JP2001240919A - Method for enriching zinc in steelmaking dust - Google Patents
Method for enriching zinc in steelmaking dustInfo
- Publication number
- JP2001240919A JP2001240919A JP2000055625A JP2000055625A JP2001240919A JP 2001240919 A JP2001240919 A JP 2001240919A JP 2000055625 A JP2000055625 A JP 2000055625A JP 2000055625 A JP2000055625 A JP 2000055625A JP 2001240919 A JP2001240919 A JP 2001240919A
- Authority
- JP
- Japan
- Prior art keywords
- zinc
- hot metal
- steelmaking dust
- metal pretreatment
- 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.)
- Granted
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
- Carbon Steel Or Casting Steel Manufacturing (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
(57)【要約】
【課題】亜鉛含有スクラップから効率的に亜鉛元素の含
有率が高い亜鉛一次精錬業向けにリサイクル容易な製鋼
ダストを得ることが可能な製鋼ダストの亜鉛濃縮方法を
提供すること。
【解決手段】溶銑予備処理炉で予備処理を行った後、転
炉で脱炭処理を行う鋼の精錬工程において、予め亜鉛含
有スクラップ１０を装入してある溶銑予備処理炉１に溶
銑１１を装入して亜鉛含有スクラップ１０中の金属亜鉛
を加熱蒸発させ、溶銑予備処理炉１から発生する前記亜
鉛成分を含む製鋼ダストを回収して亜鉛一次精錬業向け
にリサイクル可能とする。
[PROBLEMS] To provide a method for enriching steelmaking dust with zinc, which is capable of obtaining easily recyclable steelmaking dust from a zinc-containing scrap for a primary zinc smelting business having a high zinc element content. . In a steel refining process in which a pretreatment is performed in a hot metal pretreatment furnace and then a decarburization process is performed in a converter, hot metal 11 is placed in a hot metal pretreatment furnace 1 in which zinc-containing scrap 10 has been charged in advance. The metal zinc in the zinc-containing scrap 10 is charged and heated and evaporated, and the steelmaking dust containing the zinc component generated from the hot metal pretreatment furnace 1 is recovered and made recyclable for the zinc primary refining industry.
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、亜鉛含有スクラッ
プから効率的に亜鉛成分の含有率が高く、亜鉛一次精錬
用の亜鉛原材料としてリサイクル容易な製鋼ダストを得
る製鋼ダストの亜鉛濃縮方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for enriching zinc in steelmaking dust from a zinc-containing scrap to obtain an easily recyclable steelmaking dust as a zinc raw material for primary refining of zinc from a zinc-containing scrap. is there.
【０００２】[0002]
【従来の技術】従来から、省資源を目的として鉄スクラ
ップのリサイクルが図られている。この鉄スクラップに
は、亜鉛系めっき鋼板などの亜鉛成分（特に金属亜鉛）
を含むものが多いため、亜鉛含有スクラップを用いて鋼
を製造する場合には、亜鉛成分は除去することが好まし
い。そこで、スクラップを利用して鋼を製造する場合に
は、鋼の成分調整を行う精錬工程において亜鉛の回収を
行うのが普通であり、このため、例えば、特開平7-2631
7 号公報や特開平10-121122 号公報や特開昭63-62813号
公報などに開示されているように、種々の回収方法が提
案されている。2. Description of the Related Art Conventionally, iron scrap has been recycled for the purpose of saving resources. This iron scrap contains zinc components (particularly metallic zinc) such as galvanized steel sheets.
In many cases, when steel is manufactured using zinc-containing scrap, the zinc component is preferably removed. Therefore, when producing steel using scrap, it is common to recover zinc in a refining process for adjusting the composition of steel. For this reason, for example, JP-A-7-2631
Various recovery methods have been proposed as disclosed in, for example, Japanese Patent Application Laid-Open No. 7-210, Japanese Patent Application Laid-Open No. 10-121122, and Japanese Patent Application Laid-Open No. 63-62813.
