JPH032309A - Method for pre-treating molten iron - Google Patents
Method for pre-treating molten ironInfo
- Publication number
- JPH032309A JPH032309A JP13609789A JP13609789A JPH032309A JP H032309 A JPH032309 A JP H032309A JP 13609789 A JP13609789 A JP 13609789A JP 13609789 A JP13609789 A JP 13609789A JP H032309 A JPH032309 A JP H032309A
- Authority
- JP
- Japan
- Prior art keywords
- hot metal
- hood
- molten iron
- submerged
- immersion hood
- 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
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title abstract 16
- 229910052742 iron Inorganic materials 0.000 title abstract 8
- 238000000034 method Methods 0.000 title description 5
- 238000002347 injection Methods 0.000 claims abstract description 16
- 239000007924 injection Substances 0.000 claims abstract description 16
- 239000011823 monolithic refractory Substances 0.000 claims abstract description 12
- 238000002203 pretreatment Methods 0.000 claims abstract description 11
- 229910052751 metal Inorganic materials 0.000 claims description 77
- 239000002184 metal Substances 0.000 claims description 77
- 239000000463 material Substances 0.000 claims description 7
- 238000003756 stirring Methods 0.000 claims description 5
- 239000002994 raw material Substances 0.000 abstract description 10
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 abstract description 7
- 229910001882 dioxygen Inorganic materials 0.000 abstract description 7
- 229910052845 zircon Inorganic materials 0.000 abstract description 5
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 abstract description 5
- 238000007664 blowing Methods 0.000 abstract description 4
- 238000007654 immersion Methods 0.000 description 33
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 6
- 229910052799 carbon Inorganic materials 0.000 description 6
- 239000012535 impurity Substances 0.000 description 6
- 239000002893 slag Substances 0.000 description 6
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 5
- 229910052698 phosphorus Inorganic materials 0.000 description 5
- 239000011574 phosphorus Substances 0.000 description 5
- 229910052710 silicon Inorganic materials 0.000 description 5
- 239000010703 silicon Substances 0.000 description 5
- 239000007788 liquid Substances 0.000 description 4
- 235000013305 food Nutrition 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 2
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 2
- 229910000805 Pig iron Inorganic materials 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 235000011941 Tilia x europaea Nutrition 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 239000003575 carbonaceous material Substances 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000004571 lime Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 235000010216 calcium carbonate Nutrition 0.000 description 1
- 239000001506 calcium phosphate Substances 0.000 description 1
- 229910000389 calcium phosphate Inorganic materials 0.000 description 1
- 235000011010 calcium phosphates Nutrition 0.000 description 1
- 239000012159 carrier gas Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000003779 heat-resistant material Substances 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 229910001392 phosphorus oxide Inorganic materials 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- VSAISIQCTGDGPU-UHFFFAOYSA-N tetraphosphorus hexaoxide Chemical compound O1P(O2)OP3OP1OP2O3 VSAISIQCTGDGPU-UHFFFAOYSA-N 0.000 description 1
- QORWJWZARLRLPR-UHFFFAOYSA-H tricalcium bis(phosphate) Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QORWJWZARLRLPR-UHFFFAOYSA-H 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Landscapes
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
- Furnace Charging Or Discharging (AREA)
Abstract
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は、溶銑予備処理方法に関する。[Detailed description of the invention] [Industrial application field] The present invention relates to a hot metal pretreatment method.
［従来の技術］
高炉出銑された溶銑には燐、硫黄、炭素、珪素等の不純
物が不可避的に含有されている。一般に、燐、硫黄、炭
素、珪素等の不純物元素は、鋼の特性を低下させる。特
に、不純物元素の中でも燐は鋼の靭性を低下させるため
、製銑、製鋼工程では溶湯を脱燐処理する必要がある。[Prior Art] Hot metal tapped from a blast furnace inevitably contains impurities such as phosphorus, sulfur, carbon, and silicon. Generally, impurity elements such as phosphorus, sulfur, carbon, and silicon degrade the properties of steel. In particular, since phosphorus among impurity elements reduces the toughness of steel, it is necessary to dephosphorize the molten metal in the pig iron making and steel making processes.
