JP2002256322A - Method for operating converter utilizing blend including press-formed scrap of waste car - Google Patents
Method for operating converter utilizing blend including press-formed scrap of waste carInfo
- Publication number
- JP2002256322A JP2002256322A JP2001061406A JP2001061406A JP2002256322A JP 2002256322 A JP2002256322 A JP 2002256322A JP 2001061406 A JP2001061406 A JP 2001061406A JP 2001061406 A JP2001061406 A JP 2001061406A JP 2002256322 A JP2002256322 A JP 2002256322A
- Authority
- JP
- Japan
- Prior art keywords
- scrap
- press
- waste
- car
- molten steel
- 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.)
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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
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、ほぼ原型の使用済
み自動車をプレス成形して得られたプレス成形屑を鉄源
の一部として用い、酸素吹錬により溶鋼を製造する転炉
操業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 operating a converter in which molten steel is produced by oxygen blowing using press-formed waste obtained by press-forming a substantially original used vehicle as a part of an iron source. Things.
【０００２】[0002]
【従来の技術】従来、使用済み自動車はプレス成形さ
れ、Ａプレス屑（３辺の総和が１８００ｍｍ以下のプレ
ス成形屑）としてアーク炉で溶解されていたが、アーク
炉における溶解時の電極折損等の問題から、現状ではプ
レス成形後にシュレッダーマシンにてシュレッダー処理
され、シュレッダー屑としてアーク炉等で溶解されてい
る。当然ではあるが、このシュレッダー屑はプレス成形
屑よりも価格が高く、その価格は１トン当たり１２００
０円〜１５０００円程度となる。2. Description of the Related Art Conventionally, used automobiles were press-formed and melted in an arc furnace as A press waste (a press-formed waste having a total of three sides of 1800 mm or less). Due to the problem described above, at present, after press molding, the paper is shredded by a shredder machine and is melted as shredder waste in an arc furnace or the like. Not surprisingly, this shredder waste is more expensive than press-formed waste, and its price is 1200 per ton.
It will be around 0 yen to 15,000 yen.
【０００３】又、このシュレッダー処理時にプラスチッ
ク、ゴム、鉄、アルミニウム、銅等々が混在したシュレ
ッダーダストが発生する。約１トンの自動車１台のシュ
レッダー処理で約２００ｋｇのシュレッダーダストが発
生しており、このシュレッダーダストは、埋め立て処分
されるか廃棄物焼却炉にて燃焼・溶融処理されている。
しかし、日本国内において使用済み自動車は年間およそ
５００万台にも達しており、埋め立て処分は処分地が限
られることから、高額の処分費用が必要であり、一方、
焼却炉による燃焼処理では、シュレッダーダスト中の灰
分及び金属分が残留し、この処分が問題となっている。In addition, shredder dust containing a mixture of plastic, rubber, iron, aluminum, copper, etc. is generated during the shredding process. About 200 kg of shredder dust is generated by shredding one ton of automobile, and this shredder dust is disposed of in landfill or burned and melted in a waste incinerator.
However, the number of end-of-life vehicles in Japan is about 5 million per year, and landfill disposal is limited, so high disposal costs are required.
In the combustion treatment using an incinerator, ash and metal in the shredder dust remain, and this disposal is a problem.
【０００４】そこで、これらの問題点を解決する１つの
手段として、ほぼ原型の使用済み自動車にプレス成形を
施したものを製鋼用原料として転炉内に直接装入して溶
解する方法が、例えば特開平１０−３３０８２１号公報
等に開示されている。この方法によれば、使用済み自動
車を安価な鉄源として大量にリサイクル処理できるとし
ている。[0004] As one means for solving these problems, there is a method of directly charging a substantially original used vehicle which has been subjected to press forming as a raw material for steelmaking into a converter and melting it. It is disclosed in JP-A-10-330821 and the like. According to this method, used vehicles can be recycled in large quantities as an inexpensive iron source.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、ほぼ原
型の使用済み自動車をプレス成形して得られたプレス成
形屑（以下「廃車プレス屑」とも呼ぶ）には電気配線更
にはモーター等が含まれるため、廃車プレス屑の銅含有
量は高くなる。そのため、廃車プレス屑の配合比率を高
めた場合には、製造される溶鋼中の銅濃度が高くなり、
製品品質上の規格外れとなることがある。従って、製品
の規格に対応して廃車プレス屑の配合比率を決める必要
があるが、廃車プレス屑の銅含有量にはばらつきがあ
り、従来この観点から廃車プレス屑の配合比率を定めた
提案は無く、製品の銅成分規格を越えない範囲でできる
だけ多くの廃車プレス屑を配合する方法が望まれてい
た。However, press-formed waste (hereinafter also referred to as "waste car pressed waste") obtained by press-forming a substantially original used vehicle includes electric wiring and a motor. In addition, the copper content of scrap car scraps increases. Therefore, when the mixing ratio of scrap car scrap is increased, the copper concentration in the molten steel to be produced increases,
The product quality may be out of specification. Therefore, it is necessary to determine the mixing ratio of scrap car press waste in accordance with the product standard.However, there is a variation in the copper content of scrap car press waste. There has been a demand for a method of blending as much scrap car scrap as possible without exceeding the copper component standard of the product.