【０００３】前記した特開平7-26317 号公報に開示され
ている技術は、脱珪脱燐工程の溶銑中に亜鉛スクラップ
を装入して高濃度の亜鉛含有ダストを回収するものであ
るが、この方法による場合は一部の亜鉛が溶銑中に溶解
し、この溶解した亜鉛を蒸発、除去するのに長時間要す
るという問題点があった。また、回収したダスト中の亜
鉛濃度は９．３％程度と低濃度であり、２５％以上，好
ましくは４０％程度の濃度が必要とされる亜鉛一次精錬
用の亜鉛源としてリサイクルすることが工業的に困難で
あった。 尚、以下の記載において、％とppm の記載は質
量比とする。また、特開平10-121122 号公報に開示され
ている技術は、亜鉛含有ダストを溶銑中に不活性ガスで
吹込み高濃度の亜鉛を回収するものであるが、これによ
る場合には亜鉛の還元蒸発に溶銑の顕熱のみ利用するの
で、亜鉛を確実に回収するのには鋼精錬プロセスとは別
プロセスを設ける必要があり、また、分解反応に伴う熱
ロスが増加して熱的余裕度が減少するとともに、亜鉛が
銑鉄に溶解して次工程で発生するダストの汚染を招くと
いう問題点があった。更には、回収した亜鉛含有ダスト
は前記した方法と同様低濃度であって、亜鉛一次精錬業
へリサイクルすることは困難であった。また、特開昭63-
62813号公報に開示されている技術は、転炉内にスクラ
ップとともに電気炉ダストや亜鉛メッキドロス等酸化物
の亜鉛含有廃棄物を投入し、溶銑によりスクラップ溶
解、吹錬する際に発生したダスト中の亜鉛を回収するも
のであるが、このような亜鉛含有廃棄物では亜鉛は酸化
物であり容易に還元されず、また還元は溶銑中Ｃとの反
応であり、不可避的に亜鉛が溶銑中に溶解して次工程で
のダストを汚染するという問題点があった。更には、回
収した亜鉛含有ダストは前記した方法と同様に低濃度で
あって、亜鉛一次精錬業用にリサイクルして使用するこ
とが工業的に困難であった。[0003] The technique disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 7-26317 is to charge high-concentration zinc-containing dust by charging zinc scrap into hot metal in a desiliconization and dephosphorization step. According to this method, there is a problem that a part of zinc is dissolved in the hot metal, and it takes a long time to evaporate and remove the dissolved zinc. The concentration of zinc in the collected dust is as low as about 9.3%, and it is industrially necessary to recycle it as a zinc source for primary refining of zinc, which requires a concentration of 25% or more, preferably about 40%. Was difficult. In the following description,% and ppm are expressed by mass ratio. Further, the technique disclosed in Japanese Patent Application Laid-Open No. H10-121122 is to blow zinc-containing dust into hot metal with an inert gas to recover high-concentration zinc. Since only the sensible heat of the hot metal is used for evaporation, it is necessary to provide a separate process from the steel refining process to reliably recover zinc.In addition, the heat loss accompanying the decomposition reaction increases and the thermal margin is increased. In addition to the decrease, there is a problem that zinc dissolves in pig iron and causes contamination of dust generated in the next process. Furthermore, the recovered zinc-containing dust has a low concentration as in the above-described method, and it has been difficult to recycle the dust to the zinc primary smelting industry. In addition, JP-A-63-
The technology disclosed in the 62813 gazette is to throw electric furnace dust and zinc-containing waste such as galvanized dross together with scrap into a converter, melt the scrap with hot metal, Zinc is recovered. In such zinc-containing waste, zinc is an oxide and is not easily reduced, and reduction is a reaction with C in hot metal, and zinc is inevitably dissolved in hot metal. Thus, there is a problem that the dust is contaminated in the next process. Furthermore, the recovered zinc-containing dust has a low concentration similarly to the above-mentioned method, and it has been industrially difficult to recycle and use it for the zinc primary smelting industry.
【０００４】[0004]
【発明が解決しようとする課題】本発明は上記のような
従来の問題点を解決して、鋼の精錬工程中の予備処理工
程で亜鉛含有スクラップから効率的に亜鉛成分（例えば
スクラップに付着した金属亜鉛）を製鋼ダストに回収し
て亜鉛一次精錬業にリサイクルしやすくするとともに、
次の脱炭処理を行う転炉に亜鉛成分が持ち込まれること
をなくすことができる製鋼ダストの亜鉛濃縮方法を提供
することを目的として完成されたものである。SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems and efficiently removes zinc components (for example, adhered to scraps) from zinc-containing scraps in a pretreatment step during a steel refining process. Metallic zinc) is collected into steelmaking dust to facilitate recycling in the primary zinc refining industry,
The present invention has been completed for the purpose of providing a method for enriching zinc in steelmaking dust, which can prevent zinc components from being introduced into a converter for performing the next decarburization treatment.
【０００５】[0005]
【課題を解決するための手段】上記の課題を解決するた
めになされた本発明は、溶銑予備処理炉で予備処理を行
った後に、転炉で脱炭工程を行う鋼の精錬工程におい
て、予め亜鉛含有スクラップを装入してある溶銑予備処
理炉にて、亜鉛含有スクラップ中の金属亜鉛を加熱蒸発
させ、その後に溶銑を装入して、溶銑予備処理炉から発
生する亜鉛酸化物を含む精錬ダストを回収することを特
徴とする製鋼ダストの亜鉛濃縮方法を請求項１に係る発
明とする。SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. In a steel refining step of performing a decarburization step in a converter after performing a pretreatment in a hot metal pretreatment furnace, In a hot metal pre-processing furnace loaded with zinc-containing scrap, heat and evaporate the metallic zinc in the zinc-containing scrap, and then charge the hot metal and refine it containing zinc oxide generated from the hot metal pre-processing furnace. A method for concentrating zinc in steelmaking dust, comprising collecting dust, is defined as the invention according to claim 1.