したがって、これらの不純物元素を効率良く除去する方
法の開発が行われている。Therefore, methods are being developed to efficiently remove these impurity elements.
これらの不純物を除去する方法として、溶湯を転炉に移
す前に溶銑鍋において予備処理を施す溶銑予備処理方法
が行われている。溶銑予備処理方法は、石灰等の副原料
を吹き込むためのインジェクションランスを溶銑中に浸
漬させ、溶銑にスケール等を投入上置し、場面に酸素を
供給するための酸素ガス吹付はランスを配置する。そし
て、酸素ガス吹付はランスから供給された酸素により溶
銑中の珪素及び炭素を燃焼させ、燃焼により発生した熱
でインジェクションランスから溶銑中に吹き込まれた副
原料を溶解させて溶銑を撹拌し、溶銑中の不純物、特に
燐を反応させてスラグとして除去する。As a method for removing these impurities, a hot metal pretreatment method is used in which the molten metal is pretreated in a hot metal ladle before being transferred to a converter. The hot metal pretreatment method involves immersing an injection lance for injecting auxiliary materials such as lime into the hot metal, placing scale, etc. in the hot metal, and placing a lance for blowing oxygen gas to supply oxygen to the area. . In the oxygen gas blowing, silicon and carbon in the hot metal are combusted by the oxygen supplied from the lance, and the heat generated by the combustion dissolves the auxiliary materials injected into the hot metal from the injection lance, stirring the hot metal. Impurities inside, especially phosphorus, are reacted and removed as slag.
この場合、溶銑中に副原料を吹き込むため、溶銑が場面
で泡だち、スロッピング（泡だち）やスピッティング（
飛散）が発生する。このスロッピング、スピッティング
が激しくなると、溶銑及びスラグが溶銑鍋外へ飛び散る
という問題を生じる。In this case, the auxiliary raw materials are injected into the hot metal, causing the hot metal to bubble, slopping, and spitting (
Scattering) occurs. When this slopping and spitting becomes severe, a problem arises in that the hot metal and slag fly out of the hot metal ladle.
この問題を解決するために、フードを溶銑撹拌領域の湯
面を覆うように浸漬し、鍋外への溶銑及びスラグの飛散
を防止する。なお、フードは、湯面に被せられるため、
インジェクションランスがフード上部を貫通し、ランス
下端がフード内にて溶銑に浸漬されるようになっている
。これによって、スロッピング、スピッティングが、溶
銑が撹拌される領域に対応する湯面に制限されて、溶銑
鍋から溶銑、スラグ等が零れることがない。To solve this problem, a hood is immersed to cover the hot metal surface in the hot metal stirring area to prevent hot metal and slag from scattering outside the pot. In addition, since the hood is placed over the hot water surface,
The injection lance passes through the upper part of the hood, and the lower end of the lance is immersed in hot metal inside the hood. As a result, slopping and spitting are restricted to the hot metal surface corresponding to the area where the hot metal is stirred, and the hot metal, slag, etc. do not spill out from the hot metal ladle.
［発明が解決しようとする課題］
しかしながら、溶銑予備処理を続けるうちに、浸漬フー
ド内壁に溶銑が付着凝固する。この凝固金属が付着成長
すると浸漬フード内の断面積が減少する。このため、フ
ード内の湯面が上昇し、スラグ及び溶銑の飛沫が、浸漬
フードの上部のインジェクションランスの貫通孔まで達
して、その貫通孔近傍で凝固する。この結果、操業を停
止して浸漬フードを交換する際にインジェクションラン
スを浸漬フードから抜き取ることができなくなり、ガス
切断等で凝固した溶銑を融解させてインジェクションラ
ンスを浸漬フードから取り外す作業を要し、操業に悪影
ツを及ぼす。また、浸漬フードを短期間で交換しなけれ
ばならない。したがって、溶銑予備処理において溶銑が
付着しにくい浸漬フードを使用することが望まれている
。[Problems to be Solved by the Invention] However, as the hot metal pretreatment continues, the hot metal adheres to the inner wall of the immersion hood and solidifies. As this solidified metal adheres and grows, the cross-sectional area within the immersion hood decreases. As a result, the hot water level in the hood rises, and the slag and hot metal droplets reach the through hole of the injection lance in the upper part of the immersion hood and solidify near the through hole. As a result, when the operation is stopped and the immersion hood is replaced, the injection lance cannot be removed from the immersion hood, and it is necessary to melt the solidified hot metal by gas cutting, etc., and then remove the injection lance from the immersion hood. This will have a negative impact on operations. Also, the immersion hood must be replaced after a short period of time. Therefore, it is desired to use an immersion hood to which hot metal does not adhere easily during hot metal pretreatment.
