JP2003342649A - Process for operating rotary kiln used for reducing iron and steel dust - Google Patents
Process for operating rotary kiln used for reducing iron and steel dustInfo
- Publication number
- JP2003342649A JP2003342649A JP2002157309A JP2002157309A JP2003342649A JP 2003342649 A JP2003342649 A JP 2003342649A JP 2002157309 A JP2002157309 A JP 2002157309A JP 2002157309 A JP2002157309 A JP 2002157309A JP 2003342649 A JP2003342649 A JP 2003342649A
- Authority
- JP
- Japan
- Prior art keywords
- zinc
- steel dust
- rotary kiln
- lime
- reducing agent
- 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
Classifications
-
- 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
- Manufacture And Refinement Of Metals (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、少なくとも鉄と亜
鉛を含有する鉄鋼ダストを炭素質還元剤によって還元焙
焼して亜鉛を回収する鉄鋼ダスト還元ロータリーキルン
の操業方法に関し、特に、亜鉛揮発率を向上させる方法
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for operating a steel dust reduction rotary kiln for reducing and roasting steel dust containing at least iron and zinc with a carbonaceous reducing agent to recover zinc. Regarding how to improve.
【０００２】[0002]
【従来の技術】鉄スクラップなどを電気炉などの製鋼炉
で処理する際に発生する鉄鋼ダストは、鉄以外に多量の
亜鉛とその他、少量の有価金属を含有している。2. Description of the Related Art Iron and steel dust generated when processing scrap iron or the like in a steelmaking furnace such as an electric furnace contains a large amount of zinc in addition to iron and a small amount of valuable metals.
【０００３】そのため、資源リサイクルの対象として、
鉄鋼ダストから主に亜鉛を回収している。亜鉛の回収法
としては、ロータリーキルンによる還元焙焼法を採用す
るのが一般的である（例えば、特開平７−１１３５４、
特開平１０−２１２５３１、特開平１０−２２６８２
９、特開２０００−２２６６２０）。Therefore, as a target of resource recycling,
Zinc is mainly recovered from steel dust. As a zinc recovery method, a reduction roasting method using a rotary kiln is generally adopted (for example, JP-A-7-11354,
JP-A-10-212531 and JP-A-10-22682
9, JP 2000-226620).
【０００４】この還元焙焼法においては、鉄鋼ダストは
必要に応じて予め適当な大きさのペレットに成形され、
石炭またはコークス等の炭素質還元剤とともに、ロータ
リーキルンに連続的に装入される。ロータリーキルン内
は、最高温度が１１００〜１２００℃になるように加熱
されており、鉄鋼ダストはフラックス無しで還元焙焼さ
れる。ここで揮発した金属亜鉛蒸気は、ロータリーキル
ン内で再酸化されて、粉体状酸化亜鉛となり、排ガスと
ともに集塵機に導入され、粗酸化亜鉛として回収され
る。回収された粗酸化亜鉛の多くは、その後、亜鉛製錬
所に送られて、亜鉛地金となる。一方、揮発せずにロー
タリーキルン中に残った残渣は、還元鉄ペレットとして
キルン端より回収される。このような還元焙焼法におけ
る亜鉛揮発率は、通常８０〜９０％である。In this reduction roasting method, steel dust is preformed into pellets of an appropriate size, if necessary,
It is continuously charged into a rotary kiln together with a carbonaceous reducing agent such as coal or coke. The inside of the rotary kiln is heated so that the maximum temperature becomes 1100 to 1200 ° C., and the iron and steel dust is reduced and roasted without flux. The metal zinc vapor volatilized here is reoxidized in the rotary kiln to become powdery zinc oxide, which is introduced into the dust collector together with the exhaust gas and recovered as crude zinc oxide. Much of the recovered crude zinc oxide is then sent to a zinc smelter to become zinc ingot. On the other hand, the residue remaining in the rotary kiln without being volatilized is recovered from the kiln end as reduced iron pellets. The zinc volatilization rate in such a reduction roasting method is usually 80 to 90%.
