JPS6147205B2 - - Google Patents
Info
- Publication number
- JPS6147205B2 JPS6147205B2 JP253583A JP253583A JPS6147205B2 JP S6147205 B2 JPS6147205 B2 JP S6147205B2 JP 253583 A JP253583 A JP 253583A JP 253583 A JP253583 A JP 253583A JP S6147205 B2 JPS6147205 B2 JP S6147205B2
- Authority
- JP
- Japan
- Prior art keywords
- hot metal
- iron
- reduced iron
- added
- reduced
- 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.)
- Expired
Links
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 47
- 229910052751 metal Inorganic materials 0.000 claims description 32
- 239000002184 metal Substances 0.000 claims description 32
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 25
- 229910001018 Cast iron Inorganic materials 0.000 claims description 13
- 238000011282 treatment Methods 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 9
- 238000001465 metallisation Methods 0.000 claims description 3
- 230000001590 oxidative effect Effects 0.000 claims description 3
- 239000011572 manganese Substances 0.000 description 22
- 235000013980 iron oxide Nutrition 0.000 description 9
- 238000006243 chemical reaction Methods 0.000 description 8
- 230000003647 oxidation Effects 0.000 description 6
- 238000007254 oxidation reaction Methods 0.000 description 6
- 239000000654 additive Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 229910052748 manganese Inorganic materials 0.000 description 5
- 229910052804 chromium Inorganic materials 0.000 description 4
- 239000011651 chromium Substances 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 230000000996 additive effect Effects 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- AMWRITDGCCNYAT-UHFFFAOYSA-L hydroxy(oxo)manganese;manganese Chemical compound [Mn].O[Mn]=O.O[Mn]=O AMWRITDGCCNYAT-UHFFFAOYSA-L 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 229910001141 Ductile iron Inorganic materials 0.000 description 1
- 229910000805 Pig iron Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 1
- 229910000423 chromium oxide Inorganic materials 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 239000003085 diluting agent Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 235000000396 iron Nutrition 0.000 description 1
- VBMVTYDPPZVILR-UHFFFAOYSA-N iron(2+);oxygen(2-) Chemical class [O-2].[Fe+2] VBMVTYDPPZVILR-UHFFFAOYSA-N 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000002407 reforming Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/04—Removing impurities other than carbon, phosphorus or sulfur
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Description
本発明は鋳鉄溶銑に還元鉄を添加して有害元
素、主としてMnを除去するための方法に関す
る。
例えばダクタイル鋳鉄鋳物を鋳造する場合で
は、必要な組織と性質を具備する高品質のものを
得るためには、その原料溶銑として、Si、Ｃ含有
量が高く、一方Mn、Cr等の含有量の低いものを
使用する必要がある。
しかし近年の資源枯渇の折から、キユポラ配合
原料として安価でかつ良質の鋼屑や鋳物故銑等を
入取し難い事情にあり、これがため鋳物溶銑とし
てMn等の有害成分を多く含む低品位のものを積