【０００６】また、前記した発明において、溶銑予備処
理炉に亜鉛含有スクラップを装入する前に予め金属亜鉛
の加熱蒸発に十分な温度に溶銑予備処理炉を加熱してお
くようにした製鋼ダストの亜鉛濃縮方法を請求項２に係
る発明とする。更に、亜鉛含有スクラップを装入してあ
る溶銑予備処理炉に溶銑を装入後、この溶銑予備処理炉
に請求項１または２により得られた亜鉛酸化物を含む精
錬ダストを、石灰石および／またはソーダ灰とともに吹
込み、その上方から酸素を加えてこの溶銑予備処理炉か
ら発生する高濃度化された亜鉛成分を含む製鋼ダストを
回収することを特徴とする製鋼ダストの亜鉛濃縮方法を
請求項３に係る発明とする。Further, in the above invention, before the zinc-containing scrap is charged into the molten iron pretreatment furnace, the steelmaking dust is heated to a temperature sufficient for heating and evaporating the metallic zinc in advance. The zinc enrichment method is the invention according to claim 2. Further, after charging the hot metal into a hot metal pretreatment furnace charged with zinc-containing scrap, the refined dust containing zinc oxide obtained according to claim 1 or 2 is supplied to the hot metal pretreatment furnace with limestone and / or 4. A method for enriching zinc in steelmaking dust, which comprises blowing in with soda ash and adding oxygen from above to collect steelmaking dust containing a highly concentrated zinc component generated from the hot metal pretreatment furnace. The invention according to the present invention.
【０００７】[0007]
【発明の実施の形態】以下に、図面を参照しつつ本発明
の好ましい実施の形態を示す。図中、１は鋼の精錬工程
における溶銑予備処理炉、 ２ａは溶銑予備処理炉１に設
けられたダストの吸引用フード、３は溶銑予備処理炉１
にスクラップを装入するためのスクラップシュートであ
り、これらの構成は従来のものと同じであるが、本発明
はこのような溶銑予備処理炉１で溶銑の予備処理を行っ
た後、転炉４で脱炭処理を行う鋼の精錬工程において、
高温の溶銑予備処理炉１に予め亜鉛含有スクラップ１０
を装入し、亜鉛含有スクラップ１０中の亜鉛成分（特に
金属亜鉛）を加熱蒸発させ、この溶銑予備処理炉１から
発生する前記亜鉛成分を含む精錬ダストを回収して、そ
の後に溶銑１１を装入して溶銑予備処理（例えば溶銑の
脱珪、脱燐処理等）を行い、製鋼ダスト中の亜鉛濃度を
高濃度化する点に特徴がある。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. In the figure, 1 is a hot metal pretreatment furnace in a steel refining process, 2a is a dust suction hood provided in the hot metal pretreatment furnace 1, and 3 is a hot metal pretreatment furnace 1.
This is a scrap chute for charging scrap into a hot metal pretreatment furnace 1 of the present invention. In the steel refining process where decarburization treatment is performed,
The zinc-containing scrap 10 is previously placed in the hot metal pretreatment furnace 1.
And the zinc component (especially metallic zinc) in the zinc-containing scrap 10 is heated and evaporated, and the refining dust containing the zinc component generated from the hot metal pretreatment furnace 1 is recovered, and thereafter the hot metal 11 is loaded. The molten iron is preliminarily treated (for example, desiliconization or dephosphorization of the molten iron) to increase the zinc concentration in the steelmaking dust.
【０００８】即ち、溶銑に亜鉛含有スクラップを添加す
るのではなく、亜鉛含有スクラップを先に装入後に溶銑
１１を装入することにより、亜鉛含有スクラップに付着
している亜鉛成分（特に金属亜鉛）を炉体顕熱により加
熱して蒸発させ、この溶銑予備処理炉から発生する高濃
度の亜鉛成分（酸化亜鉛）を含む精錬ダストを吸引用フ
ード２ａを介して回収して、製鋼ダストに亜鉛を濃縮せ
しめ、製鋼ダストを亜鉛原料として利用可能にしたもの
である。この結果、回収した精錬ダスト中における亜鉛
濃度は２５％以上、 更に好ましくは４０％以上と高くな
って亜鉛精鉱として利用可能となり、また、溶銑中にス
クラップより溶解残留する亜鉛量も少なくなるため、後
工程の転炉に亜鉛が持ち越されることによる弊害をも解
決することができることとなる。That is, instead of adding zinc-containing scrap to the hot metal, the zinc-containing scrap is charged first and then the hot metal 11 is charged, so that the zinc component (particularly metallic zinc) adhering to the zinc-containing scrap is added. Is heated by the sensible heat of the furnace to evaporate it, and the refining dust containing high-concentration zinc component (zinc oxide) generated from the hot metal pretreatment furnace is collected through the suction hood 2a, and zinc is made into steelmaking dust. It is concentrated to make steelmaking dust available as a zinc raw material. As a result, the zinc concentration in the recovered smelted dust is increased to 25% or more, more preferably 40% or more, so that it can be used as zinc concentrate, and the amount of zinc dissolved and remaining in the hot metal from scrap becomes small. In addition, it is possible to solve the adverse effects caused by carrying over zinc to the converter in the subsequent process.