【０００５】亜鉛揮発率を更に向上する方法の一つは、
還元焙焼温度を高くすることである。しかし、高収率を
得るために１３００℃などという温度まで高くすると、
還元焙焼による反応生成物が軟化・溶融して、ロータリ
ーキルン内壁に付着し、操業時間の経過とともに付着物
が内壁においてリング状に成長し増大する。その結果、
鉄鋼ダストなどの原料がキルン内を移動する際に、付着
物が障害物となり、遂には操業の停止に至ってしまうと
いう欠点がある。One of the methods for further improving the zinc volatility is as follows.
To increase the reduction roasting temperature. However, in order to obtain a high yield, if the temperature is raised to 1300 ° C, etc.,
The reaction product from reduction roasting softens and melts and adheres to the inner wall of the rotary kiln, and the adhered substance grows in a ring shape on the inner wall and increases with the passage of operating time. as a result,
When raw materials such as steel dust move in the kiln, there is a drawback that the deposits become obstacles and eventually stop the operation.
【０００６】[0006]
【発明が解決しようとする課題】そこで本発明は、鉄鋼
ダストの還元焙焼操業において、還元焙焼温度を通常の
温度以上に高くすることなく、亜鉛揮発率を向上するこ
とが可能な方法を提供することを課題とする。Therefore, the present invention provides a method capable of improving the zinc volatilization rate in a reducing roasting operation of iron and steel dust without increasing the reducing roasting temperature above a normal temperature. The challenge is to provide.
【０００７】[0007]
【課題を解決するための手段】本発明の鉄鋼ダスト還元
ロータリーキルンの操業方法は、亜鉛を含有する鉄鋼ダ
ストに炭素質還元剤および石灰分を添加して行う還元焙
焼により、亜鉛を揮発回収する操業方法であって、前記
石灰分が、前記炭素質還元剤に対して、ＣａＯ換算で
０．０３以上の質量比である。A method for operating a rotary duster for reducing iron and steel dust according to the present invention volatilizes and recovers zinc by reducing roasting by adding a carbonaceous reducing agent and a lime component to steel dust containing zinc. In the operating method, the lime content is 0.03 or more in mass ratio in terms of CaO with respect to the carbonaceous reducing agent.
【０００８】石灰分が、炭素質還元剤に対して、ＣａＯ
換算で０．１５以上の質量比であることが好ましい。[0008] The lime content is CaO with respect to the carbonaceous reducing agent.
It is preferable that the mass ratio is 0.15 or more in terms of conversion.
【０００９】[0009]
【発明の実施の形態】鉄鋼ダスト中において、亜鉛は酸
化亜鉛（ＺｎＯ）の形態で存在する。この酸化亜鉛が、
還元焙焼操業過程において、どのような反応にあずかっ
て金属亜鉛蒸気となるかを説明する。DETAILED DESCRIPTION OF THE INVENTION In steel dust, zinc is present in the form of zinc oxide (ZnO). This zinc oxide
The reaction involved in the reduction roasting operation process to form metallic zinc vapor will be described.
【００１０】まず、石炭あるいはコークス等の炭素質還
元剤は、ロータリーキルン炉内ガス中の二酸化炭素（Ｃ
Ｏ2）と反応して一酸化炭素（ＣＯ）を生成する。この
反応をブードワ反応といい、このブードワ反応を式で表
すとＣ＋ＣＯ2＝２ＣＯとなる。鉄鋼ダスト中のＺｎＯ
は、主にこのＣＯガスによって還元され、金属亜鉛蒸気
になると考えられる。First, the carbonaceous reducing agent such as coal or coke is carbon dioxide (C) in the gas in the rotary kiln furnace.
Reacts with O 2 ) to form carbon monoxide (CO). This reaction is called the Boudwar reaction, and this Boudwa reaction is expressed by the formula: C + CO 2 = 2CO. ZnO in steel dust
Is thought to be reduced mainly by this CO gas to metallic zinc vapor.