極的に活用しなければならない状況にある。
そこで、この種低品位の鋳鉄溶銑から有害な
Mn等の成分を選択的に除去し、有用な鋳鉄溶銑
に改質する技術手段を開発することが当該分野に
おける一つの技術的課題となつている。
本発明は上記技術的課題に鑑みなされたもの
で、Mn等の有害成分を有効に除去するために鋳
鉄溶銑に還元鉄を添加して処理することを主旨と
するものであり、その特徴とする処は、６〜15重
量％の酸化鉄と0.5〜2.5重量％のＣとを含む金属
化率80〜95重量％の還元鉄を鋳鉄溶銑に添加し、
上記溶銑からMnを選択的に除去する点にある。
本発明の処理方法で脱Mn処理のために使用す
る添加剤の主成分は還元鉄である。周知のように
還元鉄は、Fe2O3のような酸化鉄原料を加熱下に
H2＋CO混合ガスのような還元性ガスと反応せし
め、ソリツド状態で直接還元せしめたFe単体か
らなるものである。しかし還元鉄には、Fe以外
にＣ等その他の成分が若干含有されているのが通
例である。この還元鉄を溶銑中に添加すると、殆
んどメタリツクのFeとして溶銑に固溶されるこ
とになる。
しかして本発明では、この還元鉄を主成分とし
これに直接Mnの除去反応にたずさわるものとし
て、適量の還元鉄及びＣを混合せしめて鋳鉄溶銑
に添加することを特徴とするものである。すなわ
ち、酸化鉄（Fe2O3、Fe3O4、FeO）は溶銑に多
量に含有されているMnと優先的に結合し、Mnを
酸化してMnスラグを形成する反応を通してMnを
除去する。これは典形的な形態として、次の如き
ベツセマー反応による。
2Fe2O3＋2Mn→2MnO2＋2FeO
このように還元鉄に混合して使用される酸化鉄
には、いわゆるミルスケールや発銹した鉄スクラ
ツプ等を用いる。
一方還元鉄に含有されらるＣは、溶銑中に添加
されると、次のような反応を起こし、
Ｃ＋FeO→Fe＋CO
FeOからメタリツクのFeを生成すると共に、そ
の反応によつて生じたCOガスが溶銑中で添加剤
が団塊化するのを防止し、その添加効率を向上す
る上で非常な改善効果をもたらす。すなわち、単
に酸化鉄入りの還元鉄を添加した場合では、溶銑
に添加後その表面にスラグを形成し、粒状に団塊
化してしまうのに対し、Ｃを適量含有するもので
は上記COガスがこれを内部から飛散せしめ、添
加剤と溶銑との反応効率を著しく促進するものと
なる。
以上のように還元鉄を主成分とし、これに酸化
鉄と若干のＣを混合して構成される添加剤にあつ
ては、その混合比率が重要な問題とされる。酸化
鉄については還元鉄に対して６〜15重量％含有せ
しめ、最終的に還元鉄の金属化率、即ちメタル
Fe／トータルFeを80〜95重量％に調整するのが
よい。すなわち酸化鉄分が少なすぎるとMn除去
効果が小さく、反面酸化鉄分が多すぎると有用な
Ｃ、Si成分の損失も大きくなるためである。また
Ｃ含有量については、0.5〜2.5重量％の含有が必
要である。すなわち0.5％以下の含有量では前記
反応促進作用が充分発揮されず、他方2.5％以上
ではその作用も一定化するためである。
次に本発明に係る添加剤の添加方法について説
明する。鋳鉄溶銑に対する添加位置乃至時期は、
取鍋又は誘導炉等の溜炉で実施することもできる
し、キユポラ、高炉等からの溶銑樋で実施するこ
ともできる。
さらに好ましい添加条件を掲げれば、次の通り
である。例えばC2.5〜4.0％、Si1.0〜3.5％を含む
鋳鉄溶銑から有用な成分、特にSi酸化減損を防止
しつつMnを優先的に除去する場合にあつては、
その溶銑温度を1450〜1600℃の範囲に保持して添
加するのが好適である。これはＣが含まれた溶湯
においては、1450℃以上ではSiの酸化よりもＣの
酸化が優先的に進行するのに対し、Mnの酸化は
1600℃位まではＣに影響されず進み得ることによ
る。すなわち、この温度条件によると、Siのロス
が最小限に抑制される。
また還元鉄の添加は、その鋳鉄溶湯を酸化性雰
囲気に保持して行なうのが好適である。これは還
元鉄をMn、Crのような有害成分の希釈剤として
使用することができるためである。すなわち、還
元鉄中には若干のMn、Crが混在しているが、こ
れは酸化マンガンや酸化クロムの酸化物の形態で
含されているのが常であり、もし還元鉄を酸化性
雰囲気で添加するようにすれば、還元鉄は実質的
にMn、Crを含まない純粋なFe原料としてみるこ
とができるからである。
次に本発明の溶銑処理方法の実施例を比較例と
共に、下記に掲げる。
まず表１に処理に用いた還元鉄の種類とその成
分組成等を示す。そして表２にこれらの還元鉄を
添加して処理した結果を示す。溶銑の処理条件
は、いずれも溶銑処理量350Kg、処理温度1500℃
である。なお、還元鉄中No.Ａ、Ｂのものが本発明
の成分範囲に属し、処理No.１、２、３が本発明の
実施例である。
The present invention relates to a method for adding reduced iron to cast iron hot metal to remove harmful elements, mainly Mn. For example, when casting ductile iron castings, in order to obtain high quality products with the required structure and properties, the raw material hot metal must have a high content of Si and C, while a low content of Mn, Cr, etc. You need to use a lower one. However, due to resource depletion in recent years, it has become difficult to obtain inexpensive and high-quality steel scraps and foundry waste pig iron as raw materials for compounding Kyupora. We are in a situation where we have to actively utilize things. Therefore, this type of low-grade cast iron hot metal can be harmful.