【０００９】なお、このような予備処理工程において
は、前記した溶銑予備処理炉１が亜鉛含有スクラップ１
０を装入した場合に、亜鉛含有スクラップに付着してい
る金属亜鉛を炉体顕熱により加熱して蒸発させるのに十
分な顕熱を有していることが好ましい。そのためには、
外部からの加熱手段を用いて溶銑予備処理炉１を亜鉛の
昇華温度を超える所定の温度に達するようにしてもよい
が、溶銑の予備処理を複数回好ましくは４回以上連続運
転した後に本発明を実施すれば、外部からの加熱手段が
なくても溶銑予備処理炉１を金属亜鉛の加熱蒸発に十分
な温度とすることができるので一層好ましい。[0009] In such a pretreatment step, the hot metal pretreatment furnace 1 is used for the zinc-containing scrap 1.
When 0 is charged, it is preferable to have sufficient sensible heat to heat and evaporate the metallic zinc adhering to the zinc-containing scrap by the furnace body sensible heat. for that purpose,
The hot metal pretreatment furnace 1 may be heated to a predetermined temperature exceeding the sublimation temperature of zinc by using an external heating means. Is more preferable because the temperature of the hot metal pretreatment furnace 1 can be set to a temperature sufficient for heating and evaporating metallic zinc without any external heating means.
【００１０】また、このようにして得られた精錬ダスト
を、再びフィードバックして溶銑予備処理炉1 中に吹込
むようにすれば、回収されるダスト中における亜鉛濃度
は益々高いものとなり、より濃度の高い高品質で亜鉛一
次精錬業にリサイクル可能な製鋼ダストを得ることが可
能となる。即ち、図２に示されるように、亜鉛含有スク
ラップを装入してある溶銑予備処理炉１に溶銑を装入
後、この溶銑予備処理炉１中に前記した方法により得ら
れた酸化亜鉛を含む精錬ダストを、石灰石および／また
はソーダ灰とともに吹込みノズル５を介して溶銑中に吹
込み、その上方から溶銑の脱珪、脱燐に必要な酸素をラ
ンス４により加えて攪拌し、溶銑の脱珪脱燐処理を行
い、この溶銑予備処理炉１から発生する高濃度化された
亜鉛成分を含む精錬ダストを吸引用フード２ｂを介して
回収して製鋼ダスト中へ亜鉛（金属亜鉛）を濃縮し亜鉛
一次精錬用にリサイクル可能ならしめる。この場合、上
記ダストを窒素等の不活性ガスと石灰石（CaCO3 ）およ
び／またはソーダ灰（Na2CO3）とともに吹込むと、これ
らの物質は溶銑と下記のように反応して多量のCOガスを
発生する。If the refined dust obtained in this way is fed back into the hot metal pretreatment furnace 1 again, the zinc concentration in the recovered dust becomes even higher, and the zinc concentration in the recovered dust becomes higher. It is possible to obtain high quality steelmaking dust that can be recycled to the primary zinc refining industry. That is, as shown in FIG. 2, after the hot metal is charged into the hot metal pretreatment furnace 1 into which the zinc-containing scrap has been charged, the hot metal pretreatment furnace 1 contains the zinc oxide obtained by the above-described method. The refined dust is blown into the hot metal through the blowing nozzle 5 together with limestone and / or soda ash, and oxygen required for desiliconization and dephosphorization of the hot metal is added from above by a lance 4 and stirred to remove the hot metal. Silica dephosphorization treatment is performed, and refined dust containing a highly concentrated zinc component generated from the hot metal pretreatment furnace 1 is collected via a suction hood 2b, and zinc (metal zinc) is concentrated in steelmaking dust. Make it recyclable for primary zinc refining. In this case, when the dust is blown together with an inert gas such as nitrogen and limestone (CaCO 3 ) and / or soda ash (Na 2 CO 3 ), these substances react with hot metal as described below to generate a large amount of CO. Generates gas.
【００１１】[0011]
【化１】 備考：Ｃは溶銑中に溶解したＣを示す。Embedded image Remarks: C indicates C dissolved in hot metal.
【化２】 Embedded image
【００１２】本発明者らの基礎実験によると、ZnO の還
元・蒸発反応はＣによる還元より雰囲気中COガスによる
反応が主であることが判明しており、上記反応で生成し
たCOガスによって下記のようにZnO の還元は促進され
る。According to the basic experiments conducted by the present inventors, it has been found that the reduction / evaporation reaction of ZnO is mainly carried out by CO gas in the atmosphere rather than by reduction by C. Thus, the reduction of ZnO is promoted.
【化３】 備考：(g) はガスを示す。更に、生成したZn (g)蒸気は
COガス気泡中に希薄にしか存在しないため、下記反応式
で示す溶銑中へのZnの溶解は少ない。Embedded image Remark: (g) indicates gas. Furthermore, the generated Zn (g) vapor
Since the CO gas bubbles exist only dilutely, the dissolution of Zn into the hot metal represented by the following reaction formula is small.
