amount of volatile substances such as chlorine.
【００１１】一方、特開平１０−２８７９３３号公報に
開示されている方法では、亜鉛含有ダスト単体を加熱し
て酸化鉄と酸化亜鉛を主体とするダストを得る工程、得
られたダストに還元剤を混合して減圧下で加熱して亜鉛
を還元蒸発させる工程とに分けているため、亜鉛と他の
揮発性物質（Ｃｌ，Ｐｂ，Ｎａ，Ｋ等）を分離して回収
することができる。On the other hand, in the method disclosed in Japanese Patent Laid-Open No. 10-287933, a step of heating a zinc-containing dust simple substance to obtain a dust mainly containing iron oxide and zinc oxide, and a reducing agent to the obtained dust. Since it is divided into a step of mixing and heating under reduced pressure to reduce and evaporate zinc, zinc and other volatile substances (Cl, Pb, Na, K, etc.) can be separated and recovered.
【００１２】しかし、この方法では、多段式の炉床が固
定式であり、攪拌アームで炉床上の微粉状の亜鉛含有ダ
ストを攪拌しながら移動させる方式のため、微粉状の亜
鉛含有ダストが舞い上がり、排ガスおよび金属亜鉛蒸気
と共に金属回収装置まで運ばれることで、回収される亜
鉛の純度が低下する問題があった。また、前記攪拌アー
ムが炉内の高温雰囲気に曝されることになり、攪拌アー
ムの高温磨耗、高温腐食、熱歪みが大きく、攪拌アーム
の寿命が短いという問題があった。攪拌アームの水冷も
必要となり、冷却水の抜熱が大きいという問題もあっ
た。さらに、多段床型の炉のため構造が複雑となり、設
備費が高価になるという問題もあった。[0012] However, in this method, since the multi-stage hearth is a fixed type and the stirring arm moves the fine powder zinc-containing dust on the hearth while stirring, the fine powder zinc-containing dust rises up. However, there is a problem in that the purity of the recovered zinc is lowered by being carried to the metal recovery device together with the exhaust gas and the metallic zinc vapor. Further, since the stirring arm is exposed to a high temperature atmosphere in the furnace, there is a problem that high temperature wear, high temperature corrosion and thermal strain of the stirring arm are large and the life of the stirring arm is short. There is also a problem that cooling of the cooling water is large because cooling of the stirring arm also becomes necessary. Further, there is a problem that the structure is complicated and the equipment cost is high because of the multi-stage floor type furnace.
【００１３】そこで本発明が解決しようとする課題は、
製鉄廃棄物を還元処理してリサイクルするにあたり、塩
素などの揮発性物質を多く含むものでもダストから亜鉛
を容易に回収できるようにして、製鉄廃棄物のうち従来
は廃棄せざるをえなかったものでもリサイクルを実現す
ることである。Therefore, the problem to be solved by the present invention is as follows.
When reducing and recycling iron-making waste, it is possible to easily recover zinc from dust even if it contains a large amount of volatile substances such as chlorine. But to realize recycling.
【００１４】[0014]
【課題を解決するための手段】上記課題を解決するため
の本発明法は、製鉄廃棄物を移動炉床炉を用いて還元物
とし排出装置より排出する方法において、前記移動炉床
炉に製鉄廃棄物を装入するための製鉄廃棄物装入装置と
炭材を装入するための炭材装入装置を別々に配設し、製
鉄廃棄物と炭材を前記移動炉床炉内に装入することを特
徴とする製鉄廃棄物の処理方法である。According to the method of the present invention for solving the above-mentioned problems, a method of discharging iron-making waste as a reduction product using a moving hearth furnace and discharging it from an discharging device An iron-making waste charging device for charging waste and a carbon-material charging device for charging carbonaceous material are separately arranged, and the iron-making waste and carbonaceous material are charged into the moving hearth furnace. It is a method of treating iron-making waste, which is characterized in that it is put in.