【０００６】又、転炉では先ず最初に廃車プレス屑を装
入し、その後に溶銑を装入して酸素吹錬を実施している
が、廃車プレス屑の配合比率が高い場合には、溶銑湯面
が廃車プレス屑よりも下側となって溶銑湯面が隠れてし
まったり、又、溶銑湯面直下に廃車プレス屑が存在する
場合が発生する。このような場合には、上吹きランスか
ら酸素を供給しても、酸素と溶銑中の炭素との反応が円
滑に行われず、所謂着火不良によって転炉操業が安定し
ない。この問題を避けるためには、廃車プレス屑の配合
比率に応じて廃車プレス屑の見掛嵩密度を所定値以上に
制御する必要があるが、従来この観点から廃車プレス屑
の見掛嵩密度を配慮した提案はなされていない。尚、廃
車プレス屑を２回以上に分割して転炉内に装入すればこ
の問題は解消するが、廃車プレス屑装入の度に酸素吹錬
を中断しなければならず、転炉の生産性が大幅に低下す
るために現実的ではない。[0006] Further, in the converter, first, waste car press waste is charged, and thereafter, hot metal is charged and oxygen blowing is carried out. In some cases, the molten metal surface is lower than the scrap metal waste and the molten metal surface is hidden, or there is a case where the scrap metal waste is present immediately below the molten metal surface. In such a case, even if oxygen is supplied from the upper blowing lance, the reaction between oxygen and carbon in the hot metal is not performed smoothly, and the operation of the converter is not stable due to so-called poor ignition. In order to avoid this problem, it is necessary to control the apparent bulk density of the scrap car press waste to a predetermined value or more according to the mixing ratio of the scrap car press waste. No thoughtful proposal has been made. In addition, this problem can be solved by dividing the scrap of the scrap car into two or more times and charging the scrap into the converter. However, the oxygen blowing must be interrupted every time the scrap from the scrap car is charged. It is not practical because productivity drops significantly.
【０００７】本発明は上記事情に鑑みなされたもので、
その目的とするところは、使用済み自動車をプレス成形
して得られたプレス成形屑を鉄源の一部として配合し、
酸素吹錬により溶鋼を製造する際に、吹錬開始時の着火
不良がなく、安定した操業が可能であり、且つ、製造さ
れる溶鋼の銅濃度を安定して製品規格以下に維持させる
ことができる転炉操業方法を提供することである。[0007] The present invention has been made in view of the above circumstances,
The purpose is to mix the press-formed waste obtained by press-forming used vehicles as part of the iron source,
When producing molten steel by oxygen blowing, there is no ignition failure at the start of blowing, stable operation is possible, and it is possible to stably maintain the copper concentration of the produced molten steel below the product standard. To provide a possible converter operating method.
【０００８】[0008]
【課題を解決するための手段】本発明者等は、上記課題
を解決するために鋭意検討を行った、以下に検討結果を
説明する。Means for Solving the Problems The present inventors have made intensive studies to solve the above-mentioned problems, and the results of the studies will be described below.
【０００９】容量が２５０トンの転炉を用い、高炉から
出銑された溶銑と通常の鉄スクラップと使用済み自動車
をほぼ原型のままプレス成形した廃車プレス屑とを鉄源
として転炉内に装入し、廃車プレス屑の配合比率Ｒ
（％）を変化させて、製造される溶鋼の銅含有量に及ぼ
す廃車プレス屑の配合比率Ｒの影響を調査する試験操業
を実施した。用いた廃車プレス屑の見掛嵩密度はおよそ
１１００ｋｇ／ｍ3 であり、又、鉄スクラップは、連続
鋳造鋳片のクロップや圧延クロップ等の製鉄所内で発生
する屑であり、所謂市中屑と呼ばれるものではない。こ
こで、廃車プレス屑の配合比率Ｒとは、転炉内に装入し
た溶銑、鉄スクラップ、及び廃車プレス屑の質量の総和
に対する廃車プレス屑の質量の比を百分率で表示したも
のであり、溶銑配合比率及び鉄スクラップ配合比率も同
様にして表示される。A converter having a capacity of 250 tons is used, and the hot metal discharged from the blast furnace, the ordinary iron scrap, and the scrap scraps obtained by press-forming the used automobile almost in the original form are mounted in the converter as an iron source. And mix ratio R of scrap scrap from scrap car
(%), A test operation was carried out to investigate the effect of the mixing ratio R of scrap car scrap on the copper content of the molten steel to be produced. The apparent bulk density of the used scrap car scrap used is about 1100 kg / m 3 , and iron scrap is scrap generated in steelworks such as continuous cast slab crops and rolled crops. Not what is called. Here, the mixing ratio R of scrap car press waste is a percentage of the mass of scrap car press waste to the sum of the masses of hot metal, iron scrap, and scrap car press waste charged in the converter, The hot metal mixing ratio and the iron scrap mixing ratio are displayed in the same manner.