One of the technical challenges in this field is to develop a technical means to selectively remove components such as Mn and reform it into useful cast iron hot metal. The present invention was made in view of the above technical problem, and its main purpose is to add reduced iron to cast iron hot metal for treatment in order to effectively remove harmful components such as Mn, and its characteristics are as follows: The process involves adding reduced iron with a metallization rate of 80 to 95% by weight, containing 6 to 15% by weight of iron oxide and 0.5 to 2.5% by weight of C, to cast iron hot metal.
The point is to selectively remove Mn from the hot metal. The main component of the additive used for the Mn removal treatment in the treatment method of the present invention is reduced iron. As is well known, reduced iron is produced by heating iron oxide raw materials such as Fe 2 O 3 .
It consists of Fe, which is directly reduced in a solid state by reacting with a reducing gas such as H 2 + CO mixed gas. However, reduced iron usually contains a small amount of other components such as C in addition to Fe. When this reduced iron is added to hot metal, it becomes a solid solution in the hot metal mostly as metallic Fe. Therefore, the present invention is characterized in that this reduced iron is the main component, and an appropriate amount of reduced iron and C are mixed therein and added to the cast iron hot metal as it directly participates in the Mn removal reaction. In other words, iron oxides (Fe 2 O 3 , Fe 3 O 4 , FeO) preferentially combine with Mn, which is contained in large amounts in hot metal, and remove Mn through a reaction that oxidizes Mn and forms Mn slag. . This typically involves the following Betsemer reaction. 2Fe 2 O 3 +2Mn→2MnO 2 +2FeO As the iron oxide mixed with reduced iron in this way, so-called mill scale, rusted iron scrap, etc. are used. On the other hand, when C contained in reduced iron is added to hot metal, it causes the following reaction, producing metallic Fe from C+FeO→Fe+CO FeO, and CO gas produced by the reaction. It prevents additives from forming agglomerates in hot metal and has a significant improvement effect in improving the addition efficiency. In other words, when reduced iron containing iron oxide is simply added, slag is formed on the surface of the hot metal and becomes agglomerated into particles, whereas when reduced iron containing an appropriate amount of C is added, the CO gas It scatters from the inside and significantly accelerates the reaction efficiency between the additive and the hot metal. As mentioned above, when it comes to additives that contain reduced iron as a main component, mixed with iron oxide and some C, the mixing ratio is an important issue. The content of iron oxide is 6 to 15% by weight based on the reduced iron, and the final metallization rate of the reduced iron, that is, the metal
It is preferable to adjust Fe/total Fe to 80 to 95% by weight. That is, if the iron oxide content is too small, the Mn removal effect will be small, while if the iron oxide content is too large, the loss of useful C and Si components will also be large. Further, the C content must be 0.5 to 2.5% by weight. That is, if the content is less than 0.5%, the reaction promoting effect is not sufficiently exhibited, whereas if the content is more than 2.5%, the effect becomes constant. Next, a method for adding additives according to the present invention will be explained. The addition position and timing for cast iron hot metal are as follows:
It can be carried out in a sump furnace such as a ladle or an induction furnace, or it can be carried out in a hot metal trough from a cupola, blast furnace, etc. More preferable addition conditions are as follows. For example, when removing useful components preferentially from cast iron hot metal containing 2.5 to 4.0% C and 1.0 to 3.5% Si, in particular Mn while preventing Si oxidation loss,
It is preferable to maintain the temperature of the hot metal in the range of 1450 to 1600°C before adding it. This is because in a molten metal containing C, oxidation of C progresses preferentially over oxidation of Si at temperatures above 1450°C, whereas oxidation of Mn progresses preferentially over oxidation of Si.
This is because it can proceed up to about 1600℃ without being affected by C. That is, according to this temperature condition, the loss of Si is suppressed to a minimum. Further, it is preferable to add reduced iron while maintaining the molten cast iron in an oxidizing atmosphere. This is because reduced iron can be used as a diluent for harmful components such as Mn and Cr. In other words, reduced iron contains a small amount of Mn and Cr, but these are usually contained in the form of oxides such as manganese oxide and chromium oxide, and if reduced iron is exposed to an oxidizing atmosphere, This is because if added, reduced iron can be viewed as a pure Fe raw material that does not substantially contain Mn and Cr. Next, examples of the hot metal treatment method of the present invention are listed below together with comparative examples. First, Table 1 shows the type of reduced iron used in the treatment and its component composition. Table 2 shows the results of the treatment with the addition of these reduced irons. The processing conditions for hot metal are 350 kg of hot metal and a processing temperature of 1500°C.
It is. Incidentally, reduced iron Nos. A and B belong to the component range of the present invention, and treatments No. 1, 2, and 3 are examples of the present invention.