【００１５】上記本発明法において、前記製鉄廃棄物装
入装置と前記炭材装入装置の間に第１排気口を設け、該
第１排気口より製鉄廃棄物から発生する揮発性ガスを排
出するのが好ましい。また、前記炭材装入装置と前記排
出装置の間に第２排気口を設け、該第２排気口より製鉄
廃棄物と炭材の混合材から発生するガスを排出するのが
好ましい。In the above method of the present invention, a first exhaust port is provided between the iron-making waste charging device and the carbonaceous-material charging device, and volatile gas generated from the iron-making waste is discharged from the first exhaust port. Preferably. Further, it is preferable that a second exhaust port is provided between the carbonaceous material charging device and the exhausting device, and gas generated from the mixed material of iron-making waste and carbonaceous material is exhausted from the second exhaust port.
【００１６】また上記課題を解決するための本発明設備
は、製鉄廃棄物を移動炉床炉を用いて還元物とし排出装
置より排出する設備において、前記移動炉床炉に製鉄廃
棄物を装入するための製鉄廃棄物装入装置と炭材を装入
するための炭材装入装置を所定の間隔をあけて配設した
ことを特徴とする製鉄廃棄物の処理設備である。Further, the equipment of the present invention for solving the above-mentioned problems is an equipment for discharging iron-making waste into a reduced product by using a moving hearth furnace and discharging the iron-making waste into the moving hearth furnace. The apparatus for treating iron-making waste is characterized in that an iron-making waste charging device for charging and a carbon-material charging device for charging carbonaceous material are arranged at a predetermined interval.
【００１７】上記本発明設備において、前記製鉄廃棄物
装入装置と前記炭材装入装置の間に、製鉄廃棄物から発
生する揮発性ガスを排出するための第１排気口を設ける
のが好ましい。また、前記炭材装入装置と前記排出装置
の間に、製鉄廃棄物と炭材の混合材から発生するガスを
排出するための第２排気口を設けるのが好ましい。さら
に、前記炭材装入装置の後に、製鉄廃棄物と炭材を移動
炉床炉内で混合するための混合装置を設けるのが好まし
い。In the above facility of the present invention, it is preferable that a first exhaust port for discharging a volatile gas generated from the ironmaking waste is provided between the ironmaking waste charging device and the carbonaceous material charging device. . Further, it is preferable to provide a second exhaust port between the carbonaceous material charging device and the discharging device for discharging gas generated from the mixed material of iron-making waste and carbonaceous material. Further, it is preferable to provide a mixing device for mixing the iron-making waste and the carbonaceous material in the moving hearth furnace after the carbonaceous material charging device.
【００１８】さらに、前記混合装置の後に、製鋼廃棄物
と炭材の混合物を圧下する圧下装置を設けることが好ま
しい。さらに、前記炭材装入装置、前記混合装置および
前記圧下装置のいずれか、またはこれらの２以上の装置
において、これらの装置を取り付ける部位の天井を、他
の部位より低くすることが好ましい。または、前記炭材
装入装置、前記混合装置および前記圧下装置のいずれ
か、またはこれらの２以上の装置において、これらの装
置を取り付ける部位の前後に隔壁を設け、その隔壁と炉
床の間に隙間を設けることが好ましい。Further, it is preferable to provide a rolling down device for rolling down the mixture of the steelmaking waste and the carbonaceous material after the mixing device. Further, in any one of the carbonaceous material charging device, the mixing device, and the pressure reducing device, or in two or more of these devices, it is preferable that the ceiling of the part to which these devices are attached is lower than the other parts. Alternatively, in any of the carbonaceous material charging device, the mixing device, and the reduction device, or in two or more of these devices, partition walls are provided before and after a portion to which these devices are attached, and a gap is provided between the partition wall and the hearth. It is preferable to provide.