【００１０】調査結果を図１に示す。図１に示すよう
に、溶鋼の銅含有量は、廃車プレス屑を配合しない場合
には０．０１mass％程度であるが、廃車プレス屑の配合
比率Ｒの増加に比例して増加する。又、廃車プレス屑の
配合比率Ｒの増加に伴って溶鋼の銅含有量のばらつきは
大きくなる。これは、廃車プレス屑に含まれる銅成分が
一定しないためである。FIG. 1 shows the results of the investigation. As shown in FIG. 1, the copper content of the molten steel is about 0.01 mass% when no scrap scrap is mixed, but increases in proportion to an increase in the mixing ratio R of scrap scrap. Further, the variation in the copper content of the molten steel increases with an increase in the mixing ratio R of the scrap scrap from the scrap car. This is because the copper component contained in the scrap car scrap is not constant.
【００１１】しかしながら、廃車プレス屑の配合に伴う
溶鋼の銅含有量の増加分を図１に示す最大値で捉えてお
けば、それ以上に銅含有量が増加することはない。廃車
プレス屑の配合に伴う溶鋼の銅含有量の最大値と廃車プ
レス屑の配合比率Ｒとの関係を図１から求めると、下記
の（３）式が得られた。但し、（３）式における［mass
％Ｃｕ］は製造された溶鋼の銅含有量である。However, if the increase in the copper content of the molten steel due to the blending of the scrap scrap from the scrap car is captured by the maximum value shown in FIG. 1, the copper content does not increase further. When the relationship between the maximum value of the copper content of molten steel due to the mixing of scrap car press waste and the mixing ratio R of scrap car press waste was determined from FIG. 1, the following equation (3) was obtained. However, [mass in equation (3)
% Cu] is the copper content of the produced molten steel.
【００１２】[0012]
【数１】 (Equation 1)
【００１３】従って、（３）式から算出される銅含有量
（［mass％Ｃｕ］）が溶鋼の銅成分規格Ｘ（mass％）よ
りも小さければ、廃車プレス屑を配合しても溶鋼の銅成
分規格を満足させることができる。即ち、下記の（１）
式を満足する範囲内の配合比率Ｒで廃車プレス屑を配合
すれば、溶鋼の銅成分規格を満足させることができると
の知見を得た。Therefore, if the copper content ([mass% Cu]) calculated from the equation (3) is smaller than the copper content standard X (mass%) of the molten steel, the copper content of the molten steel can be increased even if scrap car scrap is mixed. The component specification can be satisfied. That is, the following (1)
It has been found that if scrap car scrap is blended at a blending ratio R within a range satisfying the formula, the copper component standard of molten steel can be satisfied.
【００１４】[0014]
【数２】 (Equation 2)
【００１５】又、上記転炉における試験操業において、
廃車プレス屑の配合比率Ｒ（％）と廃車プレス屑の見掛
嵩密度ρ（kg／m3）とを変化させ、これらの吹錬開始時
における着火不良発生に及ぼす影響を調査した。廃車プ
レス屑の見掛嵩密度ρは、プレス成形時のプレス方向及
びプレス力を調整して変化させた。In the test operation in the converter,
The mixing ratio R (%) of the scrap car press waste and the apparent bulk density ρ (kg / m 3 ) of the scrap car press waste were changed, and the effect of these on ignition occurrence at the start of blowing was investigated. The apparent bulk density ρ of scrap car press waste was changed by adjusting the pressing direction and pressing force during press forming.
