JPH07224331A - Recycling method of reduced iron pellets in iron dust reduction rotary kiln operation. - Google Patents
Recycling method of reduced iron pellets in iron dust reduction rotary kiln operation.Info
- Publication number
- JPH07224331A JPH07224331A JP1438194A JP1438194A JPH07224331A JP H07224331 A JPH07224331 A JP H07224331A JP 1438194 A JP1438194 A JP 1438194A JP 1438194 A JP1438194 A JP 1438194A JP H07224331 A JPH07224331 A JP H07224331A
- Authority
- JP
- Japan
- Prior art keywords
- rotary kiln
- pellets
- steel dust
- iron
- reduction rotary
- 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)
Abstract
(57)【要約】
【目的】 鉄鋼ダストを還元ロータリーキルンで処理す
る操業において、炭材原単位及び石灰石原単位を低下さ
せて、安定操業を行なえるようにする。
【構成】 Ｚｎ，Ｐｂを含有する鉄鋼ダストをペレット
に造粒し、炭素質還元剤とともに還元ロータリーキルン
を用いて還元焙焼する鉄鋼ダスト還元ロータリーキルン
操業において、Ｚｎ，Ｐｂ回収後の残渣である還元鉄ペ
レットの一定粒子径以下のものをそのまま、あるいは粉
砕後、鉄鋼ダストに添加混合して造粒し、還元ロータリ
ーキルンに装入する。(57) [Abstract] [Purpose] In the operation of treating steel dust in a reduction rotary kiln, the carbonaceous material unit and the limestone unit are reduced to enable stable operation. [Structure] Steel dust containing Zn and Pb is granulated into pellets and reduced and roasted using a reduction rotary kiln together with a carbonaceous reducing agent. Iron and steel dust reduction rotary kiln operation, reduced iron which is a residue after recovery of Zn and Pb Pellets having a certain particle size or less are pulverized as they are or after being added to and mixed with steel dust to be granulated, and then charged into a reduction rotary kiln.
Description
【０００１】[0001]
【産業上の利用分野】本発明は、鉄鋼ダスト還元ロータ
リーキルンの操業の改良に関し、特に、炭材原単位及び
石灰石原単位を低下し、安定操業を行なう方法に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in the operation of a steel dust reduction rotary kiln, and more particularly to a method for lowering the carbonaceous material consumption rate and the limestone consumption rate for stable operation.
【０００２】[0002]
【従来の技術】鉄鋼ダストが含有するＺｎ，Ｐｂ等の有
価金属は、炭素質還元剤（以下、炭材という）とともに
還元ロータリーキルンを用いて還元焙焼することによる
還元揮発や、ＮａＣｌ等の塩化剤を用いた塩化揮発等に
より回収される。2. Description of the Related Art Valuable metals such as Zn and Pb contained in steel dust are reduced and volatilized by reduction roasting using a reduction rotary kiln together with a carbonaceous reducing agent (hereinafter referred to as carbonaceous material) and chlorination of NaCl and the like. It is recovered by volatilization of chloride using an agent.
【０００３】還元揮発による回収では、鉄鋼ダストに炭
材を添加混合してロータリーキルンで焙焼する方法が行
なわれている。またこの方法では、キルン内壁への原料
の付着防止のためのスラグの融点の調整、あるいは、鉄
鋼ダストに含まれているフッ素（以下、Ｆと記す）の固
定剤として石灰石を装入する手法も実施されている。For recovery by reduction volatilization, a method of adding and mixing carbonaceous material to iron and steel dust and roasting in a rotary kiln is performed. In addition, in this method, the melting point of the slag is adjusted to prevent the raw material from adhering to the inner wall of the kiln, or limestone is charged as a fixing agent for the fluorine (hereinafter referred to as F) contained in the steel dust. It has been implemented.
【０００４】[0004]
【発明が解決しようとする課題】本発明は、鉄鋼ダスト
を還元ロータリーキルンで処理する操業において、炭材
原単位及び石灰石原単位を低下させて、安定操業を行な
えるようにすることを課題とする。SUMMARY OF THE INVENTION It is an object of the present invention to reduce the basic unit of carbonaceous material and the basic unit of limestone in an operation of treating steel dust in a reduction rotary kiln so that stable operation can be performed. .