【化４】 備考：Znは溶銑中に溶解したZnを示す。Embedded image Remark: Zn indicates Zn dissolved in hot metal.
【００１３】この時、CaCO3 および／またはNa2CO3吹込
み速度を高く保つことによって、固（ダスト粒子）−気
（COガス）−液（溶銑）混相流中のCOガス割合が高く保
たれるとともに、表面のスラグが除去されて裸湯状態と
なる。これによりZn蒸気の溶銑中への溶解、およびスラ
グへのトラップを少なくできるので、金属亜鉛の回収効
率を上げることができるとともに、スラグが亜鉛で汚染
されることもなく再利用上の問題を生じることもなく好
ましい。この結果、酸化亜鉛含有ダストを吹込んでも溶
銑の亜鉛による汚染、即ち溶銑中に亜鉛が残留すること
も抑制されることになる。At this time, by keeping the injection rate of CaCO 3 and / or Na 2 CO 3 high, the proportion of CO gas in the solid (dust particle) -gas (CO gas) -liquid (hot metal) multiphase flow is kept high. At the same time, the slag on the surface is removed, and the hot water is obtained. This reduces the dissolution of Zn vapor in the hot metal and the traps in the slag, thereby increasing the efficiency of recovering zinc metal and causing a problem in recycling without contaminating the slag with zinc. It is not preferred. As a result, even if the zinc oxide-containing dust is blown, contamination of the hot metal by zinc, that is, residual zinc in the hot metal is also suppressed.
【００１４】このように本発明は、溶銑予備処理炉１で
溶銑予備処理を行った後、転炉で脱炭処理を行う鋼の精
錬工程において、予め亜鉛（主として金属亜鉛）を含有
するスクラップを装入してある溶銑予備処理炉１にて亜
鉛含有スクラップ中の金属亜鉛を加熱蒸発させ、その後
に溶銑を装入して、溶銑予備処理炉１から発生する酸化
亜鉛を含む製鋼ダストを回収することにより、亜鉛含有
スクラップから効率的に亜鉛元素の含有率が高い亜鉛一
次精錬業向けにリサイクル可能な製鋼ダストを低ランニ
ングコストで得ることができ、しかも、溶銑１１中に亜
鉛が残らないので、次の脱炭処理を行う転炉に亜鉛元素
( 金属亜鉛およびまたは酸化亜鉛) が持ち込まれること
により生じる弊害を大幅に減らすことができる。更に
は、亜鉛を含有するスクラップと亜鉛を含有しないスク
ラップとを分別することなく使用できるため、選別の費
用も不要となり、また既存の製鋼工程に新たな設備費用
や運転費用等をほとんどかけず僅かに溶銑予備処理炉に
吹込み設備を設けるのみでよいという利点もある。As described above, according to the present invention, in a steel refining process in which hot metal pretreatment is performed in the hot metal pretreatment furnace 1 and then decarburization is performed in a converter, scrap containing zinc (mainly metal zinc) is previously removed. The metallic zinc in the zinc-containing scrap is heated and evaporated in the charged hot metal pretreatment furnace 1, and then hot metal is charged to collect steelmaking dust containing zinc oxide generated from the hot metal pretreatment furnace 1. By doing so, it is possible to efficiently obtain, from the zinc-containing scrap, recyclable steelmaking dust having a high zinc element content for the primary zinc refining industry at a low running cost, and since zinc does not remain in the hot metal 11, Zinc element in converter for next decarburization process
(Metal zinc and / or zinc oxide) can be greatly reduced. Furthermore, since zinc-containing scrap and zinc-free scrap can be used without being separated, there is no need for sorting costs, and the existing steelmaking process requires little new equipment costs and operating costs, etc. Another advantage is that it is only necessary to provide a blowing facility in the hot metal pretreatment furnace.
【００１５】[0015]
【実施例】以下に、本発明の実施例を示す。 ［実施例１］まず、亜鉛含有スクラップ質量２０t を外
部からの加熱手段を用いて９５０℃程度に加熱してある
転炉タイプの溶銑予備処理炉に装入した。この時、ダス
ト補集集塵機を運転し、炉外に吹き上がるダストを回収
し始める。引き続き、溶銑質量２９０t を装入し、炭酸
カルシウムとダストからなる粉体を窒素ガスにより底吹
き羽口より吹込み開始するとともに、生石灰、鉄鉱石等
の精錬剤を添加し、上から酸素ガスを吹付け開始し、溶
銑の脱珪、脱燐処理を６００sec 行った。得られた溶銑
中の珪素、燐は各々質量が0.32% から0.01% 以下に、0.