【００１６】通常の鉄スクラップの見掛嵩密度は真密度
である７８００ｋｇ／ｍ3 に近い値であるが、廃車プレ
ス屑の見掛嵩密度は、プレス成形方向が自動車の天井方
向からの１方向の場合には４００〜５００ｋｇ／ｍ3 程
度の低い値となり、プレス方向を変えてプレス回数を増
すことにより見掛嵩密度は増加する。しかし、製鉄所内
で発生する通常の鉄スクラップに比べるとその見掛嵩密
度は極めて小さい。The apparent bulk density of ordinary iron scrap is a value close to the true density of 7800 kg / m 3 , but the apparent bulk density of scrap car scraps is determined by pressing the scrap in one direction from the ceiling direction of the automobile. In the case of the above, the value becomes as low as about 400 to 500 kg / m 3 , and the apparent bulk density increases by changing the pressing direction and increasing the number of presses. However, the apparent bulk density is extremely small as compared with ordinary steel scrap generated in steel works.
【００１７】調査結果を図２に示す。図２において、●
印は、吹錬開始時に着火不良が発生せず、安定した吹錬
が可能であった試験であり、一方、○印は、吹錬開始時
に着火不良が発生し、安定操業が不可能であった試験で
ある。FIG. 2 shows the results of the investigation. In FIG. 2, ●
The mark indicates that no ignition failure occurred at the start of blowing and stable blowing was possible.On the other hand, the mark indicates that ignition failed at the start of blowing and stable operation was impossible. Test.
【００１８】見掛嵩密度が４００ｋｇ／ｍ3 程度の廃車
プレス屑を用いた場合には、図２に示すように、廃車プ
レス屑の配合比率Ｒが５％以上になると着火不良が発生
した。これは、転炉内の溶銑湯面位置と廃車プレス屑の
上面位置との差が無くなってしまうこと、若しくは、転
炉内の溶銑湯面位置よりも廃車プレス屑の上面位置の方
が高くなってしまうことに起因して発生する。従って、
廃車プレス屑の配合比率Ｒを５％以上とする場合には、
廃車プレス屑の見掛嵩密度を増加させる必要がある。こ
の場合に、廃車プレス屑は溶銑上に浮かんでいるわけで
はなく、廃車プレス屑中の空間に溶銑が充填された状態
となっている。In the case where waste car press waste having an apparent bulk density of about 400 kg / m 3 was used, as shown in FIG. 2, poor ignition occurred when the mixing ratio R of the waste car press waste was 5% or more. This is because there is no difference between the position of the hot metal surface in the converter and the upper surface position of the scrap metal scrap, or the upper surface position of the scrap metal press waste is higher than the position of the hot metal surface in the converter. This occurs due to Therefore,
When the mixing ratio R of scrap car press waste is set to 5% or more,
It is necessary to increase the apparent bulk density of scrap car scrap. In this case, the scrap scrap from the scrap car is not floating on the hot metal, but the space in the scrap scrap from the scrap car is filled with the hot metal.
【００１９】本発明者等は、図２に示す結果から着火不
良発生の有無における廃車プレス屑の見掛嵩密度ρと廃
車プレス屑の配合比率Ｒとの関係として下記の（４）式
を定めた。Based on the results shown in FIG. 2, the present inventors have determined the following equation (4) as the relationship between the apparent bulk density ρ of scrap car waste and the mixing ratio R of scrap car waste in the presence or absence of ignition failure. Was.
【００２０】[0020]
【数３】 (Equation 3)
【００２１】従って、廃車プレス屑の配合比率Ｒに対し
て廃車プレス屑の見掛嵩密度ρが（４）式で示される境
界線よりも大きければ、吹錬開始時の着火不良を防止す
ることができる。即ち、廃車プレス屑の見掛嵩密度ρを
配合比率Ｒに対して下記の（２）式を満足する範囲内と
することで、吹錬開始の着火不良を防止することができ
るとの知見を得た。Therefore, if the apparent bulk density ρ of the scrap car press waste is larger than the boundary line represented by the formula (4) with respect to the mixing ratio R of the scrap car press waste, it is possible to prevent poor ignition at the start of blowing. Can be. That is, it has been found that by setting the apparent bulk density ρ of scrap car press waste within the range satisfying the following expression (2) with respect to the mixing ratio R, it is possible to prevent ignition failure at the start of blowing. Obtained.
【００２２】[0022]
【数４】 (Equation 4)
【００２３】但し、廃車プレス屑の見掛嵩密度ρが４０
０ｋｇ／ｍ3 未満の場合には、転炉への装入の際に一般
的に用いられているスクラップ装入シュートに所定量の
廃車プレス屑が装入できない。又、廃車プレス屑のハン
ドリングが煩雑化して能率が低下する。そのため、本発
明では廃車プレス屑の見掛嵩密度ρの下限値を４００ｋ
ｇ／ｍ3 とした。尚、併用した通常の鉄スクラップは、
銅含有量が少ないために製造される溶鋼の銅成分に及ぼ
す影響は全くなく、又、見掛嵩密度が高いために溶銑中
に沈んでおり、着火不良に及ぼす影響も無視することが
できた。However, the apparent bulk density ρ of the scrap waste from scrap car is 40
If it is less than 0 kg / m 3 , a predetermined amount of scrap scrap from a scrap car cannot be charged into a scrap charging chute generally used for charging the converter. In addition, handling of waste car press waste becomes complicated and efficiency is reduced. For this reason, in the present invention, the lower limit of the apparent bulk density ρ
g / m 3 . In addition, the usual iron scrap used together,
Due to the low copper content, there is no effect on the copper component of the molten steel produced, and because of its high apparent bulk density, it sinks in the hot metal, and its effect on poor ignition can be neglected .
