JPS6389429A - Method for extracting residual pig iron by multi-stage open hole - Google Patents
Method for extracting residual pig iron by multi-stage open holeInfo
- Publication number
- JPS6389429A JPS6389429A JP23448386A JP23448386A JPS6389429A JP S6389429 A JPS6389429 A JP S6389429A JP 23448386 A JP23448386 A JP 23448386A JP 23448386 A JP23448386 A JP 23448386A JP S6389429 A JPS6389429 A JP S6389429A
- Authority
- JP
- Japan
- Prior art keywords
- diameter
- pig iron
- drill bit
- furnace
- hole
- 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
- 229910000805 Pig iron Inorganic materials 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 11
- 238000002844 melting Methods 0.000 claims abstract description 14
- 230000008018 melting Effects 0.000 claims abstract description 14
- 239000011490 mineral wool Substances 0.000 claims abstract description 11
- 239000002893 slag Substances 0.000 claims description 19
- 238000005553 drilling Methods 0.000 claims description 15
- 239000000203 mixture Substances 0.000 claims description 8
- 239000012768 molten material Substances 0.000 claims description 7
- 229920000742 Cotton Polymers 0.000 claims description 6
- 238000000605 extraction Methods 0.000 claims description 6
- 239000002994 raw material Substances 0.000 abstract description 10
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 3
- 238000001816 cooling Methods 0.000 abstract description 3
- 229910052757 nitrogen Inorganic materials 0.000 abstract 1
- 239000000463 material Substances 0.000 description 6
- 238000007599 discharging Methods 0.000 description 5
- 239000004575 stone Substances 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 210000002268 wool Anatomy 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000011400 blast furnace cement Substances 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/12—Opening or sealing the tap holes
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture, Treatment Of Glass Fibers (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は高炉より出滓するスラグな溶融炉に装入し、成
分調整および加熱溶融したのち、溶融物を製綿機に排出
してロックウールを製造する溶融炉の作業において、炉
底部に沈降する銑鉄を抜取る方法に関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention involves charging slag from a blast furnace into a melting furnace, adjusting its composition, heating and melting it, and then discharging the molten material to a cotton mill and locking it. This invention relates to a method for removing pig iron that settles at the bottom of a melting furnace for producing wool.
製鉄所の高炉から多量に副生ずる高温の溶融状スラグは
、これを水で急冷破砕して水滓スラグに加工したものが
、高炉セメント、セメント混合材、地盤改良材、コンク
リート骨材等に利用されている。また、溶融状スラグを
広大な敷地に放流し、冷却してスラグ砕石（徐冷スラグ
）に加工したものか、路盤材、骨材、埋立資材等のほか
に、ロックウール原料として利用されている。High-temperature molten slag, which is a large amount of by-product from blast furnaces at steel plants, is quenched and crushed with water and processed into slag slag, which is used for blast furnace cement, cement mixtures, ground improvement materials, concrete aggregates, etc. has been done. In addition, molten slag is discharged onto a vast site, cooled, and processed into crushed slag (slow-cooled slag), which is used as a raw material for rock wool in addition to roadbed materials, aggregates, and landfill materials. .
ロックウールの製造は、スラブ砕石に必要に応じて成分
調整材を添加して電気炉、キュポラ等の溶融炉で再溶融
し、溶融物を製綿機に供給し、遠心力及び／又は圧力空
気、スチーム等の流体圧力て繊維化する方法が採られて
いる。この従来方法はスラグ砕石を使用するので、原料
の輸送や貯蔵に便利であり、またロックウール原料の化
学成分調整をしやすいか、高炉から持ち出した莫大な熱
量を放冷時に放出して利用できず、廃棄している結果と
なっている。Rock wool is produced by adding component adjustment materials to crushed stone slabs as necessary and remelting them in a melting furnace such as an electric furnace or cupola. , a method of forming fibers using fluid pressure such as steam has been adopted. This conventional method uses crushed slag stone, so it is convenient for transporting and storing the raw material, and it is also easy to adjust the chemical composition of the rock wool raw material, and the huge amount of heat taken out of the blast furnace can be released and used when cooling. As a result, they are being discarded.
そこて省エネルギーの観点より高炉からの高温溶融スラ
グな電気炉に直接装入し、成分調整した後、製綿機に供
給する方法が注目されている０例えば、特公昭３７−４
５５９号公報、特開昭５１−８４９２９号公報、特開昭
５９−１３１５３４号公報等に記載されている。Therefore, from the viewpoint of energy saving, a method of directly charging high-temperature molten slag from a blast furnace into an electric furnace, adjusting its composition, and then feeding it to a cotton mill is attracting attention.