【００１９】[0019]
【発明の実施の形態】本発明は図４のような回転炉床炉
１等の移動炉床炉に製鉄鉄廃棄物装入装置２と炭材装入
装置６を別々に配設し、まず製鉄廃棄物を炭材と混合す
る前に加熱し、Ｐｂ，Ｎａ，Ｋ等を塩化物の状態で揮発
させた後に、製鉄廃棄物と炭材を混合装置７等により回
転炉床炉１内にて混合し、還元反応：ＺｎＯ＋Ｃ→Ｚｎ
＋ＣＯにより、Ｚｎを金属亜鉛の状態で揮発させるもの
である。炉床は矢印の方向に回転し、装入された製鉄廃
棄物と炭材は炉床に載置されて移動しつつ混合され、加
熱還元されて排出装置１９から排出される。BEST MODE FOR CARRYING OUT THE INVENTION According to the present invention, a moving iron hearth furnace such as a rotary hearth furnace 1 as shown in FIG. The ironmaking waste is heated before being mixed with the carbonaceous material, and Pb, Na, K, etc. are volatilized in a chloride state, and then the ironmaking waste and the carbonaceous material are mixed into the rotary hearth furnace 1 by the mixing device 7 or the like. And mix and reduce reaction: ZnO + C → Zn
By + CO, Zn is volatilized in the state of metallic zinc. The hearth rotates in the direction of the arrow, and the charged ironmaking waste and carbonaceous material are placed on the hearth and mixed while moving, heated and reduced, and discharged from the discharge device 19.
【００２０】回転炉床炉１の周方向断面の例を図２に展
開図で示す。本例では、製鉄廃棄物装入装置２から装入
された製鉄廃棄物３は第１燃焼装置９で加熱されたの
ち、炭材装入装置６から装入された炭材５と混合装置７
により混合され、混合材１１が圧下装置２０で圧下さ
れ、第２燃焼装置１０で加熱還元され、排出装置１９か
ら還元物１２が排出される。図３は既存の回転炉床炉１
の燃焼装置を、第１燃焼装置９と第２燃焼装置１０に、
隔離壁１３で分割し、２枚の隔離壁１３の間に炭材装入
装置６と混合装置７および圧下装置２０を配設した例で
ある。An example of a circumferential cross section of the rotary hearth furnace 1 is shown in a developed view in FIG. In this example, the ironmaking waste 3 charged from the ironmaking waste charging device 2 is heated by the first combustion device 9, and then the carbonaceous material 5 charged from the carbonaceous material charging device 6 and the mixing device 7 are charged.
The mixed material 11 is reduced by the reduction device 20, heated and reduced by the second combustion device 10, and the reduced material 12 is discharged from the discharge device 19. Figure 3 shows the existing rotary hearth furnace 1
To the first combustion device 9 and the second combustion device 10,
This is an example in which the partition wall 13 is divided and the carbonaceous material charging device 6, the mixing device 7, and the reduction device 20 are disposed between the two partition walls 13.
【００２１】混合装置７で製鉄廃棄物２と炭材５を混合
するのは、製鉄廃棄物中の酸化亜鉛と炭材中の炭素を緊
密に接触させることで、還元反応を促進することが目的
である。ロール状の圧下装置２０で混合材１１を圧下す
るのは、製鉄廃棄物中の酸化亜鉛と炭材中の炭素を緊密
に接触させることで、還元反応を促進することが目的で
ある。The purpose of mixing the ironmaking waste 2 and the carbonaceous material 5 with the mixing device 7 is to promote the reduction reaction by bringing zinc oxide in the ironmaking waste into close contact with carbon in the carbonaceous material. Is. The purpose of pressing down the mixed material 11 with the roll-shaped pressing device 20 is to promote the reduction reaction by bringing zinc oxide in the iron-making waste into close contact with carbon in the carbonaceous material.