【００２４】本発明は上記知見に基づきなされたもの
で、本発明による、使用済み自動車のプレス成形屑を配
合した転炉操業方法は、先ず最初に使用済み自動車をプ
レス成形して得られたプレス成形屑を装入し、次いで溶
銑を装入し、その後に酸素を供給して転炉内で溶鋼を製
造するに際し、前記プレス成形屑の配合比率Ｒ（％）を
製造される溶鋼の銅成分規格Ｘ（mass％）に対して上記
の（１）式を満足する範囲内にすると共に、前記プレス
成形屑の見掛嵩密度ρ（kg／m3）を４００ｋｇ／ｍ3 以
上で、且つ、プレス成形屑の配合比率Ｒに対して上記の
（２）式を満足する範囲内とすることを特徴とするもの
である。The present invention has been made on the basis of the above-described findings. The method of operating a converter in which press-molded waste of a used vehicle is blended according to the present invention provides a press machine obtained by first press-forming a used vehicle. When the molding waste is charged, and then the molten iron is charged, and then oxygen is supplied to produce molten steel in the converter, the copper component of the molten steel for which the mixing ratio R (%) of the press molding waste is produced With respect to the standard X (mass%), the above expression (1) is satisfied and the apparent bulk density ρ (kg / m 3 ) of the press-formed waste is 400 kg / m 3 or more, and The present invention is characterized in that the mixing ratio R of the press-formed waste is within a range that satisfies the expression (2).
【００２５】[0025]
【発明の実施の形態】以下、本発明の実施の形態につい
て説明する。解体及び分別回収を行うことなく、ほぼ原
型の使用済み自動車をプレス成形して、見掛嵩密度が４
００ｋｇ／ｍ 3 以上である廃車プレス屑とする。見掛嵩
密度は、プレス後の外形寸法とその質量とにより容易に
算出することができる。BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described.
Will be explained. Nearly original without dismantling and separate collection
Press molding of a used car with a mold has an apparent bulk density of 4
00kg / m Three The scrap car scraps mentioned above are referred to as scrap car scraps. Apparent bulk
Density is easily determined by the external dimensions and mass after pressing.
Can be calculated.
【００２６】プレス成形の前に、タイヤやガソリンタン
ク等の溶解時に大量の発煙を伴う部品は予め取り除いて
おく。タイヤやガソリンタンク等の多発煙部品を取り除
かずに鉄スクラップ代替として使用した場合には、大量
の発煙により、既設集塵機の増強や転炉装入側での新た
な集塵機の設置、更には上吹きランスからの送酸速度の
低減化等を余儀なくされ、転炉操業を著しく阻害し、鉄
スクラップの代替として廃車プレス屑を利用するメリッ
トを失してしまう。但し、ワイパー等のゴム状物質や内
装材の樹脂状物質等のように、発煙を伴うもののその程
度が少ない部品は取り除く必要はない。Prior to press molding, parts that emit a large amount of smoke when melting, such as tires and gasoline tanks, are removed in advance. If used as a substitute for iron scrap without removing tires, gasoline tanks, and other high smoke parts, a large amount of smoke would cause the existing dust collectors to be strengthened, new dust collectors to be installed on the converter charging side, and top blowing The rate of acid feed from the lance must be reduced, etc., which significantly impairs the operation of the converter and loses the advantage of using scrap scraps from scrap car as an alternative to iron scrap. However, it is not necessary to remove parts that generate smoke but have a small degree of smoke, such as rubber-like substances such as wipers and resin-like substances of interior materials.
【００２７】又、転炉装入時の爆発防止の観点から、プ
レス成形の前に使用済み自動車中のガソリン、オイル、
冷却水等の液体を抜き取ると共に、ラジエーター等の密
閉部を開放しておくことが好ましい。更に、資源の有効
活用の観点から、バッテリーやラジエター等の部品及び
アルミニウムや銅等の有価金属からなる部品を回収した
後にプレス成形することが好ましい。Further, from the viewpoint of preventing explosion at the time of charging the converter, gasoline, oil, and the like in the used vehicle before press molding are used.