It is described in JP-A No. 559, JP-A-51-84929, JP-A-59-131534, and the like.
前者のキュポラ等によるスラグ砕石を使用する方法では
、回分式の場合には高炉スラグ中の残銑か炉底に貯った
時、製綿機への排出に先立って排出すればよく鉄分の除
去はそれ程技術的問題となっていなかった。特にロック
ウール原料溶融物を溶融炉の上端より炉を傾けて排出す
るような場合には、底部に貯る残銑は大量に貯った時に
排出すればよくこれもそれ程問題となっていなかった。In the former method, which uses slag crushed stone using a cupola, etc., in the case of a batch method, the iron content in the blast furnace slag that accumulates at the bottom of the furnace can be removed by discharging it before discharging it to the cotton mill. It wasn't that much of a technical problem. In particular, when the rock wool raw material melt was discharged from the top of the melting furnace by tilting the furnace, the residual pig iron that accumulated at the bottom could be discharged only when a large amount had accumulated, and this did not pose much of a problem. .
キュポラでスラグ砕石を使用する場合でも、連続的に上
部よりスラグ砕石、コークスを装入し、連続的に底部よ
り少し上の部分より溶融物を排出する場合には、スラグ
砕石中の残銑及びスラグ中の酸化鉄が炉中で還元されて
生成する銑鉄が底部に貯ってくるので、この銑鉄液面が
ロックウール原料排出口のレベルに達する前に底部に外
部より穿孔し、銑鉄を作業中に抜取る必要がある。Even when using crushed slag stone in a cupola, if the crushed slag stone and coke are continuously charged from the top and the molten material is continuously discharged from a portion slightly above the bottom, the residual pig iron and The iron oxide in the slag is reduced in the furnace and the generated pig iron accumulates at the bottom, so before the pig iron liquid level reaches the level of the rock wool raw material outlet, a hole is drilled into the bottom from the outside and the pig iron is removed. You need to take it out inside.
特に後者の溶融スラグを電気炉に受入れ、成分調整およ
び加熱攪拌したのち、溶融物を電気炉の底部より少し上
方の側壁に設けた排出口より製綿機に排出してロックウ
ールを製造する作業では、溶融スラグの受入、成分調整
材の装入は回分式であるか、ロックウール原料溶融物の
排出は連続的であるので炉底に貯る銑鉄は定期的に抜取
り、原料溶融物中に鉄分が混入しないようにする必要か
ある。In particular, the latter process involves receiving molten slag into an electric furnace, adjusting its composition, heating and stirring, and then discharging the molten material from a discharge port installed on the side wall slightly above the bottom of the electric furnace into a cotton mill to produce rock wool. In this case, the reception of molten slag and the charging of composition adjustment materials are done in batches, or the discharge of rock wool raw material melt is continuous, so the pig iron accumulated at the bottom of the furnace is periodically extracted and added to the raw material melt. Is it necessary to prevent iron from getting mixed in?
一般に、この銑鉄の抜取りは、炉底に接する側壁に外部
よりドリル穿孔により銑鉄抜取り口を開孔する方法か採
用されている。この場合、溶融炉は断熱性を良くするた
めに炉壁か厚くなっているので、ドリルのビット径を余
り細くするとビットの強度が弱くなり、又穿孔作業効率
も上らないので、３０〜４０ ｍ ｍφか細い方の限界
であった。Generally, this pig iron is extracted by drilling a pig iron extraction port from the outside in the side wall in contact with the furnace bottom. In this case, the furnace wall of the melting furnace is thick to improve insulation, so if the diameter of the drill bit is made too thin, the strength of the bit will weaken and the drilling efficiency will not improve. The limit was mmφ or the thinner one.
従来このように１種類のドリルビットで開孔されて来て
いる。Conventionally, holes have been drilled using one type of drill bit.
このように３０〜４０ ｍ ｍφのドリルビットたけで
出銑口を開孔すると、炉内容物である溶融スラグの流動
性が大きい事から、この径では流出量が必要以上に多く
、銑鉄と共にロックウール原料も流出する危険性が高く
、マットにより開孔を閉止する場合にも、止栓が困難と
いう問題点があり、作業周辺に与える危険性も大きなも
のとなっていた。When the tap hole is opened with a drill bit of 30 to 40 mm in diameter, the flow rate is larger than necessary due to the high fluidity of the molten slag that is the contents of the furnace, and it locks together with the pig iron. There is also a high risk that the wool raw material will leak out, and even when the openings are closed with mats, it is difficult to stop them, which poses a great danger to the surrounding area.
