JPH02298208A - Method for pre-treating molten iron - Google Patents
Method for pre-treating molten ironInfo
- Publication number
- JPH02298208A JPH02298208A JP11767389A JP11767389A JPH02298208A JP H02298208 A JPH02298208 A JP H02298208A JP 11767389 A JP11767389 A JP 11767389A JP 11767389 A JP11767389 A JP 11767389A JP H02298208 A JPH02298208 A JP H02298208A
- Authority
- JP
- Japan
- Prior art keywords
- molten iron
- hot metal
- converter
- heat source
- blown
- 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
- 238000000034 method Methods 0.000 title claims abstract description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title abstract 14
- 229910052742 iron Inorganic materials 0.000 title abstract 7
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 13
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 10
- 239000001301 oxygen Substances 0.000 claims abstract description 10
- 238000002203 pretreatment Methods 0.000 claims abstract description 7
- 229910052751 metal Inorganic materials 0.000 claims description 35
- 239000002184 metal Substances 0.000 claims description 35
- 239000002904 solvent Substances 0.000 claims description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 19
- 229910052799 carbon Inorganic materials 0.000 abstract description 16
- 238000007664 blowing Methods 0.000 abstract description 14
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 abstract description 2
- 229910052717 sulfur Inorganic materials 0.000 abstract description 2
- 239000011593 sulfur Substances 0.000 abstract description 2
- 238000010000 carbonizing Methods 0.000 abstract 3
- 230000004907 flux Effects 0.000 abstract 3
- 238000007670 refining Methods 0.000 abstract 2
- 229910052757 nitrogen Inorganic materials 0.000 abstract 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 14
- 229910052748 manganese Inorganic materials 0.000 description 14
- 239000011572 manganese Substances 0.000 description 14
- 230000007423 decrease Effects 0.000 description 7
- 229910000851 Alloy steel Inorganic materials 0.000 description 4
- 238000005255 carburizing Methods 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 238000005261 decarburization Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
Landscapes
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野］
本発明は、転炉でのスラグレス吹錬に好適な溶銑の予備
処理方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for pretreating hot metal suitable for slagless blowing in a converter.
【従来技術及び発明が解決しようとする課題１一般に、
転炉でスラグレス吹錬を行なう場合、溶銑を予め脱燐し
ている。この予備処理は、溶銑内に所定の媒溶剤を添加
し、かつ酸素を吹込んで脱燐をおこなうものである。こ
の脱燐では、溶銑に酸素を吹込むため、脱燐とともに脱
炭も生じ、溶銑中の炭素が０．５−０．Ｇ％程度減少し
てしまう。[Problems to be solved by the prior art and the invention 1 Generally,
When performing slagless blowing in a converter, the hot metal is dephosphorized in advance. In this preliminary treatment, a predetermined solvent is added to the hot metal and oxygen is blown into the hot metal to remove phosphorescence. In this dephosphorization, since oxygen is blown into the hot metal, decarburization occurs as well as dephosphorization, and the carbon in the hot metal is reduced to 0.5-0. It decreases by about G%.
マンガン鉱石を炉内に添加してスラグレス吹錬により合
金鋼を直接作る場合、炭素濃度が少ない溶銑を転炉に装
入すると、マンガンが熱源となって消費される傾向が高
い。この結果、マンガンの歩留が低下する問題がある。When manganese ore is added to the furnace to directly produce alloy steel by slagless blowing, if hot metal with a low carbon concentration is charged into the converter, manganese tends to be consumed as a heat source. As a result, there is a problem that the yield of manganese decreases.
本発明は、上記事情に鑑みてなされたもので、その目的
とするところは、転炉装入前の溶銑を脱燐する際に加炭
剤を添加して炭素濃度を維持することにより、転炉吹錬
時の熱源を確保し、もってスラグレス吹錬時におけるマ
ンガン歩留りの低下を阻止すること・ができる溶銑予備
処理方法を提供することにある。The present invention has been made in view of the above circumstances, and its purpose is to maintain the carbon concentration by adding a carburizing agent when dephosphorizing hot metal before charging into a converter. It is an object of the present invention to provide a hot metal pretreatment method that can secure a heat source during furnace blowing and thereby prevent a decrease in manganese yield during slagless blowing.