【表】【table】
【表】
上記処理成積から次のような点が明らかとされ
る。すなわち、M.Fe／T.Fe並びにＣ含有量を所
定範囲に調整した還元鉄Ａ、Ｂを添加した場合
（No.１、２、３）では、Ｃ、Siのロス少なく、Mn
の顕著な選択除去効果が発揮される。一方Ｃ含有
量の少ない還元鉄Ｃを添加した場合（No.４）で
は、還元鉄の添加歩留りが悪く、所期の反応が充
分に促進されない。またM.Fe／T.Feが高すぎる
還元鉄Ｄを添加した場合（No.５）ではやはりMn
の除去効果が少なく、反対にその比率が低すぎる
還元鉄Ｅを添加した場合（No.６）ではMnのみな
らずＣ、Siの酸化ロスが大となる。
この処理結果により、還元鉄添加による鋳鉄溶
銑からのMnの選択的除去が明瞭に看取されると
共に、先に述べた還元鉄の成分範囲の意義とその
重要性が裏付けられる。
以上のように、本発明はMn等の有害成分を多
く含む鋳鉄溶銑の改質処理方法として、特定成分
範囲に調整した還元鉄を添加するという簡単な手
段により、顕著なMnの選択除去効果の発揮され
るものである。[Table] The following points are clear from the above processing results. In other words, when M.Fe/T.Fe and reduced iron A and B whose C content is adjusted to a predetermined range are added (No. 1, 2, and 3), there is less loss of C and Si, and Mn
A remarkable selective removal effect is exhibited. On the other hand, when reduced iron C having a low C content is added (No. 4), the addition yield of reduced iron is poor and the desired reaction is not sufficiently promoted. In addition, when reduced iron D with too high M.Fe/T.Fe is added (No. 5), M.Fe/T.Fe is too high.
On the other hand, when reduced iron E is added at a too low ratio (No. 6), the oxidation loss of not only Mn but also C and Si becomes large. The results of this treatment clearly demonstrate the selective removal of Mn from cast iron hot metal by the addition of reduced iron, and also support the significance and importance of the component range of reduced iron mentioned above. As described above, the present invention is a method for reforming cast iron hot metal containing a large amount of harmful components such as Mn, and achieves a remarkable selective removal effect of Mn by the simple means of adding reduced iron adjusted to a specific range of components. It is something that can be demonstrated.
Claims (1)
とを含む金属化率80〜95重量％の還元鉄を鋳鉄溶
銑に添加し、上記溶銑からMnを選択的に除去す
ることを特徴とする溶銑処理方法。 ２ 鋳鉄溶銑を1450〜1600℃に保持しつつ還元鉄
を添加する特許請求の範囲第１項記載の溶銑処理
方法。 ３ 鋳鉄溶銑を酸化性雰囲気に保持しつつ還元鉄
を添加する特許請求の範囲第１項又は第２項記載
の溶銑処理方法。[Claims] 1 6-15% by weight of iron oxide and 0.5-2.5% by weight of C
A method for treating hot metal, which comprises adding reduced iron having a metallization rate of 80 to 95% by weight, and selectively removing Mn from the hot metal. 2. The hot metal treatment method according to claim 1, wherein reduced iron is added while maintaining the cast iron hot metal at 1450 to 1600°C. 3. The hot metal treatment method according to claim 1 or 2, wherein reduced iron is added while maintaining cast iron hot metal in an oxidizing atmosphere.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP253583A JPS59126706A (en) | 1983-01-08 | 1983-01-08 | Hot metal processing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP253583A JPS59126706A (en) | 1983-01-08 | 1983-01-08 | Hot metal processing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59126706A JPS59126706A (en) | 1984-07-21 |
| JPS6147205B2 true JPS6147205B2 (en) | 1986-10-17 |
Family
ID=11532072
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP253583A Granted JPS59126706A (en) | 1983-01-08 | 1983-01-08 | Hot metal processing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59126706A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4718739B2 (en) * | 2001-09-27 | 2011-07-06 | 新日本製鐵株式会社 | Demanganese treatment method for cast iron |
| JP5150654B2 (en) * | 2010-01-28 | 2013-02-20 | 株式会社木村鋳造所 | Method for removing impurities in cast iron melt and cast iron raw material |
| JP5972224B2 (en) * | 2013-06-11 | 2016-08-17 | 特殊電極株式会社 | Demanganese method |
-
1983
- 1983-01-08 JP JP253583A patent/JPS59126706A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59126706A (en) | 1984-07-21 |
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