【００１１】本発明に係る石灰分とは、ＣａＣＯ3を主
成分とする石灰石あるいは石灰石を処理して得られるラ
イム（ＣａＯ）のことであるが、これらの石灰分には、
炭素質還元剤とともに添加されることにより、ロータリ
ーキルンの内部においてブードワ反応を促進させる触媒
作用のあることが、本発明者らの研究により明らかとな
った。ブードワ反応は、進めば進むほどＣＯガスの発生
量が増加するために、ＺｎＯの還元揮発量を増加させる
ことになる。The lime component according to the present invention means limestone containing CaCO 3 as a main component or lime (CaO) obtained by treating limestone.
The studies by the present inventors have revealed that the addition of a carbonaceous reducing agent has a catalytic action for promoting the Boudwa reaction inside the rotary kiln. Since the amount of CO gas generated increases as the Boudouer reaction proceeds, the amount of reduced volatilization of ZnO increases.
【００１２】ここで、ブードワ反応が促進される高温に
おいては、ＣａＣＯ3はＣａＯに分解されるので、触媒
反応を示すのはＣａＯであると考えられる。そこで、添
加される石灰分は、ＣａＯに換算した量を用いることと
する。石灰分は、添加される炭素質還元剤の量に対し
て、ＣａＯに換算した質量比で０．０３以上を添加しな
ければ、ブードワ反応の促進効果が小さく、亜鉛揮発率
の向上はあまり期待できない。石灰分の添加量を増やせ
ば増やすほど、亜鉛揮発率は向上するので、添加量の上
限値は特に設けないが、質量比で０．４０も添加すれ
ば、亜鉛揮発率は１００％近くになるので、それ以上に
石灰分を増やす必要はない。At a high temperature where the Boudwa reaction is promoted, CaCO 3 is decomposed into CaO, and it is considered that CaO exhibits a catalytic reaction. Therefore, as the added lime component, the amount converted to CaO is used. With respect to the amount of lime, unless the amount of the carbonaceous reducing agent to be added is 0.03 or more in terms of mass ratio converted to CaO, the Boudwa reaction accelerating effect is small and the zinc volatilization rate is expected to improve much. Can not. The higher the amount of lime added, the higher the zinc volatilization rate, so the upper limit of the amount added is not set, but if 0.40 is added by mass ratio, the zinc volatilization rate will be close to 100%. Therefore, it is not necessary to increase the lime content further.
【００１３】[0013]
【実施例】表１に、鉄鋼ダストＡ、Ｂとして示した二種
類の成分の異なる鉄鋼ダスト（異なる２つの鉄鋼メーカ
ーで発生したもの）について、実験室的規模の還元焙焼
を実施し、亜鉛揮発率におよぼす石灰分添加の効果を調
査した。[Examples] In Table 1, two types of steel dust having different components shown as steel dusts A and B (those generated by two different steel makers) were subjected to laboratory-scale reduction roasting to obtain zinc. The effect of lime addition on the volatility was investigated.
【００１４】鉄鋼ダストＡは、亜鉛量が多い鉄鋼ダスト
であり、鉄鋼ダストＢは、亜鉛量が標準的な鉄鋼ダスト
である。The steel dust A is a steel dust containing a large amount of zinc, and the steel dust B is a steel dust containing a standard amount of zinc.
【００１５】[0015]
【表１】 [Table 1]
【００１６】（実施例１）鉄鋼ダストＡを１ｋｇ使用し
た。(Example 1) 1 kg of steel dust A was used.
【００１７】なお、鉄鋼ダストＡは、試験炉である回転
焙焼炉に装入する前に、ペレタイザーで粒度３．３５〜
５．６ｍｍのペレットとした。炭素質還元剤として、粒
度１．０〜２．０ｍｍのコークス塊を使用し、装入量
は、鉄鋼ダストＡに対する質量比で０．２０とした。ま
た、これらに配合する石灰分として、石灰石の粉末を使
用し、装入量は、コークスに対してＣａＯ換算で０．０
０、０．０３、０．１４、０．４０の質量比とした。The iron and steel dust A has a grain size of 3.35 with a pelletizer before being charged into a rotary roasting furnace which is a test furnace.
It was a 5.6 mm pellet. A coke lump having a particle size of 1.0 to 2.0 mm was used as the carbonaceous reducing agent, and the charging amount was 0.20 in terms of mass ratio to the steel dust A. In addition, limestone powder is used as the lime to be added to these, and the charging amount is 0.0 in terms of CaO with respect to coke.