［課題を解決する手段、作用］
すなわち、本発明の溶銑予備処理方法は、転炉装入前の
溶銑に媒溶剤を添加し、かつ酸素を吹込んで脱燐をおこ
なった後、この溶銑を転炉に装入する溶銑の予備処理方
法において、転炉装入前の溶銑に前記媒溶剤とともに加
炭剤を添加することを特徴とする。[Means and effects for solving the problem] That is, the hot metal pretreatment method of the present invention adds a solvent to hot metal before charging into a converter, dephosphorsizes it by blowing oxygen, and then converts this hot metal. The method for pre-treating hot metal to be charged into a furnace is characterized in that a recarburizing agent is added together with the solvent to the hot metal before being charged into a converter.
この方法によれば、脱燐時の酸素吹込みで脱炭される炭
素分を補充して、転炉吹錬の熱源を確保することができ
る。そして、熱源を確保したために、マンガンが熱源と
して消費されることを阻止し、スラグレス吹錬時のマン
ガン歩留の低下を阻止することができる。According to this method, the heat source for converter blowing can be secured by replenishing the carbon content decarburized by oxygen injection during dephosphorization. Since the heat source is secured, it is possible to prevent manganese from being consumed as a heat source and prevent a decrease in manganese yield during slagless blowing.
〔実施例］ 以下、本発明を実施例に基づいて説明する。〔Example] Hereinafter, the present invention will be explained based on examples.
第１図は本発明の溶銑予備処理方法を示す概略説明図で
ある。予備処理される溶銑１１（溶銑温度１３００−１
４００℃）が入った容器Ｉ２内にノズル１３（例えばノ
ズル径１Ｏ−１２ａｓφ）を挿入し、ここから窒素ガス
等とともに所定の媒溶剤及び加炭剤を吹込む。また同時
に別のランス１４から溶銑表面に酸素を吹込む。上記媒
溶剤は、ＣａＯ系などが使用可能である。加炭剤は低硫
黄のコークス粉末、土壌黒鉛等が好適である。加炭剤の
添加量は、予備製録の操業条件、溶銑中の成分、濃度等
によって異なるが、一般的には、溶銑ｌトン当り５ｋｇ
程度吹込む。そして媒溶剤の添加と酸素の吹込みにより
脱燐をおこない、吹込まれたアルゴンガス等で溶銑を攪
拌して脱燐反応を促進する。一方、酸素吹込みにより、
溶銑中の炭素が消費されるが、予め加炭剤が添加しであ
るので炭素濃度は低下しない。FIG. 1 is a schematic explanatory diagram showing the hot metal pretreatment method of the present invention. Hot metal 11 to be pretreated (hot metal temperature 1300-1
A nozzle 13 (for example, a nozzle diameter of 10-12 asφ) is inserted into a container I2 containing a temperature of 400° C., and a predetermined solvent and carburizing agent are blown therein along with nitrogen gas and the like. At the same time, oxygen is blown into the surface of the hot metal from another lance 14. As the above-mentioned solvent, CaO type etc. can be used. As the carburizing agent, low sulfur coke powder, soil graphite, etc. are suitable. The amount of recarburizing agent added varies depending on the operating conditions of the preliminary production, the components in the hot metal, the concentration, etc., but in general, it is 5 kg per ton of hot metal.
Infuse to a certain degree. Then, dephosphorization is performed by adding a solvent and blowing oxygen, and the hot metal is stirred with blown argon gas or the like to promote the dephosphorization reaction. On the other hand, by oxygen injection,
Although the carbon in the hot metal is consumed, the carbon concentration does not decrease because the recarburizing agent is added in advance.
例えば、炭素濃度４．６％、１３００℃の溶銑を本発明
方法により予備処理したところ、炭素濃度は４，５％と
なった。For example, when hot metal with a carbon concentration of 4.6% and a temperature of 1300° C. was pretreated by the method of the present invention, the carbon concentration became 4.5%.