【００２２】図２〜図４のような回転炉床炉１におい
て、製鉄廃棄物装入装置２と炭材装入装置６の間に、製
鉄廃棄物３から発生する揮発性ガスを排出するための第
１排気口４を設けるのが好ましく、また炭材装入装置６
と排出装置１９の間に、製鉄廃棄物３と炭材５の混合材
１１から発生するガスを排出するための第２排気口８を
設けるのが好ましい。第１排気口４と第２排気口８は、
それぞれ別々のガス冷却装置および集塵装置に連通され
る。In the rotary hearth furnace 1 as shown in FIGS. 2 to 4, for discharging the volatile gas generated from the ironmaking waste 3 between the ironmaking waste charging device 2 and the carbonaceous material charging device 6. It is preferable to provide the first exhaust port 4 of the
It is preferable to provide a second exhaust port 8 for exhausting the gas generated from the mixed material 11 of the ironmaking waste 3 and the carbonaceous material 5 between the exhaust device 19 and the exhaust device 19. The first exhaust port 4 and the second exhaust port 8 are
Each is connected to a separate gas cooler and dust collector.
【００２３】製鉄廃棄物３として、従来からリサイクル
処理に使用されていた揮発性物質含有量の少ないものを
使用する場合は、上記第１排気口４を特に設けず、通常
の排気口や第２排気口８があればよい。しかし揮発性物
質を多く含有する製鉄廃棄物を使用する場合、第１排気
口４を設け、製鉄廃棄物３を第１燃焼装置９で加熱した
ときに発生する揮発性物質を除去する。When the iron waste 3 having a small content of volatile substances, which has been conventionally used in the recycling process, is used, the first exhaust port 4 is not provided and the normal exhaust port and the second exhaust port are not provided. It suffices if the exhaust port 8 is provided. However, when using the ironmaking waste containing a large amount of volatile substances, the first exhaust port 4 is provided to remove the volatile substances generated when the ironmaking waste 3 is heated by the first combustion device 9.
【００２４】第１排気口４から揮発性物質を除去した
後、炭材５との混合材１１を第２燃焼装置１０にて加熱
還元する。このときの排気は通常の排気口から行うこと
もできるが、図示のように炭材装入装置６と排出装置１
９の間に第２排気口８を設けることで、第２排気口８か
ら亜鉛を高純度の酸化亜鉛の形で効果的に回収すること
ができる。After removing the volatile substances from the first exhaust port 4, the mixed material 11 with the carbonaceous material 5 is heated and reduced by the second combustion device 10. Although the exhaust at this time can be performed from a normal exhaust port, as shown in the figure, the carbonaceous material charging device 6 and the discharging device 1
By providing the second exhaust port 8 between 9 and 9, zinc can be effectively recovered from the second exhaust port 8 in the form of high-purity zinc oxide.
【００２５】Ｐｂ，Ｎａ，Ｋの多くは塩化物（ＰｂＣｌ
2 ，ＮａＣｌ，ＫＣｌ）であり、第１燃焼装置９では、
炭材を混合する前に約１０５０から１２５０℃で製鉄廃
棄物３を加熱することにより、亜鉛をほとんど蒸発させ
ず、Ｃｌ、Ｐｂ、Ｎａ、Ｋなどの有害物質を第１排気口
４から揮発除去することができる。１２５０℃以下とし
たのは、図１のように１２００℃で十分に高い揮発率が
得られ、１２５０℃超に加熱しても熱ロスや耐火物の損
耗が増すだけであり、１０５０℃より低いと揮発率が低
いからである。Most of Pb, Na and K are chlorides (PbCl
2 , NaCl, KCl), and in the first combustion device 9,
By heating the ironmaking waste 3 at about 1050 to 1250 ° C. before mixing the carbonaceous material, zinc is hardly evaporated, and harmful substances such as Cl, Pb, Na and K are volatilized and removed from the first exhaust port 4. can do. The temperature of 1250 ° C or lower is lower than 1050 ° C, because a sufficiently high volatilization rate is obtained at 1200 ° C as shown in Fig. 1, and even if it is heated to more than 1250 ° C, heat loss and wear of refractories are increased. And the low volatility.