It is preferable to drain a liquid such as cooling water and to open a sealed portion such as a radiator. Further, from the viewpoint of effective utilization of resources, it is preferable to press-mold after collecting components such as batteries and radiators and components made of valuable metals such as aluminum and copper.
【００２８】前述したように、吹錬開始時の着火不良を
防止するためには廃車プレス屑の見掛嵩密度ρを廃車プ
レス屑の配合比率Ｒに応じて所定の値以上とする必要が
あるので、プレス成形の際に、プレス成形により得られ
る廃車プレス屑の見掛嵩密度をどの程度にするかを予め
決めてプレス成形することが好ましい。配合比率Ｒが５
％以下と低く、廃車プレス屑の見掛嵩密度ρが４００〜
５００ｋｇ／ｍ3 程度で構わない場合には、自動車の天
井方向からの１回のプレス成形で十分である。一方、配
合比率Ｒが８％程度と高い場合には、廃車プレス屑の見
掛嵩密度ρを１１００ｋｇ／ｍ3 以上にする必要があ
り、この場合には、直交する３方向からプレス成形し、
廃車プレス屑の形状も直方体状や立方体状にする必要が
ある。このように、廃車プレス屑の配合比率Ｒに応じて
プレス成形することが好ましい。As described above, in order to prevent poor ignition at the start of blowing, the apparent bulk density ρ of scrap car waste must be at least a predetermined value in accordance with the mixing ratio R of scrap car waste. Therefore, at the time of press molding, it is preferable to determine in advance how much the apparent bulk density of the scrap car press waste obtained by press molding is to be and press-molded. Mixing ratio R is 5
% Or less, and the apparent bulk density ρ of scrap car scrap is 400 ~
In the case where about 500 kg / m 3 is sufficient, one press molding from the direction of the ceiling of the automobile is sufficient. On the other hand, when the mixing ratio R is as high as about 8%, the apparent bulk density ρ of the scrap car scrap must be 1100 kg / m 3 or more. In this case, press forming is performed from three orthogonal directions.
It is necessary that the shape of the scrap scrap from the scrap car also has a rectangular parallelepiped shape or a cubic shape. Thus, it is preferable to press-mold according to the mixing ratio R of scrap car press waste.
【００２９】廃車プレス屑の配合比率Ｒ（％）は、製造
される溶鋼の銅成分規格Ｘ（mass％）に応じて前述した
（１）式の範囲内とする。そして、（１）式により定め
た配合比率Ｒ（％）に応じて、前述した（２）式を満足
する見掛嵩密度ρ（kg／m3）を有する廃車プレス屑を使
用する。配合用として準備した廃車プレス屑の見掛嵩密
度が低く、（１）式により算出した配合比率Ｒでは
（２）式を満足しない場合には、準備した廃車プレス屑
の見掛嵩密度でも（２）式が満足されるまで配合比率Ｒ
を下げ、この配合比率Ｒを基準値として採用し、この配
合比率Ｒを越えない範囲で廃車プレス屑を配合すること
とする。The mixing ratio R (%) of the scrap scrap from the scrap car is set in the range of the above-described formula (1) according to the copper component standard X (mass%) of the molten steel to be manufactured. Then, waste car press waste having an apparent bulk density ρ (kg / m 3 ) satisfying the above-mentioned equation (2) is used according to the mixing ratio R (%) determined by the equation (1). If the apparent bulk density of the scrap car press waste prepared for compounding is low and the mixing ratio R calculated by the formula (1) does not satisfy the formula (2), the apparent bulk density of the prepared scrap car press waste also becomes ( 2) Mixing ratio R until formula is satisfied
And the mixing ratio R is adopted as a reference value, and the scrap scrap from the scrap car is mixed within a range not exceeding the mixing ratio R.
【００３０】基準値として定めた配合比率Ｒに基づく所
定量の廃車プレス屑をスクラップ装入シュートに積載さ
せ、転炉を斜めに傾動させた状態で廃車プレス屑を転炉
内に装入する。スクラップ装入シュートは特別な仕様は
必要なく、慣用のスクラップ装入シュートで十分であ
る。廃車プレス屑と共に製鉄所で発生する通常の鉄スク
ラップを鉄源として装入しても良い。次いで、溶銑を転
炉内に装入し、且つ、必要に応じて生石灰等のフラック
スを装入し、上吹きランス若しくは底吹き羽口から酸素
を炉内に供給して酸素吹錬を開始する。A predetermined amount of waste scrap from a scrap car based on the blending ratio R determined as a reference value is loaded on a scrap loading chute, and the scrap waste from the scrap car is loaded into the converter with the converter tilted obliquely. No special specifications are required for the scrap charging chute, and a conventional scrap charging chute is sufficient. Ordinary iron scrap generated at an ironworks together with scrap car scrap may be charged as an iron source. Next, the molten iron is charged into the converter, and if necessary, a flux such as quicklime is charged, and oxygen is supplied into the furnace from the top blowing lance or the bottom blowing tuyere to start oxygen blowing. .