（問題点を解決するための手段）
本発明者等は、前記のような問題点を解決するため研究
を行い、出銑口の開孔を最初は強度的に問題のない４０
ｍ ｍφ程度のもので銑鉄抜取り湯道の大部分を開孔
しておき、残り部分を小径ビットで開孔すれば流出量が
抑制され、安定した流出が得られて止栓も容易に行える
事を見出し、本発明を完成した。(Means for Solving the Problems) The present inventors conducted research to solve the above-mentioned problems, and the opening of the taphole was initially changed to 40 mm, which had no problem in terms of strength.
If you drill most of the pig iron extraction runner with a diameter of about 50 mm, and then drill the remaining part with a small diameter bit, the amount of outflow will be suppressed, a stable outflow will be obtained, and it will be easy to stop the plug. They discovered this and completed the present invention.
即ち、本発明はスラグな溶融炉に装入し、成分調整およ
び加熱溶融した後、溶融物を製綿機に排出してロックウ
ールを製造する溶融炉の作業において、炉底部に沈降す
る銑鉄を抜き取る際に、少なくとも炉外より炉壁厚さの
１７２〜４１５の部分を直径３０ ｍ ｍ以上の大径ド
リルビットで穿孔し、残りの１／２〜１１５の厚さを直
径２０ ｍ ｍ以下の小径ドリルビットで開孔すること
を特徴とする多段階開孔による残銑抜取方法である。That is, the present invention eliminates the pig iron that settles at the bottom of the furnace during the operation of the melting furnace in which rock wool is produced by charging the slag into a melting furnace, adjusting the composition, heating and melting, and then discharging the molten material to a cotton mill. When extracting, at least the 172 to 415 thickness of the furnace wall is drilled from outside the furnace using a large diameter drill bit with a diameter of 30 mm or more, and the remaining 1/2 to 115 of the thickness is drilled with a diameter of 20 mm or less. This is a method for removing residual pig iron using multi-stage drilling, which is characterized by drilling holes with a small-diameter drill bit.
最初の大径ドリルビットとしては、余り径か大きくなる
と穿孔動力も大きなものを必要とするので、強度的に問
題のない４０ ｍ ｍφ前後のものか好ましい。３０ｍ
ｍφ未満であると湯道の大部分を穿孔するのに強度的に
弱くなり、従って穿孔作業に時間を要し効率的でない。As the first large-diameter drill bit, it is preferable to use a drill bit with a diameter of around 40 mm, which does not cause problems in terms of strength, since the larger the diameter, the greater the drilling power required. 30m
If the diameter is less than mφ, the strength will be too weak to drill most of the runner, and therefore the drilling operation will take time and be inefficient.
この大径のビットて穿孔する長さについては、炉壁の全
体の厚さに関係するが、後段の小径ビットで穿孔する長
さか１２０〜２００ ｍ ｍ残るようにする。即ち炉壁
の厚さの１／２〜４１５の部分を大径ビットで穿孔する
。大径ビットで４１５以上の部分を穿孔すると。The length of the hole to be drilled with this large-diameter bit is related to the overall thickness of the furnace wall, but it should be such that 120 to 200 mm remains, which is the length of the hole to be drilled with the subsequent small-diameter bit. That is, a large-diameter bit is used to drill holes in a portion of 1/2 to 415 mm thick of the furnace wall. When drilling 415 or more parts with a large diameter bit.
後段の小径ビットで穿口する長さが短すぎることになり
、出銑中に孔か拡大するために、目的とする流出量の抑
制と流出量の安定、止栓の容易さか達成されない。また
１／２より小さい部分を大径ビットで穿孔すると、炉壁
の半分以上を小径ビットで穿孔することになり、小径ビ
ットはビット強度が弱いため作業効率が上らない。大径
ビットで穿孔する湯道長さとしては、これ等の要求目的
から炉壁厚さの２／３前後か最も好ましい。The length of the hole to be drilled with the small-diameter bit in the latter stage is too short, and the hole expands during tapping, making it impossible to achieve the desired control of the outflow amount, stability of the outflow amount, and ease of plugging. Furthermore, if a part smaller than 1/2 is drilled with a large-diameter bit, more than half of the furnace wall will be drilled with a small-diameter bit, and the small-diameter bit has a weak bit strength, so the work efficiency cannot be improved. Considering these requirements, the most preferable length of the runner to be drilled with a large-diameter bit is approximately 2/3 of the thickness of the furnace wall.