【００２６】第２燃焼装置１０では、比較的高温の酸化
鉄還元領域で炭材５との混合材１１を加熱し、還元物と
する。このとき製鉄廃棄物３中の酸化亜鉛などが還元さ
れ金属亜鉛の蒸気として揮発し第２排気口８から吸引さ
れて、炉内およびダクト内の排ガス中の酸素により再酸
化されて、高純度の酸化亜鉛が回収される。In the second combustion apparatus 10, the mixed material 11 with the carbonaceous material 5 is heated in the iron oxide reduction region at a relatively high temperature to form a reduced product. At this time, zinc oxide or the like in the ironmaking waste 3 is reduced and volatilized as a vapor of metallic zinc, sucked from the second exhaust port 8 and reoxidized by oxygen in the exhaust gas in the furnace and the duct to obtain high purity. Zinc oxide is recovered.
【００２７】また本発明において、第１燃焼装置９と第
２燃焼装置１０の間を、図２のような低い天井とし、あ
るいは図３のように間に隔離壁１３を設けることで、第
２排気口８から揮発性物質や炭材５が吸引されるのを防
止することができ、より高純度の亜鉛を回収できる。図
３のように第２排気口側８の隔離壁の下端を第１排気口
側４の隔離壁の下端より低くすると、前記効果はさらに
向上する。Further, in the present invention, a low ceiling as shown in FIG. 2 is provided between the first combustion device 9 and the second combustion device 10, or an isolation wall 13 is provided as shown in FIG. It is possible to prevent the volatile substance and the carbonaceous material 5 from being sucked from the exhaust port 8, and it is possible to recover zinc of higher purity. When the lower end of the isolation wall on the second exhaust port side 8 is made lower than the lower end of the isolation wall on the first exhaust port side 4 as shown in FIG. 3, the above effect is further improved.
【００２８】さらに本発明において、図３のように混合
装置７と第１燃焼装置９の間、および／または第２燃焼
装置１０の間に隔離壁１３を設けることで、混合時に炉
内に舞い上がる製鉄廃棄物３、炭材５、あるいは混合材
１１が第１排気口４および／または第２排気口８から吸
引されて、回収亜鉛の純度が低下したり、集塵装置の負
荷が増大するといった問題が生じず、さらには混合装置
７の熱負荷が低減する。Further, in the present invention, as shown in FIG. 3, by providing a partition wall 13 between the mixing device 7 and the first combustion device 9 and / or between the second combustion device 10, the partition wall 13 rises up into the furnace during mixing. The iron-making waste 3, the carbonaceous material 5, or the mixed material 11 is sucked from the first exhaust port 4 and / or the second exhaust port 8 to lower the purity of the recovered zinc or increase the load of the dust collector. No problems occur, and the heat load on the mixing device 7 is reduced.
【００２９】次に本発明における混合装置７の具体例を
示す。図５は回転炉床炉１の回転方向から見た断面図で
あり、両炉壁側で軸支された軸１６に羽根１４，１５が
取付けられ、各羽根１４，１５には開口１７が設けてあ
る。羽根１４，１５は図６のように互いにほぼ垂直にず
らして軸１６に固定してあり、先端が鉤型になってい
る。その形状は図７および図８の斜視図に示すとおりで
ある。軸１６を図６のように回転させることで、製鉄廃
棄物３と炭材５が効果的に混合されて混合材１１とな
る。Next, a specific example of the mixing device 7 in the present invention will be shown. FIG. 5 is a cross-sectional view of the rotary hearth furnace 1 as seen from the rotation direction. Blades 14 and 15 are attached to a shaft 16 that is supported on both furnace wall sides, and openings 17 are provided in each blade 14 and 15. There is. As shown in FIG. 6, the blades 14 and 15 are offset from each other substantially perpendicularly and fixed to the shaft 16, and the tips thereof are hook-shaped. Its shape is as shown in the perspective views of FIGS. 7 and 8. By rotating the shaft 16 as shown in FIG. 6, the ironmaking waste 3 and the carbonaceous material 5 are effectively mixed to form the mixed material 11.
【００３０】図９には混合板１８を採用した例を示す。
混合板１８は、図１０および図１１に示すように、上部
に凹凸が形成されていて、図９のように凹部から製鉄廃
棄物３と炭材５が落下することで両者が混合し、混合材
１１となる。混合板１８は、図９のように適正な角度に
傾斜させて固定してもよく、あるいは傾斜させた状態で
振動させてもよい。FIG. 9 shows an example in which the mixing plate 18 is adopted.