つぎにこのように予備処理された溶銑を転炉内に入れ、
またマンガン鉱石を炉内に添加して、レススラグ吹錬に
より合金鋼を直接作った。この処理では、炭素成分が熱
源となるため、マンガンの歩留低下を阻止することがで
きた。例えば、予備処理後の溶銑中の炭素濃度が４．５
％であったのが、転炉吹錬後の炭素濃度は０．１％であ
り、溶銑１ トン当りマンガン鉱石を２６ｋｇ添加する
ことにより、マンガン濃度１．２９６の合金鋼を製造す
ることができた。Next, the hot metal that has been pretreated in this way is put into a converter,
In addition, manganese ore was added to the furnace and alloy steel was directly produced by less slag blowing. In this treatment, since the carbon component served as a heat source, it was possible to prevent a decrease in manganese yield. For example, the carbon concentration in hot metal after pretreatment is 4.5
%, but the carbon concentration after converter blowing is 0.1%, and by adding 26 kg of manganese ore per ton of hot metal, alloy steel with a manganese concentration of 1.296 can be produced. Ta.
一方、加炭剤を添加しなかった溶銑をスラグレス吹錬し
た場合、予備処理後の溶銑中の炭素濃度が４．０％であ
ったのが、転炉吹錬後の炭素濃度は０．１％とすると、
溶銑１トン当りマンガン鉱石は１８ｋｇＬか添加できず
、製造することができる合金鋼のマンガン濃度は０．９
％までであった。On the other hand, when hot metal without a recarburizing agent was subjected to slagless blowing, the carbon concentration in the hot metal after pretreatment was 4.0%, but after converter blowing, the carbon concentration was 0.1%. If it is %,
Only 18 kgL of manganese ore can be added per ton of hot metal, and the manganese concentration in the alloy steel that can be produced is 0.9.
It was up to %.
〔発明の効果］
以上説明したように転炉装入前の溶銑の炭素１度が低下
しないように予備処理時に加炭剤を添加しておくことに
より、転炉製錬時に炭素を熱源として消費し、マンガン
を熱源として消費することを阻止するので、マンガン歩
留りを維持することができる顕著な効果を発揮する。[Effect of the invention] As explained above, by adding a recarburizing agent during preliminary treatment so that the carbon content of hot metal before charging into a converter does not decrease, carbon can be consumed as a heat source during converter smelting. However, since it prevents manganese from being consumed as a heat source, it exhibits a remarkable effect of maintaining manganese yield.
第１図は本発明にがかる溶銑予備処理方法の一例を示す
説明図である。
１１・・・ｆａａ％１２・・・容器、１３・・・ノズル
、１４・・・ノズル。
出願人代理人 弁理士 鈴江武彦
第１図FIG. 1 is an explanatory diagram showing an example of a hot metal pretreatment method according to the present invention. 11... faa% 12... Container, 13... Nozzle, 14... Nozzle. Applicant's agent Patent attorney Takehiko Suzue Figure 1
Claims (1)
で脱燐をおこなった後、この溶銑を転炉に装入する溶銑
の予備処理方法において、転炉装入前の溶銑に前記媒溶
剤とともに加炭剤を添加することを特徴とする溶銑の予
備処理方法。In a hot metal pretreatment method in which a solvent is added to hot metal before charging into a converter and oxygen is blown in to perform dephosphorization, the hot metal is charged into a converter. A method for pre-treatment of hot metal, characterized in that a recarburizing agent is added together with the solvent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11767389A JPH02298208A (en) | 1989-05-11 | 1989-05-11 | Method for pre-treating molten iron |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11767389A JPH02298208A (en) | 1989-05-11 | 1989-05-11 | Method for pre-treating molten iron |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02298208A true JPH02298208A (en) | 1990-12-10 |
Family
ID=14717457
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11767389A Pending JPH02298208A (en) | 1989-05-11 | 1989-05-11 | Method for pre-treating molten iron |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02298208A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100862798B1 (en) * | 2002-09-04 | 2008-10-13 | 주식회사 포스코 | Method for Pretreatment Hot Metal Improving Desulfuration Effiency |
-
1989
- 1989-05-11 JP JP11767389A patent/JPH02298208A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100862798B1 (en) * | 2002-09-04 | 2008-10-13 | 주식회사 포스코 | Method for Pretreatment Hot Metal Improving Desulfuration Effiency |
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