097%から0.014%に低下した。また、溶銑中の亜鉛濃度は
0.5ppm以下であり、満足に亜鉛元素の分離ができてい
た。そして、ダスト補集集塵機により回収された製鋼ダ
スト中には加熱により蒸発した亜鉛含有スクラップ中の
亜鉛元素が50% と高濃度で含まれており、亜鉛一次精錬
業向けにリサイクル可能な材料であることが確認でき
た。Examples of the present invention will be described below. Example 1 First, a zinc-containing scrap mass of 20 t was charged into a converter type hot metal pretreatment furnace heated to about 950 ° C. using an external heating means. At this time, the dust collecting dust collector is operated to start collecting dust that blows out of the furnace. Subsequently, a hot metal mass of 290 t was charged, powder of calcium carbonate and dust was started to be blown from the bottom blowing tuyere with nitrogen gas, and a refining agent such as quicklime or iron ore was added, and oxygen gas was added from above. Spraying was started and the hot metal was desiliconized and dephosphorized for 600 seconds. The content of silicon and phosphorus in the obtained hot metal decreased from 0.32% to 0.01%, respectively.
It decreased from 097% to 0.014%. The zinc concentration in the hot metal is
It was 0.5 ppm or less, and the zinc element was successfully separated. The steelmaking dust collected by the dust collection dust collector contains a high concentration of 50% of the zinc element in the zinc-containing scrap evaporated by heating, making it a recyclable material for the primary zinc refining industry. That was confirmed.
【００１６】［実施例２］１チャージあたり、スクラッ
プ質量８〜３８t を転炉タイプの溶銑予備処理炉に装入
した。この時、ダスト補集集塵機を運転し、炉外に吹き
上がるダストを回収し始める。１チャージあたり溶銑質
量２６２〜２９１t を装入し、炭酸カルシウムと前工程
で回収した亜鉛成分を含む精錬ダストを窒素ガスととも
に底吹き羽口より吹込みながら、生石灰等の精錬剤を添
加し、上から酸素ガスを吹付け開始し、１チュージあた
り３００〜６００sec 間の脱珪脱燐処理を行った。溶銑
中の初期珪素濃度は0.25〜0.75% 、りん濃度は0.078 〜
0.10% であったが、処理後の珪素濃度は0.01% 以下、り
ん濃度は0.011 〜0.021%、亜鉛濃度0.5ppm以下となり、
また、スラグ中の亜鉛濃度は0.1%以下であった。以上の
工程中ダスト補集集塵機で回収した亜鉛成分を含む精錬
ダストを溶銑予備処理炉にフィードバックさせることを
７回繰り返すことにより、最終的に亜鉛濃度が62% の亜
鉛一次精錬業向けにリサイクル可能な材料が得られた。Example 2 A mass of scrap of 8 to 38 t per charge was charged into a converter type hot metal pretreatment furnace. At this time, the dust collecting dust collector is operated to start collecting dust that blows out of the furnace. A refining agent such as quicklime is added while charging a hot metal mass of 262 to 291 t per charge, and blowing refining dust containing calcium carbonate and a zinc component recovered in the previous step together with nitrogen gas from a bottom blowing tuyere. , A desiliconization dephosphorization treatment was performed for 300 to 600 seconds per tube. Initial silicon concentration in hot metal is 0.25 ~ 0.75%, phosphorus concentration is 0.078 ~
Although it was 0.10%, the silicon concentration after the treatment was 0.01% or less, the phosphorus concentration was 0.011 to 0.021%, the zinc concentration was 0.5 ppm or less,
Further, the zinc concentration in the slag was 0.1% or less. By repeating the refining dust containing zinc components collected by the dust collection and collection device in the above process to the hot metal pretreatment furnace seven times, it can be finally recycled for the zinc primary refining industry with a zinc concentration of 62% Material was obtained.
【００１７】［実施例３］１チャージあたり、スクラッ
プ質量１０〜３７t を転炉タイプの溶銑予備処理炉に装
入した。この時、ダスト補集集塵装置で発生するダスト
をバグフィルターにトラップする。引き続き、１チャー
ジあたり溶銑質量２６８〜３０１t を装入し、炭酸カル
シウムと製鉄ダストと窒素ガスとともに底吹き羽口より
吹込みながら、生石灰等の精錬剤を上方添加し、メイン
ランスから酸素ガスを上吹きして脱珪脱燐処理を４２０
〜６６０sec 間行った。更に、その後、酸素ガス上吹き
停止し、CaO とNa2CO3を85:15 の質量比で混合したフラ
ックスと、前記したバグフィルターにより回収された製
鋼ダストを吹込みながら脱硫処理を３００sec 間行っ
た。前記した脱珪・脱燐処理中のCaCO3 の平均吹込み速
度は1.6kg/s 、脱硫処理中のフラックス吹込み速度は6.