As shown in FIGS. 10 and 11, the mixing plate 18 has irregularities formed on the upper portion thereof, and as shown in FIG. 9, the iron waste 3 and the carbonaceous material 5 are dropped from the recesses to mix and mix them. It becomes the material 11. The mixing plate 18 may be tilted and fixed at an appropriate angle as shown in FIG. 9, or may be vibrated while being tilted.
【００３１】[0031]
【発明の効果】以上のように、本発明によれば、スケー
ル、スラッジ、ダストなどの酸化鉄等を含む製鉄廃棄物
を還元処理して製鋼原料などにリサイクルするにあた
り、塩素などの揮発性物質を多く含むものでもダストか
ら亜鉛を容易に回収できるようにして、製鉄廃棄物のう
ち従来は廃棄せざるをえなかったものでも広くリサイク
ルを実現することができる。したがって資源の有効活
用、廃棄物の減少など、環境面およびコスト面で多大な
効果がもたらされる。As described above, according to the present invention, volatile substances such as chlorine are used in the reduction treatment of ironmaking waste including iron oxides such as scale, sludge, and dust to be recycled into steelmaking raw materials. It is possible to easily recover zinc from dust even if it contains a large amount of iron, and it is possible to widely recycle iron-making waste that has conventionally been forced to be discarded. Therefore, there are great environmental and cost effects such as effective use of resources and reduction of waste.
【図１】本発明対象の製鉄廃棄物に含まれる特定元素の
特性を示すグラフである。FIG. 1 is a graph showing the characteristics of a specific element contained in the iron-making waste of the present invention.
【図２】本発明例を示す回転炉床炉の周方向断面展開図
である。FIG. 2 is a circumferential sectional development view of a rotary hearth furnace showing an example of the present invention.
【図３】本発明の別の例を示す回転炉床炉の周方向断面
展開図である。FIG. 3 is a circumferential sectional development view of a rotary hearth furnace showing another example of the present invention.
【図４】本発明の対象例である回転炉床炉の例を示す斜
視図である。FIG. 4 is a perspective view showing an example of a rotary hearth furnace which is an object example of the present invention.
【図５】本発明における混合装置の例を示す断面図であ
る。FIG. 5 is a sectional view showing an example of a mixing device according to the present invention.
【図６】本発明における混合装置の例を示し、図５のＡ
−Ａ矢視断面図である。FIG. 6 shows an example of a mixing device according to the present invention, which is shown in FIG.
FIG. 7 is a cross-sectional view taken along arrow A.
【図７】本発明における混合装置の例を示し、図５のＢ
−Ｂ矢視斜視断面図である。FIG. 7 shows an example of a mixing device according to the present invention, which is indicated by B in FIG.
FIG. 6 is a perspective cross-sectional view taken along arrow B.
【図８】本発明における混合装置の例を示し、図５のＣ
−Ｃ矢視斜視断面図である。FIG. 8 shows an example of a mixing device according to the present invention, which is represented by C in FIG.
FIG. 6 is a perspective sectional view taken along the arrow C.
【図９】本発明における混合装置の別の例を示す断面図
である。FIG. 9 is a cross-sectional view showing another example of the mixing device according to the present invention.
【図１０】本発明における混合装置の別の例を示し、図
９の正面図である。FIG. 10 is a front view of FIG. 9 showing another example of the mixing device according to the present invention.
【図１１】本発明における混合装置の別の例を示し、図
９の斜視図である。FIG. 11 is a perspective view of FIG. 9 showing another example of the mixing device of the present invention.