The mass ratio was 0, 0.03, 0.14, 0.40.
【００１８】これらの鉄鋼ダストＡ、コークス、石灰石
を、水平式回転焙焼炉に装入し、１１００℃で１時間焙
焼した。１１００℃という設定温度は、実機のキルン操
業における温度としてはやや低めの温度である。焙焼終
了後、焙焼炉内に残渣として残った還元鉄ペレットを取
り出し、還元ペレット中に残留している亜鉛量を分析し
た。得られた亜鉛の質量と、装入した鉄鋼ダストＡに含
まれる亜鉛の質量との比から、亜鉛揮発率を求めた。The steel dust A, coke and limestone were charged into a horizontal rotary roasting furnace and roasted at 1100 ° C. for 1 hour. The set temperature of 1100 ° C is a rather low temperature in the actual kiln operation. After the roasting was completed, the reduced iron pellets remained as a residue in the roasting furnace were taken out, and the amount of zinc remaining in the reduced pellets was analyzed. The zinc volatilization rate was determined from the ratio of the mass of the obtained zinc and the mass of the zinc contained in the charged steel dust A.
【００１９】図１に、石灰分に対する亜鉛揮発率を示
す。FIG. 1 shows the volatilization ratio of zinc to lime.
【００２０】（実施例２）鉄鋼ダストＢを１ｋｇ使用し
た以外は、実施例１と同様にして、還元焙焼を行い、石
灰分に対する亜鉛揮発率の変化を測定した。図１に、結
果を示す。(Example 2) Reduction roasting was carried out in the same manner as in Example 1 except that 1 kg of iron and steel dust B was used, and changes in the zinc volatilization rate with respect to the lime content were measured. The results are shown in FIG.
【００２１】図１より、炭素質還元剤であるコークスに
加えて、石灰分を添加すると、標準的な亜鉛量を含有す
る実施例２（鉄鋼ダストＢ）と、亜鉛量の多い実施例１
（鉄鋼ダストＡ）とで、亜鉛揮発率はともに増加し、石
灰石の添加量を多くするほど、亜鉛揮発率は高くなるこ
とが分かる。また、亜鉛量の多い実施例１は、標準的な
亜鉛量の実施例２より、亜鉛揮発率が低くなる傾向があ
るが、石灰分添加量が炭素質還元剤に対してＣａＯ換算
で０．１５以上では、９０％以上の揮発率が得られる。From FIG. 1, when lime is added in addition to coke which is a carbonaceous reducing agent, Example 2 (steel dust B) containing a standard amount of zinc and Example 1 with a large amount of zinc
It can be seen that with (Steel Dust A), the zinc volatilization rate increases, and the larger the amount of limestone added, the higher the zinc volatilization rate. Further, in Example 1 having a large amount of zinc, the zinc volatilization rate tends to be lower than that in Example 2 having a standard amount of zinc, but the amount of lime added is 0.10 in terms of CaO with respect to the carbonaceous reducing agent. When it is 15 or more, a volatilization rate of 90% or more is obtained.
【００２２】また、焙焼温度を、実機の操業の場合より
低めに設定したにも関わらず、亜鉛量の多い実施例１で
も、１００％に近い亜鉛揮発率を達成することができ
た。Further, even though the roasting temperature was set lower than in the case of the operation of an actual machine, even in Example 1 having a large amount of zinc, a zinc volatilization rate close to 100% could be achieved.
【００２３】[0023]
【発明の効果】本発明によれば、鉄鋼ダストの還元焙焼
操業において、還元焙焼温度を従来の温度以上に高くす
ることなく、亜鉛揮発率、すなわち亜鉛の回収率を大幅
に増加させることができる。According to the present invention, in the reducing and roasting operation of iron and steel dust, the zinc volatilization rate, that is, the recovery rate of zinc, can be significantly increased without increasing the reducing and roasting temperature above the conventional temperature. You can
【図１】 鉄鋼ダストの還元焙焼における石灰分に対す
る亜鉛揮発率の変化を示すグラフである。FIG. 1 is a graph showing changes in the zinc volatilization rate with respect to lime content during reduction roasting of iron and steel dust.
フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｃ２２Ｂ 19/30 Ｂ０９Ｂ 3/00 ３０３Ｌ ３０４Ｇ (72)発明者 金坂 淳 愛媛県新居浜市磯浦町17−５ 住友金属鉱 山株式会社新居浜研究所内 Ｆターム(参考） 4D004 AA37 AC04 BA05 CA22 CA37 CB09 CC11 DA03 DA10 4K001 AA30 BA14 CA23 DA07 GA07 HA01 KA06 Continuation of front page (51) Int.Cl. 7 Identification code FI theme code (reference) C22B 19/30 B09B 3/00 303L 304G (72) Inventor Atsushi Kanasaka 17-5 Isoura-cho, Niihama-shi, Ehime Sumitomo Metal Mines F term in Niihama Research Co., Ltd. (reference) 4D004 AA37 AC04 BA05 CA22 CA37 CB09 CC11 DA03 DA10 4K001 AA30 BA14 CA23 DA07 GA07 HA01 KA06
Claims (2)
剤および石灰分を添加して行う還元焙焼により、亜鉛を
揮発回収する操業方法において、前記石灰分の添加量
が、前記炭素質還元剤に対して、ＣａＯ換算で０．０３
以上の質量比であることを特徴とする鉄鋼ダスト還元ロ
ータリーキルンの操業方法。1. In an operating method for volatilizing and recovering zinc by reduction roasting performed by adding a carbonaceous reducing agent and lime to iron-containing steel dust containing zinc, the addition amount of the lime is less than the carbonaceous reduction. 0.03 in terms of CaO for the agent
A method for operating a steel dust reduction rotary kiln having the above mass ratio.
て、ＣａＯ換算で０．１５以上の質量比であることを特
徴とする請求項１に記載の鉄鋼ダスト還元ロータリーキ
ルンの操業方法。2. The method of operating a steel dust reduction rotary kiln according to claim 1, wherein the amount of lime added is a mass ratio of 0.15 or more in terms of CaO with respect to the carbonaceous reducing agent. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002157309A JP2003342649A (en) | 2002-05-30 | 2002-05-30 | Process for operating rotary kiln used for reducing iron and steel dust |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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Family
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013159797A (en) * | 2012-02-02 | 2013-08-19 | Nippon Steel & Sumitomo Metal Corp | Method of producing reduced iron |
| JP2015059264A (en) * | 2013-09-20 | 2015-03-30 | 住友金属鉱山株式会社 | Method of operating reduction roasting furnace |
| KR20160138484A (en) * | 2014-03-25 | 2016-12-05 | 후루카와 덴키 고교 가부시키가이샤 | Copper alloy sheet material, connector, and method for manufacturing copper alloy sheet material |
| EP3450580A4 (en) * | 2016-04-28 | 2019-10-30 | Tohoku University | Method for processing iron and steel dust, method for producing zinc, method for producing starting material for iron and steel, and starting material for iron and steel |
-
2002
- 2002-05-30 JP JP2002157309A patent/JP2003342649A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013159797A (en) * | 2012-02-02 | 2013-08-19 | Nippon Steel & Sumitomo Metal Corp | Method of producing reduced iron |
| JP2015059264A (en) * | 2013-09-20 | 2015-03-30 | 住友金属鉱山株式会社 | Method of operating reduction roasting furnace |
| KR20160138484A (en) * | 2014-03-25 | 2016-12-05 | 후루카와 덴키 고교 가부시키가이샤 | Copper alloy sheet material, connector, and method for manufacturing copper alloy sheet material |
| KR102370860B1 (en) | 2014-03-25 | 2022-03-07 | 후루카와 덴키 고교 가부시키가이샤 | Copper alloy sheet material, connector, and method for manufacturing copper alloy sheet material |
| EP3450580A4 (en) * | 2016-04-28 | 2019-10-30 | Tohoku University | Method for processing iron and steel dust, method for producing zinc, method for producing starting material for iron and steel, and starting material for iron and steel |
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