6kg/s 以上であり、またダスト吹込み速度は脱珪・脱燐
処理中が4.6 〜5.0kg/s であった。溶銑の初期珪素、り
ん、硫黄質量濃度は、各々0.35〜0.67% 、0.062 〜0.09
7%、0.01〜0.02% であったが、処理後の溶銑の珪素、り
ん、硫黄、亜鉛質量濃度は、各々0.01% 以下、0.012 〜
0.022%、0.003 〜0.007%、2ppm以下であり、スラグ中の
亜鉛質量濃度は0.1%以下であった。また、バグフィルタ
ーにより回収した製鋼ダストを溶銑予備処理炉にフィー
ドバックさせることを７回繰り返して前記処理を行った
結果、最終的に回収した製鋼ダスト中のZnO 質量濃度は
52% であった。Example 3 A scrap mass of 10 to 37 t per charge was charged into a converter type hot metal pretreatment furnace. At this time, dust generated in the dust collecting and collecting apparatus is trapped in the bag filter. Subsequently, a hot metal mass of 268 to 301 tons per charge is charged, and while refining agents such as quicklime are added upward while blowing in calcium carbonate, ironmaking dust, and nitrogen gas from the bottom blowing tuyere, oxygen gas is raised from the main lance. Blow to desiliconize and dephosphorize 420
間 660 sec. Further, after that, the oxygen gas was stopped from being blown upward, and desulfurization treatment was performed for 300 seconds while blowing a flux in which CaO and Na 2 CO 3 were mixed at a mass ratio of 85:15 and the steelmaking dust collected by the bag filter were blown. Was. The average blowing rate of CaCO 3 during the above-mentioned desiliconization and dephosphorization treatment is 1.6 kg / s, and the flux blowing rate during the desulfurization treatment is 6.
The dust blowing rate was 4.6 to 5.0 kg / s during the desiliconization and dephosphorization treatment. The initial silicon, phosphorus, and sulfur mass concentrations of the hot metal were 0.35 to 0.67% and 0.062 to 0.09, respectively.
7% and 0.01-0.02%, respectively, but the mass concentration of silicon, phosphorus, sulfur and zinc in the hot metal after treatment was 0.01% or less and 0.012-0.02%, respectively.
0.022%, 0.003 to 0.007%, 2 ppm or less, and the zinc mass concentration in the slag was 0.1% or less. In addition, as a result of repeating the above process seven times by feeding back the steelmaking dust collected by the bag filter to the hot metal pretreatment furnace, the ZnO mass concentration in the finally collected steelmaking dust was
52%.
【００１８】[0018]
【発明の効果】本発明は以上の説明からも明らかなよう
に、亜鉛含有スクラップから効率的に亜鉛成分の含有率
が高い亜鉛一次精錬業向けにリサイクル可能な材料を低
ランニングコストで製造でき、しかも精錬中の溶銑中に
亜鉛が残らないので、後工程の転炉に亜鉛成分が持ち込
まれることにより生じる弊害をなくすことができ、更に
は、亜鉛含有スクラップと亜鉛を含有しないスクラップ
とを分別することなく使用できるため、選別の費用も不
要となる。また、既存の精錬工程に新たに設備費用や運
転費用等を殆どかけず、僅かに吹込み設備を追加するの
みでよいという利点もある。よって本発明は効率的に亜
鉛含有スクラップから製鋼ダストに亜鉛を濃縮すること
ができるので、亜鉛一次精錬業向けにリサイクル可能な
材料を得る方法として、産業の発展に寄与するところは
極めて大である。As is apparent from the above description, the present invention can efficiently produce a recyclable material having a high zinc content from a zinc-containing scrap at a low running cost for a zinc primary smelting industry. Moreover, since zinc does not remain in the hot metal during refining, it is possible to eliminate the adverse effects caused by the introduction of zinc components into the converter in the subsequent process, and further separate zinc-free scrap from zinc-free scrap. Since it can be used without any additional cost, sorting costs are unnecessary. In addition, there is also an advantage in that almost no new equipment cost or operation cost is added to the existing refining process, and only a small amount of blowing equipment is required. Therefore, since the present invention can efficiently concentrate zinc from zinc-containing scrap into steelmaking dust, the method of obtaining recyclable materials for the zinc primary smelting industry greatly contributes to industrial development. .
【図１】本発明の実施の形態を示す正面図である。FIG. 1 is a front view showing an embodiment of the present invention.
【図２】その他の実施の形態を示す正面図である。FIG. 2 is a front view showing another embodiment.