１：回転炉床炉 ２：製鉄廃棄物装入装置 ３：製鉄廃棄物 ４：第１排気口 ５：炭材 ６：炭材装入装置 ７：混合装置 ８：第２排気口 ９：第１燃焼装置 １０：第２燃焼装置 １１：混合材 １２：還元物 １３：隔離壁 １４，１５：羽根 １６：軸 １７：開口 １８：混合板 １９：排出装置 ２０：圧下装置 1: Rotary hearth furnace 2: Iron waste disposal device 3: Steelmaking waste 4: First exhaust port 5: Carbon material 6: Carbon material charging device 7: Mixing device 8: Second exhaust port 9: First combustion device 10: Second combustion device 11: Mixed material 12: Reduced product 13: Isolation wall 14, 15: Feather 16: axis 17: opening 18: Mixing plate 19: Ejector 20: Reduction device
───────────────────────────────────────────────────── フロントページの続き Ｆターム(参考） 4K001 AA10 BA14 BA15 BA24 CA49 DA00 GA00 GB01 GB02 GB05 GB09 HA00 HA01 4K050 AA04 BA02 CA09 CA13 CF01 DA06 ─────────────────────────────────────────────────── ─── Continued front page F-term (reference) 4K001 AA10 BA14 BA15 BA24 CA49 DA00 GA00 GB01 GB02 GB05 GB09 HA00 HA01 4K050 AA04 BA02 CA09 CA13 CF01 DA06
Claims (10)
とし排出装置より排出する方法において、前記移動炉床
炉に製鉄廃棄物を装入するための製鉄廃棄物装入装置と
炭材を装入するための炭材装入装置を別々に配設し、製
鉄廃棄物と炭材を前記移動炉床炉内に装入することを特
徴とする製鉄廃棄物の処理方法。1. A method for discharging iron-making waste into a reduced product by using a moving hearth furnace and discharging the iron-making waste from an discharging device, wherein the iron-making waste charging device and charcoal for charging the iron-making waste into the moving hearth furnace. A method for treating iron-making waste, comprising separately disposing carbonaceous material charging devices for charging the material, and charging the iron-making waste and the carbonaceous material into the moving hearth furnace.
装置の間に第１排気口を設け、該第１排気口より製鉄廃
棄物から発生する揮発性ガスを排出することを特徴とす
る請求項１に記載の製鉄廃棄物の処理方法。2. A first exhaust port is provided between the iron-making waste charging device and the carbonaceous-material charging device, and volatile gas generated from the iron-making waste is discharged from the first exhaust port. The method for treating iron waste according to claim 1.
第２排気口を設け、該第２排気口より製鉄廃棄物と炭材
の混合材から発生するガスを排出することを特徴とする
請求項１または２に記載の製鉄廃棄物の処理方法。3. A second exhaust port is provided between the carbonaceous material charging device and the discharge device, and gas generated from a mixture of iron waste and carbonaceous material is discharged from the second exhaust port. The method for treating iron waste according to claim 1 or 2.
とし排出装置より排出する設備において、前記移動炉床
炉に製鉄廃棄物を装入するための製鉄廃棄物装入装置と
炭材を装入するための炭材装入装置を所定の間隔をあけ
て配設したことを特徴とする製鉄廃棄物の処理設備。4. A facility for discharging iron-making waste into a reduced product by using a moving hearth furnace and discharging the iron-making waste from the discharging device, and an iron-making waste charging device and charcoal for charging the iron-making waste into the moving hearth furnace. A treatment facility for iron-making waste, characterized in that carbonaceous material charging devices for charging the material are arranged at predetermined intervals.
装置の間に、製鉄廃棄物から発生する揮発性ガスを排出
するための第１排気口を設けたことを特徴とする請求項
４に記載の製鉄廃棄物の処理設備。5. A first exhaust port for discharging a volatile gas generated from the ironmaking waste is provided between the ironmaking waste charging device and the carbonaceous material charging device. Item 4. The facility for processing iron-making waste according to item 4.
に、製鉄廃棄物と炭材の混合材から発生するガスを排出
するための第２排気口を設けたことを特徴とする請求項
４または５に記載の製鉄廃棄物の処理設備。6. A second exhaust port is provided between the carbonaceous material charging device and the discharge device for discharging gas generated from a mixed material of iron-making waste and carbonaceous material. Item 4. The facility for treating iron waste according to item 4 or 5.