後段の小径ビットは直径２０ ｍ ｍ以下のものを使用
して、大径ビットの場合より時間をかけて穿口するか、
余り小径であるとビット強度か弱すぎて効率的でないば
かりか、孔か小さすぎて銑鉄の流出も少なすぎ、詰まっ
たりして安定した流出が得られないので１６〜２０ ｍ
ｍφの範囲か好ましい。直径２０ ｍ ｍ以上である
と、大径部分との差が少なく、本発明の目的とする流出
量の抑制、安定、止栓の容易という効果が達成されない
。小径部分か最も浸蝕され拡大するためである。Either use a small-diameter bit in the latter stage with a diameter of 20 mm or less and take more time to drill the hole than with a large-diameter bit, or
If the diameter is too small, the bit strength will be too weak and it will not be efficient, and the hole will be too small and the flow of pig iron will be too small, and it will become clogged and a stable flow will not be obtained.
A range of mφ is preferable. If the diameter is 20 mm or more, there will be little difference from the large diameter portion, and the effects of suppressing the outflow amount, stabilizing it, and making it easy to stop the plug, which are the objectives of the present invention, will not be achieved. This is because the small diameter portion is the most eroded and expanded.
（作用）
管状流路を通る流体の・流量は、その最も細い部分によ
り決定される。本発明で対象とする１５００°Ｃ前後の
高温の溶融物、特に銑鉄の如く比重の大きいものは、開
孔な通じて流出中に管路壁を浸蝕し、孔を拡大する方向
に働く。この作用は流出量か大きい程激しい事は勿論で
ある。開孔を全部４０ ｍ ｍφのビットで開孔すると
、流出量か大きい事に伴って浸蝕程度も大きく、流出量
は急激に増大して止栓の困難さも増大する。(Function) The flow rate of fluid passing through a tubular channel is determined by its narrowest part. Molten materials at a high temperature of around 1,500° C., which is the subject of the present invention, and in particular materials with a high specific gravity such as pig iron, erode the pipe wall while flowing through the open hole, working in the direction of enlarging the hole. Of course, this effect becomes more severe as the amount of outflow increases. If all the holes are opened with a bit of 40 mmφ, the degree of erosion will increase as the amount of outflow increases, and the amount of outflow will increase rapidly, making it more difficult to stop the plug.
本発明の如く、一部を小径ビットで穿孔すると、小径開
孔の部分が流速も、大径部分にくらべ大きいので浸蝕さ
れるが、流出量の絶対値か少なくなるので浸蝕の絶対量
も少ない。この時大径部分ではなおさら浸蝕か少ないの
で、閉止時の止栓も容易となる。また、開孔の長さの大
部分を大径ビットで開孔するので穿孔作業の効率性も失
われず、ビットの強度の上からも問題がない。When a part of the hole is drilled with a small-diameter bit as in the present invention, the flow velocity in the small-diameter part is higher than that in the large-diameter part, so it is eroded, but the absolute value of the flow rate is smaller, so the absolute amount of erosion is also small. . At this time, the large diameter portion is less likely to be eroded, making it easier to stop the plug when closing. Furthermore, since most of the length of the hole is drilled with a large-diameter bit, the efficiency of the drilling operation is not lost, and there are no problems in terms of the strength of the bit.
第１図は電気炉の銑鉄抜取り開孔部を、開孔の中心軸を
通る垂直面で切った縦断面図で示したものである。１は
溶融炉の炉壁、２は炉底、３は銑鉄抜取り開孔部、４は
ドリル、５は小径ドリルビット、６はドリルビット杆取
付軸、７は銑鉄、８はロックウール原料溶融物である。FIG. 1 is a longitudinal sectional view of a pig iron extraction hole in an electric furnace taken along a vertical plane passing through the central axis of the hole. 1 is the wall of the melting furnace, 2 is the bottom of the furnace, 3 is the hole for extracting the pig iron, 4 is the drill, 5 is the small diameter drill bit, 6 is the drill bit rod mounting shaft, 7 is the pig iron, and 8 is the rock wool raw material melt It is.
炉壁の厚さを６００ｍｍとすると、その内炉外から４０
０ｍｍを直径４０ｍｍの大径ドリルビット（図示せず）
でまず穿孔し、ついで直径２０ ｍ ｍの小径ドリルビ
ット５で残りの２００ ｍ ｍを穿孔した。ドリルビッ
ト杆９の長さは７００ ｍ ｍ 、 ドリルビット杆
取付軸６の直径は４０ ｍ ｍで内部にビット冷却用窒
素ガスを送通させている。銑鉄抜取り開孔部３の内径は
４０ ｍ ｍである。銑鉄抜取り開孔部３を全長に亘っ
て４０ｍｍφの開口とした時は、流出量が必要以上に多
く、流出末期には原料溶融物の混入流出も多くなって、
閉止時のマットによる止栓も困難であったが、前記の如
き２段階開孔により流出量は抑制され、流出も安定して
閉止時のマットによる止栓も容易となり、周辺に与える
危険性もなくなった。If the thickness of the furnace wall is 600 mm, the distance from the inside of the furnace to the outside is 40 mm.