【０００５】[0005]
【課題を解決するための手段】上記課題を解決するため
に、本発明は、Ｚｎ，Ｐｂを含有する鉄鋼ダストをペレ
ットに造粒し、炭素質還元剤とともに還元ロータリーキ
ルンを用いて還元焙焼することによりＺｎ，Ｐｂを揮発
回収する鉄鋼ダスト還元ロータリーキルン操業におい
て、Ｚｎ，Ｐｂ回収後の残渣である還元鉄ペレットを篩
分け、一定粒子直径以下の還元鉄ペレットをそのままあ
るいは粉砕後、鉄鋼ダストに添加混合し、造粒して還元
ロータリーキルンに装入することを特徴とする鉄鋼ダス
ト還元ロータリーキルン操業における還元鉄ペレットの
再利用方法にある。In order to solve the above-mentioned problems, the present invention granulates steel dust containing Zn and Pb into pellets and carries out reduction roasting using a reduction rotary kiln together with a carbonaceous reducing agent. Thus, in a rotary dusting kiln operation for reducing iron and steel dust that volatilizes and recovers Zn and Pb, reduced iron pellets that are the residues after Zn and Pb recovery are sieved, and reduced iron pellets with a certain particle diameter or less are added to the iron and steel dust as they are or after pulverization. It is a method for reusing reduced iron pellets in a steel dust reduction rotary kiln operation, which comprises mixing, granulating and charging in a reducing rotary kiln.
【０００６】[0006]
【作用】Ｚｎ，Ｐｂ回収後の残渣である還元鉄ペレット
は、Ｃ，あるいはＣａＯ等を豊富に含んでいるにもかか
わらず、利用されないまま埋め立て等により処理されて
いるものである。本発明においては、鉄鋼ダストと同時
に添加される炭材及び石灰石の一部の代替として還元鉄
ペレット中のＣ及びＣａＯを利用するものである。The reduced iron pellets, which are the residues after the recovery of Zn and Pb, are abundantly containing C, CaO, etc., but are treated by landfilling without being used. In the present invention, C and CaO in the reduced iron pellets are used as a substitute for a part of the carbonaceous material and limestone added at the same time as the iron and steel dust.
【０００７】一定粒子直径以下の還元鉄ペレット、特に
粒子直径２ｍｍ以下の還元鉄ペレットは、より大きい粒
子直径のペレットに比べて、含まれるＣ，ＣａＯの存在
量が比較的多いという点で、目的とする再利用に適す
る。[0007] Reduced iron pellets having a certain particle diameter or less, particularly reduced iron pellets having a particle diameter of 2 mm or less, have the objective of containing a relatively large amount of C and CaO contained therein as compared with pellets having a larger particle diameter. Suitable for reuse.
【０００８】また、製鉄原料として高炉や転炉での再資
源化を考えた場合、粒子直径の小さいペレットや粉状の
還元鉄ペレットは、ハンドリングや炉の通風確保の点か
ら好ましくなく、これを鉄鋼ダスト還元ロータリーキル
ンで利用、処理できることは、この観点からも好都合で
ある。Further, when considering recycling as a raw material for iron making in a blast furnace or a converter, pellets having a small particle diameter or powdered reduced iron pellets are not preferable from the viewpoint of handling and securing ventilation of the furnace. The fact that it can be used and processed in a steel dust reduction rotary kiln is also advantageous from this point of view.
【０００９】したがって本発明においては、一定粒子直
径以下の還元鉄ペレット、特に好ましくは粒子直径２ｍ
ｍ以下の還元鉄ペレットをそのままあるいは粉砕後、鉄
鋼ダストに混合する。なお、粒子直径は２ｍｍ以下であ
っても、比較的粗粒のものと細粒のものとあるので、細
粒のものは粉砕せずそのまま鉄鋼ダストに混合できる。Therefore, in the present invention, reduced iron pellets having a particle diameter of less than a certain value, particularly preferably a particle diameter of 2 m
Reduced iron pellets of m or less are mixed as they are or after pulverization with steel dust. Even if the particle diameter is 2 mm or less, there are relatively coarse particles and fine particles, and therefore fine particles can be directly mixed with steel dust without crushing.
【００１０】本発明においては、後記する実施例で明ら
かなように、還元鉄ペレットに残留するＣ及びＣａＯ
が、新規に添加するコークスや石灰石とほぼ同等の作用
をし、還元鉄ペレットに含まれるＣ及びＣａＯを再利用
することによって炭材及び石灰石の原単位を低下でき
る。In the present invention, as will be apparent from the examples described below, C and CaO remaining in the reduced iron pellets.
However, it has almost the same effect as newly added coke and limestone, and by reusing C and CaO contained in the reduced iron pellets, it is possible to reduce the basic unit of carbonaceous material and limestone.
【００１１】[0011]
【実施例】以下に述べる実施例および比較例で使用した
鉄鋼ダスト及び還元鉄ペレットの組成を表１に示す。な
お、表１中、２ｍｍ以上の還元ペレットの組成は参考の
ために示したもので、使用したのは２ｍｍ以下のもので
ある。EXAMPLES Table 1 shows the compositions of the iron and steel dust and the reduced iron pellets used in the examples and comparative examples described below. In Table 1, the composition of the reduced pellets having a size of 2 mm or more is shown for reference, and the composition used is 2 mm or less.