炭材を移動炉床炉内で混合するための混合装置を設けた
ことを特徴とする請求項４から６のいずれか１項に記載
の製鉄廃棄物の処理設備。7. A mixing device for mixing iron-making waste and carbonaceous material in a moving hearth furnace is provided after the carbonaceous material charging device. Iron processing waste treatment equipment according to paragraph.
の混合物を圧下する圧下装置を設けたことを特徴とする
請求項４から７のいずれか１項に記載の製鉄廃棄物の処
理設備。8. The processing of iron-making waste according to claim 4, further comprising a reduction device for reducing the mixture of steel-making waste and carbonaceous material after the mixing device. Facility.
前記圧下装置のいずれか、または２以上の装置におい
て、これらを取り付ける部位の天井を、他の部位より低
くすることを特徴とする請求項４から８のいずれか１項
に記載の製鉄廃棄物の処理設備。9. The carbonaceous material charging device, the mixing device, and the reduction device, or in two or more devices, the ceiling of the part to which these are attached is lower than the other parts. Item 9. The facility for treating iron waste according to any one of items 4 to 8.
び前記圧下装置のいずれか、または２以上の装置におい
て、これらを取り付ける部位の前後に隔壁を設け、その
隔壁と炉床の間に隙間を設けることを特徴とする請求項
４から９のいずれか１項に記載の製鉄廃棄物の処理設
備。10. The carbonaceous material charging device, the mixing device, and the reduction device, or in two or more devices, a partition wall is provided before and after a portion to which these are attached, and a gap is provided between the partition wall and the hearth. The iron-making waste treatment facility according to any one of claims 4 to 9, characterized in that.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002149048A JP2003147442A (en) | 2001-09-03 | 2002-05-23 | Method and facility for treating waste in ironmaking |
| PCT/JP2002/008885 WO2003020987A1 (en) | 2001-09-03 | 2002-09-02 | Method of treating steelmaking waste, and movable hearth furnace therefor |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001266152 | 2001-09-03 | ||
| JP2001-266152 | 2001-09-03 | ||
| JP2002149048A JP2003147442A (en) | 2001-09-03 | 2002-05-23 | Method and facility for treating waste in ironmaking |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2003147442A true JP2003147442A (en) | 2003-05-21 |
Family
ID=26621548
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2002149048A Withdrawn JP2003147442A (en) | 2001-09-03 | 2002-05-23 | Method and facility for treating waste in ironmaking |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2003147442A (en) |
| WO (1) | WO2003020987A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1481831A1 (en) | 2003-05-26 | 2004-12-01 | Toyoda Gosei Co., Ltd. | Glass run for motor vehicle |
| CN101893387A (en) * | 2010-07-20 | 2010-11-24 | 中冶赛迪工程技术股份有限公司 | Process for processing smoke |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5186741A (en) * | 1991-04-12 | 1993-02-16 | Zia Patent Company | Direct reduction process in a rotary hearth furnace |
| US6120577A (en) * | 1998-03-25 | 2000-09-19 | Ltv Steel Company, Inc. | Treatment of steel mill waste metal oxides |
| JP2002249813A (en) * | 2001-02-21 | 2002-09-06 | Kobe Steel Ltd | Rotary hearth type reducing furnace operating method |
-
2002
- 2002-05-23 JP JP2002149048A patent/JP2003147442A/en not_active Withdrawn
- 2002-09-02 WO PCT/JP2002/008885 patent/WO2003020987A1/en active Application Filing
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1481831A1 (en) | 2003-05-26 | 2004-12-01 | Toyoda Gosei Co., Ltd. | Glass run for motor vehicle |
| CN101893387A (en) * | 2010-07-20 | 2010-11-24 | 中冶赛迪工程技术股份有限公司 | Process for processing smoke |
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| Publication number | Publication date |
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| WO2003020987A1 (en) | 2003-03-13 |
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