0mm to 40mm diameter large diameter drill bit (not shown)
Then, the remaining 200 mm was drilled using a small-diameter drill bit 5 with a diameter of 20 mm. The length of the drill bit rod 9 is 700 mm, the diameter of the drill bit rod mounting shaft 6 is 40 mm, and nitrogen gas for bit cooling is passed inside. The inside diameter of the pig iron extraction hole 3 is 40 mm. When the pig iron extraction hole 3 was made to have a diameter of 40 mm over the entire length, the amount of flow out was larger than necessary, and at the end of the flow, there was a large amount of molten material mixed in and flowed out.
It was difficult to stop the plug with a mat when closing, but the two-stage opening as described above suppresses the amount of outflow, stabilizes the outflow, and makes it easier to stop the plug with a mat when closing, reducing the danger to the surrounding area. lost.
（発明の効果）
以上説明したように、多段階開孔をすることにより、開
孔の長さの大部分を大径のビットにより開孔するので、
この部分てはビット強度も充分であり穿孔作業効率も良
好である。また、残りの長さを直径２０ｍｍ以下の小径
ビットで穿孔することにより流出量が抑制され、安定し
た流出か得られ、閉止時のマットによる止栓も容易に行
なえるようになった。そのため、銑鉄抜取り時に周辺に
与える危険性もなくなった。(Effects of the Invention) As explained above, by performing multi-stage drilling, most of the length of the hole is drilled with a large diameter bit.
This part has sufficient bit strength and good drilling efficiency. In addition, by drilling the remaining length with a small diameter bit of 20 mm or less in diameter, the amount of outflow is suppressed, a stable outflow is obtained, and it is now possible to easily stop the plug with a mat when closing. Therefore, there is no danger to the surrounding area when removing pig iron.
第１図は本発明の２段階目の小径ビットによる開孔作業
を示したもので、開孔の中心軸を通る縦断面図である。
■・・・溶融炉の炉壁
２・・・炉底
５・・・小径のドリルビット
７・・・銑鉄FIG. 1 shows the second stage of the hole-drilling operation using a small-diameter bit according to the present invention, and is a longitudinal sectional view passing through the central axis of the hole. ■...Melting furnace wall 2...Furnace bottom 5...Small diameter drill bit 7...Pig iron
Claims (1)
後、溶融物を製綿機に排出してロックウールを製造する
溶融炉の作業において、炉底部に沈降する銑鉄を抜き取
る際に、少なくとも炉外より炉壁厚さの１／２〜４／５
の部分を直径３０ｍｍ以上の大径ドリルビットで穿孔し
、残りの１／２〜１／５の厚さを直径２０ｍｍ以下の小
径ドリルビットで開孔することを特徴とする多段階開孔
による残銑抜取方法。Slag is charged into a melting furnace, and after its composition is adjusted and heated and melted, the molten material is discharged to a cotton mill to produce rock wool.In the process of removing pig iron that has settled at the bottom of the furnace, at least 1/2 to 4/5 of the furnace wall thickness from outside the furnace
The residual hole is formed by multi-stage drilling, which is characterized by drilling the hole with a large diameter drill bit with a diameter of 30 mm or more, and drilling the remaining 1/2 to 1/5 of the thickness with a small diameter drill bit with a diameter of 20 mm or less. Pig extraction method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23448386A JPS6389429A (en) | 1986-10-03 | 1986-10-03 | Method for extracting residual pig iron by multi-stage open hole |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23448386A JPS6389429A (en) | 1986-10-03 | 1986-10-03 | Method for extracting residual pig iron by multi-stage open hole |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6389429A true JPS6389429A (en) | 1988-04-20 |
| JPH0471015B2 JPH0471015B2 (en) | 1992-11-12 |
Family
ID=16971726
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23448386A Granted JPS6389429A (en) | 1986-10-03 | 1986-10-03 | Method for extracting residual pig iron by multi-stage open hole |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6389429A (en) |
-
1986
- 1986-10-03 JP JP23448386A patent/JPS6389429A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0471015B2 (en) | 1992-11-12 |
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