【００１２】[0012]
【表１】 [Table 1]
【００１３】実施例 試験用小型転動炉（反応管：ＳＵＳ製１２５ｍｍφ×２
００ｍＬ）を用い、篩分けによって得た粒子直径２ｍｍ
以下のものを粉砕した還元鉄ペレットの粉を８５ｇと鉄
鋼ダスト２１５ｇを混合し、ペレタイザーによって造粒
した後、乾燥した粒子直径３．５〜６ｍｍのペレット
と、粉コークス４２．５ｇを反応管内に装入し、昇温時
間も含め、雰囲気ガスとしてＮ2 とＣＯ2 を８５：１５
の割合で混合したガスを毎分２リットルの流量で流し、
反応管は１２ｒ．ｐ．ｍの回転数で回転させた。室温か
ら設定温度までの昇温時間を１ｈｒとし、設定温度を１
０００℃，１１００℃に制御しながら、設定温度での保
持時間を０，１，２ｈｒとして処理したペレットを炉外
で冷却後、全量粉砕して化学分析し、Ｚｎ，Ｐｂ揮発率
及びフッ素固定率を算出した。これを表２に示す。Example Small tumbling furnace for testing (reaction tube: SUS 125 mmφ × 2
Particle diameter 2 mm obtained by sieving using
85 g of reduced iron pellet powder obtained by crushing the following was mixed with 215 g of steel dust and granulated by a pelletizer, and then dried pellets having a diameter of 3.5 to 6 mm and 42.5 g of coke powder were placed in a reaction tube. After charging, including the temperature rising time, N 2 and CO 2 were 85:15 as an atmosphere gas.
The mixed gas at a flow rate of 2 liters per minute,
The reaction tube is 12 r. p. It was rotated at a rotation speed of m. The temperature rise time from room temperature to the set temperature is 1 hr, and the set temperature is 1
While controlling at 000 ° C and 1100 ° C, the pellets treated with the holding time at the set temperature of 0, 1 and 2 hours were cooled outside the furnace, and then the whole amount was crushed and chemically analyzed to obtain Zn, Pb volatilization rate and fluorine fixing rate. Was calculated. This is shown in Table 2.
【００１４】また、装入物中のＣａＯ／ＳｉＯ2 重量比
＝１．２９となった。Further, the weight ratio of CaO / SiO 2 in the charging material was 1.29.
【００１５】比較例 試験用小型転動炉（反応管：ＳＵＳ製１２５ｍｍφ×２
００ｍｍＬ）を用い、鉄鋼ダスト３００ｇを、ペレタイ
ザーによって造粒した後、乾燥した粒子直径３．５〜６
ｍｍのペレットと、粉コークス７０ｇ及び粉石灰２５ｇ
を、反応管内に装入し、昇温時間も含め、雰囲気ガスと
してＮ2 とＣＯ2 を８５：１５の割合で混合したガスを
毎分２リットルで流し、反応管は１２ｒ．ｐ．ｍの回転
数で回転させた。室温から設定温度までの昇温時間を１
ｈｒとし、設定温度を１０００℃，１１００℃に制御し
ながら、設定温度での保持時間を、０，１，２ｈｒとし
て処理したペレットを炉外で冷却後、全量粉砕して化学
分析し、Ｚｎ，Ｐｂ揮発率及びフッ素固定率を算出し
た。これを表２に示す。Comparative Example Small tumbling furnace for test (reaction tube: SUS 125 mmφ × 2
00gL), 300g of iron and steel dust was granulated by a pelletizer, and then dried particle diameter 3.5 to 6
mm pellets, powder coke 70 g and powder lime 25 g
Was charged into the reaction tube, and a gas containing N 2 and CO 2 mixed at a ratio of 85:15 as an atmosphere gas was flowed at a rate of 2 liters per minute including the temperature rising time. p. It was rotated at a rotation speed of m. Increase the temperature from room temperature to the set temperature by 1
While controlling the set temperature at 1000 ° C. and 1100 ° C. for hr, the pellets treated at the set temperature of 0, 1 and 2 hr were cooled outside the furnace, and then the whole amount was crushed for chemical analysis. The Pb volatilization rate and the fluorine fixation rate were calculated. This is shown in Table 2.
【００１６】また、装入物中のＣａＯ／ＳｉＯ2 重量比
＝１．８８となった。The CaO / SiO 2 weight ratio in the charge was 1.88.