【００３１】この酸素吹錬に伴う脱炭反応により溶湯温
度が上昇し、廃車プレス屑及び通常の鉄スクラップは溶
解され、溶鋼が製造される。脱炭反応が進行して溶鋼中
の炭素含有量が所定の値になったなら酸素の供給を停止
して、製造された溶鋼を取鍋等の収容容器に出湯する。The temperature of the molten metal rises due to the decarburization reaction accompanying the oxygen blowing, and the scrap scrap from the scrap car and ordinary iron scrap are melted to produce molten steel. When the decarburization reaction progresses and the carbon content in the molten steel reaches a predetermined value, the supply of oxygen is stopped, and the produced molten steel is poured into a container such as a ladle.
【００３２】このようにして転炉操業を行うことによ
り、使用済み自動車をプレス成形して得られたプレス成
形屑を鉄源の一部として配合しても、吹錬開始時の着火
不良を防止することができ、且つ、製造される溶鋼の銅
濃度を安定して製品規格以下に維持させることができ、
安定した転炉操業を継続させることが可能となる。By performing the converter operation in this way, even if press-formed waste obtained by press-forming a used automobile is mixed as a part of an iron source, poor ignition at the start of blowing can be prevented. And the copper concentration of the molten steel to be produced can be stably maintained below the product standard,
It is possible to continue stable converter operation.
【００３３】[0033]
【実施例】容量が２５０トンで、上吹きランスから酸素
を上吹きし、攪拌用ガスを底吹きする上底吹き複合吹錬
用転炉を用いた本発明の実施例を説明する。用いた廃車
プレス屑は、外形寸法がおよそ９００ｍｍ（高さ）×９
００ｍｍ（幅）×１５００ｍｍ（長さ）、一個の平均重
量が８１０ｋｇであり、見掛嵩密度は６６０ｋｇ／ｍ3
であった。An embodiment of the present invention will be described in which a 250-ton capacity blow-up lance is used to blow up oxygen from a top-blowing lance and blow bottom gas with stirring gas. The used scrap car scrap used has an external dimension of approximately 900 mm (height) x 9
00 mm (width) x 1500 mm (length), the average weight of one piece is 810 kg, and the apparent bulk density is 660 kg / m 3
Met.
【００３４】溶鋼の銅成分規格Ｘは０．０５５mass％で
あり、この場合、溶鋼の銅成分規格Ｘを満足するための
廃車プレス屑の配合比率Ｒを前述した（１）式により求
めると、配合比率Ｒは６．２％以下にする必要があっ
た。一方、見掛嵩密度が６６０ｋｇ／ｍ3 の条件から、
着火不良を発生させないための配合比率Ｒを（２）式に
より算出すると、配合比率Ｒは５．８％以下にする必要
があった。The copper content standard X of the molten steel is 0.055 mass%. In this case, the mixing ratio R of scrap car scrap to satisfy the copper content standard X of the molten steel is obtained by the above-mentioned equation (1). The ratio R had to be 6.2% or less. On the other hand, from the condition that the apparent bulk density is 660 kg / m 3 ,
When the compounding ratio R for preventing the occurrence of ignition failure was calculated by the equation (2), the compounding ratio R had to be 5.8% or less.
【００３５】そこで、廃車プレス屑を１７個、質量にし
て１３．７トンを、スクラップ装入シュートを介して転
炉内に装入し、その後、２４０トンの溶銑を転炉内に装
入した。この場合の廃車プレス屑の配合比率は５．４％
となり、溶鋼の銅成分規格を満足し且つ着火不良の発生
しない条件をも満足する。Therefore, 17 scraps of scrap car scrap and a mass of 13.7 tons were charged into the converter through a scrap charging chute, and then 240 tons of hot metal was charged into the converter. . In this case, the mix ratio of scrap scrap from scrap car is 5.4%
Satisfies the condition of satisfying the copper component standard of the molten steel and preventing the occurrence of poor ignition.
【００３６】溶銑装入後、上吹きランスから最大５００
００Ｎｍ3 ／ｈｒの送酸速度で酸素を供給して吹錬を実
施した。吹錬開始時に着火不良は発生せず、安定した吹
錬が可能であった。そして、この吹錬により廃車プレス
屑は溶解して、炭素含有量が０．０４mass%、その温度
が１６３０℃の溶鋼約２４０トンを製造した。製造され
た溶鋼の銅含有量は０．０３９mass％であり、十分に銅
成分規格を満足していた。After charging the hot metal, a maximum of 500
Blowing was performed by supplying oxygen at an acid feed rate of 00 Nm 3 / hr. No ignition failure occurred at the start of blowing, and stable blowing was possible. Then, the scrap scrap from the scrap car was melted by this blowing to produce about 240 tons of molten steel having a carbon content of 0.04 mass% and a temperature of 1630 ° C. The copper content of the produced molten steel was 0.039 mass%, which sufficiently satisfied the copper component standard.