本発明はかかる点に鑑みてなされたものであり、溶銑が
付イコしにくい性質を持つ浸漬フードを使用して長期間
にわたって安定して操業することができる溶銑予備処理
方法を提供することを目的とする。The present invention has been made in view of these points, and an object of the present invention is to provide a hot metal pretreatment method that can be operated stably over a long period of time using an immersion hood that has the property of preventing hot metal from becoming hot. shall be.
［課題を解決するための手段］
本発明は、溶銑撹拌領域の湯面を覆うようにフードを浸
漬し、インジェクションランスにより副原料を溶銑中に
吹き込む溶銑予備処理方法において、前記フードの内面
を不定形耐火物で被覆していることを特徴とする。[Means for Solving the Problems] The present invention provides a hot metal pretreatment method in which a hood is immersed so as to cover the hot metal surface in a hot metal stirring area, and an auxiliary material is injected into the hot metal using an injection lance. It is characterized by being covered with a shaped refractory.
［作 用］
本発明の溶銑予備処理方法によれば、溶銑が撹拌される
領域に対応する場面を不定形耐火物を被覆した浸漬フー
ドで覆って溶銑予備処理を行う。[Function] According to the hot metal pretreatment method of the present invention, the hot metal pretreatment is performed by covering the area corresponding to the area where the hot metal is stirred with an immersion hood coated with a monolithic refractory.
このため、副原料を溶銑に吹き込む際に起こるスロッピ
ング及びスピッティングによる浸漬フードの溶銑の付着
を防止することができる。Therefore, it is possible to prevent the hot metal from adhering to the immersion hood due to slopping and spitting that occur when blowing the auxiliary raw material into the hot metal.
一般に、液体と固体とを接触させた場合に両者のなす角
度（固液界面の接触角）が小さいほど固体に対する液体
の付着力が大きく （濡れ易い）、接触角が大きいほど
固体に対する液体の付着力が小さい（濡れ難い）。不定
形耐火、物、特に、ジルコン質、マグネシア質、ジルコ
ン−カーボン質、マグネシア−カーボン質等のものは、
溶銑に対して濡れ難い性質がある。このため、これ、ら
の不定形耐火物を浸漬フード内部に塗布することにより
、スピッティングによる溶銑が浸漬フードに接触しても
はじかれ、付着凝固するのを防止する。In general, when a liquid and a solid come into contact, the smaller the angle between the two (contact angle at the solid-liquid interface), the greater the adhesion force of the liquid to the solid (easier wetting), and the larger the contact angle, the greater the adhesion of the liquid to the solid. Low adhesion (hard to get wet). Amorphous refractory materials, especially zircon materials, magnesia materials, zircon-carbon materials, magnesia-carbon materials, etc.
It has the property of being difficult to wet with hot metal. For this reason, by coating the inside of the immersion hood with these monolithic refractories, hot metal produced by spitting is repelled even if it comes into contact with the immersion hood, thereby preventing it from adhering and solidifying.
［実施例］
以下、本発明の実施例について図面を参照して具体的に
説明する。[Examples] Examples of the present invention will be specifically described below with reference to the drawings.
第１図は、本発明の溶銑予備処理方法に使用される装置
の模式図である。FIG. 1 is a schematic diagram of an apparatus used in the hot metal pretreatment method of the present invention.