【００１７】[0017]
【表２】 [Table 2]
【００１８】表２から明らかなように、実施例と比較例
とを比較しても、Ｚｎ，Ｐｂの揮発率に差はない。Ｃａ
Ｏ源のインプット量が異なるために、ＣａＯ／ＳｉＯ2
比が異なり、フッ素の固定率が約１０％低下している
が、比較例に見合う程度の石灰分を補うことにより、同
程度のフッ素固定率が得られることが期待できる。した
がって、石灰石を補なったとしても、大幅に石灰石原単
位を低下できる。As is apparent from Table 2, there is no difference in the volatility of Zn and Pb even when the examples and the comparative examples are compared. Ca
CaO / SiO 2 due to different input amount of O source
Although the ratios are different and the fixing rate of fluorine is reduced by about 10%, it can be expected that the same fixing rate of fluorine can be obtained by supplementing the lime content corresponding to the comparative example. Therefore, even if limestone is supplemented, the limestone basic unit can be significantly reduced.
【００１９】[0019]
【発明の効果】以上、詳細に説明したように、本発明の
方法によって、炭材原単位及び石灰石原単位の低下がな
され、且つ安定操業が可能であり、また、鉄原料として
の再利用が困難な細かな還元鉄ペレットが有効に利用で
きる。As described above in detail, according to the method of the present invention, the unit consumption of carbonaceous material and the unit consumption of limestone can be reduced, stable operation is possible, and the reuse as an iron raw material is possible. Difficult fine iron pellets can be effectively used.
Claims (1)
ットに造粒し、炭素質還元剤とともに還元ロータリーキ
ルンを用いて還元焙焼することによりＺｎ，Ｐｂを揮発
回収する鉄鋼ダスト還元ロータリーキルン操業におい
て、Ｚｎ，Ｐｂ回収後の残渣である還元鉄ペレットを篩
分け、一定粒子直径以下の還元鉄ペレットをそのままあ
るいは粉砕後、鉄鋼ダストに添加混合し、造粒して還元
ロータリーキルンに装入することを特徴とする鉄鋼ダス
ト還元ロータリーキルン操業における還元鉄ペレットの
再利用方法。1. A steel dust reduction rotary kiln operation in which Zn and Pb are volatilized and recovered by granulating iron and steel dust containing Zn and Pb into pellets and reducing and roasting with a carbonaceous reducing agent using a reduction rotary kiln. The reduced iron pellets, which are the residue after recovering Zn and Pb, are sieved, and reduced iron pellets with a certain particle diameter or less are pulverized as they are or after being added to and mixed with steel dust, granulated and charged into a reducing rotary kiln. Method for Reusing Reduced Iron Pellets in Iron and Steel Dust Reduction Rotary Kiln Operation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1438194A JPH07224331A (en) | 1994-02-08 | 1994-02-08 | Recycling method of reduced iron pellets in iron dust reduction rotary kiln operation. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1438194A JPH07224331A (en) | 1994-02-08 | 1994-02-08 | Recycling method of reduced iron pellets in iron dust reduction rotary kiln operation. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07224331A true JPH07224331A (en) | 1995-08-22 |
Family
ID=11859476
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1438194A Pending JPH07224331A (en) | 1994-02-08 | 1994-02-08 | Recycling method of reduced iron pellets in iron dust reduction rotary kiln operation. |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07224331A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012201946A (en) * | 2011-03-25 | 2012-10-22 | Sumitomo Metal Mining Co Ltd | Operation method of rotary kiln for reduction-roasting of steel dust |
| JP2013159797A (en) * | 2012-02-02 | 2013-08-19 | Nippon Steel & Sumitomo Metal Corp | Method of producing reduced iron |
| CN110760673A (en) * | 2019-11-19 | 2020-02-07 | 河池学院 | Zinc leaching residue volatilizing kiln treatment method |
| CN111996371A (en) * | 2020-08-27 | 2020-11-27 | 中冶东方工程技术有限公司 | Resource utilization production process for stainless steel solid waste |
-
1994
- 1994-02-08 JP JP1438194A patent/JPH07224331A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012201946A (en) * | 2011-03-25 | 2012-10-22 | Sumitomo Metal Mining Co Ltd | Operation method of rotary kiln for reduction-roasting of steel dust |
| JP2013159797A (en) * | 2012-02-02 | 2013-08-19 | Nippon Steel & Sumitomo Metal Corp | Method of producing reduced iron |
| CN110760673A (en) * | 2019-11-19 | 2020-02-07 | 河池学院 | Zinc leaching residue volatilizing kiln treatment method |
| CN110760673B (en) * | 2019-11-19 | 2021-06-01 | 河池学院 | A kind of zinc leaching residue volatilization kiln treatment method |
| CN111996371A (en) * | 2020-08-27 | 2020-11-27 | 中冶东方工程技术有限公司 | Resource utilization production process for stainless steel solid waste |
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