【００３７】[0037]
【発明の効果】本発明によれば、使用済み自動車をプレ
ス成形して得られた廃車プレス屑を鉄源の一部として使
用する際に、溶鋼の銅成分規格に応じて廃車プレス屑の
配合比率を定めると共に、廃車プレス屑の配合比率に応
じてプレス成形屑の見掛嵩密度を定めているので、吹錬
開始時の着火不良がなく、安定した操業が可能であり、
且つ、製造される溶鋼の銅濃度を安定して製品規格以下
に維持させることができ、製造コストの削減等の工業上
有益な効果がもたらされる。According to the present invention, when waste car press waste obtained by press-forming a used automobile is used as a part of an iron source, the waste car press waste is mixed according to the copper component standard of molten steel. In addition to determining the ratio, the apparent bulk density of the press forming waste is determined according to the blending ratio of the scrap car press waste, so that there is no ignition failure at the start of blowing and stable operation is possible,
In addition, the copper concentration of the molten steel to be manufactured can be stably maintained at or below the product standard, and industrially beneficial effects such as reduction of manufacturing cost can be brought about.
【図１】溶鋼の銅含有量に及ぼす廃車プレス屑の配合比
率の影響を示す図である。FIG. 1 is a view showing the effect of the mixing ratio of scrap scrap from scrap car on the copper content of molten steel.
【図２】着火不良に及ぼす廃車プレス屑の配合比率並び
に廃車プレス屑の見掛嵩密度の影響を示す図である。FIG. 2 is a diagram showing the influence of the mixing ratio of waste car press waste and the apparent bulk density of waste car press waste on poor ignition.
Claims (1)
して得られたプレス成形屑を装入し、次いで溶銑を装入
し、その後に酸素を供給して転炉内で溶鋼を製造するに
際し、前記プレス成形屑の配合比率Ｒ（％）を製造され
る溶鋼の銅成分規格Ｘ（mass％）に対して下記の（１）
式を満足する範囲内にすると共に、前記プレス成形屑の
見掛嵩密度ρ（kg／m3）を４００ｋｇ／ｍ3 以上で、且
つ、プレス成形屑の配合比率Ｒに対して下記の（２）式
を満足する範囲内とすることを特徴とする、使用済み自
動車のプレス成形屑を配合した転炉操業方法。 Ｒ≦Ｘ／０．００６９−１．７４ …（１） ρ≧２００Ｒ−５００ …（２）1. Firstly, press-formed waste obtained by press-forming a used automobile is charged, then hot metal is charged, and then oxygen is supplied to produce molten steel in a converter. The mixing ratio R (%) of the press shavings is expressed by the following (1) with respect to the copper component standard X (mass%) of the molten steel to be manufactured.
In addition to making the expression satisfy the range, the apparent bulk density ρ (kg / m 3 ) of the press-formed waste is 400 kg / m 3 or more, and the following ratio (2) A method for operating a converter containing press-formed scraps of used automobiles, characterized in that the range is satisfied. R ≦ X / 0.0069-1.74 (1) ρ ≧ 200R-500 (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001061406A JP4547815B2 (en) | 2001-03-06 | 2001-03-06 | Converter operation method containing press molding scraps of used automobiles |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001061406A JP4547815B2 (en) | 2001-03-06 | 2001-03-06 | Converter operation method containing press molding scraps of used automobiles |
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| Publication Number | Publication Date |
|---|---|
| JP2002256322A true JP2002256322A (en) | 2002-09-11 |
| JP4547815B2 JP4547815B2 (en) | 2010-09-22 |
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ID=18920707
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001061406A Expired - Fee Related JP4547815B2 (en) | 2001-03-06 | 2001-03-06 | Converter operation method containing press molding scraps of used automobiles |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10330820A (en) * | 1997-06-03 | 1998-12-15 | Sumitomo Metal Ind Ltd | Operation using waste car scrap in converter |
-
2001
- 2001-03-06 JP JP2001061406A patent/JP4547815B2/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10330820A (en) * | 1997-06-03 | 1998-12-15 | Sumitomo Metal Ind Ltd | Operation using waste car scrap in converter |
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| Publication number | Publication date |
|---|---|
| JP4547815B2 (en) | 2010-09-22 |
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