１ 溶銑予備処理炉 2a 吸引用フード 2b 吸引用フード ３ スクラップシュート ４ ランス ５ 吹込みノズル ６ ホッパー 10 亜鉛含有スクラップ 11 溶銑 1 Hot Metal Pretreatment Furnace 2a Suction Hood 2b Suction Hood 3 Scrap Chute 4 Lance 5 Blow Nozzle 6 Hopper 10 Zinc-Containing Scrap 11 Hot Metal
───────────────────────────────────────────────────── 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 9/02 Ｃ２２Ｂ 9/02 19/30 19/30 (72)発明者 松本 晃一 愛知県東海市東海町５−３ 新日本製鐵株 式会社名古屋製鐵所内 (72)発明者 今井 正 愛知県東海市東海町５−３ 新日本製鐵株 式会社名古屋製鐵所内 Ｆターム(参考） 4K001 AA30 BA14 BA22 DA05 DA06 GA06 GB09 4K002 AA01 AB02 AC02 AC03 AC05 AD05 BA10 4K014 AD00 AD13 ──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 7 Identification symbol FI Theme coat ゛ (Reference) C22B 9/02 C22B 9/02 19/30 19/30 (72) Inventor Koichi Matsumoto Tokai-cho, Tokai City, Aichi Prefecture 5-3 Nippon Steel Corporation Nagoya Works (72) Inventor Tadashi Imai 5-3 Tokai-cho, Tokai City, Aichi Prefecture F-term in Nippon Steel Corporation Nagoya Works 4K001 AA30 BA14 BA22 DA05 DA06 GA06 GB09 4K002 AA01 AB02 AC02 AC03 AC05 AD05 BA10 4K014 AD00 AD13
Claims (4)
後、転炉で脱炭処理を行う鋼の精錬工程において、予め
亜鉛含有スクラップを装入してある溶銑予備処理炉に
て、亜鉛含有スクラップ中の金属亜鉛を加熱蒸発させ、
その後に溶銑を装入して、溶銑予備処理炉から発生する
亜鉛酸化物を含む製鋼ダストを回収することを特徴とす
る製鋼ダストの亜鉛濃縮方法。In a steel refining process in which a hot metal pretreatment is performed in a hot metal pretreatment furnace and then a decarburization process is performed in a converter, zinc is preliminarily processed in a hot metal pretreatment furnace charged with zinc-containing scrap in advance. Heating and evaporating the metallic zinc in the contained scrap,
Thereafter, hot metal is charged, and steelmaking dust containing zinc oxide generated from the hot metal pretreatment furnace is recovered, whereby a method for enriching zinc in steelmaking dust is provided.
装入する前に予め金属亜鉛の加熱蒸発に十分な温度に溶
銑予備処理炉を加熱しておく請求項１記載の製鋼ダスト
の亜鉛濃縮方法。2. The method for concentrating zinc in steelmaking dust according to claim 1, wherein the hot metal pretreatment furnace is preliminarily heated to a temperature sufficient for heating and evaporating metal zinc before charging the zinc-containing scrap into the hot metal pretreatment furnace. .
予備処理炉に溶銑を装入後、この溶銑予備処理炉に請求
項１または２により得られた亜鉛酸化物を含む製鋼ダス
トを、石灰石および／またはソーダ灰とともに吹込み、
その上方から酸素を加えてこの溶銑予備処理炉から発生
する高濃度化された亜鉛成分を含む製鋼ダストを回収す
ることを特徴とする製鋼ダストの亜鉛濃縮方法。3. A hot metal pretreatment furnace into which zinc-containing scrap has been charged, and then the steelmaking dust containing zinc oxide obtained according to claim 1 or 2 is charged into the hot metal pretreatment furnace with limestone. And / or blow with soda ash,
A method for enriching zinc in steelmaking dust, comprising recovering steelmaking dust containing a highly concentrated zinc component generated from the hot metal pretreatment furnace by adding oxygen from above.
５％以上であることを特徴とする請求項１または請求項
２または請求項３に記載の製鋼ダストの亜鉛濃縮方法。4. The steelmaking dust has a zinc content of 2% by mass.
The method for enriching zinc in steelmaking dust according to claim 1, wherein the concentration is 5% or more. 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000055625A JP3825603B2 (en) | 2000-03-01 | 2000-03-01 | Zinc enrichment method for steelmaking dust |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000055625A JP3825603B2 (en) | 2000-03-01 | 2000-03-01 | Zinc enrichment method for steelmaking dust |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2001240919A true JP2001240919A (en) | 2001-09-04 |
| JP3825603B2 JP3825603B2 (en) | 2006-09-27 |
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ID=18576716
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007009240A (en) * | 2005-06-28 | 2007-01-18 | Kobe Steel Ltd | How to reuse converter dust |
| JP2007177284A (en) * | 2005-12-28 | 2007-07-12 | Jfe Steel Kk | How to use zinc-containing iron scrap in iron making process |
| JP2008031497A (en) * | 2006-07-26 | 2008-02-14 | Jfe Steel Kk | Pretreatment method of hot metal using zinc-containing iron scrap |
| CN112029949A (en) * | 2020-08-05 | 2020-12-04 | 首钢京唐钢铁联合有限责任公司 | Method for treating zinc-containing waste steel by adopting converter full-three-step smelting process |
-
2000
- 2000-03-01 JP JP2000055625A patent/JP3825603B2/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007009240A (en) * | 2005-06-28 | 2007-01-18 | Kobe Steel Ltd | How to reuse converter dust |
| JP2007177284A (en) * | 2005-12-28 | 2007-07-12 | Jfe Steel Kk | How to use zinc-containing iron scrap in iron making process |
| JP2008031497A (en) * | 2006-07-26 | 2008-02-14 | Jfe Steel Kk | Pretreatment method of hot metal using zinc-containing iron scrap |
| CN112029949A (en) * | 2020-08-05 | 2020-12-04 | 首钢京唐钢铁联合有限责任公司 | Method for treating zinc-containing waste steel by adopting converter full-three-step smelting process |
| CN112029949B (en) * | 2020-08-05 | 2022-05-10 | 首钢京唐钢铁联合有限责任公司 | Method for treating zinc-containing waste steel by adopting converter full-three-step smelting process |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3825603B2 (en) | 2006-09-27 |
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