図中にて符号１０は、溶銑鍋である。溶銑鍋１０内には
溶銑１２が入っている。溶銑１２には図示しないスケー
ルが上置投入されている。溶銑鍋］０の溶銑１２の中央
部に石灰等の副原料を吹き込むためのインジェクション
ランス１４の下端か浸漬されている。また、酸素ガス吹
付はランス１６が溶銑１２の湯面の直上に配置されてい
る。In the figure, numeral 10 is a hot metal ladle. A hot metal pot 10 contains hot metal 12. A scale (not shown) is placed above the hot metal 12. The lower end of an injection lance 14 for injecting auxiliary raw materials such as lime into the center of hot metal 12 is immersed. Further, for oxygen gas spraying, the lance 16 is placed directly above the surface of the hot metal 12.
浸漬フード１８が、鍋１０の上方にて昇降装置（図示せ
ず）により昇降可能に支持されている。An immersion hood 18 is supported above the pot 10 so as to be movable up and down by a lifting device (not shown).
この浸漬フード１８は、カップ状をなす。浸漬フード１
８の軸心に沿ってインジェクションランス１４及び酸素
ガス吹付はランス１６が浸漬フード１８の上部を貫通し
ている。ここで、浸漬フード】８は、高アルミナやジル
コン等の耐熱性材料からなる。また、この浸漬フード１
８の大きさは、副原料の吹き込みにより起こるスロッピ
ング及びスピッティング発生頭載の溶銑湯面を覆うこと
ができるように設定する。浸漬フード１８の内側には、
副原料を溶銑に吹き込む際に起こるスピッティングによ
る溶銑の付着を防止するためにジルコン質不定形耐火物
が塗布されている。浸漬フード１８の内側に塗布する不
定形耐火物は、スビッテインクによる溶銑の付着を防止
できるものであればいずれのものでもよく、ジルコン質
不定形耐火物の他にマグネシア質不定形耐火物やこれら
のものにカーボンを含有させたもの等が挙げられる。This immersion hood 18 has a cup shape. Soaking food 1
An injection lance 14 and an oxygen gas spray lance 16 pass through the upper part of the immersion hood 18 along the axis of the immersion hood 18 . Here, the immersion hood 8 is made of a heat-resistant material such as high alumina or zircon. Also, this immersion food 1
The size of No. 8 is set so that it can cover the surface of the molten pig iron above which slopping and spitting occur due to the injection of auxiliary raw materials. Inside the immersion hood 18,
Zircon monolithic refractories are coated to prevent adhesion of hot metal due to spitting that occurs when auxiliary raw materials are blown into hot metal. The monolithic refractory applied to the inside of the immersion hood 18 may be any material as long as it can prevent the adhesion of hot metal due to svitte ink. Examples include those containing carbon.
さらに、これらの不定形耐火物を複数層に塗布してもよ
い。また、浸漬フード１８に不定形耐火物を塗布する方
法は、例えば、不定形耐火物のモルタル浴に浸漬フード
１８を浸漬させて塗布するもの等が挙げられるがこれに
限定されるものではない。Furthermore, these monolithic refractories may be applied in multiple layers. Moreover, the method of applying the monolithic refractory to the immersion hood 18 includes, for example, a method of immersing the immersion hood 18 in a mortar bath of monolithic refractory and applying the coating, but is not limited thereto.
溶銑１２に酸素ガス吹付はランスから酸素ガスを吹き込
み、溶銑１２中の珪素及び炭素を燃焼させて熱を発生さ
せる。インジェクションランス１４から溶銑１２中に窒
素ガスをキャリアーガスとしてＣａＯ−ＣａＦ２−Ｃａ
ＣＯ３系の副原料を吹き込む。溶銑１２中に吹き込まれ
た副原料は、溶銑中の珪素及び炭素の燃焼によって得ら
れた熱で溶解され、溶銑１２と共に撹拌される。撹拌に
より溶銑と副原料が混合し、Ｃａ Ｏｓ Ｃａ Ｆ ２
、並びにＣａＣＯ３が溶銑中の燐と反応し、燐酸カルシ
ウムを経て安定な酸化燐となり脱燐スラグ中に移行する
。Oxygen gas is blown into the hot metal 12 from a lance, and silicon and carbon in the hot metal 12 are combusted to generate heat. CaO-CaF2-Ca is introduced into the hot metal 12 from the injection lance 14 using nitrogen gas as a carrier gas.
Inject CO3-based auxiliary raw materials. The auxiliary raw material blown into the hot metal 12 is melted by heat obtained by combustion of silicon and carbon in the hot metal, and is stirred together with the hot metal 12. The hot metal and the auxiliary raw materials are mixed by stirring, resulting in CaOsCaF2
, and CaCO3 react with phosphorus in the hot metal and become stable phosphorus oxide via calcium phosphate and migrate into the dephosphorization slag.
この場合、インジェクションランス１４から副原料が溶
銑１２に吹き込まれるため、スロッピング及びスピッテ
ィングが起こるが、浸漬フード１８が配置されているの
で、スロッピング及びスピッティングは浸漬フード１８
で覆われた領域内に制限される。そして、浸漬フード１
８の内側にはジルコン質の不定形耐火物が塗布されてい
るため、スピッティングによる溶銑の浸漬フード内の付
着を防止する。したがって、溶銑の付着凝固によって浸
漬フードを交換する必要がなく、長期間にわたって安定
して溶銑予備処理を操業することができる。In this case, slopping and spitting occur because the auxiliary raw material is injected into the hot metal 12 from the injection lance 14, but since the immersion hood 18 is arranged, the slopping and spitting are prevented by the immersion hood 18.
limited to the area covered by. And immersion food 1
Since the inside of 8 is coated with a zircon-based monolithic refractory, it prevents hot metal from adhering to the inside of the immersion hood due to spitting. Therefore, there is no need to replace the immersion hood due to adhesion and solidification of hot metal, and hot metal pretreatment can be operated stably over a long period of time.
［発明の効果］
以上説明した如く、本発明の溶銑予備処理方法は、溶銑
に対して濡れ難い性質を持つ浸漬フードを使用して浸漬
フード内に溶銑を付着させないで行うため、浸漬フード
の交換が容易である。また、浸−漬フードの交換回数を
減少させることができるので、長期間にわたって安定し
て溶銑予備処理を操業することができるものである。[Effects of the Invention] As explained above, the hot metal pretreatment method of the present invention uses an immersion hood that does not easily wet the molten metal and is carried out without molten metal adhering to the inside of the immersion hood, so there is no need to replace the immersion hood. is easy. Furthermore, since the number of times the immersion hood is replaced can be reduced, hot metal pretreatment can be operated stably over a long period of time.
第１図は本発明の実施例において使用される装置の模式
図である。
１０・・・溶銑鍋、１２・・・溶銑、１４・・・インジ
ェクションランス、１６・・・酸素ガス吹付はランス、
１８・・・浸漬フード内
出願人代理人 弁理士 鈴江武彦FIG. 1 is a schematic diagram of an apparatus used in an embodiment of the invention. 10...Hot metal pot, 12...Hot metal, 14...Injection lance, 16...Lance for oxygen gas spraying,
18...Applicant in the immersion hood Patent attorney Takehiko Suzue
Claims (1)
ジェクションランスにより副原料を溶銑中に吹き込む溶
銑予備処理方法において、前記フードの内面を不定形耐
火物で被覆していることを特徴とする溶銑予備処理方法
。A hot metal pretreatment method in which a hood is immersed so as to cover the hot metal surface in a hot metal stirring area, and auxiliary materials are injected into the hot metal using an injection lance, characterized in that the inner surface of the hood is coated with a monolithic refractory. Hot metal pretreatment method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13609789A JPH032309A (en) | 1989-05-31 | 1989-05-31 | Method for pre-treating molten iron |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13609789A JPH032309A (en) | 1989-05-31 | 1989-05-31 | Method for pre-treating molten iron |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH032309A true JPH032309A (en) | 1991-01-08 |
Family
ID=15167196
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13609789A Pending JPH032309A (en) | 1989-05-31 | 1989-05-31 | Method for pre-treating molten iron |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH032309A (en) |
-
1989
- 1989-05-31 JP JP13609789A patent/JPH032309A/en active Pending
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